Vehicle seat

Abstract

To provide a vehicle seat which achieves use of a seat frame in various seats and enables unification of seat surface positions of seating persons.SOLUTION: A vehicle seat includes a tilt device capable of adjusting a height position of a part of a cushion frame. The vehicle seat includes: side frames 11 disposed at left and right sides in a seat width direction; a pan frame 12 spanned between the left and right side frames 11; and tilt brackets 20, each of which is disposed between connected portions of the side frame 11 and the pan frame 12 and supports the pan frame 12. A housing recess part 113 for housing the tilt bracket 20 is formed on a support surface for supporting the pan frame 12 of the connected portion of the side frame 11.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat provided with a tilt device that is capable of adjusting the height position of a portion of a cushion frame that forms the framework of the seating portion. [Background technology]

[0002] 2. Description of the Related Art Vehicle seats are known that are equipped with a tilt device that can adjust the height position of a plate-shaped pan frame that constitutes a front portion of a cushion frame. Various techniques have been proposed for ensuring the assembly rigidity of the tilt device and for smoothly adjusting the height position of the pan frame using the tilt device (see, for example, Patent Documents 1 and 2).

[0003] In the vehicle seat with a tilt device described in Patent Document 1, the cushion frame comprises lower frames arranged on the left and right sides and a cushion pan frame that is spanned across the front portions of the left and right lower frames, and further comprises a tilt bracket that is rotatably attached to the lower frames and can raise and lower the cushion pan frame by rotating up and down. In order to improve the bending rigidity of the tilt bracket, the shape of the tilt bracket is devised.

[0004] The vehicle seat with a tilt device described in Patent Document 2 also has a similar configuration, and takes into consideration the seating position of the occupant when determining the position of the rotation center axis of the tilt bracket. This is intended to facilitate smooth adjustment of the pan frame height using the tilt device. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-129280 A [Patent Document 2] JP 2009-195597 A Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, in a vehicle seat with a tilt device as disclosed in Patent Documents 1 and 2, if it were possible to share the frame with a vehicle seat that does not have a tilt device, this would lead to cost reduction and more efficient assembly work. Furthermore, in aiming to standardize the frame, if the seating position of the occupant can be unified regardless of whether or not a tilt device is installed, it will be possible to achieve standardization of all seat parts, and the occupant will also enjoy a good seating comfort. Therefore, there has been a demand for a vehicle seat, in particular a vehicle seat with a tilt device, that allows the seat frame to be shared regardless of the specifications or type of vehicle seat.

[0007] Furthermore, in vehicle seats with tilt devices such as those described in Patent Documents 1 and 2, there has been a demand for further improving the mounting rigidity of the tilt device while also achieving a compact arrangement by devising an assembly position for the tilt device.

[0008] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a vehicle seat that enables the seat frame to be shared regardless of the specifications or type of vehicle seat. Another object of the present invention is to provide a vehicle seat that allows the seating position of the seat occupant to be unified regardless of whether or not a tilt device is provided, in order to allow common use of the seat frame. Another object of the present invention is to provide a vehicle seat in which the mounting rigidity of a tilt device is improved and a compact arrangement of the tilt device is realized. [Means for solving the problem]

[0009] The above problem is solved by the vehicle seat of the present invention, which comprises a cushion frame that forms the skeleton of the seating area, the cushion frame being arranged on the left and right sides in the width direction of the seat and having side frames extending in the fore-aft direction of the seat, and a plate-shaped pan frame that is spanned between the left and right side frames, a support bracket for supporting the pan frame is interposed between the connecting parts of the side frames and the pan frame, and a storage recess for storing the support bracket is formed at a predetermined position on the support surface of the side frame that supports the pan frame at the connecting part. As described above, a storage recess for storing the support bracket is formed at a predetermined position on the support surface of the side frame for supporting the pan frame, so that even if the support bracket needs to be removed depending on the specifications and type of vehicle seat, the frame can be shared without changing the assembly position of the entire seat frame. In addition, the seat position of the seated person can be unified regardless of the presence or absence of the support bracket. Furthermore, by forming a recessed shape at a predetermined position in the connecting portion of the side frame, it is expected that the rigidity of the side frame will be improved.

[0010] In this case, the support bracket may be a tilt bracket that is rotatably attached to the side frame and rotates up and down to raise and lower the pan frame. With the above configuration, it is possible to realize a vehicle seat that allows the seat occupant to have a uniform seating position regardless of the presence or absence of a tilt bracket (tilt device). Furthermore, by storing the tilt bracket in the storage recess, a compact arrangement of the tilt bracket (tilt device) can be achieved.

[0011] In this case, the storage recess is preferably formed on the upper surface of the side frame which becomes the support surface, and the end portion of the pan frame in the seat width direction is positioned in a position where it can abut against the support surface and the upper surface of the support bracket stored in the storage recess in the vertical direction. With the above configuration, the pan frame is supported in the vertical direction by both the side frames and the support brackets, thereby improving the assembly rigidity of the pan frame.

[0012] In this case, it is preferable that a plurality of the storage recesses are formed at predetermined intervals in the front-rear direction of the seat and are arranged alternately with the support surfaces. With the above-described configuration, even when the support brackets are removed in accordance with the specifications of the vehicle seat, the pan frame is supported in a well-balanced manner by the side frames. In addition, since a plurality of storage recesses are formed at intervals, the support bracket can be stored in each storage recess and assembled, thereby increasing the assembly rigidity of the support bracket.

[0013] In this case, the support bracket has an upper wall portion that is placed on the upper surface of the side frame, and a side wall portion that bends downward from the end portion of the upper wall portion in the seat width direction and extends opposite to the side surface of the side frame, and the rear portion of the side wall portion is attached to the side surface of the side frame via a rotating shaft. With the above-described configuration, since the support bracket has a shape that fits along the side frame, the assembly rigidity of the support bracket to the side frame can be increased.

[0014] In this case, it is preferable that the storage recess has a first storage recess formed on the upper surface of the side frame for storing the upper wall portion, and a second storage recess adjacent to the first storage recess, formed on a side surface of the side frame, for storing the side wall portion. With the above-described configuration, by storing the support bracket in the first and second storage recesses, the support bracket can be arranged compactly in the up-down direction and the seat width direction.

[0015] In this case, it is preferable that the portion of the side wall portion that is attached to the side frame via the rotation shaft is positioned at a position different from the portion of the side frame in which the storage recess is formed in the fore-and-aft direction of the seat. With the above-described configuration, it is easier to ensure an area on the side surface of the side frame for mounting the support bracket, thereby increasing the assembly rigidity of the support bracket.

[0016] In this case, it is preferable that the side wall portion extends while facing an outer surface of the side frame in the seat width direction. With the above configuration, when a seating load is applied to the pan frame, the support bracket and the side frame can stably support the pan frame.

[0017] In this case, the support bracket is a tilt bracket and is equipped with a tilt device capable of raising and lowering the pan frame by rotating the tilt bracket in an up and down direction relative to the side frame, and the tilt device has a drive unit arranged inside the side frame in the seat width direction, and a drive link interposed between the drive unit and the tilt bracket and driving to rotate the tilt bracket in an up and down direction, and it is preferable that one end of the drive link is attached to the drive unit and the other end protrudes outward through a through hole formed in the side surface of the side frame and is attached to the side wall portion of the tilt bracket. As described above, the drive unit, which is the main body of the tilt device, is disposed between the left and right side frames without protruding outward in the seat width direction, so that the tilt device can be disposed compactly.

[0018] In this case, it is preferable that a portion of the side frame in which the through hole is formed is disposed at a position different from a portion in which the storage recess is formed in the seat front-rear direction. By adjusting the position of the through hole as described above, it is possible to suppress a decrease in rigidity of the side frame around the storage recess.

[0019] In this case, an opening hole penetrating in the vertical direction is formed at a predetermined position of the connecting portion of the pan frame, and the portion in which the opening hole is formed is preferably positioned at a position different from the portion of the support surface of the side frame in the fore-and-aft direction of the seat in which the storage recess is formed. With the above configuration, for example, when the support bracket (tilt bracket) is not required depending on the specifications, the pan frame and the side frame can be easily joined by adhesive or welding using the opening holes in the pan frame. Furthermore, even if a tilt bracket is attached to the frame, the tilt bracket can stably raise and lower the pan frame. Effect of the Invention

[0020] According to the invention of claim 1, even if the support bracket is removed depending on the specifications and type of the vehicle seat, the frame can be shared without changing the assembly position of the entire seat frame. In addition, the seat position of the seated person can be unified regardless of the presence or absence of the support bracket. In addition, the rigidity of the side frame can be improved. According to the invention of claim 2, the seat position of the seated person can be unified regardless of the presence or absence of a tilt bracket (tilt device). Also, the tilt device can be arranged compactly. According to the invention of claim 3, the assembly rigidity of the pan frame is improved.

[0021] According to the inventions of claims 4 and 5, even when the support brackets are removed depending on the specifications of the vehicle seat, the pan frame is supported by the side frames in a well-balanced manner. Also, the assembly rigidity of the support brackets can be increased. According to the invention of claim 6, the support bracket can be arranged compactly in the vertical direction and the seat width direction. According to the invention of claim 7, the assembly rigidity of the support bracket can be increased.

[0022] According to the invention of claim 8, the support bracket and the side frame can stably support the pan frame. According to the invention of claim 9, the tilt device can be arranged compactly. According to the invention of claim 10, it is possible to suppress a decrease in rigidity around the storage recess of the side frame. According to the invention of claim 11, when the tilt bracket is not required according to the specifications, the opening of the pan frame can be used to easily join the pan frame and the side frame with adhesive, etc. Even if the tilt bracket is included in the specifications, the tilt bracket can stably raise and lower the pan frame. [Brief description of the drawings]

[0023] [Figure 1] 1 is a perspective view of a vehicle seat according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a perspective view of a seat frame that serves as a framework of the vehicle seat. [Diagram 3] FIG. 13 is a perspective view of the seat frame, showing a raised position in which the pan frame has moved upward relative to the side frames. [Figure 4] FIG. 3 is an enlarged view of a main portion of FIG. 2, showing a perspective view of a connecting portion between a pan frame and a side frame. [Diagram 5] 1 is an exploded perspective view showing a connecting portion between a pan frame and a side frame. FIG. [Figure 6] 6 is a cross-sectional view taken along line VI-VI in FIG. 3, illustrating the details of the tilt device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, a vehicle seat according to an embodiment of the present invention will be described with reference to FIGS. This embodiment relates to an invention for a vehicle seat equipped with a tilt device that can adjust the height position of a portion of a cushion frame, and which comprises side frames arranged on the left and right sides in the width direction of the seat, a pan frame that is spanned between the left and right side frames, and a tilt bracket that is interposed between the connecting portions of the side frames and the pan frame and supports the pan frame, and which is characterized in that a storage recess for storing the tilt bracket is formed on the support surface of the connecting portion of the side frame that supports the pan frame. In addition, the side of the seat back of the vehicle seat on which an occupant sits is the front side of the seat.

[0025] The vehicle seat S of this embodiment is mainly composed of a seat body having a seat cushion 1 and a seat back 2, as shown in FIG. 1, a reclining device 3 that rotatably connects the seat back 2 to the seat cushion 1, as shown in FIG. 2, a height link device 4 that connects the seat body so that it can be raised and lowered, and a tilt device 30 that can adjust the height position of the front part of the seat cushion 1, as shown in FIG. 3.

[0026] As shown in FIG. 1, the seat cushion 1 is a seating portion that supports an occupant from below, and is configured by placing a cushion material 1a on a cushion frame 10 shown in FIG. 2, which serves as a skeleton, and covering it with a skin material 1b. The seat back 2 is a backrest portion that supports the back of an occupant from behind, and is configured by placing a cushion pad 2a on a back frame that serves as a skeleton, and covering the cushion pad 2a with a skin material 2b.

[0027] As shown in FIG. 2, the cushion frame 10 is a substantially rectangular frame-like body and is mainly composed of side frames 11 arranged on the left and right sides, a pan frame 12 that is suspended between the front portions of the left and right side frames 11, a pipe-shaped rear frame 13 that connects the rear portions of the left and right side frames 11, and a number of elastic springs 14 that are suspended between the pan frame 12 and the rear frame 13 and extend in a snake-like shape.

[0028] The side frame 11 is made of a sheet metal member having a generally I-shaped vertical cross section, extends in the front-rear direction of the seat, and has a pan frame 12 attached to its front portion. The pan frame 12 is a frame that supports the thighs of a seated occupant and is made of a roughly rectangular plate body. The left and right end portions 12a in the seat width direction are placed on and attached to the upper surfaces of the side frames 11. As shown in Figs. 3 and 4, a tilt bracket 20 for supporting the pan frame 12 is attached between the connecting portion of the side frame 11 and the pan frame 12. As shown in FIG. 3, a tilt device 30 capable of adjusting the height position of the pan frame 12 is provided between the left and right side frames 11 in the seat width direction.

[0029] As shown in Figures 4 and 5, the side frame 11 is mainly composed of a frame main body 110, an upper end flange 111 that bends and protrudes inward in the seat width direction from the upper end portion of the frame main body 110, and a lower end flange 112 that bends and protrudes inward in the seat width direction from the lower end portion of the frame main body 110. As shown in FIG. 5, a storage recess 113 for storing the tilt bracket 20 is formed in the connecting portion of the side frame 11 with the pan frame 12. The storage recess 113 is formed on the upper end flange 111 of the side frame 11, which serves as the support surface for the pan frame 12, and is equipped with a first storage recess 113a for storing a part of the tilt bracket 20, and a second storage recess 113b formed on the side of the frame main body 110 for storing a part of the tilt bracket 20. A plurality of first storage recesses 113a are formed at predetermined intervals in the front-rear direction of the seat and are arranged alternately with the convex portions of the upper end flange 111. The first storage recesses 113a and the second storage recesses 113b are arranged adjacent to each other.

[0030] As shown in Figures 4 and 5, the tilt bracket 20 is a roughly L-shaped plate body that is rotatably attached to the side of the side frame 11 and is a support bracket for raising and lowering the pan frame 12 by rotating and moving in the vertical direction. As shown in FIG. 5, the tilt bracket 20 includes an upper wall portion 21 that is placed on the upper surface of the upper end flange 111 of the side frame 11, and a side wall portion 22 that bends downward from the outer end of the upper wall portion 21 and extends opposite the outer surface of the main frame 1110.

[0031] The upper wall portion 21 is a generally rectangular plate portion, and a plurality of upper wall portions 21 are formed at predetermined intervals in the seat front-rear direction. The upper surface of the upper wall portion 21 and the upper surface of the upper end flange 111 are disposed so as to be substantially flush with each other, and are formed as support surfaces that can come into contact with the left and right end portions 12a of the pan frame 12, respectively. The upper surface of the upper wall portion 21 and the left and right end portions 12a of the pan frame 12 are joined by laser welding.

[0032] As shown in FIGS. 4 and 5, the side wall portion 22 is a plate portion that is long in the front-rear direction of the seat, and is stored in a second storage recess 113b formed in the frame main body 110. The rear portion of the side wall portion 22 is attached to the outer surface of the frame body 110 via a rotating shaft 23, and the front portion of the side wall portion 22 is attached to a drive link 36 (described later) via a connecting pin 24. The portion of the side wall 22 to which the connecting pin 24 (drive link 36) is attached is offset so as to protrude outward in the seat width direction. This allows a space to be formed between the side frame 11 and the tilt bracket 20, allowing other components to be compactly arranged in this space. In addition, the rigidity of this portion of the side wall 22 can be increased.

[0033] The tilt device 30 is a device that can adjust the height position of the pan frame 12 between a normal position shown in FIG. 2 and a raised position shown in FIG. In detail, as shown in FIG. 3, the tilt device 30 is a device capable of raising and lowering the pan frame 12 by rotating the tilt bracket 20 in the vertical direction relative to the side frame 11, and is attached to the inner surface of the side frame 11 in the seat width direction.

[0034] As shown in FIG. 6, the tilt device 30 is mainly composed of a drive unit 31 which is the main body of the tilt device 30, a pinion gear 32 which is rotatably attached to the drive unit 31, a sector gear 34 whose tip meshes with the pinion gear 32 as a gear and whose end is attached to the inner surface of the side frame 11 via a rotating shaft 33, and a drive link 36 whose one end is attached to the outer surface of the sector gear 34 via a rotating pin 35 and whose other end passes through a through hole 114 formed in the side of the side frame 11, bending and protruding outward, and which is attached to the side wall portion 22 of the tilt bracket 20.

[0035] The operation of the tilt device 30 to move the pan frame 12 from the normal position shown in FIG. 2 to the raised position shown in FIG. 3 will be described with reference to FIG. In the tilt device 30, first, the pinion gear 32 rotates about an axis along the seat width direction in accordance with the driving operation of the drive unit 31. In accordance with the rotational operation of the pinion gear 32, the sector gear 34 rotates upward about the rotary shaft 33. As the sector gear 34 rotates upward, the bent drive link 36 connected to the sector gear 34 via a rotation pin 35 moves upward. As the drive link 36 moves upward, the tilt bracket 20 connected to the drive link 36 via a connection pin 24 rotates upward around the rotation shaft 23. As a result, the pan frame 12 together with the tilt bracket 20 can be rotated and moved from the normal position to the raised position.

[0036] In the above configuration, as shown in FIG. 5, the left and right end portions 12a of the pan frame 12 are formed with a first convex bead 12b extending in the front-to-rear direction of the seat along the tilt bracket 20, and a second convex bead 12c extending in a direction perpendicular to the first convex bead 12b (seat width direction) and positioned corresponding to each upper wall portion 21 of the tilt bracket 20. Therefore, the first convex bead 12b can ensure frame rigidity at the connecting portion of the pan frame 12 with the side frame 11 and at the connecting portion with the tilt bracket 20. In addition, each of the second convex beads 12c can further ensure frame rigidity at the connection portion of the pan frame 12 with the tilt bracket 20 (upper wall portion 21).

[0037] In the above configuration, as shown in FIG. 5, in the left and right end portions 12a of the pan frame 12, avoiding the convex beads 12b, 12c, three opening holes 12d are provided at predetermined intervals along the side frame 11 and penetrate in the vertical direction. The portion where the opening hole is formed is disposed in a position on the upper surface (support surface) of the side frame 11 in the seat front-rear direction, avoiding the portion where the first storage recess is formed. Therefore, when the tilt bracket 20 is not required for the specifications of the vehicle seat, the pan frame 12 and the side frame 11 can be easily joined with an adhesive or the like by utilizing the openings in the pan frame 12. Even when the specifications require the tilt bracket 20 to be attached, the tilt bracket 20 can stably support the pan frame 12.

[0038] In the above configuration, as shown in FIG. 5, the portion of the side frame 11 where the through hole 114 is formed is disposed at a position that avoids the portion where the first storage recess is formed in the seat front-rear direction. Therefore, the frame rigidity of the side frame 11 around the first storage recess, which is the portion on which the upper wall portion 21 of the tilt bracket 20 is placed, can be ensured.

[0039] In the above configuration, as shown in FIG. 5, the portion of the side wall portion 22 of the tilt bracket 20 that is attached to the side frame 11 via the rotation shaft 23 is positioned in a position that avoids the portion of the side frame 11 where the first storage recess is formed in the fore-and-aft direction of the seat. Therefore, it becomes easier to ensure the area of ​​the side surface of the side frame 11 for mounting the tilt bracket 20, and the frame rigidity of the tilt bracket 20 can be ensured.

[0040] <Other embodiments> In the above embodiment, as shown in FIG. 3, the vehicle seat S is a seat equipped with a tilt device 30, and a tilt bracket 20 is attached between the connecting portion of the side frame 11 and the pan frame 12, but this can be modified without any particular limitation. For example, the seat may not be equipped with the tilt device 30, and a support bracket may be attached between the connecting portions to simply reinforce and support the pan frame 12.

[0041] In the above embodiment, as shown in FIG. 5, the left and right end portions 12a of the pan frame 12 are supported and connected to the upper surface of the side frame 11 and the upper surface of the tilt bracket 20, but this can be modified without any particular limitation. For example, the left and right end portions 12a of the pan frame 12 may extend to the outer surfaces of the side frames 11 and be supported and connected to the outer surfaces of the side frames 11 and the outer surfaces of the tilt brackets 20.

[0042] In the above embodiment, a vehicle seat used in an automobile was described as a specific example, but the present invention is not limited to this and can be used as a vehicle seat for trains, buses, etc., as well as a vehicle seat for airplanes, ships, etc.

[0043] In the present embodiment, the vehicle seat according to the present invention has been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0044] S Vehicle seat 1 seat cushion 1a,2a Cushion pad 1b,2b Skin material 2 Seat back 3 Reclining device 4 Height link device 10 Cushion Frame 11 Side frame 12 Pan Frame 12a Left and right ends 12b First convex bead 12c Second convex bead 12d opening hole 13 Rear frame 14 Elastic Spring 20 Tilt bracket 21 Upper wall 22 Side wall 23 Rotation axis 24 Connecting pin 30 Tilt device 31 Drive unit 32 Pinion gear 33 Rotating shaft 34 Sector Gear 35 Pivot pin 36 Drive link 110 Frame body 111 Upper flange 112 Lower flange 113 Storage recess 113a First storage recess 113b Second storage recess 114 Through hole

Claims

1. It is equipped with a cushion frame that forms the framework of the seating area. The cushion frame includes side frames disposed on the left and right sides in the seat width direction and extending in the seat front-rear direction, and a plate-shaped pan frame that is bridged between the left and right side frames. A support bracket for supporting the pan frame is interposed between the connecting portion between the side frame and the pan frame, A vehicle seat characterized in that a storage recess for storing the support bracket is formed at a predetermined position on the support surface of the side frame for supporting the pan frame at the connecting portion.

2. 2. The vehicle seat according to claim 1, wherein the support bracket is a tilt bracket that is rotatably attached to the side frame and rotates and moves in an up-down direction to raise and lower the pan frame.

3. The storage recess is formed on an upper surface of the side frame that serves as the support surface, A vehicle seat as described in claim 1 or 2, characterized in that an end portion of the pan frame in the seat width direction is positioned in a position where it can abut against the support surface and the upper surface of the support bracket stored in the storage recess in the vertical direction.

4. The vehicle seat according to claim 3, wherein a plurality of the storage recesses are formed at predetermined intervals in the front-rear direction of the seat and are arranged alternately with the support surfaces.

5. the support bracket has an upper wall portion placed on an upper surface of the side frame, and a side wall portion bent downward from an end portion of the upper wall portion in a seat width direction and extending while facing a side surface of the side frame, 5. The vehicle seat according to claim 3, wherein a rear portion of the side wall is attached to a side surface of the side frame via a rotation shaft.

6. 6. The vehicle seat according to claim 5, wherein the storage recess includes a first storage recess formed in an upper surface of the side frame for storing the upper wall portion, and a second storage recess adjacent to the first storage recess formed in a side surface of the side frame for storing the side wall portion.

7. The vehicle seat according to claim 5 or 6, characterized in that a portion of the side wall portion that is attached to the side frame via the rotation shaft is positioned at a different position in the seat front-rear direction from a portion of the side frame in which the storage recess is formed.

8. 8. The vehicle seat according to claim 5, wherein the side wall portion extends in a seat width direction while facing an outer surface of the side frame.

9. The support bracket is a tilt bracket, A tilt device is provided that can raise and lower the pan frame by rotating and moving the tilt bracket in a vertical direction relative to the side frame, The tilt device is A drive unit disposed inside the side frame in the seat width direction; a drive link interposed between the drive unit and the tilt bracket and configured to drive the tilt bracket to rotate in the up-down direction; The vehicle seat according to claim 8, characterized in that one end of the drive link is attached to the drive unit, and the other end passes through a through hole formed in a side surface of the side frame to protrude outward and is attached to the side wall portion of the tilt bracket.

10. The vehicle seat according to claim 9, wherein a portion of the side frame in which the through hole is formed is disposed at a position different from a portion in which the storage recess is formed in the seat front-rear direction.

11. An opening hole penetrating in the vertical direction is formed at a predetermined position of the connecting portion of the pan frame, The vehicle seat according to any one of claims 1 to 10, characterized in that the portion in which the opening hole is formed is located at a position on the support surface of the side frame in the seat fore-and-aft direction that is different from a portion in which the storage recess is formed.

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