JP2014151769A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce fatigue, pain and the like by assisting a blood flow by a change in seat pressure by making a seat pad movable with proper performance.SOLUTION: A seat pad 4P includes a movable part 34 that can be brought into contact with an occupant in a seating state, and a stationary part 30 that is arranged on the periphery of the movable part 34. When the seat pad 4P is arranged on a seat frame 4F, the stationary part 30 is fixed to the seat frame 4F while the movable part 34 can be relatively moved via repulsion (MM) of a magnetic force with respect to the seat frame 4F.

Description

  The present invention relates to a vehicle seat in which a seat pad (a member that forms a seat outer shape and elastically supports an occupant) is movable.

In this type of vehicle seat, when the occupant is in the same posture for a long time, the blood flow in the portion in contact with the seat may stagnate and feel fatigue or pain.
For this reason, the occupant responds by changing his / her posture as appropriate, but at this time, for example, the seat pad (a member that elastically supports the occupant) can follow the movement of the occupant and support the occupant's posture displacement. Is desirable.

For example, in the vehicle seat disclosed in Patent Document 1, a cushion (corresponding to a seat pad) can be moved relative to the passenger compartment floor surface in the seat width direction via a guide rail. Here, the guide rail is a bar member extending in the seat width direction. Further, a hanging member (substantially U-shaped flat plate material) projects from the lower part of the cushion, and a guide rail can be inserted.
In the technique of Patent Document 1, a pair of guide rails are arranged in parallel on the left and right sides of the seat while being fixed to the vehicle compartment floor surface side via standing members (bars). And while arranging a cushion on a pair of guide rails, each guide rail is fitted to the hanging member so as to be relatively movable. By doing so, the entire cushion can be relatively moved along the pair of guide rails in the seat width direction in accordance with the posture displacement of the occupant.

Japanese Patent No. 4095583

By the way, in a well-known technique, it is the structure which the cushion cushion (seat pad) whole moves relatively in a seat width direction. For this reason, for example, when the vehicle is traveling, the seating posture may be disturbed due to excessive movement of the occupant together with the seat pad (the seat configuration is slightly lacking in support performance).
Further, in the configuration of the known technique, since a guide rail (a relatively large member) or a hanging member is used, the configuration is not easily adoptable from the viewpoint of simplifying the seat configuration.
The present invention was devised in view of the above points, and the problem to be solved by the present invention is to make the seat pad movable with good performance, thereby promoting blood flow by changing seat pressure, The purpose is to reduce pain.

As means for solving the above-described problems, the vehicle seat of the first invention includes a seat constituent member such as a seat cushion or a seat back. The seat constituent member includes a seat frame that forms a seat skeleton, and a seat pad that forms a seat outer shape and can elastically support an occupant.
In the present invention, the seat pad is movable (movable relative to the seat frame) to displace the occupant and support the posture. In this type of seat configuration, it is desirable that the seat pad can be moved with good performance (for example, with good supportability), whereby blood flow can be promoted by changes in seat pressure to reduce fatigue and pain.

So, in this invention, the above-mentioned seat pad has the movable part which can contact the passenger | crew at the time of a seating state, and the fixed part arrange | positioned around a movable part. When the seat pad is disposed on the seat frame, the movable portion is disposed so as to be relatively movable with respect to the seat frame through the repulsive force of the magnetic force, and the fixed portion is fixed to the seat frame.
In the present invention, the position of the occupant is displaced and the support performance of the seat pad is suitably maintained at the fixed portion, and the movable portion is relatively moved by the repulsive force of the magnetic force (by a relatively simple means). be able to.

The vehicle seat of the second invention is the vehicle seat of the first invention, and has a limiting mechanism for limiting relative movement of the movable part in the separating direction with respect to the seat frame.
In the present invention, the limit mechanism can prevent the movable portion from being separated (dropped off) from the seat frame as much as possible (a configuration excellent in attachment stability).

The vehicle seat of the third invention is the vehicle seat of the first invention or the second invention, wherein the seat back is connected to the seat cushion via the reclining mechanism so as to be able to rise and fall. And a movable part is the structure which can move relatively large gradually in a sheet | seat width direction as it goes to the reclining mechanism side from the edge part side of a sheet | seat structural member.
In the present invention, the movable part can be relatively moved relatively largely on the reclining mechanism side (part that easily comes into contact with the occupant). Further, the movable part relatively moves relatively on the end side of the sheet constituent member (becomes excellent in supportability).

  According to the first invention of the present invention, by making the seat pad movable with high performance, it is possible to promote blood flow by changing the seating pressure and reduce fatigue, pain, and the like. According to the second invention, the seat pad can be made more movable. And according to the 3rd invention, a seat pad can be made still more movable.

It is a perspective view of a vehicle seat. It is a disassembled perspective view of a seat cushion. It is sectional drawing of a part of seat cushion. It is a perspective view of a part of seat cushion. It is a disassembled perspective view of the seat cushion of Example 2. FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS. Also, in each figure, a reference symbol F is attached to the front of the vehicle seat, a reference symbol B is attached to the rear of the vehicle seat, a reference symbol UP is provided above the vehicle seat, and a reference symbol DW is provided below the vehicle seat.
The vehicle seat 2 in FIG. 1 includes a seat component (seat cushion 4, seat back 6, headrest 8) and a reclining mechanism RM.
Each of the seat constituent members includes a seat frame (4F, 6F, 8F) forming a seat skeleton, a seat pad (4P, 6P, 8P) forming a seat outer shape, and a seat cover (4S, 6S, 8S) covering the seat pad. ).
The reclining mechanism RM is a mechanism that connects the seat back 6 to the seat cushion 4 so that the seat back 6 can be tilted, and has a reclining axis R that serves as a center of rotation when tilting.

<Example 1>
The seat cushion 4 of the present embodiment has a basic configuration (4F, 4P, 4S), a seating portion 4a, a bank portion 4b, a magnetic force mechanism MM, and a limiting mechanism CM (see FIGS. 1 to 3, each) Details of the members will be described later).
Here, the seating portion 4a is a flat portion (substantially rectangular in top view) where an occupant can be seated, and can be formed at the center of the seat cushion 4. In this embodiment, the occupant's buttocks in the seated state are in contact with each other at the center position of the seating portion 4a (see FIGS. 1 and 3). The pair of bank portions 4b are convex portions on both sides of the seat cushion 4, and can support the side of the occupant during cornering of the vehicle.
In this embodiment, the seat pad 4P is covered with the seat cover 4S while being disposed on the seat frame 4F. At this time, the seat pad 4P is movable (relatively movable with respect to the seat frame 4F) to support the posture displacement of the occupant. In this type of seat configuration, it is desirable that the seat pad 4P be movable with good performance (for example, with good supportability) to promote blood flow by changing the sitting pressure and reduce fatigue, pain, and the like.
Therefore, in this embodiment, in order to displace the posture of the occupant, the seat pad 4P is made movable with high performance with the configuration described later. Hereinafter, each configuration will be described in detail.

[Seat frame]
The seat frame 4F is a substantially rectangular (upward view) frame, and includes a front frame 12, a pair of side frames 14, a rear frame 16, a locking portion 17, and a cushion pan 18 described later ( 2 to 4).
The front frame 12 is a substantially inverted L-shaped (sectional view) flat plate member and constitutes a front skeleton of the seat cushion 4. The pair of side frames 14 is a flat plate member that constitutes a side skeleton of the seat cushion 4, and is disposed facing each other on the side of the seat. The rear frame 16 is a bar (cylindrical shape) that reinforces the rear portion of the seat frame 4F, and can be disposed between the pair of side frames 14 in a bridging manner.
The locking portion 17 is a substantially inverted U-shaped bar and can be attached to the rear frame 16. In this embodiment, the locking portion 17 protrudes above the seat while the free end side of the locking portion 17 is attached to the center of the rear frame 16.

The cushion pan 18 is a flat plate material that supports a seat pad 4P (described later), and can be disposed in the seat frame 4F (between the front frame 12 and the rear frame 16).
The cushion pan 18 of the present embodiment has a substantially inverted trapezoidal shape (sectional view) with a flat center, and includes a first inclined surface 18a, a second inclined surface 18b, and a plurality of screw holes H.
The first inclined surface 18a is an inclined surface that is gradually inclined downward from the front frame 12 toward the rear of the seat. The second inclined surface 18b is an inclined surface that is gradually inclined downward from the rear frame 16 toward the front of the seat.
Each of the plurality of screw holes H is a hole in the center of the cushion pan 18 and is arranged in a substantially rectangular shape (along the periphery of a later-described arrangement hole 32) at an appropriate interval (in FIG. Only the screw holes are marked).

[Seat pad (fixed part / movable part)]
The seat pad 4P is a member that can elastically support an occupant and includes a fixed portion 30 and a movable portion 34 (see FIGS. 2 and 3).
Here, the material of the seat pad 4P is not particularly limited, but can be formed of a foamed resin such as polyurethane foam.
And the fixing | fixed site | part 30 is a substantially rectangular member (relatively large), and comprises the external shape (a pair of bank part 4b, the front-and-back part of the seating part 4a) of the seat cushion 4 (refer FIG. 2). The fixing portion 30 is provided with an arrangement hole 32 that penetrates the fixing portion 30 in the thickness direction. In the present embodiment, a substantially rectangular arrangement hole 32 (a dimension W1 in the seat width direction) is provided substantially at the center of the fixed portion 30 (a position corresponding to the center of the seating portion 4a) and is disposed facing the center of the cushion pan 18.
The movable portion 34 is a substantially rectangular member (relatively small) and constitutes the central shape of the seating portion 4a. Then, the outer dimension of the movable portion 34 is set to be slightly smaller than the outer dimension of the arrangement hole 32 so as to be relatively movable in the arrangement hole 32. For example, in this embodiment, by setting the dimension W2 of the movable part 34 in the sheet width direction to be smaller than the dimension W1 of the arrangement hole 32, the movable part 34 can be relatively moved in the arrangement hole 32 in the sheet width direction. To do.

[Seat Cover]
The seat cover 4S is a bag-like member that can cover the seat pad 4P, and includes a first cover 21 and a second cover 22 (see FIGS. 2 and 3).
Here, the material of the seat cover 4S is not particularly limited, but a natural fiber or synthetic fiber fabric (woven fabric, knitted fabric, non-woven fabric), leather (natural leather, synthetic leather), a net material composed of the above fibers, and a composite material thereof. It can be illustrated.
The first cover 21 is a bag-like member that covers the fixed portion 30, and a recessed portion 23 is formed in the center of the cover. The concave portion 23 is a concave portion shaped like the arrangement hole 32 and can be arranged along the inner surface of the arrangement hole 32 to cover the bottom surface side thereof. A plurality of screw holes H are provided on the bottom surface side of the recessed portion 23 and can respectively face the screw holes H on the cushion pan 18 side. Attached). The peripheral edge (SE) of the first cover 21 can be locked to the seat frame 4F via a locking member (not shown).
The second cover 22 is a bag-like member that covers the movable portion 34, and includes an opening 24 on the rear side of the seat, a lid portion 26 that can open and close the opening 24, and a restriction mechanism CM (described later).

[Magnetic mechanism]
The magnetic mechanism MM is a mechanism that enables the movable portion 34 to move relative to the seat frame 4F, and includes a first magnet portion 41 and a pair of second magnet portions 42 (see FIGS. 2 and 3).
The 1st magnet part 41 is a substantially rectangular (upward view) flat plate member, and can be attached to the movable part 34 side. The pair of second magnet portions 42 are rectangular flat plate members that are long in the front and rear of the seat, and can be attached to the seat frame 4F side. Here, the material of each magnet part is not particularly limited, but permanent magnets (KS steel, MK steel, alnico magnet, ferrite magnet, samarium cobalt magnet, neodymium magnet, etc.), electromagnet, and temporary magnet can be exemplified.

In the present embodiment, the first magnet portion 41 (permanent magnet) is attached to the bottom surface of the movable portion 34 via a flat support member 44 (made of resin) and is disposed facing the center of the cushion pan 18. In addition, the pair of second magnet portions 42 (permanent magnets) are extended toward the front and rear of the seat while being mounted in parallel to the center of the cushion pan 18 (position facing the first magnet portion 41).
At this time, by adjusting the direction of the magnetic poles of the first magnet part 41 and the second magnet part 42, a repulsive force (repulsive force of magnetic force) is generated between the mutually facing surfaces (opposing surfaces). For example, when the facing surface of the first magnet unit 41 is N-pole, the facing surface of the second magnet unit 42 is N-pole. Moreover, when the opposing surface of the 1st magnet part 41 is a south pole, let the opposing surface of the 2nd magnet part 42 be a south pole.

[Restriction mechanism]
The restriction mechanism CM is a mechanism that restricts relative movement of the movable portion 34 in the separation direction with respect to the seat frame 4F, and includes a first restriction member 51 and a second restriction member 52 (see FIGS. 2 to 4).
The first restricting member 51 is a flexible belt-like member (typically made of cloth) that can be wound, and has an insertion hole portion 51a and a stopper portion 51b (see FIG. 4). The insertion hole 51 a is a long hole (through hole) in the middle of the first restriction member 51 and has a dimension that allows the end of the first restriction member 51 to be inserted. The stopper 51b is a bar provided at the end of the first restricting member 51, and is longer than the dimension in the longitudinal direction of the insertion hole 51a.
In the present embodiment, the first restricting member 51 is attached to the rear end (the center of the lower edge of the opening 24) of the second cover 22 and can be extended toward the locking portion 17 side.

The second restricting member 52 is a rectangular flat plate member that is long in the front and back of the sheet, and is made of the same material as each magnet portion or a ferromagnetic material (metal such as iron, cobalt, nickel, gadolinium, or an alloy thereof). Can be formed (see FIG. 2).
In the present embodiment, the second restriction member 52 (permanent magnet) is disposed between the pair of second magnet portions 42 while being attached to the center of the cushion pan 18. At this time, by adjusting the orientation of the magnetic poles of the first magnet unit 41 and the second restricting member 52, a force (attraction force of magnetic force) that attracts between the mutually facing surfaces (opposing surfaces) is generated. For example, when the facing surface of the first magnet unit 41 is N-pole, the facing surface of the second restricting member 52 is the S-pole. Moreover, when the opposing surface of the 1st magnet part 41 is a south pole, let the opposing surface of the 2nd limitation member 52 be a north pole. In this embodiment, the magnetic force between the first magnet part 41 and the second restricting member 52 is made weaker than the magnetic force between the first magnet part 41 and each of the second magnet parts 42. It is configured to allow relative movement.

[Seat cushion assembly work]
2 to 4, the seat pad 4P is covered with the seat cover 4S while being disposed on the seat frame 4F.
In the present embodiment, the fixing portion 30 is covered with the first cover 21, and the bottom surface side of the arrangement hole 32 is covered with the recessed portion 23. Next, the first cover 21 (recessed portion 23) is fixed to the cushion pan 18 via the screw material B while the fixing portion 30 is disposed on the seat frame 4F (see FIG. 3). And the fixing | fixed site | part 30 can be fixed to the seat frame 4F by latching the periphery of the 1st cover 21 to the seat frame 4F suitably.

Further, after the movable portion 34 is inserted into the second cover 22, the opening 24 is covered with the lid portion 26. Then, the movable part 34 is arranged in the arrangement hole 32, and the bottom surface (first magnet part 41) of the movable part 34 is arranged facing the center of the cushion pan 18 (second magnet part 42). Thus, when the first magnet portion 41 and the second magnet portion 42 are arranged to face each other through the first cover 21, a repulsive force of magnetic force is generated between the seat frame 4F and the movable portion 34.
And after winding the 1st restricting member 51 around the latching | locking part 17 passing through the hole of the fixing | fixed part 30 which is not shown in figure, the edge part of the 1st restricting member 51 is inserted in the insertion hole 51a, and the stopper part 51b. (See FIG. 4). In this way, the movable part 34 can be arranged so as to be relatively movable in the arrangement hole 32 through the repulsive force of the magnetic force with respect to the seat frame 4F.

[Relative movement of seat pad]
Then, the seat pad 4P is moved relative to the seat frame 4F to displace the occupant's posture and support the posture (see FIGS. 2 to 4).
At this time, in the present embodiment, the movable portion 34 is disposed so as to be relatively movable on the seat frame 4F via the repulsive force of the magnetic force. For this reason, the movable part 34 can follow a passenger | crew's attitude | position displacement suitably, and can support a passenger | crew's attitude | position displacement suitably.
In this embodiment, the fixed portion 30 is fixed to the seat frame 4F and does not follow the relative movement of the movable portion 34. For this reason, for example, when the vehicle is traveling, excessive movement of the occupant can be restricted at the fixed portion 30 (the seat configuration is excellent in support performance).

Further, in the above-described configuration, there is a concern that the movable member may be detached from the arrangement hole 32 or become unstable due to the movable member moving away from the seat frame 4F at the time of a vehicle collision or normal traveling.
For example, there is a concern that the movable part 34 (rear part) may be lifted off from the arrangement hole 32 during a frontal collision of the vehicle. Therefore, in the present embodiment, the first restriction member 51 connects the rear portion of the movable portion 34 to the locking portion 17 so that the movable portion 34 can be prevented from dropping off from the seat frame 4F (FIGS. 2 and 2). 4).
Moreover, there is a concern that the movable portion 34 becomes unstable (eg, rattling) during normal traveling due to excessive repulsion of the first magnet portion 41 and the second magnet portion 42. Therefore, in the present embodiment, by suppressing excessive repulsion between the first magnet portion 41 and the second magnet portion 42 by the second restricting member 52, the movable portion 34 can be arranged in the arrangement hole 32 with a stable feeling. (See FIG. 3).

As described above, according to the present embodiment, while the support performance of the seat pad 4P is suitably maintained at the fixed portion 30, the movable portion 34 is relatively moved by the repulsive force of magnetic force (by a relatively simple means). It can be movable.
Further, according to the present embodiment, the restriction mechanism CM can appropriately prevent the relative movement of the movable portion 34 in the separating direction with respect to the seat frame 4F (configuration having excellent mounting stability).
And according to the arrangement position of the fixed part 30 and the movable part 34 of a present Example, a passenger | crew's pelvis can be rotated (rolled) centering on the lumbar spine vicinity, and thereby blood flow is promoted by the change of seat pressure. Reduces fatigue and pain.
Therefore, according to the present embodiment, by making the seat pad 4P movable with high performance, it is possible to promote blood flow by changing the seating pressure and reduce fatigue, pain, and the like.

<Example 2>
Since the vehicle seat of the present embodiment has substantially the same basic configuration as the vehicle seat 2 of the first embodiment, the common structure is denoted by the corresponding reference numerals and detailed description thereof is omitted.
In the present embodiment, the second restricting member 52 is attached to the front portion (first inclined surface 18a) of the cushion pan 18 while facing the seat width direction (see FIG. 5).
Further, the movable portion 34 and the support member 44 are slightly enlarged in the front-rear direction of the seat so that the front side can face the first inclined surface 18a. A suction member 54 that is magnetically attracted to the second restriction member 52 is disposed on the front side of the support member 44. Examples of the material of the suction member 54 include a permanent magnet, an electromagnet, a temporary magnet, and a ferromagnetic material.
The movable part 34 is arranged in the arrangement hole 32 (a slightly larger hole part following the movable part). At this time, by arranging the second restricting member 52 and the suction member 54 so as to face each other, the two members are brought into close contact with each other by a magnetic attractive force. For this reason, the movable portion 34 is gradually and relatively movable (swingable) in the seat width direction from the front portion (end portion side) of the seat cushion 4 toward the reclining mechanism RM with both the members 52 and 54 as the starting point. . At this time, the front surface of the support member 44 is formed in an arc shape (an arc convex toward the front side of the seat), and the second restricting member 52 and the suction member 54 are brought into point contact so that the movable portion 34 can smoothly swing.

By the way, in a typical sitting state, the occupant's buttocks are disposed on the reclining mechanism RM side, and the occupant legs are disposed on the front portion (end portion side) of the seat cushion 4.
Therefore, according to the configuration of the present embodiment, the occupant can smoothly swing the waist and the buttocks starting from the leg portion by swinging the movable portion 34 (the posture can be displaced with a stable feeling). Further, by restraining the relative movement of the occupant legs as much as possible, the pedal operation can be stabilized with little change in the base of the leg, and the configuration can be made so as not to hinder the occupant's operation control as much as possible.
As described above, in the present embodiment, the movable portion 34 can be relatively moved relatively large on the reclining mechanism RM side (a portion that easily contacts the occupant). Further, the movable portion 34 relatively moves relatively on the end side of the sheet constituent member (becomes excellent in supportability). The relative movement of the movable portion 34 in the separation direction with respect to the seat frame 4F can be limited by the magnetic attraction between the second restriction member 52 and the suction member 54.

The vehicle seat of the present embodiment is not limited to the above-described embodiment, and can take other various embodiments.
(1) In the present embodiment, the configuration (shape, dimension, arrangement position, number of arrangement, etc.) of the fixed portion 30 and the movable portion 34 is exemplified, but the configuration of the same portion is not intended to be limited. For example, in the present embodiment, the example in which the movable portion 34 forms the central shape of the seating portion 4a has been described. The movable part can constitute at least a part of the seating part, or can constitute the entire seating part. A plurality or a single movable part can also be provided. Further, the movable portion can be relatively movable in at least one direction of the seat width direction and the seat front-rear direction. And according to the structure of a movable part, the structure of a fixed part can be changed suitably.
Moreover, a movable part can also be provided in the position corresponding to a bank part.
(2) Moreover, in this embodiment, the example which forms the fixed site | part 30 and the movable site | part 34 as a different body was demonstrated. Unless the relative movement of the movable part is extremely limited, the movable part (preferably the front side) can be connected to the fixed part.

(3) In the present embodiment, the limiting mechanism CM including the first limiting member 51 and the second limiting member 52 has been exemplified, but the configuration of the limiting mechanism is not intended to be limited. For example, the limiting mechanism can have at least one of a first limiting member and a second limiting member. Further, the first restricting member can be provided on at least one of the front, rear, left and right of the movable member, and can be connected to the corresponding part of the seat frame. The first restricting member can take various shapes that can be locked or gripped by a part of the seat frame (such as a locking portion). In addition, the second restricting member can be appropriately provided in each part of the seat frame (for example, the inner surface of the side frame), and the configuration of the movable part (first magnet portion) can be appropriately changed according to this.

(4) In the present embodiment, the magnetic force of the second restricting member 52 is constant in the front-rear direction of the seat, but the magnetic force on the front side of the seat can be made stronger than that on the rear side of the seat. For example, the size of the second restricting member is increased on the front side of the seat, or one member having a strong magnetic force is disposed on the front side of the seat when the pair of second restricting members are disposed. By doing so, the movable portion can be relatively moved (swinged) gradually in the seat width direction from the front portion (end portion side) of the seat cushion toward the reclining mechanism side.

(5) Moreover, in Example 2, although the structure of the 2nd restriction member 52 and the suction member 54 was illustrated, it is not the meaning which limits the structure of these members. For example, the second restricting member and the attracting member only need to be magnetically attractable to each other, and the second restricting member can be a ferromagnetic material and the attracting member can be a magnet. Further, the attraction member can be constituted by a part of the first magnet portion.
(6) In the present embodiment, the seat cushion 4 has been described as an example, but the configuration of the present embodiment can be applied to various seat components such as a seat back. The configuration of the present embodiment can be applied to all vehicle seats such as vehicles, airplanes, and trains.

2 Vehicle seat 4 Seat cushion 6 Seat back 8 Headrest 4S Seat cover 4P Seat pad 4F Seat frame 4a Seating portion 4b Bank portion 18 Cushion pan 21 First cover 22 Second cover 30 Fixed portion 32 Arrangement hole 34 Movable portion 41 First Magnet part 42 Second magnet part 44 Support member 51 First restriction member 52 Second restriction member CM Restriction mechanism MM Magnetic mechanism RM Reclining mechanism

Claims (3)

In a vehicle seat comprising a seat constituent member such as a seat cushion and a seat back, wherein the seat constituent member includes a seat frame that forms a seat skeleton, and a seat pad that forms a seat outer shape and can elastically support an occupant. ,
The seat pad has a movable part that can contact the occupant in a sitting state, and a fixed part that is arranged around the movable part,
When disposing the seat pad on the seat frame, the movable portion is disposed so as to be relatively movable with respect to the seat frame via a repulsive force of magnetic force, and the fixing portion is fixed to the seat frame. Vehicle seats that are configured to do this.   The vehicle seat according to claim 1, further comprising a limiting mechanism that limits relative movement of the movable part in the separation direction with respect to the seat frame. The seat back is configured to be connected to the seat cushion via a reclining mechanism so that the seat back can be raised and lowered.
The vehicle seat according to claim 1 or 2, wherein the movable portion is configured to be relatively relatively movable in a seat width direction as it goes from an end side of the seat constituent member to the reclining mechanism side.

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