JPH0323399Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is used in a seat belt device for protecting occupants in a vehicle emergency, and is a winder that supports a lock bar to stop the rotation of a winding shaft in a vehicle emergency. This invention relates to a lock bar support structure for a device.

[Conventional technology]

In the seat belt device, one end of the webbing for restraining an occupant is wound onto a winding device. In this winding device, one end of the webbing is wound onto a winding shaft, and a ratchet wheel fixed to the winding shaft engages with a lock bar in the event of a vehicle emergency, thereby stopping the webbing from being pulled out.

FIG. 3 shows that after the occupant has attached the webbing, the lock bar 10 is biased toward the ratchet wheel 12, thereby stopping the webbing pull-out rotation of the take-up shaft 14 in the event of a vehicle emergency, and the webbing 16 is stopped.
A winding device (referred to as an automatic locking winding device, ALR) is shown, which restrains an occupant by locking the vehicle.

In this winding device, substantially triangular shaft support holes 24 are provided in the leg plates 20 and 22 provided on both sides of the frame 18.
26 are formed respectively, and the lock bar 10
One end of the shaft is brought into contact with the triangular vertices of the shaft support holes 24 and 26, and the shaft is pivotally supported around the triangular vertices.

A torsion coil spring 28 is stretched between one end of the lock bar 10 and the leg plate 20, thereby biasing one end of the lock bar 10 toward the triangular apex of the shaft support hole 24 (in the direction of arrow A) and It is biased toward one side of the support hole 24 (in the direction of arrow B) and engages with the ratchet wheel 12.

However, due to the biasing force of the torsion coil spring 28, the lock bar 10 is biased toward the base of the triangle (in the direction of arrow C) on the portion that is pivoted to the shaft support hole 26 on the opposite side. Therefore, in order to accurately maintain the center of rotation of the lock bar 10, it is necessary to maintain the inner diameter dimensions of the shaft support holes 24 and 26 accurately. However, since the frame 18 is formed from a thick plate material by press punching, it is difficult to maintain accurate dimensions, and a grinding operation or the like is required after pressing.

Furthermore, by extending the torsion coil spring 28 between the other end of the lock bar 10 and the leg plate 22, it becomes possible to accurately maintain the center of rotation of the lock bar 10. However, one leg plate has a winding shaft 14.
Since a mainspring spring is arranged to bias the torsion coil spring 28, it is generally not possible to secure a space for arranging the torsion coil spring 28.

[Problem that the invention attempts to solve]

In consideration of the above facts, the present invention aims to provide a lock bar support structure for a winding device that can easily improve the accuracy of the rotation center of the lock bar and improve the operability of the lock bar.

[Means for solving problems]

The lock bar support structure for a take-up device according to the present invention is a lock bar support structure for a take-up device in which the vicinity of both ends of the lock bar is pivotally supported in the shaft support holes formed in a pair of frame leg plates, and includes a shaft portion. The lock bar is characterized in that the lock bar is pivotally supported via a bush that is pivotally supported by the pair of frame legs by a shaft portion.

[Effect]

The lock bar support structure for a winding device having the above structure includes a shaft portion, and the lock bar is pivotally supported by the shaft portion via a bush that is swingably supported by the pair of frame legs. Therefore, the lock bar is positioned by the bush and swings about the shaft of the bush. Therefore, by increasing the accuracy of the diameter of the shaft of the bushing and the position and diameter of the hole in the frame leg into which the shaft of the bushing is inserted, it is possible to easily increase the precision of the center of rotation of the lock bar. This improves the operability of the lock bar.

〔Example〕

As shown in FIGS. 1 and 2, the frame 30 is formed from a thick plate and is fixed to the vehicle body with mounting bolts (not shown).

Leg plates 32 and 34, which are bent at right angles from both sides of the frame 30 and extend parallel to each other, are coaxially formed with circular holes 36 and 38, in which a winding shaft 40 is pivotally supported. One end of an occupant restraining webbing 42 is wound around the winding shaft 40 in a layered manner at an intermediate portion thereof, and the other end of this webbing 42 is attached to other parts of the vehicle body, and the intermediate portion of the webbing 42 It serves as a mounting part.

A pair of ratchet wheels 44 are fixed to the winding shaft 40 on both sides of the webbing 42 so as to rotate together with the winding shaft 40. Corresponding to these ratchet wheels 44 are lock bars 46 which are pivotally supported on the leg plates 32,34. The lock bar 46 is inserted into and pivoted into pivot holes 48, 50 formed in the leg plates 32, 34 near both ends thereof.

The shaft support hole 48 has a substantially triangular shape, and the lock bar 46 rotates around the apex 48A thereof.
The shaft support hole 50 has an arc shape centered on the bush shaft support hole 70, and the lock bar 46 rotates around the bush shaft support hole 70. This rotation causes the lock bar 46 to engage with the ratchet wheel 44, thereby stopping the webbing pull-out rotation of the take-up shaft 40.

One end 4 of the lock bar 46 protruding from the leg plate 32
A bush 72 is fitted into 6A. A shaft 74 is integrally formed with the bush 72, and this shaft 74 is inserted into the bush shaft support hole 70 and is supported.

The other end 4 of the lock bar 46 protruding from the leg plate 32
6B has a torsion coil spring 52 between it and the leg plate 32.
is spanned over, and the lock bar 46 is urged to rotate in the direction of engagement with the ratchet wheel 44.

Further, a control mechanism (not shown) is provided on the outside of the leg plate 32 so that the lock bar 46 can be engaged with the ratchet wheel 44 only after the occupant has attached the webbing.

This control mechanism, for example, allows the occupant to
Lock bar 46 until you pull out 2 by a predetermined length.
The movement of the webbing 42 is restrained to maintain a separation state from the ratchet wheel 44, and the crew member pulls the webbing 42 by a small amount onto the take-up shaft 4 in order to attach the webbing 42.
0, the reverse rotation of the winding shaft 40 is detected and the lock bar 46 is moved to the ratchet wheel 44.
This is a general configuration that can be controlled so that it can be engaged with the other parts.

A slit 57 is formed at one end of the winding shaft 40 protruding from the leg plate 34, and the inner end of a mainspring spring 58 is locked into this slit 57. The mainspring spring 58 is housed in the accommodation recess 62 of the spring cover 60, and its outer end is inserted and locked into a locking groove 64 formed in a part of the accommodation recess 62. As a result, the winding shaft 40 receives a rotational force in the webbing winding direction.

The spring cover 60 is attached to the leg plate 34 by inserting a plurality of pins 66 protruding from the side into insertion holes 68 of the leg plate 34.

Note that a slit 80 is extended in a part of the shaft support hole 48, and the lock bar 46 is inserted into the shaft support holes 48, 50.
It can be easily accommodated inside.

In the winding device of this embodiment configured in this way, the vicinity of one end 46B of the lock bar 46 to which the torsion coil spring 52 is attached is biased in the direction of arrow A by the biasing force of the torsion coil spring 52.
Therefore, it comes into contact with the top portion 48A of the shaft support hole 48, and the vicinity of this contact portion becomes the center of rotation. The opposite end 46A is biased in the direction of arrow C, but since the shaft 74 of the bush 72 is supported by the bush shaft support hole 70, the lock bar 46 is spaced apart toward the inner periphery of the shaft support hole 50. Retained.

Therefore, the center of rotation of the lock bar 46 is at a fixed position, and the lock bar 46 rotates smoothly when subjected to an operating force from the control device.

After the occupant has attached the webbing 42, the lock bar 46 is moved to the ratchet wheel 44 by pulling out the webbing 42 by moving the occupant's upper body.
However, the lock bar 46 receives a load from the shaft support hole 5.
0, the inner peripheral portion of the shaft support hole 50 will not be scratched due to repeated contact with the shaft support hole 50. This also ensures that the lock bar 46 always rotates smoothly.

In the event of a vehicle emergency, the large tension generated in the webbing 42 is transmitted to the lock bar 46 via the ratchet wheel 44. Therefore, the bush 72 is deformed, and the lock bar 46 comes into contact with the inner periphery of the shaft support hole 50, so that this high load can be reliably supported.

In the above embodiment, a winding device is shown in which the lock bar 46 is always biased in the direction of meshing with the ratchet wheel 44 when the occupant is wearing the webbing.
2 is not provided, and the present invention is also applicable to a winding device having an acceleration sensor that engages the lock bar 46 with the ratchet wheel 44 only in case of a vehicle emergency.

[Effect of idea]

As explained above, in the lock bar support structure for a winding device according to the present invention, the lock bar is pivotally supported via a bush which is provided with a shaft portion and is pivotably supported by a pair of frame legs. Therefore, the accuracy of the rotation center of the lock bar can be easily increased, and the operability of the lock bar can be improved, which is an excellent effect.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a winding device to which the lock bar support structure for a winding device according to the present invention is applied;
This figure is an exploded perspective view showing the main parts of this embodiment, and FIG. 3 is an exploded perspective view showing a conventional lock bar support structure for a winding device. 30... Frame, 32... Leg plate, 34... Leg plate, 42... Webbing, 44... Ratchet wheel, 46... Lock bar, 48... Pivot hole,
50... shaft support hole, 70... bush shaft support hole, 72
...butsuyu, 74...axis.

Claims (1)

[Scope of utility model registration request] A lock bar support structure for a take-up device in which the vicinity of both ends of a lock bar is pivotally supported in shaft support holes formed in a pair of frame leg plates, and the lock bar support structure includes a shaft portion and allows the pair of frame leg plates to be swung by the shaft portion. A lock bar support structure for a winding device, wherein the lock bar is pivotally supported via a movably pivotally supported bush.