Vehicle seats

Abstract

(Task) Provide a vehicle seat that can comfortably support the shoulders of a seated person. (Solution) In a vehicle seat (1) provided with a seat cushion (3) and a seat back (4), the seat back includes: left and right side members (22) extending upward and downward; a lower cross member (24) extending laterally and connected to the left and right side members, a cross member (25) extending laterally above the lower cross member and connected to the left and right side members; at least one wire member (31) extending upward and downward and connected to the lower cross member and the cross member; and at least one shoulder support member (32) supported on the upper part of the wire member. The shoulder support member includes: a first plate member (32A) facing the front-rear direction and connected to the upper part of the wire member; and a second plate member (32C) facing the front-rear direction and connected to the first plate member via a flexible member (32B).

Description

Technical Field

[0001] The present invention relates to a vehicle seat. Background Art

[0002] Patent Document 1 discloses a seat back comprising a lumbar support member and left and right shoulder support members. The left and right shoulder support members are integrally formed at the upper end of the lumbar support member. Patent Document 2 discloses a seat back comprising a single, laterally extending shoulder support member. In Patent Document 2, the shoulder support member is independent of the lumbar support member and is connected to a blower.

[0003] Prior art literature

[0004] Patent Literature

[0005] [Patent Document 1] JP2015-209082A

[0006] [Patent Document 2] JP2015-209062A Summary of the Invention

[0007] The task to be accomplished by the present invention

[0008] The shoulder support member can comfortably support the seated occupant by moving and deforming along the occupant's shoulders. However, because the shoulder support member of Patent Document 1 is connected to the lumbar support member, it is difficult to move and deform. Similarly, the shoulder support member of Patent Document 2 is connected to the blower, making it difficult to move and deform. Consequently, the shoulder support members of Patent Documents 1 and 2 do not comfortably support the seated occupant's shoulders.

[0009] In view of the above background, an object of the present invention is to provide a vehicle seat that can comfortably support the shoulders of a seated person.

[0010] Means of completing the task

[0011] In order to achieve the above-mentioned object, a vehicle seat (1) is provided, which is provided with a seat cushion (3) and a seat back (4), wherein the seat back comprises: left and right side members (22) extending upward and downward; a lower cross member (24) extending laterally and connected to the left and right side members; a cross member (25) extending laterally above the lower cross member and connected to the left and right side members; at least one wire member (31) extending upward and downward and connected to the lower cross member and the cross member; and at least one shoulder support member (32) supported on an upper portion of the wire member, and the shoulder support member comprises: a first plate member (32A) facing in the front-rear direction and connected to the upper portion of the wire member; and a second plate member (32C) facing in the front-rear direction and connected to the first plate member via a flexible member (32B).

[0012] According to this aspect, the second plate member can be displaced relative to the first plate member by utilizing deformation of the flexible member. Therefore, when the shoulder support member is pushed by the seated occupant's shoulders, the first and second plate members can move along the shoulders. This provides a vehicle seat that comfortably supports the occupant's shoulders.

[0013] In the above aspect, preferably, a plate-like waist support member (44) facing the front-rear direction is supported on a lower portion of the wire member.

[0014] According to this aspect, it is possible to support the shoulder support member by using the wire member that supports the waist support member.

[0015] In the above aspect, preferably, the wire member includes a first portion (31A) and a second portion (31B) inclined relative to each other via a bent portion, and the first plate part of the shoulder supporting member includes a first locking portion (34) that locks the first portion and a second locking portion (35) that locks the second portion.

[0016] According to this aspect, since the first locking portion and the second locking portion lock the first portion and the second portion that are inclined relative to each other, the position of the shoulder member relative to the wire member can be fixed.

[0017] In the above aspect, preferably, the first plate part of the shoulder support member includes a seating part (36) located between the first locking portion and the second locking portion, the seating part contacting the first portion and the second portion.

[0018] According to this aspect, due to the setting member contacting the first portion and the second portion, the position of the shoulder member relative to the wire member can be fixed more reliably.

[0019] In the above aspect, preferably, when viewed from the front, the first plate member and the flexible member are provided between the left and right side members, and at least a portion of the second plate member is provided in front of the side members.

[0020] According to this aspect, the first plate member can be displaced rearwardly relative to the second plate member along the back of the seated person.

[0021] In the above aspect, preferably, the flexible part extends upward and downward along a transverse inner edge of the side member when viewed from the front.

[0022] According to this aspect, the first plate component can be displaced rearward without interfering with the side members.

[0023] In the above aspect, preferably, the flexible member has a slit (39) that penetrates the flexible member in the front-rear direction and extends upward and downward with an open lower end.

[0024] According to this aspect, the first plate member can be easily displaced relative to the second plate member.

[0025] In the above aspect, preferably, a fluid bag assembly (52) that expands when liquid is supplied is provided on the front surface of the shoulder support member.

[0026] According to this aspect, the fluid bag can change the shape of the pad provided in front of the shoulder support member. Thus, the vehicle seat can comfortably support the shoulders of the seated person.

[0027] In the above aspect, preferably, the shoulder support member includes a support surface (32F) extending in a first direction and facing forward, a fluid supply device (53) is connected to the fluid bag assembly,

[0028] One side in the first direction is referred to as the first side and the other side in the first direction is referred to as the second side, and the fluid bag assembly includes: a first fluid bag (56) arranged on the supporting surface; a second fluid bag (57), which includes a first connecting part (61) connected to the first fluid bag in an end portion of the first side and is in communication with the first fluid bag; and a third fluid bag (58), which includes a second connecting part (62) connected to the second fluid bag in an end portion of the first side and is in communication with the second fluid bag, and in a collapsed state of the fluid bag assembly, when viewed in a direction perpendicular to the supporting surface, the first side edge (61A) and the second side edge (62A) each extend linearly and in mutually different directions, wherein the first side edge is the side edge of the first connecting part on the second side, and the second side edge is the side edge of the second connecting part on the second side.

[0029] According to this aspect, since the first side edge and the second side edge extend in different directions, it is possible to change the expansion direction of the second fluid bag and the expansion direction of the third fluid bag. Therefore, the shape of the fluid bag assembly when expanded can be diversified.

[0030] In the above aspect, preferably, the second side edge is provided farther on the second side than the first side edge.

[0031] According to this aspect, the shape of the fluid bag assembly when inflated can be diversified.

[0032] In the above aspect, preferably, the length of the second fluid bag in the first direction is longer than the length of the third fluid bag in the first direction.

[0033] According to this aspect, the shape of the fluid bag assembly when inflated can be diversified.

[0034] In the above aspect, preferably, the fluid supply device is connected to the first fluid bag, the first fluid bag and the second fluid bag are connected by a first communicating hole (61B) passing through the first connecting part, and the second fluid bag and the third fluid bag are connected by a second communicating hole (62B) passing through the second connecting part.

[0035] According to this aspect, the structure for connecting the air supply device and the fluid bag assembly can be made simple.

[0036] In the above aspect, preferably, the first fluid bag, the second fluid bag, and the third fluid bag extend in the first direction.

[0037] According to this aspect, the shape of the fluid bag assembly when collapsed can be manufactured simply.

[0038] In the above aspect, preferably, the first fluid bag includes a tongue (56D) protruding to one side, and the tongue is fastened to a side surface perpendicular to the support surface of the shoulder support member.

[0039] According to this aspect, the shoulder support portion can be made compact in size, and the fluid bag assembly can be made compact in size.

[0040] In the above aspect, preferably, the shoulder support member includes a pair of left and right shoulder support members, and the fluid bag assembly includes a pair of left and right fluid bag assemblies, the left and right shoulder support members are arranged on the left and right parts of the upper part of the seat back so that the first side points laterally inward and downward, and in the contracted state of the fluid bag assembly, when viewed from the front, each of the first side edge and the second side edge extends obliquely downward in a laterally outward direction.

[0041] According to this aspect, the fluid bag assembly can cause the portion of the seat back corresponding to the seat occupant's shoulders to swell laterally inward and downward, thereby providing a seat back that conforms to the position and shape of the seat occupant's shoulders.

[0042] In the above aspect, preferably, the second plate component and the side member are in contact with each other in the front-rear direction.

[0043] According to this aspect, the position of the second plate member in the seat back can be fixed.

[0044] In the above aspect, preferably, the second plate part extends along the side member when viewed from the front.

[0045] According to this aspect, since the second plate member exists between the shoulders of the seated person and the side members, the shoulders of the seated person can be comfortably supported.

[0046] In the above aspect, preferably, the second plate member includes an abutment portion (37) protruding rearward in a rear portion thereof, and the second plate member contacts the side member at the abutment portion.

[0047] According to this aspect, the second plate component and the side member can reliably contact each other.

[0048] In the above aspect, preferably, the second plate component and the side member are in contact with each other in the front-rear direction via a cushioning material (38).

[0049] According to this aspect, the buffer material prevents friction and rattling between the second plate component and the side member, thereby preventing generation of noise.

[0050] In the above aspect, preferably, the rear surface of the second plate member is provided with a reinforcement structure (41).

[0051] According to this aspect, it is possible to improve the rigidity of the second plate part that contacts the side member.

[0052] In the above aspect, preferably, the wire member includes a pair of left and right wire members, and the shoulder support member includes a pair of left and right shoulder support members corresponding to the left and right wire members.

[0053] According to this aspect, the left and right shoulder support members can be displaced independently of each other in a manner along the shoulders of the seated person. Thus, a vehicle seat that can comfortably support the shoulders of the seated person can be provided.

[0054] In the above aspect, preferably, a transversely inner edge of the first plate member is inclined transversely outward toward an upward direction.

[0055] According to this aspect, a space can be formed between the upper portions of the left and right shoulder support members, and a device such as a blower can be provided in the space.

[0056] In the above aspect, preferably, an air blower (46) is provided in a central portion of an upper portion of the seat back, and the left and right shoulder support members are provided on the left and right sides of the air blower.

[0057] According to this aspect, the fluid bag assembly and the blower can be disposed within the seat back in a manner that does not interfere with each other.

[0058] In the above aspect, preferably, the blower includes: a blower body (36) provided with an impeller; and a duct (46B) extending from the blower body, wherein the blower body is arranged in the central portion of the upper portion of the seat back, the duct extends upward and downward on one side of the blower body, and one of the left and right shoulder support members is arranged on the left or right side of the duct.

[0059] According to this aspect, the fluid bag assembly and the blower can be disposed within the seat back in a manner that does not interfere with each other.

[0060] In the above manner, preferably, one of the left and right side portions of the seat back is provided with a first side airbag (48), the other of the left and right side portions of the seat back is provided with a second side airbag (49), each of the first side airbag and the second side airbag extends upward and downward, the upper end of the first side airbag is arranged to be higher than the upper end of the second side airbag, and the lower end of each of the left and right shoulder support members is arranged to be higher than the upper end of the second side airbag.

[0061] According to this aspect, the fluid bag assembly and the side airbag can be disposed within the seat back in a manner not to interfere with each other.

[0062] In the above aspect, preferably, each of the left and right fluid bag assemblies has a recessed portion recessed laterally outward on a laterally inner edge thereof, and the left and right side portions of the blower are disposed in the corresponding recessed portions.

[0063] According to this aspect, the fluid bag assemblies and the air blowers can be arranged at a high density.

[0064] Effects of the Invention

[0065] In order to achieve the above-mentioned object, a vehicle seat (1) is provided, which is provided with a seat cushion (3) and a seat back (4), wherein the seat back comprises: left and right side members (22) extending upward and downward; a lower cross member (24) extending laterally and connected to the left and right side members; a cross member (25) extending laterally above the lower cross member and connected to the left and right side members; at least one wire member (31) extending upward and downward and connected to the lower cross member and the cross member; and at least one shoulder support member (32) supported on an upper portion of the wire member, and the shoulder support member comprises: a first plate member (32A) facing in the front-rear direction and connected to the upper portion of the wire member; and a second plate member (32C) facing in the front-rear direction and connected to the first plate member via a flexible member (32B).

[0066] According to this aspect, the second plate member can be displaced relative to the first plate member by utilizing deformation of the flexible member. Therefore, when the shoulder support member is pushed by the seated occupant's shoulders, the first and second plate members can move along the shoulders. This provides a vehicle seat that comfortably supports the occupant's shoulders.

[0067] In the above aspect, preferably, a plate-like waist support member (44) facing the front-rear direction is supported on a lower portion of the wire member.

[0068] According to this aspect, it is possible to support the shoulder support member by using the wire member that supports the waist support member.

[0069] In the above aspect, preferably, the wire member includes a first portion (31A) and a second portion (31B) inclined relative to each other via a bent portion, and the first plate part of the shoulder supporting member includes a first locking portion (34) that locks the first portion and a second locking portion (35) that locks the second portion.

[0070] According to this aspect, since the first locking portion and the second locking portion lock the first portion and the second portion that are inclined relative to each other, the position of the shoulder member relative to the wire member can be fixed.

[0071] In the above aspect, preferably, the first plate part of the shoulder support member includes a seating part (36) located between the first locking portion and the second locking portion, the seating part contacting the first portion and the second portion.

[0072] According to this aspect, due to the setting member contacting the first portion and the second portion, the position of the shoulder member relative to the wire member can be fixed more reliably.

[0073] In the above aspect, preferably, when viewed from the front, the first plate member and the flexible member are provided between the left and right side members, and at least a portion of the second plate member is provided in front of the side members.

[0074] According to this aspect, the first plate member can be displaced rearwardly relative to the second plate member along the back of the seated person.

[0075] In the above aspect, preferably, the flexible part extends upward and downward along a transverse inner edge of the side member when viewed from the front.

[0076] According to this aspect, the first plate component can be displaced rearward without interfering with the side members.

[0077] In the above aspect, preferably, the flexible member has a slit (39) that penetrates the flexible member in the front-rear direction and extends upward and downward with an open lower end.

[0078] According to this aspect, the first plate member can be easily displaced relative to the second plate member.

[0079] In the above aspect, preferably, a fluid bag assembly (52) that expands when liquid is supplied is provided on the front surface of the shoulder support member.

[0080] According to this aspect, the fluid bag can change the shape of the pad provided in front of the shoulder support member. Thus, the vehicle seat can comfortably support the shoulders of the seated person.

[0081] In the above aspect, preferably, the shoulder support member includes a support surface (32F) extending in a first direction and facing forward, a fluid supply device (53) is connected to the fluid bag assembly,

[0082] One side in the first direction is referred to as the first side and the other side in the first direction is referred to as the second side, and the fluid bag assembly includes: a first fluid bag (56) arranged on the supporting surface; a second fluid bag (57), which includes a first connecting part (61) connected to the first fluid bag in an end portion of the first side and is in communication with the first fluid bag; and a third fluid bag (58), which includes a second connecting part (62) connected to the second fluid bag in an end portion of the first side and is in communication with the second fluid bag, and in a collapsed state of the fluid bag assembly, when viewed in a direction perpendicular to the supporting surface, the first side edge (61A) and the second side edge (62A) each extend linearly and in mutually different directions, wherein the first side edge is the side edge of the first connecting part on the second side, and the second side edge is the side edge of the second connecting part on the second side.

[0083] According to this aspect, since the first side edge and the second side edge extend in different directions, it is possible to change the expansion direction of the second fluid bag and the expansion direction of the third fluid bag. Therefore, the shape of the fluid bag assembly when expanded can be diversified.

[0084] In the above aspect, preferably, the second side edge is provided farther on the second side than the first side edge.

[0085] According to this aspect, the shape of the fluid bag assembly when inflated can be diversified.

[0086] In the above aspect, preferably, the length of the second fluid bag in the first direction is longer than the length of the third fluid bag in the first direction.

[0087] According to this aspect, the shape of the fluid bag assembly when inflated can be diversified.

[0088] In the above aspect, preferably, the fluid supply device is connected to the first fluid bag, the first fluid bag and the second fluid bag are connected by a first communicating hole (61B) passing through the first connecting part, and the second fluid bag and the third fluid bag are connected by a second communicating hole (62B) passing through the second connecting part.

[0089] According to this aspect, the structure for connecting the air supply device and the fluid bag assembly can be made simple.

[0090] In the above aspect, preferably, the first fluid bag, the second fluid bag, and the third fluid bag extend in the first direction.

[0091] According to this aspect, the shape of the fluid bag assembly when collapsed can be manufactured simply.

[0092] In the above aspect, preferably, the first fluid bag includes a tongue (56D) protruding to one side, and the tongue is fastened to a side surface perpendicular to the support surface of the shoulder support member.

[0093] According to this aspect, the shoulder support portion can be made compact in size, and the fluid bag assembly can be made compact in size.

[0094] In the above aspect, preferably, the shoulder support member includes a pair of left and right shoulder support members, and the fluid bag assembly includes a pair of left and right fluid bag assemblies, the left and right shoulder support members are arranged on the left and right parts of the upper part of the seat back so that the first side points laterally inward and downward, and in the contracted state of the fluid bag assembly, when viewed from the front, each of the first side edge and the second side edge extends obliquely downward in a laterally outward direction.

[0095] According to this aspect, the fluid bag assembly can cause the portion of the seat back corresponding to the seat occupant's shoulders to swell laterally inward and downward, thereby providing a seat back that conforms to the position and shape of the seat occupant's shoulders.

[0096] In the above aspect, preferably, the second plate component and the side member are in contact with each other in the front-rear direction.

[0097] According to this aspect, the position of the second plate member in the seat back can be fixed.

[0098] In the above aspect, preferably, the second plate part extends along the side member when viewed from the front.

[0099] According to this aspect, since the second plate member exists between the shoulders of the seated person and the side members, the shoulders of the seated person can be comfortably supported.

[0100] In the above aspect, preferably, the second plate member includes an abutment portion (37) protruding rearward in a rear portion thereof, and the second plate member contacts the side member at the abutment portion.

[0101] According to this aspect, the second plate component and the side member can reliably contact each other.

[0102] In the above aspect, preferably, the second plate component and the side member are in contact with each other in the front-rear direction via a cushioning material (38).

[0103] According to this aspect, the buffer material prevents friction and rattling between the second plate component and the side member, thereby preventing generation of noise.

[0104] In the above aspect, preferably, the rear surface of the second plate member is provided with a reinforcement structure (41).

[0105] According to this aspect, it is possible to improve the rigidity of the second plate part that contacts the side member.

[0106] In the above aspect, preferably, the wire member includes a pair of left and right wire members, and the shoulder support member includes a pair of left and right shoulder support members corresponding to the left and right wire members.

[0107] According to this aspect, the left and right shoulder support members can be displaced independently of each other in a manner along the shoulders of the seated person. Thus, a vehicle seat that can comfortably support the shoulders of the seated person can be provided.

[0108] In the above aspect, preferably, a transversely inner edge of the first plate member is inclined transversely outward toward an upward direction.

[0109] According to this aspect, a space can be formed between the upper portions of the left and right shoulder support members, and a device such as a blower can be provided in the space.

[0110] In the above aspect, preferably, an air blower (46) is provided in a central portion of an upper portion of the seat back, and the left and right shoulder support members are provided on the left and right sides of the air blower.

[0111] According to this aspect, the fluid bag assembly and the blower can be disposed within the seat back in a manner that does not interfere with each other.

[0112] In the above aspect, preferably, the blower includes: a blower body (36) provided with an impeller; and a duct (46B) extending from the blower body, wherein the blower body is arranged in the central portion of the upper portion of the seat back, the duct extends upward and downward on one side of the blower body, and one of the left and right shoulder support members is arranged on the left or right side of the duct.

[0113] According to this aspect, the fluid bag assembly and the blower can be disposed within the seat back in a manner that does not interfere with each other.

[0114] In the above manner, preferably, one of the left and right side portions of the seat back is provided with a first side airbag (48), the other of the left and right side portions of the seat back is provided with a second side airbag (49), each of the first side airbag and the second side airbag extends upward and downward, the upper end of the first side airbag is arranged to be higher than the upper end of the second side airbag, and the lower end of each of the left and right shoulder support members is arranged to be higher than the upper end of the second side airbag.

[0115] According to this aspect, the fluid bag assembly and the side airbag can be disposed within the seat back in a manner not to interfere with each other.

[0116] In the above aspect, preferably, each of the left and right fluid bag assemblies has a recessed portion recessed laterally outward on a laterally inner edge thereof, and the left and right side portions of the blower are disposed in the corresponding recessed portions.

[0117] According to this aspect, the fluid bag assemblies and the air blowers can be arranged at a high density. BRIEF DESCRIPTION OF THE DRAWINGS

[0118] Figure 1 is a perspective view of a seat according to one embodiment;

[0119] Figure 2 is a perspective view of a frame of a seat according to this embodiment;

[0120] Figure 3 is a front view of the seat back frame;

[0121] Figure 4 is a front view of the seat back frame with the fluid bag omitted;

[0122] Figure 5 is a perspective view showing a fluid bag assembly and a shoulder support member;

[0123] Figure 6 is a perspective view showing the rear surface of the shoulder support member;

[0124] Figure 7 is a rear view of the upper portion of the seat back frame;

[0125] Figure 8 is an exploded perspective view of the fluid bag assembly;

[0126] Figure 9 1 is an explanatory diagram showing a fluid bag assembly in a deflated state (A), a fluid bag assembly in a partially inflated state (B), and a fluid bag assembly in an inflated state (C);

[0127] Figure 10 is a cross-sectional view of the fluid bag assembly in an expanded state;

[0128] Figure 11 is a perspective view showing a rear surface of a shoulder support member according to an improvement;

[0129] Figure 12 is a cross-sectional view of the fluid bag assembly in an expanded state;

[0130] Figure 13 is a cross-sectional view of the fluid bag assembly in an expanded state; and

[0131] Figure 14 is a front view of a seat back frame according to a partially improved embodiment. Specific embodiments

[0132] Hereinafter, an embodiment in which a vehicle seat according to the present invention is applied to an automobile seat will be described with reference to the accompanying drawings. In the following description, the up-down direction refers to a direction along the vertical direction. Furthermore, the fore-and-aft direction refers to a direction perpendicular to the vertical direction. The direction in which the seat backrest is positioned relative to the seat cushion is the rearward direction, and the direction opposite to the rearward direction is the forward direction. Furthermore, the lateral direction refers to a direction perpendicular to the up-down direction and the fore-and-aft direction and is defined relative to the forward direction.

[0133] like Figure 1 As shown, the seat 1 includes a seat cushion 3 provided on a floor 2 of a vehicle and a seat back 4 extending upward from the rear of the seat cushion 3. The seat cushion 3 supports the buttocks of the occupant, while the seat back 4 supports the back of the occupant. Figure 2 As shown, the seat cushion 3 can be placed on the base plate 2 via slide rails 5. The slide rails 5 include left and right lower rails 5A connected to the base plate 2 and left and right upper rails 5B supported by the left and right lower rails 5A so as to be slidably movable. The seat cushion 3 is connected to the left and right upper rails 5B. A lifting device can be placed between the seat cushion 3 and the upper rails 5B.

[0134] The seat cushion 3 includes a seat cushion frame 11 forming a framework, a cushion 12 supported on the seat cushion frame 11, and a skin member 13 covering the surface of the cushion 12. The seat back 4 includes a seat back frame 15 forming a framework, a cushion 16 supported on the seat back frame 15, and a skin member 17 covering the surface of the cushion 16. The seat cushion frame 11 and the seat back frame 15 are coupled to each other via a reclining device 19 and constitute a frame 20 of the seat 1. In the following description, the seat back 4 is arranged in an initial position in which the seat back 4 extends upward and downward.

[0135] like Figure 2 and 3As shown, the seat back frame 15 includes left and right rear side members 22 extending upward and downward, an upper cross member 23 extending transversely and connected to an upper end of each of the left and right rear side members 22, a lower cross member 24 extending transversely and connected to a lower portion of each of the left and right rear side members 22, and an intermediate cross member 25 extending transversely between the upper cross member 23 and the lower cross member 24 and connected to each of the left and right rear side members 22.

[0136] The lower portions of the left and right rear side members 22 are formed from sheet metal members with surfaces facing left and right. The upper portions of the left and right rear side members 22 and the upper cross member 23 are formed from a continuous tubular member. The tubular member includes a laterally extending central portion and left and right end portions that curve downward relative to the central portion. The left and right end portions of the tubular member are connected to the laterally inward-facing surfaces of the left and right sheet metal members.

[0137] The upper cross member 23 is provided with a pair of left and right headrest support members 27. Each headrest support member 27 is formed into a tubular shape and extends upward and downward. Each headrest support member 27 is connected to the front surface of the upper cross member 23 by welding or the like. The headrest support members 27 are arranged in the transverse central portion of the upper cross member 23 to be spaced laterally. A resin collar (not shown in the drawings) is mounted on each headrest support member 27. A pair of left and right support posts 29A (see FIG. 2 ) extending from the headrest 29 are provided. Figure 1 ) is inserted into and supported by the headrest support member 27 via the shaft collar.

[0138] like Figure 2 and 3 As shown, the seat back frame 15 includes at least one wire member 31 that extends upward and downward and is connected to the lower cross member 24 and the middle cross member 25. In this embodiment, a pair of left and right wire members 31 are provided. Each wire member 31 is made of a metal rod and has flexibility. Each of the left and right wire members 31 includes a first portion and a second portion that are inclined relative to each other via a bend. In this embodiment, each of the left and right wire members 31 includes an upper end 31A that is connected to one of the left and right ends of the middle cross member 25 and extends downward, an upper middle portion 31B that extends laterally inward and downward from the lower end of the upper end 31A at an angle, a lower middle portion 31C that extends downward from the lower end of the upper middle portion 31B, and a lower end 31D that extends laterally outward and downward from the lower end of the lower middle portion 31C and is connected to the lower cross member 24. The upper end 31A and the upper middle portion 31B are inclined relative to each other via a bend. Therefore, the upper end 31A corresponds to the first portion, and the upper middle portion 31B corresponds to the second portion. The left and right lower end portions 31D may be connected to each other by a connecting portion 31E.

[0139] like Figure 4As shown, at least one shoulder supporting member 32 is provided on the upper portion of the wire member 31. In this embodiment, a pair of left and right shoulder supporting members 32 are provided on the wire members 31 corresponding to each other in the transverse direction.

[0140] The left and right shoulder support members 32 are preferably made of, for example, metal or resin. In this embodiment, the shoulder support members 32 are made of resin. The left and right shoulder support members 32 are formed into a bilaterally symmetrical shape. Hereinafter, the right shoulder support member 32 will be described.

[0141] like Figures 4 to 6 As shown, the shoulder support member 32 includes a first plate member 32A facing forward and backward and connected to the upper portion of the wire member 31, and a second plate member 32C facing forward and backward and connected to the first plate member 32A via a flexible member 32B. In the right shoulder support member 32, the first plate member 32A extends obliquely rightward and upward, the second plate member 32C is arranged to the right and extends upward and downward, and the flexible member 32B extends upward and downward between the first and second plate members 32A and 32C. The laterally inner edge 32D of the first plate member 32A is inclined laterally outward in an upward direction. The inner edge 32D of the first plate member 32A is provided with a plate-shaped fastening member 32E protruding rearward. The fastening member 32E extends along the inner edge 32D.

[0142] The flexible member 32B has higher flexibility than the first plate member 32A and the second plate member 32C. By elastic deformation of the flexible member 32B, the first plate member 32A can be displaced relative to the second plate member 32C.

[0143] like Figure 6 As shown, the first plate member 32A includes a first locking portion 34 that locks the upper end portion 31A (a first portion) and a second locking portion 35 that locks the upper middle portion 31B (a second portion). Furthermore, the first plate member 32A includes a positioning member 36 between the first locking portion 34 and the second locking portion 35, such that the positioning member 36 contacts the upper end portion 31A and the upper middle portion 31B. The first locking portion 34 includes a pair of first elastic claws 34A that protrude rearward from the rear surface of the first plate member 32A and a first contact member 34B that protrudes rearward from the rear surface of the first plate member 32A. The pair of first elastic claws 34A face each other and sandwich the upper end portion 31A therebetween. The first contact member 34B contacts the upper end portion 31A sandwiched between the pair of first elastic claws 34A from the front, thereby positioning the first plate member 32A relative to the upper end portion 31A. The pair of first elastic claws 34A extend in the vertical direction.

[0144] The second locking portion 35 includes a pair of second elastic claws 35A that project rearward from the rear surface of the first plate member 32A, and a second contact member 35B that projects rearward from the rear surface of the first plate member 32A. The pair of second elastic claws 35A face each other and sandwich the upper middle portion 31B therebetween. The second contact member 35B contacts the upper middle portion 31B sandwiched between the pair of second elastic claws 35A from the front, thereby determining the position of the first plate member 32A relative to the upper middle portion 31B. The pair of second elastic claws 35A extend laterally inward and downward along the upper middle portion 31B.

[0145] The placement member 36 includes a tubular base 36A that projects rearward from the rear surface of the first plate member 32A, and a wall 36B that projects further rearward from a portion of the rear end edge of the base 36A. When viewed from the rear, the wall 36B extends upward and downward and curves to project laterally inward. The rear end edge of the base 36A contacts the upper end portion 31A and the upper middle portion 31B from the front, the upper end edge of the wall 36B contacts the upper end portion 31A from the left, and the lower end edge of the wall 36B contacts the upper middle portion 31B from above and to the left, thereby securing the position of the shoulder support member 32 relative to the wire member 31.

[0146] like Figure 4 As shown, when viewed from the front, the first plate member 32A and the flexible member 32B are disposed between the left and right rear side members 22, and at least a portion of the second plate member 32C is disposed in front of the right rear side member 22. Preferably, when viewed from the front, the second plate member 32C extends along the right rear side member 22. The second plate member 32C and the right rear side member 22 contact each other in the front-to-rear direction. The second plate member 32C includes a docking portion 37 that protrudes rearward in its rear portion, and the second plate member 32C contacts the right rear side member 22 at the docking portion 37. Preferably, the docking portion 37 is formed into a tubular shape that extends rearward and contacts the front surface of the right rear side member 22 at its rear end edge.

[0147] Preferably, the flexible member 32B extends upward and downward along the transversely inner edge of the right rear member 22 when viewed from the front. In this embodiment, the flexible member 32B has a slit 39 extending upward and downward therethrough in the front-to-rear direction, with an open lower end. Due to the slit 39, the first plate member 32A and the second plate member 32C are connected to each other at their upper ends via the flexible member 32B. This allows the first plate member 32A to be displaced forward and backward relative to the lower portion of the second plate member 32C.

[0148] Edge walls 42 that protrude rearward may be provided on edge portions of the first plate member 32A and the second plate member 32C. The edge walls 42 improve the rigidity of the first plate member 32A and the second plate member 32C.

[0149] A plate-like lumbar support member 44 is supported on the lower portion of the wire member 31, facing in the front-rear direction. Specifically, the left and right shoulder support members 32 are provided on the lumbar support member 44. The lumbar support member 44 is provided in the lower portion of the seat back 4 and supports the occupant's buttocks. Preferably, the lumbar support member 44 is made of resin.

[0150] A blower 46 is located in the center of the upper portion of the seat back 4. This blower 46 includes a blower body 46A equipped with an impeller and a duct 46B extending from the blower body 46A. The blower 46 is mounted to a bracket 46C connected to at least one of the upper cross-member 23 and the middle cross-member 25. In this embodiment, the bracket 46C extends upward and downward, with an upper end connected to the transverse center of the upper cross-member 23 and a lower end connected to the transverse center of the middle cross-member 25. The blower body 46A may be, for example, a centrifugal fan. The blower body 46A is formed into a flat cylindrical shape and is fixed to the front surface of the bracket 46C such that its axis extends in the front-to-back direction. The blower body 46A is located in the center of the upper portion of the seat back 4. More specifically, the blower body 46A is located between the upper cross-member 23 and the middle cross-member 25. Moreover, the blower main body 46A is preferably provided between the left and right headrest support members 27 with respect to the lateral direction.

[0151] Duct 46B has one end connected to the center of the rear surface of blower body 46A and the other end forming an intake port 46D. Duct 46B comprises a transverse member 46E extending rightward from one end behind bracket 46C and the right headrest support member 27, and a vertical member 46F extending downward and forward from the right end of transverse member 46E. In other words, duct 46B extends upward and downward on one side of blower body 46A. Intake port 46D is located at the lower end of vertical member 46F. Vertical member 46F extends upward and downward at a position on the right side of blower body 46A, with intake port 46D positioned lower than the lower end of blower body 46A. In another embodiment, transverse member 46E can extend leftward from one end, such that vertical member 46F is positioned to the left of blower body 46A. In this embodiment, blower body 46A draws air in from the center via duct 46B and exhausts air from the periphery. A duct (not shown) through which the exhausted air flows is connected to the outer periphery of the blower body 46A. In another embodiment, the duct 46B may be omitted and the blower body 46A may directly draw in air.

[0152] A first side airbag 48 is provided on one of the left and right sides of the seat back 4, and a second side airbag 49 is provided on the other of the left and right sides. In this embodiment, the first side airbag 48 is provided on the right side surface of the right rear side member 22, and the second side airbag 49 is provided on the left side surface of the left rear side member 22. Each of the first side airbag 48 and the second side airbag 49 extends upward and downward. The upper end of the first side airbag 48 is positioned higher than the upper end of the second side airbag 49. Furthermore, the first side airbag 48 is formed to be longer in the vertical direction than the second side airbag 49. In this embodiment, the seat 1 is the left seat of the vehicle, the first side airbag 48 is a far-side airbag located away from the side wall of the vehicle, and the second side airbag 49 is a near-side airbag located closer to the side wall of the vehicle.

[0153] In the seat 1, an inflatable and deflated fluid bag assembly 52 is disposed between the frame 20 and the skin members 13 and 17. The fluid bag assembly 52 is disposed on the front surface of the shoulder support member 32. In this embodiment, a single fluid supply device 53 is connected to both the left and right fluid bag assemblies 52. The left fluid bag assembly 52 is disposed between the left shoulder support member 32 and the cushion 16, while the right fluid bag assembly 52 is disposed between the right shoulder support member 32 and the cushion 16. In this embodiment, the fluid supplied to the fluid bag assemblies 52 is air, and the fluid supply device 53 comprises an air pump. In another embodiment, the fluid may be a liquid such as water or oil. The fluid supply device 53 is preferably disposed on the inner surface of one of the left and right rear side members 22. Preferably, the drive device 19A for driving the reclining mechanism 19 is disposed on the inner surface of the other of the left and right rear side members 22. That is, the fluid supply device 53 and the drive device 19A are disposed on the inner surfaces of different rear side members 22. Preferably, the drive device 19A comprises an electric motor and a reduction mechanism.

[0154] Each shoulder support member 32 includes a support surface 32F extending in a first direction and facing forward. The support surface F is formed by the first plate member 32A, the flexible member 32B, and the front surface of the second plate member 32C. Herein, one side in the first direction is referred to as the first side, and the other side in the first direction is referred to as the second side. In this embodiment, the left and right shoulder support members 32 are arranged on the left and right sides of the upper portion of the seat back 4 so that each support surface 32F faces forward and the first side is directed laterally inward and downward. Each shoulder support member 32 includes a side surface 51B perpendicular to the support surface 32F. In this embodiment, the shoulder support members 32 extend in the first direction.

[0155] The left and right shoulder support members 32 are respectively arranged on the left and right sides of the blower 46. Furthermore, the left and right shoulder support members 32 are provided on the left and right sides of the duct 46B. The right shoulder support member 32 is provided on the right side of the duct 46B, and the left shoulder support member 32 is provided on the left side of the duct 46B. Preferably, the lower ends of the left and right shoulder support members 32 are each positioned higher than the upper end of the lumbar support member 44. Also preferably, the lower ends of the left and right shoulder support members 32 are each positioned higher than the upper end of the second side airbag 49.

[0156] like Figure 5 and 8 As shown, the fluid bag assembly 52 includes a first fluid bag 56, a second fluid bag 57, and a third fluid bag 58. The first fluid bag 56 is disposed on the support surface 32F of the shoulder support member 32. The second fluid bag 57 includes a first connection portion 61 connected to the first fluid bag 56 at its end on the first side and communicates with the first fluid bag 56. The third fluid bag 58 includes a second connection portion 62 connected to the second fluid bag 57 at its end on the first side and communicates with the second fluid bag 57. Each of the first to third fluid bags 56 to 58 is formed by welding the edge portions of overlapping sheets. For example, the fluid bag can be formed by two sheets overlapping each other and having their edge portions bonded to each other. Alternatively, the fluid bag can be formed by a single sheet folded so that the folded portions overlap and the edge portions are bonded to each other.

[0157] First fluid bag 56 includes a first sheet 56A and a second sheet 56B that overlap each other. First sheet 56A and second sheet 56B are connected to each other via a third connecting member 56C that extends along their respective edge portions and forms a closed loop. Third connecting member 56C is preferably a member where first sheet 56A and second sheet 56B are welded or bonded together. An inlet pipe 63, which is an open-ended tube, is inserted between the edge portions of first sheet 56A and second sheet 56B, extending across third connecting member 56C. The outer peripheral surfaces of inlet pipe 63 and first sheet 56A and second sheet 56B are hermetically sealed.

[0158] The first fluid bag 56 contacts the support surface 32F at the first sheet 56A and extends in the first direction. At least one of the first sheet 56A and the second sheet 56B includes a tab 56D that protrudes laterally from the middle portion in the first direction. In this embodiment, the tab 56D is provided on the laterally inner edge of the middle portion in the first direction of each of the first sheet 56A and the second sheet 56B. The tabs 56D of the first and second sheets 56A, 56B are preferably connected to each other. The tab 56D is bent to extend along the fastening portion 32E of the shoulder support member 32 and is fastened to the fastening portion 32E by means of a fastening member 65 such as a clip or rivet. The first fluid bag 56 is secured to the shoulder support member 32 via the tab 56D. When viewed in a direction perpendicular to the support surface 32F of the shoulder support member 32, the end of the first fluid bag 56 on the first side is arranged in a position that coincides with the end of the shoulder support member 32 on the first side, and the end of the first fluid bag 56 on the second side is arranged in a position that coincides with the end of the shoulder support member 32 on the second side.

[0159] The second fluid bag 57 includes a third sheet 57A and a fourth sheet 57B stacked on top of each other. The third and fourth sheets 57A and 57B are connected by a fourth connecting member 57C, which extends along their respective edge portions and forms a closed loop. The fourth connecting member 57C is preferably a member where the third and fourth sheets 57A and 57B are welded or bonded to each other. The second fluid bag 57 extends in a first direction and overlaps the first fluid bag 56. The third sheet 57A of the second fluid bag 57 contacts the second sheet 56B of the first fluid bag 56. When viewed from a direction perpendicular to the support surface 32F of the shoulder support member 32, the end of the second fluid bag 57 on the first side is arranged to coincide with the end of the first fluid bag 56 on the first side, and the end of the second fluid bag 57 on the second side is arranged to coincide with the end of the first fluid bag 56 on the second side.

[0160] The end portion of the third sheet 57A on the first side and the end portion of the second sheet 56B on the first side are connected to each other via a first connecting member 61. The first connecting member 61 is preferably a member where the third sheet 57A and the second sheet 56B are welded or bonded to each other. The first connecting member 61 has a first side edge 61A as a side edge on the second side. The first side edge 61A extends linearly. The first fluid bag 56 and the second fluid bag 57 are connected via a first connecting hole 61B that passes through the first connecting member 61. The first connecting hole 61B is formed in the second sheet 56B and the third sheet 57A.

[0161] The third fluid bag 58 includes a fifth sheet 58A and a sixth sheet 58B that overlap each other. The fifth and sixth sheets 58A and 58B are connected by a fifth connecting member 58C that extends along their respective edge portions and forms a closed loop. The fifth connecting member 58C is preferably a member where the fifth and sixth sheets 58A and 58B are welded or bonded to each other. The third fluid bag 58 extends in the first direction and overlaps the second fluid bag 57. The fifth sheet 58A of the third fluid bag 58 contacts the fourth sheet 57B of the second fluid bag 57. When viewed perpendicular to the support surface 32F of the shoulder support member 32, the end of the third fluid bag 58 on the first side is offset toward the second side relative to the end of the second fluid bag 57 on the first side, and the end of the third fluid bag 58 on the second side is positioned so as to overlap with the end of the second fluid bag 57 on the second side. In other words, the length of the second fluid bag 57 in the first direction is longer than the length of the third fluid bag 58 in the first direction.

[0162] The end portion of the fifth sheet 58A on the first side and the middle portion of the fourth sheet 57B in the first direction are connected to each other via a second connecting member 62. The second connecting member 62 is preferably a member where the fourth sheet 57B and the fifth sheet 58A are welded or bonded to each other. The second connecting member 62 has a second side edge 62A as a side edge on the second side. The second side edge 62A extends linearly. The second fluid bag 57 and the third fluid bag 58 are connected via a second communication hole 62B that passes through the second connecting member 62. The second communication hole 62B is formed in the fourth sheet 57B and the fifth sheet 58A.

[0163] The introduction tubes 63 of the left and right fluid bag assemblies 52 are connected to the fluid supply device 53 via the conduit 67. The fluid bag assemblies 52 expand when the fluid is supplied, and contract when the fluid is discharged.

[0164] like Figure 3 and Figure 9 As shown in FIG. 5A , in the collapsed state of the fluid bag assembly 52, the first side edge 61A and the second side edge 62A extend in different directions when viewed from a direction perpendicular to the support surface 32F of the shoulder support member 32. That is, when viewed from a direction perpendicular to the support surface 32F of the shoulder support member 32, the angle defined between the first side edge 61A and the first direction is different from the angle defined between the second side edge 62A and the first direction. Furthermore, the second side edge 62A is positioned further away on the second side than the first side edge 61A.

[0165] The first side edge 61A and the second side edge 62A are preferably positioned lower than the central axis of the blower body 46A. Furthermore, the first side edge 61A and the second side edge 62A are preferably positioned lower than the upper end of the first side airbag 48. Furthermore, the upper end of the fluid bag assembly 52 is preferably positioned lower than the central axis of the blower body 46A. Furthermore, the upper end of the fluid bag assembly 52 is preferably positioned lower than the upper end of the first side airbag 48.

[0166] Each of the first to third fluid bags 56 to 58 has a flat surface and overlaps with one another in a deflated state. When the fluid supply device 53 is activated and air is supplied to the fluid bag assembly 52, the fluid bag assembly 52 expands. Air supplied from the fluid supply device 53 via the conduit 67 flows through the introduction tube 63 into the first fluid bag 56, then flows from the first fluid bag 56 into the second fluid bag 57 through the first communication hole 61B, and then flows from the second fluid bag 57 into the third fluid bag 58 through the second communication hole 62B. As a result, the fluid bag assembly 52 expands.

[0167] In the expanded state, the thickness of each of the first to third fluid bags 56 to 58 gradually increases from the edge portion toward the center portion. Figure 10 As shown, in the expanded state, the second fluid bag 57 is bent around the first side edge 61A, so that the end of the second fluid bag 57 on the second side is separated from the end of the first fluid bag 56 on the second side. Furthermore, the third fluid bag 58 is bent around the second side edge 62A, so that the end of the third fluid bag 58 on the second side is separated from the end of the second fluid bag 57 on the second side. Therefore, the end of the fluid bag assembly 52 on the second side is more expanded in a direction perpendicular to the support surface 32F of the shoulder support member 32 than the end of the fluid bag assembly 52 on the first side.

[0168] In the contracted state of the left and right fluid bag assemblies 52, each of the first side edge 61A and the second side edge 62A extends obliquely downward in a laterally outward direction when viewed from the front. Therefore, when inflated, the end of the second fluid bag 57 on the second side moves or rotates laterally inward and downward around the first side edge 61A. Similarly, when inflated, the end of the third fluid bag 58 on the second side moves or rotates laterally inward and downward around the second side edge 62A. Since the first side edge 61A and the second side edge 62A extend in different directions from each other, the end of the second fluid bag 57 on the second side and the end of the third fluid bag 58 on the second side move in different directions. In this embodiment, when inflated, the end of the second fluid bag 57 on the second side moves forward and laterally inward and downward, while the end of the third fluid bag 58 on the second side moves forward and laterally inward. Therefore, the fluid bag assembly 52 as Figure 9 (A) to 9(C) shown in expansion.

[0169] like Figure 2 As shown, the seat cushion frame 11 includes left and right cushion side members 71 extending in the front-to-rear direction, a front member 72 extending transversely and coupling the front ends of the left and right cushion side members 71 to each other, a rear member 73 extending transversely and coupling the rear ends of the left and right cushion side members 71 to each other, and a movable frame 74 supported on the front member 72 so as to be movable forward and backward. A hip support 75 for supporting the occupant's hips extends between the front member 72 and the rear member 73. The hip support 75 preferably includes a plate-like member made of resin and a plurality of wire springs connected to the plate-like member.

[0170] The movable frame 74 includes an upper plate 74A provided on the upper surface of the front member 72 and supported so as to be movable forward and backward relative to the front member 72, and a front plate 74B extending downward from the front end of the upper plate 74A so as to be provided in front of the front member 72. The left and right ends of the rear portion of the upper plate 74A extend further backward than the central portion of the upper plate 74A. When viewed in the transverse direction, the front plate 74B is formed into an arc shape that protrudes forward.

[0171] like Figure 12 and 13 As shown, a downwardly recessed accommodating recess 72A is formed in the transverse central portion of the upper surface of the front member 72. The front and rear ends of the accommodating recess 72A can reach the front and rear ends of the front member 72. A pair of left and right rails 77A extending in the front-to-back direction are provided on the left and right portions of the upper surface of the front member 72. Each of the left and right rails 77A is provided with a slider 77B so as to be movable forward and backward relative to the rails 77A. The upper plate 74A of the front member 72 is connected to the left and right sliders 77B by bolts 78. Thus, the movable frame 74 is provided on the front member 72 so as to be movable forward and backward through the sliders 77B and the rails 77A. The accommodating recess 72A is provided in the portion of the front member 72 located below the upper plate 74A.

[0172] As the upper plate 74A shifts forward and backward, the movable frame 74 moves between the initial position and the protruding position relative to the front member 72. The movable frame 74 moves forward from the initial position to reach the protruding position. In addition, the movable frame 74 moves backward from the protruding position to return to the initial position.

[0173] The cushion 12 of the seat cushion 3 is arranged to cover the upper and front surfaces of the movable frame 74. When the movable frame 74 moves from the initial position to the protruding position, the movable frame 74 slides relative to the cushion 12. Even when the movable frame 74 is in the protruding position, the cushion 12 has a sufficient length to cover the front plate 74B of the movable frame 74. Preferably, when the movable frame 74 is in the initial position, the front edge of the cushion 12 extends further downward than the lower edge of the front plate 74B of the movable frame 74.

[0174] The seat 1 further includes an actuator 80 for moving the movable frame 74 forward and rearward relative to the front member 72. The actuator 80 includes a first actuator 81 for pushing the movable frame 74 forward, a second actuator 82 for pushing the movable frame 74 rearward, a housing 85 for accommodating the first actuator 81 and the second actuator 82, and a control device (not shown in the drawings) for controlling the urging force generated by each of the first actuator 81 and the second actuator 82.

[0175] like Figure 12 As shown, each of the first actuator 81 and the second actuator 82 is formed of a fluid bag assembly that expands when supplied with compressed air and contracts when the compressed air is discharged. Preferably, the control device includes a compressor for generating compressed air, a connecting pipe connecting the compressor to the first actuator 81, a connecting pipe connecting the compressor to the second actuator 82, a control valve provided in each connecting pipe, an electronic control unit (ECU) for controlling the compressor and the control valve, an operating switch for inputting a signal to the electronic control unit, etc.

[0176] The housing 85 is disposed in the accommodating recess 72A and includes a bottom wall 85A extending in the front-to-back direction, a front wall 85B extending upward from the front end of the bottom wall 85A, and a rear wall 85C extending upward from the rear end of the bottom wall 85A. The bottom wall 85A is secured to the bottom of the accommodating recess 72A. Furthermore, the housing 85 preferably includes left and right end walls 85D extending in the front-to-back direction along the left and right edges of the bottom wall 85A, respectively, and each end wall is connected to the front wall 85B and the rear wall 85C. The bottom wall 85A, the front wall 85B, the rear wall 85C, and the left and right end walls 85D cooperate with each other to form a box structure that opens upward.

[0177] A downwardly extending pressure plate 74C is provided in the center portion of the rear end of the upper plate 74A of the movable frame 74. The pressure plate 74C is provided between the front wall 85B and the rear wall 85C. Furthermore, the pressure plate 74C is arranged between the left and right end walls 85D. The first actuator 81 is provided between the front wall 85B and the pressure plate 74C, and the second actuator 82 is provided between the pressure plate 74C and the rear wall 85C.

[0178] According to the extension and retraction of the first actuator 81 and the second actuator 82 , the pressure receiving plate 74C moves relative to the front wall 85B and the rear wall 85C, and the movable frame 74 moves forward and rearward relative to the front member 72 .

[0179] When compressed air is supplied to the corresponding first and second actuators 81, 82, the first and second actuators 81, 82 expand. When the control valve is in the holding state, air flow to the corresponding first and second actuators 81, 82 is blocked, and the first and second actuators 81, 82 maintain their sizes. When the control valve is in the exhaust state, the compressed air in the corresponding first and second actuators 81, 82 is exhausted to the outside, and the first and second actuators 81, 82 contract.

[0180] The rear end of the cover member 86 is connected to the rear portion of the accommodating recess 72A. The cover member 86 includes a flange 86A secured to the portion of the accommodating recess 72A behind the rear wall 85C of the housing 85, a vertical plate member 86B extending upward from the front edge of the flange 86A behind the rear wall 85C, and a horizontal plate member 86C extending forward from the upper end of the vertical plate member 86B to be positioned above the upper plate 74A of the movable frame 74. The horizontal plate member 86C covers the rear portion of the upper plate 74A. The horizontal plate member 86C supports the cushion 12 from below.

[0181] In the shoulder support member 32 of the seat 1 described above, the second plate member 32C is displaceable relative to the first plate member 32A by deformation of the flexible member 32B. Therefore, when the shoulder support member 32 is pushed by the seated occupant's shoulders, the first plate member 32A and the second plate member 32C are able to move along the shoulders. This provides a seat 1 that comfortably supports the occupant's shoulders.

[0182] Since the first plate member 32A and the flexible member 32B are disposed between the left and right rear side members 22 when viewed from the front, and since at least a portion of the second plate member 32C is disposed in front of the rear side members 22, the first plate member 32A can be displaced rearwardly relative to the second plate member 32C along the back of the seated person. Furthermore, since the flexible member 32B extends upward and downward along the transversely inner edges of the rear side members 22 when viewed from the front, the first plate member 32A can be displaced rearwardly without interfering with the rear side members 22. Since the flexible member 32B has the slit 39, the first plate member 32A can be easily displaced relative to the second plate member 32C.

[0183] Since the second plate member 32C and the rear side member 22 are in contact with each other in the front-rear direction, the position of the second plate member 32C in the seat back 4 can be fixed. When viewed from the front, the second plate member 32C extends along the rear side member 22. Since the second plate member 32C is present between the shoulders of the seated person and the rear side member 22, the shoulders of the seated person can be comfortably supported.

[0184] Since the left and right shoulder support members 32 are provided on the left and right wire members 31 , respectively, the left and right shoulder support members 32 can be displaced independently of each other in such a manner as to follow the shoulders of the seated person.

[0185] The fluid bag assembly 52 causes the portion of the seat back 4 corresponding to the seat occupant's shoulders to bulge laterally inward and downward. This allows for a seat back 4 that conforms to the position and shape of the seat occupant's shoulders. Since each of the left and right fluid bag assemblies 52 inflates forward and laterally inward and downward, the fluid bag assemblies 52 can be positioned to avoid interfering with other devices, such as the blower system, lumbar support member 44, and proximal airbag, depending on the seat occupant's body shape.

[0186] In the seat 1 according to this embodiment, since the first side edge 61A and the second side edge 62A extend in different directions, it is possible to change the expansion direction of the second fluid bag 57 and the expansion direction of the third fluid bag 58. This allows for a variety of shapes in the fluid bag assembly 52 when inflated. The first to third fluid bags 56 to 58 are connected at the first connecting member 61 and the second connecting member 62, and the first and second communicating holes 61B and 62B are formed in the first and second connecting members 61 and 62, respectively, resulting in a simple structure. The tongue 56D of the first fluid bag 56 is bent and fixed to the side surface 51B perpendicular to the support surface 32F, thereby enabling the shoulder support member 51 to be made compact in size.

[0187] The fluid bag assembly 52 causes the portion of the seat back 4 corresponding to the seat occupant's shoulders to bulge laterally inward and downward. This allows for a seat back 4 that conforms to the position and shape of the seat occupant's shoulders. Since each of the left and right fluid bag assemblies inflates forward and laterally inward and downward, the fluid bag assembly 52 can be positioned to avoid interfering with other devices such as the blower unit, lumbar support member 44, and proximal airbag, depending on the seat occupant's body shape.

[0188] While the specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be modified and varied in various ways. In another embodiment, the upper cross-member 23 and the intermediate cross-member 25 can be integrally formed. Furthermore, the intermediate cross-member 25 can be omitted, and the upper end of the wire member 31 can be connected to the upper cross-member 23.

[0189] like Figure 11 As shown, the second plate member 32C and the right rear member 22 are in contact with each other in the front-to-back direction via a cushioning material 38. The cushioning material 38 is preferably a flexible member, such as a non-woven fabric or a rubber sheet. The cushioning material 38 is preferably inserted between the butt joint 37 and the front surface of the right rear member 22. When the second plate member 32C contacts the front surface of the right rear member 22 via the cushioning material 38, the generation of frictional and rattling sounds can be prevented.

[0190] Furthermore, the rear surface of the second plate member 32C may be provided with a reinforcement structure 41. The reinforcement structure 41 increases the rigidity of the second plate member 32C. Preferably, the reinforcement structure 41 is a rib protruding from the rear surface of the second plate member 32C. The reinforcement structure 41 is preferably provided on the upper portion of the rear surface of the second plate member 32C.

[0191] The fluid bag assembly 52 may be provided in the seat cushion 3 and / or the headrest 29. Furthermore, the fluid bag assembly 52 may include four or more fluid bags, rather than being limited to the three fluid bags 56 to 58. For example, the fluid bag assembly 52 may include a fourth fluid bag connected to the third fluid bag 58 and a fifth fluid bag connected to the fourth fluid bag.

[0192] In an embodiment in which some of the above embodiments are improved, as shown in FIG. Figure 14 As shown, the fluid bag assembly 52 can be positioned near the outer edge of the blower 46. In this case, each fluid bag assembly 52 preferably has a laterally outwardly recessed recess 101 in its laterally inner edge, with the left and right sides of the blower 46 positioned in the corresponding recess 101. Each recess 101 is preferably formed along the outer edge of the blower 46. For example, it is preferred that the blower 100 be cylindrical, and each recess 101 be arcuate with a radius equal to that of the blower 100. Thus, it is possible to increase the size of each fluid bag assembly 52 while avoiding interference between the fluid bag assembly 52 and the blower 46. Furthermore, the support plate 102 of the lumbar support member 44 can extend laterally so that the left and right ends reach the left and right rear side members 22. The blower 46 can be supported on the support plate 102. Furthermore, the support plate 102 of the lumbar support member 44 can constitute a shoulder support for each fluid bag assembly 52. In this case, it is preferred that the fluid bag assembly 52 is connected to the support plate 102 .

[0193] Reference Signs List

[0194] 1 seat

[0195] 3 seat cushions

[0196] 4 seat backs

[0197] 15 Seat back frame

[0198] 22 rear side member

[0199] 23 Upper cross member

[0200] 24 Lower cross member

[0201] 25 intermediate cross-span members

[0202] 31 wire components

[0203] 31A upper end

[0204] 31B upper middle part

[0205] 31C lower middle part

[0206] 31D lower end

[0207] 31E connection

[0208] 32 shoulder support member

[0209] 32A first plate component

[0210] 32B flexible parts

[0211] 32C second plate component

[0212] 32D inner edge

[0213] 32E fastening parts

[0214] 34 first locking portion

[0215] 35 second locking portion

[0216] 36 placement components

[0217] 37 docking part

[0218] 38 cushioning material

[0219] 39 Slit

[0220] 41 Strengthening structure

[0221] 44 lumbar support member

[0222] 46 blower

[0223] 52 fluid bag assembly

Claims

1. A vehicle seat comprising a seat cushion and a seat back, wherein: The seat back comprises: left and right side members extending upward and downward; a lower cross member extending laterally and connected to the left and right side members; a cross member extending laterally above the lower cross member and connected to the left and right side members; a pair of left and right wire members extending upward and downward and connected to the lower cross-member and the cross-member; and a pair of left and right shoulder support members corresponding to the left and right wire members and supported on upper portions of the wire members, and The shoulder support member comprises: a first plate member facing in a front-rear direction and connected to the upper portion of the wire member; and A second plate member faces the front-rear direction and is connected to the first plate member via a flexible member.

2. The vehicle seat according to claim 1, wherein A plate-like lumbar support member facing the front-rear direction is supported on a lower portion of the wire member.

3. The vehicle seat according to claim 1 or 2, wherein: The wire member includes a first portion and a second portion inclined relative to each other via a bent portion, and The first plate part of the shoulder support member includes a first locking portion that locks the first portion and a second locking portion that locks the second portion.

4. The vehicle seat according to claim 3, wherein The first plate part of the shoulder support member includes a seating part located between the first locking portion and the second locking portion, the seating part contacting the first portion and the second portion.

5. The vehicle seat according to claim 1 or 2, wherein: When viewed from the front, the first plate member and the flexible member are arranged between the left and right side members, and at least a portion of the second plate member is provided in front of the side members.

6. The vehicle seat according to claim 5, wherein When viewed from the front, the flexible part extends upward and downward along the laterally inner edges of the side members.

7. The vehicle seat according to claim 6, wherein: The flexible member has a slit that penetrates the flexible member in the front-rear direction and extends upward and downward with an open lower end.

8. The vehicle seat according to claim 1 or 2, wherein: A fluid bag assembly that expands when liquid is supplied is provided on the front surface of the shoulder support member.

9. A vehicle seat comprising a seat cushion and a seat back, wherein: The seat back comprises: left and right side members extending upward and downward; a lower cross member extending laterally and connected to the left and right side members; a cross member extending laterally above the lower cross member and connected to the left and right side members; at least one wire member extending upward and downward and connected to the lower cross-member and the cross-member; and at least one shoulder support member supported on an upper portion of the wire member, and A fluid bag assembly that expands when liquid is supplied is provided on the front surface of the shoulder support member. The shoulder support member comprises: a first plate member facing in a front-to-rear direction and connected to the upper portion of the wire member; a second plate member facing the front-rear direction and connected to the first plate member via a flexible member; a support surface extending in a first direction and facing forward, A fluid supply is connected to the fluid bag assembly, One side in the first direction is referred to as a first side and the other side in the first direction is referred to as a second side, The fluid bag assembly comprises: a first fluid bag disposed on the support surface; a second fluid bag including a first connection part connected to the first fluid bag in an end portion on the first side and communicating with the first fluid bag; and a third fluid bag including, in an end portion on the first side, a second connection part connected to the second fluid bag and communicating with the second fluid bag, and In the collapsed state of the fluid bag assembly, when viewed in a direction perpendicular to the supporting surface, a first side edge and a second side edge each extend linearly and in mutually different directions, wherein the first side edge is a side edge of the first connecting part on the second side, and the second side edge is a side edge of the second connecting part on the second side.

10. The vehicle seat according to claim 9, wherein The second side edge is arranged further on the second side than the first side edge.

11. The vehicle seat according to claim 9, wherein The length of the second fluid bag in the first direction is longer than the length of the third fluid bag in the first direction.

12. The vehicle seat according to claim 9, wherein The fluid supply device is connected to the first fluid bag, The first fluid bag and the second fluid bag are connected by a first communication hole passing through the first connecting member, and The second fluid bag and the third fluid bag are connected via a second communication hole passing through the second connecting member.

13. The vehicle seat according to claim 9, wherein The first fluid bag, the second fluid bag, and the third fluid bag extend in the first direction.

14. The vehicle seat according to claim 9, wherein The first fluid bag includes a tongue protruding to one side, and The tongue is fastened to a side surface perpendicular to the support surface of the shoulder support member.

15. The vehicle seat according to claim 9, wherein The shoulder support member includes a pair of left and right shoulder support members, and the fluid bag assembly includes a pair of left and right fluid bag assemblies, The left and right shoulder support members are arranged on left and right portions of an upper portion of the seat back so that the first side becomes a transversely inner side and a lower side, and In the collapsed state of the fluid bag assembly, each of the first side edge and the second side edge extends obliquely downward in a laterally outward direction when viewed from the front.

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