JP2550404Y2 - Vehicle seat - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat provided with a reclining mechanism.

[0002]

2. Description of the Related Art As a type of a vehicle seat, a lower arm fixed to a seat cushion side is attached to a rear end of the lower arm so as to be rotatable in the front-rear direction at a lower end and fixed to a seat back side. Arranged between the upper arm
A ratchet fixed to the upper arm and rotating integrally with the upper arm; a pawl that is swingably attached to the lower arm and meshes with the ratchet and is detachable; and a rotatably assembled to the lower arm. There is a vehicle seat provided with a reclining mechanism having a release lever for releasing engagement of the pawl with the ratchet by a rotating operation.

[0003]

In the case of a two-door vehicle, when the occupant of the rear seat gets on and off the vehicle, the seat back of the front seat is tilted forward (to the front). Therefore, after the occupant of the rear seat has finished getting on and off, the occupant using the front seat must return the seatback in the forwardly moved state to the original state, but the inclination angle of the seatback is set to the optimum position each time. There is the inconvenience of having to adjust. Accordingly, an object of the present invention is to address such a problem.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a vehicle seat having a reclining mechanism of the above-mentioned type, which is rotatably mounted on both the arms and positioned coaxially with a ratchet of the reclining mechanism. A second ratchet, which is fixed to the upper arm, protrudes laterally, and has an arc-shaped long hole provided on the second ratchet centering on a rotation fulcrum of the ratchet, and a long hole of the same ratchet provided on the lower arm. A stopper pin that penetrates a long hole facing the first ratchet, an operating means for rotating the second ratchet, and a tilt angle regulating mechanism having a lock means for locking the second ratchet so that the second ratchet can be released. It is characterized by the following.

[0005]

In the vehicle seat having the above configuration, when the lock state of the second ratchet is released by operating the lock means of the inclination restricting mechanism, the ratchet becomes rotatable, and the ratchet is operated by the operation of the operation means. Can be rotated. In this state, the engagement of the pawl with the ratchet (first ratchet) is released by operating the release lever of the reclining mechanism, and the seatback is adjusted to a desired inclination angle. After the adjustment of the tilt angle is completed, the second ratchet is rotated to the maximum by operating the operating means of the tilt angle regulating mechanism, and then the ratchet is locked by operating the lock means. As a result, the rotation range of the seat back is restricted to a certain range, and when the seat back is thereafter moved forward and then returned, the seat back is acted on by the action of the stopper pin and the slot on the upper arm side, which constitute the tilt regulating mechanism. To the maximum backward regulated. This maximum inclined position corresponds to the position adjusted by the occupant in advance, and the subsequent seat
No need to adjust the backing.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle seat according to an embodiment of the present invention; FIG. It is shown. The seat is provided with a reclining mechanism 20 and an inclination regulating mechanism 30 between a lower arm 11 fixed to the seat cushion S1 and an upper arm 12 fixed to the seatback S2. It is housed in a reclining case C.

The reclining mechanism 20 is known per se, and includes a first ratchet 21, a first pawl 22, a first cam 23, a release lever 24, and a first spring 25.
It has. The first ratchet 21 is the upper arm 12
And is provided with an arcuate tooth portion 21a on the outer periphery. The arc-shaped tooth portion 21a is formed in an arc shape centered on the rotation fulcrum of the upper arm 12. The first pawl 22 includes a tooth portion 22a that meshes with and disengages from the tooth portion 21a of the first ratchet 21. The first pawl 22 is swingably mounted on the lower arm 11 side and faces the tooth portion 21a of the first ratchet 21.

The first cam 23 is fixed to a release lever 24 and is rotatably mounted together with the lever 24 on the lower arm 11 side. The first cam 23 faces the back of the first pawl 22, and engages and disengages from the back by rotation. The release lever 24 has one end formed on the operation portion 24a and a cam hole 24b formed on the other end. An engagement pin 22b provided on the tip side of the first pawl 22 is fitted into the cam hole 24b. The first spring 25 is engaged between the side plate 13 fixed to the lower arm 11 and the release lever 24, and constantly urges the release lever 24 counterclockwise in the drawing.

In the reclining mechanism 20,
When the release lever 24 is not operated, the first cam 23 presses the back of the first pawl 22, and the pawl 22 meshes with a part of the teeth 21 a of the first ratchet 21. In this state, the upper arm 12 is locked with respect to the lower arm 11, and the seatback S2 to which the upper arm 12 is fixed is held at a predetermined inclination angle.

In order to adjust the inclination angle of the seatback S2 in this state in the front-rear direction, the release lever 24 is rotated clockwise in the drawing. As a result, the cam 23 integrated with the release lever 24 rotates in the same direction and separates from the back of the first pawl 22. Therefore, the pawl 22 is detached from the first ratchet 21 by the action of the cam hole 24b of the release lever 24 and the engaging pin 22b of the pawl 22. As a result, the lock of the upper arm 12 with respect to the lower arm 11 is released, and the seatback S2 can rotate in the front-rear direction, so that the inclination angle in the front-rear direction can be adjusted.

The tilt regulating mechanism 30 has the second ratchet 31, the second pawl 32, the second cam 33, the lock lever 34, the second spring 35, and the small gear 36, the handle 37 and the stopper pin 38. It has. The second ratchet 31 is mounted coaxially with the upper arm 12 and rotatably with respect to the arms 11 and 12. The second ratchet 31 has an arc-shaped long hole 31a centered on a pivot point and an arc-shaped tooth 31b. The second pole 32 is meshed with the tooth 31b of the second ratchet 31 and is detachable from the tooth 32.
a, and is rotatably mounted on the lower arm 11 coaxially with the first pawl 22 so that the teeth 31 of the second ratchet 31 are provided.
b.

The second cam 33 is fixed to a lock lever 34 and is rotatably mounted together with the lever 34 on the lower arm 11 side. The second cam 33 is opposed to the back of the second pawl 32, and is engaged and disengaged from the back by rotation. One end side of the lock lever 34 is the operation unit 3.
4a and a cam hole 3 at the other end.
4b is formed. The second pole 3 is provided in the cam hole 34b.
The engagement pin 32b provided on the tip side of the second 2 is fitted. The second spring 35 includes the lower arm 11 and the lock lever 34.
, And constantly urges the lock lever 34 in the illustrated counterclockwise direction.

As shown in FIGS. 1 and 3, the small gear 36 is rotatably mounted on the lower arm 11 and meshes with the teeth 31b of the second ratchet 31. A handle 37 is attached to the distal end so as to be integrally rotatable. As a result, the small gear 36 is rotated by rotating the handle 37 to rotate the second ratchet 31. The stopper pin 38 is fixed to the upper arm 12 and the first ratchet 21, and passes through the arc-shaped long hole 31 a of the second ratchet 31 and the long hole 11 a provided in the lower arm 11. The arc-shaped long hole 11 a of the lower arm 11 is located to face the arc-shaped long hole 31 a of the second ratchet 31.

In the vehicle seat having such a structure, as described above, when the release lever 24 of the reclining mechanism 20 is not operated, the upper arm 12 is moved to the lower arm 11.
And the seat back S2 is held at a predetermined inclination angle. In this state, when the release lever 24 is rotated clockwise in the figure, the cam 23 integrated with the release lever 24 rotates in the same direction and separates from the back of the first pawl 22. Therefore, the pawl 22 is detached from the first ratchet 21 by the action of the cam hole 24b of the release lever 24 and the engaging pin 22b of the pawl 22. For this reason, the lower arm 11 of the upper arm 12
, The seat back S2 can be rotated in the front-rear direction, and the inclination angle in the front-rear direction can be adjusted. The adjustment range of the tilt angle is the second range of the tilt angle control mechanism 30.
This is a certain range regulated by the long hole 31 a of the ratchet 31 and the stopper pin 38. Therefore, in the sheet,
If the seatback S2 is moved backward as much as possible after the seatback S2 is moved forward, the seatback S2 returns to the original inclined position.

When the lock lever 34 of the inclination restricting mechanism 30 is rotated clockwise in the drawing, the second cam 33 integrated with the lock lever 34 is rotated in the same direction and detaches from the back of the second pawl 32. I do. For this reason, the lock lever 3
The pawl 32 is disengaged from the second ratchet 31 by the action of the fourth cam hole 34b and the engaging pin 32b of the second pawl 32. For this reason, the locked state of the second ratchet 31 is released and the second ratchet 31 can be rotated, and the ratchet 31 can be rotated by rotating the handle 37. Further, in this state, the first ratchet 2 of the first pawl 22 is operated by operating the release lever 24 of the reclining mechanism 20.
1 and the seatback S2 is adjusted to a desired inclination angle. After the adjustment of the inclination angle of the seatback S2 is completed, the handle 37 of the inclination restricting mechanism 30 is operated to rotate the second ratchet 31 to the maximum, and then the lock lever 34 is turned on.
Is operated to lock the ratchet 31. As a result, the rotation range of the seatback S2 is restricted to a certain range, and when the seatback S2 is thereafter moved forward and then returned, the seatback S2 is moved rearward as far as possible by the inclination restricting mechanism 30. Incline. This maximum inclined position corresponds to the position adjusted by the occupant in advance, and thereafter, it is not necessary to further adjust the seatback S2.

[Brief description of the drawings]

FIG. 1 is a partially omitted side view showing a main part of a vehicle seat according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of the vehicle seat.

FIG. 3 is a cross-sectional view of the vehicle seat tilt angle regulating mechanism as viewed in the direction of arrow 3-3 in FIG. 1;

FIG. 4 is a side view of the vehicle seat.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Lower arm, 12 ... Upper arm, 20 ... Reclining mechanism, 30 ... Inclination restriction mechanism, 21 ... 1st ratchet, 31 ... 2nd ratchet, 22 ... 1st pole, 32
… Second pole, 23… first cam, 33… second cam, 24
... release lever, 34 ... lock lever, 36 ... small gear, 37 ... handlebar, 38 ... stopper pin.

Claims (1)

(57) [Scope of request for utility model registration] A lower arm fixed to a seat cushion side and an upper arm fixed to a rear end of the lower arm at a lower end portion so as to be rotatable in the front-rear direction and fixed to a seat back side. A pawl that is disposed and fixed to the upper arm and rotates integrally with the upper arm; a pawl that is swingably assembled to the lower arm and meshes with and detaches from the ratchet; and a rotatable pivot on the lower arm. In a vehicle seat provided with a reclining mechanism having a release lever for releasing the engagement of the pawl with the ratchet by a rotating operation, the reclining mechanism of the reclining mechanism is rotatably attached to the two arms. A second ratchet coaxially located with the ratchet; and a second ratchet secured to the upper arm and projecting sideways. And a stopper pin provided on the lower arm and penetrating through an elongated hole facing the elongated hole of the ratchet, and the second ratchet is rotated. A vehicle seat comprising: an operating means; and an inclination regulating mechanism having a locking means for releasably locking the rotation of the second ratchet.