JP2542153Y2 - Locking device for folding belt-in seat for automobile - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a foldable belt-in seat in an automobile.

[0002]

2. Description of the Related Art A rear seat of a light van has a front end portion (a lower end portion of a front leg or a front end portion of a seat frame) rotatably mounted on a vehicle body member (floor or luggage compartment floor). A lock device is attached to the rear portion (the lower end of the rear leg or the rear portion of the seat frame). The lock device is engaged by being engaged with a striker fixed to a vehicle body member, and the backrest is tilted forward to fold the lock. By disengaging the device from the striker and rotating the folded sheet forward about the front end of the sheet, the luggage compartment can be expanded to the unused storage position. Such a foldable seat often employs a so-called belt-in seat in which a seat belt end is fixedly attached to a seat component such as a rear leg portion or a seat frame rear portion (for example, Japanese Utility Model Application Laid-Open No. 63-32043). Reference).

[0003]

SUMMARY OF THE INVENTION In the state where an occupant is seated on a foldable belt-in seat as described above and a seatbelt is worn, when a frontal collision accident occurs, engagement of the locking device with a striker. A large load is applied to the part.

That is, as shown in FIG. 3, a locking device 2 attached to the rear portion of the frame 11 of the seat 1 includes a base plate 21, a claw 22 rotatably attached to the base plate 21 by a shaft 25, and a shaft attached to the base plate 21. 26, a detent lever 23 rotatably attached by a spring 26 and a detent lever 23. The striker S fits into the engaging groove 22a of the claw 22 and the detent lever 23
Is generally configured to engage with the claw portion 22b of the claw 22 so as to be in a locked state. Therefore, a frontal collision causes the seat belt 3 to pass through the seat belt 3 as shown in FIGS. When a large forward upward load is applied to the rear of the seat frame 11, almost all of the load is applied to the claw 2.
2, there is a problem that if the load is excessive, the claw 22 may be deformed or broken and the lock may be released as shown in FIG.

An object of the present invention is to address the above-mentioned conventional problems.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a locking device for a folding type belt-in seat for an automobile as described above.
A cutout groove is formed in the base plate from the vicinity of the upper end of the striker guide groove toward the rear downward, and a cutout having a shape substantially matching the cutout groove of the base plate at the locking position of the claw is formed in the claw. A feature is that a groove is formed.

[0007] Preferably, the side member (vertical frame) of the seat frame is structured to be easily buckled by a load in the vehicle longitudinal direction.

[0008]

In the above construction, when a forward collision load acts on the rear portion of the seat via the seat belt and the side member of the seat frame slightly buckles, the striker fitted and engaged in the engagement groove of the claw is moved. Displaced relatively rearward, fits in the notch groove of the base plate and claw,
After that, the load will be supported by both the base plate and the claw, and the load on the claw itself will be halved compared to the conventional locking device, and even if the load is considerably large, the claw will deform or break. There is no possibility that the lock will be released.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a seat comprising a seat cushion 12 and a backrest 13 mounted and fixed on a seat frame 11, and the seat 1 is used as a rear seat of a van type automobile. is there. That is, the front end of the seat frame 11 is located at the luggage compartment floor 4 of the van type car.
Of the seat frame 11 is attached to the front end of the seat frame 11 so as to be rotatable. A locking device 2 is attached to both sides of the rear portion of the seat frame 11, and the locking device 2 is engaged with a striker S fixed to the luggage compartment floor 4. As a result, the seat 1 is locked in the use state, the backrest 13 is moved forward, and the seat cushion 1 is
When the lock device 2 is unlocked and rotated about 180 degrees forward about the hinge 5, the bottom of the seat frame 11 is flush with the luggage compartment floor 4 and is unused storage. In this state, the bottom surface of the seat frame 11 that is flush with the front of the luggage compartment floor 4 can also be used as a luggage loading floor. At the rear end of the seat frame 11, a seat belt anchor 31 for fixing the end of the seat belt 3 is fixed.

The lock device 2 is, as shown in FIG.
Claw 2 having engagement groove 22a for engaging striker S
2 is rotatably mounted on a base plate 21 formed of an outer plate and an inner plate by a shaft 25, and is engaged with the claw portion 22b of the claw 22 to rotate the claw 22 in the unlocking direction (counterclockwise in the figure). (Rotating direction)
The detent lever 23 is rotatably mounted on the base plate 21 by a shaft 26 so as to rotate the claw 22 in the unlocking direction and to engage the detent lever 23 with the claw portion 22b (clockwise in the figure). Direction)
2A, a spring 24 is provided to bias the detent lever 23 from the locked state shown in FIG.
Is rotated forward to release the engagement with the claw portion 22b.
The claw 22 is moved by the spring force of the spring 24 in FIG.
And the striker S
Is relatively released from the engagement groove 22a of the claw 22 to be in the unlocked state. When the rear portion of the seat 1 is lowered as shown by the arrow in the unlocked state, the striker S fits into the striker guide groove 21a of the base plate 21 and the claw 22 is inserted.
The claw 22 hits one edge of the engagement groove 22a of the
The detent lever 23 rotates around the shaft 26 and engages with the claw portion 22b to be in a locked state while being fitted into the engagement groove 22a while rotating around. It is exactly the same as the conventional one.

In the present invention, a notch groove 211 into which the striker S is fitted is formed from the vicinity of the upper end of the striker guide groove 21a of the base plate 21 toward the rear downward, and the claw 22 is locked at the locking position of the claw 22. A notch groove 221 having a shape substantially matching the notch groove 211 is formed so as to be continuous with the engaging groove 22a.

As described above, the vehicle crashes head-on while the occupant is seated on the seat 1 and the seat belt 3 is fastened.
When a load of F acts on the seat belt 3 as shown in FIG. 4A and buckling occurs on the side member of the seat frame 11 as shown in FIG. The striker S is displaced upward and forward, and the striker S is relatively notched.
11 and 221. After that, since the load is held by both the base plate 21 and the claw 22, the load applied to the claw 22 itself is reduced by half,
Even when a considerably large load is applied, the claw 22 is not deformed or broken, and the lock is not released as shown in FIG.

In the above, it is preferable that the side members (vertical frames) of the seat frame 11 be configured to buckle with a certain constant load. In this case, the side members buckle due to the initial load at the time of collision and the striker Since the S fits into the notches 211 and 221 and reliably holds the load here, the load applied to the hinge 5 and the hinge mounting surface can be reduced.

The present invention is not limited to the sheet as shown in FIG.
As disclosed in Japanese Unexamined Patent Publication, the lower leg of the front leg is pivotally mounted on the floor, and the lower leg of the rear leg is provided with a locking device for engaging a striker fixed to the floor. The present invention is also applicable to a foldable belt-in seat locking device in which a seat belt end is fixed to a rear portion of a seat frame or a lower portion of a rear leg.

[0016]

As described above, according to the present invention, it is possible to form a very simple notch groove in the base plate and the claw of the conventional locking device without adding any new parts. Accordingly, the impact load can be sufficiently held by both the base plate and the claw, and the lock can be prevented from coming off, which can bring a great effect in practical use.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.
(B) respectively shows an unlocked state.

FIG. 3 is a main part side view showing a conventional lock device.

FIG. 4 shows buckling deformation modes due to a collision load of a foldable belt-in seat equipped with a conventional locking device (A),
It is an explanatory side view shown in order of (B) and (C).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat 2 Lock device 3 Seat belt 4 Luggage compartment floor 5 Hinge 11 Seat frame 21 Base plate 21a Striker guide groove 22 Claw 22a Engagement groove 22b Claw portion 23 Detent lever 211 Notch groove 221 Notch groove S Striker

Claims (2)

(57) [Scope of request for utility model registration] 1. A foldable belt in which a front end portion is rotatably attached to a vehicle body member, and a locking device for engaging and locking a striker fixed to the vehicle body member is fixed to a rear portion, and a seat belt end is fixed to a rear portion of the seat. The seat includes a base plate having a striker guide groove, a claw rotatably mounted on the base plate, and an engagement groove into which the striker is fitted and engaged, and a claw portion of the claw rotatably mounted on the base plate. A notch groove into which the striker fits rearward and downward from near the upper end of the striker guide groove is formed in the base plate of the lock device including a detent lever that engages and restrains rotation of the claw.
A notch groove having a shape substantially matching the notch groove of the base plate is formed in the claw with the striker fitted and engaged in the engagement groove of the claw. Seat locking device. 2. The foldable belt-in-seat locking device for an automobile according to claim 1, wherein the side members of the seat frame are structured to be easily buckled by a load in the vehicle longitudinal direction. Locking device for folding belt-in seats for automobiles.