JPH0335651Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a webbing lock release mechanism that disengages a pawl that engages with the ratchet wheel and prevents rotation in the webbing pull-out direction from the ratchet foil in the event of a vehicle emergency.

[Prior art]

Currently, a locking mechanism is installed in the retractor of a vehicle seat belt device to prevent rotation of the webbing in the pull-out direction by a sudden increase in the tension of the webbing in the event of a vehicle emergency, thereby reliably restraining the occupant.

This is because two ratchet foils coaxially fixed to the take-up shaft near both ends of the webbing widthwise engage the pole, which is usually separated from the wheels, by the action of an acceleration sensor, causing the take-up shaft to rotate in the webbing pulling direction. It is designed to prevent

Such a lock mechanism is structured so that when the tension of the webbing decreases, the lock is automatically released and the retractor is in the same state as before the vehicle emergency (the ratchet and pole are separated). ing.

However, if the vehicle rolls over, the pawl remains engaged with the ratchet wheel, which may prevent the door from opening, especially in vehicles equipped with some types of automatic seat belt devices. Therefore, some winding devices are equipped with a release lever for forcibly and manually separating the pole from the ratchet wheel.

However, although the pawl is engaged with two ratchet foils, this release lever contacts the pawl at only one point to apply driving force.

For this reason, the force applied by the release lever to the pawl becomes uneven, causing the stroke of the release lever to become larger.

The present invention takes the above-mentioned facts into account, and aims to provide a webbing lock release mechanism that can apply even force to the release lever pole and smoothly release the release lever.

[Means for solving problems]

The webbing lock release mechanism according to the present invention includes a pawl that engages with first and second ratchet wheels pivotally attached to the take-up shaft in the event of a vehicle emergency to prevent rotation of the take-up shaft in the webbing pull-out direction;
A sub-lever is engageable in the vicinity of the meshing part with the ratchet foil and disengages the pawl from the first ratchet foil, and a sub-lever is engageable in the vicinity of the meshing part of the pawl with the second ratchet foil and receives the drive to move the pawl from the second ratchet wheel. It releases the ratchet from the foil and transmits this driving force to the sub-lever.
and a release lever for releasing the pole from the ratchet foil with a force equal to the releasing force.

Therefore, even when the pawl is strongly engaged with the ratchet foil, the sub-lever is engaged in the vicinity of the part where the pawl engages with the first ratchet foil, and the release lever is engaged in the vicinity of the part where the pawl engages with the second ratchet foil. The pole can be smoothly separated from the first and second ratchet foils.

[Configuration of Example]

1 and 2 show an embodiment of a winding device 12 to which a webbing lock release mechanism 10 according to the present invention is applied. This retractor 12 is used for an automatic seat belt device and is installed near a center console (not shown) of a vehicle.

A frame 14 of this winding device 12 is bent into a U-shape and is provided with leg plates 16 and 18 parallel to each other.

Coaxial circular holes 2 are provided in these leg plates 16 and 18.
0 and 22 are provided, and the vicinity of both ends of the winding shaft 24 are pivotally supported. One end of the webbing 26 is locked to the middle part of the take-up shaft 24, and the webbing 26
6 is wound around this winding shaft 24 in a layered manner. The center portion of the webbing 26 is used as a mounting portion for the occupant, and the other end portion is latched to an anchor plate (both not shown) that is movable along a guide rail installed on the vehicle roof or the like.

As a result, when the occupant sits on the seat, the anchor plate moves toward the rear of the vehicle along the guide rail, allowing the occupant to wear the webbing 26.

First and second ratchet foils 28 and 29 are fixed to the winding shaft 24 near both ends in the width direction of the webbing 26 wound in layers, respectively, and rotate together with the winding shaft 24.

Further, the inner end of a mainspring spring 30 is locked to the end of the winding shaft 24 protruding from the leg plate 16.
Furthermore, the outer end of this mainspring spring 30 is locked to a spring cover 32, and by fixing the spring cover 32 to the leg plate 16 with screws or the like (not shown), the winding shaft 2
4 is biased to rotate in the direction in which the webbing 26 is wound up.

As shown in FIG. 1, fan-shaped holes 33 are provided above the circular holes 20 and 22 of the leg plates 16 and 18 that pivotally support the winding shaft 24, respectively. Narrow width portions 34A, 34
B is inserted. Wide part 34C of pole 34
Near both ends of are the first and second ratchet foils 2.
8, 29 and corresponding blade portions 36, 36.

As a result, the pawl 34 rotates along the arc of the fan-shaped hole 33, and the blade portions 36, 36 can engage and separate from the first and second ratchet wheels 28, 29. The pawl 34 is normally supported apart from the first and second ratchet wheels 28 and 29 by the biasing force of an elastic body (not shown), and in the event of a vehicle emergency, the sensor lever is tilted by an acceleration sensor (not shown), and the pawl 34 is By rotating, the first and second
It engages with the ratchet wheels 28 and 29 to prevent the take-up shaft from rotating to draw out the webbing.

Further, in the middle part of the pawl 34, a drawn concave part 38 is formed in a concave direction in a direction away from the layered webbing 26, and a part of the sub-lever 40 and the release lever 42 are inserted therein.

A bent portion 44 bent toward the back of the paper in the second drawing is formed on the lower end surface of the sub-lever 40, and one longitudinal end is formed with a connecting portion 46 with the release lever 42.
It is becoming.

Further, the intermediate portion of the sub-lever 40 is connected to a pin 50 which is connected to a tie bar 48 (not shown in FIG. 2) which is connected to and fixed between the frame 14 and the leg plates 16 and 18. supported.

The bent portion 44 is inserted into the vicinity of the end of the recessed portion 38 on the first ratchet 28 side. Note that the bent portion 44 and the connecting portion 46 are at the same distance from the pin 50.

As a result, when a force is applied to the connecting portion 46 in the direction of arrow A in FIG.
The same force applied to the first ratchet 28 in the direction of arrow A causes the pawl 34 to dissociate from the first ratchet 28 (in the direction of arrow B).

Like the sub-lever 40, the release lever 42 has an intermediate portion spanned between the frame 14 and the diver 48 and is pivotally supported by a pin 52 that is pivoted.

A bent portion 54 is formed on the lower end surface of the release lever 42 and is bent toward the back side of the paper in the second drawing, and is inserted into the vicinity of the end of the recessed portion 38 on the second ratchet 29 side.

The release lever 42 also has this bent portion 5.
A handle portion 56 extending from the pin 52 is integrally provided, and the end of the pin 52 opposite to the handle portion 56 has a concave shape disposed above the connecting portion 46 of the sub-lever 40 to accommodate the connecting portion 46. This is a driving force transmission section 58 . The drive transmitting portion 58 and the bending portion 54 are at the same distance from the pin 52, similarly to the sub-lever 40.

Here, when the handle portion 56 of the release lever 42 is pulled up in the direction of arrow C in FIG.
2 rotates clockwise in FIG. 2 around the pin 52,
The bend 54 is adapted to release the pole 34 from the second ratchet foil 29 (in the direction of arrow D). At the same time, the driving force transmitting section 58 applies a force in the direction of arrow A to the connecting section 46 of the sub-lever 40 with the same force as in the direction of arrow D.

A tension coil spring (not shown) is attached between the handle portion 56 of the release lever 42 and the leg plate 18, so that the release lever can be rotated counterclockwise in FIG. 2 with a weak biasing force. The receiving protrusion 59 and the leg plate 18 are in contact with each other.

Further, the sub-lever 40 is also subjected to a weak urging force of clockwise rotation in FIG. 2 by a torsion coil spring (not shown) attached to the pin 50, and as a result,
The driving force transmitting portion 58 and the connecting portion 46 are always in contact with each other.

Therefore, the release lever 42 and the sub lever 40
In both cases, there is no interference with the movement of the pole 34, and vibration noise caused by vehicle vibration is also prevented.

[Effect of the embodiment]

Under normal vehicle running conditions, the pole 34 is the first
Since the webbing 26 is separated from the second ratchet wheels 28 and 29, the occupant can assume any driving position by pulling out the webbing 26 from the take-up shaft 24 or winding it onto the take-up shaft 24.

When the vehicle is in an emergency situation, an acceleration sensor (not shown) engages the pawl 34 with the first and second ratchet wheels 28, 29 to stop the webbing pull-out rotation of the take-up shaft 24. At the same time, a large tension is applied to the webbing 26 due to the inertial force generated on the occupant.

When the emergency state of the vehicle ends, the pawl 34 is separated from the first and second ratchet wheels 28 and 29 by the biasing force of an elastic body (not shown), and the first and second ratchet wheels 28 and 29 are again able to rotate.
If the vehicle rolls over, the pole 34 is the first
The pawl 34 is strongly engaged with the second ratchet foils 28 and 29, and the pawl 34 is tightly engaged with the second ratchet foils 28 and 29.
You may not be able to move away from 8 and 29.

To release the lock in this state, the occupant pulls up the release lever 42 in the direction of arrow C in FIG. 2.

This causes the release lever 42 to rotate clockwise in FIG. 2 about the pin 52. Due to this rotation, the bent portion 54 inserted into the concave portion 38 of the pole 34 moves in the direction of arrow D in FIG.
can be forcibly separated from the second ratchet foil 29.

At the same time, when the release lever 52 rotates clockwise, the driving force transmission section 58 pushes down the connecting section 46 of the sub-lever 40 with the same force as in the direction of arrow D (in the direction of arrow A).

When a force is applied to the connecting portion 46 in the direction of arrow A in FIG. 2, the sub-lever 40 rotates counterclockwise around the pin 50.

Due to this rotation, the bent portion 44 inserted into the concave portion 38 of the pawl 34 moves in the direction of the arrow B with the same force as in the direction of the arrow A, and the pawl 34 can be forcibly separated from the first ratchet foil 28.

That is, by pulling up the release lever 42, the bent portion 54 pushes up the vicinity of the second ratchet foil 29 of the pawl 34, and the bent portion 44 pushes up the vicinity of the first ratchet foil 28 of the pawl 34 simultaneously with the same force (in the direction of arrow D). (the force in the direction of arrow B is equal), an average force is applied to the pawl 34, and even if the pawl 34 is strongly engaged with the first and second ratchet foils 28, 29, the first and second ratchet foils 28, It can be dissociated from 29. Therefore, even if the rigidity of the pole 34 is reduced, it will not become difficult to separate, and the pole 34 can be formed from a thin steel plate that is lightweight and easy to process.

In addition, in this embodiment, the connecting portion 4 of the sub-lever 40
6 is housed in a concave driving force transmitting portion 58 formed in the release lever 42, but as shown in FIG. It may be inserted into the elongated hole 62 and connected.

In this case, the distance from the pin 52 to the bent portion 54 and the distance from the pin 52 to the pin 60 of the release lever 42 are made equal to each other so that the force applied in the direction of arrow B and the direction of arrow D are the same. The distance from the pin 50 to the bent portion 44 and the distance from the pin 50 to the pin 60 are set to be equal distances.

Therefore, when the handle portion 56 is operated and a force in the direction of arrow C is applied, the release lever 42 rotates clockwise and applies a force in the direction of arrow D to the bent portion 54, and at the same time is inserted into the elongated hole 62. A force in the direction of arrow A that is the same as that in the direction of arrow D is applied to the pin 60.

As a result, the sub-lever 40 rotates clockwise, and the same force in the direction of arrow B as in the direction of arrow A can be applied to the bent portion 44.

Further, in this embodiment, the driving force for lifting up the handle portion 56 of the release lever 42 is manually applied, but the same effect can be obtained by using a mechanical force such as a solenoid valve.

Furthermore, in this embodiment, the distance between the pin 52 and the bent portion 54 in the release lever 42 and the pin 5
2 and the driving force transmitting portion 58, and the distance between the pin 50 and the bent portion 4 of the sub-lever 40 is made equal.
4 and the distance between the pin 50 and the connecting portion 46 were made equal, but the distance between the release lever
The distances do not need to be made equal if the point of application of the force is changed, such as by adjusting the leverage ratio, so that the same force is applied to the bent portions 54 and 44 by operation in the direction of arrow C in the figure.

[Effect of idea]

As explained above, the webbing lock release mechanism according to the present invention includes a pawl that engages with the first and second ratchet wheels fixed to the take-up shaft to prevent the take-up shaft from rotating in the webbing pull-out direction in the event of a vehicle emergency;
a sub-lever that is engageable near the engaging portion of the pawl with the first ratchet foil and for disengaging the pawl from the first ratchet foil; and a sub-lever that is engageable near the engaging portion of the pawl with the second ratchet foil and receives driving force. and a release lever that releases the pawl from the second ratchet foil and transmits this driving force to the sub-lever to release the pawl from the first ratchet foil with the same force as the releasing force, thereby reducing the force of the release lever on the pawl. It has excellent effects in that it can be applied evenly and the pole can be smoothly separated from the ratchet foil.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a winding device to which a webbing lock release mechanism according to the present invention is applied, FIG. 2 is a front view of a winding device according to this embodiment, and FIG. 3 is a diagram showing another embodiment. It is a front view of a winding device. 10...Webbing lock release mechanism, 24...
Winding shaft, 28...First ratchet foil, 29...
...Second ratchet foil, 34...Pole, 40
...Sub lever, 42...Release lever.

Claims (1)

[Scope of utility model registration request] A pawl that engages with first and second ratchet foils fixed to the take-up shaft in the event of a vehicle emergency to prevent rotation of the take-up shaft in the webbing pull-out direction; and a pawl that is engageable in the vicinity of the meshing portion of the pawl with the first ratchet foil. A sub-lever for disengaging the pawl from the first ratchet foil is engageable near the meshing portion of the pawl with the second ratchet foil, and receives a driving force to dissociate the pawl from the second ratchet foil, and transmits this driving force to the sub-lever. a release lever that transmits a force to the first ratchet foil and releases the pole from the first ratchet foil with a force equal to the releasing force.