JPS594673Y2 - webbing lock device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a webbing lock device for a seat belt device that protects an occupant in a vehicle emergency, and more particularly to a webbing lock device that can directly lock the intermediate portion of the webbing for restraining an occupant.

Generally, seat belt devices wind the end of the webbing for restraining an occupant onto a take-up device attached to the vehicle with a predetermined biasing force to apply tension to the middle part of the webbing, and this tension allows the webbing to be properly attached to the occupant. When the occupant is brought into close contact with the webbing and the occupant releases the webbing, the webbing is automatically wound up and stored by this biasing force.

Further, this winding device is provided with an inertia lock mechanism to abruptly stop unwinding of the webbing in the event of a vehicle emergency and to securely restrain the occupant.

In this inertia lock mechanism, a pawl operated by an acceleration sensor engages with a ratchet wheel fixed to a webbing take-up shaft to stop the unwinding rotation of the webbing shaft.

However, with this inertia lock mechanism, even though the unwinding rotation of the winding shaft is stopped in the event of a vehicle emergency, the webbing that has already been wound around the winding shaft is tightly wound.
It has been pointed out that there is a problem in which the webbing is stretched out, that is, a state of tightening occurs, and the occupant is not fully restrained by the amount of tightening.

This stretching phenomenon due to tightening is particularly noticeable when the seat belt device is a so-called automatic attachment type seat belt device that automatically attaches the webbing to the occupant after the occupant is seated.

This is because the winding diameter of the winding shaft increases because the middle part of the webbing is largely moved in the longitudinal direction of the vehicle when a passenger gets on or off the vehicle.

In consideration of the above-mentioned facts, the present invention aims to provide a webbing locking device that can directly lock the intermediate portion of the webbing to immediately securely restrain the occupant in the event of a vehicle emergency.

The webbing lock device according to the present invention has a first lock attached to the frame.
The middle portions of the webbing are wound in opposite directions by supporting the second rollers respectively, and the second roller is held in a release position separated from the first roller by an elastic body, so that the tension of the webbing is reduced in the event of a vehicle emergency. If the ebbing increases, the second roller is brought closer to the first roller against the biasing force of the elastic body and set to the locked position, so that the intermediate part of the ebbing between the first roller and the first roller is directly removed. It has a locking structure,
Especially when moving from the release position to the lock position, the first
The gear provided on the roller meshes with the rack and rolls, so that when the lock is locked, the second roller is reliably brought closer to the first roller and the pressing force on the first roller is increased. ing.

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

The embodiment of the present invention shown in FIG. 1 is an embodiment in which the seat belt device is an automatic seat belt device that can automatically attach the webbing 10 after the occupant is seated.

In FIG. 1, one end of the occupant restraint webbing 10 is secured to the lower part of the door 14 of the vehicle body by an anchor plate 12, and the other end is wound up by a winding device 16 similarly attached to the lower part of the door. There is.

This winding device 16 winds up the webbing 10 using a biasing force, but has a built-in inertia lock mechanism that abruptly stops unwinding the webbing 10 in case of a vehicle emergency.

The middle part of this webbing 10 is folded back at a through ring 18 provided at the top of the door 14.
A tongue plate 20 is provided between the ring 18 and the anchor plate 12 so as to be movable in the longitudinal direction of the webbing 10. 24 can be guaranteed.

As a result, the occupant 26 can wear a three-point seat belt using the webbing 10 by attaching the tongue plate 20 to the buckle device 24 after sitting on the seat 28.

In addition, in a state where the tongue plate 20 is engaged with the buckle device 24, when the door 14 is opened when an occupant gets on the vehicle, the intermediate portion of the webbing 10 moves away from the seat 26 according to the circular arc movement of the door 14, and moves toward the front of the vehicle (perpendicular to the page). 1), a space for the occupant to ride is formed between the webbing 10 and the seat 28, and when the door 14 is closed after the occupant 26 or the seat 28 is seated, the occupant 26 can move as shown in FIG. It is possible to automatically enter the device state by the webbing 10.

The webbing 10 between the through ring 18 and the winding device 16 is passed through a webbing lock device 30 provided above the door 14 and below the through ring 18.

As shown in FIG. 2.3, this webbing locking device 30 has a plate-like frame 32 attached to the door 1 by means of mounting bolts 33.
It is designed to be attached to 4.

A pair of parallel legs 34 extend from both sides of the frame 32.
35 is erected, and this parallel leg portion 34.35 has a long hole 4 for accommodating a first roller 36 and a second roller 38.
0 is provided.

Also, side plates 44.46 are fixed from the outside of the parallel legs 34° 35 with a plurality of mounting screws 42, and a portion of these side plates 44.46 abuts one end of the elongated hole 40. At the same time, a shaft hole 48 is formed so as to pivotally support the first roller 36.

On the other hand, the second roller 38 is knurled on its outer periphery to increase the frictional resistance with the webbing 10, and a rectangular protrusion 50 is formed near the axial end of the second roller 38. A gear 52 is fitted onto this rectangular protrusion 50 to rotate together with the roller 38.

Here, the axial length of the cylindrical portion of the second roller 38 is such that its axial end is supported by the elongated hole 40.

In the state shown in FIG. 2 in which the second roller 38 is disposed at one end of the elongated hole 40, it is separated from the first roller 36, and this state is the release position.
The locked position is when the roller approaches the first roller 36 along the elongated hole 40.

Further, the webbing 10 unwound from the winding device 16 passes near the second roller 38, is wound around the first roller 36 for about half a circumference, and is then folded back and passed around the second roller 38.
The second roller 38 wraps it around half its circumference again and turns it back, and the second roller 38 wraps it in the opposite direction to the first roller 36. ing.

Furthermore, the webbing 1 wound around this second roller 38
0 passes near the first roller 36 and passes through the through ring 18
It is designed to lead to.

Therefore, the webbing 10 wound around the webbing lock device 30 has a substantially S-shape as shown in FIG. 2.

A spring hooking recess 54 is formed in a portion of the parallel legs 34, 35, into which an intermediate portion of a wire spring 56 is inserted.

Both ends of the wire spring 56 are bent in a direction perpendicular to the middle part, forming a spiral along the outer peripheral surface of the side plate 44, 46, and the end 58 of the wire spring 56 extends from the second roller 3 protruding from the elongated hole 40.
The thin shaft portion 60 of No. 8 is pivotally supported.

The biasing force of the wire spring 56 is designed to bias the second roller 38 away from the lock position and toward the release position (rightward in FIG. 2).

Therefore, when the tension of the webbing 10 increases, the second roller 38 can move toward the lock position against the biasing force of the wire spring 56.

Also, when the second roller 38 moves toward the lock position, the gear 52 is moved to the rack 62 formed on the side plates 44 and 46.
In other words, the gear 52 and the second roller 38 move to the lock position while rolling, and this transfer direction is the first, second, and third rollers.
The direction is such that the tension of the webbing 10 between the second rollers 36 and 38 increases.

To explain the operation of this embodiment configured in this way, FIG. 1 shows a state in which the occupant has already attached the webbing 10, and inside the webbing lock device 30, as shown in FIG. Since the roller 38 is in the release position separated from the first roller 36, the webbing 10 can be moved while rotating the first and second rollers 36, 38, and the take-up device 16 also moves the webbing 10. Since the winder can be unwound, the occupant can freely change the driving position against the winding force of the winding device 16 during normal vehicle running conditions.

Next, when the vehicle is in an emergency situation such as a collision, the inertia lock device in the winding device 16 suddenly locks the webbing 10.
Stop unwinding.

At the same time, the occupant 26 is thrown forward of the vehicle due to the inertia force of the collision, so the tension in the webbing 10 increases.

This tension acts in the direction of bringing the rollers 36 and 38 closer together as shown by arrows A and B in FIG.
As shown by the two-dot chain line in the figure, the lock position is close to the first roller 36.

The second roller 38 moving to this locked position is moved by the gear 52.
moves while meshing with the rack 62, so it rolls and the first
The intermediate portion of the webbing 10 is firmly locked between the rollers 36 and 38.

This locked state continues as long as tension continues to act on the webbing 10, and as a result, tension due to the collision inertia of the occupant acts on the webbing between the webbing lock device 30 and the take-up device 16 shown in FIG. Therefore, the occupant is restrained by the webbing 10 whose both ends are secured to the vehicle body by the webbing lock device 30 and the anchor plate 12, providing a tight restraint condition similar to that of a seat belt device. I can do it.

That is, no large tension is applied to the webbing between the webbing lock device 30 and the take-up device 16 and the webbing taken up by the take-up device 16, and
No matter how large the webbing winding amount of No. 6 is, it is possible to reliably secure the restraint state of the occupant.

Furthermore, when the occupant opens the door 14 after the normal driving condition ends, the webbing 10 separates from the seat 28 in accordance with the arc movement of the door 14, so that the webbing attachment condition is released and the occupant can easily get off the vehicle. .

Further, after getting out of the vehicle and sitting down again, the webbing 10 can be automatically attached by simply closing the door 14.

Although the above embodiment describes an example in which the present invention is applied to a seat belt device that automatically attaches webbing to an occupant, the present invention is not limited to this and can be applied to a wide range of general seat belt devices. Needless to say.

As explained above, the webbing lock device according to the present invention is capable of moving a pair of rollers around which webbing is wound in opposite directions from a release position where the rollers are separated from each other to a locked position where the rollers are close to each other. Since the webbing is rolled, the webbing is reliably held between the pair of rollers and has an excellent effect of improving the ability to restrain the occupant.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view from the front of the vehicle showing an embodiment of the webbing lock device according to the present invention, FIG. 2 is a side view showing the first webbing lock device (the cover is omitted), and FIG.
The figure is an exploded perspective view of FIG. 2. 10...Webbing, 30...Webbing lock device, 32...Frame, 36...
...First roller, 38...Second roller, 48...Shaft hole, 52...Gear, 56
...The line is 62...Rack.

Claims (1)

[Scope of utility model registration request] a first roller that is pivotally supported on the frame and around which the occupant restraint webbing is wound and folded; a second roller that has a gear and around which the webbing is wound and folded back in a direction opposite to the winding direction; a guide groove provided on the frame to guide the second roller from a release position where it is separated from the first roller to a locking device approaching the first roller; and a guide groove provided in an intermediate portion from the release position to the lock position. A webbing lock device comprising: a rack for rolling the gear; and an elastic body for biasing the second roller toward the release position.