Note: Descriptions are shown in the official language in which they were submitted.
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I Back round of the Invention
Field of the Invention
The invention relates to a safety belt r~ up device with an
arrangement for blocking the belt reel in the event of danger,
having a release mechanism for impeding a control disk with
control teeth~preferably at the outer circumference, which disk
! is freely rotatable relative to the belt shaft. The device has
a locking arrangement which can be actuated by the control disk,
for blocking the belt reel.
! -lo- Description of the Prior Art
In safety belt roll-up devices of this type, the purpose of the
control disk is to initiate the activation of the locking device,
i.e., the blocking of the roll-up device in such a manner that
the control disk is arrested if the vehicle is decelerated, for
instance, via a mechanical release mechanism, e.g., a so-called
ball sensor. During the subsequent unwinding ~f the belt, the
belt reel and the belt shaft rotate. Great emphasis is placed
on the fact that this rotation is terminated by letting the
blocking arrangement become effective after an angular travel
distance as short as possible. To this end it is necessary that
the control disk can execute a relative motion with respect to
a predetermined starting position, Lor instance by the provision
that the control disk is under the action of a spring and can
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be resiliently deflected only in one direction, whereupon it
returns into the starting position. Such safety belt roll-up
devices are fastened in a mirrol~symmetrical arrangement to the
oppositely located vehicle frames (right and left-hand instal-
lation), so that in the last described solution, control disks
with different spring suspension would be required, which makes
among other things quantity production o~ such safety belt roll-
up devices more difficult.
Summary of the Invention
-10- An object of the present invention is to provide a safety belt
roll-up device of the type mentioned at the outset in which
only a single roll-up device type is required for right and le~`t-
hand installation.
With the foregoing and other objects in ~iew, there is providad
in accordance with the invention, a safety belt roll-up device with
belt shaft blocking means having a frame, a rotatable belt shaft on
which a belt is wound mounted in the frame, blocking means with
stationary locking teeth and a locking pawl, said pawl being movable
to engage the stationary locking teeth for blocking the belt shaft,
-20- a control disk with control teeth for activating said blocking means
to effect blocking of the belt shaft, said disk freely rotatable
relative to the belt shaft, a release mechanism which is triggered
when the vehicle exceeds a permissible acceleration or deceleration~
for impeding rotation of the control disk by contact with said con-
trol teeth, a cam mounted coaxially with the control disk with the
cam rotatable relative to the control disk in opposite directions
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of rotation, stop means to permit only a part ~urn of the cam in either
direction of rotation relative to the control disk, said cam having an actuat-
ing dog for activating the blocking means by contacting said locking pawl
when the cam and disk rotate at a speed different from the shaft causing the
pawl to move into engagement with the locking teeth, and said dog
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held in a predetermined starting position relative to the control
disk by at least one spring which can be deflected resiliently
relative to the control disk in opposite directions of rotation.
Other features which are considered as characteristic for the
invention are set forth in the appended claimsO
Although the i~vention is illustrated and described herein as
embodied in a safety belt roll-up device, it is nevertheless
not intended to be limited to the details shown~ since various
. . modifications may be made therein without departing from the
-10- spirit of the invention and within the scope and range of e~ui-
valents of the claims.
Brief DescriPt-ion of the Drawings
T.he invention, however, together with additional objects and
advantages thereof will be best understood from the following
description when read in connection with the accompanying drawings,
in ~hich:
FIG. 1 diagrammatically illustrates in a slde view the
safety belt roll-up device showing release mechanism control
disk, and locking means,
-20-FIG. 2 is a partial cross section of the safety belt roll-up
device taken along line II-II of FIG. 1,
FIGS. 3 and 4 illustrate a first embodiment of the control
disk of the safety belt roll-up device according to the invention
in two different positions of operation, i.e. in normal position
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and activated position,
i FIG. 5 is a sectional view of the control disk taken along
line III-III of FIG. 3,
FIG. 6 is a variant of FIG. 5,
FIGS. 7 and 8 illustrate a second embodiment of the control
disk of the safety belt roll-up device according to the invention
in two different positions of operation,
FIG. 9 schematically shows a third embodiment of the control
disk,
-10- FIGS. 10 and 11 schematically illustrate a fourth and fi~th
embodiment of the control disk, and
, ~IG. 12 shows the loop from FIG. 11 in detail.
Detailed Description of Invention
Accordin~ to the invention, the control disk is associated co-
axially with a cam which is rotatable relative to the control disk.
The cam has an actuating dog for the locking device and is held
in a predetermined starting position relative to the control dis~
by at least one spring and can be deflected resiliently in opposite
directions of rotation relative to the control disk. In this
manner, a single type of roll-up device can be used for right-
-20- and left-hand installation, since the control disks can be de-
~ flected resiliently in both possible directions of rotation and,; when released, automatically returns to the starting position.
In an embodiment of the safety belt roll-up device according to
the invention, which is particularly simple as far as assembly is
concerned and saves space, the cam is mounted freely rotatably
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on a bearing hub Or the control disk and ls axially secured by a
stop, preferably by a resilient pro,jection which can be hooked
; into a concentric circular slot in the hub. In this manner, the
cam can be snapped onto the bearing hub of the control disk with-
out effort in the assembly, so that no separate stop elements are
required for securing same in the axial direction.
According to a further embodiment of the invention, the control
disk and the cam are provided with recesses which face each
- other and together form one or several coaxial and arc-shaped
-10- receiving channels LOr the springs. Radially or axially aligned
stops of the control disk and the cam are provided in the ~icinity
ol the channels. The stops are held in the alignment or starting
position by spring force.
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The radially aligned stops of the control disk and the cam are
preferably tensioned against each other by the free, projecting
spring legs of a loop spring mounted on an axial hub part. This
solution permits particularly large control distances.
In FIGS. 1 and 2, the housing 1 of a safety belt roll-up device
made of a stable material, consists basically of two side plates
-20- 2 and a cross piece 3. Rotatably mounted in the side plates 2,
of which only one is shown in the figures, is the belt shaft 4
which projects beyond the side plate 2 and has a planar radial
end shoulder 5 as well as a thin cylindrical journal pin 6. The
safety belt wound on the belt shaft 4 is designated by numeral 7.
~astened to the outside surface of the side plate 2 is a ratchet
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gear 9 with internal ratchet teeth 10. A two-arm rat¢het pawl
- 11 on a bearing pin 12 is pivoted eccentrically to the belt shaft
at the end ~ace extension 5 of the belt shaft 4. In FIG. 1 the
upper locking edge of this ratchet pawl 11 is pushed by a spring
13 toward the belt shaft. For the sake of clarity, a control
disk 14 is shown only dashed in FIG. 1 and an inertial disk 15
connected to the ~ontrol disk is not shown. The inertial disk
15 (FIG. 2) has a bearing extension 16 with a bearing hole. The
bearing extension 16 carries integrally therewith a control dog
-10- 18. The-control disk 14 provided with a corresponding bearing
opening can be pushe~ with a positive engagement onto the bearing
extension 16 and the control dog 18. The unit of control disk 14/
; inertial disk 15 is rotatably mounted relative to the belt shaft
4 on the journal pin 6 of the belt shaft 4. The control disk
14 has radial, narrow control teeth 20 which agree as to pitch
and number of teeth with the ratchet teeth 10. A release mechanism
designated generally by numeral 21 is in the form o~ a so-called
ball sensor, consisting of a base plate 22 fastened to the hous-
ing o~ the automatic device, with a centering hole 23, a ball
-20- 24 and a tiltable control lever 25 lightly supported on the ball
24. The release mechanism 21 is ac~uated in the event of an
excessive deceleration o~ the vehicle. Then, the ball 24 moves
outside the area of the centering hole 23 with the result that the
control lever 25 is pushed upward. This stops the control disk
14. The sa~ety belt 7 is unwound slightly until the control dog
18 runs up on the inside surface o~ the ratchet pawl 11 due to
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¦ the relati~e motion between the belt shart 4 and the control¦ disk 14. The ratchet pawl 11 theb pushes against the ratchet
teeth 10.
In the following, control disks which are different from the
control disk according to FIGS. l and 2 are explained.
- , In ~he embodiment example according to FIGS. 3, 4 and ~, the con-
trol unit 30 has a ~lat control disk 32 with control teeth 31
-arranged at its outer circum~erence and also has a bearing hub
33 with a concentric circular groove 34 as well as a collar 35.
-10- A circular recess 36 is provided in part of the collar 35. As
clearly shown in FIGS. 3 and 5, a flat cam 37 is mounted freely
rotatably on the bearing hub 33. This cam 37 has a resilient
projection 38 which can be hooked resiliently into the concentric
circular groove 34 when the cam is placed on the bearing hub,
thereby axially securing the cam. The cam 37, similar to the
control disk 32, also has a circular-arc-shaped recess 39. The
recesses 36, 39 o~ the control disk and the cam, radially of~set
from each other, form a closed receiving channel 36/39 for a
compression spring 40. The shoulders of the recesses 36 and 39,
-20- terminating the circular arc of the receiving channel at both
ends, form radially aligned stops 41~ 42 and 43, 44, which are
tensioned against each other by the two ends of the spring 40
contained in the receiving channel 36/39. When the release
mechanism 21 becomes eifective and gets into the blocking position,
it locks the control disk 32 by contact at the control teeth 31
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! The initial or starting position is shown in FIG. 3, while in
FIG. 4 that position is shown in which some belt 7 wa unwound
fr~m shaft 4 and the blocking of the automatic device, i.e.,
the blocking of the belt shaft 4, completed. It is seen clearly
that in this process the stops 41 and 42, 43 and 44 of the control
disk and the cam have shifted clockwi~ relative to each other by
the angle a. With the release of the control unit 30, i.e. it
- ~ is no longer activated by release mechanism 21, the tensioned
spring 40 again brings the corresponding stops into alignment
-10- (starting position). While the control unit 30 was being actu-
ated, the ratchet pawl designated with 11 in FIGS. 1 and 2 was
moved into the locking position by means of the control dog 46
o~ the cam 37. The ~igures also clearly show that due to the
particular manner of arranging the spring 40, a deflection of
! the cam 37 counterclockwise is also possible. Thereafter, upon
release, the stops get into mutual alignment again.
The embodiment example according to FIG. 6 dif~ers ~rom the
embodiment example according to FIGS. 3 to 6 in that the control
disk 32' and cam 37' are provided with ~xially opening recesses
-20- 36' and 39' as well as with axially aligned stops Ior the spring
40'.
In the embodiment example according to FIGS. 7 and 8, there is
located, on both sides o~ each of th0 stops 47 and 48 of the con-
~ trol disk 49 and the cam ~0, a circular-arc-shaped receiving
, channel 51 and channel 52 for receiv~ng a spring 53 each. The
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springs ~3 are braced against the radially aligned stops 47~
48 as well as at the other end against the corresponding shoulders
54 defining the receiving channels, of the cam ~0. Here, too,
a relative motion of the control disk and the cam, for instance,
by the angle a clockwise as well as counterclockwise is possible,
as shown in FIG. 8. The stops 47 and 48 are pushed back into
their alignment or starting position aIter the load ceases.
In the embodiment example according to FIG. 9, annular recesses
~re provided in the control disk 55 and the cam 56, which form
an annular receiving channel 57 of the control disk 55 and the
cam 56, with the exception of the stops 58, 59, arranged in the
area of the receiving channel 57 and radially aligned with each
other. Tbe spring end~ of a single spring 60, bent in the form
of a ring, are braced against these stops.
In the embodiment example according to FIG. 10~ a control disk
61 has a stop 63 which projects into a recessed cavity 62, while
the cam 64 which is coaxial with the control disk 61 and cooper-
ates therewith, has a stop 65 facing the stop 63. Mounted on
a hub part or on the outer circumference o~ the cam 64 is a
formed spring 66 with two radially projecting ~ree spring legs
66' and 66", which are braced against the radially aligned
stops 63 and 65 and tension them against each other. Here too,
-a relative motion in both directions of rotation is possible,
the dash-dotted lines indicating the actuated position of the
cam a~ter a relative motion.
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In the embodiment example according to FIGS. 11 and 12, a loop
spring 67, shown as a detail in FIG. 12, is molmted on a hub
part of the cam 68 with several spring turns instead of the formed
spring according to FIG. 10. The freely projecting spring legs
67l and 67" tension the stops 69 and 70 of the cam 68 and the
control disk 71 against each other. Here, too, the deflected
position of the cam 63 or the stop 70 of the cam 68 is indicat-d.
,
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