JPS607972Y2 - webbing retractor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a webbing take-up device used in a seat belt device for restraining and protecting an occupant in a vehicle emergency.

In the seat belt device, the occupant wears a webbing for restraining the occupant, and in the event of a vehicle emergency, the occupant is restrained by the webbing and safety is guaranteed.

In addition, one end of this webbing is wound onto the winding shaft of the webbing winding device by a biasing force, and in case of a vehicle emergency, the webbing is wound up on the winding shaft by engaging a ratchet foil fixed to the winding shaft with a pole. Rotation is stopped, so that the occupant can arbitrarily change the length of the webbing during normal driving, but in the event of a vehicle emergency, the occupant will be reliably restrained by the webbing.

Further, in a seat belt device in which one end of the webbing is locked to a door for getting on and off, the webbing can be automatically attached to the occupant in accordance with the circular motion of opening and closing the door.

However, in such a seat belt device, when considering the case where the occupant escapes from the vehicle after a vehicle collision, the webbing is easily unwound from the take-up shaft when the occupant escapes, increasing the length of the webbing and increasing the distance between the occupant and the occupant. It is preferable that the webbing can be easily released by forming a sufficient gap.

For this reason, a webbing take-up device has been proposed that is provided with a release lever that forcibly separates the pawl from the ratchet wheel when necessary.

With this retractor, the webbing can be freely unwound from the retractor by the occupant operating the release lever after a vehicle collision, making escape easier; however, the pole still remains ratcheted when the occupant reboards. Since the vehicle remains separated from the wheel, it is not possible to restrain the occupant after re-boarding in the event of a subsequent vehicle emergency, which could lead to an extremely dangerous situation.

The present invention takes the above facts into consideration, and even when the occupant operates the lever as necessary to forcibly separate the pole from the ratchet wheel, allowing the webbing to unwind and rotate freely.
It is an object of the present invention to provide a webbing retractor in which the pawl can be engaged with the ratchet wheel again by a subsequent webbing retracting operation, thereby improving the safety of the occupant.

The webbing take-up device according to the present invention is provided with a hook that maintains the engaged state of the release lever that is engaged with the pawl in order to separate the pawl from the ratchet wheel, and the webbing is disposed between the hook and the webbing take-up shaft. A holding/release mechanism is provided that moves the hook as the winding rotates, allowing the release lever to disengage from the pole, and immediately returns the pole to a state where it can be engaged with the ratchet foil when the webbing is winding and rotating. It has a structure that allows

Embodiments of the present invention will be described below with reference to the drawings.

In Figures 1 and 2, a webbing winding device 1 according to the present invention is shown.
0, the frame 12 is fixed to the vehicle body 16 with mounting bolts 14.

Legs 1 bent at right angles from both ends of this frame 12
8.20 are parallel to each other and pivotally support the winding shaft 22.

This winding shaft 22 winds up the webbing 26 by the biasing force of a mainspring spring winding device 24 attached to the outside of the leg portion 18.

(direction of arrow A).

The other end (not shown) of the webbing 26 is attached to the vehicle body via the passenger seat, and the intermediate portion is used for mounting by the passenger.

Therefore, the crew member should pull the webbing 26 onto the mainspring winding device 2.
If the winding shaft 22 is pulled out against the biasing force 4, the amount of winding of the webbing 26 is reduced and the length of the webbing 26 can be changed (rotation in the direction of arrow B).

A ratchet wheel 28 is fixed to each winding shaft 22 on the inside of the leg 18.20, and faces the tip 32 of a pawl 30 which is pivoted on the leg 18.20.

This pole 30 has an acceleration detection device 34 using a pendulum or the like attached to the outside of the leg portion 18, and in the event of a vehicle emergency, it is rotated so that the tooth tip 32 engages with the ratchet wheel 28, and the ratchet wheel 28 and the winding shaft 28 are rotated. The webbing unwinding rotation is stopped.

A bracket 36 is attached to the leg portions 18, 20 in parallel with the frame 12, and an intermediate portion of the release lever 40 is pivoted to a pin 38 that is pivoted between the bracket 36 and the frame 12. has been done.

This release lever 40 has three arms 42 centered around the pin 38. 44. 46 pieces project in the radial direction.

A knob 48 is attached to the tip of the arm 42, and the occupant can operate this knob 48 to rotate the release lever 40 around the pin 38 and engage the arm 44 with the pole 30. There is.

This arm 44 contacts the force-receiving piece 50 on the opposite side of the tooth tip 32 of the pawl 30 via a fulcrum, so that the pawl 30 can be rotated and the tooth tip 32 can be forcibly separated from the ratchet wheel 28. It has become.

Here, a torsion coil spring 52 is interposed between the arm 42 and the frame 12, and the release lever 40 is urged to rotate so that the arm 44 is spaced apart from the force receiving piece 50 (see Figs. 3 and 4). reference).

On the other hand, the arm 46 projects near the top of the leg 20, and when the arm 46 is engaged with the pawl 56 of the hook 54, the release lever 40 is held against the biasing force of the torsion coil spring 52. The arm 44 maintains the engagement state with the force receiving piece 50.

The hook 54 is pivotally supported near its center by a pin 58 protruding outward from the leg 20, and the end opposite to the claw 56 has a spring bearing part 60 bent into a substantially U-shape. .

The hook 54 has an intermediate portion wrapped around a pin 58, one end inserted into a circular hole 62 provided in the leg portion 20, and the opposite side a spring receiving projection 6 provided at the intermediate portion of the hook 54.
A torsion coil spring 66 is provided which is engaged with the arm 4 of the release lever 40, and the biasing force causes the claw 56 to engage the arm 4 of the release lever 40.
6, that is, counterclockwise in the drawing.

Here, the claw 56 has a triangular shape, and when the release lever 40 is rotated in the direction in which the arm 44 engages with the force-receiving piece 50, the arm 46 comes into contact with the slope of the claw 56 and hooks. 54 was temporarily rotated clockwise against the biasing force of the torsion coil spring 66, the arm 44 engaged with the force receiving piece 50, and the tip 32 of the pawl 30 was reliably separated from the ratchet wheel 28. In this case, the arm 46 moves closer to the pin 58 than the pawl 56, so the pawl 56 engages with the arm 46 by the biasing force of the torsion coil spring 66, and the hook 54 is securely moved to the release lever as shown in FIG. 1.2. -40 is held.

One end of the torsion coil spring 66 provided on the hook 54 is extended further than the cut-and-raised protrusion 64, and the spring receiver is formed in the part 60.
It penetrates inside.

Furthermore, its end 66A faces a second ratchet wheel 68 which is secured to the winding shaft 22 on the outside of the leg 20.

This second ratchet wheel 68 has opposite teeth to the ratchet wheel 28.

Here, the second ratchet wheel 68 is connected to the torsion coil spring 6.
6 constitutes a holding release mechanism for the hook 54, and the end 66A of the torsion coil spring 66 is separated from the second ratchet foil 68 when the hook 54 is not engaged with the arm 46 as shown in FIG. When the hook 54 is holding the arm 46 as shown in FIGS. 1 and 2, the hook 54 is positioned within the rotational trajectory of the second ratchet wheel 68.

In this case, the rotational force of the second ratchet wheel 68 is transmitted to the hook 54 through the spring bearing part 60, and the claw 56 is moved to the arm 4 shown in FIG.
It is designed to be separated from 6.

To explain the operation of this embodiment configured as above,
The state shown in FIG. 3 is the normal running state of the vehicle, and the pawl 30 can be engaged with the ratchet wheel 28 by the operation of the acceleration detection device 34. Therefore, in the event of an emergency in the event of a vehicle collision, the pawl 30 will be engaged with the ratchet wheel 28. Therefore, the webbing unwinding rotation of the take-up shaft 22 can be reliably stopped, and the occupant can be reliably restrained.

When the occupant escapes from the vehicle after a collision, the arm 44 engages with the force-receiving piece 50 of the pole 30 by applying operating force to the knob 48 of the arm 42 and rotating it against the biasing force of the torsion coil spring 52. .

As a result, the pawl 30 is forcibly rotated and the tooth tips 32 are separated from the ratchet wheel 2B, allowing the take-up shaft 22 to unwind the webbing. It is possible to create sufficient space between the webbing and the webbing to release it.

The arm 46 of the release lever 40 rotated at the same time.
Since the pawl 56 of the hook 54 is engaged with the pawl 56, the release lever 40 is prevented from rotating as shown in FIGS. 1 and 2, and the pawl 30 is kept separated from the ratchet wheel 28.

After that, after the accident, the occupant gets back on board and webbing 1.
0 is installed, the pawl 30 is the ratchet wheel 2.
Since the winding shaft 22 remains separated from the winding shaft 8, there is a possibility that in the event of another accident, the unwinding rotation of the winding shaft 22 will become free and the occupants will be in an extremely dangerous situation.

However, in this embodiment, since a holding/release mechanism is provided, that is, when the occupant puts on the webbing 10, the second ratchet wheel 68 is moved as shown in FIG. The hook 54 is rotated against the biasing force of the torsion coil spring 66, and the pawl 56 disengages the release lever 40.

Therefore, the arm 44 of the release lever 40 is separated from the force-receiving piece 50 due to the urging force of the torsion coil spring 52, and the arm 44 is separated from the force-receiving piece 50.
0 is detected by the acceleration detection device 34 again when the ratchet wheel 2 is detected.
8, and the safety of the occupants can be guaranteed in the event of another accident.

In the above embodiment, a combination of a ratchet foil and a torsion coil spring is used to release the hook from being held when the webbing winding rotation of the take-up shaft is performed. It is clear that the holding release mechanism is not limited to this as long as it is capable of holding and releasing the holding mechanism.

As explained above, the webbing retractor according to the present invention is provided with a holding/releasing mechanism that releases the engagement of the hook with the release lever by the webbing retracting rotation of the retrieval shaft, so that the webbing retractor is forcibly rendered inoperable. This has an excellent effect in that the webbing unwinding lock mechanism can be activated immediately after the occupant re-boards the vehicle, thereby improving the safety of the occupant.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the webbing retractor according to the present invention, Fig. 2 is a side view of Fig. 1, and Figs.
FIG. 10... Webbing winding device, 22...
・Take-up shaft, 26...Webbing, 28...
... Ratchet foil, 30 ... Paul, 34
... Acceleration detection device, 40 ... Release lever 144, 46 ... Arm, 50 ...
... Force receiving piece, 54 ... Hook, 56 ...
...Claw, 66...Torsion coil spring, 68...
...Second ratchet foil.

Claims (1)

[Scope of utility model registration request] A take-up shaft for winding up occupant restraint webbing, a ratchet foil fixed to the take-up shaft, a pawl that engages with the ratchet foil in the event of a vehicle emergency to prevent the take-up shaft from unwinding the webbing, and the pole. a lever that forcibly separates the pawl from the ratchet wheel; a hook that maintains the engagement of the lever with the pawl; and a hook that is interposed between the hook and the take-up shaft and that A webbing winding device comprising: a holding release mechanism that moves the hook to release the holding by rotating the webbing winding.