JP3303726B2 - 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 foldable vehicle seat mounted on a vehicle such as an automobile.

[0002]

2. Description of the Related Art For example, as described in Japanese Utility Model Publication No. Hei 4-20668, in a vehicle in which a rear seat or the like can be folded as required, a front end side of a seat cushion is hinged to a floor of a vehicle body. There is known a device which is supported so that it can be turned upside down and a seat back is provided so as to be able to fall forward. When folding this type of seat, the seat back is folded forward and stacked on the seat cushion, and then the seat cushion is flipped forward (standing) integrally with the seat back, and the movement of the link mechanism or hook mechanism is performed. The upright state was kept by the stopping means.

[0003]

However, even if the upright state of the seat cushion is maintained by using the above-described movement stopping means, there is inevitably a small clearance between the hinge shaft and the movement stopping means. Since there is (play) and the seat cushion itself is heavy, there is a problem that the seat cushion in the upright state is likely to rattle in the front-rear direction while the vehicle is running, and noise is generated. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle seat that can prevent a seat folded and standing upright from shaking or rattling.

[0004]

A vehicle seat according to the present invention for achieving the above object is as defined in claim 1. When the seat cushion is erected to fold the seat of the present invention, the leg mechanism pivots from the use position to the storage position by linking the link mechanism as the seat cushion moves in the erecting direction. The seat cushion is prevented from falling down by the holding means in the upright state, and is attached to the link bar.
The elastic member makes elastic contact with the member on the seat cushion side.

When a link mechanism having a link bar and an elastic member such as rubber is adopted as described in claim 1 ,
When the seat cushion is raised, the elastic member provided on the link bar elastically contacts the member on the seat cushion side, so that the holding means is urged in a direction for maintaining the seat cushion in the upright state.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The seat 10 applied to the rear seat of the vehicle shown in FIG. 4 includes a seat cushion 11 and a seat back 12 (only a part is shown) provided at a rear portion of the seat cushion 11.
The front end side of the seat cushion 11 is attached to a hinge base (floor-side member) 14 fixed to a floor 13 of the vehicle body so as to be rotatable in a vertical direction by a hinge 15.
That is, the seat cushion 11 is changed from the seated down state shown in FIG. 4 to the folded state (standing position) shown in FIG.
Are provided so as to be able to be turned over.

[0007] The seat back 12 is a seat cushion 1.
Seat back hinge 16 provided on the other end side (rear end side)
The seat back 12 is configured to be rotatable in the front-rear direction so that the seat back 12 overlaps the seat cushion 11 when the seat back 11 is tilted forward.

A leg base 21 is provided at the rear end of the frame 20 of the seat cushion 11. This leg base 2
A leg 23 is attached by a shaft 22 provided at 1 so as to be rotatable in the front-rear direction. A lock member 24 having a hook portion is provided at the lower end side of the leg portion 23, and when the seat cushion 11 is in a down state as shown in FIG. 4, the lock member 24 engages with a member 25 on the floor side. Thereby, the leg 23 can be fixed at the use position. By operating the operation unit 26 provided on the lock member 24 in the unlocking direction, the lock member 24 can be removed from the member 25 on the floor side.

When the seat cushion 11 is upright as shown in FIG. 1, the leg 23 is held at the storage position by retracting to the seat cushion 11 via a link mechanism 50 described later. When the seat cushion 11 is in the tilted state shown in FIG. 4, the seat cushion 11 is rotated to the use position via the link mechanism 50. That is, the leg 23 is rotatable between the use position and the storage position.

The hinge 15 provided at the front end of the seat cushion 11 includes a hinge base 14 fixed to the floor 13 of the vehicle body, a hinge bracket 30 fixed to the front of the frame 20 of the seat cushion 11, and a hinge base. 1
4 and a hinge bracket 31 in a horizontal direction for connecting the hinge bracket 30 to the hinge bracket 30 so as to be relatively rotatable. When the rear end side of the seat cushion 11 is lifted, the seat cushion 11 can rotate around the hinge shaft 31 until the seat cushion 11 stands upright in front of the vehicle body.

The seat cushion 11 and the hinge base 14
Is provided with a holding mechanism 35 functioning as holding means. This holding mechanism 35 is used for the seat cushion 1.
When the seat cushion 1 is in the upright state, the seat cushion 11 has a function of holding the seat cushion 11 in the upright state by restricting the seat cushion 11 from falling down.

One example of the holding mechanism 35 is the hinge base 14.
, A first link 38 rotatably attached to the fixed bracket 36 by a first shaft 37, and a second shaft 39 on the other end of the first link 38. A second link 40 rotatably attached to the second link 40, and a support member 41 on the seat cushion 11 side.
A third shaft portion 42 rotatably connected to the second link 4
It is provided with a spring 43 and the like for urging 0 in the direction of the hinge shaft 31.

As shown in FIG. 4, when the seat cushion 11 is in an inclined state in which the seat cushion 11 can be seated, the holding mechanism 35
The link 38 and the second link 40 are bent in a V shape. When the seat cushion 11 is raised up to the folded position shown in FIG. 1, the shafts 37, 39, and 42 are slightly displaced from the neutral position in a straight line to the opposite side, so that the first link 38 and the first link 38 are displaced. The two links 40 are stretched substantially in a straight line, and the second link 40 comes into contact with the stopper wall 38a of the first link 38 as shown in FIG.

Further, when the seat cushion 11 is in the above-mentioned folded position (standing state), the spring 43 is stretched between the fixed bracket 36 and the second link 40,
Due to the repulsive load, the holding mechanism 35 is urged in a direction in which the second link 40 contacts the stopper wall 38a of the first link 38, that is, a direction in which the locked state is maintained. Therefore, once the seat cushion 11 is in the upright state, the first link 38 and the second link 40 are kept in the upright state by linearly projecting.

To release the standing state, for example, the second
The operation unit 44 (shown in FIG. 3) provided on the link 40 is operated in the direction of arrow R in FIG.
By bending the 8 and the second link 40 in a V-shape beyond the neutral position, the locked state of the holding mechanism 35 is released, and the seat cushion 11 can be returned to the tilted state of FIG.

The hinge base 14 and the leg 23 are connected to each other by a link mechanism 50. The link mechanism 50 includes a link bar 51 made of a rod-shaped metal material or the like.
And an elastic member 52 made of a rubber-like elastic material provided at an intermediate portion in the longitudinal direction of the link bar 51. One end 51 a of the link bar 51 is rotatably supported by a shaft 53 provided on the leg 23. The other end 51 b of the link bar 51 is rotatably supported by a shaft 54 provided on the hinge base 14.

The link bar 51 of the link mechanism 50 is
When the seat cushion 11 is raised, the seat cushion 11 moves along with the behavior of the seat cushion 11. That is, when the seat cushion 11 is in the tilted state shown in FIG. 4, the link bar 51 holds the leg 23 in the use position by pushing the leg 23 backward, but when the seat cushion 11 is turned to the upright state shown in FIG. The length of the link bar 51 and the positions of the shafts 53 and 54 are set so that the leg 23 rotates to the storage position by pulling the link bar 51 relatively downward.

The elastic member 52 is provided at a position where it can come into contact with a part 60 of the seat cushion 11 when the seat cushion 11 is in the upright state. When the seat cushion 11 is erected, the elastic member 52 elastically contacts the part 60 of the frame 20 to maintain the erected state of the seat cushion 11 as will be described later. The holding mechanism 35 is biased in the direction of pressing against the stopper wall 38a.

Next, the operation of the vehicle seat 10 having the above configuration will be described. As shown in FIG. 4, when the seat cushion 11 is in a tilted state in which it can be seated, the leg 23 is rotated to the use position, and the leg 23 keeps the seat cushion 11 in a predetermined posture. The leg 23 is fixed to the use position by the engagement of the lock member 24 with the member 25 on the floor side. The seat back 12 is held in an upright posture by a lock mechanism (not shown).

In order to fold the seat 10, the seat back 12 is tilted forward, and the seat cushion 11 is erected forward as shown in FIG. Seat cushion 1
When the link 1 is turned in the upright direction, the link bar 51 is pulled relatively downward, so that the leg 23 turns from the use position to the storage position.

When the seat cushion 11 is completely erected, the first link 38 and the second link 40 are displaced to the opposite side slightly beyond the neutral position where the shaft portions 37, 39, 42 are aligned in a straight line. As shown in FIG. 3, the second link 40 comes into contact with the stopper wall 38a of the first link 38, while being in a state of being stretched substantially in a straight line. Therefore, falling down of the seat cushion 11 is restricted.

Moreover, the elastic member 5 provided on the link bar 51
2 elastically contacts the part 60 of the seat cushion 11, the elastic member 52 is compressed and bent, and the reaction force acting on the link bar 51 generates a tension in a direction in which both ends 51 a and 51 b of the link bar 51 attract each other. , A force F (shown in FIG. 1) for pulling the leg 23 downward is generated.

As a result, a large clockwise moment M about the hinge shaft 31 is generated above the seat cushion 11 in the upright state, and the holding mechanism 35 is urged in a direction to maintain the upright state of the seat cushion 11. Is done. That is, the holding mechanism 35 connects the second link 40 to the first link
The link 38 is urged in the direction of pressing against the stopper wall 38a (the direction of locking).

In this case, the distance L1 from the hinge shaft 31 supporting the seat cushion 11 to the shaft 53 of the leg 23 is defined as L1.
Has a span sufficiently longer than the distance L2 from the hinge shaft 31 to the shaft portion 42 of the second link 40, so that the second link 4 is attached to the stopper wall 38a of the first link 38.
0 will be pressed with a large force. For this reason, the seat cushion 11 in the upright state is suppressed from shaking or rattling during traveling of the vehicle.

In contrast to such an embodiment, when the link bar 51 is not provided with the elastic member 52 as in the prior art, a force for pushing the link bar 51 from the side is not generated, and the link bar 51 is free to some extent. In this state, the force F for pushing down the link bar 41 and the moment M do not occur. Therefore, when the elastic member 52 is not provided, the seat cushion 11 is held upright only by the links 38 and 40 of the holding mechanism 35, and the distance L2 from the shaft portion 42 of the link 40 to the hinge shaft 31 is reduced. Because it is short,
When vibration or the like during running of the vehicle is applied, it may not be possible to prevent the seat cushion 11 from shaking or rattling.

Thus, according to the above-described embodiment, the leg 2
Link bar 5 as an interlocking means that functions when folding 3
By simply adding an elastic member 52 made of rubber or the like to 1, it is possible to effectively prevent the seat cushion 11 from shaking or rattling when standing up. Since the link bar 51 can be restrained by the seat cushion 11 via the elastic member 52, it is possible to prevent the link bar 51 and the leg 23 from rattling.

In order to return the seat cushion 11 to the tilted state, the operating portion 44 is operated in the direction of the arrow R in FIG. 5 so that the links 38 and 40 are bent in a V shape beyond the neutral position, and the seat cushion 11 is moved. You only have to fall it horizontally.

In carrying out the present invention, it goes without saying that various elements constituting the present invention, such as a seat cushion, a leg, a holding means, a link mechanism, an elastic member, and the like, can be variously modified.

[0029]

According to the first aspect of the present invention, it is possible to prevent the seat cushion in the upright state from shaking or rattling during traveling of the vehicle, and to avoid generation of abnormal noise and noise.

Further , according to the present invention, the seat cushion and the link have a simple structure in which an elastic member is simply added to the link bar for rotating the leg to the retracted position in conjunction with the standing operation of the seat cushion. It is possible to effectively prevent rattling of a mechanism or the like.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a seat according to an embodiment of the present invention is folded.

FIG. 2 is an enlarged side view showing a part of the sheet shown in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a side view showing a use mode of the sheet.

FIG. 5 is a side view of the seat cushion of the seat in the process of returning from the upright state to the down state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Seat 11 ... Seat cushion 12 ... Seat back 23 ... Leg 35 ... Holding mechanism (holding means) 50 ... Link mechanism 51 ... Link bar 52 ... Elastic member

Claims (4)

(57) [Claims] 1. A seat cushion, one end of which is attached to a floor via a hinge so as to be capable of being turned upside down, a shaft supported by the other end of the seat cushion, and fixed to the floor when the seat cushion is in a down state. A leg portion rotatable between a use position to be used and a storage position retracted to the seat cushion side when the seat cushion is raised, holding means for holding the seat cushion in an upright state, and the leg portion. A link bar that connects the member on the floor side of the hinge to rotate the leg to the storage position when the seat cushion is erected; and a link bar provided on the link bar to raise the seat cushion.
Being in contact with a part of the seat cushion when standing
The vehicle seat being characterized in that anda resilient member for biasing the seat cushion in a direction standing state of the seat cushion is maintained by the holding means. 2. The holding means includes a first ring having one end rotatably mounted on the hinge side.
And one end is rotatably connected to the seat cushion side.
And the other end is pivotally attached to the other end of the first link.
Provided on the second link and the first link,
When the cushion comes up, it comes into contact with the second link.
A top wall, wherein the elastic member urges the second link in a direction of pressing the second link against the stopper wall.
The vehicle seat according to claim 1, wherein: 3. A hinge supporting the seat cushion.
The distance (L1) from the axis to the axis of the leg is
From the distance (L2) to the shaft of the second link.
3. The vehicle seat according to claim 2, wherein
G. 4. The second link is urged in the direction of the hinge.
3. A spring according to claim 2, wherein a spring is provided.
Vehicle seat.