Seat and assembly method thereof

Abstract

The invention relates to a seat and an assembling method thereof. The cushion body (20) of the seat is divided into a top plate main body (21) and top plate side parts (22). Each top plate side section (22) has a top plate side section resin member (22C) disposed on the back side of the pad. The fastening bracket (Ab) extends from each inclined arm (12A) of the seat cushion frame (10). The top plate side resin member (22C) overlaps the fastening bracket (Ab) and is fastened by an insertion-type fastening structure (T). Each plug-in fastening structure (T) has a head portion (T1h) of a bolt (T1) that engages with a fastening tool (D). The head part (T1h) is exposed to an opening part (SP) which is an installation space of the top plate main body (21).

Description

Technical Field

[0001] One aspect of the present disclosure relates to a seat and an assembly method thereof. 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 seat back side and an assembly method thereof. Background Art

[0002] Japanese Patent Application Laid-Open No. 2020-33005 discloses a structure in which a seat cushion body composed of a seat pad and a seat cover is divided into three parts in the seat width direction. Specifically, the seat cushion body is divided into three parts, including a top plate body constituting a central part in the seat width direction and top plate side parts constituting both side parts in the seat width direction. The top plate body and the top plate side parts are separately mounted and fixed to a seat frame. Summary of the invention

[0003] Problems to be solved by the invention

[0004] In the structure described in Japanese Patent Gazette No. 2020-33005, the top panel main body and each top panel side portion are respectively fastened and connected with respect to the seat frame by bolts. In detail, after each top panel side portion is installed on the seat frame, the top panel main body is set on the seat frame. The top panel main body is fixed to the seat frame by a nut fastened from the back side of the seat. The seat is mounted on a vehicle. In the case where the top panel main body and each top panel side portion are desired to be removed from the seat frame, the seat needs to be removed from the vehicle once. In this state, the fastening connection of the top panel main body and each top panel side portion with respect to the seat frame is released from the back side of the seat. Therefore, in the past, a seat in which the cushion body can be easily loaded and unloaded relative to the seat frame was required.

[0005] Means for solving problems

[0006] 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 side of the seat. The cushion body is composed of three divided elements divided into a top plate body and top plate side parts, the top plate body constituting the central part in the width direction of the seat, and the top plate side parts constituting the two side parts in the width direction of the seat. Each of the top plate side parts has a top plate side pad that serves as a cushion part, and a supporting member. The supporting member is arranged on the back side of the top plate side pad and fixed to the seat frame. The seat frame has side frames that support each of the top plate side parts from the back side of the seat, and each frame fastening connection part. The supporting member overlaps with the frame fastening connection part, and the supporting member is fastened to the frame fastening connection part via an inserted fastening connection structure. The top plate body is assembled to the seat frame in a detachable manner by snap-fitting. In the top plate body detached state where the top plate body is detached from the seat frame, an opening portion serving as a setting space for the top plate body is generated. The tool engaging portion of the insertion-type fastening structure is exposed toward the opening, and the tool engaging portion is engaged with the fastening tool during the fastening operation.

[0007] As described above, the top plate body is snap-fitted with the seat frame. Therefore, the top plate body can be removed from the seat frame relatively easily. When the top plate body is removed from the seat frame, an opening portion is generated as a space for installing the top plate body. The tool engaging portion of the plug-in fastening structure is exposed to the opening portion. Therefore, the opening portion can be used as a working space to load and unload the top plate side portions relative to the side frames. For example, the top plate side portions can be easily loaded and unloaded without removing the seat from an object such as the ground where the seat is installed.

[0008] According to another aspect of the present disclosure, each of the frame fastening connection parts extends from the corresponding side frame to the inner side oblique back side in the seat width direction. Each of the frame fastening connection parts has an overlapping surface for the support member to overlap. The overlapping surface is perpendicular to the opening.

[0009] There is a structure in which a support spring for supporting a cushion body is arranged between the seat frames. In this structure, it is difficult to put a fastening and connecting tool between the seat frames. Even with such a structure, in the above structure, it is also possible to easily carry out the loading and unloading of each top plate side portion.

[0010] According to another aspect of the present disclosure, a snap-in hole is formed in the side frame. The support member also has a snap-in claw, which is inserted into the snap-in hole and slidably hooked on the side frame. When the snap-in claw is hooked on the side frame, the support member is fastened to each of the frame fastening parts through each of the inserted fastening structures.

[0011] As described above, the top plate side parts are attached to the side frames by hooking by sliding of the engaging claws and fastening by the insertion-type fastening connection structure. Compared with the structure of attaching by snaps with elastic deformation, each top plate side part can be attached to each side frame with a simple and appropriate attachment strength. In addition, each top plate side part can also be easily removed from each side frame.

[0012] According to another aspect of the present disclosure, the tool engaging portion has a head of a bolt, and the head is disposed on a side of each of the insertion-type fastening connection structures that is closest to the opening.

[0013] According to the above structure, the shaft of the bolt does not face the opening. Therefore, the bolt provided on the cushion body is not easily felt as a foreign object.

[0014] According to another aspect of the present disclosure, the top plate body has an engaging claw portion. The engaging claw portion is snap-fitted with the base portion in a removable manner by being pressed in from the seat surface side. The base portion is provided in a manner that is integrated with the seat frame. The top plate body abuts against the seat frame from the seat surface side, and the engaging claw portion is engaged with the base portion.

[0015] Therefore, the top panel body can be easily attached to and detached from the seat frame.

[0016] Another aspect of the present disclosure is an assembly method for assembling a seat. Each of the support members of each top panel side portion overlaps with each corresponding frame fastening connection portion. Each of the support members is mounted to the seat frame by fastening connection of each of the insert-type fastening connection structures (top panel side portion mounting step). The top panel body is mounted to the seat frame (top panel body mounting step).

[0017] As described above, the top panel side portion installation process is performed before the top panel main body installation process. Therefore, the opening portion, which is the installation space of the top panel main body, can be used as a work space. The opening portion can be used to easily install each top panel side portion to the seat frame. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 is a side view of the seat cushion.

[0020] Figure 3 It is a top view of the seat cushion.

[0021] Figure 4 This is an exploded perspective view after the seat cushion body is removed from the seat cushion frame.

[0022] Figure 5It is a top view of the cushion frame.

[0023] Figure 6 It is a bottom view of the cushion body.

[0024] Figure 7 yes Figure 3 VII-VII line cross-sectional view.

[0025] Figure 8 yes Figure 3 Cross-sectional view along line VIII-VIII.

[0026] Fig. 9 yes Figure 8 Enlarged view of section IX.

[0027] Fig.10 yes Figure 3 XX line cross-sectional view.

[0028] Fig.11 It is a perspective view showing a state before one top plate side portion is attached to the side frame.

[0029] Fig.12 This is a perspective view showing a state where one top plate side portion is attached to a side frame.

[0030] Fig.13 yes Fig.12 Cross-sectional view along line XIII-XIII. DETAILED DESCRIPTION

[0031] Hereinafter, one embodiment of the present disclosure will be described using the drawings.

[0032] <<First Implementation Method>>

[0033] (Schematic Structure of Seat 1)

[0034] use Figure 1 to Figure 13 The structure of the seat 1 of the first embodiment will be described. In the following description, each direction such as front, back, up, down, left, and right is shown in each figure. When the word "seat" is added to each direction such as "seat width direction", it means the direction based on the orientation of the seat 1 described later. In addition, in the following description, when a specific reference figure is not shown, or when there is no corresponding symbol in the reference figure, it is appropriately referred to. Figure 1 to Figure 13 Any graph in .

[0035] like Figure 1 As shown, the seat 1 of this embodiment is configured as a right seat for a single person installed on the floor of a car. 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.

[0036] like Figure 2 As shown, the seat cushion 3 is provided with a tilt mechanism M capable of adjusting the seat surface angle of the front portion of the seat. Figure 3~Figure 4 As shown, the seat cushion 3 has a metal cushion frame 10 forming its frame, and a cushion body 20. The cushion body 20 is attached to the upper portion 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".

[0037] like Figure 4 As shown, the cushion body 20 is composed of three divided elements, which are a top plate main body 21 constituting the central part in the seat width direction and each top plate side part 22 constituting the two side parts in the seat width direction. The top plate main body 21 supports the buttocks and thighs of the seated person from below. The top plate main body 21 is formed into a substantially flat surface shape facing upward from the seat. The upper surface of the top plate main body 21, which is the surface on the seat surface side, rises slightly forward.

[0038] like Figure 1 As shown, each top plate side portion 22 supports the buttocks and thighs of the seated person from the oblique lower outer side. Each top plate side portion 22 has an upper surface that becomes the surface of the seat surface. The upper surface stands obliquely toward the outer side in the seat width direction.

[0039] like Figure 4 As shown, the top plate body 21 and each top plate side portion 22 are configured to be individually mounted to the seat cushion frame 10 only by access from above. Thus, the top plate body 21 and each top plate side portion 22 can be easily mounted and removed from the seat cushion frame 10 without removing the seat 1 from the state set on the floor.

[0040] (Structure of seat cushion 3)

[0041] The specific structure of each part of the seat cushion 3 is described below. Figure 4~Figure 5 As shown, the cushion frame 10 has 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 an inclined plate 12 extending in a planar shape across the front end portions of the left and right lower arms 11. In addition, the cushion frame 10 has left and right inclined arms 12A extending from the left and right side edges of the inclined plate 12 toward the rear of the seat.

[0042] The rear end of each tilt arm 12A is rotatably connected to the middle portion of the corresponding lower arm 11 via a tilt rotation shaft 12B extending in the seat width direction. Each tilt arm 12A is tilted in the vertical direction around each tilt rotation shaft 12B by a drive unit (not shown) mounted on the seat cushion frame 10.

[0043] By tilting the tilting arms 12A in the up-down direction, the tilting plate 12 moves up-down relative to the lower arms 11, and the angle of the tilting plate 12 changes. Thus, the seat surface angle of the front portion of the seat cushion 3 is adjusted. The tilting mechanism M is constituted by a mechanism that enables the tilting plate 12 to adjust its angle relative to the lower arms 11.

[0044] The 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 portions of the lower arms 11. The front pipe 13 is located at the rear lower side of the inclined plate 12. The rear pipe 14 is a round pipe and is mounted between the rear portions of the lower arms 11.

[0045] like Figure 4~Figure 5 As shown, a plurality of (for example, four) support springs 15 are provided between the front pipe 13 and the rear pipe 14. The support springs 15 are curved in a corrugated shape in the front-rear direction and the left-right direction (seat width direction). The support springs 15 elastically support the top plate main body 21 of the seat cushion body 20 from below.

[0046] like Figure 4 As shown, each tilt arm 12A is an arm shape with an inverted L-shaped cross section. The tilt 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 part of the side plate portion of the tilt arm 12A. Each tilt arm 12A corresponds to the "side frame" of the present disclosure. In addition, each fastening bracket Ab corresponds to the "frame fastening portion" of the present disclosure.

[0047] like Figure 4~Figure 5 As shown, each fastening bracket Ab is arranged at a position lower and rearward than the front tube 13. In detail, 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 upward and inward. The upper surface faces the installation space of the top plate body 21. Fig.13 As shown in FIG. 1 , the fastening bracket Ab is located directly below the inner side of the top plate side portion 22. A top plate side resin member 22C is provided on the seat back side of the top plate side portion 22. Fig.11 As shown, the fastening portion C24 extends from the top plate side resin member 22C. The fastening portion C24 is fastened to the fastening bracket Ab via the fastening structure T.

[0048] like Fig.11As shown, a keyhole-shaped engaging hole Ah extending in the front-rear direction of the seat is formed in the top plate portion of each tilt arm 12A. The engaging claws C22 formed on the corresponding top plate side portions 22 engage with these engaging holes Ah. Specifically, the engaging claws C22 are formed on the top plate side resin member 22C provided on the seat back side of each top plate side portion 22. The engaging claws C22 are inserted into the engaging hole Ah from above and slide toward the rear of the seat, whereby the engaging claws C22 are hooked on the periphery of the engaging hole Ah. Each top plate side resin member 22C is equivalent to the "support member" of the present disclosure.

[0049] (Structure of Top Plate Body 21)

[0050] like Figure 4 , Figure 6~Figure 8 As shown, the top plate body 21 includes a top plate body pad 21A serving as a cushion, a top plate body cover 21B, and a top plate body resin member 21C. The top plate body cover 21B is made of fabric and covers the top plate body pad 21A. The top plate body resin member 21C is provided at the pad back front portion of the top plate body pad 21A.

[0051] like Figure 6~Figure 8 As shown, the top plate main body cushion 21A has a cushion body A11 composed of a polyurethane foaming molded body and a cushion reinforcement part A12 composed of a bead foaming molded body of foamed polypropylene. For example, the cushion reinforcement part A12 is formed into a U-shaped shape when viewed from above. The cushion reinforcement part A12 is set in the foaming molding mold of the cushion body A11. As a result, the cushion reinforcement part A12 and the cushion body A11 are integrated.

[0052] 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 of the back side of the cushion) of the cushion body A11 on the seat back side. The connecting edge Ac extends in the seat width direction in a manner connecting the rear end portions of each side portion As. 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 top plate body 21. Moreover, the cushion reinforcement portion A12 has the function of appropriately suppressing the lateral swing of the top plate body 21.

[0053] like Figure 4 As shown, the top plate body 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.

[0054] like Figure 8As 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 top plate body 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 from below the seat by the rear pipe 14 over a wide range in the seat width direction.

[0055] Through these supports, the pad reinforcement portion A12 can appropriately suppress the lateral movement of the roof body 21 when the vehicle is subjected to lateral acceleration. Figure 8 As shown, the pad reinforcement portion A12 is not located on or in contact with the inclined plate 12. That is, the pad reinforcement portion A12 is not provided in the front region of the roof body pad 21A, but is provided from the middle portion of the roof body pad 21A in the seat front-rear direction to the rear portion.

[0056] As described above, the pad reinforcement portion A12 is U-shaped in a plan view. As a result, the center portion of the pad body A11 on the seat back side (pad back side center portion) is not reinforced by the pad reinforcement portion A12 (non-reinforced portion NR). That is, the top plate main body pad 21A has the non-reinforced portion NR in the pad back side center portion. The pad back side both edges and the rear edge of the top plate main body pad 21A have the pad reinforcement portion A12. Therefore, the top plate main body pad 21A can appropriately suppress the roll without impairing the cushioning performance.

[0057] The roof panel main body cover 21B covers the roof panel main body pad 21A from above the seat. Figure 6 , the front, rear, left, and right peripheral edges of the top panel main body cover 21B are pulled in and fixed to the seat back side surface of the top panel main body pad 21A, that is, the back side of the pad. Specifically, for the top panel main body cover 21B, from the middle part of the top panel main body pad 21A in the seat front and rear direction where the pad reinforcement part A12 is provided to the rear part, the left and right ends of the top panel main body cover 21B pulled in to the back side of the pad are hooked and fixed to each other. The end of the rear edge of the top panel main body cover 21B pulled in to the back side of the pad is connected to the back side of the pad of the top panel main body pad 21A by a surface fastener not shown.

[0058] like Figure 6 As shown in FIG. 1 , a top plate main body resin member 21C having a U-shape when viewed from above is provided on the back of the top plate main body pad 21A. The top plate main body cover 21B is hooked and fixed to the top plate main body resin member 21C at the ends pulled into the left and right sides and the front side of the back of the pad at the front part of the top plate main body pad 21A. The top plate main body cover 21B is stretched over the entire outer surface of the top plate main body pad 21A by the hooks at the ends of the top plate main body cover 21B. In addition, the top plate main body resin member 21C is fixed in a state pressed against the back of the pad of the top plate main body pad 21A.

[0059] The top plate main body resin member 21C is formed of an injection molded product. The top plate main body resin member 21C is provided at the pad back front portion which is further forward than the area where the pad reinforcement portion A12 of the top plate main body pad 21A is provided. Specifically, the top plate main body resin member 21C is provided in a U-shaped shape in a plan view extending along the left and right edges and the front edge of the pad back front portion of the top plate main body pad 21A.

[0060] The top plate main body resin member 21C has a cover hook claw C11 formed on the front side and left and right sides extending in a U-shape when viewed from above. The ends of the object pulled into the back of the pad of the top plate main body cover 21B are fixed to the cover hook claw C11. The left and right edges of the front side of the top plate main body resin member 21C are equipped with a fitting claw portion C12 consisting of an elastic claw protruding below the seat.

[0061] The top plate body 21 is arranged on the cushion frame 10 from above the seat. Figure 8~Figure 9 As shown, each engaging claw portion C12 of the top panel main body resin member 21C is snap-fitted to the engaged portion C25 of the top panel side portion 22 in a manner of being pressed from above the seat. The top panel side portion 22 has a top panel side portion resin member 22C mounted on the inclined plate 12. The engaging claw portion C12 is formed on the inner side portion of the front end of the top panel side portion resin member 22C. Thus, the front end portion of the top panel main body 21 is engaged with the seat cushion frame 10 via each top panel side portion 22 so as not to be disengaged upward.

[0062] Reference Fig. 9 The engaging claw portion C12 is configured so that, from the above-mentioned snap-fitting state, the operator can apply force by pulling up the front end of the top plate body 21 from under the seat, thereby easily disengaging from the fitting state with the fitted portion C25 of each top plate side portion 22. The fitted portion C25 of each top plate side portion 22 is equivalent to the "base portion" of the present disclosure.

[0063] like Figure 8 As shown in FIG. 1 , the top plate body 21 is mounted relative to the cushion frame 10 in the following manner. First, the rear portion of the top plate body 21 is inserted and set on the rear pipe 14 in a drilled manner from the front of the seat to the lower side of the seat back 2. Next, the front portion of the top plate body 21 is dropped onto the tilt plate 12 with the rear portion of the top plate body 21 as a fulcrum.

[0064] Thus, the respective engaging claws C12 formed at both edges of the front plate portion of the top plate main body resin member 21C are snap-fitted with the engaged portions C25 at the front end inner side portions of the top plate side portions 22 (see Fig. 9 ). In this way, the top plate body 21 is detachably mounted to the seat cushion frame 10 only in two states: abutment from above the seat and engagement with the respective engagement claws C12 at the front end.

[0065] (Structure of Each Top Plate Side Portion 22)

[0066] Reference Figure 4 , Figure 6 as well as Fig.10 Each top plate side portion 22 has a top plate side pad 22A, which serves as a cushion portion, a top plate side cover 22B, and a top plate side resin member 22C. The top plate side cover 22B is made of fabric and covers the top plate side pad 22A. The top plate side resin member 22C is provided on the pad back side of the top plate side pad 22A. Each top plate side portion 22 has a left-right symmetrical structure having the same basic structure as each other.

[0067] like Fig.10 As shown, the top plate side pad 22A is made of a polyurethane foam molding. The surface of the top plate side pad 22A on the seat surface side, that is, the pad surface has a dam-like protrusion. Specifically, the pad surface rises in a manner that bulges obliquely toward the upper side of the seat from the inner side toward the outer side in the seat width direction. The pad back surface of the top plate side pad 22A is recessed along the dam-like protrusion of 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.

[0068] like Fig.10 As shown in FIG. 1 , the top panel side cover 22B covers the top panel side pad 22A from above the seat. The front, rear, left, and right peripheral edges of the top panel side cover 22B are pulled in and fixed to the pad back of the top panel side pad 22A. Specifically, as shown in FIG. Figure 6 As shown, the left and right and front and rear ends of the top plate side cover 22B are pulled into the back of the top plate side pad 22A. In addition, each end of the top plate side cover 22B is hooked and fixed to the top plate side resin member 22C provided along the back of the top plate side pad 22A.

[0069] Thus, the top plate side cover 22B is stretched over the entire outer surface of the top plate side pad 22A. The top plate side resin member 22C is fixed to the pad back surface of the top plate side pad 22A by hooking each end of the top plate side cover 22B.

[0070] like Figure 6 and Fig.10 As shown, the top plate side resin member 22C is an injection molded product in the shape of a curved plate. The top plate side resin member 22C has a shape that matches the concave curved surface of the back surface of the top plate side pad 22A. The top plate side resin member 22C has a side support portion C26 that extends obliquely along the dam-shaped protrusion of the top plate side pad 22A. Therefore, the side support portion C26 supports the dam-shaped protrusion of the top plate side pad 22A from the back side in a planar shape. As a result, the top plate side pad 22A appropriately supports the side of the body of the seated person.

[0071] like Figure 6 and Fig.10 As shown in FIG. 1 , a cover hooking claw C21 is formed at the peripheral edge of the top plate side resin member 22C. The ends of the top plate side cover 22B to be pulled into the back of the pad are fixed to the cover hooking claw C21. Figure 6 As shown, a hook-shaped engaging claw C22 is formed in the substantially central region of the top plate side resin member 22C. The engaging claw C22 protrudes downward from the concave upper region of the top plate side 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 tilt arm 12A.

[0072] Next, the top plate side portion 22 slides rearward relative to the cushion frame 10, whereby the engagement claw C22 is hooked on the engagement hole Ah from the front. By this hooking, the top plate side portion 22 is fixed to the reclining arm 12A so as not to be disengaged above the seat.

[0073] like Figure 6 As shown in FIG. 1 , a guide portion C23 is formed on the lower surface of the top plate side resin member 22C. The guide portion C23 is located in the upper region of the concave curve of the top plate side 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 attaching the top plate side portion 22 to the seat cushion frame 10 (see FIG. 1 ) from above, the top plate side portion 22 is Fig.11 ), the horizontal portion of the guide portion C23 abuts against the upper surface of the top plate portion of the tilt arm 12A. The protruding portion of the guide portion C23 abuts against the outer edge of the top plate portion of the tilt arm 12A. Thus, the guide portion C23 restricts the installation position of the top plate side portion 22 relative to the seat width direction of the cushion frame 10.

[0074] like Figure 11~Figure 13 As shown in FIG. 1 , a plate-shaped fastening portion C24 is formed in the middle portion of the top panel side resin member 22C in the seat front-rear direction. The fastening portion C24 extends obliquely downward from the edge of the inside in the width direction of the top panel side resin member 22C toward the inside in the width direction. The fastening portion C24 overlaps with the upper surface of the fastening bracket Ab by attaching the top panel side 22 to the seat cushion frame 10.

[0075] Then, 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 (impact wrench) for fastening. Thus, the fastening portion C24 is fastened to the fastening bracket Ab.

[0076] 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 matched with the fastening tool D as a tool engaging portion. 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 to be fastened to the weld nut T2.

[0077] The upper surface of the fastening bracket Ab and the fastening part C24 overlapping therewith faces the installation space of the top plate body 21, that is, the opening SP. Therefore, the fastening operation of the bolt T1 using the fastening tool D uses the opening SP as a working space, and can easily approach the fastening part. More specifically, the fastening operation can be performed by only inserting the front end of the fastening tool D obliquely into the fastening part without placing the entire fastening tool D into the opening SP.

[0078] In this structure, the support spring 15 is installed in parallel beside the above-mentioned fastening part on the cushion frame 10. Even with this structure, the above-mentioned fastening work 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 arranged in such a manner that the upper surface faces the opening SP which is the installation space of the top plate body 21. Therefore, when the bolt T1 is removed from the fastening state, the fastening tool D can also be inserted obliquely from the above-mentioned opening SP, and the bolt T1 can be easily loosened.

[0079] (Assembly method of seat cushion 3)

[0080] Next, a method for mounting the cushion body 20 on the cushion frame 10 will be described. Figure 11~Figure 13 As shown, before the roof panel main body 21 is mounted on the seat cushion frame 10 , each roof panel side portion 22 is mounted on the seat cushion frame 10 (roof panel side portion mounting step). The method of mounting each roof panel side portion 22 on the seat cushion frame 10 is as described above.

[0081] Next, the top plate body 21 is mounted on the cushion frame 10 (top plate body mounting step). Through the above steps, the cushion body 20 composed of three divided elements can be easily and appropriately mounted on the cushion frame 10. The order of removing the cushion body 20 from the cushion frame 10 is the opposite order to the above.

[0082] In summary, the seat 1 and the assembling method thereof according to the present embodiment are configured as follows: In addition, the reference numerals in parentheses below are reference numerals corresponding to the respective configurations shown in the above embodiment.

[0083] like Figure 2As shown, the seat (1) comprises a cushion body (20) for elastically supporting a seated person and a seat frame (10) for supporting the cushion body (20) from the back side of the seat. Figure 4 As shown, the cushion body (20) is composed of three divided elements, which are a top plate main body (21) constituting a central portion in the seat width direction and top plate side portions (22) constituting both side portions in the seat width direction. Each top plate side portion (22) has a top plate side portion pad (22A) that becomes a cushion portion and a supporting member (22C). Fig.13 As shown, the support member (22C) is arranged on the back side of the top plate side pad (22A) and is fixed to the seat frame (10).

[0084] like Fig.13 As shown, the seat frame (10) has side frames (12A) and frame fastening connection parts (Ab). Each side frame (12A) supports each top plate side (22) from the seat back side. Each supporting member (22C) overlaps with each frame fastening connection part (Ab), and each supporting member (22C) is fastened to each frame fastening connection part (Ab) via an inserted fastening connection structure (T). Each supporting member (22C) is formed integrally with each side frame (12A). Figure 4 The top plate body (21) is detachably assembled with respect to the seat frame (10) by snap-fitting. When the top plate body (21) is removed from the seat frame (10), each supporting member (22C) overlaps with each frame fastening connection portion (Ab). Fig.13 As shown, a tool engaging portion (T1h) engaged with a fastening tool (D) of each inserted fastening structure (T) is exposed to the outside from an opening portion (SP) serving as a setting space of the top plate body (21).

[0085] According to the above structure, the top plate body (21) is snap-fitted with the seat frame (10). Therefore, the top plate body (21) can be removed from the assembled state relative to the seat frame (10) in a relatively simple manner. In addition, when the top plate body (21) is removed from the seat frame (10), the tool engaging portion (T1h) is exposed to the outside from the installation space of the top plate body (21), that is, the opening portion (SP). Therefore, each top plate side portion (22) can be easily loaded and unloaded without removing the seat (1) from the object at the installation destination. Specifically, the opening portion (SP) can be used as a working space to perform the fastening and loosening operations of the inserted fastening and connecting structure (T) using a fastening and connecting tool (D).

[0086] like Fig.13As shown, each frame fastening connection part (Ab) extends from each corresponding side frame (12A) to the inner oblique back side in the seat width direction. Each frame fastening connection part (Ab) has an overlapping surface (upper surface) for overlapping the corresponding support members (22C). The vertical direction of the overlapping surface is toward the opening part (SP). According to the above structure, each frame fastening connection part (Ab) is arranged in a direction in which the insertion type fastening connection structure (T) is inserted obliquely from the opening part (SP). Therefore, even if there is a structure that is difficult to place the fastening connection tool (D) between the seat frames (10) due to reasons such as the support spring (15) supporting the cushion body (20) being arranged between the seat frames (10), it is possible to easily load and unload each top plate side part (22).

[0087] like Fig.11 As shown, each supporting member (22C) further has a snap-fit ​​claw (C22). The snap-fit ​​claw (C22) is inserted into a snap-fit ​​hole (Ah) formed in each corresponding side frame (12A) and slides. As a result, the snap-fit ​​claw (C22) is hooked on the edge of the snap-fit ​​hole (Ah). In this state, each supporting member (22C) is fastened to each frame fastening connection portion (Ab) through each inserted fastening connection structure (T).

[0088] According to the above structure, the top panel side portion (22) is mounted on the seat frame (10) by hooking based on the sliding of the snap-fit ​​claw (C22) and fastening based on the insertion-type fastening connection structure (T). Compared with the structure of mounting based on the buckle accompanied by elastic deformation, this mounting can easily mount each top panel side portion (22) relative to each side frame (12A) in a state with appropriate mounting strength. In addition, it can also be easily removed.

[0089] like Fig.13 As shown, the tool engaging portion (T1h) of each insert-type fastening connection structure (T) has a head portion (T1h) of a bolt (T1). The head portion (T1h) is arranged on the side closest to the opening portion (SP) in each insert-type fastening connection structure (T). According to the above structure, the shaft portion of the bolt (T1) does not face the opening portion (SP). Therefore, it is not easy to feel the bolt (T1) provided on the cushion body (20) as a foreign object.

[0090] like Fig. 9As shown, the top plate body (21) has a fitting claw portion (C12). The fitting claw portion (C12) is snap-fitted to a base portion (C25) that is integrated with the seat frame (10) by being pressed in from the seat surface side in a manner that allows for loading and unloading. The top plate body (21) abuts against the seat frame (10) from the seat surface side, and the fitting claw portion (C12) is fitted into the seat frame (10). That is, the top plate body (21) can be detachably mounted on the seat frame (10) in only two states. According to the above structure, the top plate body (21) can be easily loaded and unloaded relative to the seat frame (10).

[0091] In the assembly method of the above-mentioned seat (1), each supporting member (22C) of each top panel side portion (22) is overlapped with each corresponding frame fastening connection portion (Ab). Each top panel side portion (22) is installed on the seat frame (10) by fastening connection of each insert-type fastening connection structure (T) (top panel side portion installation process). Then, the top panel main body (21) is installed on the seat frame (10) (top panel main body installation process). According to the above-mentioned structure, the top panel side portion installation process is performed before the top panel main body installation process. As a result, the opening portion (SP) serving as the installation space of the top panel main body (21) becomes a working space. Using this working space, each top panel side portion (22) can be easily installed on the seat frame (10).

[0092] 《Regarding other implementation methods》

[0093] As mentioned above, although one embodiment of the present disclosure has been described, the present disclosure can be implemented in various forms other than the above embodiment.

[0094] The seat disclosed in the present invention may also be installed in vehicles other than automobiles such as railways. Alternatively, the seat may also be installed in transportation vehicles other than vehicles such as airplanes and ships. The structure disclosed in the present invention may be applied to a seat cushion as described above, and may also be applied to a seat back.

[0095] The supporting member provided on each side of the top plate may be made of resin or metal. In addition, one supporting member may be provided for each side frame of the seat frame, or a plurality of supporting members may be provided. The supporting member may also be a structure connected by inserting a clip or fastening with a screw.

[0096] The supporting member may also be an insert-type fastening connection structure composed of a combination of bolts and nuts. In this case, the bolts may be welded to the frame fastening connection portion of each side frame. In addition, the nuts may be fastened to the shaft of the bolts using a fastening connection tool. The bolts and nuts may not be welded to the frame fastening connection portion of each side frame. The bolts and nuts may also be fastened to each side frame, etc., respectively, during installation.

[0097] Fig.11 The frame fastening connection part (Ab) shown is a component different from other components of each side frame. For example, the frame fastening connection part is integrally fixed to other components of the side frame by welding or bolt fastening. Alternatively, the frame fastening connection part may also be composed of the same components as other components of the side frame. Fig.11 The frame fastening connection part shown extends from each side frame to the inner side oblique back side in the seat width direction. Alternatively, the frame fastening connection part may extend straight from each side frame to the seat back side, may extend straight to the inner side in the seat width direction, or may extend in a bent shape formed by combining these.

[0098] Fig. 9 The engaging claw C12 shown is snap-engaged with the engaged portion C25 (base member) of the top panel side portion 22. The base member may be the seat frame itself or another member provided on the seat frame. The top panel main cover and the top panel side cover may each be made of a leather material other than fabric.

Claims

1. A seat, wherein: have: Seat frame; and The seat cushion body is supported by the seat frame from the back side and elastically supports the seated person. The cushion body is composed of three divided elements, namely, a top plate main body and top plate side parts. The top plate main body constitutes a central part in the seat width direction, and the top plate side parts constitute two side parts in the seat width direction. Each of the top panel side portions has a top panel side pad and a support member disposed on the back surface of the top panel side pad and fixed to the seat frame. The seat frame includes side frames supporting the side portions of the top plate from the seat back side and frame fastening portions integrated with the side frames. Each of the supporting members overlaps with each of the frame fastening connection parts, and each of the supporting members is fastened and connected to each of the frame fastening connection parts via an inserted fastening connection structure. The top panel body is detachably mounted on the seat frame by snap fitting. In a top panel body detached state in which the top panel body is detached from the seat frame, an opening portion is generated as an installation space for the top panel body, and the tool engaging portions of each of the male fastening structures are exposed to the opening portion.

2. The seat according to claim 1, wherein: Each of the frame fastening connection parts extends from the corresponding side frames toward the inner side oblique back side in the seat width direction. Each of the frame fastening and connecting portions has an overlapping surface on which the corresponding support members overlap, and a surface perpendicular direction of the overlapping surface faces the opening.

3. The seat according to claim 1 or 2, wherein: A locking hole is formed in each of the side frames. Each of the support members further includes an engagement claw that is inserted into the engagement hole and slidably hooked on the side frame.

4. The seat according to claim 1 or 2, wherein: The tool engaging portion has a head of a bolt, The head is disposed on a side of each of the insertion-type fastening connection structures that is closest to the opening.

5. The seat according to claim 1 or 2, wherein: A base portion is provided which is integrated with the seat frame. The top plate body has a fitting claw portion that is detachably snap-fitted with the base portion by being pressed in from the seat surface side.

6. A method for assembling a seat, assembling the seat according to claim 1 or 2, wherein: The supporting members on the side portions of the top plates are overlapped with the corresponding frame fastening and connecting portions. Each of the top panel sides is mounted on the seat frame by fastening connections of each of the insert-type fastening connections, After the installation of the roof panel side portions, the roof panel body is installed to the seat frame.

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