JPH0421730Y2 - - Google Patents

Description

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

[Problems to be solved by the prior art and the invention]

BACKGROUND ART Currently, a locking mechanism is installed in a retractor of a seat belt device mounted on a vehicle to prevent rotation of the webbing in the pulling direction by a sudden increase in tension of the webbing when the vehicle suddenly decelerates, thereby reliably restraining the occupant.

This is because two ratchet foils coaxially attached to the take-up shaft near both ends of the webbing widthwise are engaged by a pole, which is usually separated from the wheels, by the actuation of a deceleration sensor, and the webbing is pulled out from the take-up shaft. It is designed to prevent directional rotation.

In such a lock mechanism, when the tension of the webbing decreases, the lock is automatically released and the retractor is in the same state as before the vehicle suddenly decelerated (the ratchet wheel and pole are separated). has been done.

However, if the vehicle rolls over, the pole remains engaged with the ratchet wheel, and this 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 rotatable release lever for forcibly and manually separating the pole from the ratchet wheel.

However, since the state of engagement with the pawl changes as the release lever rotates, the force applied by the release lever to the pawl is uneven, resulting in a problem that the pawl is not smoothly released from the ratchet wheel.

The present invention takes the above-mentioned facts into account, and aims to provide a webbing lock release mechanism that can apply an even force to the pawl and smoothly release the pawl from the ratchet foil, regardless of the rotation of the release lever.

[Means and actions for solving problems]

The webbing lock release mechanism according to the present invention includes a pair of ratchet foils each fixed to both ends of a webbing take-up shaft that is stretched over a pair of parallel plates, and a pair of ratchet foils that are stretched over the pair of plates in correspondence with the ratchet foils. a pawl that engages with the pair of ratchet wheels to prevent the take-up shaft from rotating in the webbing pull-out direction when the vehicle suddenly decelerates; a release lever that is rotated when the pawl is forcibly separated from the ratchet foil; and the release lever. a release member that is rotatably supported by the release lever and is moved in parallel with the pawl in a direction that engages with the intermediate portion of the pawl in response to rotation of the release lever and disengages the pawl from the ratchet wheel; have.

According to the present invention, when the release lever is rotated, the release member rotatably supported by the release lever engages in the middle portion of the pawl, that is, between the pair of ratchet foils, and releases the pawl from the ratchet foil. moved in the direction. This movement of the release member is parallel to the pole due to relative rotation between the release lever and the release member.

Therefore, regardless of the rotation of the release lever, the state of engagement between the pawl and the release member remains constant, and the release lever can apply an average force to the pawl via the release member, so the pawl can be smoothly released from the ratchet wheel. dissociated.

[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. The retractor 12 is used for an automatic seat belt device that automatically attaches the webbing 26 to the occupant after the occupant is seated, and is installed near the center console (not shown) of the 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 intermediate portion of the winding shaft 24, and a portion of the webbing 26 is wound around the 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 secured 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.

Ratchet foils 28,
28 are fixed to each other 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.
Further, 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 (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 thereof are blade portions 36, 36 corresponding to the ratchet wheels 28, 28.

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 ratchet wheels 28, 28.

The pole 34 is usually a sensor lever (not shown)
When the vehicle suddenly decelerates, the sensor lever is tilted by an acceleration sensor (not shown), and the pole 3
4 rotates, the ratchet wheel 28,
28 to prevent rotation of the winding shaft.

In addition, a drawn concave part 38 is formed in the middle part of the wide part 34C of the pole 34 in a direction separating from the webbing 26 wound in layers, and a hook 40 serving as a dissociation member can be engaged therewith. It's becoming like that.

The hook 40 has a substantially triangular plate shape with a bent L-shape at the bottom, and the bent portion 40A is inserted into the recessed portion 38 on the winding shaft 24 side.

As shown in FIG. 2, by pulling up the hook 40 upward (in the direction of arrow A), the pawl 34 is rotated and can be forcibly separated from the ratchet wheels 28, 28.

Further, a circular hole 42 is provided near the apex of this hook 40.
The release lever 44 is pivoted by a pin 46 of the release lever 44.

The release lever 44 moves the pawl 34 to the ratchet wheels 28, 28 when the pawl 34 remains engaged with the ratchet wheels 28, 28.
It is a manual lever that applies a force for releasing the hook 40 (in the direction of the arrow A in FIG. 2) from the hook 40, and one side is pivotally supported by a bracket 45 integrally formed on the upper end surface of the leg plate 16, and the other side is supported by the handle portion 44A. It is becoming.

The middle part of the release lever 44 has the protrusion 4
6 protrudes toward the front side of the paper in the second drawing, and the hook 4
By being inserted into the circular hole 42 of 0, the hook 4
0 can be rotated around the protrusion 46.

Therefore, when the handle portion 44A of the release lever 44 is pulled up (in the direction of arrow B in FIG. 2), the shaft support of the release lever 44 to the leg plate 16 becomes a fulcrum, and the hook 40 can be pulled up in the direction of arrow A. It's summery.

In this case, both ends of the bottom of the hook 40 are connected to the pole 3.
4, and the hook 40 is rotatable around the protrusion 46, so that the hook 40 is moved parallel to the pawl 34 (in the direction of arrow A) and the pawl 34 blade part 36,3
It is now possible to apply force evenly to 6.

Further, a protrusion 48 is integrally provided near the apex of the hook 40, and a stop pin 50 for restricting movement of the protrusion 48 is provided on the release lever 44. Further, a tension coil spring 52 is attached between the hook 40 and the release lever 44, and biases the hook 40 in the clockwise direction in FIG. 2 so that the protrusion 48 and the stop pin 50 come into contact with each other.

This stop pin 50 is connected to the bent portion 4 of the hook 40.
0A is a position that does not interfere with the movement of the pole 34 when the vehicle suddenly decelerates. Also, hook 40
Since the stop pin 50 is normally in contact with the stop pin 50, vibration noise is not generated even when the vehicle body vibrates during driving.

[Effect of the embodiment]

After riding the vehicle, the occupant can automatically wear the webbing 26 by moving the webbing 26 by a drive device (not shown).

When the vehicle suddenly decelerates, the action of the acceleration sensor causes the pawl 34 to move towards the ratchet wheel 2.
8 and 28 to securely restrain the occupant.

However, if the vehicle rolls over, the pawl 34 remains engaged with the ratchet wheels 28, 28.

In this state, to release the lock, pull up the release lever 44 in the direction of arrow B in FIG. The release lever 44 rotates about the pivot of the leg plate 16, and the hook 40, which is pivoted by the protrusion 46 at the intermediate portion, is pulled up in the direction of arrow A. The bent portion 40A of the hook 40 is connected to the concave portion 38 of the pole 34.
, so pull up the pole 34 and
It can be spaced apart from the ratchet foils 28,28.

In this case, both ends of the bottom side of the hook 40 are arranged near the blades 36, 36 of the pole 34,
Since the hook 40 rotates around the pin 46, the hook 40 moves parallel to the pole 34, and the blade parts 36, 3
Force can be applied evenly to 6.

Therefore, the pole 34 can be reliably separated from the ratchet foils 28, 28.

In this embodiment, the present invention is used in an automatic seat belt device, but it may also be used in a retracting device for a normal seat belt device.

[Effect of idea]

As explained above, the webbing lock release mechanism according to the present invention, regardless of the rotation of the release lever,
It has the excellent effect of applying an even force to the pole and smoothly disengaging the pole from the ratchet foil.

[Brief explanation of the drawing]

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, and FIG. 2 is a front view of the winding device according to the present embodiment. 10...Webbing lock release mechanism, 24...
Winding shaft, 28...Ratchet foil, 34...Pole, 40...Hook, 44...Release lever.

Claims (1)

[Scope of utility model registration request] A pair of ratchet foils are respectively fixed to both ends of a webbing take-up shaft that is stretched over a pair of parallel plates; a pawl that engages with the winding shaft to prevent rotation of the webbing pull-out direction; a release lever that is rotated when the pawl is forcibly separated from the ratchet wheel;
a release member that is rotatably supported by the release lever and is moved in parallel with the pawl in a direction that engages with the intermediate portion of the pawl and separates the pawl from the ratchet foil in response to rotation of the release lever; A webbing lock release mechanism having.