Seat

Abstract

The invention provides 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 seat cushion body is composed of three divided elements, namely a main cushion plate (2A) forming the central part in the seat width direction and side cushion plates (2B) forming the two side parts in the seat width direction. The main cushion plate has a main cushion (A1) constituting a seat cushion, and a main base material (A3) in contact with the cushion back surface of the main cushion. The main base material has a pair of side bulging portions (first side bulging portions (A33)) in the seat width direction, the pair of side bulging portions bulging so as to enter a pair of recessed portions (A11) in the seat width direction, the recessed portions (A11) being formed on both sides of the cushion back surface of the main cushion in the seat width direction.

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 covers the seat cushion is divided into three in the seat width direction. Specifically, the seat cushion body is divided into a main cushion plate that constitutes the central portion in the seat width direction and side cushion plates that constitute the both side portions in the seat width direction. The main cushion plate and each side cushion plate are fixed to the seat frame independently.

[0003] Prior Art Documents

[0004] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-33005 Summary of the Invention

[0005] Problems to be Solved by the Invention

[0006] 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 impossible 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.

[0007] Means for Solving the Problems

[0008] As a means for solving the above problems, the seat of the present invention takes the following means.

[0009] That is, a first invention 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 portion in the seat width direction and side cushion plates that constitute the both side portions 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. The main base material has a pair of side bulging portions in the seat width direction, and the pair of side bulging portions in the seat width direction bulge so as to enter a pair of recesses in the seat width direction formed in both side portions of the back surface of the cushion of the main cushion in the seat width direction.

[0010] According to the first invention, by the pair of side bulging portions of the main base material, it is possible to support both side portions of the main cushion more strongly from the back side of the seat than the central portion. As a result, 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.

[0011] Based on the above first invention, the second invention of the present invention is such that a pair of the above-mentioned laterally bulging portions are disposed at a position overlapping with the pelvic support portion of the above-mentioned main cushion plate that supports the pelvis of the seated person in the seat height direction, or at a position overlapping with the ischial support portion of the above-mentioned main cushion plate that supports the left and right ischiums of the seated person in the seat front-rear direction.

[0012] According to the second invention, by means of a pair of laterally bulging portions of the main base material, rotation of the pelvis or the left and right ischiums of the seated person in the yaw direction can be suppressed. As a result, swaying of the seated person in the yaw direction can be more appropriately reduced.

[0013] Based on the above first or second invention, the third invention of the present invention is such that the above-mentioned main base material is fixed to the above-mentioned seat frame.

[0014] According to the third invention, by means of a pair of laterally bulging portions of the main base material supported by the seat frame, swaying of the seated person in the yaw direction can be further appropriately reduced.

[0015] Based on the above first or second invention, the fourth invention of the present invention is such that a pair of the above-mentioned laterally bulging portions have inclined surfaces, and the inclined surfaces are inclined so as to support the above-mentioned main cushion in a planar manner from the outer side of the seat back diagonally within the corresponding pair of the above-mentioned concave portions.

[0016] According to the fourth invention, by means of a pair of laterally bulging portions of the main base material, the seated person can also be appropriately supported from the lateral direction. As a result, swaying of the seated person in the yaw direction can be further appropriately reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view showing a schematic structure of a seat according to a first embodiment.

[0018] Figure 2 is an exploded perspective view of a seat back.

[0019] Figure 3 is an exploded perspective view after removing a cloth-like member from a backrest frame.

[0020] Figure 4 is a top view showing a state where a cloth-like member is assembled to a backrest frame.

[0021] Figure 5 is a rear view thereof.

[0022] Figure 6 is a front view thereof.

[0023] Figure 7 is a perspective view of a seat cushion body observed from the back side.

[0024] Figure 8 is a rear view of the seat cushion body.

[0025] Figure 9 It is a front view showing the state where each side cushion plate is assembled to the backrest frame.

[0026] Figure 10 It is a front view showing the state where the main cushion plate is assembled to the backrest frame.

[0027] Figure 11 It is Figure 10 The perspective view of the main cushion plate in

[0028] Figure 12 It is Figure 10 The sectional view taken along line XII - XII of

[0029] Figure 13 It is Figure 10 The sectional view taken along line XIII - XIII of

[0030] Figure 14 It is Figure 10 The sectional view taken along line XIV - XIV of

[0031] Figure 15 It is Figure 10 The sectional view taken along line XV - XV of Detailed implementation mode

[0032] Hereinafter, the mode for implementing the present invention will be described with reference to the drawings.

[0033] 《First Embodiment》

[0034] (Schematic structure of seat S)

[0035] First, the structure of the seat S of the first embodiment of the present invention will be described using Figures 1 to 15 . In the following description, when indicating the front - rear, up - down, left - right and other directions, it refers to the respective directions shown in each figure.

[0036] In addition, when each direction such as "seat width direction" is indicated with "seat" attached, it refers to the respective directions based on the seat S. 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 in Figures 1 to 15 will be appropriately referred to.

[0037] As shown in Figure 1 , the seat S of the present embodiment is configured as a single - person seat mounted on an automobile. The seat S includes: a seat back 1 that becomes the backrest of the sitter, a seat cushion (not shown) that becomes the seating part, and a headrest H that becomes the headrest part.

[0038] The lower end portions on the left and right sides of the seat backrest 1 are connected to the rear end portions on the left and right sides of the seat cushion via an angle adjuster (not shown). Thus, the seat backrest 1 can appropriately adjust the backrest angle relative to the seat cushion.

[0039] As Figure 2 shown, the seat backrest 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.

[0040] The backrest frame 3 is composed of metal parts assembled into a front view frame shape. 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 backrest 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.

[0041] 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 functions like a so-called hanging net. The cloth-like member 4 is stretched inside the frame of the backrest frame 3 in a position located in front of the lumbar support member 3D.

[0042] Since the seat cushion body 2 is divided into the main cushion plate 2A and the side cushion plates 2B as described above, it is possible to perform replacement corresponding to the specifications for each divided unit. The main cushion plate 2A and the side cushion plates 2B can be easily assembled relative to the backrest frame 3 simply by approaching from the front of the seat.

[0043] When the main cushion plate 2A is separated from the side cushion plates 2B, it is likely to sink toward the seat back side with respect to the load received from the back of the occupant. The reason is that the cushions of the main cushion plate 2A and the side cushion plates 2B are not connected to each other.

[0044] If the main cushion plate 2A is likely to sink toward the seat back side, the support of the main cushion plate 2A for the occupant's body becomes insufficient and ineffective when the vehicle turns. As a result, the occupant's body is likely to sway in the yaw direction.

[0045] Therefore, the seat S of the present embodiment is configured to appropriately support the main cushion plate 2A from the seat back side so that the sway of the occupant's body in the yaw direction can be appropriately suppressed. One of them is the structure in which the main cushion plate 2A is supported from the seat back side by the above-described cloth-like member 4.

[0046] (Structure of the backrest frame 3)

[0047] 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 extending in the seat height direction along the left and right side portions of the seat backrest 1.

[0048] In addition, the backrest frame 3 has an upper frame 3B extending 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 extending in the seat width direction along the lower side portion of the seat backrest 1.

[0049] In addition, the backrest frame 3 further has a lumbar support member 3D provided in such a manner as to be suspended from the upper frame 3B between the respective side frames 3A. The lower portion of the lumbar support member 3D is elastically supported from the seat back side by the lower frame 3C via a spring (not shown).

[0050] On the outer side portions of the respective side frames 3A, brackets 3E are bolted. Hook claws E1 are formed on these brackets 3E, and the hook claws E1 can hook onto 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 has a claw shape protruding rearward from the respective bracket 3E toward the seat.

[0051] In addition, on the upper frame 3B, at two positions on the left and right thereof, square tube-shaped headrest support brackets B5 extending in the seat height direction are welded in a manner of penetrating along the seat height direction. These headrest support brackets B5 serve as bracket portions for inserting and installing a pair of left and right headrest support columns (not shown) hanging down from the headrest H described in Figure 1 from above the seat.

[0052] (Structure of the cloth-like member 4)

[0053] The above-mentioned cloth-like member 4 is assembled to the backrest frame 3 in the following manner. As Figure 4 shown, first, by passing through the upper and lower two side hook holes 4A formed at the upper end portion of the cloth-like member 4 from above the seat through the front end portions of the respective headrest support brackets B5 protruding upward from the upper frame 3B, they are hooked.

[0054] Next, the cloth-like member 4 is suspended from the front side of the backrest frame 3 with the upper end portion hooked as described above. And, as Figure 5 shown, the left and right end portions of the cloth-like member 4 are pulled in a manner of being wound around the respective side frames 3A from the outside to the rear side.

[0055] And, by passing the upper and lower two side hook holes 4B formed at the left and right end portions of the cloth-like member 4 through the corresponding hook claws E1 protruding rearward from the respective brackets 3E from the rear side of the seat, they are hooked. Thus, as Figure 6As shown, the cloth-like member 4 is stretched across the upper frame 3B and each side frame 3A and covers from the seat front side in a state of covering.

[0056] The lower end portion of the cloth-like member 4 is also hooked on the lower frame 3C of the backrest frame 3. Specifically, the lower end portion of the cloth-like member 4 is hooked on the lower frame 3C along with the assembly of the main cushion plate 2A shown in Figure 2 to the backrest frame 3. 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.

[0057] Through the above assembly, the cloth-like member 4 is set in a state of covering the side edge A5 of the front end bent inward in the seat width direction of the leading edge of each side frame 3A from the front of the seat. In addition, the cloth-like member 4 is set to extend across the dividing line L (refer to Figures 13 to 15 ) between the main cushion plate 2A and each side cushion plate 2B described later in the seat width direction.

[0058] (Structure of the seat cushion body 2)

[0059] Next, the structures of the main cushion plate 2A and each side cushion plate 2B will be described. As shown in Figure 2 and Figures 7 to 8 , 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 back side of the main cushion A1 from the back side of the cushion.

[0060] The main cover A2 covers the main cushion A1 from the surface side of the cushion. As shown in Figures 7 to 8 , the upper side and the left and right end portions of the main cover A2 are pulled into the back side of the main cushion A1. And each end portion of the main cover A2 is fixed to the peripheral portions of the main base material A3 that abuts against the back surface of the main cushion A1.

[0061] Through this fixing, the main cover A2 is integrated with the main base material A3 in a manner that encloses the main cushion A1 between it and the main base material A3. As a result, the main base material A3 is fixed in a state of abutting against the back surface of the main cushion A1 through the main cover A2.

[0062] As shown in Figure 2 and Figures 7 to 8 , each side cushion plate 2B also has in the same way: a side cushion B1 made of foamed polyurethane, a side cover B2 made of fabric covering the side cushion B1, and a side base material B3 made of resin that abuts against the back side of the side cushion B1 from the back side of the cushion.

[0063] Each side cover B2 covers the side cushion B1 from the surface side of the cushion. As shown in Figures 7 to 8As shown, the upper, lower, left, and right ends of each side cover B2 are pulled into the back side of the cushion of the side cushion B1. Further, the end of each of these side covers B2 is fixed to each peripheral edge portion of the side base material B3 that abuts against the back surface of the cushion of the side cushion B1.

[0064] By this fixing, each side cover B2 is integrated with the side base material B3 in such a manner that the side cushion B1 is sandwiched therebetween. As a result, each side base material B3 is fixed in a state of abutting against the back surface of the cushion of the side cushion B1 via the side cover B2.

[0065] As Figure 2 shown, the main cushion 2A and each side cushion 2B are separately assembled to the backrest frame 3 by approaching from the front of the seat. The main cushion 2A and each side cushion 2B are assembled to the backrest frame 3 after the cloth-like member 4 is assembled to the backrest frame 3.

[0066] Specifically, first, each side cushion 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 2B is hooked by passing 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.

[0067] Next, each side cushion 2B is installed so as to abut against each side frame 3A from the front with the upper end portion of the above-described hooking as a fulcrum. Further, each side cushion 2B is pressed against each side frame 3A from the front.

[0068] Thereby, a clip (not shown) assembled to each side base material B3 is inserted into the mounting holes of the corresponding brackets 3E bolted to each side frame 3A from the front of the seat and is snap-fitted. As a result, as Figure 9 shown, each side cushion 2B is integrally fixed to the backrest frame 3.

[0069] After the above-described assembly, next, the main cushion 2A (refer to Figure 2 ) is assembled to the backrest frame 3. The steps are as follows. As Figure 7 shown, first, the left and right two upper side hooking holes A4 formed at the eaves portion extending rearward from the upper edge portion of the main cushion 2A are hooked by passing through the front end portions of the left and right two headrest support brackets B5 protruding upward to the seat from the upper frame 3B from above the seat.

[0070] As Figure 12 shown, next, the main cushion 2A is installed so as to abut against the lumbar support member 3D (cloth-like member 4 located in front thereof) from the front with the upper end portion of the above-described hooking as a fulcrum. Next, the lower end of the lower side of the main cover A2 and the lower portion of the main cushion A1 are pulled rearward to the seat in such a manner that they are wound around the lower frame 3C from below.

[0071] Further, a hook member A22 made of resin, which is the end of the cover sewn to the lower side of the main cover A2, is fixed by hooking it from the lower side to the lower frame 3C. As Figure 10 shown, as a result, the main backing plate 2A is integrally fixed to the backrest frame 3 in a state where the gap (division line L) in the seat width direction between the main backing plate 2A and each side backing plate 2B is blocked.

[0072] As Figure 12 shown, when the hook member A22 of the lower end of the main cover A2 is hooked to the lower frame 3C, the hook member A22 first passes through a lower hook hole 4C formed at the lower end portion of the cloth-like member 4. Thus, along with the fixation of the lower end of the main cover A2 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.

[0073] Thus, the cloth-like member 4 is also wound and hung from the lower side to the lower frame 3C together with the main cover A2 and the main cushion A1. Through the above assembly, the upper part of the main backing plate 2A is supported from the seat back side by the upper frame 3B (refer to Figure 7 ). In addition, the area of the main backing plate 2A from its middle part to the lower part is elastically supported from the seat back side by the lumbar support member 3D.

[0074] Moreover, the main backing plate 2A is supported in a planar shape from the seat back side by the cloth-like member 4 stretched on the backrest frame 3 (refer to Figures 12 to 15 ). Through this support, the main backing plate 2A can support the body of the seated person from the seat back side with an appropriate sense of hardness.

[0075] Moreover, even when a yaw-direction load is input to the back of the seated person during a vehicle turn, since both side portions of the main backing plate 2A are supported from the seat back side by the cloth-like member 4, it is not likely to sink toward the seat back side. With such a structure, even if the main backing plate 2A is separated from each side backing plate 2B, it can support the body of the seated person so as not to sway easily in the yaw direction during a vehicle turn.

[0076] As Figures 13 to 15 shown, the cloth-like member 4 is arranged to extend across the division line L between the main backing plate 2A and each side backing plate 2B in the seat width direction. Thus, it is possible to prevent foreign objects from entering the seat interior through the gap between the main backing plate 2A and each side backing plate 2B by the cloth-like member 4.

[0077] Substantially the entire area of each side backing plate 2B in the seat height direction is supported from the seat back side by each side frame 3A. Each side backing plate 2B has a structure in which these side base materials B3 support the side cushion B1 in a planar shape from the outer obliquely back side of the seat. Thus, each side backing plate 2B can appropriately support the back of the seated person from both left and right outer sides.

[0078] Specifically, the side base material B3 of each side pad 2B supports the side pad B1 in a planar shape from the oblique outer side of the seat back through the face portion extending obliquely so as to cover each side frame 3A from the front side and the inner side in the seat width direction. With these structures, each side pad 2B has a structure that is less likely to sink toward the seat back side than the main pad 2A.

[0079] like Figure 11 As shown in FIG. 1 , the main base material A3 of the main pad 2A is formed into a frame-like shape in front view. Specifically, the main base material A3 is formed into a ladder shape in which the left and right frame side parts A32 are connected at multiple locations in the seat height direction.

[0080] The left and right frame side portions A32 of the main base material A3 are formed with first lateral bulging portions A33 bulging toward the front of the seat in the lower regions thereof. These first lateral bulging portions A33 are formed at positions where their arrangement in the seat height direction overlaps with the pelvis supporting portion R of the main pad 2A, i.e., the portion supporting the pelvis of the seated person. Here, each first lateral bulging portion A33 corresponds to the "lateral bulging portion" of the present invention.

[0081] like Figure 13 As shown in the figure, specifically, each first lateral bulge A33 is formed in a shape that is pushed out from the left and right frame side portions A32 of the main base material A3 to form an inclined surface M that faces obliquely inward as it approaches the front of the seat. The main pad A1 has recessed portions A11 formed on the left and right side portions of the pad back surface that are recessed corresponding to the shape of each first lateral bulge A33 protruding from these main base materials A3.

[0082] Thus, each first lateral bulge A33 is formed into a shape that bulges into each recess A11 of the main pad A1. Due to the bulging of these first lateral bulges A33, 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 supported more rigidly from the seat back side by each first lateral bulge A33.

[0083] Specifically, each first lateral bulge A33 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 pelvis of the seated person in a planar manner from both the left and right outer sides through the inclined surface M of each first lateral bulge A33 of the main base material A3.

[0084] With these supports, even if a load in the yaw direction is input from the pelvis of the seat occupant when the vehicle turns, the main pad 2A is strongly supported on both sides by the first lateral bulges A33 from the seat back side, and is not easily sunk toward the seat back side. With such a structure, even if the main pad 2A is separated from the side pads 2B, the body of the seat occupant can be supported so as not to shake in the yaw direction when the vehicle turns.

[0085] Specifically, each first side bulging portion A33 is formed on the main base material A3 fixed to the backrest frame 3. Thus, by means of each first side bulging portion A33 of the main base material A3 supported by the backrest frame 3, it is possible to further appropriately reduce the swaying of the seated person in the yaw direction.

[0086] As Figure 11 shown, the regions of the left and right frame side portions A32 of the main base material A3 near the upper part of the seat are supported in a planar manner from the back side of the seat by the extending portions B32 extending inward in the seat width direction from the respective side base materials B3. These extending portions B32 are formed at positions above the pelvis support portion R of the main cushion 2A.

[0087] As Figure 14 shown, specifically, each extending portion B32 is configured to extend in a flat plate shape from the outer side in the seat width direction toward the inner side across the dividing line L between the main cushion 2A and the respective side cushions 2B. Specifically, each extending portion B32 extends inward to a position where its arrangement in the seat width direction overlaps with the lumbar support member 3D that supports the main cushion 2A from the back side of the cushion.

[0088] Thus, each extending portion B32 is arranged in such a way as to be sandwiched between the main cushion 2A and the lumbar support member 3D. Through the support of these extending portions B32 from the back side of the seat, the left and right side portions of the main cushion 2A can support the back of the seated person more rigidly from the back side of the seat.

[0089] Thus, even when a load in the yaw direction is input from the pelvis of the seated person to the main cushion 2A during a vehicle turn, its two side portions are strongly supported by the respective extending portions B32 from the back side of the seat, so that it is not easy to sink toward the back side of the seat. Thus, even when the main cushion 2A is separated from the respective side cushions 2B, it can support the body of the seated person so as not to be easily swayed in the yaw direction during a vehicle turn.

[0090] The left and right frame side portions A32 of the main base material A3 supported by the respective extending portions B32 from the back side of the seat are covered from the back side of the seat by a base material covering portion A21 that is a part of the end of the cover pulled into the back side of the seat of the main cover A2. In this way, by interposing the base material covering portion A21 between the main base material A3 and the respective extending portions B32, it is possible to reasonably prevent direct contact between the main base material A3 and the respective extending portions B32. As a result, it is possible to appropriately suppress the generation of abnormal noises accompanying the collision of resins with each other. In addition, in Figures 7 to 8 , for the sake of easily understanding the structure of the main base material A3, the illustration of the base material covering portion A21 is omitted.

[0091] 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.

[0092] like Figure 11 As shown, on the left and right frame side portions A32 of the main base material A3, a second lateral bulge A34 bulging toward the front of the seat is formed in the middle area in the seat height direction between the first lateral bulge A33 and the extension portion B32. Here, each second lateral bulge A34 is equivalent to the "lateral bulge" of the present invention.

[0093] like Figure 15 As shown, each second side bulge A34 is formed in a shape that is pushed out from the left and right frame side portions A32 of the main base material A3 to form an inclined surface M that faces obliquely inward as it approaches the front of the seat. The main pad A1 has recessed portions A11 formed on the left and right side portions of the pad back surface that are recessed in accordance with the shape of each second side bulge A34 protruding from the main base material A3.

[0094] Thus, each second lateral bulge A34 is shaped to bulge into each recess A11 of the main pad A1. Due to the bulging of the second lateral bulge A34, the main pad A1 of the main pad 2A is thinner at both sides than at the center, and can support the back of the seat occupant more rigidly from the seat back side.

[0095] Specifically, each second lateral bulge A34 is configured such that its inclined surface M supports the main pad A1 in a planar manner from the oblique 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 through the inclined surface M of each second lateral bulge A34 of the main base material A3.

[0096] 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 lateral bulges A34 from the seat back side, so that it is not easy 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 so that it is not easy to shake in the yaw direction when the vehicle turns.

[0097] Specifically, each second lateral bulge A34 is formed on the main base material A3 fixed to the back frame 3. Thus, the second lateral bulge A34 of the main base material A3 supported by the back frame 3 can further appropriately reduce the shaking of the seated person in the yaw direction.

[0098] As described above, the seat S according to the present embodiment is configured as follows. In addition, the reference numerals in parentheses below are the reference numerals corresponding to the respective structures shown in the above embodiment.

[0099] 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 constitutes the central portion in the seat width direction and side cushion plates (2B) that constitute the side portions in the seat width direction. The main cushion plate (2A) has a main cushion (A1) that constitutes the seat padding and a main base material (A3) that abuts against the back surface of the padding of the main cushion (A1).

[0100] The main base material (A3) has a pair of side bulging portions (A33, A34) in the seat width direction, and the pair of side bulging portions (A33, A34) in the seat width direction bulge into a pair of recesses (A11) formed in the side portions in the seat width direction on the back surface of the padding of the main cushion (A1). According to the above structure, through the pair of side bulging portions (A33, A34) of the main base material (A3), the side portions of the main cushion (A1) can be supported more strongly from the back side of the seat than the central portion. As a result, even if the main cushion plate (2A) is separated from the side cushion plates (2B), the swaying of the seated person in the yaw direction can be reduced.

[0101] In addition, a pair of side bulging portions (A33) are provided at a position where the configuration in the seat height direction overlaps with the pelvis support portion (R) of the main cushion plate (2A) that supports the pelvis of the seated person in the seat backrest (1). According to the above structure, through the pair of side bulging portions (A33) of the main base material (A3), the rotation of the pelvis of the seated person in the yaw direction can be suppressed. As a result, the swaying of the seated person in the yaw direction can be reduced more appropriately.

[0102] In addition, the main base material (A3) is fixed to the seat frame (3). According to the above structure, through the pair of side bulging portions (A33, A34) of the main base material (A3) supported by the seat frame (3), the swaying of the seated person in the yaw direction can be further appropriately reduced.

[0103] In addition, the pair of side bulging portions (A33, A34) have inclined surfaces (M), and the inclined surfaces (M) are inclined so as to support the main cushion (A1) in a planar manner from the outer side obliquely from the back of the seat in the corresponding pair of recesses (A11). According to the above structure, through the pair of side protruding portions (A33, A34) of the main base material (A3), the seated person can also be appropriately supported laterally. As a result, the swaying of the seated person in the yaw direction can be further appropriately reduced.

[0104] 《Regarding Other Embodiments》

[0105] As described above, one embodiment of the present invention has been described, but the present invention can be implemented in various ways in addition to the above-described embodiment.

[0106] 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, the seat can be provided in various facilities (for non-transportation means) such as sports facilities, theaters, concert halls, and event venues. The structure of the present invention can be applied to the seat cushion in addition to the seat backrest.

[0107] 2. The bulging shape of the pair of side bulging portions provided on the main base material can be constituted by a shape that is pushed out in a cylindrical shape toward the front of the seat, in addition to a shape that is pushed out so as to form an inclined surface that slopes inward obliquely as it approaches the front of the seat.

[0108] When the structure of the present invention is applied to a seat cushion, it is preferable that the pair of side bulging portions provided on the main base material are provided at positions that overlap with the ischial support portions of the main cushion that support the left and right ischiums of the seated person in the front-rear direction of the seat. With this configuration, it is possible to appropriately suppress the rotation of the left and right ischiums of the seated person in the yaw direction by the pair of side bulging portions.

[0109] 3. The main cover and / or the side cover can be made of a leather material in addition to a fabric.

[0110] Description of Reference Numerals

[0111] 1 Seat backrest

[0112] 2 Seat cushion body

[0113] 2A Main cushion

[0114] A1 Main padding

[0115] A11 Recess

[0116] A2 Main cover

[0117] A21 Base material covering portion

[0118] A22 Hanging member

[0119] A3 Main base material

[0120] A32 Frame side portion

[0121] A33 First side bulging portion (side bulging portion)

[0122] A34 Second side bulging portion (side bulging portion)

[0123] A4 Upper hanging hole

[0124] 2B side backing plate

[0125] B1 side gasket

[0126] B2 side cover

[0127] B3 side base material

[0128] B31 fitting projection

[0129] B32 extension part

[0130] 3 backrest frame (seat frame)

[0131] 3A side frame

[0132] A5 side edge

[0133] 3B upper frame

[0134] B5 headrest support bracket

[0135] B6 fitting hole

[0136] 3C lower frame

[0137] 3D lumbar support

[0138] 3E bracket

[0139] E1 hooking claw

[0140] 4 cloth-like part

[0141] 4A upper hooking hole

[0142] 4B side hooking hole

[0143] 4C lower hooking hole

[0144] L dividing line

[0145] M inclined surface

[0146] R pelvis support part

[0147] S seat

[0148] H headrest.

Claims

1. A seat comprising a seat cushion body elastically supporting a seated person and a seat frame supporting the seat cushion body from a seat back side, The seat cushion body is composed of three divided elements, namely, 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. The main base material has a pair of lateral bulging portions in the seat width direction, and the pair of lateral bulging portions in the seat width direction bulge so as to enter a pair of recessed portions in the seat width direction formed on both side portions of the pad back surface of the main pad in the seat width direction.

2. The seat according to claim 1, wherein: A pair of the side bulges are arranged at positions where the pelvic support portion of the main pad that supports the pelvis of the seat occupant in the seat back is overlapped in the seat height direction, or where the ischium support portion of the main pad that supports the left and right ischiums of the seat occupant in the seat cushion is overlapped in the seat front-rear direction.

3. The seat according to claim 1 or 2, wherein: The main substrate is fixed to the seat frame.

4. The seat according to claim 1 or 2, wherein: The pair of side bulging portions has an inclined surface, and the inclined surface is inclined so as to support the main pad in a planar shape from the outer side of the seat back in the corresponding pair of recessed portions.

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