Vehicle seat

Abstract

To provide a vehicle seat equipped with a side airbag device capable of inflating and deploying an airbag in a more stable state.SOLUTION: The vehicle seat includes a seat back 2 and a side airbag device 40 attached to a side 2B of a side portion of the seat back 2. The seat back 2 includes a back frame 20 having a side frame 21, and a side support member 30 attached to a front portion of the side frame 21 and protruding toward a seat front side with respect to the side frame 21. The side airbag device 40 includes a first airbag 42 that inflates on the outer surface side of the side frame 21, and a second airbag 43 that inflates on the inner surface side of the side frame 21. The second airbag 43 passes through the gap G formed between the side frame 21 and the side support member 30 in the seat front-rear direction, and expands on the inner surface side of the side frame 21.SELECTED DRAWING: Figure 4B

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat equipped with a side airbag device for absorbing impacts applied from the side of the vehicle. [Background technology]

[0002] BACKGROUND ART Conventionally, vehicle seats equipped with side airbag devices that are attached to the side portions of the seat back in the seat width direction and that cushion impacts applied from the side of the vehicle are known (see, for example, Patent Document 1).

[0003] The vehicle seat described in Patent Document 1 includes a seat back and a side airbag device attached to a side portion of the seat back. The seat back has a back frame having side frames disposed on the left and right sides in the seat width direction, and the side airbag device has an airbag module attached to the outer surfaces of the side frames. The airbag module has a first airbag that inflates and deploys on the outer surface of the side frame, a second airbag that inflates and deploys on the inner surface of the side frame, and an inflator that supplies gas to the inside of the first airbag and the second airbag. By providing the first airbag and the second airbag as described above, it is possible to quickly restrain an occupant (a person seated in a vehicle seat) in the initial stage of inflation and deployment of the airbags. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 138954 Summary of the Invention [Problem to be solved by the invention]

[0005] In a vehicle seat equipped with a side airbag device such as that disclosed in Patent Document 1, it has been desired to restrain a seated occupant more quickly and efficiently by inflating and deploying the airbag in a more stable manner. More specifically, in a vehicle seat equipped with a side airbag device having a first airbag that inflates and deploys on the outer surface side of the side portion of the seat bag and a second airbag that inflates and deploys on the inner surface side of the side portion, there has been a demand for the second airbag in particular to inflate and deploy in a more stable manner.

[0006] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a vehicle seat equipped with a side airbag device that allows the airbag to inflate and deploy in a more stable manner. [Means for solving the problem]

[0007] The problem is to provide a vehicle seat including a seat back serving as a backrest, and a side airbag device attached to a lateral portion of the seat back in the seat width direction for absorbing an impact applied from the side of the vehicle, wherein the seat back includes a back frame having side frames disposed on the left and right sides in the seat width direction, and side support members attached to front portions of the side frames, protruding further forward than the side frames, for causing the side portions of the seat back to protrude forward of the seat, and the side support members extend elongatedly in the up-down direction along the side frames and are spaced apart from the side frames in the front-to-rear direction of the seat. and the side airbag device is arranged with a gap formed between them, the side airbag device includes an airbag module attached to one of the outer and inner sides of the side frame, the airbag module having a first airbag that inflates and deploys on the one side of the side frame, a second airbag that inflates and deploys on the other side of the side frame, and an inflator that supplies gas to the inside of the first airbag and the second airbag, and the second airbag passes through the gap formed between the side frame and the side support member in the seat front-rear direction, and inflates and deploys on the other side of the side frame. The above configuration makes it possible to realize a vehicle seat that allows the airbag to inflate and deploy in a more stable manner. Specifically, by further providing the side support member, the second airbag can pass through the gap formed between the side frame and the side support member in the seat front-rear direction and inflate and deploy on the other side surface of the side frame. This allows the second airbag to inflate and deploy in a more stable manner. As a result, the seated occupant can be restrained quickly and efficiently.

[0008] In this case, the side support members are linear members attached to the upper portion of the side frame and the lower portion of the side frame, respectively, and extend in a long length in the vertical direction; the airbag module is attached to the outer surface of the side frame; the first airbag inflates and deploys toward the front of the seat on the outer surface side of the side frame; and the second airbag passes through the gap formed between the side frame and the linear member and inflates and deploys toward the inside in the seat width direction on the inner surface side of the side frame. With this configuration, the second airbag can be stably deployed toward the inside of the seat width direction on the inner surface of the side frame, thereby more quickly and efficiently restraining the seated occupant.

[0009] In this case, the seat back is attached to the side of the side frame and is provided with a protective member that covers the side frame, and the protective member is preferably positioned so as to cover at least the front end portion and the rear end portion of the side frame. In addition, the side frame preferably has a frame main body portion extending in the fore-and-aft direction of the seat, a front flange portion continuing from the front end of the frame main body portion and protruding inward in the seat width direction, and a rear flange portion continuing from the rear end of the frame main body portion and protruding inward in the seat width direction, and the protective member is a flexible protective plate which has a plate main body portion covering the inner surface of the frame main body portion, a plate front portion continuing from the front end of the plate main body portion and folded back to cover the front flange portion, and a plate rear portion continuing from the rear end of the plate main body portion and folded back to cover the rear flange portion. In addition, the back frame preferably has an upper frame that connects the upper ends of the left and right side frames, and the seat back preferably has a second protective member that covers the portion of the upper frame that is connected to the upper ends of the side frames. As described above, by providing a protective member that protects the side frame (particularly the end portion of the side frame), it is possible to prevent the second airbag from unintentionally coming into contact with the side frame (the end portion of the side frame) when it is inflated and deployed, which allows the second airbag to inflate and deploy stably.

[0010] In this case, the seat back comprises a padding material placed on the front of the back frame, a skin material covering the back frame and the padding material, and a movable body provided on the side of the seat back, positioned between the side frame and the padding material in the seat fore-and-aft direction, and movable to cause the padding material to protrude toward the front of the seat at the side, and the movable body moves toward the front of the seat as the second airbag inflates and deploys, causing the padding material to protrude toward the front of the seat. In addition, it is preferable that the movable body has a rotating member that is attached so as to be rotatable relative to the side support member, rotates toward the front of the seat as the second airbag inflates and deploys, and causes the pad material to protrude toward the front of the seat. In addition, the pivoting member may be attached so as to be rotatable relative to the side support member, and may have a pivoting main body portion extending from the side support member toward the rear of the seat along the bottom surface of the pad material, and a protruding portion protruding from the front surface of the pivoting main body portion toward the pad material and abutting against the pad material. As described above, by providing a movable body (rotating body) that moves toward the front of the seat as the second airbag inflates and deploys, the deployment force of the second airbag can be efficiently transmitted to the pad material. As a result, the seated occupant can be restrained more quickly and efficiently.

[0011] In this case, the side airbag device may further include a guide member that guides the inflation and deployment of the second airbag, one end of the guide member being attached to the side frame or a mounting bracket attached to the side frame, and the other end of the guide member being attached to the movable body. In addition, the side airbag device may further include a guide member that guides the inflation and deployment of the second airbag, one end of the guide member being attached to a mounting bracket attached to a side surface of the side frame, and the other end of the guide member being attached to the second airbag, and the mounting bracket being provided on the inflator and fastened to the side frame by an assembly shaft that protrudes from the inflator in the seat width direction. The mounting bracket may be disposed more inward in the seat width direction than the side frame and may have a slit through which one end of the guide member is inserted for mounting. By providing the guide member as described above, it is possible to prevent the second airbag that has been inflated and deployed from slipping behind the side frame and behind the seat. Furthermore, by providing the mounting bracket as described above, the guide member can be stably mounted. Furthermore, since the mounting bracket is fastened together with the side frame by the assembly shaft that protrudes from the inflator in the seat width direction, the airbag module and the guide member can be stably mounted. Furthermore, since the mounting bracket has a slit, one end of the guide member can be easily mounted.

[0012] In this case, the seat back preferably includes a padding material that is placed on the front surface of the back frame, and a skin material that covers the back frame and the padding material, and the side airbag device preferably has a retainer member that holds the airbag module from the rear side of the seat, and the retainer member preferably has a rear wall portion that is placed on the seat rear side of the airbag module, and a side wall portion that is continuous with one end of the rear wall portion in the seat width direction and extends toward the front side of the seat along the side of the airbag module, and the side wall portion is provided on the skin material and extends toward the front side of the seat to a position that reaches or near the skin tearing portion that tears when the first airbag is inflated and deployed. The side airbag device also has a retainer member that holds the airbag module from the rear side of the seat, and the retainer member has a rear wall portion that is arranged on the seat rear side of the airbag module, a side wall portion that is arranged along the other side surface of the side frame, and a reinforcing portion that is attached to the rear surface of the rear wall portion and protrudes toward the rear of the seat, and the side wall portion is provided on the inflator and is fastened to the side frame by an assembly shaft that protrudes from the inflator in the seat width direction. By providing the retainer member as described above, the retainer member can effectively absorb the pressure caused by the inflation and deployment of the airbag, thereby stabilizing the inflation and deployment directions of the first airbag and the second airbag. In addition, the retainer member extends toward the front of the seat to a position at or near the skin tearing portion that tears when the first airbag deploys, allowing the pressure received by the retainer member to be efficiently transmitted to the skin tearing portion, causing the skin tearing portion to tear. Furthermore, since the retainer member is fastened together with the side frame by the assembly shaft that protrudes from the inflator in the seat width direction, the retainer member can be stably attached.

[0013] In this case, the side airbag device has a retainer member that holds the airbag module from the side of the seat, and the retainer member has a side wall portion that is arranged along the side surface of the side frame, a front wall portion that protrudes continuously from the front end of the side wall portion in the seat width direction and is arranged on the seat rear side of the second airbag when the second airbag is inflated and deployed, and a reinforcing portion that is attached to the rear surface of the front wall portion and protrudes toward the rear of the seat, and the side wall portion is provided on the inflator and is fastened to the side frame by an assembly shaft that protrudes from the inflator in the seat width direction. By providing the retainer member as described above, the retainer member can effectively absorb the pressure caused by the inflation and deployment of the second airbag, thereby stabilizing the direction in which the second airbag flares and deploys. Furthermore, since the retainer member has a reinforcing portion, the holding force of the retainer member can be efficiently increased.

[0014] In this case, it is preferable that the seat back comprises a padding material disposed on the front surface of the back frame, and a skin material covering the back frame and the padding material, the padding material being formed in a position forward of the airbag module in the side portion of the seat back and having a pad through-hole penetrating from the outer surface to the inner surface of the padding material, the skin material having a skin rupture portion on the outer surface of the side portion that ruptures when the first airbag inflates and deploys, and the side airbag device comprises a guide member that guides the inflation and deployment of the first airbag, one end of the guide member being attached to a front portion or an outer portion of the skin material in the side portion, extending continuously from one end of the guide member and passing through the pad through-hole formed in the outer surface of the padding material in the side portion, and the other end of the guide member passing through the pad through-hole formed in the inner surface of the padding material in the side portion and being attached to an inner portion of the skin material in the side portion. With the above-described configuration, the guide member can appropriately guide the padding that moves in association with the inflation and deployment of the airbag at the side portion of the seat back, thereby enabling the airbag to inflate and deploy more quickly. [Effects of the Invention]

[0015] According to the present invention, a vehicle seat can be realized that allows the airbag to inflate and deploy in a more stable manner, and can quickly and efficiently restrain an occupant seated in the vehicle seat. Furthermore, according to the present invention, the second airbag can be stably inflated and deployed on the inner surface side of the side frame toward the inside in the seat width direction. Furthermore, according to the present invention, the protective member can prevent the second airbag that has expanded and deployed from coming into contact with the side frame (the end of the side frame). Furthermore, according to the present invention, the deployment force of the second airbag can be efficiently transmitted to the pad material by the movable body, thereby making it possible to more quickly and efficiently restrain the seated occupant. Furthermore, according to the present invention, the guide member can prevent the deployed second airbag from slipping behind the side frame and behind the seat. Furthermore, according to the present invention, the guide member and the airbag module can be stably attached by the mounting bracket, and one end of the guide member can be easily attached. Furthermore, according to the present invention, the retainer member can effectively withstand the pressure caused by the inflation and deployment of the airbag. The pressure received by the retainer member can be transmitted to the skin tearing portion, allowing the skin tearing portion to tear efficiently. Furthermore, the retainer member can be stably attached. Furthermore, according to the present invention, the retainer member can effectively withstand the pressure caused by the inflation and deployment of the second airbag, and the reinforcing portion can efficiently increase the holding force of the retainer member. Furthermore, according to the present invention, the guide member can suitably guide the padding material that moves in association with the inflation and deployment of the airbag at the side portion of the seat back. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an external perspective view of a vehicle seat according to an embodiment of the present invention; [Figure 2] FIG. 2 is a perspective view showing a seat frame that serves as a framework. [Figure 3A] FIG. 2 is a side view showing a back frame, a side support member, and a side airbag device. [Figure 3B] 3B is a side view showing a state in which the airbag shown in FIG. 3A is inflated and deployed. FIG. [Figure 4A]FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Figure 4B] 4 is a cross-sectional view taken along line IV-IV in FIG. 1, showing a state in which the first airbag and the second airbag are inflated and deployed. FIG. [Figure 5] FIG. 4 is a side view showing the back frame, the side support members, and the protection member. [Figure 6] FIG. 10 is an external side view of a vehicle seat according to a second embodiment. [Figure 7A] FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6. [Figure 7B] 7 is a cross-sectional view taken along line VII-VII in FIG. 6, showing a state in which the first airbag and the second airbag are inflated and deployed. FIG. [Figure 8] FIG. 10 is a perspective view of the back frame as seen from the inside in the seat width direction, showing the back frame and the mounting bracket. [Figure 9] 10A and 10B are diagrams showing modified examples of the mounting bracket. [Figure 10] FIG. 10 is an external side view of a vehicle seat according to a third embodiment. [Figure 11A] 11 is a cross-sectional view taken along the line XI-XI in FIG. [Figure 11B] 11 is a cross-sectional view taken along the line XI-XI in FIG. 10, showing a state in which the first airbag and the second airbag are inflated and deployed. FIG. [Figure 12] FIG. 10 is an external side view of a vehicle seat according to a fourth embodiment. [Figure 13] 13 is a cross-sectional view taken along the line XIII-XIII in FIG. 12. [Figure 14] 13 is a cross-sectional view taken along the line XIII-XIII in FIG. 12, showing a modified example of the retainer member. [Figure 15] FIG. 10 is an external side view of a vehicle seat according to a fifth embodiment. [Figure 16] 16 is a cross-sectional view taken along line XVI-XVI of FIG. 15. [Figure 17] FIG. 10 is an external side view of a vehicle seat according to a sixth embodiment. [Figure 18] 18 is a cross-sectional view taken along the line XVIII-XVIII in FIG. 17. [Figure 19]FIG. 13 is an external side view of a vehicle seat according to a seventh embodiment. [Figure 20] 20 is a cross-sectional view taken along the line XX-XX in FIG. 19. [Figure 21] 20 is a cross-sectional view taken along the line XX-XX in FIG. 19, showing a modified example of the retainer member and the guide member. [Figure 22] FIG. 13 is an external side view of a vehicle seat according to an eighth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. This embodiment relates to an invention of a vehicle seat having a side airbag device on the side portion of the seat back, the seat back having a back frame with side frames and a side support member attached to the front portion of the side frame, the side airbag device having a first airbag that inflates and deploys on the outer surface side of the side frame and a second airbag that inflates and deploys on the inner surface side of the side frame, the main feature of which is that the second airbag passes through a gap formed between the side frame and the side support member in the front-to-rear direction of the seat and inflates and deploys on the inner surface side of the side frame. The side of the vehicle seat where the occupant sits relative to the seat back is the front side of the seat.

[0018] <First embodiment> First, a vehicle seat S1 of the first embodiment will be described with reference to FIGS. As shown in Figures 1 and 2, the vehicle seat S1 is a vehicle seat and includes a seat body having a seat cushion 1, a seat back 2, and a headrest 3, side support members 30 attached to the lateral portions of the seat back 2 in the seat width direction for holding the side portions of the seat back 2 protruding toward the front of the seat, and a side airbag device 40 attached to the lateral portions of the seat back 2 in the seat width direction for absorbing impacts applied from the side of the vehicle.

[0019] As shown in FIG. 1, the seat cushion 1 is a seating portion that supports the seated person from below, and is configured by placing a pad material 1a on a cushion frame 10 shown in FIG. 2, which serves as the skeleton, and covering it with a skin material 1b. The seat cushion 1 is composed of a central portion 1A located in the center of the seat width direction, and left and right side portions 1B (side bolster portions) located outside the central portion 1A in the seat width direction.

[0020] As shown in FIG. 1, the seat back 2 is a backrest portion that supports the back of a seated occupant from behind, and is configured by placing a pad material 2a on a back frame 20 shown in FIG. 2, which serves as the skeleton, and covering it with a skin material 2b. The seat back 2 is composed of a central portion 2A located in the center in the seat width direction, and left and right side portions 2B located outside the central portion 2A in the seat width direction. On the surface of the padding material 2a, left and right hanging grooves are formed extending in the vertical direction so as to separate the central portion 2A from the left and right side portions 2B.

[0021] As shown in FIG. 1, the headrest 3 is a head support that supports the head of a seated occupant from behind, and is configured by placing a pad material 3a on a pillar 3c that serves as a core material and covering it with a skin material 3b. A pillar mounting member 26 for mounting a pillar 3c that supports the main body of the headrest 3 is attached to the upper portion of the back frame 20.

[0022] As shown in Figure 2, the cushion frame 10 is a rectangular frame-like body and is mainly composed of cushion side frames 11 arranged on the left and right sides, plate-shaped pan frames 12 (mounting frames) mounted on the front end portions of each cushion side frame 11, a rear connecting frame 13 connecting the rear portions of each cushion side frame 11, and a plurality of support members 14 (elastic springs) hooked onto the pan frames 12 and the rear connecting frame 13 and extending in the fore-and-aft direction of the seat.

[0023] The cushion side frame 11 is a plate-shaped frame that is long in the front-rear direction of the seat. A reclining device 4 is attached to the rear portion of the cushion side frame 11, and a rail device 6 is attached to the lower portion of the cushion side frame 11 via a height link device 5.

[0024] As shown in Figure 2, the back frame 20 is a rectangular frame-like body and is mainly composed of side frames 21 arranged on the left and right sides, an inverted U-shaped upper frame 22 connecting the upper end portions of each side frame 21, a plate-shaped lower frame 23 connecting the lower end portions of each side frame 21, a plurality of wire members 24 (elastic wires) hooked onto each side frame 21 and extending in the seat width direction, and a support plate 25 held by the plurality of wire members 24 and supporting the seated occupant. The back frame 20 is attached to the center portion of the upper frame 22 in the seat width direction, and further includes a pillar attachment member 26 for attaching the pillar 3c of the headrest 3.

[0025] The side frame 21 is a sheet metal member that extends in the vertical direction and has a substantially C-shaped cross section, and its lower end portion is connected to the rear end portion of the cushion side frame 11 via the reclining device 4. The reclining device 4 allows the back frame 20 to rotate relative to the cushion frame 10.

[0026] Specifically, as shown in Figures 2 and 4A, the side frame 21 has a frame main body portion 21a extending in the fore-and-aft direction of the seat, a front flange portion 21b continuing from the front end of the frame main body portion 21a and protruding inward in the seat width direction, and a rear flange portion 21c continuing from the rear end of the frame main body portion 21a and protruding inward in the seat width direction. As shown in FIGS. 4A and 4B, a protection member 27 is attached to the inner surface of the side frame 21 to cover the side frame 21 from the inside in the seat width direction. As shown in FIG. 5, a second protective member 28 is attached to the lower end portion of the upper frame 22, which is connected to the upper end portion of the side frame 21, to cover the lower end portion from below.

[0027] The protective member 27 is a flexible protective plate that protects the side frame 21. As shown in Figures 4A and 4B, the protective member 27 has a plate main body portion 27a that covers the inner surface of the frame main body portion 21a, a plate front portion 27b that continues from the front end of the plate main body portion 27a and is folded back to cover the front flange portion 21b, and a plate rear portion 27c that continues from the rear end of the plate main body portion 27a and is folded back to cover the rear flange portion 21c. The second protective member 28 is a flexible protective cap that protects the upper frame 22, and is attached to the lower end of the pipe-shaped upper frame 22. The protective member 27 and the second protective member 28 function to prevent the airbag of the side airbag device 40 from coming into direct contact with the back frame 20 when the airbag is inflated and deployed.

[0028] As shown in FIG. 5, the protection member 27 is attached along the side frame 21 so as to be elongated in the vertical direction. The protection member 27 is disposed at a position overlapping (specifically, at the same position as) the side airbag device 40 in the vertical direction and the seat front-rear direction.

[0029] As shown in FIGS. 2, 3A and 3B, the side support members 30 are linear members (specifically, wire members) made of a metal material, and are attached to the left and right side frames 21 in front of the seat by welding. The side support members 30 are attached to the front surfaces of the side frames 21, protrude further forward than the side frames 21, and are members for causing the side portions 2B of the seat back 2 to protrude forward of the seat. As will be described in detail later, the side support member 30 functions to hold the side portion of the seat back 2 protruding toward the front of the seat, and also to inflate and deploy the airbag of the side airbag device 40 in a stable manner.

[0030] Specifically, the side support member 30 is mainly composed of a wire main body portion 31 extending longitudinally along the longitudinal direction of the side frame 21, and a wire extension portion 32 extending rearward from the upper end of the wire main body portion 31. The wire extension portion 32 is welded and fixed in a state in contact with the front surface of the upper part of the side frame 21, and the lower end portion of the wire main body portion 31 is welded and fixed in a state in contact with the front surface of the lower part of the side frame 21.

[0031] In the above configuration, as shown in Figures 2 and 3A, the side support member 30 extends longitudinally in the up-down direction along the side frame 21, and is disposed with a gap G formed between it and the side frame 21 in the seat front-rear direction. The side support member 30 is disposed at a position overlapping (specifically, at the same position as) the side airbag device 40 in the vertical direction and the seat front-rear direction.

[0032] As shown in Figures 1 to 3A and 3B, the side airbag device 40 is configured so that when an impact is applied from the side of the vehicle body, the folded airbags 42 and 43 inflate and deploy like balloons toward the front side of the seat. As shown in FIGS. 4A and 4B, the side airbag device 40 includes an airbag module 41 that is provided inside the pad material 2a in the side portion 2B of the seat back 2 and attached to the outer surface of the side frame 21.

[0033] The airbag module 41 is mainly composed of a first airbag 42 that inflates and deploys on the outer surface side of the side frame 21, a second airbag 43 that inflates and deploys on the inner surface side of the side frame 21, an inflator 44 that supplies gas to the inside of the first airbag 42 and the second airbag 43, and a harness (not shown) that is connected to the inflator 44 and supplies ignition power to the inflator 44. The harness is connected to a vehicle battery (not shown) disposed on the vehicle body.

[0034] As shown in FIGS. 4A and 4B, the first airbag 42 inflates and deploys on the outer surface of the side frame 21 toward the front of the seat. The second airbag passes through the gap G formed between the side frame 21 and the side support member 30, and inflates and deploys on the inner surface side of the side frame 21 toward the front of the seat and inward in the seat width direction. More specifically, the airbags 42, 43 are inflated and deployed by gas being supplied to the interior of the airbags 42, 43 from an inflator 44, which serves as a gas generating source.

[0035] The inflator 44 is a long, substantially cylindrical gas generating device, and is arranged so as to be long in the vertical direction. The inflator 44 has a plurality of assembly shafts 44a that protrude inward in the seat width direction from the outer surface thereof and are assembled to the side frames 21. In addition, the inflator 44 further has an airbag connection portion (not shown) that protrudes from its outer surface and is connected to the inside of the airbag 11, and a harness connection portion (not shown) that is formed on the outer surface of the inflator 44 and is connected to a harness.

[0036] The multiple assembly shafts 44a are arranged at intervals in the vertical direction, and each passes through an assembly hole provided in the side frame 21 and an assembly hole provided in the protective member 27, and is fastened with an assembly nut 44b. In other words, the assembly shaft 44a tightens the side frame 21 and the protection member 27 together with the assembly nut 44b.

[0037] In the above configuration, as shown in FIGS. 4A and 4B, when the airbags 42, 43 are inflated and deployed, the pad material 2a is divided into an inner pad 2ab and an outer pad 2ac at the pad through-hole 2aa as a branching point and deployed. When the airbags 42, 43 are deployed, the skin 2b is separated into an inner skin 2bb and an outer skin 2bc at the skin tearing portion 2ba. The pad through-hole 2aa is a through-hole that penetrates the pad material 2a in the front-rear direction of the seat and is formed so as to be elongated in the up-down direction. Similarly, the skin tearing portion 2ba is formed to be elongated in the vertical direction. The pad through-hole 2aa and the skin tearing portion 2ba are formed in a position in front of the airbag module 41, and are arranged at a position overlapping with (specifically, at the same position as) the airbag module 41 in the seat width direction. This allows the airbag to inflate and deploy in a more stable manner.

[0038] In addition, in the above configuration, as shown in Figures 4A and 4B, the second airbag 43 passes through a gap G formed between the side frame 21 and the side support member 30 in the seat front-rear direction, and is configured to inflate and deploy on the inner surface side of the side frame 21. Therefore, the second airbag 43 can be deployed in a more stable state in front of the seat and inward in the seat width direction. That is, by using the side support member 30 as a guide member, it is possible to prevent, for example, the second airbag 43 from unintentionally deploying toward the front side of the seat.

[0039] In the above configuration, as shown in FIGS. 4A, 4B, and 5, a protection member 27 and a second protection member 28 are attached so as to cover the side frame 21 and the upper frame 22, respectively. In particular, the plate front portion 27b of the protective member 27 not only folds over and covers the tip of the side frame 21 (front flange portion 21b), but is also provided to cover the entire (almost entire) front surface of the front flange portion 21b. The plate rear portion 27c also folds back to cover the tip of the side frame 21 (rear flange portion 21c). Note that since it is not necessary to cover the entire rear surface of the side frame 21, it covers up to the periphery of the tip of the rear flange portion 21c. Therefore, it is possible to suitably prevent the second airbag 43 that has been inflated and deployed from unintentionally contacting the end of the side frame 21.

[0040] <<Others>> In the above embodiment, as shown in Figures 1 and 2, the side support member 30 and the side airbag device 40 are attached to the side portion 2B of the seat back 2, but this is not particularly limited and they may also be attached to the side portion 1B of the seat cushion 1.

[0041] In the above embodiment, as shown in FIG. 2, the side support members 30 are wire members made of a metal material, but this is not particularly limited and can be changed. The side support members 30 may be configured to support a seated occupant from the sides in the seat width direction, and may be, for example, plate-shaped members, rod-shaped members, movable plates, expandable bag members, or the like.

[0042] In the above embodiment, as shown in FIGS. 4A and 5, the protection member 27 is configured as a protection plate, but this is not particularly limited and can be modified. For example, the protective member 27 may be made up of a plurality of members, one for covering the front end of the side frame 21 and the other for covering the rear end of the side frame 21.

[0043] In the above embodiment, as shown in Figures 4A and 4B, the side airbag device 40 (airbag module 41) is attached to the outer surface of the side frame 21, but this is not particularly limited and it may also be attached to the inner surface of the side frame 21. In the above case, the first airbag 42 preferably inflates and deploys on the inner surface of the side frame, and the second airbag 43 preferably passes through the gap G formed between the side frame 21 and the side support member 30 and inflates and deploys on the outer surface of the side frame 21.

[0044] Second Embodiment Next, a vehicle seat S2 according to a second embodiment will be described with reference to FIGS. It should be noted that the description of the same content as that of the vehicle seat S1 described above will be omitted. As shown in Figures 6, 7A and 7B, the vehicle seat S2 comprises a seat body having a seat back 102, a side support member 130, a side airbag device 140, and a movable body 150 attached to a side portion 102B of the seat back 102 and causing the pad material 102a of the side portion 102B to protrude toward the front of the seat as the airbag inflates and deploys.

[0045] As shown in Figures 7A, 7B and 8, the side airbag device 140 includes an airbag module 141 having a first airbag 142, a second airbag 143 and an inflator 144, and a guide member 145 that guides the inflation and deployment of the second airbag 143.

[0046] The guide member 145 is a fabric member (weave) that guides the direction in which the second airbag 143 expands and deploys toward the front side of the seat and toward the inside in the seat width direction. The guide member 145 may be a strap. The guide member 145 has one end 145a attached to the front end of the side frame 121, extends continuously from the end 145a toward the rear of the seat, and is folded back near the rear end of the side frame 121, and the other end 145b of the guide member is attached to the rear end of the movable body 150.

[0047] 8, one end 145a of the guide member 145 is attached to a mounting bracket 146 attached to the inner surface of the side frame 121. Also, as shown in FIGS. 7A and 7B, the other end 145b of the guide member 145 is attached to the rear surface of the rear end of the movable body 150. The other end 145b may be attached with an adhesive or the like to the rear surface of the movable body 150. Alternatively, a resin trim cord (not shown) may be sewn to the other end 145b, and the other end 145b may be hooked onto the rear surface of the movable body 150 via the trim cord. The other end 145b may be attached to the tip of the second airbag 143. In that case, it is preferable that the other end 145b be attached to a position that becomes the rear surface of the tip of the second airbag 143 when the second airbag 143 is inflated and deployed.

[0048] As shown in FIG. 8, the mounting bracket 146 is a plate body having a generally J-shaped cross section, and is fastened together with the side frame 121 by an assembly shaft 144a that protrudes inward from the inflator 144 in the seat width direction. The mounting bracket 146 is disposed on the inner side of the side frame 121 in the seat width direction, and has a slit 146a through which one end 145a of the guide member 145 is inserted for mounting. The airbag module 141 and the guide member 145 can be stably attached by the attachment bracket 146. Also, one end of the guide member 145 can be easily attached. The mounting bracket 146 may be omitted, and one end 145a of the guide member 145 may be directly attached to the side frame 121 with adhesive or the like.

[0049] As shown in Figures 7A and 7B, the movable body 150 is a member that protrudes toward the front of the seat (from a normal position to a protruding position) as the second airbag 143 inflates and deploys, and is arranged between the side frame 121 and the pad material 102a in the front-to-rear direction of the seat. The movable body 150 is attached to the side support member 130 via an attachment portion 151 so as to be rotatable, and has a rotating member 152 that rotates toward the front of the seat as the second airbag 143 inflates and deploys, causing the pad material 102a to protrude toward the front of the seat.

[0050] The attachment portions 151 are hook-shaped members that are provided at intervals along the longitudinal direction of the side support member 130 and that clamp the side support member 130. The pivoting member 152 is pivotally attached to the side support member 130 and has a pivoting main body 152a extending from the side support member 130 toward the rear of the seat along the bottom surface of the pad material 102a, and a plurality of protrusions 152b (protruding ribs) that protrude from the front surface of the pivoting main body 152a toward the pad material 102a and abut against the pad material 102a. The rotating main body 152a is a plate body that extends longitudinally in the vertical direction, and the multiple protrusions 152b are arranged at intervals along the longitudinal direction of the rotating main body 152a.

[0051] By providing the guide member 145 as described above, the second airbag 143 that has been inflated and deployed can be prevented from slipping behind the side frame 121 behind the seat. Furthermore, by providing the movable body 150 as described above, the deployment force of the second airbag 143 can be efficiently transmitted to the pad material 102a, thereby making it possible to restrain the seated occupant more quickly and efficiently.

[0052] <<Others>> In the above embodiment, as shown in Figures 7A and 7B, the movable body 150 protrudes toward the front side of the seat as the second airbag 143 inflates and deploys, and efficiently transmits the deployment force of the second airbag 143 to the pad material 102a. In this case, a pad high hardness portion having a harder hardness than the pad material 102a may be provided on the back surface of the pad material 102a in a portion facing the movable body 150 (rotating member 152). For example, the high hardness portion of the pad is preferably integrally molded with the pad material 102 a and located in a portion that is directly pressed by the movable body 150 . This allows the movable body 150 to transmit the deployment force of the second airbag 143 to the pad material 102a more efficiently.

[0053] In the above embodiment, as shown in FIG. 8, the mounting bracket 146 is attached to the inner surface of the side frame 121, but this is not particularly limited and can be modified. 9, the mounting bracket 146 may be attached to the outer surface of the side frame 121. Alternatively, the mounting bracket 146 may be attached to the front surface of the side frame 121.

[0054] <Third embodiment of vehicle seat> Next, a vehicle seat S3 according to a third embodiment will be described with reference to FIGS. 10 to 11A and 11B. It should be noted that the description of the same contents as those of the vehicle seats S1 to S2 described above will be omitted. The vehicle seat S3 comprises a seat body having a seat back 202, a side support member 230, a side airbag device 240, and a movable body 250 attached to a side portion 202B of the seat back 202, which causes the pad material 202a of the side portion 202B to protrude toward the front of the seat as the airbag inflates and deploys.

[0055] As shown in Figures 11A and 11B, the side airbag device 240 includes an airbag module 241 having a first airbag 242, a second airbag 243, and an inflator 244, and a guide member 245 that guides the inflation and deployment of the second airbag 243. The airbag module 241 is attached to the outer surface of the side frame 221. More specifically, an assembly shaft 244a of the inflator 244 passes through the side frame 221 and is fastened to an assembly nut 244b.

[0056] The guide member 245 is a webbing that guides the direction in which the second airbag 243 expands and deploys, and may be a strap. A ring-shaped attachment member 246 is attached to one end 245a of the guide member 245. The ring-shaped mounting member 246 is inserted into a mounting groove 244c (mounted portion) formed on the outer surface of the assembly nut 244b, and is connected to the assembly nut 244b. With the above configuration, one end 245a of the guide member 245 is connected to the assembly nut 244b via the attachment member 246. The other end 245b of the guide member 245 is attached to the rear surface of the movable body 250 with adhesive or the like.

[0057] With the vehicle seat S3, the airbags 242, 243 can be inflated and deployed in a more stable manner. In particular, the second airbag 243 can be inflated and deployed on the inner surface side of the side frame 221 in a stable manner.

[0058] <Fourth embodiment of vehicle seat> Next, a vehicle seat S4 according to a fourth embodiment will be described with reference to FIGS. It should be noted that the description of the same contents as those of the vehicle seats S1 to S3 described above will be omitted. As shown in Figures 12 and 13, the vehicle seat S4 comprises a seat body having a seat back 302, a side support member 330, a side airbag device 340 having an airbag module 341, and a retainer member 360 that holds the airbag module 341 from the rear side of the seat.

[0059] The retainer member 360 is a metal or resin holding member that holds the airbags 342, 343 and the inflator 344 from the rear side of the seat, and receives the pressure that accompanies the airbags 342, 343 when they are inflated and deployed. The retainer member 360 has a generally U-shaped cross section and includes a rear wall portion 361 that is positioned on the seat rear side of the airbag module 341, and an inner wall portion 362 and an outer wall portion 363 that extend continuously from both ends of the rear wall portion 361 in the seat width direction toward the front side of the seat. The inner wall portion 362 and the outer wall portion 363 extend in the front-rear direction of the seat along the side surfaces of the airbag module 341 .

[0060] The inner wall portion 362 is fastened together with the side frame 321 by an assembly shaft 344a that protrudes from the inflator 344 inward in the seat width direction. The outer wall portion 363 is provided on a side portion of the skin material 302b, and extends toward the front side of the seat to a position at or near the skin tearing portion 302ba that tears when the first airbag 342 inflates and deploys. More specifically, the tip end (front end) of the outer wall portion 363 is disposed at a position overlapping (the same position as) the skin tearing portion 302ba in the seat front-rear direction and the up-down direction. The tip of the outer wall portion 363 may be attached to the skin tearing portion 302ba with an adhesive or the like. Preferably, the tip of the outer wall portion 363 is attached to the skin tearing portion 302ba of the outer skin material 302bc. The tip of the outer wall portion 363 may be attached to the skin tearing portion 302ba via an attachment member (attachment plate) (not shown).

[0061] Providing the retainer member 360 as described above makes it possible to suitably withstand the pressure caused by the inflation and deployment of the airbags 342, 343. Furthermore, the pressure received by the retainer member 360 can be transmitted to the skin tearing portion 302ba, allowing the skin tearing portion 302ba to tear efficiently. Furthermore, the retainer member 360 can be stably attached.

[0062] <<Modification 1 of the retainer member>> Next, a first modification of the retainer member 360 will be described with reference to FIG. The retainer member 360 of variant 1 has a generally U-shaped cross section and includes a rear wall portion 361 arranged on the seat rear side of the airbag module 341, and an inner wall portion 362 and an outer wall portion 363 extending continuously from both ends of the rear wall portion 361 in the seat width direction toward the front side of the seat. The inner wall portion 362 and the outer wall portion 363 extend in the front-rear direction of the seat along the side surfaces of the airbag module 341 .

[0063] The outer wall portion 363 is provided at the front end portion of the skin material 302b, and extends toward the front side of the seat to a position at or near the skin tearing portion 302ba that tears when the first airbag 342 inflates and deploys. Specifically, the tip (front end) of the outer wall portion 363 extends further forward of the seat than the side support member 330, and is positioned so as to overlap (be at the same position as) the skin tearing portion 302ba in the seat front-rear and up-down directions. The tip of the outer wall portion 363 may be attached directly to the skin tearing portion 302ba, or may be attached to the skin tearing portion 302ba via an attachment member (attachment plate) (not shown).

[0064] Providing the retainer member 360 as described above makes it possible to suitably withstand the pressure caused by the inflation and deployment of the airbags 342, 343. In addition, the pressure received by the retainer member 360 can be transmitted to the skin tearing portion 302ba, thereby allowing the skin tearing portion 302ba to tear efficiently.

[0065] <Fifth embodiment of vehicle seat> Next, a vehicle seat S5 according to a fifth embodiment will be described with reference to FIGS. It should be noted that the description of the same contents as those of the vehicle seats S1 to S4 described above will be omitted. The vehicle seat S5 includes a seat body having a seat back 402, a side support member 430, a side airbag device 440 having an airbag module 441, and a retainer member 460 that holds the airbag module 441 from the rear side of the seat.

[0066] The retainer member 460 is a holding member that holds the airbags 442, 443 and the inflator 444 from the rear side of the seat. The retainer member 460 has a generally L-shaped cross section and includes a rear wall portion 461 that is positioned on the seat rear side of the airbag module 441, and an outer wall portion 463 that extends continuously from one end of the rear wall portion 461 in the seat width direction toward the front side of the seat. The outer wall portions 463 extend along the side surfaces of the airbag module 441 in the front-rear direction of the seat.

[0067] As shown in FIG. 16, the retainer member 460 is attached in a state where it is housed inside the bag-shaped holder member 447. The holder member 447 is formed by, for example, bonding two sheets of skin material together and sewing them into a bag shape. One end 447a of the holder member 447 in the seat width direction is provided on a side portion of the skin material 402b and is connected to a skin tearing portion 402ba that tears when the first airbag 442 is inflated and deployed. In other words, the holder member 447 is attached integrally with the skin material 402b. The one end 447a may extend toward the front side of the seat to a position near the skin tearing portion 402ba and be connected to a predetermined position on the rear surface of the skin material 402b.

[0068] The other end 447b of the holder member 447 in the seat width direction is attached to the rear surface of the rear end of the side frame 421 with adhesive or the like. The other end 447b may be attached to the rear surface of the side frame 421 via an attachment member (attachment plate) not shown.

[0069] By providing the retainer member 460 as described above, the pressure caused by the inflation and deployment of the airbags 442 and 443 can be received in an appropriate manner. Furthermore, by providing the holder member 447, the retainer member 460 can be stably attached.

[0070] <Sixth embodiment of vehicle seat> Next, a vehicle seat S6 according to a sixth embodiment will be described with reference to FIGS. It should be noted that the description of the same contents as those of the vehicle seats S1 to S5 described above will be omitted. The vehicle seat S6 includes a seat body having a seat back 502, a side support member 530, a side airbag device 540 having an airbag module 541, and a retainer member 560 that holds the airbag module 541 from the rear side of the seat.

[0071] As shown in FIG. 17, the airbag module 541 is attached to the upper portion of the seat back 502, and is disposed so as to straddle the side frame 521 and the upper frame 522 in the vertical direction.

[0072] As shown in FIG. 18, the retainer member 560 is a holding member that holds the airbags 542, 543 and the inflator 544 from the rear side of the seat, and is positioned above the side frame 521 and at the same height as the lower end portion of the upper frame 522. The retainer member 560 has a generally U-shaped cross section and includes a rear wall portion 561 arranged on the seat rear side of the airbag module 541, an outer wall portion 563 extending continuously from one end (outer end) of the rear wall portion 561 in the seat width direction toward the front side of the seat, and a frame mounting portion 564 protruding toward the seat front side from the other end (inner end) of the rear wall portion 561 in the seat width direction and mounted to the upper frame 522.

[0073] The frame attachment portion 564 is a hook member having a substantially C-shaped cross section, and can be attached so as to sandwich the pipe-shaped upper frame 522 from behind the seat. The frame attachment portion 564 is not limited to a hook shape as long as it can be attached to the upper frame 522. The frame attachment portion 564 may be attached to the upper frame 522 with an adhesive or the like.

[0074] By providing the retainer member 560 as described above, the pressure caused by the inflation and deployment of the airbags 542 and 543 can be received in an appropriate manner. Furthermore, by providing the frame mounting portion 564, the retainer member 560 can be mounted stably.

[0075] Seventh embodiment of vehicle seat Next, a vehicle seat S7 according to a seventh embodiment will be described with reference to FIGS. It should be noted that the description of the same contents as those of the vehicle seats S1 to S6 described above will be omitted. The vehicle seat S7 includes a seat body having a seat back 602, a side airbag device 640 having an airbag module 641, and a retainer member 670 that holds the airbag module 641 from the rear side of the seat.

[0076] As shown in FIG. 20, the seat back 602 includes a padding material 602a disposed on the front surface of the back frame 620, and a cover material 602b that covers the back frame 620 and the padding material 602a. The pad material 602a is formed in a position forward of the airbag module 541 on the side portion 602B of the seat back 602, and has pad through-holes 602aa and 602ad that penetrate from the outer surface to the inner surface of the pad material 602a. The skin material 602b has a skin tearing portion 602ba on the outer surface of the side portion 602B, which is torn when the airbags 642, 643 are inflated and deployed.

[0077] As shown in FIG. 20, the side airbag device 640 includes an airbag module 641 having a first airbag 642, a second airbag 643, and an inflator 644, and a guide member 645 that guides the inflation and deployment of the airbags 642, 643. The airbag module 641 is attached to the outer surface of the side frame 621. More specifically, an assembly shaft 644a of the inflator 644 passes through the side frame 621 and the retainer member 660 and is fastened with an assembly nut. The side airbag device 640 does not necessarily have to include the second airbag 643.

[0078] The guide member 645 is a webbing that guides the direction in which the airbags 642 and 643 expand and deploy, and may be a strap. One end 645a of the guide member 645 is attached by sewing to the rear surface of the front end of the cover material 602b (specifically, the inner cover material 602bb). The guide member 645 extends from one end 645a toward the rear of the seat so as to cover the pad material 602a (specifically, the pad material 602a of the side portion 602B) from the outside, and further extends so as to pass through the pad through-hole 602aa of the pad material 602a. The other end 645b of the guide member 645 passes between the pad material 602a and the airbag module 641 in the seat front-rear direction, extends toward the inside in the seat width direction, and passes through the pad through-hole 602ad. The other end 645b is attached to the back surface of the inside end in the seat width direction of the side portion 602B of the cover material 602b.

[0079] A plate-shaped attachment member 645c (for example, a resin trim cord) is sewn to the other end 645b of the guide member 645. The other end 645b is hooked so as to be sandwiched between the pad material 602a and the cover material 602b via the attachment member 645c. More specifically, when the other end 645b of the guide member 645 is passed through the pad through-hole 602aa, the attachment member 645c is folded. When the other end 645b is to be hooked, the attachment member 645c is raised (raised to form a T-shape) and hooked into the space between the pad material 602a and the cover material 602b.

[0080] By providing the guide member 645 as described above, the deployment direction of the side portion 602B of the seat back 602 can be appropriately guided when the airbag is deployed, which results in the airbag being deployed quickly. Furthermore, the provision of the mounting member 645c allows the guide member 645 to be easily mounted.

[0081] As shown in FIG. 20, the retainer member 670 is a holding member having a substantially T-shaped cross section that holds the airbag module 641 from the rear side of the seat, and is attached to the side frame 621. The retainer member 670 has a rear wall portion 671 that is arranged on the seat rear side of the airbag module 641 and the side frame 621, a folded wall portion 672 that is formed by folding back the right end portion of the rear wall portion 671 and extends outward in the seat width direction along the rear end portion (rear flange portion 621c) of the side frame 621, and a side wall portion 673 that bends from the extended end portion of the folded wall portion 672 and extends forward of the seat along the inner surface of the side frame 621.

[0082] The retainer member 670 is attached to the side frame 621 from the inside in the seat width direction, and is attached so as to sandwich a part of the side frame 621 (rear flange portion 621c). Further, the retainer member 670 (side wall portion 673) is provided on the inflator 644, and is fastened together with the side frame 621 by an assembly shaft 644a that protrudes from the inflator 644 toward the inside in the seat width direction.

[0083] The retainer member 670 further has a first reinforcing portion 674 attached to the rear surface of the rear wall portion 671 and protruding toward the rear of the seat, and a second reinforcing portion 675 attached to the connecting portion of the folded wall portion 672 and the side wall portion 673 and protruding from the side wall portion 673 toward the inside in the seat width direction. The first reinforcing portion 674 and the second reinforcing portion 675 are reinforcing ribs (partitions) with a generally triangular cross section that are arranged at positions corresponding to the airbag module 641, respectively. More specifically, the first reinforcing portion 674 is disposed at a position overlapping (the same position as) the airbag module 641 in the seat width direction and the up-down direction, and protrudes in a direction away from the airbag module 641. The second reinforcing portion 675 is disposed at a position overlapping (the same position as) the airbag module 641 in the seat front-rear direction and up-down direction, and protrudes in a direction away from the airbag module 641. The first reinforcing portion 674 and the second reinforcing portion 675 are each disposed in the vicinity of the inflator 644 so as to surround the inflator 644 .

[0084] By providing the retainer member 670 as described above, the pressure caused by the inflation and deployment of the airbags 642, 643 can be received in an appropriate manner.

[0085] <<Modification 1 of guide member>> Next, a first modification of the guide member 645 will be described with reference to FIG. The guide member 645 is a webbing that guides the airbags 642 and 643 in the direction in which they expand and deploy. One end 645a of the guide member 645 is attached to the rear surface of the front end of the cover material 602b by sewing. The guide member 645 extends from one end 645a toward the rear of the seat so as to cover the pad material 602a from the outside, and further extends so as to pass through the pad through-hole 602aa of the pad material 602a. The other end 645b of the guide member 645 passes between the pad material 602a and the airbag module 641 in the seat front-rear direction and extends toward the inside in the seat width direction. The other end 645b is attached to the back surface of the inside part in the seat width direction of the side portion 602B of the pad material 602a.

[0086] More specifically, the other end 645b of the guide member 645 is attached to the rear surface of the pad material 602a by an attachment member 645c (specifically, an attachment pin). At this time, a pad high hardness portion 602c having a higher hardness than the pad material 602a is provided on the rear surface of the pad material 602a in a portion facing the other end portion 645b. The pad high hardness portion 602c is integrally formed with the pad material 602a on the rear surface of the pad material 602a.

[0087] By providing the guide member 645 as described above, the deployment direction of the side portion 602B of the seat back 602 can be suitably guided when the airbag is deployed. Furthermore, the provision of the attachment member 645c and the pad high hardness portion 602c allows the guide member 645 to be attached easily.

[0088] <<Modification 2 of Retainer Member>> Next, a second modification of the retainer member 670 will be described with reference to FIG. The retainer member 670 of the second modification is a holding member having a substantially C-shaped cross section that holds the airbag module 641 from the side of the seat, and is attached to the side frame 621. The retainer member 670 has a rear wall portion 671 that is arranged on the rear side of the seat of the side frame 621, a folded wall portion 672 that is formed by folding back the right end portion of the rear wall portion 671 and that sandwiches the rear end portion (rear flange portion 621c) of the side frame 621, a side wall portion 673 that bends from the left end portion of the rear wall portion 671 and extends forward of the seat along the side of the airbag module 641 and the side frame 621, and a front wall portion 676 that bends from the front end portion of the side wall portion 673 and protrudes inward in the seat width direction.

[0089] The retainer member 670 is attached to the side frame 621 from the outer side in the seat width direction, and is attached so as to sandwich a part of the side frame 621 (rear flange portion 621c). The retainer member 670 is disposed between the side frame 621 and the airbag module 641 in the seat width direction. More specifically, the retainer member 670 (side wall portion 673) is provided on the inflator 644, and is fastened together with the side frame 621 by an assembly shaft 644a that protrudes from the inflator 644 toward the inside in the seat width direction.

[0090] The retainer member 670 further has a reinforcing portion 674 attached to the connecting portion of the side wall portion 673 and the front wall portion 676, and protruding inward from the side wall portion 673 in the seat width direction. The reinforcing portion 674 is a reinforcing rib (partition portion) having a substantially triangular cross section and disposed at a position corresponding to the airbag module 641. More specifically, the reinforcing portion 674 is disposed at a position overlapping (the same position as) the airbag module 641 in the seat front-rear direction and the up-down direction, and protrudes in a direction away from the airbag module 641. The reinforcing portion 674 is disposed in a position close to the starting position of the inflation and deployment of the airbags 642 and 643.

[0091] By providing the retainer member 670 as described above, the pressure caused by the inflation and deployment of the airbags 642, 643 can be received in an appropriate manner.

[0092] <Eighth embodiment of vehicle seat> Next, a vehicle seat S8 according to an eighth embodiment will be described with reference to FIG. It should be noted that the description of the same contents as those of the vehicle seats S1 to S7 described above will be omitted. The vehicle seat S8 includes a seat body having a seat back 702, a side support member 730, a side airbag device 740, and a guide member 780 that is arranged between the side support member 730 and the side frame 721 in the front-to-rear direction of the seat and that guides the inflation and deployment direction of the airbags 742, 743.

[0093] The side support members 730 are L-shaped linear members (specifically, wire members) and are attached to the left and right side frames 21 at the front portions of the seat by welding. The side airbag device 740 includes an airbag module 741 having a first airbag 742 , a second airbag 743 and an inflator 744 . It should be noted that the side airbag device 740 may have only the first airbag 742 and not the second airbag 743.

[0094] The guide member 780 is a plate-like member that is long in the vertical direction, and is attached to the side support member 730, and is arranged so as to cover the gap between the side support member 730 and the side frame 721 in the front-rear direction of the seat. More specifically, the guide member 780 is hooked onto the side support member 730 by a plurality of attachment members (for example, attachment clips) not shown. The guide member 780 may be attached to the side frame 721, for example.

[0095] By providing the guide member 780 as described above, the direction in which the side portion of the seat back 702 expands and deploys can be appropriately guided when the airbag expands and deploys, which results in the airbag being able to be deployed quickly. Furthermore, by using the side support members 730, the guide members 780 can be easily attached.

[0096] In the above embodiment, a vehicle seat used in an automobile has been described as a specific example, but the present invention is not limited to this and can also be used for various seats such as two-wheeled seats for two-wheeled vehicles, vehicle seats for trains and buses, and vehicle seats for airplanes, ships, etc.

[0097] In the above embodiment, the vehicle seat according to the present invention has been mainly described. However, the above embodiment is merely an example for facilitating understanding of the present invention, and does not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0098] S1~S8 Vehicle seats 1 seat cushion 1A central part 1B Side part 1a Pad material 1b Skin material 2, 102, 202, 302, 402, 502, 602, 702 seat back 2A central part 2B, 102B, 202B, 602B side section 2a, 102a, 202a, 302a, 602a padding 2aa, 602aa, 602ad Pad through holes 2ab Inner Pad 2ac outer pad 2b, 102b, 302b, 402b, 602b Skin material 2ba, 302ba, 402ba, 602ba Epidermal cleavage 2bb, 302bb, 602bb inner skin material 2bc, 302bc, 602bc Outer skin material 602c Pad high hardness part 3 Headrest 3a padding material 3b Skin material 3c pillar 4 Reclining device 5 Height link device 6 Rail device 10 Cushion Frame 11 Cushion side frame 12 Pan Frame 13 Rear connecting frame 14 Support member (elastic spring) 20, 120, 220, 320, 420, 520, 620, 720 Back Frame 21, 121, 221, 321, 421, 521, 621, 721 Side frame 21a, 621a Frame body 21b, 621b Front flange 21c, 621c rear flange 22, 522 Upper frame 23 Lower frame 24 Wire member (elastic wire) 25 Support Plate 26 Pillar mounting member 27 Protective member (protective plate) 27a Plate body 27b Front part of plate 27c Rear part of plate 28 Second protective member (protective cap) 30, 130, 230, 330, 430, 530, 730 Side support member 31 Wire body 32 Wire extension 40, 140, 240, 340, 440, 540, 640, 740 Side airbag device 41, 141, 241, 341, 441, 541, 641, 741 Airbag Module 42, 142, 242, 342, 442, 542, 642, 742 First airbag 43, 143, 243, 343, 443, 543, 643, 743 Second airbag 44, 144, 244, 344, 444, 544, 644, 744 Inflator 44a, 144a, 244a, 644a assembly shaft 44b, 244b assembly nuts 244c Mounting groove 145, 245, 645 Guide member 145a, 245a, 645a One end 145b, 245b, 645b Other end 645c Mounting material 146, 246 Mounting bracket, mounting member 146a Slit 447 Holder member 447a One end 447b Other end 150, 250 Movable body 151 Mounting part 152 Rotating member 152a Rotating main body 152b Protruding part (protruding rib) 360, 460, 560 retainer member 361, 461, 561 Rear wall 362 Inner wall 363, 463, 563 outer wall 564 Frame mounting part 670, 770 Retainer member 671 Rear wall 672 Folded wall section 673 Side wall 674 First reinforcement part, reinforcement part 675 Second reinforcement 676 Front wall 780 Guide member G Gap

Claims

1. The seat back serves as the backrest, a side airbag device attached to a side portion of the seat back in a seat width direction, for absorbing an impact applied from the side of the vehicle, The seat back is a back frame having side frames disposed on the left and right sides in the seat width direction; a side support member attached to a seat front portion of the side frame, protruding further toward the seat front side than the side frame, for causing a side portion of the seat back to protrude toward the seat front side, The side support members extend longitudinally in the up-down direction along the side frames, and are disposed with a gap formed between them and the side frames in the seat front-rear direction, The side airbag device includes an airbag module attached to one of the outer and inner surfaces of the side frame, The airbag module includes: a first airbag that inflates and deploys on the one side surface of the side frame; a second airbag that inflates and deploys on the other side surface of the side frame; an inflator that supplies gas to the inside of the first airbag and the second airbag, The second airbag passes through the gap formed between the side frame and the side support member in the seat front-rear direction and inflates and deploys on the other side of the side frame.

2. The side support members are linear members attached to the upper portion of the side frame and the lower portion of the side frame, respectively, and extend elongated in the vertical direction, The airbag module is attached to an outer surface of the side frame, the first airbag expands and deploys toward the front of the seat on the outer surface side of the side frame, 2. The vehicle seat according to claim 1, wherein the second airbag passes through the gap formed between the side frame and the linear member and inflates and deploys toward the inside in the seat width direction on the inner surface side of the side frame.

3. the seat back is attached to a side surface of the side frame and includes a protective member covering the side frame, 2. The vehicle seat according to claim 1, wherein the protection member is disposed so as to cover at least a front end portion and a rear end portion of the side frame.

4. The side frame is a frame main body portion extending in the front-rear direction of the seat; a front flange portion that is continuous with the front end portion of the frame main body and protrudes inward in the seat width direction; a rear flange portion that is continuous with the rear end portion of the frame main body and protrudes inward in the seat width direction, The protective member is a flexible protective plate, The protective plate is a plate body portion covering an inner surface of the frame body portion; a plate front portion that is continuous with the front end portion of the plate main body and is folded back to cover the front flange portion; 4. The vehicle seat according to claim 3, further comprising: a plate rear portion that is continuous with the rear end of the plate main body and is folded back to cover the rear flange portion.

5. The back frame has an upper frame that connects upper ends of the left and right side frames, 4. The vehicle seat according to claim 3, wherein the seat back includes a second protective member that covers a portion of the upper frame that is connected to an upper end of the side frame.

6. The seat back is a padding material disposed on the front surface of the back frame; a cover material that covers the back frame and the pad material; a movable body provided on a side portion of the seat back, disposed between the side frame and the pad material in the seat front-rear direction, and movable to cause the pad material to protrude toward the seat front side at the side portion, 2. The vehicle seat according to claim 1, wherein the movable body moves toward the front of the seat as the second airbag inflates and deploys, causing the padding to protrude toward the front of the seat.

7. 7. The vehicle seat according to claim 6, wherein the movable body has a rotating member attached so as to be rotatable relative to the side support member, and which rotates toward the front side of the seat as the second airbag inflates and deploys, causing the pad material to protrude toward the front side of the seat.

8. The rotating member is a pivoting main body portion attached to the side support member so as to be pivotable relative to the side support member and extending from the side support member toward the rear of the seat along a bottom surface of the pad material; 8. The vehicle seat according to claim 7, further comprising a protrusion that protrudes from a front surface of the pivoting main body toward the padding and abuts against the padding.

9. The side airbag device further includes a guide member that guides the inflation and deployment of the second airbag, one end of the guide member is attached to the side frame or to a mounting bracket attached to the side frame, 7. The vehicle seat according to claim 6, wherein the other end of the guide member is attached to the movable body.

10. The side airbag device further includes a guide member that guides the inflation and deployment of the second airbag, One end of the guide member is attached to a mounting bracket attached to a side surface of the side frame, and the other end of the guide member is attached to the second airbag, 2. The vehicle seat according to claim 1, wherein the mounting bracket is provided on the inflator and fastened to the side frame by an assembly shaft that protrudes from the inflator in the seat width direction.

11. The vehicle seat according to claim 10, wherein the mounting bracket is positioned more inward in the seat width direction than the side frame and has a slit through which one end of the guide member is inserted for mounting.

12. The seat back includes a padding material disposed on a front surface of the back frame, and a cover material covering the back frame and the padding material, The side airbag device has a retainer member that holds the airbag module from the rear side of the seat, The retainer member is a rear wall portion disposed on the seat rear side of the airbag module; a side wall portion that is continuous with one end of the rear wall portion in the seat width direction and extends toward the seat front side along a side surface of the airbag module, 2. The vehicle seat according to claim 1, wherein the side wall portion is provided on the skin material and extends toward the front side of the seat to a position reaching a skin tearing portion or a vicinity of the skin tearing portion that tears when the first airbag is deployed.

13. The side airbag device has a retainer member that holds the airbag module from the rear side of the seat, The retainer member is a rear wall portion disposed on the seat rear side of the airbag module; a side wall portion disposed along the other side surface of the side frame; a reinforcing portion attached to a rear surface of the rear wall portion and protruding rearward of the seat, 2. The vehicle seat according to claim 1, wherein the side wall portion is provided on the inflator and fastened to the side frame by an assembly shaft that protrudes from the inflator in the seat width direction.

14. The side airbag device has a retainer member that holds the airbag module from a side of a seat, The retainer member is a side wall portion disposed along a side surface of the side frame; a front wall portion that protrudes continuously from a front end of the side wall portion in a seat width direction and is disposed on a seat rear side of the second airbag when the second airbag is inflated and deployed; a reinforcing portion attached to a rear surface of the front wall portion and protruding toward the rear of the seat, 2. The vehicle seat according to claim 1, wherein the side wall portion is provided on the inflator and fastened to the side frame by an assembly shaft that protrudes from the inflator in the seat width direction.

15. The seat back includes a padding material disposed on a front surface of the back frame, and a cover material covering the back frame and the padding material, the pad material is formed in a side portion of the seat back at a position forward of the airbag module, and has a pad through-hole that penetrates from an outer surface to an inner surface of the pad material, the skin material has a skin tearing portion on an outer surface of the side portion that tears when the first airbag is inflated and deployed, the side airbag device includes a guide member that guides the inflation and deployment of the first airbag, The guide member is one end of the guide member is attached to a front portion or an outer portion of the skin material at the side portion, a pad through-hole formed in the outer surface of the pad material at the side portion; 2. The vehicle seat according to claim 1, wherein the other end of the guide member passes through the pad through-hole formed on the inner surface of the pad material in the side portion and is attached to the inner portion of the cover material in the side portion.

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