JP3200390B2 - Side bouncing slide sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide sheet which can be stored sideways.

[0002]

2. Description of the Related Art A rear seat (a second seat or a third seat) of an automobile has a seat back tilted rearward in order to enlarge a luggage compartment behind the rear seat, and is placed in a horizontal state.
There is a side-retractable storage type structure in which the entire rear seat is rotated so as to stand up around the outer end of the vehicle body of the seat cushion (see Japanese Utility Model Application Laid-Open No. 61-12837 as a similar technique).

[0003] In this type of rear seat, generally, only one end on the outside of the vehicle body serving as a rotation shaft is supported by a slide rail so as to be able to move back and forth, and a leg provided at the other end rests on the floor. Only. The legs can be folded down to the lower surface side of the seat cushion so that the rear seat does not protrude toward the luggage compartment when the rear seat is folded and stored.

[0004]

However, in such a conventional technique, only one end of the seat cushion is supported by a slide rail so as to be able to move back and forth, and the leg at the other end is mounted on the floor. When the rear seat is moved back and forth, the legs at the other end must be slightly lifted, which is troublesome.

Therefore, it is conceivable that the other end of the seat cushion is also supported by a slide rail so as to be movable back and forth. That is, one end of the seat cushion is rotatably supported on the first slide rail, and the other end is the second slide rail.
In this structure, the slide rail is supported so as to be freely detachable from the slide rail, and the other end is lifted around the one end so as to be in a horizontally recoiled state.

[0006] However, in the case of such a slide seat of the side-bounce-retractable type, after the other end of the seat cushion is detached from the second slide rail to be in the side-bounce-restored state,
When returning to the original state, if the second slide rail is displaced from the position at the time of disengagement, the other end of the seat cushion cannot be re-engaged with the second slide rail. For this reason, it is necessary to prevent both the displacement on the second slide rail side left on the floor and the displacement on the first slide rail side integral with the seat cushion when the vehicle is in the horizontal recoil storage state.

The present invention has been made by paying attention to such a conventional technique, and in particular, a horizontal recoil type slide which can surely prevent displacement of a first slide rail integrated with a seat cushion. A sheet is provided.

[0008]

According to the first aspect of the present invention,
One of the left and right ends of the seat cushion is freely movable back and forth by a first slide rail and is rotatably supported by the first slide rail, and the other end is freely movable back and forth by a second slide rail. And an operation part for releasing the first locking mechanism of the first slide rail is provided at one end of the seat cushion, and the operation part and the second The second lock mechanism of the slide rail is connected by the operating force transmitting means so that the second lock mechanism can be released at the same time as the first lock mechanism, and the second slide rail remains at the position where the other end of the seat cushion is detached. A slide seat capable of being stored in a horizontal recoil type, the other end of a seat cushion being attached to the first slide rail by a second slide. The stopper plate is provided rotated by disabling operation of the operation unit when detached from Lumpur.

According to the first aspect of the present invention, when the other end of the seat cushion is detached from the second slide rail, the operation portion becomes inoperable due to the stopper plate provided on the first slide rail. In the state that the seat cushion is in the horizontal recoiled state, even if the operator touches the operation unit by mistake, the first
There is no displacement of the slide rail and the seat cushion. Therefore, when returning the seat cushion to the original state, the other end of the seat cushion correctly re-engages with the second slide rail.

According to a second aspect of the present invention, the first slide rail is higher than the second slide rail, and the other end of the seat cushion is supported on the lower surface of the seat cushion so as to be freely foldable. Department.

According to the second aspect of the present invention, since the foldable legs are provided on the lower surface of the seat cushion, even if the height of the first slide rail and the height of the second slide rail are different, the seat cushion is provided. Can be reliably supported to be able to move back and forth. In the state in which the seat cushion is in the horizontal recoiled state, the legs do not protrude toward the expanded cargo compartment side when folded.

According to a third aspect of the present invention, a rail bracket is provided on a first movable rail of a first slide rail, and a seat bracket fixed to a seat cushion side is rotatably mounted on the rail bracket. The seat cushion is provided with a rotation lever coaxially rotating with the operation unit, a projection on the bottom surface of the rail bracket toward the seat bracket and a stopper plate urged toward the seat bracket. When the other end of the stopper plate is disengaged from the second slide rail, the tip of the stopper plate engages with the rotation lever to disable the operation unit, and when the other end of the seat cushion engages with the second slide rail, the stopper plate protrudes. Is pushed by the seat bracket to disengage the rotary lever.

According to the third aspect of the invention, when the other end of the seat cushion is detached from the second slide rail, the stopper plate rotates by its own biasing force and engages with the rotation lever. Since the rotating lever is coaxial with the operation unit,
By making the rotation lever unrotatable, the operation unit becomes inoperable. When the other end of the seat cushion is engaged with the second slide rail, the projection of the stopper plate is pushed by the seat bracket and rotated to the opposite side.
The engagement state between the stopper plate and the rotation lever is released. When the engagement state with the stopper plate is released, the rotation lever becomes a fleet, and the operation of the operation unit becomes possible.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention is shown in FIGS.
This will be described with reference to FIG. In the following description, the left and right "one ends" correspond to the outside of the vehicle body in the vehicle width direction, and the "other ends" correspond to the inside of the vehicle body in the vehicle width direction.

Reference numeral 1 denotes a rear seat (left seat) of a one-box vehicle, which comprises a seat cushion 2 and a seat back 3.

The seat back 3 can be greatly reclined to the rear side, and when the seat back 3 is tilted to the maximum, it is in a substantially horizontal state like the seat cushion 2. On the right side of the seat back 3 is also provided an armrest 4 to be used by leaning forward.

The floor 5 below the rear seat 1 has an outer side that is higher. A first slide rail 6 is provided at a higher portion of the floor 5 and a second slide rail 7 is provided at a lower portion.

The first slide rail 6 and the second slide rail 7 are respectively composed of a first fixed rail 8 and a second fixed rail 9 on the floor 5 side, and a first movable rail 10 and a second movable rail 11 on the rear seat 1 side. Consists of

First fixed rail 8 and second fixed rail 9
Have a channel shape in cross section, each having an opening along the longitudinal direction at the top.

The first movable rail 10 has an L-shaped cross section and has a second
The movable rail 11 has a T-shaped cross section,
(Refer to FIG. 4 and FIG. 7), the first fixed rail 8 and the second fixed rail 9 can be moved back and forth.

A rail bracket 13 is fixed on the upper surface of the first movable rail 10. The rail bracket 13 has a partially U-shaped cross section (see FIG. 7), and a connecting shaft 14 is inserted through the portion. An operation lever 15 as an “operation unit” is provided outside the connection shaft 14.
Are fixed, and a rotating lever 16 is fixed to the inner end, and both perform the same movement.

The operation lever 15 is provided with a spring S1 for pulling the cam portion 17 to the rear side to prevent the operation lever 15 from rattling.

On the upper part of the operation lever 15, there is provided a grip portion 18 for rotating it backward by hand. The cam portion 17 has a first cam surface 17a and a second cam surface 17b. Is formed. The first cam surface 17a is slanted with respect to an arc centered on the connecting shaft 14, and the second cam surface 17b matches the arc.

Further, on the bottom surface of the rail bracket 13,
A stopper plate 48 is pivotally supported. The stopper plate 48 has a front end pivoted, and is biased by a spring S3 to rotate the rear end toward the seat cushion 2 side.

At the tip of the stopper plate 48, a notch 4
9 is formed and engages with the front end of the rotating lever 16 to prevent the rotating lever 16 from rotating.

The stopper plate 48 is integrally formed with a projection 50 projecting toward the seat cushion 2, and when the projection 50 is pressed, the stopper plate 48 rotates toward the first slide rail 6. Then, the engagement between the notch 49 and the rotary lever 16 is released.

The first movable rail 10 is provided with a first action lever 19 whose center is pivotally supported and whose both ends can swing up and down. A first pin 20 is provided at the front end of the first action lever 19 to abut the cam portion 17 of the operation lever 15, and the rear end is pivotally supported by a first interlock 21.

The first interlock 21 has a plurality of notches 8a formed in the bottom surface of the first fixed rail 8 (see FIG. 6).
And at an arbitrary position to lock the first movable rail 10 from moving forward and backward with respect to the first fixed rail 8. By the first interlock 21 and the first action lever 19, the "first
A lock mechanism is configured.

A downward biasing force is constantly applied to the first interlock 21, and the locked state with respect to the first fixed rail 8 is maintained.

When the operation lever 15 is rotated by pulling the grip portion 18 backward, the first cam surface 17a
By pushing down 0, the rear end of the first action lever 19 is lifted together with the first interlock 21, and the locked state with respect to the first fixed rail 8 is released.

The first pin 20 is lowered by a slight stroke d1 pressed on the first cam surface 17a (see FIG. 5), and is not further lowered on the second cam surface 17b. Preventing.

As described above, even when the first cam surface 17a is pressed down by a slight stroke d1, the operation lever 15 is directly engaged with the first pin 20 of the first action lever 19, which is the "first lock mechanism". Therefore, the first interlock 21 can be reliably released.

At the front and rear ends of the rail bracket 13 on which the operation lever 15 is provided, a seat bracket 22 is supported by a rotation axis X. This seat bracket 22
Is fixed to the frame 23 of the seat cushion 2 and is integrated with the seat cushion 2.

On the outer vertical wall of the seat bracket 22,
A curved long hole 24 is formed. A portion corresponding to the elongated hole 24 has a first swing lever 25 whose lower end is pivotally supported.
A second pin 26 located in the elongated hole 24 is provided at an upper end of the first swing lever 25. The first swing lever 25 is constantly urged rearward by a spring 27 provided on the rotation shaft.

The lower end of the rotary lever 16 is located behind the second pin 26 of the first swing lever 25. When the operation lever 15 is rotated, the second pin 26 of the first swing lever 25 is pushed forward by the rotation lever 16 by a stroke d2 corresponding to the elongated hole 24 (see FIG. 7).

On the other hand, on the frame 23 on the inner side in the vehicle width direction of the seat cushion 2, a leg portion 28 that can be entirely folded toward the lower surface side of the seat cushion 2 around the upper end is pivotally supported.

The legs 28 are for compensating for the difference in the vertical height between the first slide rail 6 and the second slide rail 7. A spring (not shown) is provided at a rotation fulcrum of the leg 28 with respect to the frame 23, and can hold a state where the leg 28 is pulled out from the lower surface of the seat cushion 2 and rotated and a state where the leg 28 is folded on the lower surface with a constant urging force. It has become.

When the leg portion 28 is pulled out, its lower end is connected to the second movable rail 11 of the second slide rail 7.
Can be attached to and detached from.

A T-shaped lever 29 which is rotatable about a fulcrum 29a at the center is provided at a position near the front of the leg 28. The lower end of the T-shaped lever 29 is pivotally supported near the lower end of the second swing lever 30. The second swing lever 30 has a large vertical size H, and the lower end 31 swings about a fulcrum 30a at the upper end thereof. Between the upper end of the second swing lever 30 and the front end of the T-shaped lever 29, there is provided a spring S2 for pulling the both, and the spring S2 prevents rattling of both.

The rear end of the T-shaped lever 29 and the upper end of the first swing lever 25 located outside the vehicle body are connected by a wire 32. This wire 32 is covered with an outer tube 33 having both ends fixed, and the amount of movement of the wire 32 relative to the outer tube 33 on one side is transmitted to the other side regardless of the path or the degree of bending. However, some errors occur due to the relationship between the wire 32 and the inner diameter of the outer tube 33.

The "operating force transmitting means" of this embodiment includes the wire 32, the T-shaped lever 29, the second swing lever 30,
It is formed by the first swing lever 25, the rotation lever 16, and the like.

Therefore, when the grip lever 18 is pulled rearward to rotate the operation lever 15, the rotation lever 16 rotates integrally, and the lower end of the first pin 20 of the first swing lever 25 is elongated. 24, the first swing lever 25 swings forward, pulls the wire 32 by a predetermined stroke d2, and pushes the T on the leg 28 side.
The shape lever 29 is rotated.

When the T-shaped lever 29 rotates, the lower end 31 of the second swinging lever 30 also swings rearward about the upper fulcrum 30a. Since the vertical size H from the fulcrum 30a of the second swing lever 30 to the lower end 31 is large, the lower end 31 of the second swing lever 30 rotates rearward in a large arc close to horizontal movement.

A U-shaped striker 34 is welded to the rearward position of the leg 28. The leg 28 is detachably attached to the second slide rail 7 using the striker 34.

An opening (not shown) is formed in a portion of the second movable rail 11 corresponding to the striker 34, and the striker 34 is inserted from the opening to the inside of the second movable rail 11.

The striker 34 of the second movable rail 11
Is provided with a catch 35 rotatable about a fulcrum 35a. The upper portion of the catch 35 has a hook shape having an engagement recess, and the striker 34 is engaged with the engagement recess.

The catch 35 is constantly urged in a direction of detaching from the striker 34 (to rotate forward), and is rotated in the detaching direction of the catch 35 by a cam 36 which is engaged with a recess 35b of the catch 35. Has been prevented.

The rotating shaft of the cam 36 is provided with an auxiliary plate 37 whose front end is coaxially supported. The rear end of the auxiliary plate 37 is pivotally supported at a position behind the fulcrum 35a at the lower end of the catch 35, and is pressed downward by the striker 34, thereby forcibly rotating the catch 35 in the engagement direction. Let it. A convex portion 38 is formed in front of the lower end of the catch 35, and the catch 3
5 rotates in the disengagement direction, engages with a groove (not shown) formed on the bottom surface of the second fixed rail 9, and causes the second movable rail 11 to rotate.
Can be locked with respect to the second fixed rail 9.

A release rod 39 is connected to the cam 36 for preventing the catch 35 from rotating in the detaching direction, and a front end of the release rod 39 has a release portion 40.
And protrudes forward of the second movable rail 11.

The release rod 39 is moved in the direction in which the cam 36 is engaged with the catch 35 (toward the rear side).
Being energized. Then, the cam 36 is disengaged from the recess 35b of the catch 35 by pulling the release portion 40 forward and moving the release rod 39 forward.
The catch 35 rotates in the detaching direction by the urging force, and the engagement with the striker 34 is released.

At a position slightly forward of the catch 35 on the vertical surface of the second movable rail 11, a second action lever 41 whose lower end is pivotally supported and whose front end swings up and down and whose upper end swings back and forth. Is provided. A second interlock 42 is supported at the front end of the second action lever 41. The second interlock 42 is engaged with a plurality of grooves (not shown) formed in the bottom surface of the second fixed rail 9 at an arbitrary position, and locks the forward and backward movement of the second movable rail 11 with respect to the second fixed rail 9. I do.

A rear end of a push rod 43 extending horizontally horizontally is supported at the upper end of the second action lever 41. An opening (not shown) is formed near the front end of the push rod 43, and the lower end 31 of the second swing lever 30 in the leg 28 is inserted through the opening. The push rod 43, the second interlock 42, and the second action lever 41 constitute a "second lock mechanism".

A downward biasing force is always applied to the second interlock 42, and the second interlock 42
The locked state with respect to the fixed rail 9 is maintained.

Then, the lower end 31 of the second swing lever 30
Pushes the front end of the push rod 43 backward, the second action lever 41 rotates, and the second interlock 42
, The second movable rail 11 can be moved back and forth with respect to the second fixed rail 9.

A detachable belt hook 46 is provided at a position closer to the inside of the lower surface of the seat cushion 2 (see FIG. 1). The belt hook 46 can be detached from the seat cushion 2 and hooked on the assist grip 47 of the vehicle body in order to hold the seat cushion 2 in the horizontally recoiled state.

Next, the operation of the slide sheet of this embodiment in each state will be described with reference to FIGS.

Normal seating state (see FIG. 7): In the normal seating state, on the first slide rail 6 side, the first interlock 21 is engaged with the first fixed rail 8 and the second slide rail 7 On the side, since the second interlock 42 is engaged with the second fixed rail 9, the forward / backward movement of the rear seat 1 is locked. The striker 34 of the leg 28
Since the seat cushion 2 is also engaged with the catch 35, the seat cushion 2 does not bounce sideways. The lower end 31 of the second swing lever 30 is inserted into the front end of the push rod 43 from above.

In this state, the projection 50 of the stopper plate 48 is pushed by the seat bracket 22 and is rotated to the opposite side.
Is released. Therefore, the rotation lever 16 becomes a fleet, and the operation of the operation lever 15 becomes possible.

Operation state of operation lever 15 (see FIG. 8):
When the grip portion 18 is pulled backward by hand and the operation lever 15 is rotated, the cam portion 17 and the rotation lever 16 are simultaneously rotated. The cam portion 17 is the first of the first action lever 19
The pin 20 is pushed down by a small stroke d1. When the first pin 20 is lowered, the first interlock 21 is raised, and the lock of the first slide rail 6 is released.

The rotating lever 16 is provided with the first swing lever 2.
5 is pushed with a large stroke d2. Then, the wire 32 is pulled, and the T-shaped lever 29 and the second
The swing lever 30 rotates, and the push rod 43 is pushed by the substantially horizontal movement of the lower end 31 of the second swing lever 30. When the push rod 43 is pressed, the second action lever 41 rotates, the second interlock 42 is lifted, and the lock of the second slide rail 7 is released. As described above, since both the first slide rail 6 and the second slide rail 7 can be unlocked simultaneously by the rotation of the operation lever 15, the occupant can move the rear seat 1 back and forth while sitting.

Separation state from second slide rail 7 (see FIG. 9): Next, when the leg portion 28 is detached from the second slide rail 7 and the rear seat 1 is to be stored horizontally, the second slide rail is required. Release section 40 in front of 7
To move the release rod 39 forward. Then, the cam 36 is disengaged from the recess 35b of the catch 35, and the catch 35 is rotated by its own urging force, and disengaged from the striker 34. The projection 38 of the catch 35 engages with a groove (not shown) of the second fixed rail 9 to lock the second slide rail 7.

Since the catch 35 and the striker 34 are disengaged from each other, the entire rear seat 1 is
Can be lifted about the rotation axis X between the rail bracket 13 and the rail bracket 13 so as to be in a horizontal recoil storage state. Lifting of the rear seat 1 is performed after the seat back 3 is tilted rearward to be horizontal.

When the leg 28 is separated from the second slide rail 7, the push rod 43 cannot be pushed, so that the locked state of the second slide rail 7 is maintained.
As described above, since the engagement is also performed by the projection 38 of the catch 35, the locked state of the second slide rail 7 is reliably maintained.

Therefore, even if the luggage is put on the floor 5 used as a luggage compartment and the luggage hits the second slide rail 7, the state of the second slide rail 7 does not change after the side bounce storage state. Also on the first slide rail 6 side, since the first interlock 21 is engaged with the first fixed rail 8 by its own urging force, the locked state of the first slide rail 6 is maintained. Therefore, the rear seat 1 in the side recoil storage state does not move back and forth.

When the leg 28 is detached from the second slide rail 7, the stopper plate 48
3 rotates and the notch 49 is
6 with the leading edge. The rotation lever 16 is the operation lever 15
, The operation lever 15 becomes inoperable. Therefore, when the seat cushion 2 is set to the side recoil storage state,
Even if the operation lever 15 is touched by mistake, the first slide rail 6 and the seat cushion 2 do not shift.

Further, in the state of the horizontal recoil, the second pin 26 on the side of the seat bracket 22 separates from the rotating lever 16 on the side of the rail bracket 13 and becomes irrelevant (FIG. 4).
), The seat cushion 2 can be lifted freely. When the rear seat 1 is lifted up and enters the side-up storage state, the belt hook 46 is hooked on the assist grip 47 on the side wall of the vehicle body, so that the side-up storage state is maintained. Since the leg 28 is folded to the lower surface side of the seat cushion 2, it does not protrude toward the enlarged cargo room.

As described above, since both the first slide rail 6 and the second slide rail 7 are locked at the position where the seat cushion 2 is in the state of the horizontal recoil, when the seat cushion 2 is returned, the leg portions 28 are required. And the second slide rail 7
Re-engage exactly. The striker 34 of the leg 28 is accurately aligned with the catch 35 of the second slide rail 7, and when the striker 34 presses the auxiliary plate 37, the catch 35 stands up against the urging force and re-engages with the striker 34. I do. When the catch 35 rises,
Accompanying this, the cam 36 also engages in the recess 35b with its own urging force, and the engagement state of the catch 35 is maintained.

[0068]

According to the first aspect of the present invention, when the other end of the seat cushion is detached from the second slide rail, the operation portion cannot be operated by the stopper plate provided on the first slide rail. Therefore, in the state where the seat cushion is in the sidewardly retracted state, the first slide rail and the seat cushion will not be displaced even if the operation part is accidentally touched. Therefore, when returning the seat cushion to the original state, the other end of the seat cushion correctly re-engages with the second slide rail.

According to the second aspect of the present invention, since the foldable legs are provided on the lower surface of the seat cushion, even if the height of the first slide rail and the height of the second slide rail are different, the seat cushion is provided. Can be reliably supported to be able to move back and forth. In the state in which the seat cushion is in the horizontal recoiled state, the legs do not protrude toward the expanded cargo compartment side when folded.

According to the third aspect of the invention, when the other end of the seat cushion is detached from the second slide rail, the stopper plate rotates by its own biasing force and engages with the rotation lever. Since the rotating lever is coaxial with the operation unit,
By making the rotation lever unrotatable, the operation unit becomes inoperable. When the other end of the seat cushion is engaged with the second slide rail, the projection of the stopper plate is pushed by the seat bracket and rotated to the opposite side.
The engagement state between the stopper plate and the rotation lever is released. When the engagement state with the stopper plate is released, the rotation lever becomes a fleet, and the operation of the operation unit becomes possible.

[Brief description of the drawings]

FIG. 1 is a front view showing a rear seat.

FIG. 2 is a plan view showing a rear seat.

FIG. 3 is a side view showing a rear seat.

FIG. 4 is a sectional view taken along the line SA-SA shown in FIG. 2;

FIG. 5 is a side view of the first lock mechanism viewed from a direction indicated by an arrow DA in FIG. 4;

FIG. 6 is a side view of the first lock mechanism viewed from a direction indicated by an arrow DB in FIG. 4;

FIG. 7 is a side view of a normal seating state showing a related structure of a second slide rail, a leg, a seat bracket, and a rail bracket.

FIG. 8 is a side view corresponding to FIG. 7, showing an operation state of the operation lever.

9 is a side view corresponding to FIG. 7, showing a state in which the operating lever is detached from the second operating force transmitting means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rear seat 2 Seat cushion 6 1st slide rail 7 2nd slide rail 10 1st movable rail 11 2nd movable rail 13 Rail bracket 15 Operation lever (operation part) 15a Notch (stopper) 16 Rotation lever 17 Cam part 19 1st Action lever (first lock mechanism) 20 First pin 21 First interlock (First lock mechanism) 22 Seat bracket 26 Second pin 28 Leg 30 Second swing lever 31 Lower end 32 Wire (operating force transmitting means) 33 outer tube 34 striker 35 catch 38 convex part 41 second action lever (second lock mechanism) 42 second interlock (second lock mechanism) 43 push rod (second lock mechanism) 48 stopper plate 49 notch 50 projection d1 d2 Moving stroke H 'S

Claims (3)

(57) [Claims] 1. A left and right end of a seat cushion is rotatably supported by a first slide rail and is rotatably supported by the first slide rail, and the other end is supported by a second slide rail. An operation portion for releasing the first lock mechanism of the first slide rail is provided at one end of the seat cushion, the operation portion being provided so as to be movable back and forth and to be detachable from the second slide rail. And the second lock mechanism of the second slide rail by an operating force transmitting means to connect the second lock mechanism to the first lock mechanism.
The second slide rail can be released at the same time as the lock mechanism, and the second slide rail is a horizontal recoil storage type slide sheet in which the position where the other end of the seat cushion is detached is maintained as it is. And a stopper plate that rotates when the other end of the seat cushion separates from the second slide rail and that disables the operation unit. 2. The slide seat according to claim 1, wherein the first slide rail is at a higher position than the second slide rail, and the other end of the seat cushion is a lower surface of the seat cushion. A side-retractable slide sheet, characterized in that the slide sheet is a leg that is pivotally supported so as to be freely foldable. 3. The slide seat according to claim 1, wherein a rail bracket is provided on the first movable rail of the first slide rail, and the rail bracket is fixed to the seat cushion side. The seat bracket is rotatably mounted, the rail bracket is provided with an operation unit, and a rotation lever coaxially rotating with the operation unit is provided. The rail bracket has a projection toward the seat bracket on the bottom surface and toward the seat bracket. The biased stopper plate is pivotally supported, and when the other end of the seat cushion is detached from the second slide rail, the tip of the stopper plate engages with the rotating lever to make the operation unit inoperable. At the time of engagement with the second slide rail, the projection of the stopper plate is pushed by the seat bracket and Horizontal splashes housing SSs, characterized in that the engaged state.