JPH08132941A - Lock mechanism installing structure for vehicular seat - Google Patents

Abstract

PURPOSE: To dispense with the position adjustment of a striker to a lock plate by regulating the forward or backward rotation of a lock base by a stopper provided at the cushion frame of a seat cushion, and bringing the lock base into contact with the stopper by a spring member. CONSTITUTION: One end of a second tension spring 26b is fastened to lock mechanism 20, while the other end is fastened to a cushion frame 11a, and the lock mechanism 20 is energized backward and brought into contact with a stopper 11d provided at a bracket 11b. The stopper 11d regulates the backward rotation of the lock mechanism 20, and the disposed position of the stopper 11d is so set that the opening parts 21a, 22a of both lock bases 21, 22 of the lock mechanism 20 are opposed to a striker 15 in the maximum slippage position, predicting the maximum slippage of the striker 15 from the normal position. The striker 15 is fastened to the hook part 23a of a lock plate 23 to eliminate the generation of play.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly structure for a vehicle seat lock mechanism.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Publication No. 6-9888 as a type of vehicle seat locking mechanism, a pair of lock bases are attached to the rear end of a seat cushion and face each other. A lock plate rotatably supported between the lock bases, a pole rotatably supported between the lock bases and engaged with and disengaged from the lock plate, and the pole and the lock plate. A spring member for biasing and engaging each other, and an operation lever for rotating the pole against the spring member to disengage from the lock plate, and a striker provided on the vehicle body floor with the lock plate. There is a lock mechanism that releasably locks by a cooperative action with a pole to fix the rear end portion of the seat cushion to the vehicle body floor.

The lock mechanism is assembled to the rear end of a seat cushion whose front end is supported on the vehicle floor so as to be vertically rotatable. The lower end of the seat cushion is rotated forward and backward. This is adopted as a locking mechanism for a folding seat, which allows the seat back, which is movably supported, to lie down on the seat surface of the seat cushion and to be erected integrally with both of them to fold forward. Therefore, in the folding seat, the rear end portion of the seat cushion is normally fixed to the vehicle body floor by the action of the lock mechanism, and the seat cushion is laid down by releasing the lock of the seat cushion from the vehicle body floor. The seat back and the seat back can be pivoted forward to be folded.

[0004]

By the way, in the vehicle seat, the gap between the lock plate of the lock mechanism and the striker in the hooked state causes backlash in the lock mechanism, and abnormal noise caused by backlash occurs. Because of this, this gap must be kept within a predetermined range. However, such a gap is a positional relationship such as a supporting position of the front end portion of the seat cushion with respect to the vehicle body floor, a mounting position of the lock mechanism to the rear end portion of the seat cushion, a fixed position of the striker with respect to the vehicle body floor, an assembling relationship, and the like. It is difficult to keep the value within the predetermined range due to variations in the manufacturing dimensions of each member. For this reason, the lock mechanism is attached to the rear end of the seat cushion, the front end of the seat cushion is rotatably supported on the vehicle floor, and then the striker is placed at a position on the vehicle body floor corresponding to the position where the lock mechanism is attached. Means are provided. However, such adjusting means cannot be performed in a state where the striker is hooked on the lock plate of the lock mechanism, and is actually performed in a state where the seat track is erected forward, so it is very difficult to finely adjust the position of the striker. It is work.

Therefore, an object of the present invention is to provide a position adjusting function to a lock mechanism, thereby enabling position adjustment of a lock plate with respect to a striker, and eliminating difficult adjustment work of position adjustment of a striker with respect to a lock plate. is there.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an assembly structure for a vehicle seat lock mechanism, which is assembled to a rear end of a seat cushion whose front end is rotatably supported in a vertical direction on a vehicle floor. A pair of lock bases attached to each other, a lock plate rotatably supported between the lock bases, and a lock plate rotatably supported between the lock bases and engaged with the lock plate A detachable pawl, a spring member for biasing and engaging the pawl and the lock plate with each other, and an operation lever for pivotally operating the pawl against the spring member to separate the pawl from the lock plate, The striker provided on the vehicle body floor is releasably locked by the cooperation of the lock plate and the pole to fix the rear end portion of the seat cushion to the vehicle body floor. In the vehicle seat locking mechanism, the both lock bases are attached to the cushion frame of the seat cushion so as to be rotatable in the front-rear direction, and the lock bases can be rotated in either of the front-rear direction in the cushion. A stopper for restricting movement is provided, and a spring member is provided between the cushion frame and the lock base so as to urge the lock base toward the stopper so as to abut against the stopper. is there.

[0007]

In the structure for assembling the lock mechanism having such a structure, in the supporting position of the front end portion of the seat cushion with respect to the vehicle body floor, the mounting position of the lock mechanism at the rear end portion of the seat cushion, and the striker with respect to the vehicle body floor. The rotation restricting position of the lock base is set in advance in consideration of the positional relationship such as the fixing position of the lock and assembly, the assembly relationship, and the variation in the manufacturing dimensions of each of these members. It is preliminarily positioned at a position corresponding to.

In the lock mechanism, the lock plate is engaged with the striker arranged on the vehicle body floor to fix the rear end portion of the seat cushion to the vehicle body floor. If the striker is slightly misaligned, the striker pushes against the front or rear inclined surface of the downward opening of the lock base and tries to enter, so the lock base rotates against the spring member and the striker moves. The striker is locked on the lock plate. The spring member then returns elastically by a predetermined amount. Therefore, the striker is locked in a normal state by the rotation of the lock base and the lock plate integrated with the lock base, and the clearance between the lock plate and the striker stops within the set predetermined range. It is possible to prevent backlash and abnormal noise due to backlash.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a vehicle seat equipped with a lock mechanism assembled by adopting the assembly structure according to the present invention.
The seat is provided with a seat cushion 11, and a seat back 12 having a lower end portion attached to a rear end portion thereof so as to be rotatable in the front-rear direction via a reclining mechanism (not shown).
In the seat, the front end portion of the seat cushion 11 is attached to the seat leg 13 provided on the vehicle body floor by the support pin 14
It is supported rotatably in the vertical direction via. Also,
A lock mechanism 20, which will be described later, is attached to the rear end portion of the seat cushion 11, and is fixed to the vehicle body floor in a releasable manner by the lock mechanism 20. Therefore, when the locking operation of the locking mechanism 20 releases the fixation of the rear end portion of the seat cushion 11 to the vehicle body floor, the seat cushion 11 rotates the seat back 12 forward and lays down on the seat surface. As shown by the chain double-dashed line, it can be turned forward to be folded in an upright state.

As shown in FIGS. 2 to 4, the lock mechanism 20 includes a pair of lock bases 21, 22 facing each other, a lock plate 23, a pole 24, an operating lever 25, and first and second tension springs 26a, 26b. Is equipped with. The lock mechanism 20 includes lock bases 21 and 22,
The lock plate 23, the pawl 24, the operating lever 25, and the first tension spring 26a are provided in the same structure as the conventionally known lock mechanism, but they are attached to the cushion frame 11a forming the seat cushion 11. The structure is different from the conventional one.

In the lock mechanism 20, lock bases 21 and 22 are fixed so as to face each other, and a lock plate 23 and a pole 24 are rotated between the lock bases 21 and 22 via support pins 27a and 27b. It is movably supported. Also, the operating lever 25 is the pole 2
4 and the support pin 2 is integrally formed with the pole 24.
It is rotatably supported via 7a. A first tension spring 26a is hooked on the lock plate 23 and the operating lever 25, the lock plate 23 and the pole 24 are engaged with each other by the urging force of the first tension spring 26a, and the hook portion of the lock plate 23 is engaged. The striker 15 is hooked at 23a. The striker 15 is projectingly provided on the vehicle body floor on the lower surface of the rear end portion of the seat cushion 11, and penetrates through the openings 21a and 22a that expand below the lock bases 21 and 22 to hook the lock plate 23. 23a.

Therefore, as shown in FIGS. 3 and 4, the lock mechanism 20 is a bracket in which bolts 27d which are inserted through the bushes 27c into the mounting holes of the lock bases 21 and 22 are fixed to the cushion frame 11a. The weld nut 11c of 11b is screwed onto the weld nut 11c so as to be rotatable in the front-rear direction. Lock mechanism 2 in this state
At 0, one end of the second tension spring 26b is hooked, and the other end of the second tension spring 26b is hooked on the cushion frame 11a. As a result, the second tension spring 26b causes the lock mechanism 20 to
Is urged rearward to abut against a stopper 11d provided on the bracket 11b. The stopper 11d regulates the rearward rotation of the lock mechanism 20.
The seating position is estimated by predicting the maximum amount of deviation of the striker 15 from the normal position in consideration of variations in attachment of the seat cushion 11 and the striker 15 to the vehicle body floor, manufacturing errors of the lock mechanism 20, assembly errors, and the like. , Locking mechanism 20
The openings 21a and 22a of both lock bases 21 and 22 are set so as to face the striker 15 at the maximum displacement position.

In the seat provided with the lock mechanism 20 assembled as described above, in the seatable state shown in FIG. 1, the lock mechanism 20 is provided with the striker 15 on the hook portion 23a of the lock plate 23 as shown in FIG. Is locked, and in this state, the lock plate 23 is engaged with the pole 24 and its rotation is restricted. As a result, the lock mechanism 20 fixes the rear end portion of the seat cushion 11 to the vehicle body floor.

In the seat in this state, when the reclining mechanism (not shown) is unlocked and the seat back 12 is rotated forward, the operation wire 25a is extended in association with the rotational movement of the seat back 12. The pawl 24 rotates against the first tension spring 26a to release the engagement with the lock plate 23. As a result, the lock plate 23 moves the first tension spring 2
By the action of 6a, it rotates in the counterclockwise direction in the drawing and engages with the pole 24 again, while the striker 15 moves the lock plate
The lock bases 21 and 2 are detached from the hook portion 23a of
The second openings 21a and 22a are ready to exit. Therefore, if the seat cushion 11 is rotated forward while the seat back 12 is rotated forward and laid down, as shown in FIG.
Can be folded into the standing state shown by the two-dot chain line.

As described above, in the lock mechanism 20,
The lock plate 23 engages with the striker 15 arranged on the vehicle body floor to fix the rear end portion of the seat cushion 11 to the vehicle body floor, but when the striker 15 is slightly displaced forward from the normal position, , The striker 15 presses the front slopes of the openings 21a and 22a of the lock bases 21 and 22 to try to enter the lock bases 21 and 22a.
As shown by the chain double-dashed line in FIG. 4, the reference numerals 1 and 22 rotate against the second tension spring 26a to allow the striker 15 to enter the openings 21a and 22a, and then the striker 15 locks the lock plate. It is hooked on the hook portion 23a of 23. Therefore, even when the position where the striker 15 is disposed is deviated from the normal position, the lock base 2
1, 22 and the lock plate 23 integrated with the lock plate 23 are locked in a normal state, and the clearance between the hook portion 23a of the lock plate 23 and the striker 15 is within the set predetermined range. Settles, lock mechanism 2
It is possible to prevent the occurrence of backlash at 0 and the generation of abnormal noise due to backlash. Therefore, if the assembly structure of the lock mechanism 20 is adopted, it is not necessary to adjust the disposition position of the striker 15 in advance, and it is possible to eliminate troublesome and inaccurate striker position adjustment.

In this embodiment, the lock mechanism 2
Although 0 has been shown as an example in which the rearward rotation is restricted and the spring is biased rearward, in the present invention, the lock mechanism 20 of the present embodiment is restricted from rotating forward and
It can be modified to spring-bias forward.

[Brief description of drawings]

FIG. 1 is a schematic side view of a vehicle seat equipped with a lock mechanism that adopts an assembly structure according to the present invention.

FIG. 2 is a front view of the lock mechanism with one lock base removed.

FIG. 3 is a perspective view of the lock mechanism before being assembled to a cushion frame.

FIG. 4 is a front view of the lock mechanism assembled to the cushion frame side.

[Explanation of symbols]

11 ... Seat cushion, 11b ... Bracket, 11d
... stopper, 12 ... seat back, 15 ... striker,
20 ... Lock mechanism 21,22 ... Lock base, 21
a, 22a ... Opening part, 23 ... Lock plate, 23a ...
Hook part, 24 ... Pole, 25 ... Operating lever, 26a,
26b ... Tension spring.

Claims (1)

[Claims] 1. A pair of lock bases, which are assembled to a rear end of a seat cushion whose front end is rotatably supported in a vertical direction on a vehicle body floor and are opposed to each other, and are pivoted between the lock bases. Lock plate supported as much as possible,
A pole that is rotatably supported between the two lock bases and that engages with and disengages from the lock plate, a spring member that urges the pole and the lock plate to engage each other, and the pole is the spring member. Equipped with an operation lever that is rotated against the lock plate to be disengaged from the lock plate,
A vehicle seat lock mechanism for releasably locking a striker provided on the vehicle body floor by a cooperative action of the lock plate and a pole to fix a rear end portion of the seat cushion to the vehicle body floor. The lock base is attached to the cushion frame of the seat cushion so as to be rotatable in the front-back direction, and the cushion frame is provided with a stopper for restricting the rotation of the lock base in either the front-back direction. Further, a spring member for urging the lock base between the cushion frame and the lock base to bring the lock base into contact with the stopper is provided. .