Seat

Abstract

A seat (1) is provided with a seat cushion body (20) that elastically supports a seated person, and a seat cushion frame that supports the seat cushion body (20) from the seat back side. The cushion body (20) is provided with three divided elements which are divided into a main cushion plate (21) constituting the center portion in the seat width direction and side cushion plates (22) constituting both side portions in the seat width direction. The main backing plate (21) has a main backing plate pad (21A) including a pad main body (A11) and a pad reinforcing portion (A12). The pad main body (A11) is composed of a polyurethane foam molded body. The pad reinforcing section (A12) is provided along both edges of the pad main body (A11) on the seat back side. The pad reinforcing section (A12) is configured from a bead foam molded body that is harder than the pad main body (A11).

Description

Technical Field

[0001] One aspect of the present disclosure relates to a seat. Specifically, the present invention 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 a back side. Background Art

[0002] The vehicle seat disclosed in Japanese Patent Application Publication No. 2020-33005 (Patent No. 005) has a seat cushion body composed of a seat pad and a seat cover. Moreover, the seat cushion body is divided into three parts in the seat width direction. Specifically, the seat cushion body is a structure divided into three parts, including a main cushion plate constituting a central part in the seat width direction and side cushion plates constituting two side parts in the seat width direction. The main cushion plate and the side cushion plates are separately assembled and fixed to the seat frame. Summary of the invention Technical problem to be solved by the invention

[0003] In the structure described in Publication No. 005, the main pad is separated from each side pad. Therefore, when the vehicle is subjected to lateral acceleration, there is a problem that the main pad is prone to sway. Therefore, there is a need for a seat that can appropriately suppress the sway of each side pad and the separated main pad. Means for solving technical problems

[0004] One embodiment of the present disclosure is a seat having: a cushion body that elastically supports a seated person; and a seat frame that supports the cushion body from the back of the seat. The cushion body has three divided elements divided into a main cushion plate that constitutes a central portion in the seat width direction and side cushion plates that constitute both side portions in the seat width direction. The main cushion plate includes a cushion body composed of a polyurethane foam molded body and a cushion reinforcement portion. The cushion reinforcement portion is composed of a bead foam molded body that is harder than the cushion body, and is provided along both edges of the cushion body on the back of the seat.

[0005] Therefore, the pad reinforcement portion can improve the rigidity of both edge portions on the pad back side of the main pad, and as a result, the main pad can be made less likely to roll with respect to lateral acceleration.

[0006] According to another aspect of the present disclosure, the main pad has a non-reinforced portion where the pad reinforcement portion is not provided, at a central portion of the pad body on the seat back side, that is, at a central portion of the pad back side.

[0007] Therefore, the non-reinforced portion does not impair the cushioning properties of the main pad, and the roll of the main pad can be appropriately suppressed.

[0008] According to another aspect of the present disclosure, the seat frame includes two side frames and a pair of reinforcement frames mounted on the two side frames. The pad reinforcement portion extends continuously across the pair of reinforcement frames and abuts against the pair of reinforcement frames from the seat front side.

[0009] Therefore, the rigidity of both edge portions of the pad back side of the main pad can be further appropriately improved. In addition, the main pad can be made less likely to shift laterally relative to the seat frame. As a result, the lateral movement of the main pad can be more appropriately suppressed.

[0010] According to another embodiment of the present disclosure, the cushion reinforcement portion includes: side edges extending along both edges of the cushion body on the seat back side; and a connecting edge extending in the seat width direction so as to connect the side edges. The connecting edge extends along one of the pair of reinforcement frames and abuts against the one from the seat front side.

[0011] Therefore, the pad reinforcement portion becomes a continuous structure in which the side portions are connected by the connecting side portions. As a result, the rigidity of the two edge portions on the back side of the pad of the main pad can be more appropriately improved. Thus, the lateral movement of the main pad can be more appropriately suppressed.

[0012] According to other embodiments of the present disclosure, the seat frame is configured as a frame constituting a seat cushion, and the seat cushion is provided with a tilting mechanism capable of adjusting the seat surface angle of the front edge of the seat. The main pad has a main pad cover covering the pad body. The main pad has a front portion of the pad body that moves by adjusting the seat surface angle and a support component provided on the seat back side of the front portion. The support component is not connected to the pad reinforcement portion. The end of the main pad cover is fixed to the support component. The support component is fixed to the movable portion of the tilting mechanism.

[0013] Therefore, the pad reinforcement part can be appropriately provided on the main pad of the seat cushion in a manner that does not hinder the movement of the tilting mechanism. In addition, the end of the main pad cover and the main pad to the movable part of the tilting mechanism can be appropriately fixed by the support member provided on the front part of the back side of the pad. In addition, the support member can be fixed to the movable part of the tilting mechanism directly or indirectly.

[0014] According to another aspect of the present disclosure, the bead-molded body constituting the cushion reinforcement portion includes foamed polypropylene.

[0015] Therefore, by forming the pad reinforcement portion from a bead foam molded body including foamed polypropylene, the main pad can be formed so as to be able to exhibit appropriate cushioning properties and a roll suppression effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a perspective view showing a schematic structure of a seat according to the first embodiment. Figure 2 A side view of a seat cushion. Figure 3 A top view of the seat cushion. Figure 4 This is an exploded perspective view of the seat cushion body removed from the seat cushion frame. Figure 5 A top view of the cushion frame. Figure 6 It is a bottom view of the cushion body. Figure 7 yes Figure 3 VII-VII line cross-sectional view. Figure 8 yes Figure 3 Cross-sectional view along line VIII-VIII. Fig. 9 yes Figure 8 Enlarged view of section IX. Fig.10 yes Figure 3 XX line cross-sectional view. Fig.11 It is a perspective view showing a state before one side pad is assembled to the side frame. Fig.12 This is a perspective view showing a state in which one side pad is assembled to the side frame. Fig.13 yes Fig.12 Cross-sectional view along line XIII-XIII. DETAILED DESCRIPTION

[0017] 《First Implementation Mode》 (Schematic Structure of Seat 1) use Figure 1 to Figure 13 The structure of the seat 1 according to the first embodiment will be described. In the following description, each direction of front, back, up, down, left, and right is shown in each figure. The direction marked with "seat" refers to the direction based on the orientation of the seat 1. In the following description, when a specific reference figure is not shown or when there is no corresponding reference number in the reference figure, a reference shall be made to the reference figure as appropriate. Figure 1 to Figure 13 Any graph in .

[0018] like Figure 1 As shown, the seat 1 according to the present embodiment is configured as a right seat for a single person installed on the floor of a vehicle. The seat 1 includes a seat back 2 constituting a backrest of a seated person, a seat cushion 3 constituting a seat portion, and a headrest 4 constituting a headrest portion.

[0019] like Figure 2As shown, the seat cushion 3 is provided with a tilting mechanism M capable of adjusting the angle of the seat surface at the front of the seat. Figure 3~Figure 4 As shown, the seat cushion 3 has a metal cushion frame 10 and a cushion body 20 constituting its frame. The cushion body 20 is assembled to the upper part of the cushion frame 10 to elastically support the buttocks and thighs of the seated person. The cushion frame 10 is equivalent to one of the "seat frames".

[0020] like Figure 4 As shown, the seat cushion body 20 is composed of three divided elements, namely, a main pad 21 constituting the central portion in the seat width direction and side pads 22 constituting the two side portions in the seat width direction. The main pad 21 supports the buttocks and thighs of the seated person from below. The main pad 21 is formed in a substantially flat surface shape facing upward from the seat. The upper surface of the main pad 21, which is the seat front side, is slightly higher in the front and lower in the rear.

[0021] like Figure 1 As shown, each side bolster 22 supports the buttocks and thighs of the seated person from the obliquely downward and outward. Each side bolster 22 has an upper surface that becomes the surface of the seat front side. The upper surface stands obliquely toward the outer side in the seat width direction.

[0022] like Figure 4 As shown, the main pad 21 and the side pads 22 are configured to be individually assembled to the seat cushion frame 10 only by accessing from above. Thus, the main pad 21 and the side pads 22 can be easily attached and detached from the seat cushion frame 10 without removing the seat 1 from the state set on the floor.

[0023] (Structure of seat cushion 3) The specific structure of each part of the seat cushion 3 is described below. Figure 4~Figure 5 As shown in the figure, the cushion frame 10 has a pair of left and right lower arms 11 extending in the front-rear direction along the left and right side portions of the seat cushion 3. In addition, the cushion frame 10 has a tilting plate 12 extending in a planar shape across the front end portions of the lower arms 11. In addition, the cushion frame 10 has a pair of left and right tilting arms 12A extending from the left and right side edges of the tilting plate 12 toward the rear of the seat.

[0024] The rear end of each tilting arm 12A is rotatably connected to the middle part of each corresponding lower arm 11 via a tilting rotation shaft 12B extending in the seat width direction. Each tilting arm 12A is tilted in the vertical direction around each tilting rotation shaft 12B by a drive unit (not shown) assembled to the seat cushion frame 10.

[0025] By tilting the tilting arms 12A in the up-down direction, the tilting plates 12 move up-down relative to the lower arms 11, and the angle of the tilting plates 12 changes. As a result, the seat surface angle of the front portion of the seat cushion 3 is adjusted. The tilting mechanism M described above is constituted by a mechanism that enables the angle of the tilting plates 12 to be adjusted relative to the lower arms 11. The tilting plates 12 correspond to the "movable portion".

[0026] The seat cushion frame 10 also has a front pipe 13 and a rear pipe 14. The front pipe 13 is a round pipe and is mounted between the front parts of the lower arms 11. The front pipe 13 is located at the rear lower side of the tilting plate 12. The rear pipe 14 is a round pipe and is mounted between the rear parts of the lower arms 11. The front pipe 13 and the rear pipe 14 are respectively equivalent to "reinforcement frames".

[0027] like Figures 4 to 5 As shown, a plurality of (for example, four) support springs 15 are provided between the front tube 13 and the rear tube 14. The support springs 15 are curved in a wave shape in the front-rear direction and the left-right direction (seat width direction). The support springs 15 elastically support the main pad 21 of the cushion body 20 from below.

[0028] like Figure 4 As shown, each tilting arm 12A has an arm shape with a cross section in the shape of an inverted L. The tilting arm 12A has a side plate portion covering the inner side surface of the lower arm 11 and a top plate portion covering the upper surface of the lower arm 11. A plate-shaped fastening bracket Ab extending obliquely downward toward the inner side in the seat width direction is welded to the lower portion of the side plate portion of the tilting arm 12A.

[0029] like Figure 4~Figure 5 As shown, each fastening bracket Ab is arranged at a position lower and rearward than the front tube 13. Specifically, each fastening bracket Ab is arranged at a position lower than the support spring 15. Each fastening bracket Ab has an upper surface (overlapping surface) facing obliquely inward and upward. The upper surface faces the installation space of the main pad 21. Fig.13 As shown in FIG. 1 , the fastening bracket Ab is located directly below the inner side portion of the side pad 22. A side pad resin component 22C is provided on the seat back side of the side pad 22. Fig.11 As shown in FIG. 1 , the fastening portion C24 extends from the side pad resin member 22C. The fastening portion C24 is fastened to the fastening bracket Ab via the fastening structure T.

[0030] like Fig.11 As shown in FIG. 1 , a keyhole-shaped engaging hole Ah extending in the front-rear direction of the seat is formed in the top plate portion of each tilting arm 12A. Engaging claws C22 formed on the corresponding side pads 22 engage with these engaging holes Ah. Specifically, the engaging claws C22 are formed on the side pad resin member 22C provided on the seat back side of each side pad 22. The engaging claws C22 are inserted into the engaging holes Ah from above and slide toward the rear of the seat, whereby the engaging claws C22 are hooked on the periphery of the engaging holes Ah.

[0031] (Structure of the main pad 21) like Figure 4 , Figure 6~Figure 8 As shown, the main pad 21 has a main pad liner 21A as a cushion portion, a main pad cover 21B, and a main pad resin component 21C. The main pad cover 21B is made of fabric and covers the main pad liner 21A. The main pad resin component 21C is provided at the pad back front portion of the main pad liner 21A. The main pad resin component 21C is equivalent to one of the "support components".

[0032] like Figure 6~Figure 8 As shown, the main pad 21A has a pad body A11 made of a polyurethane foam molding and a pad reinforcement A12 made of a bead foam molding of foamed polypropylene. For example, the pad reinforcement A12 is formed into a U-shaped shape when viewed from above. The pad reinforcement A12 is set in a foam molding mold of the pad body A11. Thus, the pad reinforcement A12 is integrated with the pad body A11.

[0033] like Figure 5 As shown, the pad reinforcement portion A12 is U-shaped when viewed from above, and has left and right side portions As and a connecting side portion Ac. Figure 7~Figure 8 As shown, the side portion As extends in the front-rear direction of the seat along the left and right edges (the two edges on the back of the cushion) of the cushion body A11 on the seat back side. The connecting side portion Ac extends in the seat width direction in a manner that the rear ends of each side portion As are connected to each other. The cushion reinforcement portion A12 is harder than the cushion body A11. The cushion reinforcement portion A12 is arranged below the left and right edges and the rear edge of the cushion body A11. Therefore, the cushion reinforcement portion A12 does not impair the cushioning property of the main pad 21. Moreover, the cushion reinforcement portion A12 serves to appropriately suppress the lateral swing of the main pad 21.

[0034] like Figure 4 As shown, the main cushion plate 21 is disposed on the cushion frame 10. Figure 8 As shown, the front portion of each side portion As of the pad reinforcement portion A12 is supported from below by the front pipe 13. The rear portion of each side portion As is supported by the rear pipe 14.

[0035] like Figure 8 As shown, the connecting edge Ac of the pad reinforcement portion A12 extends along the rear pipe 14 and is supported from below by the rear pipe 14. When the load of the seat occupant is applied to the main pad 21, the front portion of each side edge As is supported by the front pipe 13, and the rear portion of each side edge As and the connecting edge Ac are supported by the rear pipe 14. The connecting edge Ac is supported by the rear pipe 14 from below the seat over a wide range in the seat width direction.

[0036] Through these supports, the pad reinforcement portion A12 can appropriately suppress the lateral movement of the main pad 21 when the vehicle is subjected to lateral acceleration. Figure 8 The pad reinforcement portion A12 is not located above or in contact with the tilting plate 12. That is, the pad reinforcement portion A12 is not provided in the front region of the main pad pad 21A, but is provided from the middle portion of the main pad pad 21A in the seat front-rear direction to the rear portion.

[0037] As described above, the pad reinforcement portion A12 is U-shaped in a plan view. As a result, the central portion of the seat back side of the pad body A11 (central portion of the pad back side) is not reinforced by the pad reinforcement portion A12 (non-reinforced portion NR). That is, the main pad pad 21A has the non-reinforced portion NR in the central portion of the pad back side. The pad reinforcement portions A12 are provided at both edge portions and the rear edge portion of the pad back side of the main pad pad 21A. Therefore, the main pad pad 21A can appropriately suppress the roll without impairing the cushioning performance.

[0038] The main pad cover 21B covers the main pad 21A from above the seat. Figure 6 , the front, rear, left, and right peripheral edges of the main pad cover 21B are pulled into the seat back side surface of the main pad pad 21A, that is, the pad back side, and fixed. Specifically, with respect to the main pad cover 21B, from the middle portion in the seat front-back direction where the pad reinforcement portion A12 of the main pad pad 21A is provided to the rear portion, the left and right ends of the main pad cover 21B pulled into the pad back side are hooked and fixed. The rear end of the main pad cover 21B pulled into the pad back side is connected to the pad back side of the main pad pad 21A by a Velcro tape (not shown).

[0039] like Figure 6 As shown in FIG. 1 , a main pad resin member 21C having a U-shape in a plan view is provided on the pad back side of the main pad pad 21A. The main pad cover 21B is pulled into the front part of the main pad pad 21A, and the ends on the left and right sides and the front side of the pad back side are hooked and fixed on the main pad resin member 21C. By the above hooking, the main pad cover 21B is stretched over the entire outer surface of the main pad pad 21A. In addition, the main pad resin member 21C is fixed in a state of being pressed against the pad back side of the main pad pad 21A by hooks at each end of the main pad cover 21B.

[0040] The main pad resin component 21C is formed of an injection molded product. The main pad resin component 21C is provided at the pad back front portion which is closer to the front side than the area where the pad reinforcement portion A12 is provided of the main pad pad 21A. Specifically, the main pad resin component 21C is provided in a U-shaped shape when viewed from above and extends along the left and right edges and the front edge of the pad back front portion of the main pad pad 21A.

[0041] The main pad resin member 21C has cover hooks C11 formed on the front side and left and right sides extending in a U-shape when viewed from above. The ends of the main pad cover 21B, which are pulled into the back of the pad, are fixed to the cover hooks C11. The left and right edges of the front side of the main pad resin member 21C are provided with fitting claws C12 consisting of elastic claws protruding toward the lower side of the seat.

[0042] The main pad 21 is arranged on the cushion frame 10 from above the seat. Figure 8~Figure 9 As shown in the figure, each engaging claw portion C12 of the main pad plate resin member 21C is engaged with the engaged portion C25 of the side pad plate 22 by snap-fitting in a manner of being pressed from above the seat. The side pad plate 22 has a side pad plate resin member 22C assembled to the tilting plate 12. The engaging claw portion C12 is formed on the inner side of the front end of the side pad plate resin member 22C. Thus, the front end portion of the main pad plate 21 is engaged with the seat cushion frame 10 via each side pad plate 22 so as not to be separated upward.

[0043] Reference Fig. 9 The engaging claw portion C12 is constructed so that, from the above-mentioned snap-fit ​​engaged state, the operator applies force by pulling up the front end of the main pad 21 from under the seat, thereby easily disengaging from the engaged state with the engaged portion C25 of each side pad 22.

[0044] like Figure 8 As shown, the main pad 21 is assembled to the cushion frame 10 in the following manner. First, the rear portion of the main pad 21 is inserted and set on the rear pipe 14 in a manner that it is inserted into the lower side of the seat back 2 from the front of the seat. Next, the front portion of the main pad 21 is placed on the tilting plate 12 with the rear portion of the main pad 21 as a fulcrum.

[0045] Thus, the engaging claws C12 formed at both edges of the front plate portion of the main pad resin member 21C are engaged with the engaged portions C25 at the inner front end portions of the side pads 22 by snap fit (see FIG. Fig. 9 ). In this way, the main pad 21 is assembled to the seat cushion frame 10 in a detachable manner only by the two states of abutment from above the seat and engagement of the respective engagement claws C12 at the front end.

[0046] (Structure of each side pad 22) Reference Figure 4 , Figure 6 as well as Fig.10Each side pad 22 includes a side pad liner 22A as a seat cushion portion, a side pad cover 22B, and a side pad resin component 22C. The side pad cover 22B is made of fabric and covers the side pad liner 22A. The side pad resin component 22C is provided on the pad back side of the side pad liner 22A. Each side pad 22 has a bilaterally symmetrical structure having the same basic structure.

[0047] like Fig.10 As shown, the side pad liner 22A is made of a polyurethane foam molding. The side pad liner 22A has a dam-shaped protrusion on the seat front side, that is, the pad surface. Specifically, the pad surface rises in a manner that bulges obliquely from the inner side to the outer side in the seat width direction toward the upper side of the seat. The pad back surface of the side pad liner 22A is concave along the dam-shaped protrusion on the pad surface. That is, the pad back surface is formed into a concave curved surface shape in which the back surface is hollowed out.

[0048] like Fig.10 As shown in FIG. 1 , the side bolster cover 22B covers the side bolster pad 22A from above the seat. The peripheral edges of the side bolster cover 22B in the front, rear, left, and right directions are pulled into the back of the pad of the side bolster pad 22A and fixed. Specifically, as shown in FIG. Figure 6 As shown, the left and right and front and rear ends of the side shim cover 22B are pulled into the back of the side shim pad 22A. And, the ends of the side shim cover 22B are hooked and fixed to the side shim resin member 22C provided along the back of the side shim pad 22A.

[0049] Thus, the side pad cover 22B is stretched over the entire outer surface of the side pad liner 22A. The side pad resin member 22C is hooked on each end of the side pad cover 22B and fixed in a state pressed against the pad back surface of the side pad liner 22A.

[0050] like Figure 6 and Fig.10 As shown, the side pad resin member 22C is an injection molded product in the shape of a curved plate. The side pad resin member 22C has a shape that matches the concave curved surface of the pad back of the side pad liner 22A. The side pad resin member 22C has a side support portion C26 that extends obliquely along the dam-shaped protrusion of the side pad liner 22A. Therefore, the side support portion C26 supports the dam-shaped protrusion of the side pad liner 22A in a planar manner from the back side. As a result, the side pad liner 22A appropriately supports the side of the body of the seated person.

[0051] like Figure 6 and Fig.10As shown in FIG. 1 , a cover hook C21 is formed at the peripheral edge of the side pad resin member 22C. The ends of the side pad cover 22B that are pulled into the front end of the back of the pad are fixed to the cover hook C21. Figure 6 As shown, a hook-shaped engaging claw C22 is formed in a substantially central region of the side pad resin member 22C. The engaging claw C22 protrudes downward from the concave upper region of the side pad resin member 22C. Fig.11 ), the engaging claw C22 is inserted from above into the engaging hole Ah formed in the top plate portion of the tilting arm 12A.

[0052] Next, the side bolster 22 slides rearward relative to the cushion frame 10, whereby the engagement claws C22 are hooked on the engagement holes Ah from the front. By this hooking, the side bolster 22 is fixed to the tilt arm 12A so as not to fall off above the seat.

[0053] like Figure 6 As shown in FIG. 1 , a guide portion C23 is formed on the lower surface of the side pad resin member 22C. The guide portion C23 is located in the upper region of the concave curve of the side pad resin member 22C. The guide portion C23 has an L-shaped cross section and has a substantially horizontal portion and a protruding portion protruding downward from the horizontal portion. By assembling the side pad 22 from above to the seat cushion frame 10 (see FIG. 1 ), the side pad 22 is Fig.11 ), the horizontal portion of the guide portion C23 abuts against the upper surface of the top plate portion of the tilting arm 12A. The protruding portion of the guide portion C23 abuts against the outer edge of the top plate portion of the tilting arm 12A. Thus, the guide portion C23 restricts the assembly position of the side pad 22 relative to the seat width direction of the cushion frame 10.

[0054] like Figure 11~Figure 13 As shown in FIG. 1 , a plate-shaped fastening portion C24 is formed in the middle portion of the side bolster resin member 22C in the seat front-rear direction. The fastening portion C24 extends obliquely downward from the inner edge of the side bolster resin member 22C in the width direction toward the inner side in the width direction. The fastening portion C24 overlaps with the upper surface of the fastening bracket Ab by assembling the side bolster 22 to the seat cushion frame 10.

[0055] Next, if Fig.13 As shown, a bolt T1, which is an insertion-type fastening structure T, is inserted into the fastening portion C24 and the fastening bracket Ab using a fastening tool D (impactor) for fastening. Thus, the fastening portion C24 is fastened to the fastening bracket Ab.

[0056] Specifically, if Fig.13As shown, the fastening structure T is composed of the bolt T1 and the weld nut T2 welded to the lower surface (the surface on the back side of the upper surface) of the fastening bracket Ab. The head T1h of the bolt T1 is provided as a tool engaging portion on the fastening tool D. The leg of the bolt T1 is inserted into the fastening portion C24 and the fastening bracket Ab overlapping therewith by the fastening tool D and fastened to the weld nut T2.

[0057] The upper surface of the fastening bracket Ab and the fastening portion C24 overlapping therewith faces the installation space of the main pad 21, that is, the opening portion SP. Therefore, the fastening operation of the bolt T1 using the fastening tool D uses the opening portion SP as a working space, and can easily approach the fastening portion. More specifically, the fastening operation can be performed by obliquely inserting only the front end of the fastening tool D into the fastening portion without dropping the entire fastening tool D into the opening portion SP.

[0058] In this structure, the support spring 15 is assembled to the seat cushion frame 10 in parallel beside the above-mentioned fastening portion. Even with this structure, the above-mentioned fastening operation can be performed without interfering the fastening tool D with the support spring 15. Through the above-mentioned fastening, the head T1h (tool engaging portion) of the bolt T1 is set with the upper surface facing the opening SP, which is the installation space of the main pad 21. Therefore, when the bolt T1 is removed from the fastened state, the fastening tool D can also be inserted obliquely from the above-mentioned opening SP, and the bolt T1 can be easily loosened.

[0059] (Assembly method of seat cushion 3) Next, a method for assembling the cushion body 20 to the cushion frame 10 will be described. Figure 11~Figure 13 As shown, before the main pad 21 is assembled to the seat cushion frame 10 , each side pad 22 is assembled to the seat cushion frame 10 (side pad assembly step). The method of assembling each side pad 22 to the seat cushion frame 10 is as described above.

[0060] Next, the main pad 21 is assembled to the cushion frame 10 (main pad assembly step). Through the above steps, the cushion body 20 composed of three divided elements can be easily and appropriately assembled to the cushion frame 10. The step of removing the cushion body 20 from the cushion frame 10 is the opposite step to the above.

[0061] In summary, the seat 1 of the present embodiment has the following structure. That is, the seat 1 includes a seat cushion body 20 that elastically supports a seated person and a seat frame (seat cushion frame 10) that supports the seat cushion body 20 from the seat back side. The seat cushion body 20 is composed of three divided elements, namely, a main pad 21 that constitutes a central portion in the seat width direction and side pads 22 that constitute both side portions in the seat width direction.

[0062] The main pad 21 has a main pad pad 21A including a pad body A11 and a pad reinforcement A12. The pad body A11 is made of a polyurethane foam molded body. The pad reinforcement A12 is provided along both edges of the pad body A11 on the seat back side, i.e., both edges of the pad seat back side. The pad reinforcement A12 is made of a bead foam molded body that is harder than the pad body A11.

[0063] According to the above configuration, the pad reinforcement portion A12 can improve the rigidity of both edge portions on the pad back side of the main pad 21. As a result, the main pad 21 can be made less likely to roll against lateral acceleration.

[0064] In addition, the main pad 21A has a non-reinforced portion NR in which the pad reinforcement portion A12 is not provided at the center of the pad body A11 on the seat back side, that is, the center of the pad back side. According to the above structure, the non-reinforced portion NR can appropriately suppress the lateral movement of the main pad 21 without impairing the cushioning performance of the main pad 21.

[0065] In addition, a pair of reinforcement frames (front tube 13, rear tube 14) are provided between the two side frames (lower arm 11) of the seat frame (10). The pad reinforcement portion A12 extends continuously between the pair of reinforcement frames (13, 14) and abuts against the pair of reinforcement frames (13, 14) from the front side of the seat. According to the above structure, the rigidity of the two edge portions on the back side of the pad of the main pad 21 can be further appropriately improved. In addition, the main pad 21 can be made less likely to shift laterally relative to the seat frame (10). As a result, the lateral swing of the main pad 21 can be more appropriately suppressed.

[0066] In addition, the pad reinforcement portion A12 has side portions As and a connecting edge portion Ac. Each side portion As extends along the two edge portions on the back side of the pad of the pad main body A11. The connecting edge portion Ac extends in the seat width direction in a manner that connects the side portions As. The connecting edge portion Ac extends along one (the rear tube 14) of a pair of reinforcement frames (13, 14) and abuts against the one (the rear tube 14) from the front side of the seat. According to the above structure, the pad reinforcement portion A12 becomes a continuous structure in which the side portions As are connected by the connecting edge portion Ac. As a result, the rigidity of the two edge portions on the back side of the pad of the main pad 21 can be more appropriately improved. As a result, the lateral swing of the main pad 21 can be more appropriately suppressed.

[0067] In addition, the seat frame (10) constitutes a frame of a seat cushion 3 having a tilting mechanism M capable of adjusting the seat surface angle of the front edge of the seat. The cushion body A11 of the main cushion plate 21 has a front portion that moves by adjusting the seat surface angle. A resin component (main cushion plate resin component 21C) that is not connected to the cushion reinforcement portion A12 is provided on the seat back side (cushion back front) of the front portion of the cushion body A11. The main cushion plate cover 21B covers the main cushion plate cushion 21A. The end of the main cushion plate cover 21B is fixed to the resin component. The main cushion plate 21 is indirectly fixed to the movable portion (tilting plate 12) of the tilting mechanism M through the resin component.

[0068] According to the above structure, the pad reinforcement part A12 can be appropriately provided on the main pad 21 of the seat cushion 3 in a manner not to hinder the movement of the tilting mechanism M. In addition, the resin component (main pad resin component 21C) can appropriately stop the end of the main pad cover 21B and fix the main pad 21 to the movable part (12) of the tilting mechanism M.

[0069] In addition, the bead foam molded body constituting the pad reinforcement portion A12 includes foamed polypropylene. According to the above structure, the main pad 21 can be molded so as to exhibit appropriate cushioning properties and a roll suppression effect.

[0070] 《Regarding other implementation methods》 The present disclosure can be implemented in various forms other than the above-described embodiments.

[0071] The seat of one embodiment of the present disclosure can be installed in vehicles other than railways, such as airplanes, ships, and other vehicles. In addition, in the above-mentioned embodiment, the features of the present disclosure are applied to the seat cushion. Alternatively, the features of the present disclosure can also be applied to the seat back.

[0072] The cushion reinforcement part is formed of foamed polypropylene as described above. Alternatively, the cushion reinforcement part may also be composed of a bead foaming molded body including foamed styrene. In addition, the cushion reinforcement part may also be composed of a bead foaming molded body combining foamed polypropylene and foamed styrene. As described above, the cushion reinforcement part has left and right side portions As and a connecting side portion Ac. Alternatively, the cushion reinforcement part may not have the connecting side portion Ac but only have left and right side portions As.

[0073] The pad reinforcement portion is provided across a pair of reinforcement frames as described above. Alternatively, the pad reinforcement portion may be placed on only one side of the pair of reinforcement frames, or may be arranged between the pair of reinforcement frames. The pad reinforcement portion has a connecting edge along the rear tube as described above. Alternatively or in addition to this, the pad reinforcement portion may have a connecting edge along the front tube, and the connecting edge abuts against the front tube from the front side of the seat. As described above, the pair of reinforcement frames are tubes. Alternatively, the reinforcement frame may be panel-shaped.

[0074] The pad reinforcement part is formed integrally with the pad main body as described above. Alternatively, the pad reinforcement part may be fixed to the seat frame instead of being integrated with the pad main body. Alternatively, the pad reinforcement part may be formed integrally with the pad main body by fixing the end of the main pad cover covering the main pad pad to the support member.

[0075] The supporting member provided on the main pad may be made of metal in addition to resin. In addition, as described above, the supporting member is indirectly fixed to the movable part of the tilting mechanism. Alternatively, the supporting member may be directly fixed to the movable part of the tilting mechanism. The main pad cover and the side pad cover may be made of leather material in addition to fabric.

Claims

1. A seat having: a cushion body that elastically supports a seated person; and A seat frame supports the seat cushion body from the seat back side, The seat cushion body includes three division elements divided into a main pad constituting a central portion in the seat width direction and side pads constituting both side portions in the seat width direction. The main backing plate comprises: A cushion body is formed of a polyurethane foam molded body; and a cushion reinforcement portion is provided along both edge portions of the cushion body on the seat back side and is formed of a bead foam molded body harder than the cushion body.

2. The seat according to claim 1, wherein: The main pad has a non-reinforced portion where the pad reinforcement portion is not provided at a central portion of the pad main body on the seat back side.

3. The seat according to claim 1 or 2, wherein: The seat frame comprises two side frames and a pair of reinforcement frames mounted on the two side frames. The pad reinforcement portion continuously extends across the pair of reinforcement frames and abuts against the pair of reinforcement frames from the seat front side.

4. The seat according to claim 3, wherein: The liner reinforcement portion has: Side portions extending along both edge portions of the seat back side of the cushion body; and A connecting edge portion extending in the seat width direction in such a manner as to connect the side edge portions, The connecting side portion extends along one of the pair of reinforcement frames and abuts against the one from the seat front side.

5. The seat according to claim 1 or 2, wherein: The seat frame is provided as a frame constituting a seat cushion, and the seat cushion is provided with a tilting mechanism capable of adjusting a seat surface angle of a seat front edge portion. The main pad has a main pad cover covering the pad body. The main pad has a front portion of the pad body that moves by adjusting the seat surface angle and a support member provided on the seat back side of the front portion. The support member is not connected to the pad reinforcement portion, a distal end of the main pad cover is fixed to the support member, and the support member is fixed to the movable portion of the tilting mechanism.

6. The seat according to claim 1 or 2, wherein: The bead foam molded body constituting the cushion reinforcement portion includes foamed polypropylene.

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