Seat back

Abstract

To provide a seat back with a side air bag device improving an assembly property of a back pad in a simple structure.SOLUTION: A seat back 2 includes: a side air bag device 40 provided with a back pad 20, a back frame 10, a back cover 30, and a side air bag 43 fitted to a side frame 11 of the back frame 10 expanded and deployed forward a seat while passing through a pad through hole 26 formed at the back pad 20 and rupturing a sewing part 35 of the back cover 30; a webbing 50 sewn with the ruptured / sewn part 35 and passed between the back pad 20 and the side frame 11 so as to guide a deployment path of the side air bag 43 through the pad through hole 26; and a cloth member 60 fitted to the pad rear surface of the back pad 20 and having a space S through which the webbing 50 can be passed along the pad rear surface.SELECTED DRAWING: Figure 3

Description

[[Technical Field]]

[0001] The present invention relates to a seat back. More specifically, the present invention relates to a seat back provided with a side airbag device attached to a side frame. [[Background Art]]

[0002] Patent Document 1 discloses a seat back provided with a side airbag device. The side airbag device is fixed to the side frame and provided so as to be covered from the front side by a back pad. The back pad has a pad through-hole penetrating in the front-rear direction. A back cover that covers the back pad has a breakable stitched fracture portion that is easily broken at a position facing the front end of the pad through-hole. The side airbag of the side airbag device deploys out of the seat from the fractured stitched portion of the back cover through the pad through-hole of the back pad.

[0003] The seat back has two reinforcing cloths that guide the deployment path of the airbag. The two reinforcing cloths are sewn to the fractured stitched portion, extend through the pad through-hole, and extend along the back surface of the back pad. The two reinforcing cloths are attached to the side frame so as to cover the side airbag device from the inner side and the outer side in the seat width direction. [[Prior Art Documents]] [[Patent Documents]]

[0004] [[Patent Document 1]] Japanese Patent No. 6254643 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0005] The back pad is assembled to the side frame with a back cover that has two reinforcing fabric pieces sewn onto it beforehand. At this time, the two reinforcing fabric pieces need to be arranged in two separate routes relative to the side airbag device: one passing through the inside and the other through the outside. However, there is a risk of incorrect assembly due to uneven placement. Therefore, we provide a seat back with a side airbag device that can suppress incorrect assembly of the reinforcing fabric pieces with a simple configuration. [Means for solving the problem]

[0006] To solve the above problems, the seat back of the present invention employs the following means.

[0007] In other words, the seat back of the present invention comprises a back pad that elastically supports the load of a seated person, a back frame that supports the back pad from the back side of the pad, a back cover that covers the back pad from the front side of the pad, an airbag device attached to a side frame which is the side of the back frame, a side airbag device which includes a side airbag that inflates and deploys forward of the seat while rupturing the broken seam portion which is the joint of the back cover through a pad through hole formed in the back pad, a reinforcing fabric that is sewn to the broken seam portion and passed between the back pad and the side frame so as to guide the deployment path of the side airbag through the pad through hole, and a planar member attached to the back surface of the back pad and having a passage that allows the reinforcing fabric to pass along the back surface of the pad.

[0008] By passing the reinforcing fabric through the opening in this way, the fabric is more easily held in place along the back of the pad. As a result, the reinforcing fabric can be properly positioned to pass between the back pad and the side frame.

[0009] Furthermore, the seat back of the present invention may be configured as follows: The planar member is provided so as to be sandwiched between the frame edge of the side frame and the back surface of the pad. Therefore, the planar member can protect the back surface of the pad from the frame edge. In other words, the planar member can rationally position the reinforcing fabric and protect it from the frame edge.

[0010] Furthermore, the seat back of the present invention may be configured as follows: The reinforcing fabric is formed in a loop shape that encloses the side airbag device and the side frame together. This makes it easier for the reinforcing fabric to guide the side airbag toward the ruptured seam, and allows the deployment pressure of the side airbag to be appropriately applied to the ruptured seam.

[0011] Furthermore, the seat back of the present invention may be configured as follows: The passage is a slit-shaped gap formed between the planar member and the back surface of the pad at a position inward in the seat width direction from the side airbag device. The reinforcing fabric has an inner reinforcing fabric, one end of which is sewn to the broken seam and extends through the through-hole to pass through the gap, and an outer reinforcing fabric, the other end of which is sewn to the broken seam and extends to cover the outer surface of the back pad. The other ends of the inner and outer reinforcing fabrics are joined together. As a result, the reinforcing fabric is formed in a loop shape so as to cover the outer surface and back surface of the back pad. Therefore, when the side airbag is deployed, the reinforcing fabric is widely supported not only by the side frame but also by the outer surface and back surface of the back pad. As a result, the reinforcing fabric can more easily guide the side airbag toward the broken seam.

[0012] Furthermore, the seat back of the present invention may be configured as follows: The back pad has a rear pad portion that wraps around from the outside in the seat width direction so as to cover the outer circumference of the side frame up to the rear end. The rear pad portion has a pad extension portion that extends inward in the seat width direction beyond the side frame. The reinforcing fabric is provided so as to pass inward in the seat width direction beyond the pad extension portion. This prevents contact between the reinforcing fabric and the side frame and protects the reinforcing fabric. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view of the seat back according to the first embodiment. [Figure 2] This is a front view of the seatback. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 2. [Figure 4] This is a disassembled view of the seat back. [Figure 5] This is an enlarged view of section V in Figure 3. [Figure 6] This is a side view of the seatback. [Modes for carrying out the invention]

[0014] The embodiments for carrying out the present invention will be described below with reference to Figures 1 and 6. In the following description, when directions such as front, back, up, down, left, and right are indicated, they refer to the respective directions shown in each figure. Also, when "sheet width direction" is indicated, it refers to the left and right direction of sheet 1, which will be described later.

[0015] <First Embodiment> This embodiment is an example of applying the present invention to a car seat 1. As shown in Figure 1, the seat 1 has a seat back 2 that forms the backrest and a seat cushion 3 that forms the seating area. The seat cushion 3 is a well-known component, so its description will be omitted, and the seat back 2 will be described.

[0016] <Seatback 2> As shown in Figure 2, the seat back 2 has a frame-shaped back frame 10 that forms its skeleton, a back pad 20 that is assembled to the front of the back frame 10, and a back cover 30 that is placed over the back pad 20 from the front. The seat back 2 also has side airbag devices 40 on both its left and right sides. Each side airbag device 40 has a substantially symmetrical configuration with substantially the same basic structure. Below, the left side airbag device 40 of the seat back 2 will be described as a representative example. As shown in Figure 3, the side airbag device 40 is located on the back of the back pad 20. In the event of a side collision of a vehicle, the side airbag 43 built into the side airbag device 40 deploys to the front of the seat back 2 to protect the occupant from the collision.

[0017] As shown in Figure 3, the side airbag 43 deployed from the side airbag device 40 inflates to spread forward through the pad through-hole 26 of the back pad 20. The deployment pressure during inflation causes the side airbag 43 to rupture the seam 35 of the back cover 30. The side airbag 43 then inflates to the outside of the seat back 2 through the ruptured seam 35. The seat back 2 has a strip-shaped reinforcing cloth 50 that facilitates the transmission of the deployment pressure of the side airbag 43 to the seam 35. The reinforcing cloth 50 is sewn to the seam 35 and is arranged to surround the side airbag device 40 from all sides. The tension of the reinforcing cloth 50 due to the inflation of the side airbag 43 promotes the rupture of the seam 35. The reinforcing cloth 50 also guides the side airbag 43 so that it deploys toward the ruptured seam 35. Here, the seam 35 corresponds to the "ruptured seam" of the present invention.

[0018] As shown in FIG. 5, a planar cloth member 60 is provided to extend across between the side airbag apparatus 40 and the back surface material 24 of the back pad 20, and between the side frame 11 and the back surface material 24. As shown in FIG. 6, the cloth member 60 is sewn to the back surface material 24 at its upper portion and lower portion. Thereby, the cloth member 60 forms a slit-shaped gap S between itself and the back surface material 24 (see FIG. 5). The reinforcing cloth 50 is disposed so as to pass through this gap S. Therefore, the cloth member 60 can position the reinforcing cloth 50 so as to be disposed at an appropriate position, and hold the disposed reinforcing cloth 50 so as not to be displaced.

[0019] <back frame 10> Hereinafter, each configuration of the seat back 2 described above will be described in detail. As shown in FIG. 2, the back frame 10 is made of metal with excellent rigidity, and is a substantially rectangular frame member in front view. The back frame 10 has vertically elongated plate-shaped side frames 11 forming side skeletons on both left and right sides, a horizontally elongated plate-shaped upper frame 12 forming an upper skeleton, and a horizontally elongated plate-shaped lower frame 13 forming a lower skeleton. The upper frame 12 is bridged between upper portions of the respective side frames 11. The lower frame 13 is bridged between lower portions of the respective side frames 11. Each side frame 11 has reclining plates 14 connected to the seat cushion 3 on both left and right outer sides of the lower portion thereof.

[0020] As shown in Fig. 2, each side frame 11 is arranged separately on the left side and the right side of the seat back 2. Each side frame 11 has a substantially symmetrical configuration with substantially the same basic configuration as each other. Hereinafter, the side frame 11 on the left side of the seat back 2 will be described as a representative. As shown in Fig. 3, the side frame 11 has a U-shaped cross-section that opens toward the right direction (the inner side in the seat width direction) in a top view. The side frame 11 includes a thin plate-shaped front portion 11a and a rear portion 11b extending in the left-right direction, and a side portion 11c connecting the left end portions of the front portion 11a and the rear portion 11b in the front-rear direction. The front portion 11a is formed to have a shorter length in the left-right direction than the rear portion 11b. A side airbag device 40 is assembled to the side portion 11c. The side airbag device 40 is arranged on the left side of the side portion 11c (the outer side in the seat width direction).

[0021] <Side airbag device 40> As shown in Fig. 2, each side airbag device 40 is a substantially cubic member that is elongated in the vertical direction. As shown in Fig. 3, the side airbag device 40 includes a main body case 41 that accommodates an unexpanded side airbag 43 and a gas supply device (not shown) that supplies gas to the side airbag 43. The main body case 41 is assembled to the side portion 11c of the side frame 11 by a fastening portion 42 such as a bolt and a nut.

[0022] As shown in Fig. 3, the side airbag 43 is a bag body that expands by the inflow of gas. A gas generating agent or high-pressure gas is sealed in the gas supply device. When a vehicle collides, the gas supply device is activated by the impact of the collision. Then, the side airbag 43 in the side airbag device 40 expands due to the supply of gas. The imaginary lines in Fig. 3 and Fig. 6 show the side airbag 43 that has expanded and deployed in front of the seat back 2. The side airbag device 40 also includes a harness and a connector (not shown) necessary for forming a circuit configuration with related devices such as an impact sensor.

[0023] <Back pad 20> As shown in Figure 2, the back pad 20 is a substantially rectangular member when viewed from the front. The back pad 20 is made of foamed resin such as polyurethane foam. The back pad 20 is assembled to cover the back frame 10 from all sides. As shown in Figure 3, the back pad 20 has a pad top surface 21 that forms the front, a pad frame surface 22 that forms the side, and a pad rear surface 23 that forms the rear. The back pad 20 also has a back material 24 that faces the side frame 11 and the side airbag device 40. The back material 24 is integrally molded along the back surface of the back pad 20. The back pad 20 has a pad rear portion 27 that covers the side frame 11 and the side airbag device 40 from behind. The pad rear portion 27 has a pad extension portion 27a that extends inward in the seat width direction beyond the frame edge 11e, which is the tip of the rear portion 11b of the side frame 11. The pad extension portion 27a has an oblique extension shape that extends forward as it extends inward in the seat width direction. As a result, the front end of the pad extension portion 27a is positioned in front of the front end of the frame edge 11e. Furthermore, the pad extension portion 27a is spaced apart from the rear cover portion 34 of the back cover 30 to create a gap in the front-rear direction.

[0024] As shown in Figures 1 and 2, the pad top surface 21 has a main top surface portion 21a that supports the seated person's back from behind, and side top surface portions 21b located on both the left and right outer sides of the main top surface portion 21a. Each side top surface portion 21b has a convex shape that protrudes forward from the main top surface portion 21a. As a result, each side top surface portion 21b supports the seated person's back from both the left and right sides. As shown in Figure 3, linear recessed suspension grooves 25 are formed on the left and right edges of the main top surface portion 21a along the boundary with each side top surface portion 21b. The back pad 20 also has pad through holes 26 that extend from each side top surface portion 21b through the back pad 20 to the back material 24.

[0025] <Back cover 30> As shown in Figure 1, the back cover 30 is a bag-shaped member formed by sewing together multiple cover pieces. The back cover 30 is placed over the back pad 20 so as to cover the outer periphery. As shown in Figure 3, the back cover 30 has a main cover portion 31 that covers the main top portion 21a, side cover portions 32 that cover each top portion side portion 21b, a frame surface cover portion 33 that covers the pad frame surface 22, and a rear surface cover portion 34 that covers the pad rear surface 23. At the boundary between the main cover portion 31 and each side cover portion 32, a seam allowance (not shown) that is folded backward is formed. The seam allowance is suspended and secured in the suspension groove 25 of the back pad 20. As a result, the main cover portion 31 and each side cover portion 32 are stretched tightly against the pad top surface 21 without causing any gaps or wrinkles. The back cover 30 also has a seam 35 where the side cover portion 32 and the frame cover portion 33 are sewn together.

[0026] <Rikifu 50> As shown in Figure 3, the reinforcing fabric 50 has an inner reinforcing fabric 51 that extends along the backing material 24 through the pad through hole 26, and an outer reinforcing fabric 52 that extends along the pad frame surface 22 and the pad rear surface 23. One end of the inner reinforcing fabric 51 and the outer reinforcing fabric 52 are integrally sewn together to the seam 35 of the back cover 30. The other ends of the inner reinforcing fabric 51 and the outer reinforcing fabric 52 are joined to each other by a wire fastener 53. As a result, the reinforcing fabric 50 becomes a loop-shaped member in which two strip-shaped members are joined endlessly. Here, the pad frame surface 22 and the pad rear surface 23 correspond to the "outer surface" of the present invention.

[0027] As shown in Figure 3, the inner reinforcing fabric 51 is positioned to extend to the right side (inward in the seat width direction) passing through the front of the side airbag device 40. The inner reinforcing fabric 51 is then passed through the gap S between the fabric member 60 and the backing material 24. The inner reinforcing fabric 51 straddles the side airbag device 40 and the side frame 11 front to back, and its other end passes to the right of the pad extension 27a and wraps around to the rear surface 23 of the pad. By passing the inner reinforcing fabric 51 to the right of the pad extension 27a, the inner reinforcing fabric 51 is less likely to come into contact with the frame edge 11e. The other end of the inner reinforcing fabric 51 that wraps around to the rear surface 23 of the pad is connected to the other end of the outer reinforcing fabric 52. As a result, the reinforcing fabric 50 is positioned to surround the side airbag device 40, the side frame 11, the pad frame surface 22, and the rear surface 23 of the pad from the front, back, left, and right. When the side airbag 43 inflates toward the front of the seat, the deployment pressure pulls the reinforcing fabric 50 primarily toward the front of the seat. The reinforcing fabric 50, pulled toward the front, is supported by the rear surface 23 of the pad and the side frame 11 that supports the rear surface 23 of the pad.

[0028] <Cloth member 60> As shown in Figure 3, the seat back 2 has a fabric member 60 disposed between the side frame 11 and the inner reinforcing fabric 51. The fabric member 60 is made of a nonwoven fabric such as felt. As shown in Figure 6, the fabric member 60 is a vertically elongated planar member that extends along the height direction of the seat back 2. As shown in Figure 5, the fabric member 60 is provided so as to face the frame edge 11d, which is the tip of the front part 11a of the side frame 11. This prevents the fabric member 60 from contacting the frame edge 11d and the inner reinforcing fabric 51. As a result, the fabric member 60 can protect the inner reinforcing fabric 51 and the backing material 24 from being damaged by the frame edge 11d. Also, as shown in Figure 3, the right end of the fabric member 60 (the inner end in the seat width direction) is provided so as to be to the right (inside in the seat width direction) of the frame edge 11e of the side frame 11. This makes it less likely for the inner reinforcing fabric 51 passing through the gap S between the fabric member 60 and the backing material 24 to come into contact with the frame edge 11e.

[0029] As shown in Figure 6, the upper and lower parts of the fabric member 60 are sewn to the backing material 24, respectively (upper sewing portion 61, lower sewing portion 62). The backing material 24 is integrally molded with the back pad 20 with the fabric member 60 already sewn to it. The upper sewing portion 61 and the lower sewing portion 62 assemble the fabric member 60 to the back pad 20. The central portion 63 between the upper sewing portion 61 and the lower sewing portion 62 of the fabric member 60 is configured to float relative to the backing material 24. As a result, as shown in Figure 5, a slit-shaped gap S is formed between the central portion 63 of the fabric member 60 and the backing material 24. The inner reinforcing fabric 51 is arranged to pass through this gap S in the front-to-back direction along the backing material 24. Here, the gap S corresponds to the "through opening" of the present invention.

[0030] <Assembly procedure for seat back 2> The seat back 2 is assembled by combining the above-described components as follows. First, as shown in Figure 4, the back cover 30 is attached to the foam-molded back pad 20. The back cover 30 has the reinforcing fabric 50 sewn onto it beforehand. Next, the inner reinforcing fabric 51 is passed through the pad through hole 26 and then through the gap S between the fabric member 60 and the back material 24. The outer reinforcing fabric 52 is then positioned along the pad frame surface 22 and the pad rear surface 23. Then, as shown in Figure 3, the back pad 20 is attached to the side frame 11. This positions the inner reinforcing fabric 51 so that it passes through the side airbag device 40 and the right side (inside in the seat width direction) of the side frame 11. The other ends of the inner reinforcing fabric 51 and the outer reinforcing fabric 52 are then integrally joined together by a wire fastener 53. This forms the reinforcing fabric 50 in a loop shape so that it continuously surrounds the side airbag device 40 and the side frame 11.

[0031] To summarize, the seat back according to the first embodiment has the following configuration. In the following, the reference numerals in parentheses correspond to the respective components shown in the above embodiment.

[0032] In other words, the seat back (2) comprises a back pad (20) that elastically supports the weight of the seated person, a back frame (10) that supports the back pad (20) from the back side of the pad, a back cover (30) that covers the back pad (20) from the front side of the pad, and an airbag device (40) attached to the side frame (11) which is the side of the back frame (10), and through the pad through hole (26) formed in the back pad (20) to the break seam (35) which is the seam of the back cover (30). The side airbag device (40) includes a side airbag (43) that inflates and deploys in front of the seat while rupturing the rupture seam (35), a reinforcing cloth (50) that is sewn to the rupture seam (35) and passed between the back pad (20) and the side frame (11) to guide the deployment path of the side airbag (43) through the pad penetration hole (26), and a planar member (60) that is attached to the back surface of the back pad (20) and has a passage (S) that allows the reinforcing cloth (50) to pass along the back surface of the pad.

[0033] As the reinforcing fabric (50) passes through the opening (S) in this way, it becomes easier to position the reinforcing fabric (50) in the predetermined location, thus suppressing incorrect assembly. This makes it easier for the reinforcing fabric (50) to properly guide the deployment path of the side airbag (43). In this way, incorrect assembly of the reinforcing fabric (50) can be suppressed with a simple configuration.

[0034] Furthermore, the planar member (60) is positioned opposite the frame edge (11d) of the side frame (11). Therefore, the planar member (60) can protect the back surface of the pad and the reinforcing fabric (50) from the frame edge (11d). The planar member (60) can rationally serve as both a positioning part for the reinforcing fabric (50) and a protective part from the frame edge (11d).

[0035] Furthermore, the reinforcing fabric (50) is formed in a loop shape that continuously surrounds the side airbag device (40) and the side frame (11). As a result, the reinforcing fabric (50) can more easily guide the side airbag (43) toward the ruptured seam (35), and the deployment pressure of the side airbag (43) can be suppressed from being applied to areas other than the ruptured seam (35).

[0036] Furthermore, the through-hole (S) is a slit-shaped gap (S) formed between the planar member (60) and the back surface of the pad at a position inward in the seat width direction from the side airbag device (40). The reinforcing fabric (50) has an inner reinforcing fabric (51) which extends through the through-hole to pass through the gap (S) at one end sewn to the broken seam (35), and an outer reinforcing fabric (52) which extends to cover the outer surfaces (22, 23) of the back pad (20) at one end. The other ends of the inner and outer reinforcing fabrics are joined together. As a result, the reinforcing fabric (50) is formed in a loop shape spanning the outer surfaces (22, 23) and the back surface of the back pad (20). Therefore, when the side airbag (43) is deployed, the reinforcing fabric (50) is widely supported not only by the side frame (11) but also by the outer surfaces (22, 23) and the back surface of the back pad (20). This makes it easier for the reinforcing fabric (50) to guide the side airbag (43) toward the ruptured seam (35).

[0037] Furthermore, the back pad (20) has a pad rear portion (27) that wraps around from the outside in the seat width direction so as to cover the outer circumference of the side frame (11) up to the rear end. The pad rear portion (27) has a pad extension portion (27a) that extends inward in the seat width direction beyond the side frame (11). The reinforcing fabric (50) is provided so as to pass inward in the seat width direction beyond the pad extension portion (27a). This prevents contact between the reinforcing fabric (50) and the side frame (11) and protects the reinforcing fabric (50).

[0038] <Other Embodiments> Although the present invention has been described above using one embodiment, the present invention can be implemented in various forms other than those described above.

[0039] 1. Seatbacks can be widely applied not only to automobile seats, but also to seats used in various vehicles other than automobiles, such as trains, aircraft, and ships, as well as seats used in public facilities such as movie theaters and in homes.

[0040] 2. The reinforcing fabric may have an inner reinforcing fabric that passes through the pad through-hole and is on the inside in the seat width direction relative to the side airbag device, and an outer reinforcing fabric that passes through the pad through-hole and is on the outside in the seat width direction relative to the side airbag device. The reinforcing fabric may also have a configuration that has only an inner reinforcing fabric. The inner reinforcing fabric may also have a configuration that passes through the pad through-hole and is on the outside in the seat width direction relative to the side airbag device. In that case, the planar member may be provided at a position on the outside in the seat width direction relative to the side airbag device, and the inner reinforcing fabric may be passed between the planar member and the back surface of the pad. The reinforcing fabric may also have a configuration in which two or more strip-shaped members are provided intermittently.

[0041] 3. The planar member may be provided at any location on the back surface of the pad. The planar member may be provided on the back surface of the pad by sewing or by fastening members such as hook-and-loop fasteners. The planar member may be made of resin. The planar member may be configured as the backing material of the back pad. In that case, a slit such as a cut formed in the backing material may be used as a passage. The passage is shown as a gap between the planar member and the back surface of the pad. Alternatively, it may be configured as a slit formed in the planar member. [Explanation of symbols]

[0042] 1 sheet 2 seatbacks 3 Seat cushions 10 Backframe 11 Side Frames 11a front 11b Rear 11c Side 11d Frame Edge 11e Frame Edge 12 Upper Frame 13 Lower Frame 14 Reclining Plates 20 Backpads 21 Pad top surface 21a Main section of the top panel 21b Top panel side section 22 Pad frame surface (outer surface) 23. Rear (outer) side of the pad 24 Backing material 25 Hanging groove 26 pad through holes 27 Rear pad 27a Pad extension 30 Back cover 31 Main cover section 32 Side cover section 33 Frame surface cover part 34 Rear cover section 35. Suture site (rupture suture site) 40. Side airbag system (airbag system) 41 Main unit case 42 Fastening part 43 Side airbags 50 Rikifu 51 Inner force cloth 52 Outer force cloth 53-line fastener 60 Fabric members (surface members) 61 Upper sewing part 62 Lower sewing part 63 Central part S Gap (opening)

Claims

1. It is a seat back, A back pad that elastically supports the weight of the seated person, A back frame that supports the back pad from the back of the pad, A back cover that covers the aforementioned back pad from the front side of the pad, An airbag device attached to the side frame, which is the side of the back frame, comprising a side airbag that inflates and deploys forward of the seat by passing through a pad through hole formed in the back pad and rupturing the broken seam portion, which is the joint of the back cover, and A reinforcing fabric is sewn to the broken seam and passed between the back pad and the side frame so as to guide the deployment path of the side airbag through the pad penetration hole, The back pad has a planar member attached to the back surface of the pad, which has a passage opening through which the reinforcing fabric can be passed along the back surface of the pad, The planar member is a seat back provided so as to be sandwiched between the frame edge of the side frame and the back surface of the pad.

2. A seat back, A back pad that elastically supports the weight of the seated person, A back frame that supports the back pad from the back of the pad, A back cover that covers the aforementioned back pad from the front side of the pad, An airbag device attached to the side frame, which is the side of the back frame, comprising a side airbag that inflates and deploys forward of the seat by passing through a pad through hole formed in the back pad and rupturing the broken seam portion, which is the joint of the back cover, and A reinforcing fabric is sewn to the broken seam and passed between the back pad and the side frame so as to guide the deployment path of the side airbag through the pad penetration hole, A planar member attached to the back surface of the back pad, having a passage opening through which the reinforcing fabric can be passed along the back surface of the pad, The reinforcing fabric is formed in a loop shape that surrounds the side airbag device and the side frame together. The aforementioned passage opening is a slit-shaped gap formed between the planar member and the back surface of the pad at a position inward in the seat width direction from the side airbag device. The reinforcing fabric comprises an inner reinforcing fabric, one end of which is sewn to the broken seam and extends through the pad through-hole to pass through the gap, and an outer reinforcing fabric, one end of which is sewn to the broken seam and extends to cover the outer surface of the back pad. A seat back in which the other ends of the inner reinforcing fabric and the outer reinforcing fabric are joined together.

3. A seat back according to claim 2, The back pad has a rear portion that wraps around the outer circumference of the side frame from the outside in the seat width direction so as to cover the rear end, The rear portion of the pad has a pad extension that extends inward in the seat width direction beyond the side frame, A seat back in which the reinforcing fabric is provided so as to pass inside the seat width direction of the pad extension.

Images