JP3177316U - Seat cushion - Google Patents

Abstract

To provide a cushion for a seat that can be easily attached to and detached from a seat and can be arranged so that a backrest cover portion follows the backrest portion.
A seat cushion includes a backrest cover portion disposed on a front surface side of a backrest portion of the vehicle seat, and an attachment member for attaching the backrest cover portion to the seat so that the backrest portion is along the backrest portion. 14. The attachment member 14 extends from the base side of the connection support plate 15 to which the backrest cover portion 9 is attached and is inserted between the seat portion 3 and the backrest portion 4, and the seat portion 3 and the backrest portion 4. And a retaining piece 16 that is prevented from coming off from between. The backrest cover portion 9 includes a pocket-shaped insertion recess into which the connection support plate 15 can be inserted. The connection support plate 15 and the retaining piece 16 are urged so that the leading ends approach each other, and the lower end of the backrest 4 is clamped in the front-rear direction when attached to the seat 1.
[Selection] Figure 2

Description

  The present invention relates to a seat cushion having a backrest cover portion disposed at least on the front side of a backrest portion in a vehicle seat and attached to the vehicle seat.

  Conventionally, as a seat cushion having a back cover portion disposed on the front side of the back portion of the vehicle seat, there is a configuration in which the back cover portion is disposed so as to cover the front side on the lower side of the back portion. It was. In this seat cushion, the backrest cover portion is attached to the backrest portion by connecting the string-like connecting members extending vertically from the upper and lower end sides of the backrest portion to the upper and lower end sides of the backrest portion (for example, Patent Document 1).

JP 2001-353041 A

  However, in the conventional seat cushion, it is necessary to fix the backrest cover portion to the backrest portion by connecting the string-like connecting members extending vertically from the upper and lower end sides of the backrest portion to the upper and lower ends of the backrest portion, respectively. Therefore, the work for attaching to and detaching from the sheet is complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a seat cushion that can be easily attached to and detached from a seat and that can be disposed so that a backrest cover portion follows the backrest portion.

The seat cushion according to the present invention is a seat cushion that has a backrest cover portion disposed at least on the front side of the backrest portion of the vehicle seat and is attached to the vehicle seat,
A back cover part disposed on the front side of the back part, and a mounting member attached to the seat so that the back cover part is along the back part,
The mounting member is formed by bending a flexible plate material made of synthetic resin,
A substantially rectangular plate-like connection support plate for attaching and supporting the back cover portion;
It is formed so as to extend from the base part side of the connection support plate, and is arranged between the seat part and the backrest part of the seat, with the slippage between the seat part and the backrest part after being inserted backward being suppressed. A retaining piece to be
With
The back cover part is configured with a lower opening on the rear surface side, and has a pocket-shaped insertion recess into which the connection support plate can be inserted from below, the connection support plate and the retaining piece part mutually facing the tip side The lower end of the backrest portion can be clamped in the front-rear direction when attached to the seat.

  In the seat cushion of the present invention, when the retaining piece is attached to the seat so as to be inserted between the seat portion and the backrest portion of the seat, the connecting support plate is inserted into the insertion recess of the backrest cover portion. Then, the retaining piece is biased so that the distal ends approach each other, and the lower end of the backrest is sandwiched in the front-rear direction. That is, in the backrest cushion of the present invention, the connecting support plate to which the backrest cover portion is attached is always directed so that the tip (upper end) is directed backward (the tip end side of the retaining piece portion) when attached to the seat. Since the mode is such that it is biased, the upper end side of the backrest cover portion is pressed against the backrest portion, so that the backrest cover portion can be made to stand on its own and along the backrest portion. As a result, in the seat cushion of the present invention, by simply inserting the retaining piece portion of the mounting member between the seat portion and the backrest portion, the backrest cover portion is restrained from being tilted forward and is self-supporting. It can be attached to the seat so as to be along the backrest, and attachment work to the seat is easy. Of course, if the retaining piece is moved so as to be strongly pulled out from between the seat and the backrest, it can be removed from the seat, and the removal work is easy.

  Therefore, the seat cushion of the present invention can be easily attached to and detached from the seat, and can be disposed so that the backrest cover portion is along the backrest portion.

Further, in the seat cushion of the present invention, the connection part for connecting the connection support plate and the retaining piece part is divided into a plurality of parts on the left-right direction side,
An outer connecting portion disposed on the outer side in the vertical direction;
An inner connecting portion that is arranged inward in the vertical direction side relative to the outer connecting portion, and that is capable of exerting a biasing force when attached to the seat, and whose length dimension is set smaller than the outer connecting portion,
It is preferable to set it as the structure provided with.

  If the seat cushion has the above-described configuration, the urging force that acts to bring the tips of the connection support plate and the retaining piece portion closer to each other can be further increased by arranging the inner connection portion. The connection support plate and the retaining piece are difficult to open so as to separate the tips from each other, and the backrest cover part can be reliably aligned with the backrest part while preventing forward tilting when attached to the seat. .

  In the seat cushion having the above-described configuration, if the inner connecting portion is formed of a rubber-like elastic body that exerts an urging force, the connecting support plate and the retaining piece portion are always brought close to each other by the inner connecting portion. Thus, the backrest cover portion can be surely aligned with the backrest portion while suppressing forward tilting when attached to the seat.

  Further, in the seat cushion having the above-described configuration, if the connection support plate is configured so that the unevenness is continuously arranged on the left and right side edges, the friction resistance of the connection support plate with respect to the insertion recess of the backrest cover portion is increased. It is possible to stop the vertical position of the back cover part by the frictional force generated between the inner surface of the recess for insertion and the connection support plate, and the height position of the back cover part relative to the seat can be set. Fine adjustment is preferable.

  Furthermore, in the seat cushion having the above-described configuration, if the protruding portion formed by bulging in a substantially columnar shape is disposed on the distal end side of the retaining piece portion, the retaining piece portion can be seated during use. It is difficult to come out from the gap between the backrest and the backrest portion, which is preferable.

  In addition, the retaining piece portion may be formed by being bent into a substantially wave shape that is continuously formed along the front-rear direction, and even when the retaining piece portion has such a configuration, It is possible to accurately suppress the retaining piece portion from coming out of the gap between the seat portion and the backrest portion.

  The seat cushion of the present invention is suitable when the backrest cover portion is used as a lumbar support because the backrest cover portion can be arranged so as to be independent along the backrest portion.

1 is a perspective view of a vehicle seat with a lumbar support as a seat cushion according to an embodiment of the present invention attached thereto. It is a schematic longitudinal cross-sectional view of the sheet | seat of the state which attached the lumbar support of embodiment. It is a longitudinal cross-sectional view of the lumbar support of embodiment. It is a disassembled perspective view which shows the cushion part and attachment member which comprise the lumbar support of FIG. It is a perspective view of the attachment member of the other form used for a lumbar support. It is sectional drawing of the VI-VI site | part of FIG. It is sectional drawing of the VII-VII site | part of FIG. It is sectional drawing of the VIII-VIII site | part of FIG. It is a general | schematic partial expanded longitudinal cross-sectional view of the sheet | seat of the state which attached the lumbar support using the attachment member of FIG. It is a perspective view of the attachment member of another form used for a lumbar support. It is sectional drawing of the XI-XI site | part of FIG. It is a perspective view of the attachment member of another form used for a lumbar support. It is sectional drawing of the XIII-XIII site | part of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the embodiment, as shown in FIG. 1, a lumbar support 8 will be described as an example of a seat cushion. In the present specification, the vertical, front-rear, left-right directions will be described in the same manner as the vertical, front-back, left-right directions of the seat 1 unless otherwise specified.

  A vehicle seat (hereinafter simply abbreviated as “seat”) 1 to which the lumbar support 8 of the embodiment is attached includes a seat portion 3 and a backrest extending upward from the rear end of the seat portion 3 as shown in FIGS. Part 4 and a headrest 5 disposed on the upper end side of the backrest part 4. The seat portion 3 is configured to be slightly inclined with respect to the horizontal direction so that the upper surface thereof is rearwardly lowered, and the backrest portion 4 is configured to be inclined with respect to the vertical direction so that the upper end side is directed rearward. ing. In the seat 1 of the embodiment, the inclination angle θ (see FIG. 2) with respect to the horizontal surface of the lower front surface of the backrest portion 4 is set to about 75 °.

  As shown in FIGS. 3 and 4, the lumbar support 8 is attached to the seat 1 so that the cushion portion 9 as the backrest cover portion disposed on the front surface side of the backrest portion 4 and the cushion portion 9 is along the backrest portion 4. And an attachment member 14.

  In the case of the embodiment, the cushion part 9 is arranged in the region of the lower half of the backrest part 4, and the outer shape is a flat and substantially triangular prism shape with a flat side on the rear side, and In the case of the embodiment, the front side is formed from a low-resilience polyurethane foam. On the outer peripheral side of the cushion portion 9, a skin 10 made of a woven fabric having flexibility is arranged so as to cover the entire circumference. In the case of the embodiment, the skin 10 is overlapped at least in the region on the rear surface side of the cushion portion 9, and in the region on the rear surface side, the skin 10 is formed so as to be substantially along the vertical direction at two positions separated left and right. They are sewn together by the substantially straight stitched portions 10a and 10a (see FIG. 4). In the case of the embodiment, the suture portions 10 a and 10 a are formed over substantially the entire upper and lower portions of the cushion portion 9. Further, in the two-layered epidermis 10, the region between the sutured portions 10a and 10a can be separated from each other including the lower edge side. In the embodiment, the connection support plate 15 of the mounting member 14 is formed on the rear surface side of the cushion portion 9 such that the region of the two-layered skin 10 surrounded by the stitched portions 10a and 10a is formed into a pocket shape opened downward. An insertion recess 11 that can be inserted from below is configured. The insertion recess 11 is configured such that the opening width dimension is substantially the same as the width dimension of the connection support plate 15 on the left-right direction side.

  The attachment member 14 is formed by bending a flexible plate material made of synthetic resin, and as shown in FIG. 4, a connection support plate 15 for attaching and supporting the cushion portion 9, A retaining piece 16 disposed between the seat portion 3 and the backrest portion 4 of the seat 1 and a connecting portion 18 that connects the connecting support plate 15 and the retaining piece 16 are provided. In the case of the embodiment, the attachment member 14 is formed from a thermoplastic resin having a certain degree of rigidity such as polyacetal resin (POM) or polypropylene resin (PP) and having flexibility.

  The connection support plate 15 has a substantially rectangular plate shape. In the case of the embodiment, the width dimension on the left and right direction side is substantially matched with the opening width dimension of the insertion recess 11, and the longitudinal direction is substantially vertical. It is made into the substantially rectangular plate shape along. The retaining piece 16 has a width dimension on the left-right direction side that matches the width dimension on the left-right direction side of the connection support plate 15, and is connected to the base portion 15 b side of the connection support plate 15 ( It is formed so as to extend from the lower end side, and has a protruding portion 17 on the tip end 16a side. The retaining piece 16 is a part that is inserted so as to be sandwiched between the seat 3 and the backrest 4 in the seat 1. The protruding portion 17 is a portion that is arranged to protrude rearward from between the seat portion 3 and the backrest portion 4 when the retaining piece 16 is inserted between the seat portion 3 and the backrest portion 4. It is formed so as to bulge from the retaining piece 6 into a substantially cylindrical shape so that the axial direction is substantially along the left-right direction. The protrusion 17 is made of polyethylene foam. In the case of the embodiment, the connecting portion 18 that connects the connecting support plate 15 and the retaining piece 16 is partially disposed at two positions on the left and right edges excluding the center side, as shown in FIG. Has been. In the case of the embodiment, each connecting portion 18, 18 is configured such that the outer edge on the left and right direction side coincides with the left edge or the right edge of the connecting support plate 15 and the retaining piece portion 16, and the width on the left and right direction side. The dimension is configured to be curved along the longitudinal direction as a substantially belt-like shape set to about １ ／ of the width dimension of the connection support plate 15 on the left-right direction side.

  In the mounting member 14 according to the embodiment, the connecting support plate 15 and the retaining piece 16 are urged so that the ends 15a and 16a approach each other, and the backrest 4 is attached to the seat 1. It is comprised so that the lower end of can be clamped in the front-back direction. Specifically, in the mounting member 14 of the embodiment, as shown in FIGS. 3 and 4, the crossing angle α between the connection support plate 15 and the retaining piece 16 is made small in the non-attached state to the seat 1. In addition, the curved shape of the connecting portion 18 is increased. In the case of the embodiment, the crossing angle α (see FIG. 3) between the connection support plate 15 and the retaining piece 16 is set to about 15 ° in the non-attached state to the seat 1, and the backrest 4 described above. Is set to be about 1/5 of the inclination angle θ (see FIG. 2) with respect to the horizontal surface of the front surface on the lower end side. The mounting member 14 of the embodiment is configured such that the tips 15a and 16a of the connection support plate 15 and the retaining piece 16 are mutually connected by setting the crossing angle α between the connection support plate 15 and the retaining piece 16 small. Is attached to the seat 1 so that the connecting support plate 15 and the retaining piece 16 are strongly attached so that the ends 15a and 16a are close to each other when attached to the seat 1. The power is exerted, and the lower end of the backrest 4 can be firmly held in the front-rear direction by the connection support plate 15 and the retaining piece 16.

  The lumbar support 8 according to the embodiment is configured such that the retaining piece 16 of the attachment member 14 in a state in which the coupling support plate 15 is inserted into the insertion recess 11 and the cushion portion 9 is attached, the seat portion 3 of the seat 1 and the backrest portion 4. If the protrusion 17 disposed on the tip 16a side of the retaining piece 16 is protruded rearward from between the seat 3 and the backrest 4, the seat 1 can be attached. Can do.

  In the lumbar support 8 according to the embodiment, when the retaining piece 16 is attached to the seat 1 so as to be inserted between the seat portion 3 and the backrest portion 4 of the seat 1, the cushion portion as a backrest cover portion is provided. 9, the connecting support plate 15 inserted into the insertion recess 11 and the retaining piece 16 are urged so that the ends 15a, 16a approach each other, and the lower end of the backrest 4 is moved in the front-rear direction. It becomes an aspect which is pinched by. That is, in the lumbar support 8 of the embodiment, the connection support plate 15 to which the cushion portion 9 is attached always has the tip 15a (upper end) rearward (the tip 16a side of the retaining piece 16) at the time of attachment to the seat 1. Since the upper end 9a side of the cushion portion 9 is pressed against the backrest portion 4 so that the cushion portion 9 is self-supported, the backrest portion 4 can be met. As a result, in the lumbar support 8 of the embodiment, the cushion portion 9 is restrained from being forwardly tilted by simply inserting the retaining piece portion 16 of the mounting member 14 between the seat portion 3 and the backrest portion 4. In this state, it can be attached to the seat 1 so as to be along the backrest portion 4, and attachment work to the seat 1 is easy. Of course, if the retaining piece 16 is moved so as to be strongly pulled out from between the seat 3 and the backrest 4, it can be detached from the seat 1 and the removal work is easy.

  Therefore, the lumbar support 8 according to the embodiment can be easily attached to and detached from the seat 1 and can be arranged so that the cushion portion 9 is along the backrest portion 4.

  Further, in the lumbar support 8 of the embodiment, the protruding portion 17 formed by bulging in a substantially columnar shape is disposed on the tip end 16a side of the retaining piece portion 16 in the mounting member 14, so that it can be removed during use. It is difficult for the stopper piece portion 16 to come out from the gap between the seat portion 3 and the backrest portion 4. Of course, if it is configured to have other retaining means, a mounting member having a structure in which the protruding portion is not disposed on the distal end side of the retaining piece may be used.

  Moreover, you may use the thing of the structure shown to FIG.5, 6 as the attachment member 21 which attaches the cushion part 9. FIG. The mounting member 21 shown in FIGS. 5 and 6 has the same configuration as the above-described mounting member 14 except for the connecting portion 22, and the same member is described in detail by adding “A” to the end of the same figure symbol. Description is omitted.

  In the mounting member 21, the connecting portion 22 that connects the connecting support plate 15 </ b> A and the retaining piece 16 </ b> A is divided into a plurality (four in the case of the embodiment) on the left and right side, On the side (front and lower when attached to the seat 1), and the inner side arranged on the inner side (upward and rearward when attached to the seat 1) on the upper and lower sides than the outer connecting portion 23 And a connecting portion 24. In the case of the embodiment, the inner connecting portion 24 is configured so that the left and right outer edges of the mounting member 21 are aligned with the left edge or the right edge of the connecting support plate 15A and the retaining piece 16A. The outer connecting parts 23 are arranged at two places, and the inner connecting parts 24 are arranged so that the slits 22a are interposed between the inner connecting parts 24 at two positions on the inner side of the inner connecting parts 24 in the left-right direction. Yes. In the case of the embodiment, the inner connecting portions 24 and the outer connecting portions 23 are configured to have substantially the same width dimension, and are each configured as a substantially band-like shape that is narrower than the connecting portion 18 in the mounting member 14 described above. The vertical dimension L1 (see FIG. 8) is set smaller than the vertical dimension L2 (see FIG. 7) of the outer connecting portion 23. Specifically, the length dimensions L1 and L2 of the inner connecting portion 24 and the outer connecting portion 23 indicate the length dimensions of the region between the ends of the slit 22a (see FIGS. 7 and 8). The difference in length between the inner connecting portion 24 and the outer connecting portion 23 is that the tips 15a and 16a are close to each other between the connecting support plate 15A and the retaining piece portion 16A when attached to the seat 1. It is set to a dimensional difference that can exert an urging force. Also in this attachment member 21, when not attached to the seat 1, the crossing angle β (see FIG. 6) between the connection support plate 15A and the retaining piece 16A is set to about 15 °.

  If the mounting member 21 having such a configuration is used, in addition to setting the crossing angle β between the connecting support plate 15A and the retaining piece 16A to be small, the connecting portion 22 is made to be an inner connecting portion having a small length. 24, the urging force that acts to bring the tips 15a and 16a of the connecting support plate 15A and the retaining piece 16A closer to each other when attached to the seat 1 can be further increased. Thus, the connecting support plate 15A and the retaining piece 16A are difficult to open so as to separate the tips 15a and 16a from each other, so that the cushion portion 9 is surely aligned with the backrest portion 4 when attached to the seat 1. be able to. In particular, in the lumbar support 8A using the mounting member 21, the inner connecting portion 24 is disposed inside the outer connecting portion 23 when mounted on the seat 1, so that the front surface on the lower side of the backrest portion 4 is up and down. As a configuration that is curved along the vertical direction so that the center side of the front portion protrudes forward, a substantially triangular gap is formed between the front lower corner of the backrest portion 4 and the seat portion 3. However, the inner connecting portion 24 enters the gap so that the connecting support plate 15A arranged so as to continue from the outer connecting portion 23 is directed forward while the upper end is separated from the backrest portion 4. Standing up can be suppressed, and the connecting support plate 15A and the cushion portion 9 can be accurately aligned with the backrest portion 4.

  Further, as the attachment member 27, one having the configuration shown in FIGS. The attachment member 27 shown in FIGS. 10 and 11 has substantially the same configuration as the above-described attachment member 14 except for the connecting portion 28, and the same member is detailed by adding “B” to the end of the same reference numeral. The detailed explanation is omitted.

  In the mounting member 27, there are a plurality of connecting portions 28 that connect the connecting support plate 15 </ b> B and the retaining piece portion 16 </ b> B on the left and right side as in the case of the connecting portion 22 in the mounting member 21 (four in the case of the embodiment). ) And is arranged on the outer side on the vertical direction side (front lower side when attached to the seat 1) and the inner side on the vertical direction side of the outer coupling part 29 (seat 1 and an inner connecting portion 30 arranged at the rear upper side when attached to 1. In the mounting member 27, the outer connecting portion 29 is configured so that the left and right outer edges of the mounting member 27 coincide with the left or right edge of the connecting support plate 15B and the retaining piece 16B. It is arranged at two places. Then, the inner connecting portion 30 is inward in the left-right direction from the outer connecting portion 29 and has two regions separated from each other in the left-right direction so as to have a region overlapping the outer connecting portion 29 in the left-right direction. Is formed. In this attachment member 27, the inner connecting portion 30 is composed of a belt-like rubber-like elastic body in which both end sides are connected to the connecting support plate 15B and the retaining piece portion 16B. Also in this attachment member 27, when not attached to the seat 1, the crossing angle γ (see FIG. 11) between the connection support plate 15B and the retaining piece 16B is set to about 15 °. In a non-attached state to the seat 1, 30 is arranged so as to linearly connect the connection support plate 15B and the retaining piece 16B in a non-extended state. That is, when the inner connecting portion 30 is attached to the seat 1, the inner connecting portion 30 is in an expanded state and is urged in the contracting direction.

  If the mounting member 27 having such a configuration is used, in addition to setting the crossing angle γ between the connecting support plate 15B and the retaining piece 16B to be small, the inner connecting portion 30 is biased in the contracting direction. Since it is composed of a rubber-like elastic body, the inner connecting portion 30 can bias the connecting support plate 15B and the retaining piece portion 16B so that the tips 15a and 16a are always close to each other. At the time of attachment to 1, the cushion portion 9 can be reliably placed along the backrest portion 4. Further, by configuring the inner connecting portion 30 from a belt-like rubber-like elastic body, a predetermined urging force can be ensured, and the lumbar support can be stably attached to the seat 1.

  Further, as the attachment member 33 for attaching the cushion portion 9, one having the configuration shown in FIGS. The mounting member 33 shown in FIGS. 12 and 13 is formed by bending a flexible plate-shaped material made of synthetic resin, and includes a connection support plate 34 for mounting and supporting the cushion portion 9, and a seat. And a connecting piece 18 that connects the connecting support plate 34 and the retaining piece 36 to each other. The connection support plate 34 is configured such that the vertical and horizontal width dimensions thereof coincide with the connection support plate 15 in the mounting member 14 described above, and the unevenness 35 is continuously arranged on the left and right side edges 34a and 34b. Has been. The retaining piece 36 has a width dimension on the left and right direction side that matches the width dimension on the left and right direction side of the connection support plate 34, and is connected to the base portion 34 b side ( It is formed so as to extend from the lower end side, and is formed in a curved shape that is continuously formed along the front-rear direction. In the case of the embodiment, the retaining piece 36 is formed to be curved in a substantially wave shape over substantially the entire front and rear, except for the tip side. In the attachment member 33, the connection portion 18 has the same configuration as the connection portion 18 in the attachment member 14 described above, and the crossing angle of the connection support plate 34 and the retaining piece portion 36 when not attached to the seat 1. α is also configured to coincide with the crossing angle α between the connection support plate 15 and the retaining piece 16 in the mounting member 14.

  If the mounting member 33 having such a configuration is used, the concave and convex portions 35 are continuously disposed on the left and right side edges 34a and 34b of the coupling support plate 34, so that the coupling of the cushion portion 9 to the insertion concave portion 11 is achieved. The frictional resistance of the support plate 34 can be increased, and the upper and lower positions of the cushion portion 9 can be stopped by the frictional force generated between the inner surface of the insertion recess 11 and the connection support plate 34. The height position of the cushion portion 9 relative to the seat 1 can be finely adjusted. Even when the mounting member 33 having the above-described configuration is used, the retaining piece 36 is curved into a substantially wave shape that is continuously formed in the front-rear direction (the insertion direction of the retaining piece 36). Therefore, it is possible to accurately prevent the retaining piece 36 from coming out of the gap between the seat 3 and the backrest 4 during use.

  In the embodiment, the lumbar support 8 is described as an example of the seat cushion. However, the seat cushion to which the present invention can be applied is not limited to the lumbar support, for example, the upper surface of the seat portion. The present invention can also be applied to a seat cushion having a seat cover portion covering the side and a back cover portion covering the front side of the backrest portion.

  DESCRIPTION OF SYMBOLS 1 ... Seat (vehicle seat), 3 ... Seat part, 4 ... Backrest part, 8 ... Lumber support (seat cushion), 9 ... Cushion part (backrest cover part), 11 ... Insertion recessed part, 14, 21, 27 , 33 ... Mounting member, 15, 15A, 15B, 34 ... Connection support plate, 16, 16A, 16B, 36 ... Retaining piece part, 17 ... Projection part, 18, 22, 28 ... Connection part, 23, 29 ... Outside Connection part, 24, 30 ... inner connection part.

Claims (7)

A seat cushion having a back cover cover portion disposed on the front side of at least the back portion of the vehicle seat and attached to the vehicle seat,
The backrest cover portion disposed on the front side of the backrest portion, and an attachment member that attaches the backrest cover portion to the seat so as to be along the backrest portion,
The mounting member is formed by bending a flexible plate material made of synthetic resin,
A substantially rectangular plate-shaped connection support plate for supporting the backrest cover portion;
The connecting and supporting plate is formed so as to extend from the base portion side, and between the seat portion and the backrest portion of the seat, it is detached from between the seat portion and the backrest portion after being inserted backward. A retaining piece arranged to be suppressed,
With
The backrest cover portion is configured with a lower opening on the rear surface side, and includes a pocket-shaped insertion recess into which the connection support plate can be inserted from below, the connection support plate and the retaining piece portion. A seat cushion, wherein the seat cushion is configured to be biased so that the leading end sides approach each other and to be able to sandwich the lower end of the backrest portion in the front-rear direction when attached to the seat. The connection part for connecting the connection support plate and the retaining piece part is divided into a plurality in the left-right direction side,
An outer connecting portion disposed on the outer side in the vertical direction;
An inner connecting portion which is arranged inward in the vertical direction side than the outer connecting portion, and is set to have a length dimension smaller than that of the outer connecting portion so that the urging force can be exerted when attached to the seat;
The seat cushion according to claim 1, wherein the seat cushion is provided.   The seat cushion according to claim 2, wherein the inner connecting portion is made of a rubber-like elastic body that exerts an urging force.   The seat cushion according to any one of claims 1 to 3, wherein the connection support plate has unevenness continuously arranged on left and right side edges.   The seat cushion according to any one of claims 1 to 4, wherein the retaining piece portion includes a protruding portion formed to bulge in a substantially columnar shape on the distal end side.   The seat cushion according to any one of claims 1 to 4, wherein the retaining piece portion is curved in a substantially wave shape formed continuously along the front-rear direction. .   The seat cushion according to any one of claims 1 to 6, wherein the backrest cover portion is a lumbar support.

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