Seat back

Abstract

A seat back (2) is provided with a side airbag device (30) attached to the outer side of a back frame (10). A seat cushion body for elastically supporting a seated person of a seat back (2) is provided with: a side cushion pad (22A) serving as a seat cushion part; a side pad cover (22B) that covers the side pad pad (22A); and a side pad resin member (22C) which is provided on the pad back surface of the side pad pad (22A) and which supports the side pad pad (22A), stops the end of the side pad cover (22B), and fixes the side pad cover (22B) to the backrest frame (10). The cushion body is provided so as to cover the side airbag device (30) from the front of the seat, and the side cushion plate resin member (22C) has an opening (C27) that opens a deployment region of the airbag (31) that bulges toward the front of the seat.

Description

Technical Field

[0001] One aspect of the present disclosure relates to a seat back and, more specifically, to a seat back 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. 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 divided into three parts into 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 Gazette No. 005, an embedded wire that serves as a reinforcement and a plate for mounting on the seat frame are assembled on the side pad. Therefore, it is difficult to apply a seat cushion body having such embedded wires and a plate for mounting to a structure in which a side airbag device is mounted on the outer side of a seat back. This is because the deployment path of the airbag may be obstructed. Therefore, it has been necessary to properly assemble the seat cushion body to the seat back of the seat frame in a manner that does not obstruct the deployment path of the airbag of the side airbag device. Means for solving technical problems

[0004] One method disclosed herein is a seat back having: a cushion body that elastically supports a seated person; a seat frame that supports the cushion body from the seat back side; and a side airbag device that is mounted on the outer side of one side of the seat frame in the seat width direction and is equipped with an airbag that bulges out toward the front of the seat. The cushion body has a seat cushion that serves as a cushion portion, a seat cover that covers the seat cushion, and a support component. The support component is arranged in a manner that extends in a planar manner along the surface of the seat back side of the seat cushion, i.e., the back side of the cushion, and is responsible for planar support of the seat cushion from the seat back side, fixing the end of the seat cover, and fixing it to the seat frame. The cushion body is arranged in a manner that covers the side airbag device from the front of the seat. The support component has an opening that opens a deployment area of ​​the airbag that bulges out toward the front of the seat.

[0005] Therefore, by providing the support member extending in a planar manner along the back surface of the seat cushion, the seat cushion can be supported in a planar manner from the seat back side, the end of the seat cover can be fixed and fixed to the seat frame. Furthermore, by providing the support member having such a function with an opening portion that opens the deployment area of ​​the airbag, the seat cushion body can be appropriately assembled to the seat frame in a manner that covers the side airbag device from the front of the seat without obstructing the deployment path of the airbag.

[0006] According to another aspect of the present disclosure, the seat cushion body is composed of three divided elements, namely, a main pad constituting a central portion in the seat width direction and side pads constituting two side portions in the seat width direction. The support member has a side support portion, which is provided on one of the side pads provided so as to cover the side airbag device from the front of the seat and supports the body of the seated person from an oblique side via the seat pad.

[0007] Therefore, the body of the seat occupant can be appropriately supported laterally by the side support portion of the support member that is fixed to the seat frame and supports the seat cushion in a planar manner from the seat back side.

[0008] According to another embodiment of the present disclosure, the seat back further comprises a lining cloth. The lining cloth is provided in a manner to cover the side airbag device from behind the seat. The ends of the front end of the lining cloth after covering are passed from the opening of the support member through the slit of the seat pad constituting the deployment path of the airbag and are sewn to the ends of the sewed cover pieces of the seat cover that are broken by the deployment pressure of the airbag.

[0009] Therefore, the airbag can be appropriately pressed against the sewn portion of the sewn ends of the cover panels of the seat cover, which becomes the burst line, from the opening of the support member through the slit of the seat pad via the lining cloth. As a result, the inflation and deployment pressure of the airbag can be appropriately concentrated on the burst line, so that the airbag can be appropriately inflated and deployed. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view showing a schematic structure of a seat back according to an embodiment. Figure 2 It is the front view of the seat back. Figure 3 This is an exploded perspective view of the seat cushion body removed from the backrest frame. Figure 4 It is the front view of the backrest frame. Figure 5 It is a rear view of the cushion body. Figure 6 It is a perspective view showing a state where the seat cushion body is assembled to the backrest frame. Figure 7yes Figure 2 VII-VII line cross-sectional view. Figure 8 It is a perspective view showing a state where the resin member of the outer side shim is assembled to the side frame. Fig. 9 yes Figure 2 IX-IX line cross-sectional view. DETAILED DESCRIPTION

[0011] 《1 implementation method》 (Schematic structure of seat back 2) use Figure 1 to Figure 9 The structure of a seat back 2 according to an embodiment of the present disclosure will be described. In the following description, each direction of front, back, top, bottom, left, and right is shown in each figure. The direction with "seat" is a 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 symbol in the reference figure, a reference shall be made to the reference figure as appropriate. Figure 1 to Figure 9 Any of the graphs in .

[0012] like Figure 1 As shown, the seat back 2 involved in this embodiment is a backrest of a seat 1 for single riding arranged on the floor of a car. The seat 1 is a right seat of the car, and 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.

[0013] like Figure 2 As shown, the seat back 2 is provided with a side airbag device 30 on the right side portion which is the outer side in the vehicle width direction. The side airbag device 30 is a well-known device which, when a vehicle collision is detected, pierces the seat back 2 and bulges forward of the seat to protect the head and chest of the seated person from collision.

[0014] like Figure 3 As shown, the seat back 2 includes a metal back frame 10 constituting its frame and a cushion body 20 assembled to the front portion of the back frame 10 to elastically support the waist and back of the seated person. In addition, the seat back 2 includes a back plate 40 assembled to the rear portion of the back frame 10 and covering the back of the seat back 2. Here, the back frame 10 corresponds to one of the "seat frames".

[0015] like Figure 1 As shown, the seat cushion body 20 is composed of three divided elements, namely, a main pad 21 constituting a central portion in the seat width direction and side pads 22 constituting two side portions in the seat width direction. The main pad 21 supports the waist and back of the seated person from behind.

[0016] Each side bolster 22 supports the waist and back of the seated person from the rear obliquely outward. Each side bolster 22 has a front surface that becomes the front side of the seat. The front surface of the side bolster 22 is a surface shape that rises obliquely forward toward the outside in the seat width direction.

[0017] The main pad 21 and the side pads 22 are separately assembled to the back frame 10 from the front of the seat. Specifically, the main pad 21 and the side pads 22 can be easily attached to and detached from the back frame 10 without removing the seat 1 from the state set on the floor.

[0018] (Structure of seat back 2) The specific structure of each part of the seat back 2 will be described below. Figure 3~Figure 4 As shown, the backrest frame 10 has a pair of left and right side frames 11 extending in the vertical direction along the left and right side portions of the seat back 2. In addition, the backrest frame 10 has an upper frame 12 and a lower frame 13. The upper frame 12 is installed across the upper end portions of the side frames 11. The lower frame 13 is installed across the lower end portions of the side frames 11.

[0019] The back frame 10 further includes a planar lumbar plate 14 provided in a span between the upper frame 12 and the lower frame 13. The lumbar plate 14 is provided in a span between the upper frame 12 and the lower frame 13 via a support spring 15 bent into a U-shape in a front view.

[0020] The upper ends of the U-shaped support spring 15 pass through the upper frame 12 from below the seat. The support spring 15 is assembled so that the lower side of the U-shaped support spring 15 is elastically supported from behind the seat to the front of the lower frame 13 via a torsion spring (not shown). The lumbar plate 14 is a flat plate-shaped member made of resin that is long in the vertical direction.

[0021] The upper and lower ends of the lumbar plate 14 are assembled to the left and right sides of the U-shaped support spring 15 in a manner that allows them to slide in the up-down direction. The lumbar plate 14 is configured to move up and down along the sides of the support spring 15 by a drive unit (not shown) assembled to the backrest frame 10.

[0022] The lumbar plate 14 moves so that the distance between the upper end and the lower end thereof is close, thereby the middle portion between the upper end and the lower end of the lumbar plate 14 is bent in a bow-shaped manner toward the front of the seat. As a result, the support position (lumbar support position) of the lower half of the main pad 21 of the seat cushion body 20 by the lumbar plate 14 is pushed toward the front of the seat. As a result, the support pressure of the main pad 21 on the occupant's waist is increased. In addition, the lumbar plate 14 can adjust the lumbar support position in the up-down direction by moving the upper end and the lower end thereof up-down together.

[0023] The left and right edges of the lumbar plate 14 have a plurality of fins 14A extending in a corrugated manner to the left and right (outward in the seat width direction). The lumbar plate 14 has a pair of left and right longitudinal surfaces extending in a planar manner in the vertical direction along the respective side edges of the U-shaped support spring 15. Each fin 14A extends outward in a corrugated manner from the outer edge of each longitudinal surface of the lumbar plate 14. Thus, each fin 14A expands the corrugated support surface in a region outside the respective side edges of the U-shaped support spring 15.

[0024] A plate-shaped fastening bracket 11A extending obliquely rearwardly inwardly in the seat width direction is welded to the rear edge of each side frame 11. Each fastening bracket 11A is arranged with its front surface (overlapping surface) facing obliquely inwardly forwardly facing the installation space of the main pad 21. A fastening portion C25 extending from a side pad resin member 22C is provided on the seat back side of each side pad 22. The corresponding fastening portion C25 is fastened to the fastening bracket 11A via an insertion-type fastening structure.

[0025] A bracket having a circular hole-shaped engaging hole 11B is joined to the outer side of the lower end side of each side frame 11. An engaging clip C24 is attached to the lower part of the side pad resin member 22C on the seat back side of each side pad 22. The corresponding engaging clip C24 engages with the engaging hole 11B by snap-fitting by insertion from the front of the seat.

[0026] Support brackets 12A extending in a vertical direction in a square cylindrical shape are welded to the left and right positions of the upper frame 12 in a vertically penetrating state. Each support bracket 12A is inserted and welded to the top plate and bottom plate of the upper frame 12 in a vertically penetrating state. The upper end of each support bracket 12A is provided in a manner protruding from the top plate of the upper frame 12 toward the upper side of the seat.

[0027] Each support bracket 12A is used to Figure 1 The headrest 4 mentioned above is inserted from above the seat and mounted on the mounting portion of the upper part of the seat back 2 to function. A headrest support member (not shown) is inserted from above the seat and mounted on each support bracket 12A. The headrest support member can be mounted by inserting a pair of left and right headrest pillars (not shown) hanging from the headrest 4 from above the seat.

[0028] The upper frame 12 has a fitting hole 12B formed by hollowing out the top plate so as to penetrate in the up-down direction at each of the left and right ends (shoulder openings) of the upper frame 12. An upper fitting portion C22 is formed on the upper portion of the side pad resin member 22C on the seat back side of the side pad 22. The corresponding upper fitting portion C22 is fitted into each fitting hole 12B by being hooked from above the seat.

[0029] (Structure of main pad 21) Next, the structure of the main pad 21 and the side pads 22 constituting the cushion body 20 will be described. First, the structure of the main pad 21 will be described. Figure 3 , Figure 5 as well as Figure 7 As shown, the main pad 21 includes a main pad liner 21A, a main pad cover 21B, and a main pad resin component 21C. The main pad liner 21A serves as a seat cushion. The main pad cover 21B is made of fabric and covers the main pad liner 21A. The main pad resin component 21C is provided on the seat back side of the main pad liner 21A, i.e., the pad back side.

[0030] like Figure 5 and Figure 7 As shown, the main pad pad 21A is made of a polyurethane foamed body. Figure 3 As shown, the main pad 21A is a cushion-like shape that covers the upper frame 12 and the lumbar plate 14 of the back frame 10 from the front of the seat. Specifically, the main pad 21A has a flange portion that covers the top plate portion of the upper frame 12 from above the seat.

[0031] A pair of square hole-shaped support through holes A11 are formed on the upper flange of the main pad liner 21A and penetrate in the vertical direction. When the flange of the main pad liner 21A is covered on the top plate of the upper frame 12 via the main pad resin component 21C described later, each support through hole A11 passes through the upper end of each corresponding support bracket 12A and is provided on the top plate.

[0032] The main pad cover 21B covers the main pad liner 21A from the front of the seat. The upper, lower, left, and right peripheral edges of the main pad cover 21B are pulled in and fixed to the pad back of the main pad liner 21A. Figure 5 As shown, the ends of the peripheral edge portions of the main pad cover 21B pulled into the back side of the pad are hooked and fixed to a main pad resin member 21C having a frame shape in rear view provided on the back side of the pad.

[0033] The main pad cover 21B is stretched over the entire outer surface of the main pad liner 21A by the hooks described above. In addition, the main pad resin member 21C is fixed to a state of being pressed against the pad back surface of the main pad liner 21A by the hooks at the respective ends of the main pad cover 21B. In the eaves region of the main pad cover 21B covering the eaves of the main pad liner 21A, square hole-shaped support through holes B11 are formed through the eaves in the up-down direction to connect the support through holes A11 to the outside.

[0034] like Figure 7As shown, the middle portion in the vertical direction of the area of ​​the main pad cover 21B covering the front surface of the main pad liner 21A is suspended from the front of the seat and fixed in a suspension groove A12 formed at a corresponding position of the main pad liner 21A. Specifically, a suspension portion B12 is formed on the back side of the cover of the above-mentioned suspended middle portion of the main pad cover 21B. The suspension portion B12 includes a suspension cotton cloth and a suspension line. The suspension cotton cloth is a tubular cotton cloth sewn in a manner extending in the seat width direction along the middle portion. The suspension line passes along the suspension cotton cloth.

[0035] The hanging portion B12 is pulled from the front of the seat into the hanging groove A12 of the main pad pad 21A so as to penetrate in the pad thickness direction (the seat front-rear direction). The hanging portion B12 is hooked and fixed to the hooks CL1 of the four fixing clips CL on the back of the pad. The fixing clips CL are attached to the clip locking portions C14 of the main pad resin member 21C and arranged in the seat width direction. As a result, the main pad cover 21B is stretched in a state where its middle portion is closely attached to the outer surface of the main pad pad 21A.

[0036] The fixing clip CL is formed of a resin injection molded product, and the resin injection molded product has a hook CL1 hooked on the above-mentioned hanging part B12 and a seat part CL2 which is a mounting part mounted on the main pad resin part 21C. The fixing clip CL is provided in such a manner that the hooks CL1 are inserted from the rear of the seat into the corresponding holes opened in the main pad resin part 21C. As a result, the clip locking parts C14 formed of elastic claws formed around the holes of the main pad resin part 21C are snap-fitted and fitted in a state of abutting against the rear surface of the seat part CL2 of the fixing clip CL.

[0037] Thus, the seat portion CL2 is mounted between the rear surface of the main pad resin member 21C and the clip locking portion C14 in a state of being clamped in the front-rear direction. Furthermore, by this mounting, each of the fixing clips CL is set such that the hook CL1 protrudes from the main pad resin member 21C toward the front of the seat, and the hook CL1 is inserted into the hanging groove A12 of the main pad pad 21A. The fixing clips CL and the hanging portion B12 are well-known structures, and thus the detailed description thereof is omitted.

[0038] like Figure 5As shown in FIG. 1 , the main pad resin member 21C is formed of an injection molded product formed into a frame-like shape extending along the outer peripheral edge of the pad back surface of the main pad pad 21A in a rear view. Cover hook claws C11 for fixing the ends of the front end of the pad back surface pulled into the main pad cover 21B are formed on the left, right and upper side portions of the main pad resin member 21C extending in a frame-like shape in a rear view. The main pad resin member 21C is fixed to the pad back surface of the main pad pad 21A via the main pad cover 21B by fixing the ends of the main pad cover 21B with the cover hook claws C11.

[0039] like Figure 3 As shown, in the eave region of the main pad resin part 21C overlapping with the pad back of the eave portion of the main pad pad 21A, square hole-shaped support through holes C12 are formed to penetrate in the up-down direction. Each support through hole C12 connects each support through hole A11 of the main pad pad 21A with the lower side of the seat.

[0040] like Figure 3 As shown in FIG. 1 , the main pad 21 is assembled to the backrest frame 10 from above the seat in the following manner. First, the upper portion of the main pad 21, which extends to the rear of the seat, is covered on the upper frame 12. At this time, each support through hole C12 of the main pad resin member 21C is set to pass through the upper end of each corresponding support bracket 12A on the upper frame 12. Thus, the flange of the main pad 21 is hooked on the upper end of each support bracket 12A and is set in a fixed position.

[0041] Next, the main pad 21 is dropped into the seat from the front to cover the waist plate 14, using the hooked eaves as a fulcrum. Figure 6 As shown, the middle fins 14A (hooking portions 14B) of the lumbar plate 14 extending to the left and right are hooked on the front surface of the hooked portions C13. The hooked portions C13 are portions extending from the inner edges of the left and right frame sides of the main pad resin member 21C.

[0042] As a result, the fin portions 14A (hooking portions 14B) arranged vertically and hooked on the hooked portions C13 are pressed against the rear surfaces of the left and right frame side portions of the main pad resin member 21C. As a result, the frame side portions of the main pad resin member 21C are pressed and clamped front and back by the fin portions 14A.

[0043] The main cushion plate 21 further extends from the lower portion thereof to the lower portion of the seat, and the distal end of the main cushion plate cover 21B is pulled inward toward the rear of the seat through the lower side of the lower frame 13 of the backrest frame 10, and is fixed to the rear surface of the lower frame 13. Through the above assembly, the main cushion plate 21 is disposed in a state where the upper portion, the lower portion, and the middle portion thereof are engaged with the backrest frame 10 or the lumbar plate 14, respectively.

[0044] By the above assembly, when the lumbar plate 14 is bent in an arched shape toward the front of the seat and when the bending is restored toward the rear of the seat, the main pad 21 moves in the front-rear direction of the seat following the movement of the lumbar plate 14. In addition, when the position of the lumbar plate 14 is adjusted in the up-down direction, the main pad 21 appropriately avoids the movement by sliding each fin portion 14A up-down along the main pad resin member 21C.

[0045] (Structure of each side pad 22) Next, refer to Figure 3 , Figure 5 as well as Fig. 9 , the structure of each side pad 22 is described. Each side pad 22 has a side pad liner 22A, a side pad cover 22B, and a side pad resin component 22C. The side pad liner 22A is a seat cushion. 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 of the side pad liner 22A.

[0046] Each side bolster 22 has a substantially similar basic structure, but has a different shape in accordance with the installation of the side airbag device 30 on the right side of the seat back 2, such as the presence or absence of a path for deploying the airbag 31 and the ensuring of the installation space of the side airbag device 30. Here, the side bolster pad 22A corresponds to the "seat pad" of the present disclosure. In addition, the side bolster cover 22B corresponds to the "seat cover" of the present disclosure. In addition, the side bolster resin member 22C corresponds to the "support member" of the present disclosure.

[0047] like Fig. 9 As shown, the side bolster pad 22A is made of a polyurethane foamed body. The side bolster pad 22A is formed so that its seat front side surface, i.e., the pad surface, has a dam-like protrusion that rises from the inside to the outside in the seat width direction and bulges obliquely toward the front of the seat.

[0048] The back surface of the side pad 22A is formed into a concave curved surface shape hollowed out in a concave manner along the above-mentioned dam-shaped extension. Figure 3 and Figure 5 As shown, the side bolster pad 22A also has a shape having a flange portion at its upper portion that covers the top plate portion of the upper frame 12 from above the seat.

[0049] The side bolster cover 22B covers the side bolster pad 22A from the front of the seat. The upper, lower, left, and right peripheral edges of the side bolster cover 22B are pulled in and fixed to the back surface of the side bolster pad 22A. Specifically, the upper, lower, left, and right ends of the side bolster cover 22B are pulled in the back surface of the side bolster pad 22A. The ends pulled in the back surface of the side bolster pad 22A are hooked on the curved plate-shaped side bolster resin member 22C provided along the back surface of the pad. Thus, the side bolster cover 22B is fixed to the side bolster pad 22A.

[0050] The side pad cover 22B is stretched over the entire outer surface of the side pad liner 22A by the hooks. The side pad resin member 22C is fixed to the pad back surface of the side pad liner 22A by hooks at the respective ends of the side pad cover 22B.

[0051] like Figure 5 and Fig. 9 As shown in FIG. 1 , the side pad resin member 22C is an injection molded product formed into 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 region that extends from the pad back side and obliquely supports the dam-shaped extension of the side pad liner 22A as a side support portion C26. The dam-shaped extension of the side pad liner 22A is supported in a planar manner from the pad back side by the side support portion C26. Thus, the side pad liner 22A can appropriately support the body of the seated person.

[0052] A cover hook claw C21 is formed at the peripheral edge of the side pad resin member 22C. The cover hook claw C21 stops each end of the front end of the pad back surface of the side pad cover 22B. Figure 5 As shown, an upper end fitting portion C22 that protrudes toward the lower side of the seat is formed in a flange region of the side bolster resin member 22C that overlaps with the pad back surface of the flange portion of the side bolster pad 22A.

[0053] When the side pad 22 is assembled to the backrest frame 10 (see Figure 3 ), the upper end fitting portion C22 is inserted from above the seat into the corresponding fitting holes 12B formed at the left and right ends (shoulder openings) of the upper frame 12. By the above insertion, the upper portion of the side pad 22 is hooked on the upper frame 12 and is set in a fixed position.

[0054] like Figure 5 As shown, a seat portion C23 protruding toward the rear of the seat is formed at the lower portion of the side pad resin component 22C. A mating clip C24 is installed at the front end of the seat portion C23. Figure 3), the engaging clip C24 is inserted into the corresponding circular hole-shaped engaging hole 11B formed at the rear edge portion of the lower end side of each side frame 11 with snap fit. In this way, the lower portion of the side pad 22 is engaged with the lower portion of each side frame 11 and is set in a state of being fixed in position.

[0055] In addition, a fastening portion C25 is formed in the middle portion of the side lining resin member 22C in the vertical direction. The fastening portion C25 is plate-shaped and extends obliquely rearward from the inner edge in the seat width direction toward the inner side in the seat width direction. Figure 8 As shown, the fastening portion C25 is provided so as to overlap with the front surface (the overlapping surface facing obliquely forward) of the fastening bracket 11A extending obliquely inwardly and rearwardly from each side frame 11 by assembling the side pad 22 to the back frame 10 .

[0056] After the above arrangement, a bolt B, which is an insertion type fastening structure, is inserted into the fastening portion C25 and the fastening bracket 11A using a fastening tool (eg, an impact screwdriver) not shown to fasten them.

[0057] (Structure of Side Airbag Device 30) Next, refer to Fig. 9 The structure of the side airbag device 30 will be described. The side airbag device 30 is mounted on the right side portion (outer side portion) of the side frame 11 on the right side (outer side in the vehicle width direction). The side airbag device 30 is formed into a vertically long box shape extending in a strip shape in the vertical direction along the right side frame 11 (see Figure 4 ).

[0058] Specifically, the side airbag device 30 includes an airbag 31, an inflator 32, a housing 33, a guide plate 34, and a lining cloth 35. The side airbag device 30 receives an input of a detection signal of a vehicle collision from an ECU of a vehicle (not shown), and injects gas from the inflator 32 into the airbag 31. As a result, the airbag 31 is inflated and deployed forward of the seat. The airbag 31 pierces the seat back 2 in a wide range in the up-down direction of the seat back 2 and inflates and deploys forward of the seat into a vertically long bag shape.

[0059] The housing 33 is a vertically long box-shaped container that accommodates the airbag 31 and the inflator 32. The housing 33 is fixed to the right side of the side frame 11 on the right side by bolts at two locations on the upper and lower sides of the inner side. The housing 33 has an open cross-sectional container structure in which the right front corner is opened by a vertically long slit. When the airbag 31 is inflated and deployed, the housing 33 pushes the right front corner open by the deployment pressure, so that the airbag 31 is inflated and deployed toward the front of the seat.

[0060] The housing 33 is provided as described above, and is disposed so as to be located on the back side of the side pad resin member 22C. Therefore, the side pad resin member 22C is provided with an opening C27 that opens the deployment area of ​​the airbag 31. This is to ensure a deployment path of the airbag 31 that bulges out from the housing 33 located on the back side of the side pad resin member 22C. The opening C27 is formed in a vertically long rectangular opening shape so as to open substantially the entire area of ​​the area directly facing the housing 33.

[0061] The guide plate 34 is made of a metal plate-like member having an L-shaped cross section. The guide plate 34 is fixed to the side portion of the rear side of the housing 33 and is provided so as to cover the right side portion. The guide plate 34 is provided so as to extend from the right side portion of the housing 33 through the opening C27 of the side pad resin member 22C toward the front of the seat. Thus, when the airbag 31 is inflated and deployed, the guide plate 34 covers the edge of the opening C27 from the inside. Therefore, the airbag 31 is protected from direct contact with the edge of the opening C27.

[0062] The lining cloth 35 is a longitudinal guide cloth that guides the deployment direction of the airbag 31. The lining cloth 35 is composed of a single cloth member. The lining cloth 35 covers the shell 33 from the rear of the seat. In addition, each end of the front end of the lining cloth after covering the shell is sewn to each sewing end B21 of the side pad cover 22B through the slit A21 of the side pad pad 22A from the opening C27. Each sewing end B21 is the end of each cover piece that will be sewn to break due to the deployment pressure of the airbag 31.

[0063] The slit A21 formed in the side bolster 22A is a hole for allowing the airbag 31 to bulge out from the opening C27 toward the front of the seat to pass through when the airbag 31 is inflated and deployed. The slit A21 is formed to extend through substantially the entire area of ​​the side bolster 22A in the vertical direction directly facing the housing 33 in a long strip shape.

[0064] The airbag 31 receives gas from the inflator 32, pushes the housing 33 open, and bulges through the opening C27 of the side pad resin member 22C. Then, the slit A21 of the side pad pad 22A is further widened from the pad back side and bulges forward of the seat. In addition, the airbag 31 breaks the stitching of each stitched end B21 of the burst line BL of the side pad cover 22B stitched to each end of the lining cloth 35 by its deployment pressure. As a result, the airbag 31 expands and deploys forward of the seat from between each stitched end B21.

[0065] (Assembly method of seat back 2) Next, a method for assembling the seat cushion body 20 to the backrest frame 10 will be described. Figure 3The cushion body 20 first assembles the side pads 22 to the backrest frame 10 before the main pad 21 (side pad assembly process). The method of assembling the side pads 22 to the backrest frame 10 is as described above.

[0066] After the side pads 22 are assembled, the main pad 21 is assembled to the back 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 back frame 10. In addition, the step of removing the cushion body 20 from the back frame 10 is the opposite step to the above.

[0067] As described above, the seat back 2 according to the present embodiment has the following structure: In addition, the reference numerals in parentheses below are reference numerals corresponding to the respective structures shown in the above-mentioned embodiment.

[0068] The seat back (2) comprises a cushion body (20) for elastically supporting a seated person and a seat frame (10) for supporting the cushion body (20) from the seat back side. The seat back (2) comprises an outer side portion mounted on one side of the seat width direction of the seat frame (10) and having a side airbag device (30) for providing an airbag (31) that bulges out toward the front of the seat.

[0069] The cushion body (20) comprises: a seat cushion (22A) constituting a seat cushion portion; a seat cover (22B) covering the seat cushion (22A); and a support member (22C) arranged to extend in a planar manner along the seat back side surface of the seat cushion (22A), i.e., the back side of the cushion, and responsible for planar support of the seat cushion (22A) from the seat back side, fixing the end of the seat cover (22B) and fixing to the seat frame (10). The cushion body (20) is arranged to cover the side airbag device (30) from the front of the seat. The support member (22C) has an opening portion (C27) for opening a deployment area of ​​the airbag (31) bulging toward the front of the seat.

[0070] According to the above structure, by providing a support member (22C) extending in a planar manner along the back side of the seat cushion (22A), the seat cushion (22A) can be supported in a planar manner from the back side of the seat, the end of the seat cover (22B) can be fixed, and the seat cover (22B) can be fixed to the seat frame (10). Furthermore, by providing an opening (C27) for opening the deployment area of ​​the airbag (31) on the support member (22C) having such a function, the seat cushion body (20) can be appropriately assembled to the seat frame (10) in a manner that covers the side airbag device (30) from the front of the seat without obstructing the deployment path of the airbag (31).

[0071] The seat cushion body (20) is composed of three divided elements, namely, a main pad (21) constituting a central portion in the seat width direction and side pads (22) constituting two side portions in the seat width direction. The support member (22C) has a side support portion (C26) provided on one side pad (22) provided in a manner covering the side airbag device (30) from the front of the seat, and supporting the body of the seated person from an oblique side via the seat pad (22A).

[0072] According to the above structure, the side support portion (C26) of the support member (22C) is fixed to the seat frame (10) and supports the seat pad (22A) in a planar manner from the seat back side, so that the body of the seated person can be appropriately supported laterally.

[0073] The seat back (2) further comprises a lining cloth (35). The lining cloth (35) is arranged in a manner to cover the side airbag device (30) from the rear of the seat, and each end of the front end after covering is passed from the opening (C27) of the support member (22C) through the slit (A21) of the seat pad (22A) constituting the deployment path of the airbag (31) and is sewn to the sewn ends (B21) of each cover piece of the seat cover (22B) that will be broken by the deployment pressure of the airbag (31).

[0074] According to the above structure, the airbag (31) can be appropriately pressed against the sewn portion of the sewn ends (B21) of each cover sheet of the seat cover (22B) which becomes the burst line (BL) through the lining cloth (35) from the opening (C27) of the support member (22C) through the slit (A21) of the seat pad (22A). As a result, the inflation and deployment pressure of the airbag (31) can be appropriately concentrated on the burst line (BL), so that the airbag (31) can be appropriately inflated and deployed.

[0075] 《Regarding other implementation methods》 The present disclosure can be implemented in various forms other than the above-described embodiment.

[0076] The seat back of the present disclosure can also be configured as a seat back for a seat mounted on a vehicle other than a railway or automobile, or a vehicle other than an airplane or ship. In addition, the seat cushion body can be configured as a single structure that is not divided, in addition to being configured as three divided elements, namely, a main pad and side pads.

[0077] The support member provided on the cushion back surface of the seat cushion and fixed to the seat frame may be made of metal other than resin.

[0078] The main pad cover and the side pad cover may be respectively made of a leather material other than fabric.

[0079] The various embodiments described in detail above with reference to the accompanying drawings are representative examples of the present invention and do not limit the present invention. The detailed description is intended to teach those skilled in the art various ways to make, use and / or implement the present demonstration and does not limit the scope of the present invention. In addition, the above-mentioned additional features and demonstrations can be applied and / or used separately or in combination with other features and demonstrations to provide an improved seat back and / or its manufacturing method and use method.

Claims

1. A seat back having: A cushion body elastically supports a seated person; A seat frame supporting the seat cushion body from a seat back side; and The side airbag device is mounted on the outer side of the seat frame on one side in the seat width direction and includes an airbag that bulges forward of the seat. The cushion body comprises: The seat pad becomes the cushion part; a seat cover covering the seat cushion; and The support member is provided in a manner extending in a planar manner along the seat back side surface of the seat cushion, that is, the back side of the cushion, and is responsible for planar support of the seat cushion from the seat back side, fixing the end of the seat cover and fixing it to the seat frame. The seat cushion body is arranged in a manner to cover the side airbag device from the front of the seat. The support member has an opening portion that opens a deployment region of the airbag that bulges forward of the seat.

2. The seat back according to claim 1, wherein: The seat cushion body is composed of three divided elements, namely, a main pad constituting a central portion in the seat width direction and side pads constituting two side portions in the seat width direction. The support member has a side support portion provided on one of the side pads provided so as to cover the side airbag device from the front of the seat and supporting a body of a seated person from an oblique side via the seat pad.

3. The seat back according to claim 1 or 2, wherein: The seat back also has a lining fabric, The lining cloth is arranged in a manner of covering the side airbag device from behind the seat, and each end of the front end after covering passes from the opening of the support component through the slit of the seat pad that constitutes the deployment path of the airbag and is sewn to the sewn ends of each cover piece of the seat cover that will be broken by the deployment pressure of the airbag.

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