Note: Descriptions are shown in the official language in which they were submitted.
CA 022~3010 1998-11-20
C~ ~
MULTI-PURPOSE TOOL INCLUDING TWEEZERS
Background of the Invention
The present invention relates to multi-purpose
folding tools, and in particular to folding scissors
incorporated in such tools.
Folding scissors of various types have been
known for many years and have long been included in
multi-purpose folding tools. In the past, most folding
scissors in such multi-purpose tools have been very
small, and therefore relatively ineffective.
One type of folding scissors in a multi-purpose
tool is disclosed, for example, in Moser U.S. Patent No.
696,995. In that type of tool one blade of a pair of
scissors has an extended handle which is attached to
pivot the entire pair of scissors into a storage slot in
a knife handle. A second handle and its attached scis-
sors blade are also stowed in the same slot, with the
scissors blades and handles generally parallel with one
another. A small leaf spring is typically used to urge
the handles apart from each other to open the blades of
such a pair of miniature scissors, and the spring is kept
compressed when the scissors are in the stowed position.
The spring typically used in such scissors is easily lost
or bent accidentally to an inoperative condition.
East German Patent Publication 2,322,229
discloses another type of folding scissors using a long
spring in a handle of a tool to move an auxiliary lever
to urge a movable scissors handle toward a blade-opening
position. This arrangement, however, fails to hold the
main scissors handle stably fixed relative to the tool
handle when the movable scissors handle and blade are
urged in a blade-closing direction with respect to the
main blade.
German Patent No. 145784 discloses a tool
incorporating a folding handle with a pair of scissors
blades which can be stowed within a multi-purpose tool
CA 022~3010 1998-11-20
handle, but such scissors include the previously
mentioned type of spring or none at all.
In previously known folding scissors including
a spring for opening the scissors blades, the force
needed to move the blades in a closing or cutting direc-
tion has increased with continued closing movement of the
blades. It is therefore desired to provide scissors
which are easier to use in that the force needed to close
the blades completely is not greatly increased over that
required to close the blades partially during a cutting
stroke of the scissors.
What is needed, then, is an improved multi-
purpose folding tool including folding scissors which
are easily used, which provides ample leverage through
handles of adequate length, which are easily stowed
within the handle of the multi-purpose folding tool, and
which do not interfere with the utility of other folding
tool bits included in the multi-purpose folding tool. It
is also desired for such folding scissors to be larger
than previously available folding scissors included in a
multi-purpose folding tool of a comparable size, and that
the entire tool in a folded configuration can be easily
carried in a person's pocket without causing unnecessary
wear of the fabric of the pocket.
Summary of the Invention
The present invention provides a multi-purpose
folding tool which overcomes the previously-mentioned
shortcomings and disadvantages of previously known fold-
ing tools by providing improved folding scissors andother tools having pivotally interconnected jaws or the
like.
In one embodiment of the present invention a
channel-shaped folding handle is attached to each of a
pair of interconnected movable members such as the blades
of a pair of scissors and a pair of springs in each
handle operate, respectively, on the attached member such
CA 022~3010 1998-11-20
as a scissors blade and an adjacent rocker. Both springs
in each handle operate to hold the handles together with
the multi-purpose tool in a folded configuration. With
the scissors, for example, ready for use, one spring in
each handle holds the attached scissors blade securely
aligned with the handle, while the other spring operates
the associated rocker to urge the scissors blades toward
an open position after each cutting stroke. Each rocker
is linked with the adjacent scissors blade so that the
rocker is free to pivot through a small angle relative to
the blade but is moved along with the blade between the
stowed position and the deployed position of the blade.
In a preferred embodiment of the invention,
additional folding tool bits are included in the handles,
mounted on tool pivot shafts spaced apart in the handles
from the location of the scissors blades. When such tool
bits are used, the handles are prevented from moving
laterally with respect to each other by an ear on one of
the springs in each handle and by a portion of each
rocker extending alongside the scissors blade associated
with the other handle.
In one embodiment of the invention a lanyard-
attachment ear mounted on a pivot shaft may be extended
for use or folded into a stored position where it is not
likely to wear the fabric of a pocket in which the tool
is carried.
In another preferred embodiment of the
invention a pair of folding scissors is movable around a
pivot shaft, between a stowed position in a handle of a
multi-purpose folding tool and a deployed position in
which the folding scissors extends with a first scissors
blade held in a fixed position with respect to the handle
of the multi-purpose tool. A second scissors blade is
pivoted with respect to the first, while an operating
lever is pivoted with respect to both of the blades and
can engage the movable blade to move the blades toward a
closed position in a cutting stroke of the scissors.
CA 022~3010 1998-11-20
A rocker is mounted to pivot about the same
shaft on which the main scissors blade is mounted and is
pushed by a leaf spring also used to hold a selected one
of the several tool bits of the multi-purpose tool. The
rocker includes an outer end which pushes against a base
portion of the movable second scissors blade to urge the
blades toward an open position during use of the scis-
sors. A single spring included in the handle of the
multi-purpose tool thus operates to hold the main blade
in position with respect to the handle and also to oper-
ate the rocker which moves the second scissors blade
toward an open position during operation of the scissors
according to the invention.
In one embodiment of the invention the
operating lever nests alongside the scissors blades in
the stowed position of the folding scissors, but is
easily lifted into a position in which a portion of its
base operates as a cam to move the scissors from their
stowed position toward the deployed position.
In another embodiment of the invention,
adjacent blades are engaged by tapered tips of adjacent
springs each engaging only a particular one of the
adjacent blades.
In other embodiments of the invention, pliers
or other tools may include jaws or jawlike members pivot-
ally interconnected with each other and arranged to be
folded and stowed in tool handles in a manner similar
to that in which the scissors blades operate and are
interrelated with the tool handles.
The foregoing and other objectives, features,
and advantages of the invention will be more readily
understood upon consideration of the following detailed
description of the invention, taken in conjunction with
the accompanying drawings.
CA 022~3010 1998-11-20
Brief Description of the Drawings
FIG. 1 is an elevational view of a multi-
purpose folding tool which is an embodiment of the
present invention.
FIG. 2 is a left side view of the tool shown in
FIG. 1, in a folded configuration.
FIG. 3 is a scissors end view of the tool shown
in FIG. 1, in the folded configuration shown in FIG. 2.
FIG. 4 is a tool bit end view of the tool shown
in FIG. 1, in the folded configuration shown in FIG. 2.
FIG. 5 is a bottom view of the tool shown in
FIG. 1, in the folded configuration shown in FIG. 2.
FIG. 6 is a right side view of the multi-
purpose tool shown in FIG. 1, in the folded configuration
shown in FIG. 2.
FIG. 7 is a sectional view of the multi-purpose
tool shown in FIG. 1, taken along line 7-7 of FIG. 4.
FIG. 8 is a sectional view similar to that of
FIG. 7, showing the multi-purpose tool with one handle in
a partially extended position.
FIG. 9 is a sectional view of the same portion
of the tool as shown in FIG. 7, showing both handles
extended with the scissors blades of the multi-purpose
tool in their deployed, open positions, ready for use.
FIG. 10 is a sectional view, similar to that of
FIG. 9, of a detail of the scissors and a portion of each
of the handles of the tool with the scissors blades moved
toward each other to their fully closed position.
FIG. 11 is a sectional detail view of the same
portion of the tool shown in FIG. 9, showing the scissors
blades opened further to their maximum separation.
FIG. 12 is a sectional view of a portion of the
tool bit end of the multi-purpose tool, taken in the
direction of line 7-7 in FIG. 4, showing the flat
Phillips screwdriver blade in its deployed position.
FIG. 13 is a sectional view of a portion of one
of the handles of the tool, taken in the direction of
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line 7-7 of FIG. 4, showing the lanyard attachment eye in
a pocket-carried configuration of the tool.
FIG. 14 is an elevational view of a multi-
purpose folding tool which is another embodiment of the
present invention.
FIG. 15 is a view of a part of the tool shown
in FIG. 14, taken in the direction of line 15-15, with
the scissors and other adjacent tools stowed in one
handle.
FIG. 16 is an elevational view of the tool
shown in FIG. 14, with the handles folded together around
the pliers jaws and with the folding scissors deployed,
but with the remaining tool bits in their folded
positions.
FIG. 17 is a sectional view taken along line
17-17 of FIG. 16.
FIG. 18 is a sectional view of the folding
scissors and a portion of the handle with which the
folding scissors is associated, taken along line 18-18 of
FIG. 17, but omitting the other tools folded within the
handle, for the sake of clarity in illustration of the
scissors of the present invention.
FIG. 19 is a sectional view similar to that of
FIG. 18, showing the operating lever of the folding
scissors at an intermediate position during unfolding of
the scissors blades from the fully stowed position.
FIG. 20 is a view similar to that of FIG. 18,
with the operating lever rotated further and showing the
manner in which the operating lever moves the scissors
further from the stowed position toward their deployed
position.
FIG. 21 is another view similar to FIG. 18,
showing the folding scissors deployed, with the operating
lever partially cut away and the scissors blades fully
closed.
FIG. 22 is a view similar to FIG. 21, showing
the scissors blades fully open.
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FIG. 23 is a view similar to FIG. 21, showing
the scissors blades partially closed.
FIG. 24 is a sectional view taken along line
24-24 of FIG. 16 at an enlarged scale.
FIG. 25 is a view similar to that of FIG. 20,
with the scissors blades in position for sharpening.
FIG. 26 is a sectional view taken along line
26-26 of FIG. 21.
Detailed Description of the Preferred Embodiments
Referring now to FIGS. 1-13 of the drawings
which form a part of the disclosure herein, a folding
multi-purpose tool 30 includes a pair of folding scissors
32 which can be received within a pair of handles 34 and
36 when the tool 30 is in a folded configuration as shown
in FIGS. 2-7. Additional tool bits, such as a nail file
38, a medium screwdriver 40, and a knife blade 42, may be
stowed within a cavity 44 defined within the first handle
34, and a combined small screwdriver and cap lifter 46, a
flat Phillips screwdriver 48, and a pair of tweezers 50
may be stowed within a cavity 52 defined within the
second handle 36. The just-mentioned additional tools
may each be extended to a position parallel with the
respective handle 34 or 36 for use. A lanyard attachment
ear 54 is attached to the second handle 36, and a split
ring 56 or other suitable fastening device may be engaged
in a hole 58 defined in the lanyard receiving ear 54.
The lanyard receiving ear 54 is movable in the direction
indicated by the arrow 60, as will be discussed in
greater detail subsequently.
Each of the handles 34 and 36 includes a wide
portion 62 and a narrow scissors-end portion 64, formed
appropriately of stainless steel sheet generally in the
form of a channel including a bottom portion 66 (see
FIG. 5). Respective side walls 68 extend generally
perpendicularly away from the bottom 66 and parallel with
each other except in tapering portions 70 and 72.
CA 022~30l0 l998-ll-20
A tool pivot shaft 74, which may be a tubular
internally threaded screw fastener with a mating extern-
ally threaded counterpart, is located in the wide portion
62 of each of the handles 34 and 36, extending trans-
versely between the side walls 68 at a tool bit end of
each handle. During assembly of the tool 30 the tool
pivot shafts 74 are adjusted to provide sufficient ten-
sion to ensure a snug fit between the sidewalls 68 for
the members rotating thereon, yet permit smooth movement,
and are then held in the required position by an adhe-
sive. The tool pivot shafts 74 act as fulcrums for each
of the tool bits such as the knife blade 42 and tweezers
50. A leaf spring 76 iS a cantilevered extension of the
bottom 66 and bears upon the base portion of each of the
folding tool bits to hold them selectively in an extended
position, parallel with the respective handle 34 or 36
and ready for use.
At the scissors-end portion 64 of each handle,
a respective scissors pivot pin 78, which may also be
called a jaw pivot pin, is a fastener similar to the tool
pivot shaft 74, but shorter.
The folding scissors 32 included in the folding
tool 30 include a pair of blades, a first scissors blade
80 and a second scissors blade 82, which pivot with
respect to each other about a scissors pivot joint 84
defined, for example, by a fastener such as a countersunk
rivet interconnecting the two scissors blades 80 and 82.
First and second scissors blades 80 and 82 are identical
with each other, but are given different reference
numbers here to facilitate understanding of their inter-
action with each other. Each of the blades 80 and 82
includes a respective base portion 86 extending from the
scissors pivot joint 84 toward the respective handle 34
or 36 with which the particular blade is interconnected.
A cutting portion 88 of each blade extends away from the
scissors pivot joint 84 and culminates in a blade tip 90.
The base portion 86 of each of the scissors blades 80 and
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82 includes an aperture 92 that fits snugly around a
respective one of the scissors pivot pins 78 in handle
pivots which define respective handle pivot axes 79 about
which each base portion 86 rotates with respect to the
respective handle 34 or 36.
Each of a pair of identical rockers 94 and 96
includes an aperture 98 which also fits around a respec-
tive scissors pivot pin 78, permitting each of the
rockers 94, 96 to pivot smoothly about the respective
scissors pivot pin 78 which thus defines a respective
rocker pivot axis coinciding with the handle pivot axis
79. The rocker 94 iS thus associated with and located
alongside the first scissors blade 80, and the rocker 96
is associated with and located alongside the second
scissors blade 82. The scissors pivot pin 78 iS pref-
erably of a length which when fully tightened leaves some
axial clearance for the scissors blade base portion 86
and the respective rocker 94 or 96 SO that they are
generally free to move relative to each other, the pin
78, and the respective handle 34 or 36, as will be
explained presently.
Each of the rockers 94 and 96 includes a
projecting pin 100, which may be fastened thereto as a
separate piece but preferably is formed by swaging the
rocker. The pin 100 projects toward and into a slot 102
in the base portion 86 of the adjacent scissors blade 80
or 82, which receives the pin 100 of the associated
rocker 94 or 96 and permits the rocker to rotate through
only a limited angle with respect to the associated scis-
sors blade 80 or 82, about the rocker pivot axis defined
by respective scissors pivot pin 78. While the slot 102
is shown as a kidney-shaped slot extending entirely
through the base portion 86 of each scissors blade 80 or
82, it is conceivable that the slot 102 may be of another
shape or may not extend the entire distance through the
respective base portion 86, SO long as it receives the
pin 100 and thus limits movement of the respective rocker
CA 022~3010 1998-11-20
when the rocker and base portion are located closely
alongside each other.
Included within each of the handles 34 and 36
are a pair of springs, a scissors blade spring 104 and a
rocker spring 106. As may be seen in FIGS. 5 and 7,
these springs are generally similar in shape and are
located side-by-side within each cavity 44 or 52. An
anchoring end 108 of the scissors blade spring 104 and an
anchoring end 110 of the rocker spring 106 include aper-
tures which fit snugly on the respective tool pivot shaft
74. A hump 111 located in a middle portion of each
rocker spring 106 protrudes into the cavity 44 or 52. A
similar hump 111 is preferably present in the correspond-
ing location on each scissors blade spring 104, but could
optionally be omitted.
The springs 104 and 106 extend along the bottom
66 over a portion of the length of each handle 34, 36 to
the bottom 112 of a slot defined in the end of bottom 66
nearer to the scissors pivot pin 78 of each handle. The
respective tips 114, 116, of the scissors blade spring
104 and rocker spring 106 extend along the slot in the
bottom 66 and are thus free to move toward and away from
the respective scissors pivot pins 78, in contact with
and following the shapes of the respective base portions
86 and rockers 94, 96, but the sides of the slot 112 keep
the springs 104 and 106 from moving laterally and thus
keep them aligned with the respective scissors blade 80
or 82 and rocker 94 or 96.
The tips 114 and 116 of the blade spring and
rocker spring, respectively, are each tapered in width to
be about .025 inch narrower than the anchoring ends 108
and 110, to provide lateral clearance between the adja-
cent spring tips 114 and 116, as shown in FIG. 5. This
ensures that the springs can flex and the spring tips 114
and 116 can move independently of each other without the
need for a spacer plate between the springs 104 and 106.
The spring tips 114 and 116 are each also about 0.02 inch
CA 022~30l0 l998-ll-20
narrower than the thickness of each of the rockers 94, 96
and the base portions 86 of the scissors blades 80, 82 on
which they act, to ensure that the spring tips 114 and
116 engage only the intended rocker 94 or 96 or the
intended base portion 86. The anchoring ends 10 8 and
110, on the other hand, are together about 0.010 inch
thicker than the combined thicknesses of the scissors
blades 80, 82 and the rockers 94 and 96 SO that the
blades and rockers can be moved easily into the cavities
44 and 52 of the handles 34, 36.
With the folding tool 30 in the folded
configuration shown in FIGS. 2-7, a generally flat
surface 118 of each base portion 86 rests against each
scissors blade spring tip 114, and a generally flat
surface 120 on each rocker 94 or 96 rests against the
rocker spring tip 116, with the respective tips 114 and
116 pressing against the flat surfaces 118 and 120.
The springs 104 thus urge the scissors blades
80, 82 to rotate about the respective scissors pivot pins
78 toward the stowed position shown best in FIG. 7, with
the base portion 86 of each of the scissors blades 80, 82
nested snugly between the respective scissors blade
spring 104 and the oppositely located rocker spring 106.
As a result, the scissors blades are rotated with respect
to each other about the scissors pivot joint 84 SO that
the blade tips 90 are located about 10~ past each other,
in a crossing configuration, when the scissors blades 80,
82 are in their respective stowed positions within the
cavities 44, 52 defined by the handles 34, 36.
At the same time, the rocker springs 106 press
against the flat surfaces 120 of the rockers 94, 96
urging them to rotate in the same direction as the
respective base portion 86 with which each rocker is
linked by the respective combination of a pin 100 and
slot 102. The pin 100 is located so as to be in contact
with the interior surface defining the slot 102 SO that
the force of the rocker spring 106 iS carried through the
CA 022~30l0 l998-ll-20
pin 100 and slot 102 and helps to urge the scissors
blades to rotate into the respective cavity 44 or 52
defined within the handle 34 or 36 with which the respec-
tive scissors blade 80 or 82 iS interconnected. Because
the scissors blades 80, 82 are interconnected through the
scissors pivot joint 84, all four springs, both of the
scissors blades springs 104 and both of the rocker
springs 106, urge the scissors blades 80, 82 into the
crossing configuration shown in FIG. 7 and urge the
handles 34, 36 together to retain the tool 30 in its
folded configuration.
When the tool 30 iS in the folded configuration
the ends of the handles 34 and 36 are held aligned with
each other laterally by protruding ears 122 located on
the anchoring ends 108 of the scissors blade springs 104,
and by cam lobes 124 included in each of the rockers 94,
96. The ears 122 overlap and are located alongside each
other and between each other and the base of an adjacent
folded tool blade, as shown in FIG. 4, keeping the tool
bit ends of the handle aligned with each other. The cam
lobes 124 similarly extend alongside each other and
between each other and one of the side walls 68 in the
narrow scissors end portion 64 of the opposite handle 34
or 36, as shown in FIG. 3, keeping the scissors ends of
the handles 34, 36 aligned. The ears 122 may, as shown
in FIG. 4, be slightly narrower than the rest of the
anchoring end 108 or 110 to avoid interference as they
pass by each other as the tool 30 iS being folded. It
will be understood that the ears 122 might be provided on
the rocker springs 106 instead of the scissors blade
springs 104 with the same results.
Each scissors blade 80 and 82 has an outer
margin 125 which rests closely along an inner surface of
the tip 116 and a very small distance away from the hump
111 of the opposite rocker spring 106 inside the opposite
cavity 44 or 52. The tool 30 in its folded configuration
thus is as compact as practical, yet each scissors blade
CA 022~30l0 l998-ll-20
incorporates all the material for which there is room
within the cavity to ensure adequate strength.
For use, the scissors 32 are deployed from the
folded configuration of the folding tool 30 by separating
the handles 34, 36, rotating each of the scissors blades
80, 82 about one of the scissors pivot pins 78 with
respect to the handle 34 or 36 with which it is intercon-
nected. As the scissors blades 80, 82 are rotated with
respect to the handles 34, 36, for example, by rotation
of the second blade 82 with respect to the handle 36 to
the position shown in FIG. 8, both the scissors blade
spring 104 and rocker spring 106 of the respective handle
are forced to flex away from the scissors pivot pin 78 by
respective cam surfaces 126 of the base portions 86 of
the scissors blades, and similar cam surfaces 128 of the
rockers 94, 96. The cams at first strongly resist move-
ment of the scissors blades 80 and 82 away from their
stowed positions within the cavities 44 and 52, and
because of the linking provided by the pin 100 within the
slot 102, both the scissors blade base portions 86 and
the rockers 94 and 96 resist such relative movement of
the scissors blades 80 and 82 away from their stowed
positions in the cavities 44 and 52. Once the spring
tips 114 and 116 are resting against the cam surfaces
126, 128, however, only friction resists further movement
of the handles through a small angle, after which the
spring tips 114 of the scissors blades springs 104
encounter the flat detent surface 129 on the base portion
86 of each of the scissors blades 80 and 82. Each flat
detent surface 129 iS oriented approximately perpendic-
ular to the length of the respective scissors blade 80 or
82, and acts together with the respective scissors blade
spring tip 114 as a detent to hold the respective handle
34 or 36 stable with respect to the scissors blade 80 or
82, in a position similar to that of the handle 36 as
shown in FIG. 8. This position improves the ease and
safety of gaining access to the tool bits stowed in the
CA 022~30l0 l998-ll-20
14
particular handle, such as the screwdriver and cap lifter
46, the flat Phillips screwdriver 48, and the tweezers
50, in the handle 36. When both handles 34 and 36 are
similarly positioned the respective detents hold the two
handles in line with each other so that a scale 131
inscribed on the handles can be used for measurements up
to the combined lengths of the two handles 34 and 36.
Moving each handle 34 or 36 further in the same
direction with respect to the attached scissors blade 80
or 82 brings the respective scissors blade spring tip 114
onto the flat surface 130 on each base portion 86, and
the force of each scissors blade spring 104 then urges
the respective scissors blade to rotate toward the
deployed position shown in FIGS. 1 and 9.
When a scissors blade 80 or 82 iS in the
deployed position the respective spring tip 114 of the
scissors blade spring 104 rests against a handle exten-
sion stop 132 which then prevents the handle from moving
further with respect to the scissors blade base portion
86. As a result, when both of the blades 80, 82 are
deployed, with the handles 34, 36 fully extended as shown
in FIG. 9, the scissors blade springs 104 and rocker
springs 10 6 face toward each other. Movement of the
handles 34, 36 toward each other then results in movement
of the cutting portions 88 of the scissors blades toward
each other in a scissors blade closing direction.
Each of the rockers 94, 96 includes a finger-
like outer end 134 which rests against a cam surface 136
of the base portion 86 of the opposite scissors blade.
Thus the outer end 134 of the rocker 94 rests against the
cam surface 136 of the base portion 86 of the scissors
blade 82 as shown in FIGS. 1 and 9. Since the cam lobe
124 of the rocker 94 rests against the rocker spring 106
associated with the handle 34, movement of the handles
34, 36 toward one another is resisted by the force of the
spring 106 as the cam face 136 moves into contact with
the outer end 134 of the rocker 94 and moves it in a
CA 022~3010 1998-11-20
counterclockwise direction about the scissors pivot pin
78 of the handle 34. As the handles 34, 36 are moved
toward each other to move the cutting portions 88 toward
each other in a cutting motion of the scissors blades 80,
82 about the scissors pivot joint 84, the rocker springs
106 oppose further movement in such a scissors-closing
direction. However, because of the size of the slot 102
or equivalent opening defined in the base portion 86 of
the blade 80, the rocker 94 is free to move counterclock-
wise about the scissors pivot pin 78 with respect to the
scissors blade 80, except as such movement is opposed by
the rocker spring 106 of the handle 34.
As the outer end 134 moves along the cam
surface 136 toward the scissors pivot joint 84, the lever
arm lengths about the scissors pivot pin 78 and the
scissors pivot joint 84 change. The force required to
continue to move the handles 34, 36 toward each other
thus increases less than the force exerted by the spring
106 increases, and the force on the handles 34 required
for closing the cutting portions 88 of the scissors
blades does not increase unpleasantly during a complete
cutting stroke of the scissors 2.
Referring now to FIG. 10, when the cutting
portions 88 of the scissors blades have completed a
cutting stroke the blade tips 90 are barely past one
another. Rotation of the rockers 94, 96 has then flexed
each rocker spring 106 so that its tip 116 is displaced
toward the facing spring tip 114 of the scissors spring
104 of the opposite handle. Each spring tip 116 is
thereby moved into contact with the spring tip 114 in the
opposite one of the handles 34 and 36 preventing further
movement of the handles 34, 36 toward each other,
completing a cutting or blade-closing stroke of the
scissors 32.
When pressure on the handles 34, 36 is
released, the potential energy stored in the rocker
springs 106 moves the rockers 94, 96. The outer ends
CA 022~30l0 l998-ll-20
16
134 act upon the cam surfaces 136 of the opposite base
portions 86, SO that the rocker springs 106 open the
cutting portions 88 of the scissors blades in preparation
for a subsequent cutting stroke.
The scissors blades are prevented from opening
beyond a desired position where the edges of the cutting
portions 88 are still registered with one another ready
to cut material, by a scissors opening stop 138 included
in the base portion 86 of each of the scissors blades.
The scissors opening stop 138 encounters an outer face
140 of the rocker, as shown in FIG. 11, rotating the
rocker 94 clockwise and the rocker 96 counterclockwise,
as shown, until the pin 100 engages the interior of the
slot 102 into which it extends and thereby is prevented
from rotating further with respect to the base portion 86
of the scissors blade interconnected with the one of the
handles on which the particular rocker is located.
When it is desired to return the tool 30 to its
folded configuration with the scissors blades 80, 82 in
their stowed position within the cavities 44, 52, it is
necessary simply to move the handles 34, 36 away from
each other beyond the position where the scissors blades
are prevented from opening further. The scissors blades
springs 104 and rocker springs 106 are thereby flexed as
their tips 114, 116 again encounter the cam faces and
flats 126, 128. When the spring tips 114, 116 begin to
ride off the cam surfaces 126, 128 they again act against
the flat surfaces 118 of the base portions 86 and the
flat surfaces 120 of the rockers 94, 96 to urge the
handles 34, 36 to spring toward one another into the
folded configuration as described previously.
As the handles 34, 36 are moved toward their
respective folded positions, hump 111 of the respective
rocker spring 106 approaches the outer margin 125 of each
of the blades 80, 82. If the tool bit ends of the
handles move closer toward each other than the separation
between the scissors ends of the two handles at that time
CA 022~30l0 l998-ll-20
the hump 111 causes the scissors blades 80 and 82 to
rotate about the scissors pivot joint 84 toward the
crossing configuration, thus bringing the scissors pivot
pins 78 and the scissors ends of the handles closer
together. As a result, the tool moves smoothly into the
folded configuration regardless of where pressure is
applied along the length of each handle 34 or 36.
With the appropriate one of the handles 34 or
36 moved to a position such as that of the handle 36 as
shown in FIG. 8, a desired one of the additional tool
blades can be rotated into an extended position such as
the position of the flat Phillips screwdriver blade 48 as
shown in FIG. 12. The handles 34, 36 can then be
returned to the closed configuration with respect to each
other while the extended tool blade is held in place by
the action of the leaf spring 76 against a base portion
of the tool blade in the manner well-known in folding
knives. With the handles 34, 36 held close together by
the action of the scissors blade springs 104 and rocker
springs 106, and with the ears 122 of the scissors blade
springs and the cam lobes 124 of the rockers 94, 96
extending into spaces provided alongside each other in
the opposite handles as explained previously, the handles
34, 36 are held in place with respect to each other,
allowing screwdriver blades to be used without the
handles 34, 36 being displaced laterally from each other
by the twisting force used.
The above-described arrangement for holding a
folding tool incorporating the scissors blades 80, 82 in
a folded configuration and for urging the blades 80, 82
open when they are in their deployed position with
respect to the handles may also be used for operation of
tools such as pliers or special grasping tools, not
shown, which include a pair of relatively movable inter-
connected members such as jaws or jawlike members which
pivot with respect to each other about a jaw pivot joint
corresponding to the scissors pivot joint 84. Such jaws
CA 022~30l0 l998-ll-20
18
or jawlike members include acting portions corresponding
to the cutting portions 88 of the scissors blades 80, 82,
and an arrangement of springs, which may be referred to
in such devices as jaw springs, corresponding to the
scissors blade springs 104 would act upon base portions
of the jaws or jawlike members of such a tool. Simi-
larly, such a tool would include rockers such as the
rockers 94, 96 linked with the base portion of such
jawlike members and interacting with such jawlike members
to limit their movement appropriately and to assist in
keeping the folding tool including such jaws or jawlike
members securely in its folded configuration.
In order to make the folding tool 30 as compact
as possible yet have a Phillips screw driving capability,
the flat Phillips screwdriver blade 48 iS generally
planar, rather than having a cruciform driving end. The
blade 48 tapers similar to the flutes of a Phillips
screwdriver from a maximum thickness at 49, beyond the
angled faces 51, to a minimum thickness of 0. 022 inch at
the transverse end face 53. The angled faces 51 form an
included angle 55 of 53~, corresponding to the shape of a
Phillips head screw socket, and the transverse end face
53 preferably has a width 57 of 0. 074 inch, which is
narrow enough to fit into the socket of most Phillips
screws intended to accept a No. 1 Phillips screwdriver.
However, because the flat Phillips screwdriver blade 48
lacks a pointed end, and is thus wider at its transverse
end face 53 than a normal Phillips screwdriver, it fits
drivingly in the socket of a Phillips screw intended to
be driven by a No. 2 Phillips screwdriver. The flat
Phillips screwdriver blade 48, then, although generally
planar, can be used to function in place of either a
No. 1 or a No. 2 Phillips screwdriver.
An opening 144 iS defined in one of the side
walls 68 of the handle 36, and the tweezers 50, which
include a base portion 146 and a pair of legs 148, are
stowed generally within the cavity 52, alongside the flat
CA 022~3010 1998-11-20
19
Phillips screwdriver 48. Each of the legs 148 has a
length extending parallel with the handle 36 as shown in
FIG. 6, a thickness 150, and a width 152, indicated in
FIG. 5, so that as shown herein an outer side face 154 of
each leg 148 is located generally flush with an outer
face 156 of the side wall 68 defining the opening 144.
The provision of the opening 144 permits the width 152 of
each tweezers leg 148 to be greater than would otherwise
be possible given the overall size of the handle 36, and
it also permits each tweezers leg 148 to have an even
greater width 152 where it is acceptable for the outer
side faces 154 to protrude beyond the outer face 156.
The tweezers 50 may be made by cutting a flat
sheet of metal to include the base 146 and legs 148, and
then folding the legs 148 upward to bring the legs 148
perpendicular to the base 146 with the outer side faces
154 in a single plane. The legs 148 are thus thinner
than they are wide and are oriented with their width
generally perpendicular to the plane of the base portion
146.
The lanyard ear 54 is mounted rotatably on the
same tool pivot shaft 74 on which the base portion 146 of
the tweezers 50 is located. The lanyard attachment ear
54 is located between the base portion 146 of the
tweezers 50 and the nearer side wall 68, acting there as
a spacer to locate the base portion 146 of the tweezers
axially along the tool pivot shaft 74 on which both are
located for rotation. The lanyard attachment ear 54 is
movable selectively in the direction of the arrow 60,
between the position shown in FIG. 2 and that shown in
FIG. 13, which requires prior removal of the split ring
56 from the hole 58. In either of the positions
described, the leaf spring 76 in its normal relaxed posi-
tion extends along one of the two flat surfaces 158 and
160. Movement of the lanyard attachment ear 54 between
the two positions, however, results in a cam surface 162
between the two flat surfaces 158 and 160 being brought
CA 022~3010 1998-11-20
to bear against the leaf spring 76, which opposes such
movement. Thus, the lanyard attachment ear 54 is held
stably in the position shown in FIG. 13, resulting in the
exterior surface configuration of the folding tool 30
being generally smooth and unlikely to cause excessive
wear in a pocket of a person's clothing as a result of
carrying the tool 30.
Turning now to FIGS. 14-23, a folding multi-
purpose tool 170 includes a pair of pliers 172 equipped
with channel-shaped handles 174 which can be rotated
around the pliers jaws to house them within the cavities
192 defined by the handles 174. A plurality of other
tools are mounted in the handles 174 at the ends spaced
apart from the pliers jaws, where the additional tool
blades, such as a can opener 176, a small screwdriver
178, a Phillips screwdriver 180, and a file 182 are
selectively available or stored in one of the handles
174, while a knife blade 184, a large screwdriver 186, a
medium screwdriver 188 and a pair of folding scissors 190
are associated with the other one of the handles 174.
With all of the tool blades stored within the respective
handles 174 room remains for the pliers jaws 172 also to
be enclosed within the cavities 192. The entire tool 170
in its folded configuration presents a neat appearance
and is free from significant protrusions, so that it can
be carried as a pocket tool.
The Phillips screwdriver 180 has a flat tip 181
so that the shape is equivalent to that of the standard
No. 1 Phillips screwdriver except for effectively being
0.030 inch shorter as a result of omission of the pointed
end of the standard Phillips screwdriver shape. The
modified Phillips screwdriver 180 of the invention is
therefore able to fit deep enough into a No. 2 Phillips
screw to engage it effectively, as well as being effec-
tive for driving all but the very smallest No. 1 Phillipsscrews.
CA 022~3010 1998-11-20
Referring next to FIG. 15, it may be seen that
the folding scissors 190 are stowed between the knife
blade 184 and the medium screwdriver blade 188 in the
cavity 192 defined by the handle 174. The scissors 190
are movable from this stowed location within the cavity
192 to the deployed position shown in FIG. 16 by rotating
a first blade 194 about a tool pivot shaft 196 which may
be similar to the tool pivot shaft 74 described in
connection with the folding tool 30. When ready for use
the scissors 190 are in the position shown in FIG. 16,
and the handles 174 are located alongside each other.
As shown in FIG. 17, base portion 198 of the
first scissors blade 194 defines a bore 200 fitted about
the tool pivot shaft 196 for rotation, and is located
between a further spacer 202 and the knife blade 184. A
rocker 204 defines a bore 206 which fits around the
spacer 202. The spacer 202 is in the form of a small
ring which fits about the tool pivot shaft 196 and has an
axial thickness 208 slightly greater than the thickness
210 of the rocker 204. The spacer 202 fits closely on
the tool pivot shaft 196 between the base portion 198 of
the first blade 194 and a second spacer 212 resembling a
small flat washer. The spacer 212, which may be made
integrally with spacer 202, also fits closely on the tool
pivot shaft 196, but extends radially beyond the periph-
ery of the spacer 202, between the rocker 204 and the
knife blade 184, thus keeping the rocker 204 located
closely adjacent to the base portion 198 of the first
blade 194. The spacer 202 provides a small axial clear-
ance, about 0. 006 inch, for example, for the rocker 204,
between the spacer 212 and the base portion 198, so that
the rocker 204 remains free to rotate about the spacer
202 independent from rotation of the first blade 194
about the tool pivot shaft 196.
An operating lever 214 and a second blade 216
are attached to the first blade 194 for rotation about a
scissors pivot axis 217 defined by a rivet 218 whose
CA 022~30l0 l998-ll-20
opposite ends are countersunk in the first blade 194 and
the operating lever 214. Preferably, a preformed head
223 of the rivet 218 iS countersunk in the first blade
194 to ensure clearance between the first blade 194 and
the adjacent medium screwdriver 188, while slightly more
clearance is available for the peened outer end 215 of
the rivet 218 because of the spacer 212.
Referring to FIG. 24, it may be seen that the
rivet 218 includes a shoulder 219 larger in diameter than
the body 221 of the rivet, so that the extent of peening
the outer end 215 regulates the tension with which the
operating lever 214 iS held closely against the second
blade 216. Preferably, the operating lever 214 iS held
snugly alongside the second blade 216 SO that the operat-
ing lever is not able to swing freely with respect to the
second blade 216 yet can be moved by application of
moderate force. The preformed head 223 of the rivet 218
and the chamfered bore 225 in the first scissors blade
194 cooperate to keep the second blade 216 closely along-
side the first scissors blade 194 yet permit the blades
194 and 216 to pivot freely with respect to each other.
Excess clearance can be taken up by peening the margin of
the preformed head 223 to ensure that the blades
cooperate closely to cut in scissors fashion.
The second blade 216 includes a base portion
220 from which an integral ear 222 iS bent away from the
first blade 194 into the plane of rotation of the operat-
ing lever 214 about the axis 217, SO that movement of the
operating lever 214 in a clockwise direction as shown in
FIG. 16 brings the operating lever 214 to bear against
the ear 222. Further rotation of the operating lever 214
in a clockwise direction causes the second blade 216 also
to rotate clockwise about the scissors pivot axis 217
with respect to the first blade 194. This causes respec-
tive scissors blade cutting portions 224 and 226 to move
toward each other in a blade-closing scissors action when
the scissors are deployed as shown in FIG. 16.
CA 022~3010 1998-11-20
When the folding scissors 190 are stowed
entirely within the cavity 192, as shown in FIGS. 15 and
18, the cutting portions 224 and 226 respectively of the
first and second scissors blades 194 and 216 are in a
fully closed position with respect to each other and lie
closely against the bottom 228 of the cavity 192. A
handle tab 230 on the operating lever 214 extends trans-
versely in the direction of the blades 194 and 216. The
tab 230 provides a surface against which to push
comfortably to operate the scissors and is spaced far
enough away from the scissors pivot axis 217 that it
passes clear of the tips of the cutting portions 224, 226
and also rests against the bottom 228.
A small ear 232 is defined on the base portion
234 of the operating lever 214, and can be engaged by a
fingernail to start to move the operating lever 214 from
its stowed position. A rounded portion of the margin of
the base portion 234 is spaced away from the bottom 228
of the handle 174, allowing the operating lever 214 to be
pivoted freely about the scissors pivot axis 217, as
indicated by the broken line outline of the operating
lever 214 in FIG. 18, until a corner 236 of the base
portion 234 encounters the bottom 228. Thereafter,
further rotation of the operating lever 214 in a clock-
wise direction, with the corner 236 acting as a cam,
forces the first blade 194 to rotate away from the bottom
228 about the tool pivot shaft 196, carrying with it the
second blade 216.
The rocker 204 includes a pin 238 similar to
the pins 100 in the rockers 94 and 96 described in
connection with the folding scissors 32. The base
portion 198 of the first blade 194 also defines a hole
240 functionally similar to the slot 102 defined in the
base portions 86 of the scissors blades 80, 82 of the
folding scissors 32. The pin 238 protrudes laterally
from the rocker 204 into the hole 240, so that movement
of the first blade 194 more than a small distance moves
CA 022~3010 1998-11-20
24
the rocker 204, linked to it by the combination of the
pin 238 and the hole 240, as shown in FIGS. 19 and 20.
As the operating lever is rotated in a
clockwise direction beyond the position shown in FIG. 19
it encounters the ear 222 and pushes the base portion 242
of the second blade 216 toward and into contact with the
rocker 204. The rocker 204 prevents further movement of
the second blade 216 in a blade closing direction with
respect to the first blade 194, so that subsequent move-
ment of the operating lever 214 clockwise as shown in
FIG. 20 moves the entire folding scissors 190 clockwise
by moving the first scissors blade 194 about the tool
pivot shaft 196. The operating lever 214 thus provides
advantageous leverage for moving the folding scissors 190
to an operating position without the need to push against
the sharp tips of the blades 194 and 216.
The shape of the base portion 198 of the first
blade 194 is such that further rotation of the first
blade 194 in a clockwise direction brings the base
portion 198 into contact with a leaf spring 244 formed
integrally with the handle 174 and defined by a pair of
parallel slots 246, one on each side of the bottom 228
(see FIG. 17). With further rotation of the first blade
194, a cam surface 248 on the rocker 204, carried along
with the first blade 194 by the linking contact of the
pin 238 with the interior of the hole 240, deflects the
spring 244 further, until a handle extension stop 250,
defined on the base portion 198 of the first blade 194,
abuts against the spring 244, preventing further movement
of the first blade 194 about the tool pivot shaft 196.
The cam surface 252 on the base portion 198 of
the first blade 194, near the blade extension stop 250,
is lower than the cam surface 248 of the rocker 204, so
that the cam surface 248 presses against the spring 244
except when the blades 194, 216 are near their furthest
open position as shown in FIG. 22. The spring 244, by
pressing against the cam surface 248, urges the rocker
CA 022~30l0 l998-ll-20
204 to rotate in a clockwise direction as shown in
FIGS. 21-23. The rocker 204 iS then free to move clock-
wise relative to the first blade 194 because of the free-
dom of the pin 238 to move within the hole 240 until a
finger 254 on an outer end of the rocker 204 presses
against the base portion 234 of the second blade 216.
The rocker 204 thus urges the second blade 216 to move in
a counterclockwise direction, opening the cutting
portions 224 and 226 apart from each other toward an open
position of the scissors blades. The ear 222 of the
second blade 216 presses against the operating lever 214,
carrying the operating lever 214 along with counterclock-
wise opening movement of the second blade 216.
When the scissors blades 194 and 216 reach
their fully opened position, as shown in FIG. 22, a
blade opening stop 256 defined on the base portion 242
encounters the finger 254 which prevents the second blade
216 from moving further in a counterclockwise, opening
direction. With the blades 194 and 216 in their fully
opened position the rocker 204 iS in its furthest clock-
wise position, relative both to the base portion 198 of
the first blade 194, and to the handle 174 and the spring
244. AS the rocker 204 moves clockwise the shape of the
cam 248 allows the spring 244 to return toward its
relaxed position, and the outer end of the spring 244
slides down along the blade extension stop 250 on the
base portion 198 of the first blade 194. The spring 244
thus continues to urge the rocker 204 in a clockwise
direction and continues to urge the second blade 216 and
the operating lever 214 toward the position shown in
FIG. 22 until the scissors blades are nearly fully
opened.
To use the scissors to cut an object, it is
only necessary to push against the handle tab 230 of the
operating lever 214, urging it toward the handle 174.
This rotates the second blade 216 clockwise about the
scissors pivot axis 217 and brings the cutting portions
CA 022~3010 1998-11-20
.
26
224 and 226 closer together in a normal scissors cutting
motion. As the cutting portions 224 and 226 approach
each other a cam surface 258 of the base portion 242
pushes against the finger 254 on the outer end of the
rocker 204, urging the rocker 204 counterclockwise about
the tool pivot shaft 196, with respect to the base
portion 198, thus moving the cam lobe 248 along the
spring 244, raising the spring 244 along the blade exten-
sion stop 250 and storing energy in the spring 244 to
open the cutting portion 224 and 226 apart from each
other thereafter in preparation for a subsequent cutting
stroke.
The cam surface 258 is preferably slightly
concave, so that as the cutting portions 224 and 226
approach and reach a fully closed position the point of
contact between the cam surface 258 against the finger
254 on the outer end of the rocker 204 is further from
the scissors pivot axis 217 and closer to the tool pivot
shaft 196 than when the scissors blades are in their
fully opened position as shown in FIG. 22. As a result,
the force of the spring 244 is transmitted through the
rocker 204 to the second blade 216 with an increasing
mechanical advantage tending to open the scissors blades
apart from each other in order to avoid the possible
problem of the blades sticking against each other in a
fully closed position. The base portion 242 of the first
blade 194 encounters the rocker 204 when the blades 194
and 216 reach the fully closed position, preventing them
from passing beyond each other.
When use of the scissors has been completed, to
fold the scissors for storage within the cavity 192 of
the handle 174 it is necessary only to push against the
back of the first blade 194, moving it in a counterclock-
wise direction with respect to the handle 174. Since the
pin 238, engaged in the hole 240, links the rocker 204
with the first blade 194, moving the first blade 194
brings the rocker and its cam surface 248 similarly
CA 022~3010 1998-11-20
.
counterclockwise until the cam surface 248 and the base
portion 198 of the first scissors blade 194 are clear
from contact with the spring 244, after which the entire
folding scissors 190 can easily be swung back to the
position shown in FIG. 19. Thereafter, the operating
lever 214 may be swung further counterclockwise until the
folding scissors 190 is in the fully stowed position
shown in FIGS. 15 and 18, where the base 198 and the
rocker 204 are clear of the spring 244 so that the fold-
ing scissors 190 does not deflect the spring 244 from its
relaxed position.
When it is necessary to sharpen the scissorsblades 194 and 216 the first scissors blade can be placed
in a position such as is shown in FIG. 25, and the second
blade 216 can be moved to the position shown in FIG. 25
with respect to the first blade 194. Since the spring
244 is not in contact with either of the cam surfaces 248
and 252 the rocker 204 is free to rotate, as limited by
the pin 238 and hole 240, so that the finger 254 moves
beyond the blade opening stop 256 to the position shown
in FIG. 25. This allows the second blade 216 to move to
an open position giving an angle 260 of at least 90~
between the cutting edges 262, 264 of the two blades,
providing advantageous clearance for sharpening the
cutting edges 262, 264.
The cutting edges 262, 264 are defined by a
beveled surface 266 of the second scissors blade 216 and
a similar beveled surface 268 on the first scissors blade
194. Each of the two beveled surfaces defines a respec-
tive plane 270, 272 (FIG. 26) and each particular scis-
sors blade 194 or 216 is located completely on one side
of the respective plane 270 or 272 defined by the beveled
surface 266 or 268 of that scissors blade. As a result,
no other part of either of the scissors blades 194 and
216 interferes with engaging the respective beveled
surface 266 or 268 with a surface grinder to sharpen the
respective cutting edge 262 or 264. The beveled surfaces
CA 022~30l0 l998-ll-20
28
266, 268 are thus exposed for convenient grinding to
sharpen the edges, both before assembly of the scissors
190 and, when the assembled scissors is placed in the
position shown in FIG. 25, for resharpening after
extended use.
It will be understood that, instead of the
folding scissors 190, the tool 170 could also include
folding pliers or similar tools (not shown) operating in
a manner similar to that of the scissors 190 and includ-
ing a pair of jaws pivoted with respect to each other
about a jaw pivot axis defined by a fastener such as the
rivet 218 and movable with respect to each other by the
use of an operating lever similar to the operating lever
214. The jaws would include acting portions correspond-
ing to the cutting portions 224, 226 of the scissors
blades 194, 216, which would be urged apart from each
other by the use of a rocker corresponding to the rocker
204 acting on one of the jaws or jawlike members of such
a folding tool. The action of such a rocker, in response
to the force of a spring such as the leaf spring 244,
would urge the jaws to open ordinarily in opposition to
jaw-closing pressure exerted by the user on the operating
lever.
The terms and expressions which have been
employed in the foregoing specification are used therein
as terms of description and not of limitation, and there
is no intention, in the use of such terms and expres-
sions, of excluding equivalents of the features shown and
described or portions thereof, it being recognized that
the scope of the invention is defined and limited only by
the claims which follow.
