Note: Descriptions are shown in the official language in which they were submitted.
CA 02881694 2016-08-16
CHAIR BACK MECHANISM AND CONTROL ASSEMBLY
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a chair back mechanism and related
control
assembly for a chair assembly, and in particular to a reclinable back with a
flexible back
support assembly and a flexible lumbar region, and a control assembly for
manipulating
and controlling components of the chair back mechanism.
BRIEF SUMMARY OF THE INVENTION
[0002] One aspect of the present invention is to provide a chair assembly
that comprises
a first chair structure, a second chair structure movable relative to the
first chair
structure between a first position and a second position, an actuator assembly
operably
coupled to the second chair structure and adapted to move the second chair
structure
between the first and second positions, wherein at least a portion of the
actuator
assembly travels in a first direction as the chair structure is moved from the
first position
to the second position, and a control input assembly operably coupled to the
first chair
structure, wherein at least a portion of the control input assembly may be
actuated by a
seated user. The chair assembly further comprises a control link assembly
operably
coupling the control input assembly with the actuator assembly to move the
second chair
structure between the first and second positions upon an input by a seated
user to a
control input assembly, wherein the control link assembly comprises a first
shaft having a
first end operably coupled to the control link, and a second end, wherein the
first shaft is
rotatable about a first axis, a second shaft having a first end, and a second
end operably
coupled to the actuator assembly, wherein the second shaft is rotatable about
a second
axis that is substantially orthogonal to the first axis and to the first
direction, and a first
universal joint assembly and a second universal joint assembly each operably
coupling
the second end of the first shaft member to the first end of the second shaft
member
wherein actuation of the control input by a seated user moves the second chair
structure
between the first and second positions.
[0003] Another aspect of the present invention is to provide a chair
assembly that
comprises a seat. support structure, a back support structure movable between
an
= upright position and a reclined position, a back tensioning assembly that
biases the back
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assembly from the reclined position towards the upright position, the back
tensioning
assembly being adjustable between a low-tension position, wherein the back
tensioning
assembly applies a first biasing force to the back assembly, and a high-
tension position,
wherein the back tensioning assembly applies a second biasing force to the
back
assembly, and wherein the second biasing force is substantially greater than
the first
biasing force, and an actuator assembly operably coupled to the back
tensioning
assembly and adapted to adjust the back tensioning assembly between the low-
tension
and high-tension positions. The chair assembly further comprises a control
input
assembly operably coupled to the seat support structure, wherein at least a
portion of
the control assembly may be actuated by a seated user, and a control link
assembly
operably coupling the control input assembly with the actuator assembly to
adjust the
back tensioning assembly between the low-tension and high-tension positions
upon an
input by a seated user to the control input assembly. The control link
assembly
comprises a first shaft having a first end and a second end, a first universal
joint assembly
coupling the first end of the first shaft to the control input assembly, a
second shaft
having a first end and a second end, a third universal joint and a fourth
universal joint
each coupling the second end of the first shaft with the first end of the
second shaft and
a fourth universal joint coupling the second end of the second shaft with the
actuator
assembly, wherein actuation of the control input by a seated user adjusts the
back
tensioning assembly between the low-tension and high-tension positions.
[0004] Another aspect of the present invention is to provide a chair
assembly that
comprises a seat support structure, a back support structure movable between
an
upright position and a reclined position, and a back tensioning assembly that
biases the
back assembly from the reclined position towards the upright position, wherein
the back
tensioning assembly is adjustable between a low-tension position, wherein the
back
tensioning assembly applies a first biasing force to the back assembly, and a
high-tension
position, wherein the back tensioning assembly applies a second biasing force
to the back
assembly, and wherein the second biasing force is substantially greater than
the first
biasing force. The chair assembly further comprises an actuator assembly
operably
coupled to the back tensioning assembly and adapted to adjust the back
tensioning
assembly between the low-tension and high-tension positions, a control input
assembly
operably coupled to the seat support structure, wherein at least a portion of
the control
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input assembly may be actuated by a seated user by rotating the portion of the
control
input assembly, and a control link assembly operably coupling the control
input assembly
with the actuator assembly to adjust the back tensioning assembly between the
low-
tension and high-tension positions upon rotation of the portion of the control
assembly
by a seated user, wherein a number of rotations of the portion of the control
input
assembly is not limited by the control link.
[0005] Another aspect of the present invention is to provide a chair
assembly that
comprises a first chair structure, a second chair structure movable relative
to the first
chair structure between a first position and a second position, an actuator
assembly
operably coupled to the second chair structure and adapted to move the second
chair
structure between the first and second positions, and a control input assembly
operably
coupled to the first chair structure, wherein at least a portion of the
control input
assembly may be actuated by a seated user. The chair assembly further
comprises a
control link assembly operably coupling the control link assembly with the
actuator
assembly to move the second chair structure between the first and second
positions
upon an input by.a seated user to the control input assembly, and a damper
structure
operably coupled to at least a select one of the actuator assembly, the
control assembly
and the control link assembly, wherein the damper structure dampens at least a
select
one of a relative rotational movement and a relative linear movement between
at least a
select two of the actuator assembly, the control input assembly and the
control link
assembly.
[0006] Another aspect of the present invention is to provide a chair
assembly that
comprises a seat support structure operably coupled to the base structure,
wherein the
seat support structure is adapted to support a seated user thereon, a back
support
structure operably coupled to the base structure, wherein the back support
structure is
adapted to move between an upright position and a reclined position, and at
least one
biasing assembly exerting a biasing force that biases the back support
structure from the
reclined position towards the upright position, wherein the biasing force is
adjustable
between first and second magnitudes when the back support structure is in the
upright
position, and wherein the second magnitude is greater than the first
magnitude. The
chair assembly further comprises an adjustment assembly operably coupled to
the at
least one biasing assembly allowing a seated user to adjust the biasing force
between the
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first and second magnitudes, wherein the adjustment assembly adjusts the at
least one
biasing assembly between a first configuration corresponding to the first
magnitude of
the biasing force and a second configuration corresponding to the second
magnitude of
the biasing force, and an assist feature exerting an assist force on the
biasing assembly,
thereby reducing an input force required to be applied by a user to adjust the
biasing
force of the second magnitude to the first magnitude.
[0007] These and other features, advantages, and objects of the present
invention will
be further understood and appreciated by those skilled in the art by reference
to the
following specification, claims, and appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Fig. 1 is a front perspective view of a chair assembly embodying the
present
invention;
[0009] Fig. 2 is a rear perspective view of the chair assembly;
[0010] Fig. 3 is a side elevational view of the chair assembly showing the
chair assembly
in a lowered position and in a raised position in dashed line, and a seat
assembly in a
retracted position and an extended position in dashed line;
[0011] Fig. 4 is a side elevational view of the chair assembly showing the
chair assembly
in an upright position and in a reclined position in dashed line;
[0012] Fig. 5A is an exploded view of the seat assembly;
[0013] Fig. 5B is an enlarged perspective view of the chair assembly with a
portion of the
seat assembly removed to illustrate a spring support assembly;
[0014] Fig. 6 is an exploded perspective view of the seat assembly;
[0015] Fig. 7 is a top perspective view of the seat assembly;
[0016] Fig. 8 is a bottom perspective view of the seat assembly;
[0017] Fig. 9 is an exploded bottom perspective view of the cover assembly
and the seat
assembly;
[0018] Fig. 10 is a cross-sectional view of the cover assembly;
[0019] Fig. 11 is an exploded perspective view of an alternative embodiment
of the seat
assembly;
[0020] Fig. 11A is an exploded perspective view of another alternative
embodiment of
the seat assembly;
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[0021] Fig. 12 is a top perspective view of the alternative embodiment of
the seat
assembly;
[0022] Fig. 13 is a bottom perspective view of the alternative embodiment
of the seat
assembly;
[0023] Fig. 14 is an exploded bottom perspective view of the alternative
embodiment of
the seat assembly;
[0024] Fig. 15 is a top perspective view of a second alternative embodiment
of the seat
assembly;
[0025] Fig. 16 is a cross-sectional view of the second alternative
embodiment of the seat
assembly taken along the line XVI-XVI, Fig. 15;
[0026] Fig. 17 is a cross-sectional view of the second alternative
embodiment of the seat
assembly taken along the line XVII-XVII, Fig. 15;
[0027] Fig. 18 is a front perspective view of a back assembly;
[0028] Fig. 19 is a side elevational view of the back assembly;
[0029] Fig. 20A is an exploded front perspective view of the back assembly;
[0030] Fig. 2013 is an exploded rear perspective view of the back assembly;
[0031] Fig. 21 is an enlarged perspective view of an area XXI, Fig. 20A;
[0032] Fig. 22 is an enlarged perspective view of an area XXII, Fig. 2;
[0033] Fig. 23 is a cross-sectional view of an upper back pivot assembly
taken along the
line XXIII-XXIII, Fig. 18;
[0034] Fig. 24A is an exploded rear perspective view of the upper back
pivot assembly;
[0035] Fig. 248 is an exploded front perspective view of the upper back
pivot assembly;
[0036] Fig. 25 is an enlarged perspective view of the area XXV, Fig. 2013;
[0037] Fig. 26A is an enlarged perspective view of a comfort member and a
lumbar
assembly;
[0038] Fig. 268 is a rear perspective view of the comfort member and the
lumbar
assembly;
[0039] Fig. 27A is a front perspective view of a pawl member;
[0040] Fig. 278 is a rear perspective view of the pawl member;
[0041] Fig. 28 is a partial cross-sectional perspective view along the line
XXVIII-XXVIII, Fig.
2613;
[0042] Fig. 29A is a perspective view of the back assembly, wherein a
portion of the
comfort member is cut away;
[0043] Fig. 29B is an enlarged perspective view of a portion of the back
assembly;
[0044] Fig. 30 is a perspective view of an alternative embodiment of the
lumbar
assembly;
[0045] Fig. 31 is a cross-sectional view of the back assembly and an
upholstery assembly;
[0046] Figs. 32A-32D are stepped assembly views of the back assembly and
the
upholstery assembly;
[0047] Fig. 33 is an enlarged perspective view of the area XXXIII, Fig.
32A;
[0048] Figs. 34A-34H are a series of back elevational views of a boat cleat
and the
sequential steps of a drawstring secured thereto;
[0049] Figs. 35A and 35B are alternative sequential steps for securing the
drawstring to
the boat cleat;
[0050] Fig. 36 is an exploded view of an alternative embodiment of the back
assembly;
[0051] Fig. 37 is a cross-sectional side view of a top portion of the
alternative
embodiment of the back assembly;
[0052] Fig. 38 is a cross-sectional side view of a side portion of the
alternative
embodiment of the back assembly;
[0053] Fig. 39 is a front elevational view of a stay member;
[0054] Fig. 40 is a front elevational view of the stay member in an inside-
out orientation;
[0055] Fig. 41 is a partial front elevational view of the stay member sewn
to a cover
member;
[0056] Fig. 42 is a perspective view of a control input assembly supporting
a seat support
plate thereon;
[0057] Fig. 43 is a perspective view of the control input assembly with
certain elements
removed to show the interior thereof;
[0058] Fig. 44 is an exploded view of the control input assembly;
[0059] Fig. 45 is a side elevational view of the control input assembly;
[0060] Fig. 46A is a front perspective view of a back support structure;
[0061] Fig. 46B is an exploded perspective view of the back support
structure;
[0062] Fig. 47 is a side elevational view of the chair assembly
illustrating multiple pivot
points thereof;
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[0063] Fig. 48 is a side perspective view of the control assembly showing
multiple pivot
points associated therewith;
[0064] Fig. 49 is a cross-sectional view of the chair showing the back in
an upright
position with the lumbar adjustment set at a neutral setting;
[0065] Fig. 50 is a cross-sectional view of the chair showing the back in
an upright
position with the lumbar portion adjusted to a flat configuration;
[0066] Fig. 51 is a cross-sectional view of the chair showing the back
reclined with the
lumbar adjusted to a neutral position;
[0067] Fig. 52 is a cross-sectional view of the chair in a reclined
position with the lumbar
adjusted to a flat configuration;
[0068] Fig. 52A is a cross-sectional view of the chair showing the back
reclined with the
lumbar portion of the shell set at a maximum curvature;
[0069] Fig. 53 is an exploded view of a moment arm shift assembly;
[0070] Fig. 54 is a cross-sectional perspective view of the moment arm
shift assembly
taken along the line LIV¨LIV, Fig. 43;
[0071] Fig. 55 is a top plan view of a plurality of control linkages;
[0072] Fig. 56 is an exploded view of a control link assembly;
[0073] Fig. 57A is a side perspective view of the control assembly with the
moment arm
shift in a low tension position and the chair assembly in an upright position;
[0074] Fig. 57B is a side perspective view of the control assembly with the
moment arm
shift in a low tension position and the chair assembly in a reclined position;
[0075] Fig. 58A is a side perspective view of the control assembly with the
moment arm
shift in a high tension position and the chair assembly in an upright
position;
[0076] Fig. 58B is a side perspective view of the control assembly with the
moment arm
shift in a high tension position and the chair assembly in a reclined
position;
[0077] Fig. 59 is a chart of torque vs. amount of recline for low and high
tension settings;
[0078] Fig. 60 is a perspective view of a direct drive assembly with the
seat support plate
exploded therefrom;
[0079] Fig. 61 is an exploded perspective view of the direct drive
assembly;
[0080] Fig. 62 is a perspective view of a vertical height control assembly;
[0081] Fig. 63 is a perspective view of the vertical height control
assembly;
[0084 Fig. 64 is a side elevational view of the vertical height control
assembly;
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[0083] Fig. 65 is a cross-sectional perspective view of a first input
control assembly taken
along the line LXV-LXV, Fig. 42;
[0084] Fig. 66A is an exploded perspective view of a control input
assembly;
[0085] Fig. 66B is an enlarged perspective view of a clutch member of a
first control input
assembly;
[0086] Fig. 66C is an exploded perspective view of the control input
assembly;
[0087] Fig. 67 is a cross-sectional side elevational view of a variable
back control
assembly taken along the line LXVII-LXVII, Fig. 42;
[0088] Fig. 68 is a perspective view of an arm assembly;
[0089] Fig. 69 is an exploded perspective view of the arm assembly;
[0090] Fig. 70 is a side elevational view of the arm assembly in an
elevated position and a
lowered position in dashed line;
[0091] Fig. 71 is a partial cross-sectional view of the arm assembly;
[0092] Fig. 72 is a top plan view of the chair assembly showing the arm
assembly in an in-
line position and angled positions in dashed line;
[0093] Fig. 73 is a perspective view of an arm assembly including a
vertical height
adjustment lock;
[0094] Fig. 74 is a side elevational view of an arm assembly including a
vertical height
adjustment lock;
[0095] Fig. 75 is a perspective view of an arm assembly including a
vertical height
adjustment lock;
[0096] Fig. 76 is a top plan view of the chair assembly showing an arm rest
assembly in
an in-line position and rotated positions in dashed line, and in a retracted
position and an
extended position in dashed line;
[0097] Fig. 77 is an exploded perspective view of the arm rest assembly;
[0098] Fig. 78 is a cross-sectional view of the arm rest assembly taken
along the line
LXXVIII-LXXVIII, Fig. 70;
[0099] Fig. 79 is a perspective view of a chair assembly;
[00100] Fig. 80 is a front elevational view of the chair assembly as shown
in Fig. 79;
[00101] Fig. 81 is a first side elevational view of the chair assembly as
shown in Fig. 79;
[00102] Fig. 82 is a second side elevational view of the chair assembly as
shown in Fig. 79;
[00103] Fig. 83 is a rear side elevational view of the chair assembly as
shown in Fig. 79;
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[00104] Fig. 84 is a top plan view of the chair assembly as shown in
Fig. 79;
[00105] Fig. 85 is a 'bottom plan view of the chair assembly as shown
in Fig. 79;
[00106] Fig. 86 is a perspective view of a chair assembly without an
arm rest assembly;
[00107] Fig. 87 is a front elevational view of the chair assembly as
shown in Fig. 86;
[00108] Fig. 88 is a first side elevational view of the chair assembly
as shown in Fig. 86;
=
[00109] Fig. 89 is a second side elevational view of the chair
assembly as shown in Fig. 86;
[00110] Fig. 90 is a rear side elevational view of the chair assembly
as shown in Fig. 86;
[00111] Fig. 91 is atop plan view of the chair assembly as shown in
Fig. 86; and
[00112] Fig. 92 is a bottom plan view of the chair assembly as shown
in Fig. 86.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[00113] For purposes of description herein, the terms "upper,"
"lower," "right," "left,"
"rear," "front," "vertical," "horizontal," and derivatives thereof shall
relate to the
invention as oriented in Fig. 1. However, it is to be understood that the
invention may
= assume various alternative orientations and step sequences, except where
expressly
specified to the contrary. It is also to be understood that the specific
devices and
processes illustrated in the attached drawings, and described in the following
specification are exemplary embodiments of the inventive concepts. Hence,
specific
dimensions and other physical characteristics relating to the embodiments
disclosed
herein are not to be considered as limiting, unless the claims expressly state
otherwise.
Various elements of the embodiments disclosed herein may be described as being
operably coupled to one another, which includes elements either directly or
indirectly
coupled to one another. Further, the term "chair" as utilized herein
encompasses
various seating arrangements of office chairs, vehicle seating, home seating,
stadium
seating, theater seating, and the like.
[00114] The reference numeral 10 (Figs. 1 and 2) generally designates
a chair assembly
. embodying the present invention. In the illustrated example, the
chair assembly 10
includes a castered base assembly 12 abutting a supporting floor surface 13, a
control or
support assembly 14 supported by the castered base assembly 12, a seat
assembly 16
and back assembly 18 each operably coupled with the control assembly 14, and a
pair of
arm assemblies 20. The control assembly 14 (Fig. 3) is operably coupled to the
base
assembly 12 such that the seat assembly 16, the back assembly 18 and the arm
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assemblies 20 may be vertically adjusted between a fully lowered position A
and a fully
raised position B, and pivoted about a vertical axis 21 in a direction 22. The
seat
assembly 16 is operably coupled to the control assembly 14 such that the seat
assembly
16 is longitudinally adjustable with respect to the control assembly 14
between a fully
retracted position C and a fully extended position D. The seat assembly 16
(Fig. 4) and
the back assembly 18 are operably coupled with the control assembly 14 and
with one
another such that the back assembly 18 is movable between a fully upright
position E and
a fully reclined position F, and further such that the seat assembly 16 is
movable between
a fully upright position G and a fully reclined position H corresponding to
the fully upright
position E and the fully reclined position F of the back assembly 18,
respectively.
[00115] The base assembly 12 includes a plurality of pedestal arms 24
radially extending
and spaced about a hollow central column 26 that receives a pneumatic cylinder
28
therein. Each pedestal arm 24 is supported above the floor surface 13 by an
associated
caster assembly 30. Although the base assembly 12 is illustrated as including
a multiple-
arm pedestal assembly, it is noted that other suitable supporting structures
may be
utilized, including but not limited to fixed columns, multiple leg
arrangements, vehicle
seat support assemblies, stadium seating arrangements, home seating
arrangements,
theater seating arrangements, and the like.
1001161 The seat assembly 16 (Fig. 5A) includes a relatively rigid seat
support plate 32
having a forward edge 34, a rearward edge 36, and a pair of C-shaped guide
rails 38
defining the side edges of the seat support plate 32 (Fig. 5B) and extending
between the
forward edge 34 and the rearward edge 36. The seat assembly 16 further
includes a
flexibly resilient outer seat shell 40 having a pair of upwardly turned side
portions 42 and
an upwardly turhed rear portion 44 that cooperate to form an upwardly disposed
generally concave shape, and a forward edge 45. In the illustrated example,
the seat
shell 40 is comprised of a relatively flexible material such as a
thermoplastic elastomer
(TPE). In assembly, the outer seat shell 40 is secured and sandwiched between
the seat
support plate 32 and a plastic, flexibly resilient seat pan 46 which is
secured to the seat
support plate 32 by a plurality of mechanical fasteners. The seat pan 46
includes a
forward edge 48, a rearward edge 50, side edges 52 extending between the
forward edge
48 and the rearward edge 50, and a top surface 54 and a bottom surface 56 that
cooperate to form an upwardly disposed generally concave shape. In the
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example, the seat pan 46 includes a plurality of longitudinally extending
slots 58
extending forwardly from the rearward edge 50. The slots 58 cooperate to
define a
plurality of fingers 60 therebetween, each finger 60 being individually
flexibly resilient.
The seat pan 46 further includes a plurality of laterally oriented, elongated
apertures 62
located proximate the forward edge 48. The apertures 62 cooperate to increase
the
overall flexibility of the seat pan 46 in the area thereof, and specifically
allow a forward
portion 64 of the seat pan 46 to flex in a vertical direction 66 with respect
to a rearward
portion 68 of the seat pan 46, as discussed further below. The seat assembly
16 further
includes a foam cushion member 70 having an upper surface 76, and that rests
upon the
top surface 54 of the seat pan 46 and is cradled within the outer seat shell
40. The seat
assembly 16 further includes a fabric seat cover 72 having a forward edge 73,
a rearward
edge 75, and a pair of side edges 77 extending between the forward edge 73 and
rearward edge 75. A spring support assembly 78 (Figs. 5A and 5B) is secured to
the seat
assembly 16 and is adapted to flexibly support the forward portion 64 of the
seat pan 46
for flexure in the vertical direction 66. In the illustrated example, the
spring support
assembly 78 includes a support housing 80 comprising a foam and having side
portions
82 defining an upwardly concave arcuate shape. The spring support assembly 78
further
includes a relatively rigid attachment member 84 that extends laterally
between the side
portions 82 of the support housing 80 and is located between the support
housing 80
and the forward portion 64 of the seat pan 46. A plurality of mechanical
fasteners 86
secure the support housing 80 and the attachment member 84 to the forward
portion 64
of the seat pan 46. The spring support assembly 78 further includes a pair of
cantilever
springs 88 each having a distal end 90 received through a corresponding
aperture 92 of
the attachment member 84, and a proximate end 94 secured to the seat support
plate 32
such that the distal end 90 of each cantilever spring 88 may flex in the
vertical direction
66. A pair of linear bearings 96 are fixedly attached to the attachment member
84 and
aligned with the apertures 92 thereof, such that each linear bearing 96
slidably receives
the distal end 90 of a corresponding cantilever spring 88. In operation, the
cantilever
springs 88 cooperate to allow the forward portion 64 of the seat pan 46, and
more
generally the entire forward portion of seat assembly 16 to flex in the
vertical direction
66 when a seated user rotates forward on the seat assembly 16 and exerts a
downward
force on the forward edge thereof.
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[00117] The reference numeral 16a (Fig. 6) generally designates another
embodiment of
the seat assembly of the present invention. Since the seat assembly 16a is
similar to the
previously described seat assembly 16, similar parts appearing in Figs. 5A and
Figs. 6-10,
respectively are represented by the same, corresponding reference numeral,
except for
the suffix "a" in the numerals of the latter in the illustrated example. The
seat assembly
16a includes a relatively rigid seat support plate 32a having a forward edge
34a, a
rearward edge 36a, and a pair of C-shaped guide rails 38a defining the side
edges of the
seat support plate 32a and extending between the forward edge 34a and the
rearward
edge 36a. The seat assembly 16a further includes a flexibly resilient outer
seat shell 40a
(Figs. 6 and 7) having a pair of upwardly turned side portions 42a each
terminating in a
side edge 43a, a forward edge 45a, and an upwardly turned rear portion 44a
that
terminates in a rear edge 47a and includes a flap portion 49a, wherein the
side portions
42a and rear portion 44a cooperate to form a three-dimensional upwardly
disposed
generally concave shape. The seat shell 40a is comprised of a relatively
flexible material
such as a thermoplastic elastomer (TPE) and is molded as a single integral
piece. In
assembly, described in further detail below, the outer seat shell 40a is
secured and
sandwiched between the seat support plate 32a and a plastic, flexibly
resilient seat pan
46a which is secured to the seat support plate 32a by a plurality of
mechanical fasteners.
The seat pan 46a includes a forward edge 48a, a rearward edge 50a, side edges
52a
extending between the forward edge 48a and the rearward edge 50a, a top
surface 54a
and a bottom surface 56a that cooperate to form an upwardly disposed generally
concave shape. In the illustrated example, the seat pan 46a includes a
plurality of
longitudinally extending slots 58a extending forwardly from the rearward edge
50a. The
slots 58a cooperate to define a plurality of fingers 60a therebetween, each
finger 60a
being individually flexibly resilient. The seat pan 46a further includes a
plurality of
laterally oriented, elongated apertures 62a located proximate the forward edge
48a. The
apertures 62a cooperate to increase the overall flexibility of the seat pan
46a in the area
thereof, and specifically allow a forward portion 64a of the seat pan 46a to
flex in a
vertical direction 66a with respect to a rearward portion 68a of the seat pan
46a, as
discussed further below. The seat assembly 16a further includes a foam cushion
member
70a having an upper surface 76a, and that rests upon the top surface 54a of
the seat pan
46a and is cradled within the outer seat shell 40a. The seat assembly 16a
further includes
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a fabric seat cover 72a having a forward edge 73a, a rearward edge 75a and a
pair of side
edges 77a extending therebetween. The seat assembly 16a is supported by a
spring
support assembly 78a (Fig. 6) that is similar in construction and operation as
the
previously described spring support assembly 78.
[00118] As best illustrated in Figs. 7 and 8, the flexible resilient seat
shell 40a and the
fabric seat cover 72a cooperate to form an upholstery cover assembly or cover
100a.
Specifically, the side edges 43a of the seat shell 40a and the side edges 77a
of the seat
cover 72a, the forward edge 45a of the seat shell 40a and the forward edge 73a
of the
seat cover 72a, and the rear edge 47a of the seat shell 40a and the rear edge
75a of the
seat cover 72a are respectively attached to one another to form the cover 100a
and to
define an interior space 102a therein.
[00119] The flap portion 49a of the seat shell 40a includes a pair of
corner edges 104a
each extending along a corner 106a of the seat shell 40a located between the
rear
portion 44a and respective side portions 42a, such that the flap portion 49a
is movable
between an open position I and a closed position J. In the illustrated
example, each
corner edge 104a of the flap portion 49a includes a plurality of tabs 108a
spaced along
the corner edge 104a and each including an aperture 110a extending
therethrough. The
tabs 108a of the corner edge 104a are interspaced with a plurality of tabs
112a spaced
along a corner edge 114a of each side portion 42a. Each of the tabs 112a
includes an
aperture 116a that extends therethrough. The seat shell 40a also includes a
plurality of
integrally-molded coupling tabs 118a spaced about an inner edge 121a of the
seat shell
40a and each having a Z-shaped, cross-section configuration.
[00120] In assembly, the upholstery cover assembly 100a (Fig. 9) is
constructed from the
seat shell 40a and seat cover 72a as described above. The seat pan 46a, the
cushion
member 70a and the spring support assembly 78a are then arranged with respect
to one
another assembled with the upholstery cover assembly 100a by positioning the
flap 49a
in the open position I, positioning the seat pan 46a, the cushion member 70a
and spring
support assembly 78a within the interior space 102a, and then moving the flap
49a to the
closed position J. A pair of quick-connect fasteners 120a each include a
plurality of snap
couplers 122a spaced along the length of an L-shaped body portion 124a. In
assembly,
the snap couplers 122a are extended through the apertures 110a, 116a of the
tabs 108a,
112a, and are snapably received within corresponding apertures 126a of the
seat pan
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46a, thereby securing the corner edges 104a, 114a to the seat pan 46a and the
flap
portion 49a in the closed position J.
[00121] Further in assembly, the coupling tabs 118a (Fig. 10) are
positioned within
corresponding apertures 130a of the seat pan 46a, such that the cover assembly
100a is
temporarily secured to the seat pan 46a, thereby allowing further manipulation
of the
cover seat assembly 16a during assembly while maintaining connection and
alignment of
the cover assembly 100a with the seat pan 46a. As used herein, "temporarily
securing" is
defined as a securing not expected to maintain the securement of the cover
assembly
100a to the seat pan 46a by itself during normal use of the chair assembly
throughout
the normal useful life of the chair assembly. The support plate 32a is then
secured to an
underside of the seat pan 46a by a plurality of screws 132a, thereby
sandwiching the
coupling tabs 118a between the support plate 32a and the seat pan 46a, and
permanently securing the cover assembly 100a to the seat pan 46a. As used
herein,
"permanently securing" is defined as a securing expected to maintain the
securement of
the cover assembly to the seat pan 46a during normal use of the chair assembly
throughout the normal useful life of the chair assembly.
[00122] The reference numeral 16b (Fig. 11) generally designates another
embodiment of
the seat assembly. Since the seat assembly 16b is similar to the previously
described seat
assemblies 16 and/or seat assembly 16a, similar parts appearing in Figs. 5A-10
and Figs.
11-17 respectively are represented by the same, corresponding reference
numeral,
except for the suffix "b" in the numerals of the latter. In the illustrated
example, the seat
assembly 16b is similar in configuration and construction to the seat assembly
16 and the
seat assembly 16a, with the most notable exception being an alternatively,
configured
and constructed outer seat shell 40b and upholstery cover 100b.
[00123] The seat assembly 16b (Fig. 11) includes a flexibly resilient outer
seat shell 40b
having a pair of upwardly turned side portions 42b each terminating in a side
edge 43b, a
forward edge 45b, and an upwardly turned rear portion 44b that terminates in a
rear
edge 47b, wherein the side portions 42b and rear portion 44b cooperate to form
a three-
dimensional upwardly disposed generally concave shape. The seat shell 40b is
comprised
of a relatively flexible material such as a thermoplastic elastomer (TPE) and
is molded as
a single integral piece. In assembly, described in further detail below, the
outer seat shell
40b is secured and sandwiched between the seat support plate 32b, a plastic,
flexibly
14
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resilient seat pan 46b and a plastic, substantially rigid overlay 51b, each of
which is
secured to the seat support plate 32b by a plurality of mechanical fasteners.
The overlay
51b has an upwardly arcuate shape and includes a rear wall 53b and a pair of
forwardly-
extending sidewalls 55b each including a forward-most edge 57b, and wherein
the rear
wall 53b and sidewalls 55b cooperate to form an uppermost edge 59b. The seat
pan 46b
includes a forward edge 48b, a rearward edge 50b, side edges 52b extending
between
the forward edge 48b and the rearward edge 50b, a top surface 54b and a bottom
surface 56b that cooperate to form an upwardly disposed generally concave
shape.
[00124] As best illustrated in Figs. 12 and 13, the flexible resilient seat
shell 40b, the fabric
seat cover 72b and the overlay 51b cooperate to form an upholstery cover
assembly or
cover 100b. In the illustrated example, the side edges 43b of the seat shell
40b and the
side edges 77b of the seat cover 72b, the forward edge 45b of the seat shell
40b and the
forward edge 73b of the seat cover 72b, and the rear edge 47b of the seat
shell 40b and
the rear edge 75b of the seat cover 72b are respectively attached to one
another, such
that the seat shell 40b and the fabric seat cover 72b cooperate with the
overlay 51b to
form the cover 100b and to define an interior space 102b therein. The seat
shell 40b also
includes a plurality of integrally-molded coupling tabs 118b spaced about an
inner edge
121b of the seat shell 40b and each having a Z-shaped, cross-section
configuration.
[00125] In assembly, the seat shell 40b (Fig. 14) and seat cover 72b of the
upholstery
cover 100b are coupled to one another as described above. As best illustrated
in Figs. 15
and 16, the side portions 42b of the seat shell 40b are coupled to the fabric
seat cover
72b so as to define a corner 79b therebetween. It is noted that use of both
the fabric
material of the fabric seat cover 72b and the TPE of the seat shell 40b
provides a sharp
and crisp aesthetic corner angle 13 of 900 or less while simultaneously
providing a soft,
resilient deformable feel for the user. The seat pan 46b, the cushion member
70b and
the spring support assembly 78b are then arranged with respect to one another
and
positioned within the interior space 102b of the cover 100b. The shell 40b is
then
secured to the seat pan 46b for displacement in a lateral direction by a
plurality of
integral hook-shaped couplers 123b spaced about the periphery of the shell 40b
and
which engage a downwardly-extending trim portion 125b extending about the side
and
rear periphery of the seat pan 46b. The shell 40b (Fig. 17) further includes a
plurality of
Z-shaped couplers 127b integral with the shell 40b and received within
corresponding
CA 02881694 2016-08-16
apertures 129b of the seat pan 46b, thereby temporarily securing the shell 40b
to the
seat pan 46b with respect to vertical displacement.
[00126] Further in assembly, the overlay 51b (Fig. 17) includes a plurality
of integrally
formed, L-shaped hooks 131b spaced along the sidewalls 55b and that slidably
engage a
corresponding plurality of angled couplers 133b integrally formed with the
seat pan 46b.
Specifically, the hooks 131b engage the couplers 133b as the overlay 51b is
slid forwardly
with respect to the seat pan 46b. The overlay 51b is then secured in place by
a pair of
screws 135b that extend through corresponding apertures 137b of the overlay
51b and
are threadably received within corresponding bosses 139b of the seat pan 46b,
thereby
trapping the couplers 127b within the apertures 129b. The support plate 32b is
then
secured to an underside of the seat pan 46b by a plurality of screws 132b,
thereby
sandwiching a plurality of spaced coupling tabs 141b integral with the overlay
51b
between the support plate 32b and the seat pan 46b, and permanently securing
the
cover assembly 100b to the seat pan 46b. It is noted that the terms
"temporarily
securing" and "permanently securing" are previously defined herein.
[00127] The reference numeral 16b' (Fig. 11A) generally designates another
embodiment
of the seat assembly. Since the seat assembly 16b' is similar to the
previously described
seat assembly 16b, similar parts appearing in Fig. 11 and Fig. 11A
respectively are
represented by the same, corresponding reference numeral, except for the
suffix "" in
the numerals of the latter. In the illustrated example, the seat assembly 16b'
is similar in
configuration and construction to the seat assembly 16b, with the most notable
exception being an alternatively configured foam cushion member 70b'. The
cushion
member 70b' includes a first portion 81b' and a second portion 83b'. In
assembly, the
first portion 81b' of the cushion member 70b' is positioned over the seat pan
46b'. The
attachment member 8413' is secured to an underside of the seat pan 46b' by
mechanical
fasteners such as-screws (not shown). The second portion 83b' of the cushion
member
70b' is then wrapped about the front edge 48b' of the seat pan 46b' and the
attachment
member 84b', and secured to the attachment member 84b' by an adhesive. The
combination of the seat pan 46b', the cushion member 70b' and the attachment
member
84b' is assembled with the seat support plate 32b', to which the spring
members 88b' are
previously attached, and the linear bearings 96b' are attached thereto.
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[00128] The back assembly 18 (Figs. 18-20B) includes a back frame assembly
200 and a
back support assembly 202 supported thereby. The back frame assembly 200 is
generally
comprised of a substantially rigid material such as metal, and includes a
laterally
extending top frame portion 204, a laterally extending bottom frame portion
206, and a
pair of curved side frame portions 208 extending between the top frame portion
204 and
the bottom frame portion 206 and cooperating therewith to define an opening
210
having a relatively large upper dimension 212 and a relatively narrow lower
dimension
214.
[00129] The back assembly 18 further includes a flexibly resilient, plastic
back shell 216
having an upper portion 218, a lower portion 220, a pair of side edges 222
extending
between the upper portion 218 and a lower portion 220, a forwardly facing
surface 224
and a rearwardly facing surface 226, wherein the width of the upper portion
218 is
generally greater than the width of the lower portion 220, and the lower
portion 220 is
downwardly tapered to generally follow the rear elevational configuration of
the frame
assembly 200. A lower reinforcement member 228 (Fig. 29A) attaches to hooks
230 of
lower portion 220 of back shell 216. The reinforcement member 228 includes a
plurality
of protrusions 232 that engage a plurality of reinforcement ribs 250 of the
back shell 216
to prevent side-to-side movement of lower reinforcement member 228 relative to
back
shell 216, while the reinforcement member 228 pivotably interconnects back
control link
236 to lower portion 220 of back shell 216 at pivot point or axis 590, each as
described
below.
[00130] The back shell 216 also includes a plurality of integrally molded,
forwardly and
upwardly extending hooks 240 (Fig. 21) spaced about the periphery of the upper
portion
218 thereof. An intermediate or lumbar portion 242 is located vertically
between the
upper portion 218 and the lower portion 220 of the back shell 216, and
includes a
plurality of laterally extending slots 244 that cooperate to form a plurality
of laterally
extending ribs 246 located therebetween. The slots 244 cooperate to provide
additional
flexure to the back shell 216 in the location thereof. Pairings of lateral
ribs 246 are
coupled by vertically extending ribs 248 integrally formed therewith and
located at an
approximate lateral midpoint thereof. The vertical ribs 248 function to tie
the lateral ribs
246 together and reduce vertical spreading therebetween as the back shell 216
is flexed
at the intermediate portion 242 thereof when the back assembly 18 is moved
from the
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upright position E to the reclined position F, as described below. The
plurality of
laterally-spaced reinforcement ribs 250 extend longitudinally along the
vertical length of
the back shell 216 between the lower portion 220 and the intermediate portion
242. It is
noted that the depth of each of the ribs 250 increases along each of the ribs
250 from the
intermediate portion 242 toward the lower portion 220, such that the overall
rigidity of
the back shell 216 increases along the length of the ribs 250.
[00131] The back shell 216 (Figs. 20A and 20B) further includes a pair of
rearwardly
extending, integrally molded pivot bosses 252 forming part of an upper back
pivot
assembly 254. The back pivot assembly 254 (Figs. 22-24B) includes the pivot
bosses 252
of the back shell 216, a pair of shroud members 256 that encompass respective
pivot
bosses 252, a race member 258, and a mechanical fastening assembly 260. Each
pivot
boss 252 includes a pair of side walls 262 and a rearwardly-facing concave
seating surface
264 having a vertically elongated pivot slot 266 extending therethrough. Each
shroud
member 256 is shaped so as to closely house the corresponding pivot boss 252,
and
includes a plurality of side walls 268 corresponding to side walls 262, and a
rea rwardly-
facing concave bearing surface 270 that includes a vertically elongated pivot
slot 272
extending therethrough, and which is adapted to align with the slot 266 of a
corresponding pivot boss 252. The race member 258 includes a center portion
274
extending laterally along and abutting the top frame portion 204 of the back
frame
assembly 200, and a pair of arcuately-shaped bearing surfaces 276 located at
the ends
thereof. Specifically, the center portion 274 includes a first portion 278 and
a second
portion 280, wherein the first portion 278 abuts a front surface of the top
frame portion
204 and the second portion 280 abuts a top surface of the top frame portion
204. Each
bearing surface 276 includes an aperture 282 extending therethrough and which
aligns
with a corresponding boss member 284 integral with the back frame assembly
200.
[00132] In assembly, the shroud members 256 are positioned about the
corresponding
pivot bosses 252 of the back shell 216 and operably positioned between the
back shell
216 and the race member 258 such that the bearing surface 270 is sandwiched
between
the seating surface 264 of a corresponding pivot boss 252 and a bearing
surface 276. The
mechanical fastening assemblies 260 each include a bolt 286 that secures a
rounded
abutment surface 288 of a bearing washer 290 in sliding engagement with an
inner
surface 292 of the corresponding pivot boss 252, and threadably engages the
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corresponding boss member 284 of the back shell 216. In operation, the upper
back
pivot assembly 254 allows the back support assembly 202 to pivot with respect
to the
back frame assembly in a direction 294 (Fig. 19) about a pivot axis 296 (Fig.
18).
[00133] The back support assembly 202 (Figs. 20A and 20B) further includes
a flexibly
resilient comfort member 298 (Figs. 26A and 26B) attached to the back shell
216 and
slidably supporting a lumbar assembly 300. The comfort member 298 includes an
upper
portion 302, a lower portion 304, a pair of side portions 306, a forward
surface 308, and a
rearward surface 310, wherein the upper portion 302, the lower portion 304 and
the side
portions 306 cooperate to form an aperture 312 that receives the lumbar
assembly 300
therein. As best illustrated in Figs. 20B and 25, the comfort member 298
includes a
plurality of box-shaped couplers 314 spaced about the periphery of the upper
portion
302 and extending rearwardly from the rearward surface 310. Each box-shaped
coupler
314 includes a pair of side walls 316 and a top wall 318 that cooperate to
form an interior
space 320. A bar 322 extends between the side walls 316 and is spaced from the
rearward surface 310. In assembly, the comfort member 298 is secured to the
back shell
216 by aligning and vertically inserting the hooks 240 (Fig. 23) of the back
shell 216 into
the interior space 320 of each of the box-shaped couplers 314 until the hooks
240 engage
a corresponding bar 322. It is noted that the forward surface 224 of the back
shell 216
and the rearward surface 310 of the comfort member 298 are free from holes or
apertures proximate the hooks 240 and box-shaped couplers 314, thereby
providing a
smooth forward surface 308 and increasing the comfort to a seated user.
[00134] The comfort member 298 (Figs. 26A and 26B) includes an integrally
molded,
longitudinally extending sleeve 324 extending rearwardly from the rearward
surface 310
and having a rectangularly-shaped cross-sectional configuration. The lumbar
assembly
300 includes a forwardly laterally concave and forwardly vertically convex,
flexibly
resilient body portion 326, and an integral support portion 328 extending
upwardly from
the body portion 326. In the illustrated example, the body portion 326 is
shaped such
that the body portion vertically tapers along the height thereof so as to
generally follow
the contours and shape of the aperture 312 of the comfort member 298. The
support
portion 328 is slidably received within the sleeve 324 of the comfort member
298 such
that the lumbar assembly 300 is vertically adjustable with respect to the
remainder of the
back support assembly 202 between a fully lowered position I and a fully
raised position
19
CA 02881694 2016-08-16
J. A pawl member 330 selectively engages a plurality of apertures 332 spaced
along the
length of support portion 328, thereby releasably securing the lumbar assembly
300 at
selected vertical positions between the fully lowered position I and the fully
raised
position J. The pawl member 330 (Figs. 27A and 273) includes a housing portion
334
having engagemeht tabs 336 located at the ends thereof and rearwardly offset
from an
outer surface 338 of the housing portion 334. A flexibly resilient finger 340
is centrally
disposed within the housing portion 334 and includes a rearwardly-extending
pawl 342.
[00135] In assembly, the pawl member 330 (Fig. 28) is positioned within an
aperture 344
located within the upper portion 302 of the comfort member 298 such that the
outer
surface 338 of the housing portion 334 of the pawl member 330 is coplanar with
the
forward surface 308 of the comfort member 298, and such that the engagement
tabs 336
of the housing portion 334 abut the rearward surface 310 of the comfort member
298.
The support portion 328 of the lumbar assembly 300 is then positioned within
the sleeve
324 of the comfort member 298 such that the sleeve 324 is slidable therein and
the pawl
342 is selectively engageable with the apertures 332, thereby allowing the
user to
optimize the position of the lumbar assembly 300 with respect to the overall
back
support assembly. 202. Specifically, the body portion 326 of the lumbar
assembly 300
includes a pair of outwardly extending integral handle portions 346 (Figs. 29A
and 298)
each having a C-shaped cross-sectional configuration defining a channel 348
therein that
wraps about and guides along the respective side edge 222 of the back shell
216.
Alternatively, the lumbar assembly 300c (Fig. 30) is provided wherein the body
portion
326c and the support portion 328c are integrally formed, and the handles 346c
are
formed separately from the body portion 326c and are attached thereto. In the
alternative embodiment, each handle 346c includes a pair of blades 350c
received within
corresponding pockets 352c of the body portion 326c. Each blade 350c includes
a pair of
snap tabs 354c spaced along the length thereof and which snappingly engage an
edge of
one of a plurality of apertures 356c within the body portion 326c.
[00136] In operation, a user adjusts the relative vertical position of the
lumbar assembly
300, 300c with respect to the back shell 216 by grasping one or both of the
handle
= portions 346, 346c and sliding the handle assembly 346, 346c along the
comfort member
298 and the back shell 216 in a vertical direction. A stop tab 358 is
integrally formed
within a distal end 360 and is offset therefrom so as to engage an end wall of
the sleeve
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324 of the comfort member 298, thereby limiting the vertical downward travel
of the
support portion 328 of the lumbar assembly 300 with respect to the sleeve 324
of the
comfort member 298.
[00137] The back assembly 202 (Figs. 20A and 20B) further includes a
cushion member
362 having an upper portion 364 and a lower portion 366, wherein the lower
portion 366
tapers along the vertical length thereof to correspond to the overall shape
and taper of
the back shell 216 and the comfort member 298.
[00138] The back support assembly 202 further includes an upholstery cover
assembly
400 (Fig. 31) that houses the comfort member 298, the lumbar support assembly
300 and
the cushion member 362 therein. In the illustrated example, the cover assembly
400
comprises a fabric material and includes a front side 402 (Fig. 32A) and a
rear side 404
that are sewn together along the respective side edges thereof to form a first
pocket 406
having a first interior or inner space 408 that receives the comfort member
298 and the
cushion member 362 therein, and a flap portion 410 that is sewn to the rear
side 404 and
cooperates therewith to form a second pocket 412 having a second interior or
inner
space 413 (Fig. 32D) that receives the lumbar support assembly 300 therein.
[00139] In assembly, the first pocket 406 (Fig. 32A) is formed by attaching
the respective
side edges of the front side 402 and the rear side 404 to one another such as
by sewing
or other means suitable for the material for which the cover assembly 400 is
comprised,
and to define the first interior space 408. An edge of the flap portion 410 is
then secured
to a lower end of the rear side 404. In the illustrated example, the
combination of the
back shell 216 and the cushion member 362 are then inserted into the interior
space 408
of the first pocket 406 via an aperture 415 of the rear side 404 (Fig. 32B).
The upholstery
cover assembly 400 is stretched about the cushion member 362 and the comfort
member 298, and is secured to the comfort member 298 by a plurality of
apertures 420
that receive upwardly extending hook members 424 (Fig. 33) therethrough.
Alternatively, the cover assembly 400 may be configured such that apertures
420 are
positioned to also receive T-shaped attachment members 422 therethrough. In
the
illustrated example, the attachment members 422 and the hook members 424 are
integrally formed with the comfort member 298. Each attachment member 422 is
provided with a T-shaped cross-section or boat-cleat configuration having a
first portion
428 extending perpendicularly rearward from within a recess 429 of the rear
surface 310
21
of the comfort member 298, and a pair of second portions 430 located at a
distal end of
the first portion 428 and extending outwardly therefrom in opposite relation
to one
another. One of the second portions 430 cooperates with the first portion 428
to form
an angled engagement surface 432. The recess 429 defines an edge 434 about the
perimeter thereof.
[00140] The cover assembly 400 is further secured to the comfort member 298
by a
drawstring 436 that extends through a drawstring tunnel 438 of the cover
assembly 400,
and is secured to the attachment members 422. Specifically, and as best
illustrated in
Figs. 34A-34H, each free end of the drawstring 436 is secured to an associated
attachment member 422 in a knot-free manner and without the use of a
mechanical
fastener that is separate from the comfort member 298. In assembly, the
drawstring 436
and drawstring tunnel 438 guide about a plurality of guide hooks 439 (Fig.
26B) located
about a periphery of and integrally formed with the comfort member 298. The
drawstring 436 is wrapped about the associated attachment member 422 such that
the
tension in the drawstring 436 about the attachment member 422 forces the
drawstring
436 against the engagement surface 432 that angles towards the recess 429,
thereby
forcing a portion of the drawstring 436 into the recess 429 and into
engagement with at
least a portion of the edge 434 of the recess 429 resulting in an increased
frictional
engagement between the drawstring 436 and the comfort member 298. Figs. 35A
and
35B illustrate alternative paths that the drawstring 436 may take about the
attachment
member 422 relative to the steps illustrated in Figs. 34G and 34H,
respectively.
[00141] The lumbar assembly 300 (Fig. 32C) is then aligned with the
assembly of the cover
assembly 400, the cushion member 362 and the comfort member 298 such that the
body
portion 326 of the lumbar assembly 300 is located near a midsection 414 of the
cover
assembly 400, and the support portion 328 of the lumbar assembly 300 is
coupled with
the comfort member 298 as described above. The flap portion 410 (Fig. 32D) is
then
folded over the lumbar assembly 300, thereby creating a second pocket 412
having an
interior space 413. A distally located edge 442 of the flap portion 410 is
attached to the
comfort member 298 by a plurality of apertures 444 within the flap portion 410
that
receive the hooks 424 therethrough. The distal edge 442 may also be sewn to
the rear
side 404 of the cover assembly 400. In the illustrated example, the side edges
446 of the
flap portion 410 are not attached to the remainder of the cover assembly 400,
such that
22
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the side edges 446 cooperate with the remainder of the cover assembly 400 to
form slots
448 through which the handle portions 346 of the lumbar assembly 300 extend.
The
second pocket 412 is configured such that the lumbar assembly 300 is
vertically
adjustable therein. The assembly of the cover assembly 400, the cushion member
362,
the comfort member 298 and the lumbar assembly 300 are then attached to the
back
shell 216.
[00142] The reference numeral 18d (Fig. 36) generally designates an
alternative
embodiment of the back assembly. Since back assembly 18d is similar to the
previously
described back assembly 18, similar parts appearing in Figs. 20A and 20B and
Figs. 36-41
are represented respectively by the same corresponding reference numeral,
except for
the suffix "d" in the numerals of the latter. The back assembly 18d includes a
back frame
assembly 200d, a back shell 216d, and an upholstery cover assembly 400d. In
the
illustrated example, the back shell 216d includes a substantially flexible
outer peripheral
portion 450d (Figs. 37 and 38) and a substantially less flexible rear portion
452d to which
the peripheral portion 450d is attached. The rear portion 452d includes a
plurality of
laterally extending, vertically spaced slots 454d that cooperate to define
slats 456d
therebetween. The peripheral portion 450d and the rear portion 452d cooperate
to form
an outwardly facing opening 458d extending about a periphery of the back shell
216d.
The rear portion 452d includes a plurality of ribs 460d spaced about the
opening 458d
and are utilized to secure the cover assembly 400d to the back shell 216d as
described
below.
[00143] The cover assembly 400d includes a fabric cover 462d and a stay
member 464d
extending about a peripheral edge 466d of the fabric cover 462d. The fabric
cover 462d
includes a front surface 468d and a rear surface 470d and preferably comprises
a
material flexible in at least one of a longitudinal direction and a lateral
direction. As best
illustrated in Fig. 39, the stay member 464d is ring-shaped and includes a
plurality of
widened portions 472d each having a rectangularly-shaped cross-sectional
configuration
interspaced with a plurality of narrowed corner portions 474d each having a
circularly-
shaped cross-sectional configuration. Each of the widened portions 472d
includes a
plurality of apertures 476d spaced along the length thereof and adapted to
engage with
the ribs 460d of the back shell 216d, as described below. The stay member 464d
is
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comprised of a relatively flexible plastic such that the stay member 464d may
be turned
inside-out, as illustrated in Fig. 40.
[00144] In assembly, the stay member 464d is secured to the rear surface
470d of the
cover 462d such that the cover 462d is fixed for rotation with the widened
portions 472d,
and such that the cover 462d is not fixed for rotation with the narrowed
corner portions
474d along a line tangential to a longitudinal axis of the narrowed corner
portions 474d.
In the present example, the stay member 464d (Fig. 41) is sewn about the
peripheral
edge 466d of the cover 462d by a stitch pattern that extends through the
widened
portions 472d and about the narrowed corner portions 474d. The cover assembly
400d
of the cover 462d and the stay member 464d are aligned with the back shell
216d, and
the peripheral edge 466d of the cover 462d is wrapped about the back shell
216d such
that the stay member 464d is turned inside-out. The stay member 464d is then
inserted
into the opening or groove 458d, such that the tension of the fabric cover
462d being
stretched about the back shell 216d causes the stay member 464d to remain
positively
engaged within the groove 458d. The ribs 460d of the back shell 216d engage
the
corresponding apertures 476d of the stay member 464d, thereby further securing
the
stay member 464d within the groove 458d. It is noted that the stitch pattern
attaching
the cover 462d to the stay member 464d allows the narrowed corner portions
474d of
the stay member 464d to rotate freely with respect to the cover 462d, thereby
reducing
the occurrence of aesthetic anomalies near the corners of the cover 462d, such
as
bunching or over-stretch of a given fabric pattern.
[00145] The seat assembly 16 and the back assembly 18 are operably coupled
to and
controlled by the control assembly 14 (Fig. 42) and a control input assembly
500. The
control assembly 14 (Figs. 43-45) includes a housing or base structure or
ground
structure 502 that includes a front wall 504, a rear wall 506, a pair of side
walls 508 and a
bottom wall 510 integrally formed with one another and that cooperate to form
an
upwardly opening interior space 512. The bottom wall 510 includes an aperture
514
centrally disposed therein, as described below. The base structure 502 further
defines an
upper and forward pivot point 516, a lower and forward pivot point 518, and an
upper
and rearward pivot point 540, wherein the control assembly 14 further includes
a seat
support structure 522 that supports the seat assembly 16. In the illustrated
example, the
seat support structure 522 has a generally U-shaped plan form configuration
that
24
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includes a pair of forwardly extending arm portions 524 each including a
forwardly
located pivot aperture 526 pivotably secured to the base structure 502 by a
pivot shaft
528 for pivoting movement about the upper and forward pivot point 516. The
seat
support structure 522 further includes a rear portion 530 extending laterally
between the
arm portions 524 and cooperating therewith to form an interior space 532
within which
the base structure 502 is received. The rear portion 530 includes a pair of
rearwardly
extending arm mounting portions 534 to which the arm assemblies 20 are
attached as
described below. The seat support structure 522 further includes a control
input
assembly mounting portion 536 to which the control input assembly 500 is
mounted.
The seat support structure 522 further includes a pair of bushing assemblies
538 that
cooperate to define the pivot point 540.
[00146] The control assembly 14 further includes a back support structure
542 having a
generally U-shaped plan view configuration and including a pair of forwardly
extending
arm portions 544 each including a pivot aperture 546 and pivotably coupled to
the base
structure 502 by a pivot shaft 548 such that the back support structure 542
pivots about
the lower and forward pivot point 518. The back support structure 542 includes
a rear
portion 550 that cooperates with the arm portions 544 to define an interior
space 552
which receives the base structure 502 therein. The back support structure 542
further
includes a pair of pivot apertures 554 located along the length thereof and
cooperating
to define a pivot point 556. It is noted that in certain instances, at least a
portion of the
back frame assembly 200 may be included as part of the back support structure
542.
[00147] The control assembly 14 further includes a plurality of control
links 558 each
having a first end 560 pivotably coupled to the seat support structure 522 by
a pair of
pivot pins 562 for pivoting about the pivot point 540, and a second end 564
pivotably
coupled to corresponding pivot apertures 554 of the back support structure 542
by a pair
of pivot pins 566 for pivoting about the pivot point 556. In operation, the
control links
558 control the motion, and specifically the recline rate of the seat support
structure 522
with respect to the back support structure 542 as the chair assembly is moved
to the
recline position, as described below.
[00148] As best illustrated in Figs. 46A and 46B, the bottom frame portion
206 of the back
frame assembly 200 is configured to connect to the back support structure 542
via a
quick connect arrangement 568. Each arm portion 544 of the back support
structure 542
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includes a mounting aperture 570 located at a proximate end 572 thereof. In
the
illustrated example, the quick connect arrangement 568 comprises a
configuration of the
bottom frame portion 206 of the back frame assembly 200 that includes a pair
of
forwardly-extending coupler portions 574 that cooperate to define a channel
576
therebetween that receives the rear portion 550 and the proximate ends 572 of
the arm
portions 544 therein. Each coupler portion 574 includes a downwardly extending
boss
578 that aligns with and is received within a corresponding aperture 570.
Mechanical
fasteners, such as screws 580 are then threaded into the bosses 578, thereby
allowing a
quick connection of the back frame assembly 200 to the control assembly 14.
[00149] As best illustrated in Fig. 47, the base structure 502, the seat
support structure
522, the back support structure 542 and the control links 558 cooperate to
form a 4-bar
linkage assembly that supports the seat assembly 16, the back assembly 18, and
the arm
assemblies 20 (Fig. 1). For ease of reference, the associated pivot assemblies
associated
with the 4-bar linkage assembly of the control assembly 14 are referred to as
follows: the
upper and forward pivot point 516 between the base structure 502 and the base
support
structure 522 as the first pivot point 516; the lower and forward pivot point
518 between
the base structure 502 and the back support structure 542 as the second pivot
point 518;
the pivot point 540 between the first end 560 of the control link 558 and the
seat support
structure 522 as the third pivot point 540; and, the pivot point 556 between
the second
end 564 of the control link 558 and the back support structure 542 as the
fourth pivot
point 556. Further, Figure 47 illustrates the component of the chair assembly
10 shown
in a reclined position in dashed lines, wherein the reference numerals of the
chair in the
reclined position are designated with a " ' ".
[00150] In operation, the 4-bar linkage assembly of the control assembly 14
cooperates to
recline the seat assembly 16 from the upright position G to the reclined
position H as the
back assembly 18 is moved from the upright position E to the reclined position
F, wherein
the upper and lower representations of the positions E and F in Fig. 47
illustrates that the
upper and lower portions of the back assembly 18 recline as a single piece.
Specifically,
the control link 558 is configured and coupled to the seat support structure
522 and the
back support structure 542 to cause the seat support structure 522 to rotate
about the
first pivot point 516 as the back support structure 542 is pivoted about the
second pivot
point 518. Preferably, the seat support structure 522 is rotated about the
first pivot
26
CA 02881694 2016-08-16
point 516 at between about 1/3 and about 2/3 the rate of rotation of the back
support
structure 542 about the second pivot point 518, more preferably the seat
support
structure 522 rotates about the first pivot point 516 at about half the rate
of rotation of
the back support structure 542 about the second pivot point 518, and most
preferably
the seat assembly 16 reclines to an angle f3 of about 9 from the fully
upright position G
to the fully reclined position H, while the back assembly 18 reclines to an
angle y of about
18 from the fully upright position E to the fully reclined position F.
[00151] As best illustrated in Fig. 47, the first pivot point 516 is
located above and forward
of the second pivot point 518 when the chair assembly 10 is at the fully
upright position,
and when the chair assembly 10 is at the fully reclined position as the base
structure 502
remains fixed with respect to the supporting floor surface 13 as the chair
assembly 10 is
reclined. The third pivot point 540 remains behind and below the relative
vertical height
of the first pivot point 516 throughout the reclining movement of the chair
assembly 10.
It is further noted that the distance between the first pivot point 516 and
the second
pivot point 518 is greater than the distance between the third pivot point 540
and the
fourth pivot point 556 throughout the reclining movement of the chair assembly
10. As
best illustrated in Fig. 48, a longitudinally extending center line axis 582
of the control
link 558 forms an acute angle c,c with the seat support structure 522 when the
chair
assembly 10 is in the fully upright position and an acute angle ct when the
chair assembly
is in the fully reclined position. It is noted that the center line axis 582
of the control
link 558 does not rotate past an orthogonal alignment with the seat support
structure
522 as the chair assembly 10 is moved between the fully upright and fully
reclined
positions thereof.
[00152] With further reference to Fig. 49, a back control link 584 includes
a forward end
585 that is pivotably coupled or connected to the seat support structure 522
at a fifth
pivot point 586. A rearward end 588 of the back control link 584 is connected
to the
lower portion 220 of the back shell 216 at a sixth pivot point 590. The sixth
pivot point
590 is optional, and the back control link 584 and the back shell 216 may be
rigidly fixed
to one another. Also, the pivot point 590 may include a stop feature that
limits rotation
of the back control link 584 relative to the back shell 216 in a first and/or
second
rotational direction. For example, with reference to Fig. 49, the pivot point
590 may
include a stop feature 592 that permits clockwise rotation of the lower
portion 220 of the
27
CA 02881694 2016-08-16
back shell 216 relative to the control link 584. This permits the lumbar to
become flatter
if a rearward/horizontal force tending to reduce dimension D1 is applied to
the lumbar
portion of the back shell 216. However, the stop feature 592 may be configured
to
= prevent rotation of the lower portion 220 of the back shell 216 in a
counter clockwise
direction (Fig. 49) relative to the control link 584. This causes the control
link 584 and the
lower portion 220 of the back shell 216 to rotate at the same angular rate as
a user
reclines in the chair by pushing against an upper portion of back assembly 18.
[00153] A cam link 594 is also pivotably coupled or connected to the seat
support
structure 522 for rotation about the pivot point or axis 586. The cam link 594
has a
curved lower cam surface 596 that slidably engages an upwardly facing cam
surface 598
formed in the back support structure 542. A pair of torsion springs 600 (see
also Fig.
29A) rotatably bias the back control link 584 and the cam link 594 in a manner
that tends
to increase the angle 0 (Fig. 49). The torsion springs 600 generate a force
tending to
rotate the control link 584 in a counter-clockwise direction, and
simultaneously rotate
the cam link 594 in a clockwise direction. Thus, the torsion springs 600 tend
to increase
the angle 0 between the back control link 584 and the cam link 594. The stop
feature
592 on the seat support structure 522 limits counter clockwise rotation of the
back
control link 584 to the position shown in Fig. 49. This force may also bias
the control link
584 in a counter clockwise direction into the stop feature 592.
[00154] As discussed above, the back shell 216 is flexible, particularly in
comparison to the
rigid back frame structure 200. As also discussed above, the back frame
structure 200 is
rigidly connected to the back support structure 542, and therefore pivots with
the back
support structure 542. The forces generated by the torsion springs 600 push
upwardly
against the lower portion 220 of the back shell 216. As also discussed above,
the slots
244 in the back shell structure 216 create additional flexibility at the
lumbar support
portion or region 242 of the back shell 216. The force generated by the
torsion springs
600 also tends to cause the lumbar portion 242 of the back shell 216 to bend
forwardly
such that the lumbar portion 242 has a higher curvature than the regions
adjacent the
torsional springs 600.
[00155] As discussed above, the position of the lumbar assembly 300 is
vertically
adjustable. Vertical adjustment of the lumbar assembly 300 also adjusts the
way in
which the back shell 216 flexes/curves during recline of the chair back 18.
For example,
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when, the lumbar assembly 300 is adjusted to an intermediate or neutral
position, the
curvature of the lumbar portion 242 (Fig. 49) of the back shell 216 is also
intermediate or
neutral. If the vertical position of the lumbar assembly 300 is adjusted, the
angle 0 (Fig.
50) is reduced, and the curvature of the lumbar portion 242 is reduced. As
shown in Fig.
50, this also causes angle 01 to become greater, and the overall shape of the
back shell
216 to become relatively flat.
[00156] With further reference to Fig. 51, if the height of the lumbar
assembly 300 is set
at an intermediate level (i.e., the same as Fig. 49), and a user leans back,
the 4-bar
linkage defined by links and the structures 502, 522, 542, 558 and pivot
points 516, 518,
540, 556 will shift (as described above) from the configuration of Fig. 49 to
the
configuration of Fig 51. This, in turn, causes an increase in the distance
between the
pivot point 586 and the cam surface 598. This causes an increase in the angle
0 from
about 49.5 (Fig. 49) to about 59.9 (Fig. 51). As the spring rotates towards
an open
position, some of the energy stored in the spring is transferred into the back
shell 216,
thereby causing the degree of curvature of the lumbar portion 220 of the back
shell 216
to become greater. In this way, the back control link 584, the cam link 594,
and the
torsion springs 600 provide for greater curvature of the lumbar portion 242 to
reduce
curvature of a user's back as the user leans back in the chair.
[00157] Also, as the chair tilts from the position of Fig. 49 to the
position of Fig. 51, the
distance D between the lumbar region or portion 242 and the seat 16 increases
from
174mm to 234mm. A dimension D1 between the lumbar portion 242 of back shell
216
and the back frame structure 200 also increases as the back 18 tilts from the
position of
Fig. 49 to the position of Fig. 51. Thus, although the distance D increases
somewhat, the
increase in the dimension D1 reduces the increase in dimension D because the
lumbar
portion 242 of the back shell 216 is shifted forward relative to the back
frame 200 during
recline.
[00158] Referring again to Fig. 49, a spine 604 of a seated user 606 tends
to curve
forwardly in the lumbar region 608 by a first amount when a user 606 is seated
in an
upright position. As a user 606 leans back from the position of Fig. 49 to the
position of
Fig. 51, the curvature of the lumbar region 608 tends to increase, and the
user's spine
604 will also rotate somewhat about hip joint 610 relative to a user's femur
612. The
increase in the dimension D and the increase in curvature of the lumbar
portion 242 of
29
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the back shell 216 simultaneously ensure that the user's hip joint 610 and the
femur 612
do not slide on the seat 16, and also accommodate curvature of the lumbar
region 608 of
a user's spine 604.
[00159] As discussed above, Fig. 50 shows the back 18 of the chair in an
upright position
with the lumbar portion 242 of the back shell 216 adjusted to a flat position.
If the chair
back 18 is tilted from the position of Fig. 50 to the position of Fig. 52, the
back control
link 584 and the cam link 594 both rotate in a clockwise direction. However,
the cam link
594 rotates at a somewhat higher rate, and the angle 0 therefore changes from
31.4 to
35.9 . The distance D changes from 202mm to 265mm, and the angle 01 changes
from
24.2 to 24.1 .
[00160] With further reference to Fig. 52A, if the chair back 18 is
reclined, and the lumbar
adjustment is set high, the angle 0 is 93.6 , and the distance D is 202mm.
[00161] Thus, the back shell 216 curves as the chair back 18 is tilted
rearwardly. However,
the increase in curvature in the lumbar portion 242 from the upright to the
reclined
position is significantly greater if the curvature is initially adjusted to a
higher level. This
accounts for the fact that the curvature of a user's back does not increase as
much when
a user reclines if the user's back is initially in a relatively flat condition
when seated
upright. Restated, if a user's back is relatively straight when in an upright
position, the
user's back will remain relatively flat even when reclined, even though the
degree of
curvature will increase somewhat from the upright position to the reclined
position.
Conversely, if a user's back is curved significantly when in the upright
position, the
curvature of the lumbar region will increase by a greater degree as the user
reclines
relative to the increase in curvature if a user's back is initially relatively
flat.
[00162] A pair of spring assemblies 614 (Figs. 43 and 44) bias the back
assembly 18 (Fig. 4)
from the reclined position F towards the upright position E. As best
illustrated in Fig. 45,
each spring assembly 614 includes a cylindrically-shaped housing 616 having a
first end
618 and a second end 620. Each spring assembly 614 further includes a
compression coil
spring 622, a first coupler 624 and a second coupler 626. In the illustrated
example, the
first coupler 624 is secured to the first end 618 of the housing 616, while
the second
coupler 626 is secured to a rod member 628 that extends through the coil
spring 622. A
washer 630 is secured to a distal end of the rod member 628 and abuts an end
of the coil
spring 622, while the opposite end of the coil spring 622 abuts the second end
620 of the
CA 02881694 2015-02-10
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housing 616. The first coupler 624 is pivotably secured to the back support
structure 542
by a pivot pin 632 for pivoting movement about a pivot point 634, wherein the
pivot pin
632 is received within pivot apertures 636 of the back support structure 542,
while the
second coupler 626 is pivotably coupled to a moment arm shift assembly 638
(Figs. 53-
55) by a shaft 640 for pivoting about a pivot point 642. The moment arm shift
assembly
638 is adapted to move the biasing or spring assembly 614 from a low tension
setting
(Fig. 574) to a high tension setting (Fig. 584) wherein the force exerted by
the biasing
assembly 614 on the back assembly 18 is increased relative to the low-tension
setting.
[00163] As illustrated in Figs. 53-56, the moment arm shift assembly 638
includes an
adjustment assembly 644, a moment arm shift linkage assembly 646 operably
coupling
the control input assembly 500 to the adjustment assembly 644 and allowing the
operator to move the biasing assembly 614 between the low and high tension
settings,
and an adjustment assist assembly 648 that is adapted to reduce the amount of
input
force required to be exerted by the user on the control input assembly 500 to
move the
moment arm shift assembly 638 from the low tension setting to the high tension
setting,
as described below.
[00164] The adjustment assembly 644 comprises a pivot pin 650 that includes
a threaded
aperture that threadably receives a threaded adjustment shaft 652 therein. The
adjustment shaft 652 includes a first end 654 and a second end 656, wherein
the first end
654 extends through the aperture 514 of the base structure 502 and is guided
for pivotal
rotation about a longitudinal axis by a bearing assembly 660. The pivot pin
650 is
supported from the base structure 502 by a linkage assembly 662 (Fig. 44) that
includes a
pair of linkage arms 664 each having a first end 666 pivotably coupled to the
second
coupler 626 by the pivot pin 632 and a second end 668 pivotably coupled to the
base
structure 502 by a pivot pin 670 pivotably received within a pivot aperture
672 of the
base structure 502 for pivoting about a pivot point 674, and an aperture 675
that
receives a respective end of the pivot pin 650. The pivot pin 650 is pivotably
coupled
with the linkage arms 664 along the length thereof.
[00165] The moment arm shift linkage assembly 638 includes a first drive
shaft 676
extending between the control input assembly 500 and a first beveled gear
assembly
678, and a second drive shaft 680 extending between and operably coupling the
first
beveled gear assembly 678 with a second beveled gear assembly 682, wherein the
31
CA 02881694 2016-08-16
second beveled gear assembly 682 is connected to the adjustment shaft 652. The
first
drive shaft 676 includes a first end 684 operably coupled to the control input
assembly
500 by a first universal joint assembly 686, while the second end 688 of the
first drive
shaft 676 is operably coupled to the first beveled gear assembly 678 by a
second
universal joint assembly 690. In the illustrated example, the first end 684 of
the first
drive shaft 676 includes a female coupler portion 692 of the first universal
joint assembly
686, while the second end 688 of the first drive shaft 676 includes a female
coupler
portion 694 of the second universal joint assembly 690. The first beveled gear
assembly
678 includes a housing assembly 696 that houses a first beveled gear 698 and a
second
beveled gear 700 therein. As illustrated, the first beveled gear 698 includes
an integral
male coupler portion 702 of the second universal joint assembly 690. The first
end 706 of
the second drive shaft 680 is coupled to the first beveled gear assembly 678
by a third
universal joint assembly 704. The first end 706 of the second drive shaft 680
includes a
female coupler portion 708 of the third universal joint assembly 704. The
second
beveled gear 700 includes an integral male coupler portion 710 of the third
universal
joint assembly 704. A second end 712 of the second drive shaft 680 includes a
plurality
of longitudinally extending splines 714 that mate with corresponding
longitudinally
extending splines (not shown) of a coupler member 716. The coupler member 716
couples the second end 712 of the second drive shaft 680 with the second
beveled gear
assembly 682 via a fourth universal joint assembly 718. The fourth universal
joint
assembly 718 includes a housing assembly 720 that houses a first beveled gear
722
coupled to the coupler member 716 via the fourth universal joint assembly 718,
and a
second beveled gear 724 fixed to the second end 656 of the adjustment shaft
652. The
coupler member 716 includes a female coupler portion 726 that receives a male
coupler
portion 728 integral with the first beveled gear 722.
[00166] In
assembly, the adjustment assembly 644 (Figs. 53 and 54) of the moment arm
shift assembly 638 is operably supported by the base structure 502, while the
control
input assembly 500 (Fig. 42) is operably supported by the control input
assembly
mounting portion 536 (Fig. 44) of the seat support structure 522. As a result,
the relative
angles and distances between the control input assembly 500 and the adjustment
assembly 644 of. the moment arm shift assembly 638 change as the seat support
structure 522 is moved between the fully upright position G and the fully
reclined
32
CA 02881694 2016-08-16
position H. The third and fourth universal joint assemblies 704, 718, and the
arrangement
of the spline 714 and the coupler 716 cooperate to compensate for these
relative
changes in angle and distance.
[00167] The moment
arm shift assembly 638 (Figs. 53 and 54) functions to adjust the
biasing assemblies 614 between the low-tension and high-tension settings
(Figs. 57A-
588). Specifically, the biasing assemblies 614 are shown in a low-tension
setting with the
chair assembly 10 in an upright position in Fig. 57A, and the low-tension
setting with the
chair assembly 10 in a reclined position in Fig. 57B, while Fig. 58A
illustrates the biasing
assemblies 614 in the high-tension setting with the chair in an upright
position, and Fig.
58B the biasing assemblies in the high-tension setting with the chair assembly
10 in the
reclined position. The distance 730, as measured between the pivot point 642
and the
second end 620 of the housing 616 of the spring assembly 614, serves as a
reference to
the amount of compression exerted on the spring assembly 614 when the moment
arm
shift assembly 638 is positioned in the low-tension setting and the chair
assembly 10 is in
the upright position. The distance 730 (Fig. 58A) comparatively illustrates
the increased
amount of compressive force exerted on the spring assembly 614 when the moment
arm
shift assembly 638 is in the high-tension setting and the chair assembly 10 is
in the
upright position. The user adjusts the amount of force exerted by the biasing
assemblies
614 on the back support structure 542 by moving the moment arm shift assembly
638
from the low-tension setting to the high-tension setting. Specifically, the
operator,
through an input to the control input assembly 500, drives the adjustment
shaft 652 of
the adjustment assembly 644 in rotation via the moment arm shift linkage
assembly 646,
thereby causing the pivot shaft 650 to travel along the length of the
adjustment shaft
654, thus changing the compressive force exerted on the spring assemblies 614
as the
pivot shaft 650 is adjusted with respect to the base structure 502. The pivot
shaft 650
travels within a slot 732 located within a side plate member 734 attached to
an
associated side wall 508 of the base structure 502. It is noted that when the
moment arm
shift assembly 638 is in the high-tension setting and the chair assembly 10 is
in the
upright position the distance 730 is greater than the distance 730 when the
moment arm
shift assembly 638 is in the low-tension setting and the chair assembly 10 is
in the upright
position, thereby indicating that the compressive force as exerted on the
spring
assemblies 614, is greater when the moment arm shift is in the high-tension
setting as
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compared to a low-tension setting. Similarly, the distance 736' (Fig. 58B) is
greater than
the distance 736 (Fig. 57B), resulting in an increase in the biasing force
exerted by the
biasing assemblies 614 and forcing the back assembly 18 from the reclined
position
towards the upright position. It is noted that the change in the biasing force
exerted by
the biasing assemblies 614 corresponds to a change in the biasing torque
exerted about
the second pivot point 518, and that in certain configurations, a change in
the biasing
torque is possible without a change in the length of the biasing assemblies
614 or a
change in the biasing force.
[00168] Figure 59 is a graph of the amount of torque exerted about the
second pivot point
518 forcing the back support structure 542 from the reclined position towards
the
upright position as the back support structure 542 is moved between the
reclined and
upright positions. In the illustrated example, the biasing assemblies 614
exert a torque
about the second pivot point 518 of about 652 inch-pounds when the back
support
structure 542 is in the upright position and the moment arm shift assembly 638
is in the
low tension setting, and of about 933 inch-pounds when the back support
structure 542
is in the reclined position and the moment arm shift assembly 638 is in the
low tension
setting, resulting in a change of approximately 43%. Likewise, the biasing
assemblies 614
exert a torque about the second pivot point 518 of about 1.47E+03 inch-pounds
when
the back support structure 542 is in the upright position and the moment arm
shift
assembly 638 is in the high tension setting, and of about 2.58E+03 inch-pounds
when the
back support structure 542 is in the reclined position and the moment arm
shift assembly
638 is in the high tension setting, resulting in a change of approximately
75%. This
significant change in the amount of torque exerted by the biasing assemblies
614
between the low tension setting and the high tension setting of the moment arm
shift
assembly 638 as the back support structure 542 is moved between the upright
and
reclined positions allows the overall chair assembly 10 to provide proper
forward back
support to users of varying height and weight.
[00169] The adjustment assist assembly 648 (Figs. 53 and 54) assists an
operator in
moving the moment arm shift assembly 638 from the high-tension setting to the
low-
tension setting. The adjustment assist assembly 648 includes a coil spring 738
secured to
the front wall 504 of the base structure 502 by a mounting structure 740, and
a catch
member 742 that extends about the shaft 632 fixed with the linkage arms 664,
and that
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includes a catch portion 744 defining an aperture 746 that catches a free end
748 of the
coil spring 738. The coil spring 738 exerts a force F on the catch member 742
and the
shaft 632 in an upward vertical direction, and on the shaft 632 that is
attached to the
linkage arms 664, thereby reducing the amount of input force the user must
exert on the
control input assembly 500 to move the moment arm shift assembly 638 from the
low-
tension setting to the high-tension setting.
[00170] As noted above, the seat assembly 16 (Fig. 3) is longitudinally
shiftable with
respect to the control assembly 14 between a retracted position C and an
extended
position D. As best illustrated in Figs. 60 and 61, a direct drive assembly
1562 includes a
drive assembly 1564 and a linkage assembly 1566 that couples the control input
assembly 500 with the drive assembly 1564, thereby allowing a user to adjust
the linear
position of the seat assembly 16 with respect to the control assembly 14. In
the
illustrated example, the seat support plate 32 (Fig. 42) includes the C-shaped
guiderails
38 which wrap about and slidably engage corresponding guide flanges 1570 of a
control
plate 1572 of the control assembly 14. A pair of C-shaped, longitudinally
extending
connection rails 1574 are positioned within the corresponding guiderails 38
and are
coupled with the seat support plate 32. A pair of C-shaped bushing members
1576
extend longitudinally within the connection rails 1574 and are positioned
between the
connection rails 1574 and the guide flanges 1570. The drive assembly 1564
includes a
rack member 1578 having a plurality of downwardly extending teeth 1580. The
drive
assembly 1564 further includes a rack guide 1582 having a C-shaped cross-
sectional
configuration defining a channel 1584 that slidably receives the rack member
1578
therein. The rack guide 1582 includes a relief 1586 located along the length
thereof that
matingly receives a bearing member 1588 therein, wherein the bearing member
1588 as
illustrated in dashed line shows the assembly alignment between the bearing
member
1588 and the relief 1586 of the rack guide 1582, and further wherein the
bearing
member as illustrated in solid line shows the assembly alignment between the
bearing
member 1588 and the rack member 1578. Alternatively, the bearing member 1588
may
be formed as an integral portion of the rack guide 1582. The drive assembly
1564 further
includes a drive shaft 1590 having a first end 1592 universally coupled with
the control
input assembly 500 and the second end 1594 having a plurality of radially-
spaced teeth
1596. In assembly, the seat support plate 32 is slidably coupled with the
control plate
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1572 as described above, with the rack member 1578 being secured to an
underside of
the seat support plate 32 and the rack guide 1582 being secured within an
upwardly
opening channel 1598 of the control plate 1572. In operation, an input force
exerted by
the user to the control input assembly 500 is transferred to the drive
assembly 1564 via
the linkage assembly 1566, thereby driving the teeth 1596 of the drive shaft
1590 against
the teeth 1580 of the rack member 1578 and causing the rack member 1578 and
the seat
support plate 32 to slide with respect to the rack guide 1582 and the control
plate 1572.
[00171] With further reference to Figs. 62-64, the chair assembly 10
includes a height
adjustment assembly 1600 that permits vertical adjustment of seat 16 and back
18
relative to the base assembly 12. Height adjustment assembly 1600 includes the
pneumatic cylinder 28 that is vertically disposed in central column 26 of base
assembly
12 in a known manner.
[00172] A bracket structure 1602 is secured to the housing or base
structure 502, and an
upper end portion 1604 of the pneumatic cylinder 28 is received in an opening
1606 (Fig.
64) of the base structure 502 in a known manner. The pneumatic cylinder 28
includes an
adjustment valve 1608 that can be shifted down to release the pneumatic
cylinder 28 to
provide for height adjustment. A bell crank 1610 has an upwardly extending arm
1630
and a horizontally extending arm 1640 that is configured to engage the release
valve
1608 of the pneumatic cylinder 28. The bell crank 1610 is rotatably mounted to
the
bracket 1602. A cable assembly 1612 operably interconnects the bell crank 1610
with an
adjustment wheel/lever 1620. The cable assembly 1612 includes an inner cable
1614 and
an outer cable or sheath 1616. The outer sheath 1616 includes a spherical ball
fitting
1618 that is rotatably received in a spherical socket 1622 formed in the
bracket 1602. A
second ball fitting 1624 is connected to an end 1626 of the inner cable 1614.
A second
ball fitting 1624 is rotatably received in a second spherical socket 1628 of
the upwardly
extending arm 1630 of the bell crank 1610 to permit rotational movement of the
cable
end during height adjustment.
[00173] A second or outer end portion 1632 of the inner cable 1614 wraps
around the
wheel 1620, and an end fitting 1634 is connected to the inner cable 1614. A
tension
spring 1636 is connected to the end fitting 1634 and to the seat structure at
point 1638.
The spring 1636 generates tension on the inner cable 1614 in the same
direction that the
cable 1614 is shifted to rotate the bell crank 1610 when the valve 1608 is
being released.
36
CA 02881694 2016-08-16
Although the spring 1636 does not generate enough force to actuate the valve
1608, the
spring 1636 does generate enough force to bias the arm 1640 of the bell crank
1610 into
contact with the valve 1608. In this way, lost motion or looseness that could
otherwise
exist due to tolerances in the components is eliminated. During operation, a
user
manually rotates the adjustment wheel 1620, thereby generating tension on the
inner
cable 1614. This causes the bell crank 1610 to rotate, causing the arm 1640 of
the bell
crank 1610 to press against and actuate the valve 1608 of the pneumatic
cylinder 28. An
internal spring (not shown) of the pneumatic cylinder 28 biases the valve 1608
upwardly,
causing the valve 1608 to shift to a non-actuated position upon release of the
adjustment
wheel 1620.
[001741 The
control input assembly 500 (Figs. 42 and 65-67) comprises a first control
input
assembly 1700 and a second control input assembly 1702 each adapted to
communicate
inputs from the user to the chair components and features coupled thereto, and
housed
within a housing assembly 1704. The control input assembly 500 includes an
anti-back
drive assembly 1706, an overload clutch assembly 1708, and a knob 1710. The
anti-back
drive mechanism or assembly 1706 prevents the direct drive assembly 1562
(Figs. 60 and
61) and the seat assembly 16 from being driven between the retracted and
extended
positions C, D without input from the control assembly 1700. The anti-back
drive
assembly 1706 is received within an interior 1712 of the housing assembly 1704
and
includes an adaptor 1714 that includes a male portion 1716 of a universal
adaptor
coupled to the second end 1594 of the drive shaft 1590 (Fig. 61) at one end
thereof, and
including a spline connector 1717 at the opposite end. A cam member 1718 is
coupled
with the adaptor 1714 via a clutch member 1720. Specifically, the cam member
1718
includes a spline end 1722 coupled for rotation with the knob 1710, and a cam
end 1724
having an outer cam surface 1726. The clutch member 1720 (Fig. 668) includes
an
inwardly disposed pair of splines 1723 that slidably engage the spline
connector 1717
having a cam surface 1730 that cammingly engages the outer cam surface 1726 of
the
cam member 1718, as described below. The clutch member 1720 has a conically-
shaped
clutch surface 1719 that is engagingly received by a locking ring 1732 that is
locked for
rotation with respect to the housing assembly 1704 and includes a conically-
shaped
clutch surface 1721 corresponding to the clutch surface 1719 of the clutch
member 1720,
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and cooperating therewith to form a cone clutch. A coil spring 1734 biases the
clutch
member 1720 towards engaging the locking ring 1732.
[00175] Without input, the biasing spring 1734 forces the conical surface
of the clutch
member 1720 into engagement with the conical surface of the locking ring 1732,
thereby
preventing the "back drive" or adjustment of the seat assembly 16 between the
retracted
and extended positions C, D, simply by applying a rearward or forward force to
the seat
assembly 16 without input from the first control input assembly 1700. In
operation, an
operator moves the seat assembly 16 between the retracted and extended
positions C, D
by actuating the direct drive assembly 1562 via the first control input
assembly 1700.
Specifically, the rotational force exerted on the knob 1710 by the user is
transmitted
from the knob 1710 to the cam member 1718. As the cam member 1718 rotates, the
outer cam surface 1726 of the cam member 1718 acts on the cam surface 1730 of
the
clutch member 1720, thereby overcoming the biasing force of the spring 1734
and
forcing the clutch member 1720 from an engaged position, wherein the clutch
member
1720 disengages the locking ring 1732. The rotational force is then
transmitted from the
cam member 1718 to the clutch member 1720, and then to the adaptor 1714 which
is
coupled to the direct drive assembly 1562 via the linkage assembly 1566.
[00176] It is noted that a slight amount of tolerance within the first
control input assembly
1700 allows a slight movement (or "slop") of the cam member 1718 in the linear
direction and rotational direction as the clutch member 1720 is moved between
the
engaged and disengaged positions. A rotational ring-shaped damper element 1736
comprising a thermoplastic elastomer (TPE), is located within the interior
1712 of the
housing 1704, and is attached to the clutch member 1720. In the illustrated
example, the
damping element 1736 is compressed against and frictionally engages the inner
wall of
the housing assembly 1704.
[00177] The first control input assembly 1700 also includes a second knob
1738 adapted
to allow a user to adjust the vertical position of the chair assembly between
the lowered
position A and the raised position B, as described below.
[00178] The second control input assembly 1702 is adapted to adjust the
tension exerted
on the back assembly 18 during recline, and to control the amount of recline
of the back
assembly 18. A first knob 1740 is operably coupled to the moment arm shift
assembly
638 by the moment arm shift linkage assembly 646. Specifically, the second
control input
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assembly 1702 includes a male universal coupling portion 1742 that couples
with the
female universal coupler portion 692 (Figs. 53 and 55) of the shaft 676 of the
moment
arm shift linkage assembly 646.
[00179] A second knob 1760 is adapted to adjust the amount of recline of
the back
assembly 18 via a cable assembly 1762 operably coupling the second knob 1760
to a
variable back stop assembly 1764 (Fig. 67). The cable assembly 1762 includes a
first cable
routing structure 1766, a second cable routing structure 1768 and a cable tube
1770
extending therebetween and slidably receiving an actuator cable 1772 therein.
The cable
1772 includes a distal end 1774 that is fixed with respect to the base
structure 502, and is
biased in a direction 1776 by a coil spring 1778. The variable back stop
assembly 1764
includes a stop member 1780 having a plurality of vertically graduated steps
1782, a
support bracket 1784 fixedly supported with respect to the seat assembly 16,
and a slide
member 1786 slidably coupled to the support bracket 1784 to slide in a fore-to-
aft
direction 1788, and fixedly coupled to the stop member 1780 via a pair of
screws 1790.
The cable 1772 is clamped between the stop member 1780 and the slide member
1786
such that longitudinal movement of the cable 1772 causes the stop member 1780
to
move in the fore-and-aft direction 1788. In operation, a user adjusts the
amount of back
recline possible by adjusting the location of the stop member 1780 via an
input to the
second knob 1760. The amount of back recline available is limited by which
select step
1782 of the stop member 1780 contacts a rear edge 1792 of the base structure
502 as
the back assembly 18 moves from the upright position toward the reclined
position.
[00180] Each arm assembly 20 (Figs. 68-70) includes an arm support assembly
800
pivotably supported from an arm base structure 802, and adjustably supporting
an
armrest assembly 804. The arm support assembly 800 includes a first arm member
806, a
second arm 808, an arm support structure 810, and an armrest assembly support
member 812 that cooperate to form a 4-bar linkage assembly. In the illustrated
example,
the first arm member 806 has a U-shaped cross-sectional configuration and
includes a
first end 814 pivotably coupled to the arm support structure 810 for pivoting
about a
pivot point 816, and a second end 818 pivotably coupled to the armrest
assembly
support member 812 for pivoting movement about a pivot point 820. The second
arm
member 808 has a U-shaped cross-sectional configuration and includes a first
end 822
pivotably coupled to the arm support structure 810 for pivoting about a pivot
point 824,
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and a second end 826 pivotably coupled to the armrest assembly support member
812
for pivoting about a pivot point 828. As illustrated, the 4-bar linkage
assembly of the arm
support assembly 800 allows the armrest assembly 804 to be adjusted between a
fully
raised position K and a fully lowered position L, wherein the distance between
the fully
raised position K and fully lowered position L is preferably at least about 4
inches. Each
arm further includes a first arm cover member 807 having a U-shaped cross-
sectional
configuration and a first edge portion 809, and a second cover arm member 811
having a
U-shaped cross-sectional configuration and a second edge 813, wherein the
first arm
member 806 is housed within the first arm cover member 807 and the second arm
member 808 is housed within the second arm cover member 811, such that the
second
edge portion 813 and the first edge portion 809 overlap one another.
[00181] Each arm base structure 802 includes a first end 830 connected to
the control
assembly 14, and a second end 832 pivotably supporting the arm support
structure 810
for rotation of the arm assembly 20 about a vertical axis 835 in a direction
837. The first
end 830 of the arm base structure 802 includes a body portion 833 and a
narrowed
bayonet portion 834 extending outwardly therefrom. In assembly, the body
portion 833
and bayonet portion 834 of the first end 830 of the arm base structure 802 are
received
between the control plate 572 and the seat support structure 282, and are
fastened
thereto by a plurality of mechanical fasteners (not shown) that extend through
the body
portion 833 and bayonet portion 834 of the arm-base structure 802, the control
plate
572 and the seat support structure 282. The second end 832 of the arm base
structure
802 pivotably receives the arm support structure 810 therein.
[00182] As best illustrated in Fig. 71, the arm base structure 802 includes
an upwardly
opening bearing recess 836 having a cylindrically-shaped upper portion 838 and
a
conically-shaped lower portion 840. A bushing member 842 is positioned within
the
bearing recess 836 and is similarly configured as the lower portion 840 of the
bearing
recess 836, including a conically-shaped portion 846. The arm support
structure 810
includes a lower end having a cylindrically-shaped upper portion 848 and a
conically-
shaped lower portion 850 received within the lower portion 846 of the bushing
member
842. An upper end 852 of the arm support structure 810 is configured to
operably engage
within a vertical locking arrangement, as described below. A pin member 854 is
positioned within a centrally located and axially extending bore 856 of the
arm support
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structure 810. In the illustrated example, the pin member 854 is formed from
steel,
while the upper end 852 of the arm support structure 810 comprises a powdered
metal
that is formed about a proximal end of the pin member 854, and wherein the
combination of the upper end 852 and the pivot pin 854 is encased within an
outer
aluminum coating. A distal end 853 of the pin member 854 includes an axially
extending
threaded bore 855 that threadably receives an adjustment screw 857 therein.
The arm
base structure 802 includes a cylindrically-shaped second recess separated
from the
bearing recess 836 by a wall 860. A coil spring 864 is positioned about the
distal end 853
of the pin member 854 within the second recess 858, and is trapped between the
wall
860 of the arm base structure 802 and a washer member 866, such that the coil
spring
864 exerts a downward force 868 in the direction of arrow on the pin member
854,
thereby drawing the lower end of the arm support structure 810 into close
frictional
engagement with the bushing member 842, and the bushing member 842 into close
frictional engagement with the bearing recess 836 of the arm base structure
802. The
adjustment screw 857 may be adjusted so as to adjust the amount of frictional
interference between the arm support structure 810, the bushing member 842 and
the
arm base structure 802 and increasing the force required to be exerted by the
user to
move the arm assembly 20 about the pivot access 835 in pivot direction 837.
The pivot
connection between the arm support structure 810 and the arm base structure
802
allows the overall arm assembly 800 to be pivoted inwardly in a direction 876
(Fig. 72)
from a line 874 extending through pivot access 835 and extending parallel with
a center
line axis 872 of the seat assembly 16, and outwardly from the line 874 in a
direction 878.
Preferably, the arm assembly 20 pivots at least 17 in the direction 876 from
the line 874,
and at least 22 in the direction 878 from the line 874.
[00183] With further reference to Figs. 73-75, vertical height adjustment
of the arm rest is
accomplished by rotating the 4-bar linkage formed by the first arm member 806,
the
second arm member 808, the arm support structure 810 and the arm rest assembly
support member 812. A gear member 882 includes a plurality of teeth 884 that
are
arranged in an arc about the pivot point 816. A lock member 886 is pivotably
mounted
to the arm 806 at a pivot point 888, and includes a plurality of teeth 890
that selectively
engage the teeth 884 of the gear member 882. When the teeth 884 and 890 are
engaged, the height of the arm rest 804 is fixed due to the rigid triangle
formed between
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the pivot points 816, 824 and 888. If a downward force F4 is applied to the
armrest, a
counter clockwise (Fig. 74) moment is generated on the lock member 886. This
moment
pushes the teeth 890 into engagement with the teeth 884, thereby securely
locking the
height of the armrest.
[00184] An elongated lock member 892 is rotatably mounted to the arm 806 at
a pivot
point 894. A low friction polymer bearing member 896 is disposed over upper
curved
portion 893 of the elongated lock member 892. As discussed in more detail
below, a
manual release lever or member 898 includes a pad 900 that can be shifted
upwardly by
a user to selectively release the teeth 890 of the lock member 886 from the
teeth 884 of
the gear member 882 to permit vertical height adjustment of the armrest.
[00185] A leaf spring 902 includes a first end 904 that engages a notch 906
formed in an
upper edge 908 of the elongated locking member 892. Thus, the leaf spring 902
is
cantilevered to the locking member 892 at notch 906. An upwardly-extending tab
912 of
the elongated locking member 892 is received in an elongated slot 910 of the
leaf spring
902 to thereby locate the spring 902 relative to the locking member 892. The
end 916 of
the leaf spring 902 bears upwardly (F1) on the knob 918 of the locking member
886,
thereby generating a moment tending to rotate the locking member 886 in a
clockwise
(released) direction (Fig. 75) about the pivot point 888. The leaf spring 902
also
generates a clockwise moment on the elongated locking member 892 at the notch
906,
and also generates a moment on the locking member 886 tending to rotate the
locking
member 886 about the pivot point 816 in a clockwise (released) direction. This
moment
tends to disengage the gears 890 from the gears 884. If the gears 890 are
disengaged
from the gears 884, the height of the arm rest assembly can be adjusted.
[00186] The locking member 886 includes a recess or cut-out 920 (Fig. 74)
that receives
the pointed end 922 of the elongated locking member 892. The recess 920
includes a
first shallow V-shaped portion having a vertex 924. The recess also includes a
small
recess or notch 926, and a transverse, upwardly facing surface 928 immediately
adjacent
notch 926.
[00187] As discussed above, the leaf spring 902 generates a moment acting
on the locking
member 886 tending to disengage the gears 890 from the gears 884. However,
when the
tip or end 922 of the elongated locking member 892 is engaged with the notch
926 of the
recess 920 of the locking member 886, this engagement prevents rotational
motion of
42
CA 02881694 2016-08-16
=
the locking member 886 in a clockwise (released) direction, thereby locking
the gears 890
and the gears 884 into engagement with one another and preventing height
adjustment
of the armrest.
[00188] To release the arm assembly for height adjustment of the armrest, a
user pulls
upwardly on the pad 900 against a small leaf spring 899 (Fig. 74). The release
member
898 rotates about an axis 897 that extends in a fore-aft direction, and an
inner end 895 of
manual release lever 898 pushes downwardly against the bearing member 896 and
the
upper curved portion 893 (Fig. 75) of the elongated locking member 892. This
generates
a downward force causing the elongated locking member 892 to rotate about the
pivot
point 894. This shifts the end 922 (Fig. 74) of the elongated locking member
892
upwardly so it is .adjacent to the shallow vertex 924 of the recess 920 of the
locking
member 886. This shifting of the locking member 892 releases the locking
member 886,
such that the locking member 886 rotates in a clockwise (release) direction
due to the
bias of the leaf spring 902. This rotation causes the gears 890 to disengage
from the
gears 884 to permit height adjustment of the arm rest assembly.
[00189] The arm rest assembly is also configured to prevent disengagement
of the height
adjustment member while a downward force F4 (Fig. 74) is being applied to the
arm rest
pad 804. Specifically, due to the 4-bar linkage formed by arm members 806,
808, arm
support structure 810, and arm rest assembly support member 812, downward
force F4
will tend to cause pivot point 820 to move toward pivot point 824. However,
the
elongated locking member 892 is generally disposed in a line between the pivot
point
820 and the pivot point 824, thereby preventing downward rotation of the 4-bar
linkage.
As noted above, downward force F4 causes teeth 890 to tightly engage teeth
884,
securely locking the height of the armrest. If release lever 898 is actuated
while
downward force F4 is being applied to the armrest, the locking member 892 will
move,
and end 922 of elongated locking member 892 will disengage from notch 926 of
recess
920 of locking member 886. However, the moment on locking member 886 causes
teeth
890 and 884 to remain engaged even if locking member 892 shifts to a release
position.
Thus, the configuration of the 4-bar linkage and locking members 886 and gear
member
882 provides a mechanism whereby the height adjustment of the arm rest cannot
be
performed if a downward force F4 is acting on the arm rest.
43
CA 02881694 2016-08-16
[00190] As best illustrated in Figs. 76-78, each arm rest assembly 804 is
adjustably
supported from the associated arm support assembly 800 such that the arm rest
assembly 804 may be pivoted inwardly and outwardly about a pivot point 960
between
an in-line position M and pivoted positions N. Each arm rest assembly is also
linearly
adjustable with respect to the associated arm support assembly 800 between a
retracted
position 0 and an extended position P. Each arm rest assembly 804 includes an
armrest
housing assembly 962 integral with the arm rest assembly support member 812
and
defining an interior space 964. The arm rest assembly 804 also includes a
support plate
966 having a planar body portion 968, a pair of mechanical fastener receiving
apertures
969, and an upwardly extending pivot boss 970. A rectangularly-shaped slider
housing
972 includes a planar portion 974 having an oval-shaped aperture 976 extending
therethrough, a pair of side walls 978 extending longitudinally along and
perpendicularly
from the planar portion 974, and a pair of end walls 981 extending laterally
across the
ends of and perpendicularly from the planar portion 974. The arm rest assembly
804
further includes rotational and linear adjustment member 980 having a planar
body
portion defining an upper surface 984 and a lower surface 986. A centrally
located
aperture 988 extends through the body portion 982 and pivotally receives the
pivot boss
970 therein. The rotational and linear adjustment member 980 further includes
a pair of
arcuately-shaped apertures 990 located at opposite ends thereof and a pair of
laterally
spaced and arcuately arranged sets of ribs 991 extending upwardly from the
upper
surface 984 and defining a plurality of detents 993 therebetween. A rotational
selection
member 994 includes a planar body portion 996 and a pair of flexibly resilient
fingers 998
centrally located therein and each including a downwardly extending engagement
portion 1000. Each arm rest assembly 804 further includes an arm pad substrate
1002
and an arm pad member 1004 over-molded onto the substrate 1002.
[00191] In assembly, the support plate 966 is positioned over the arm rest
housing
assembly 962, the slider housing 972 above the support plate 966 such that a
bottom
surface 1006 of the planar portion 974 frictionally abuts a top surface 1008
of the
support plate 966, the rotational and linear adjustment member 980 between the
side
walls 978 and end walls 981 of the slider housing 972 such that the bottom
surface 986
of the rotational and linear adjustment member frictionally engages the planar
portion
974 of the slider housing 972, and the rotational selection member 994 is
above the
44
CA 02881694 2016-08-16
rotational and linear adjustment member 980. A pair of mechanical fasteners
such as
rivets 1010 extend through the apertures 999 of the rotational selection
member 994,
the arcuately-shaped apertures 990 of the rotational and linear adjustment
member 980,
and the apertures 969 of the support plate 966, and are threadably secured to
the arm
rest housing assembly 962, thereby securing the support plate 966, and the
rotational
and linear adjustment member 980 and the rotational selection member 994
against
linear movement with respect to the arm rest housing 962. The substrate 1002
and the
arm pad member 1004 are then secured to the slider housing 972. The above-
described
arrangement allows the slider housing 972, the substrate 1002 and the arm pad
member
1004 to slide in a linear direction such that the arm rest assembly 804 may be
adjusted
between the retracted position 0 and the extended position P. The rivets 1010
may be
adjusted so as to adjust the clamping force exerted on the slider housing 972
by the
support plate 966 and the rotational and linear adjustment member 980. The
substrate
1002 includes a centrally-located, upwardly-extending raised portion 1020 and
a
corresponding downwardly-disposed recess having a pair of longitudinally
extending
sidewalls (not shown). Each sidewall includes a plurality of ribs and detents
similar to the
ribs 991 and the detents 993 previously described. In operation, the pivot
boss 970
engages the detents of the recess as the arm pad 1004 is moved in the linear
direction,
thereby providing a haptic feedback to the user. In the illustrated example,
the pivot
boss 970 includes a slot 1022 that allows the end of the pivot boss 970 to
elastically
deform as the pivot boss 970 engages the detents, thereby reducing wear
thereto. The
arcuately-shaped apertures 990 of the rotational and linear adjustment member
980
allows the adjustment member 980 to pivot about the pivot boss 970 of the
support
plate 966, and the arm rest assembly 804 to be adjusted between the in-line
position M
and the angled positions N. In operation, the engagement portion 1000 of each
finger
998 of the rotational selection member selectively engages the detents 992
defined
between the ribs 991, thereby allowing the user to position the arm rest
assembly 804 in
a selected rotational position and providing haptic feedback to the user as
the arm rest
assembly 804 is rotationally adjusted.
[00192] A chair
assembly embodiment is illustrated in a variety of views, including a
perspective view (Fig. 79), a front elevational view (Fig. 80), a first side
elevational view
CA 02881694 2016-08-16
(Fig. 81), a second side elevational view (Fig. 82), a rear elevational view
(Fig. 83), a top
plan view (Fig. 84), and a bottom plan view (Fig. 85).
[00193] Another chair assembly embodiment without arms 20 is illustrated in
a variety of
views, including a perspective view (Fig. 86), a front elevational view (Fig.
87), a first side
elevational view (Fig. 88), a second side elevational view (Fig. 89), a rear
elevational view
(Fig. 90), a top plan view (Fig. 91), and a bottom plan view (Fig. 92). The
embodiments of
the chair assemblies illustrated in Figs. 79-92 may include all, some, or none
of the
features as described herein.
[00194] In the foregoing description, it will be readily appreciated by
those skilled in the
art that alternative combinations of the various components and elements of
the
invention and modifications to the invention may be made without departing
from the
concepts disclosed herein, when the concept is disclosed, such as applying the
inventive
concepts as disclosed herein to vehicle seating, stadium seating, home
seating, theater
seating and the like. Such modifications are to be considered as included in
the following
claims, unless these claims by their language expressly state otherwise.
=
46
