Seat

Abstract

Provided is a seat capable of appropriately reducing sway of a seated person in a yaw direction even if a main cushion plate is separated from a side cushion plate. A seat is provided with a seat back (1) having a seat cushion body (2) that elastically supports a seated person, and a back frame (3) that supports the seat cushion body from the seat back side. The cushion body is composed of three divided elements, namely a main cushion plate (2A) which forms the central part in the width direction of the seat and side cushion plates (2B) which form the two side parts in the width direction of the seat. The main pad (2A) has a main pad (A1) and a main base material (A3) that comes into contact with the back surface of the main pad (A1). Each of the side pads (2B) has a side pad (B1) and a side base material (B3) fixed to the backrest frame (3) so as to abut against the back surface of the side pad (B1). Each side base material (B3) has an extending portion (B32) extending across the dividing line (L) so as to support the main base material (A3) from the seat back side.

Description

Technical Field

[0001] The present invention relates to a seat. More specifically, it relates to a seat having a seat cushion body that elastically supports a seated person and a seat frame that supports the seat cushion body from the back side of the seat. Background Art

[0002] In Patent Document 1, there is disclosed a seat in which a seat cushion body composed of a seat cushion and a seat cover that wraps the seat cushion is divided into three parts in the seat width direction. Specifically, the seat cushion body is divided into a main cushion plate that constitutes the central part in the seat width direction and side cushion plates that constitute the both side parts in the seat width direction. The main cushion plate and each side cushion plate are fixed to the seat frame separately.

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020 - 33005. Summary of the Invention Problems to be Solved by the Invention

[0004] In the structure described in Patent Document 1, the cushions of the main cushion plate and each side cushion plate are not connected to each other, so the main cushion plate is likely to sink. Therefore, it is not possible to appropriately suppress the swaying of the seated person in the yaw direction. Accordingly, the present invention provides a seat that can appropriately reduce the swaying of the seated person in the yaw direction even when the main cushion plate is separated from the side cushion plates. Means for Solving the Problems

[0005] As a means for solving the above problems, the seat of the present invention takes the following means.

[0006] That is, a first aspect of the present invention is a seat having a seat cushion body that elastically supports a seated person and a seat frame that supports the seat cushion body from the back side of the seat. The seat cushion body is composed of three divided elements: a main cushion plate that constitutes the central part in the seat width direction and side cushion plates that constitute the both side parts in the seat width direction. The main cushion plate has a main cushion that constitutes the seat cushion and a main base material that abuts against the back surface of the cushion of the main cushion. Each side cushion plate has a side cushion that constitutes the seat cushion and a side base material that is fixed to the seat frame so as to abut against the back surface of the cushion of the side cushion. One of the base materials of the main base material and each side base material has an extension portion that extends toward the other base material so as to straddle the dividing line between them in the seat width direction. By the support of the other base material for the extension portion from the back side of the seat or the support of the extension portion for the other base material from the back side of the seat, the main base material is supported by each side base material from the back side of the seat.

[0007] According to the first aspect, since the main base material is supported by each side base material from the back side of the seat, it is difficult for the main cushion plate to sink toward the back side of the seat. Therefore, even when the main cushion plate is separated from each side cushion plate, it is possible to reduce the swaying of the seated person in the yaw direction.

[0008] In the second aspect of the present invention, in the above first aspect, the base material on the side where the extension extends is each of the side base materials, and the base material on the other side supported by the extension from the back side of the seat is the main base material.

[0009] According to the second aspect, after assembling each side cushion plate to the seat frame, the main cushion plate can be assembled to the seat frame without any obstacles.

[0010] In the third aspect of the present invention, in the above second aspect, the main cushion plate further has a main cover that covers the main cushion from the front side of the seat, and the main cover has a base material covering portion that covers the main base material from the back side of the seat in a manner of being interposed between the main base material and the extension.

[0011] According to the third aspect, by interposing the base material covering portion of the main cover between the main base material and the extension, it is possible to reasonably suppress abnormal noises generated by the direct contact between the main base material and the extension.

[0012] In the fourth aspect of the present invention, in the above second or third aspect, the seat further has a lumbar support member, the lumbar support member is mounted on the seat frame and supports the main cushion plate in a planar manner from the back side of the seat, and the extension extending from each of the side base materials extends to a position sandwiched between the lumbar support member and the main cushion plate.

[0013] According to the fourth aspect, it is configured that the extension extending from each side base material extends to a position supported by the lumbar support member of the main cushion plate. Therefore, by such a relatively long extension, the main base material can be more appropriately supported from the back side of the seat.

[0014] According to the fifth aspect of the present invention, in any one of the first to third aspects, the extension is provided at a position above the seat back that is higher than the pelvic support portion of the main cushion plate that supports the pelvis of the seated person, or is provided at a position in front of the seat cushion that is in front of the ischial support portion of the main cushion plate that supports the ischium of the seated person.

[0015] According to the fifth aspect, it is possible to appropriately suppress the rotation of the seated person in the yaw direction. As a result, it is possible to more appropriately reduce the swaying of the seated person in the yaw direction.

[0016] In the sixth aspect of the present invention, in any one of the first to third aspects, the main base material is fixed to the seat frame.

[0017] According to the sixth aspect, the main base material itself is also supported by the seat frame, whereby it is possible to further appropriately reduce the swaying of the seated person in the yaw direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a perspective view showing a schematic structure of a seat according to a first embodiment.

[0019] Figure 2 It is an exploded perspective view of the seat back.

[0020] Figure 3 It is an exploded perspective view of removing the cloth-like member from the backrest frame.

[0021] Figure 4 It is a top view showing the state where the cloth-like member is assembled to the backrest frame.

[0022] Figure 5 It is a rear view showing the state where the cloth-like member is assembled to the backrest frame.

[0023] Figure 6 It is a front view showing the state where the cloth-like member is assembled to the backrest frame.

[0024] Figure 7 It is a perspective view of observing the seat cushion body from the back side.

[0025] Figure 8 It is a rear view of the seat cushion body.

[0026] Figure 9 It is a front view showing the state where each side cushion plate is assembled to the backrest frame.

[0027] Figure 10 It is a front view showing the state where the main cushion plate is assembled to the backrest frame.

[0028] Figure 11 It is Figure 10 an exploded perspective view showing only the main cushion plate as the main base material in

[0029] Figure 12 It is Figure 10 a cross-sectional view taken along line XII-XII of

[0030] Figure 13 It is Figure 10 a cross-sectional view taken along line XIII-XIII of

[0031] Figure 14 It is Figure 10 a cross-sectional view taken along line XIV-XIV of

[0032] Figure 15 It is Figure 10 a cross-sectional view taken along line XV-XV of Detailed Embodiment

[0033] Hereinafter, the embodiments for implementing the present invention will be described with reference to the drawings. 《First Embodiment》 (Schematic Structure of Seat S)

[0034] First, useFigures 1 to 15 The structure of the seat S according to the first embodiment of the present invention will be described. In addition, in the following description, when indicating various directions such as front-back, up-down, left-right, etc., it refers to the respective directions shown in each figure.

[0035] In addition, when indicating in each direction such as the "seat width direction" by labeling "seat", it refers to the respective directions based on the seat S. In addition, in the following description, when no specific reference figure is shown, or when there is no corresponding reference numeral in the reference figure, any one of the figures Figures 1 to 15 is appropriately referred to.

[0036] As Figure 1 shown, the seat S according to this embodiment is configured as a single-seat mounted on an automobile. The seat S includes a seat back 1 that serves as the backrest of the occupant, an unillustrated seat cushion that serves as the seating portion, and a headrest H that serves as the headrest portion.

[0037] The lower end portions on the left and right sides of the seat back 1 are connected to the rear end portions on the left and right sides of the seat cushion via an unillustrated reclining adjuster. Thus, the seat back 1 can appropriately adjust the backrest angle relative to the seat cushion.

[0038] As Figure 2 shown, the seat back 1 has a seat cushion body 2 that elastically supports the back of the occupant and a backrest frame 3 that supports the seat cushion body 2 from the seat back side (rear side). The seat cushion body 2 is divided into three divided elements: a main cushion plate 2A that constitutes the central portion in the seat width direction and side cushion plates 2B that constitute the side portions in the seat width direction. Here, the backrest frame 3 corresponds to the "seat frame" of the present invention.

[0039] The backrest frame 3 is composed of metal members assembled into a frame shape when viewed from the front. A lumbar support member 3D that can improve the support condition of the occupant's waist is provided inside the frame of the backrest frame 3. The seat back 1 also has a cloth-like member 4 made of non-woven fabric stretched inside the frame of the backrest frame 3. The cloth-like member 4 is composed of so-called needle-punched non-woven fabric.

[0040] The cloth-like member 4 is a member that supports the main cushion plate 2A relative to the backrest frame 3 in a planar manner from the seat back side and has a function similar to that of a hammock. The cloth-like member 4 is stretched inside the frame of the backrest frame 3 so as to be located on the front side of the lumbar support member 3D.

[0041] The seat cushion body 2 is divided into the main cushion plate 2A and the side cushion plates 2B as described above, so that replacement corresponding to the specifications can be performed for each divided element. The main cushion plate 2A and the side cushion plates 2B can be assembled to the backrest frame 3 simply by approaching from the front of the seat.

[0042] The main cushion 2A is separated from each side cushion 2B, and thus it is likely to sink toward the seat back with respect to the load received from the back of the seated person. The reason is that the cushions of the main cushion 2A and each side cushion 2B are not connected to each other.

[0043] If the main cushion 2A is likely to sink toward the seat back, then when the vehicle turns, the support of the main cushion 2A for the body of the seated person becomes insufficiently effective. As a result, the body of the seated person is likely to sway in the yaw direction.

[0044] Therefore, the seat S according to the present embodiment is configured such that, in order to appropriately suppress the sway of the body of the seated person in the yaw direction, the main cushion 2A can be appropriately supported from the seat back side. One of them is a structure in which the main cushion 2A is supported from the seat back side by the above-described cloth-like member 4. (Structure of the backrest frame 3)

[0045] Hereinafter, the specific structures of the respective parts of the seat backrest 1 will be described in detail. First, the structure of the backrest frame 3 will be described. As Figure 3 shown, the backrest frame 3 has a pair of left and right long plate-shaped side frames 3A that extend in the seat height direction along the left and right side portions of the seat backrest 1.

[0046] In addition, the backrest frame 3 has an upper frame 3B that extends in the seat width direction along the upper side portion of the seat backrest 1. In addition, the backrest frame 3 has a lower frame 3C that extends in the seat width direction along the lower side portion of the seat backrest 1.

[0047] In addition, the backrest frame 3 further has a lumbar support 3D that is provided in a manner of being suspended from the upper frame 3B between the respective side frames 3A. The lower portion of the lumbar support 3D is elastically supported from the seat back side by the lower frame 3C via a spring (not shown).

[0048] Brackets 3E are bolted to the outer sides of the respective side frames 3A. Hook claws E1 are formed on these brackets 3E, and the hook claws E1 can hook the upper and lower two side hook holes 4B formed at the left and right end portions of the cloth-like member 4. Each hook claw E1 is formed in a claw shape that protrudes from each bracket 3E toward the rear of the seat.

[0049] In addition, on the upper frame 3B, at two positions on the left and right thereof, four-corner cylindrical headrest support brackets B5 that extend in the seat height direction are welded in a manner of penetrating in the seat height direction. These headrest support brackets B5 serve as a holder portion for inserting and installing a pair of left and right headrest pillars (not shown) hanging from the Figure 1 headrest H described above from above the seat. (Structure of the cloth-like member 4)

[0050] The above-described cloth-like member 4 is assembled to the backrest frame 3 in the following manner. AsFigure 4 As shown, first, the left and right upper hook holes 4A formed at the upper end portions on the upper side of the cloth-like member 4 are hooked through the front end portions of the respective headrest support brackets B5 protruding upward from the upper frame 3B above the seat from above the seat.

[0051] Next, the cloth-like member 4 is suspended from the front side of the backrest frame 3 with the hooked upper end portions on the upper side as fulcrums. And, as Figure 5 shown, the left and right end portions of the cloth-like member 4 are pulled in in a manner of winding around the respective side frames 3A from the outside to the rear side.

[0052] And, the upper and lower side hook holes 4B formed at the left and right end portions of the cloth-like member 4 are hooked through the corresponding hook claws E1 protruding rearward from the respective brackets 3E from the rear side of the seat. Thus, as Figure 6 shown, the cloth-like member 4 is stretched in a state of covering the front side of the seat across the upper frame 3B and the respective side frames 3A.

[0053] The lower end portion of the cloth-like member 4 is also hooked to the lower frame 3C of the backrest frame 3. Specifically, the lower end portion of the cloth-like member 4 is hooked to the lower frame 3C along with the Figure 2 assembly of the main cushion plate 2A to the backrest frame 3 as shown. The assembly of the lower end portion of the cloth-like member 4 will be described in detail together with the description of the main cushion plate 2A later.

[0054] Through the above assembly, the cloth-like member 4 is arranged in a state of covering the front edge of the respective side frames 3A and the side edge A5 of the front end bent inward in the seat width direction from the front of the seat. In addition, the cloth-like member 4 is arranged to extend across the dividing line L (refer to Figures 13 to 15 ) between the main cushion plate 2A and the respective side cushion plates 2B to be described later in the seat width direction. (Structure of the seat cushion body 2)

[0055] Next, the structures of the main cushion plate 2A and the respective side cushion plates 2B will be described. As Figure 2 and Figures 7 to 8 shown, the main cushion plate 2A has a main cushion A1 made of foamed polyurethane, a main cover A2 made of fabric covering the main cushion A1, and a main base material A3 made of resin that abuts against the main cushion A1 from the back side of the cushion.

[0056] The main cover A2 covers the main cushion A1 from the front side of the cushion. As Figures 7 to 8 shown, the upper side and the respective cover end portions on the left and right of the main cover A2 are pulled to the back side of the main cushion A1. And, the respective cover end portions of the main cover A2 are fixed to the respective peripheral edge portions of the main base material A3 that abuts against the back surface of the main cushion A1.

[0057] Through this fixation, the main cover A2 is integrated with the main base material A3 in such a way that the main gasket A1 is wrapped between the main cover A2 and the main base material A3. As a result, the main base material A3 is fixed in a state where it abuts against the back surface of the gasket of the main gasket A1 through the main cover A2.

[0058] As Figure 2 and Figures 7 to 8 shown, each side cushion plate 2B also has a side gasket B1 made of foamed polyurethane, a side cover B2 made of fabric covering the side gasket B1, and a side base material B3 made of resin that abuts against the side gasket B1 from the back side of the gasket.

[0059] Each side cover B2 covers the side gasket B1 from the front side of the gasket. As Figures 7 to 8 shown, the upper, lower, left, and right ends of each side cover B2 are pulled to the back side of the gasket of the side cushion B1. Moreover, the ends of these side covers B2 are fixed to the peripheral portions of the side base material B3 that abuts against the back surface of the gasket of the side cushion B1.

[0060] Through this fixation, each side cover B2 is integrated with the side base material B3 in such a way that the side gasket B1 is wrapped between the side cover B2 and the side base material B3. As a result, each side base material B3 is fixed in a state where it abuts against the back surface of the gasket of the side gasket B1 through the side cover B2.

[0061] As Figure 2 shown, the main cushion plate 2A and each side cushion plate 2B are separately assembled to the backrest frame 3 by approaching from the front of the seat. The main cushion plate 2A and each side cushion plate 2B are assembled to the backrest frame 3 after the cloth-like member 4 is assembled to the backrest frame 3.

[0062] Specifically, first, each side cushion plate 2B is assembled to the backrest frame 3. The steps are as follows. As Figure 7 shown, first, the fitting protrusion B31 that hangs down from the eaves portion on the back side of the base material formed at the upper edge portion of the side base material B3 of each side cushion plate 2B is hooked through the fitting holes B6 that open upward to the seat formed at the left and right end portions of the upper frame 3B from above the seat.

[0063] Next, each side cushion plate 2B is set to abut against each side frame 3A from the front side with the hooked upper end portion as a fulcrum. And each side cushion plate 2B is pressed against each side frame 3A from the front side.

[0064] Thereby, a clip (not shown) assembled to each side base material B3 is inserted into the mounting holes of the corresponding brackets 3E that are bolted to each side frame 3A from the front of the seat and is snap-fitted. As Figure 9 shown, as a result, each side cushion plate 2B is integrally fixed to the backrest frame 3.

[0065] After the above assembly, then the main cushion plate 2A (refer to Figure 2) is assembled on the backrest frame 3. The steps are as follows. Figure 7 As shown, first, the left and right upper hook holes A4 formed in the eaves portion extending from the upper edge of the main pad 2A to the rear of the seat are hooked through the front ends of the left and right headrest support brackets B5 protruding from the upper frame 3B to the top of the seat.

[0066] like Figure 12 As shown, the main pad 2A is then placed so as to abut against the lumbar support 3D (the cloth member 4 located in front of it) from the front side with the hooked upper end as a fulcrum. Then, the lower cover end of the main cover A2 is pulled toward the rear of the seat together with the lower part of the main cushion A1 by being wound around the lower frame 3C from the lower side.

[0067] Then, the hook member A22 composed of a resin J hook sewn to the cover end of the lower side of the main cover A2 is fixed by hooking it to the lower frame 3C from the lower side. Figure 10 As shown, as a result, the main pad 2A is integrally fixed to the back frame 3 in a state where the gaps (partition lines L) in the seat width direction between the main pad 2A and the side pads 2B are blocked.

[0068] like Figure 12 As shown, when the lower cover end of the main cover A2 is hooked on the lower frame 3C by the hook member A22, the hook member A22 first passes through the lower hook hole 4C formed at the lower end portion of the cloth-like member 4. Thus, as the lower cover end of the main cover A2 is fixed to the lower frame 3C, the lower end portion of the cloth-like member 4 is also fixed to the lower frame 3C via the main cover A2.

[0069] Thus, the cloth-like member 4 is also wound around the lower frame 3C from the lower side together with the main cover A2 and the main pad A1. Figure 7 ) is supported from the seat back side. In addition, the area from the middle portion to the lower portion of the main pad 2A is elastically supported from the seat back side by the lumbar support member 3D.

[0070] The main pad 2A is supported in a planar manner from the seat back side by a cloth-like member 4 stretched on the back frame 3 (see Figures 12 to 15 ). Through these supports, the main pad 2A can support the body of the seat occupant from the seat back side with a moderate sense of hardness.

[0071] Furthermore, even if a load in the yaw direction is input from the back of the seat occupant when the vehicle turns, the main pad 2A is not easily sunk toward the seat back because its two side portions are supported from the seat back side by the fabric member 4. With such a structure, the main pad 2A can support the body of the seat occupant and is not easily shaken in the yaw direction when the vehicle turns, even if it is separated from the side pads 2B.

[0072] As shown Figures 13 to 15 in FIG. 2, the cloth-like member 4 is provided so as to extend across the dividing line L between the main seat cushion 2A and each side seat cushion 2B in the seat width direction. Therefore, foreign matter can be prevented from entering the seat interior through the gap between the main seat cushion 2A and each side seat cushion 2B by the cloth-like member 4.

[0073] Substantially the entire area of each side seat cushion 2B in the seat height direction is supported by each side frame 3A from the seat back side. Each side seat cushion 2B has a structure in which its side base material B3 supports the side cushion B1 in a planar manner from the obliquely outer side of the seat back. Thus, each side seat cushion 2B can appropriately support the back of the seated person from both the left and right outer sides.

[0074] Specifically, the side base material B3 of each side seat cushion 2B supports the side cushion B1 in a planar manner from the obliquely outer side of the seat back through a surface portion that extends obliquely so as to cover these side frames 3A from the front side and the inner side in the seat width direction. With these structures, each side seat cushion 2B is configured to be less likely to sink toward the seat back side than the main seat cushion 2A.

[0075] As shown Figure 11 in FIG. 3, the main base material A3 of the main seat cushion 2A is formed in a frame shape when viewed from the front. Specifically, the main base material A3 is formed in a ladder shape in which the left and right frame side portions A32 are connected at a plurality of positions in the seat height direction.

[0076] On the left and right frame side portions A32 of the main base material A3, first side bulging portions A33 that bulge toward the front of the seat are formed in their lower regions. These first side bulging portions A33 are formed at positions where the configuration in the seat height direction overlaps with the pelvic support portion R of the main seat cushion 2A, that is, the portion that supports the pelvis of the seated person.

[0077] As shown Figure 13 in FIG. 4, specifically, each first side bulging portion A33 is configured to be extruded from the left and right frame side portions A32 of the main base material A3 toward the front of the seat in a form that forms an inclined surface M facing obliquely inward. In the main cushion A1, concave portions A11 that are recessed to match the shapes of these first side bulging portions A33 protruding from the main base material A3 are formed on the left and right side portions of its cushion back surface.

[0078] Thus, each first side bulging portion A33 is formed in a shape that bulges so as to enter the respective concave portions A11 of the main cushion A1. By the bulging of these first side bulging portions A33, the two side portions of the main cushion A1 of the main seat cushion 2A are thinner than the central portion, and the back of the seated person can be firmly supported from the seat back side by each first side bulging portion A33.

[0079] Specifically, each of the first side bulging portions A33 is configured such that their inclined surfaces M support the main cushion A1 in a planar manner from the outer side of the seat back diagonally. Thus, the main cushion plate 2A can support the pelvis of the seated person in a planar manner from the left and right outer sides by means of the inclined surfaces M of the first side bulging portions A33 of the main base material A3.

[0080] Through these supports, even when a yaw-direction load is input from the pelvis of the seated person during a vehicle turn, the two side portions of the main cushion plate 2A are strongly supported by the respective first side bulging portions A33 from the seat back side, and thus it is difficult to sink toward the seat back side. With such a structure, even when the main cushion plate 2A is separated from the respective side cushion plates 2B, it can support the body of the seated person so as to be difficult to sway in the yaw direction during a vehicle turn.

[0081] Specifically, each of the first side bulging portions A33 is formed on the main base material A3 fixed to the backrest frame 3. Therefore, through the first side bulging portions A33 of the main base material A3 supported by the backrest frame 3, it is possible to further appropriately reduce the yaw-direction sway of the seated person.

[0082] As Figure 11 shown, the upper seat-back regions of the left and right frame side portions A32 of the main base material A3 are supported in a planar manner from the seat back side by the extending portions B32 extending from the respective side base materials B3 toward the inner side in the seat width direction. These extending portions B32 are formed at positions above the pelvis support portion R of the main cushion plate 2A. Here, the main base material A3 corresponds to the "other base material" of the present invention. In addition, each side base material B3 on which the extending portion B32 is formed corresponds to the "one base material" of the present invention.

[0083] As Figure 14 shown, specifically, each of the extending portions B32 is configured to extend in a flat plate shape from the outer side to the inner side in the seat width direction across the dividing line L between the main cushion plate 2A and the respective side cushion plates 2B. Specifically, each of the extending portions B32 extends inward to a position overlapping with the lumbar support member 3D that supports the main cushion plate 2A from the back side of the cushion in the seat width direction.

[0084] Thus, each of the extending portions B32 is arranged in a manner of being sandwiched between the main cushion plate 2A and the lumbar support member 3D. Through the support of these extending portions B32 from the seat back side, the left and right side portions of the main cushion plate 2A can firmly support the back of the seated person from the seat back side.

[0085] Thus, even when a yaw-direction load is input from the pelvis of the seated person during a vehicle turn, the two side portions of the main cushion plate 2A are strongly supported by the respective extending portions B32 from the seat back side, and thus it is difficult to sink toward the seat back side. Thus, even when the main cushion plate 2A is separated from the respective side cushion plates 2B, it can support the body of the seated person so as to be difficult to sway in the yaw direction during a vehicle turn.

[0086] The left and right frame side portions A32 of the main base material A3 supported by each extension portion B32 from the seat back side are covered from the seat back side by the base material covering portion A21 which is a part of the cover end of the main cover A2 pulled into the seat back side. In this way, the base material covering portion A21 is interposed between the main base material A3 and each extension portion B32, so that direct contact between the main base material A3 and each extension portion B32 can be reasonably prevented. As a result, the generation of abnormal noise due to contact between resins can be appropriately suppressed. In addition, in Figures 7 to 8 In order to easily understand the structure of the main base material A3, the base material covering portion A21 is omitted from the illustration.

[0087] Each extension portion B32 extends from each side base material B3 toward the inner side in the seat width direction. Therefore, even if the main pad 2A is assembled to the back frame 3 after each side pad 2B is assembled to the back frame 3, each extension portion B32 does not hinder the assembly of the main pad 2A.

[0088] like Figure 11 As shown, on the left and right frame side portions A32 of the main base material A3, a second side bulging portion A34 bulging toward the front of the seat is formed in the middle area in the seat height direction between the first side bulging portion A33 and the extension portion B32. Figure 15 As shown, each second side bulging portion A34 is configured to be extruded from the left and right frame side portions A32 of the main base material A3 toward the front of the seat so as to form an inclined surface M facing obliquely inward.

[0089] The main pad A1 has recessed portions A11 formed on the left and right side portions of the pad back surface thereof, which are recessed to match the shapes of the second side bulging portions A34 protruding from the main base material A3. Thus, the second side bulging portions A34 are formed to bulge in the recessed portions A11 of the main pad A1. Due to the bulging of the second side bulging portions A34, the side portions of the main pad A1 of the main pad 2A are thinner than the central portion, and the back of the seat occupant can be firmly supported from the seat back side.

[0090] Specifically, each second side bulge A34 is configured such that its inclined surface M supports the main pad A1 in a planar manner from the outer side of the seat back. Thus, the main pad 2A can support the back of the seated person in a planar manner from both the left and right outer sides using the inclined surface M of each second side bulge A34 of the main base material A3.

[0091] With these supports, even if a load in the yaw direction is input from the back of the seat occupant when the vehicle turns, the main pad 2A is strongly supported on both sides by the second side bulges A34 from the seat back side, so that it is difficult to sink toward the seat back side. With such a structure, even if the main pad 2A is separated from the side pads 2B, it is possible to support the body of the seat occupant and make it difficult to shake in the yaw direction when the vehicle turns.

[0092] Specifically, each second side bulging portion A34 is formed on the main base material A3 fixed to the backrest frame 3. Therefore, through each second side bulging portion A34 of the main base material A3 supported by the backrest frame 3, it is possible to further appropriately reduce the sway of the seated person in the yaw direction.

[0093] In summary, the seat S according to the present embodiment is configured as follows. In addition, the reference numerals enclosed in parentheses below are the reference numerals corresponding to the respective structures shown in the above embodiment.

[0094] That is, the seat (S) has a seat cushion body (2) that elastically supports the seated person and a seat frame (3) that supports the seat cushion body (2) from the back side of the seat. The seat cushion body (2) is composed of three divided elements: a main cushion plate (2A) that forms the central portion in the seat width direction and each side cushion plate (2B) that forms the both side portions in the seat width direction. The main cushion plate (2A) has a main cushion (A1) that forms the seat cushion and a main base material (A3) that abuts against the back surface of the cushion of the main cushion (A1).

[0095] Each side cushion plate (2B) has a side cushion (B1) that forms the seat cushion and a side base material (B3) that is fixed to the seat frame (3) so as to abut against the back surface of the cushion of the side cushion (B1). One of the base materials (B3) in the main base material (A3) and each side base material (B3) has an extension portion (B32) that extends toward the other base material (A3) so as to straddle each other in the seat width direction. Through the support of the other base material (A3) by the extension portion (B32) from the back side of the seat, the main base material (A3) is supported by each side base material (B3) from the back side of the seat.

[0096] According to the above structure, the main base material (A3) is supported by each side base material (B3) from the back side of the seat, so that the main cushion plate (2A) is difficult to sink toward the back side of the seat. Therefore, even if the main cushion plate (2A) is separated from each side cushion plate (2B), it is possible to reduce the sway of the seated person in the yaw direction.

[0097] In addition, the base material (B3) on which the extension portion (B32) extends is each side base material (B3). The other base material (A3) supported by the extension portion (B32) from the back side of the seat is the main base material (A3). According to the above structure, after assembling each side cushion plate (2B) to the seat frame (3), the main cushion plate (2A) can be assembled to the seat frame (3) without any obstacles.

[0098] In addition, the main cushion plate (2A) further has a main cover (A2) that covers the main cushion (A1) from the front side of the seat. The main cover (A2) has a base material covering portion (A21) that covers the main base material (A3) from the back side of the seat in a manner that is interposed between the main base material (A3) and the extension portion (B32). According to the above structure, the base material covering portion (A21) of the main cover (A2) is interposed between the main base material (A3) and the extension portion (B32), thereby reasonably suppressing abnormal noises generated by the direct contact between the main base material (A3) and the extension portion (B32).

[0099] In addition, the seat (S) further has a lumbar support member (3D) that is attached to the seat frame (3) and supports the main cushion plate (2A) in a planar manner from the back side of the seat. The extension portion (B32) extending from each side base material (B3) extends to a position sandwiched between the lumbar support member (3D) and the main cushion plate (2A). According to the above structure, the extension portion (B32) extending from each side base material (B3) is structured to extend to a position supported by the lumbar support member (3D) of the main cushion plate (2A). Therefore, through such a relatively long extension portion (B32), the main base material (A3) can be more appropriately supported from the back side of the seat.

[0100] In addition, the extension portion (B32) is provided at a position above the seat of the seat backrest (1) that is higher than the pelvis support portion (R) of the main cushion plate (2A) that supports the pelvis of the seated person. According to the above structure, the rotation of the seated person in the yaw direction can be appropriately suppressed. As a result, the swaying of the seated person in the yaw direction can be more appropriately reduced.

[0101] In addition, the main base material A3 is fixed to the seat frame 3. According to the above structure, the main base material (A3) itself is also supported by the seat frame (3), thereby further appropriately reducing the swaying of the seated person in the yaw direction. 《Regarding Other Embodiments》

[0102] The embodiments of the present invention have been described using one embodiment, but the present invention can be implemented in various ways in addition to the above embodiments.

[0103] 1. The seat of the present invention can also be applied to transportation means other than automobiles, such as railways, airplanes, and ships. In addition, in addition to transportation means, the seat can also be provided in various facilities (for non-transportation use), such as sports facilities, theaters, concert halls, and event venues. The structure of the present invention can also be applied to the seat cushion in addition to the seat backrest.

[0104] 2. The extension portion can also be structured to extend outward in the seat width direction from the main base material toward each side base material. In this case, the extension portion needs to be formed to extend from the main base material (equivalent to "one base material") in a manner that is supported by each side base material (equivalent to "the other base material") from the back side of the seat.

[0105] When the structure of the present invention is applied to a seat cushion, preferably, a structure that supports the main substrate from the back side of the seat through the extension part on each side substrate is provided at a position in front of the seat relative to the ischial support part of the main cushion plate that supports the left and right ischiums of the seated person. With this configuration, it is possible to appropriately suppress the rotation of the seated person in the yaw direction. As a result, it is possible to more appropriately reduce the sway of the seated person in the yaw direction. In addition, the above structure may also be arranged at a position where the front-back direction arrangement of the seat overlaps with the ischial support part of the seat cushion.

[0106] 3. The main cover and / or the side cover may be made of leather material in addition to fabric. Explanation of reference numerals

[0107] 1 Seat back

[0108] 2 Cushion body

[0109] 2A Main cushion plate

[0110] A1 Main cushion

[0111] A11 Recess

[0112] A2 Main cover

[0113] A21 Substrate covering part

[0114] A22 Hanging part

[0115] A3 Main substrate (the other substrate)

[0116] A32 Frame side part

[0117] A33 First side bulging part

[0118] A34 Second side bulging part

[0119] A4 Upper hanging hole

[0120] 2B Side cushion plate

[0121] B1 Side cushion

[0122] B2 Side cover

[0123] B3 Side substrate (one substrate)

[0124] B31 Fitting protrusion

[0125] B32 Extension part

[0126] 3 Backrest frame (seat frame)

[0127] 3A Side frame

[0128] A5 Side edge

[0129] 3B Upper Frame

[0130] B5 Headrest Support Bracket

[0131] B6 Fitting Hole

[0132] 3C Lower Frame

[0133] 3D Lumbar Support

[0134] 3E Bracket

[0135] E1 Hooking Claw

[0136] 4 Cloth-like Component

[0137] 4A Upper Hooking Hole

[0138] 4B Side Hooking Hole

[0139] 4C Lower Hooking Hole

[0140] L Dividing Line

[0141] M Inclined Plane

[0142] R Pelvis Support Part

[0143] S Seat

[0144] H Headrest

Claims

1. A seat having a cushion body elastically supporting a seated person and a seat frame supporting the cushion body from a seat back side, The seat cushion body is composed of three divided elements: a main pad forming a central portion in the seat width direction and side pads forming both side portions in the seat width direction. The main pad includes a main pad constituting a seat pad and a main base material in contact with a pad back surface of the main pad. Each of the side pads includes a side pad constituting a seat pad and a side base material fixed to the seat frame in a manner abutting against a pad back surface of the side pad. The main substrate and one of the side substrates have an extension portion extending toward the other substrate in a manner spanning a dividing line between each other in the seat width direction, and the main substrate is supported by each of the side substrates from the seat back side through the extension portion supporting the other substrate from the seat back side or the other substrate supporting the extension portion from the seat back side.

2. The seat according to claim 1, wherein: The one base material from which the extending portion extends is each of the side base materials, and the other base material supported from the seat back side by the extending portion is the main base material.

3. The seat according to claim 2, wherein: The main pad also has a main cover covering the main pad from the seat front side. The main cover includes a base material covering portion that covers the main base material from a seat back side so as to be interposed between the main base material and the extending portion.

4. The seat according to claim 2 or 3, wherein: The seat further includes a lumbar support member, which is mounted on the seat frame and supports the main pad in a planar manner from the seat back side. The extension portion extending from each of the side base materials extends to a position sandwiched between the lumbar support member and the main pad.

5. The seat according to any one of claims 1 to 3, wherein: The extension portion is disposed in the seat back at a position above the seat than a pelvis supporting portion of the main pad that supports the pelvis of the seated person, or in the seat cushion at a position forward of the seat than a ischium supporting portion of the main pad that supports the ischium of the seated person.

6. The seat according to any one of claims 1 to 3, wherein: The main substrate is fixed to the seat frame.

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