JPS61160338A - Seat belt device - Google Patents

Abstract

PURPOSE:To prevent a belt from being wound up tightly and fastened by configurating a device in such a way that a belt wind-up shaft is locked by an emergency lock device at a time of a vehicle collision restraining simultane ously the belt from being pulled out by a wind-up tighten prevention device. CONSTITUTION:When a body is subjected to an excessive deceleration beyond the stated one as in the case of collision, a pendulum 18 is allowed to swing forward allowing a contact point 19b of a lock plate 19 to be pushed up by the head 18a of the pendulum. This allows the projection 19c to move to an engagement point of No.2 ratchet 16. Under this condition, if a belt take-up shaft 14 is allowed to rotate by a tension force of a seat belt S, No.2 ratchet 16 is rotated permitting it to be engaged with the projection 19c. This causes the lock plate 19 to be pushed further upward permitting a rotation block plate 27 to rotate by way of a projection 27b. Accordingly, a support arm 23 is disengaged. Then, the support arm 23 is sung by a tension force of the seat belt S allowing the seat belt S to be held between rollers 24 and 25. This restrains the belt from being pulled out.

Description

[Detailed Description of the Invention] This invention includes an emergency locking device that locks the rotation of the belt winding shaft by detecting vehicle deceleration and belt pull-out acceleration that occur during a vehicle collision. The present invention relates to a seat belt device that has a retractor that has been tightened and is further provided with a tightening prevention device that prevents the occurrence of so-called "winding tightening".

As a conventional seat belt device of this type, for example, the fifth
6 and 6 have been proposed (see Japanese Utility Model Application Publication No. 51-76319). Reference numeral 1 in FIG. It is wound around the shaft 2a. This retractor 2 is fixed to the vehicle body 4 via a shear bin 3 inserted through a long hole (not shown), and detects the deceleration of the vehicle and the acceleration of belt retraction that occur in the event of a vehicle collision, etc. An emergency locking device is provided to lock the rotation of 2a. In the event of an inter-vehicle collision, the rotation of the belt winding shaft 2a is locked by this emergency locking device, but since the seat belt 1 is not wound around the belt winding shaft 2a very tightly, the seat belt l is pulled with a strong force. If the retractor 2
The seat belt 1 may be pulled out from inside.

Therefore, near the upper side of the retractor 2, a bag [5] for preventing the winding from tightening is disposed to prevent the winding from tightening. When the belt winding shaft 2a is locked by the emergency locking device at the time of a vehicle collision, belt tensile force acts on the entire retractor 2. Due to this force, the shear bin 3 is sheared and the retractor 2 is moved upward as shown in FIG. Then, the brake arm 6 rotates around the shaft 6b due to the biasing force of the spring 7, and the seat belt 1 is held between the contact portion 6C of the brake arm 6 and the brake roller 8, thereby preventing so-called tightening. It will be done.

However, in this conventional seat belt device, the belt winding shaft 2a is locked by the emergency locking device,
After that, the shear bin 3 is sheared by the belt tensile force and the retractor 2 is moved, and the winding is prevented from tightening.As a result, the belt tensile force causes the winding to tighten until the shear bin 3 is sheared. In addition, the seatbelt 1 may be
This is a good result as it pulls out the winding tightness prevention device! ! 5 involves shearing of the shear bin 3, which poses a problem in that it cannot be reused and it takes time and effort to replace one part.

In order to solve this problem, the present invention provides an emergency locking device that locks the rotation of the belt winding shaft by detecting the deceleration of the vehicle or the acceleration of pulling out the belt that occurs during a vehicle collision. A seatbelt device comprising: a retractor equipped with a retractor; and a seatbelt device that clamps the seatbelt substantially simultaneously with the locking to prevent the seatbelt from tightening, the seatbelt device having a proximal end portion a support arm that is rotatably attached to the retractor and has a movable sliding member at its tip that slides in sliding contact with one surface of the seat belt; and a support arm that is fixed to the retractor and contacts the other surface of the seat belt. a fixed side sliding contact member that makes sliding contact and holds the seat belt between the movable side sliding contact member and the movable side sliding contact member when the support arm rotates; The seat belt device has a support mechanism that supports the support arm at a rotational position that separates the movable side sliding contact member and releases the support in conjunction with the emergency lock device in the event of a vehicle collision or the like. It is a feature.

According to this method, in the event of a vehicle collision or the like, the emergency locking device provided in the retractor detects the deceleration of the vehicle and the acceleration of the belt being pulled out, and locks the belt winding shaft.

At the same time, the support of the support arm by the support mechanism is released in conjunction with this emergency locking device, so that this arm rotates and the movable side sliding contact member provided at the tip of this arm moves to the fixed side. As the seat belt approaches the sliding contact member, the seat belt is held between the two layer contact members and is prevented from being pulled out. In this way, since the seat belt is clamped at approximately the same time as the belt winding shaft is locked, tightening of the seat belt is prevented. Of course, when there is no vehicle collision.

Since the support arm is supported by the support mechanism at a rotational position that separates the two sliding members, the seat belt can be freely pulled out.

“Lost” L-rin Hereinafter, this invention will be explained based on examples.

1 to 3 are diagrams showing a first embodiment of the present invention. 6 First, the configuration will be explained. The seatbelt device of this embodiment is an emergency locking device! ! A trough 11 comprising 10
A winding tightening prevention device 112 is provided at the winding tightening prevention device 112.

The retractor 11 includes the emergency locking device 10.

First, a belt winding shaft 14 for winding the seat belt S is rotatably attached between both side walls 13a of the retractor main body 13, and this belt winding shaft 14 is rotated in the belt winding direction (clockwise in the diagram) by a return spring (not shown). (rotational direction). This winding force is the seatbelt I-S of the passenger.
It is set so as not to tighten the occupant too strongly when it is installed. A first latch plate 15 is fixed to the belt winding shaft 14 inside the retractor body 13, and a second latch plate 16 is fixed to the outside of the retractor body 13. Further, a support bracket 17 is fixed to the side wall 13a of the retractor main body 13 below the second ratchet 16.
A pendulum 18 is swingably disposed on this support bracket 17.

During rocking, the head 18a of the pendulum 18 is vertically displaced relative to the bracket 1-17, as shown in FIG. A lock plate 19 is provided which is pushed upward by the swinging of the pendulum 18. In this lock plate 19, support bins 20 and 21 protruding from the retractor main body side wall 13a are elongated holes 19a.

1! A contact portion 19b that is inserted into and supported by the pendulum 18 and abuts on the head portion 18a of the pendulum 18, and the second
A protrusion 19e that engages with the ratchet 16 is formed, and an opening 10d is formed in the lower part.7 This opening 19d has a first
One end 22 of the pawl 22 that engages the latch plate 15
a has been inserted.

On the other hand, 1 roll tightening prevention bag &! 12, first, the base ends of a pair of support arms 23 are rotatably attached to both ends of the belt winding shaft 14 and arranged on the outside of both side walls 13a of the retractor main body, and the distal ends of both arms 23 are movable. The movable roller 24, which is a movable side roller 24 serving as a side sliding contact member, is in sliding contact with one surface of the seat belt S. Further, a fixed side sliding member, here a fixed side roller 25, which comes into contact with the other surface of the seat belt S is attached to the I-actor main body 13. This fixed side roller 25 is.

When the arm 23 rotates, the third movable roller 24
As shown in the figure, it is set at a position where the seat belt 10 is clamped. Furthermore, this bag prevents tightening! 12 supports the support arm 23 at a rotating position that separates the retractable roller 24 from the fixed roller 25 when the vehicle does not collide, and also supports the support arm 23 in conjunction with the emergency locking device i10 when the vehicle collides.
A support mechanism 26 is provided to release the support of the 3.

Specifically, first, a locking notch 23a is formed at a predetermined position of the support arm 23, and a rotation prevention plate 27 that is locked in the notch 23a is rotatable on a shaft 2B protruding from the retractor main body side wall 13a. is attached to. The rotation prevention plate 27 is movable by preventing clockwise rotation of the support arm 23 when the locking corner portion 27a is locked in the locking notch 23a of the support arm 23 as shown in FIG. Side roller 24
A spaced state between the roller 25 and the fixed roller 25 is maintained. Further, this rotation prevention plate 27 is provided with a protruding lock release protrusion 27b that is pushed up by the upper edge 19e when the lock plate 19 is raised. The lock is set to be released. Further, a spring 29 is disposed between the support arm 23 and the retractor main body side wall 13a to bias the support arm 23 counterclockwise.

Next, the operation of the seat belt device having such a configuration will be explained.

When the deceleration of the vehicle body or the acceleration of the belt pull-out is less than a predetermined value, such as in the event of a non-collision, the support mechanism #! The rotation of the support arm 23 is prevented by the rotation prevention plate 27 of 26, and the two rollers 24 and 25 are separated, so that the seat belt S is not held between the movable roller 24 and the fixed roller 25. Withdrawals are free. Therefore, when the belt is being pulled out, both rollers 24 and 25 are rolled, and the seat belt can be freely pulled out like a conventional seat belt.

On the other hand, when the vehicle body is decelerated more than a predetermined value or the belt pull-out acceleration exceeds a predetermined value, such as during a vehicle collision, the following occurs.

That is, due to the deceleration at the time of a vehicle collision, the pendulum 18 moves to the third position.
The head 18a of the pendulum 18 pushes up the abutting portion 19b of the lock plate 19, and the lock plate 19 is first raised to the position shown by the two-dot chain line in FIG. The protrusion 19c of the plate 19 reaches a position where it engages with the second ratchet 16. In this state, when the belt winding shaft 14 is rotated by the tensile force of the seat belt S, the second ratchet 16 also rotates and engages with the lock plate protrusion 19c, and the lock plate 19 is further pushed upward. As the lock plate 19 rises, the pawl 22 is raised and engages with the first latch plate I5. Even in this meshed state, the belt winding shaft 14
The pawl 22 is not yet locked, and is locked by this pawl 22 after being rotated slightly by the tension of the belt. At this time, the pawl 22 is also pulled upward, so the lock plate 1
9 is also pushed upward strongly as shown by the solid line in FIG. At this time, the locking release protrusion 2 of the rotation prevention plate 27 of the support mechanism 26 is held by the upper edge 19e of the lock plate 19.
7b is pushed up, this rotation prevention plate 27 is rotated, and the locking corner 27a and the locking notch 23a of the support arm 23
The lock is released.

Then, since the seat belt S is being pulled with a stronger force than usual, the support arm 23 is rotated clockwise against the biasing force of the spring 29, and the movable roller 24 is moved toward the fixed roller 25. Both lever rollers 24.25
7. In this case, the seat belt S is pinched and the seat belt S is prevented from being pulled out.

The greater the tensile force applied to the seat belt S, the more
The clamping force by both rollers 24 and 25 increases.

In this manner, in the event of a vehicle collision, after the belt winding shaft 14 is locked in the emergency lock group [110], the winding is performed in conjunction with the emergency lock group [10] before the belt tension force causes the winding to tighten. Both rollers 24 of anti-locking device 12.
At 25, the seat belt S is caught and the withdrawal is prevented. Of course, the retractor 11 is different from the conventional one.
Since the seat belt S is not configured to move, the seat belt S is not pulled out accordingly.

Also, once the collision ends, the belt tension weakens, so
The support arm 23 is rotated counterclockwise by the spring 29 of the support device $26, and the movable roller 24 is separated from the fixed roller 25. Since the belt winding shaft 14 is rotated clockwise, which is the belt winding direction, by a return spring (not shown), the first latch plate 15
The second ratchet 16 is also rotated and unlocked from the pawl 22.

The pawl 22 and lock plate 19 are lowered to the position shown in FIG. Then, the nine rotation blocking plate 27 rotates around the shaft 28, and the locking corner 27a of the one rotation blocking plate 27 falls into and is locked in the locking notch 23a of the support arm 23. The seat belt device can now be used as before.

As a result, the trouble of replacing the sheared shear bin 3 as in the conventional case can be saved.

Further, FIG. 4 shows a second embodiment of the present invention.

In the above embodiment, the fixed side sliding contact member of the winding tightening prevention device 1112 was the fixed side roller 25, whereas the fixed side sliding contact member of the winding tightening prevention device 32 of this embodiment was the guide FL33.
It is composed of This guide plate 33 is formed to have a relatively large area and is set to be inclined with respect to the moving direction of the movable roller 24.

At the time of a vehicle collision, the support arm 23 rotates clockwise and the seat belt S is held between the movable side a-ra 24 and the guide plate 33. The clamping force in this case becomes even stronger due to the wedge effect since the guide plate 33 is inclined.

In addition, since the guide plate 33 is formed to have a wide area, the movable roller 2 that sandwiches the seat belt S with this plate 33
As a result, the degree of freedom in designing the support arm 23 increases, and it can be made shorter.

Incidentally, the fixed roller 25 in the above embodiment plays the role of sandwiching the seat belt S with the movable roller 24, but the fixed roller 25 in this embodiment is simply disposed to change the direction of the belt tension force. has been done.

Incidentally, the emergency lock group mio, which is a component of this invention,
The method is not limited to the device of the above embodiment, but if the belt winding shaft 14 is to be locked in the event of a vehicle collision, for example, a system that locks the belt winding shaft 14 by detecting belt pull-out acceleration may be used. Of course, anything is fine. In addition, support IflfI! of the above embodiment! J26 is constituted by a spring 29, a rotation prevention plate 27, etc., but is not limited to this, and may be implemented by only the spring 29. Furthermore, although the movable side sliding contact member which is one component of the present invention is the movable side roller 24 in the above embodiment,
The material is not limited to this, and may be shaped like a plate, for example. Furthermore, although the above-mentioned embodiment has been described for the case of a vehicle collision, it goes without saying that the present embodiment can also be used during cornering.

Details of the invention As explained above, according to this invention.

In the event of a vehicle collision, when the belt winding shaft is locked by the emergency locking device, the winding prevention device prevents the belt from being pulled out at the same time, making it possible to prevent the occurrence of one winding, and to avoid the need for conventional shear pins. 3, it can be reused after a chair collision without having to replace the parts, which is a useful effect in practice.

[Brief explanation of drawings]

1 to 3 are diagrams showing a first embodiment of the seat belt device of the present invention, FIG. 1 is a partially exploded perspective view of the same device, and FIGS. 2 and 3 are respectively the same device. FIG. 4 is a schematic diagram showing a second embodiment of the present invention, and FIGS. 5 and 6 are diagrams showing a conventional seat belt device. The figure is a side view showing the vehicle in a non-collision state, and FIG. 6 is a side view showing the vehicle in a collision state. 10...Emergency locking device, 11...Retractor. 12.32... Winding tightening prevention device, 14... Belt winding shaft, 23... Support arm. 24...Movable side roller (movable side sliding contact member), 25...
- Fixed side roller (sliding contact member on the same room side). 26...Support mechanism, :'S...Seat belt. Figure 1 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A retractor equipped with an emergency locking device that locks the rotation of the belt winding shaft by detecting vehicle deceleration or belt pull-out acceleration that exceeds a predetermined value is provided with a retractor that locks the seatbelt at approximately the same time as the locking. A seatbelt device equipped with a tightening prevention device that prevents tightening by pinching, the tightening prevention device having a base end rotatably attached to the retractor, and a distal end portion of the seatbelt tightening prevention device. a support arm provided with a movable side sliding contact member that is fixed to the retractor and slides on the other side of the seat belt, and that is fixed to the retractor and is provided with a movable side sliding contact member that slides on one surface of the seat belt, and when the support arm rotates, the movable side sliding contact member a fixed-side sliding contact member that clamps the seat belt; and a support arm at a rotating position that separates the movable-side sliding contact member from the fixed-side sliding contact member when vehicle deceleration or belt pull-out acceleration is below a predetermined value. 1. A seatbelt device comprising: a support mechanism that releases the support of the arm in conjunction with the emergency locking device when a predetermined amount of force is exceeded.