Vehicle seat

Abstract

The invention provides a vehicle seat which can restrain the discomfort of a seated person at a position where a belt retractor is assembled. A vehicle seat is provided with: a backrest frame (10); and a belt retractor (42) attached to the backrest frame and used for winding the safety belt. The backrest frame (10) comprises a plate-shaped rear frame (20) and a front frame (30) assembled on the front surface of the rear frame. A first through-hole (22) is formed in the rear frame (20), and a second through-hole (32) is formed in the front frame (30) at a position facing the first through-hole (22). The belt retractor (42) is provided inside the first through-hole (22) and the second through-hole (32) in the backrest frame (10), and is disposed at a position overlapping the rear frame (20) and the front frame (30) in the thickness direction of the backrest frame.

Description

Technical Field

[0001] The present invention relates to a vehicle seat, and in particular to a vehicle seat comprising a belt retractor, wherein the belt retractor is installed on a seat back and is used to wind up a safety belt. Background Art

[0002] Conventionally, there is known a rear seat for a vehicle including a backrest frame serving as a frame of a seat back and a belt retractor mounted on a front surface of the backrest frame and used to retract a seat belt (for example, Patent Document 1).

[0003] The vehicle seat described in Patent Document 1 includes a backrest frame and a belt retractor mounted on a front surface of the backrest frame.

[0004] The backrest frame includes a plate-shaped rear frame constituting its outer shape, and a front frame assembled to the front surface of the rear frame. A through hole is formed in the front frame and penetrates the front frame in the thickness direction. Moreover, the belt retractor is arranged inside the through hole of the backrest frame and is arranged at a position overlapping with the front frame in the thickness direction of the backrest frame.

[0005] [Prior art literature]

[0006] [Patent Document]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2012-162225 Summary of the invention

[0008] [Problems to be solved by the invention]

[0009] In the vehicle seat including the belt retractor as in Patent Document 1, the belt retractor is assembled to the front surface of the backrest frame. Therefore, the seated person may feel uncomfortable at the portion of the seat back where the belt retractor is assembled. In other words, the seated person's sitting feeling may be affected.

[0010] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a vehicle seat that makes the sitting feeling better than before.

[0011] Another object of the present invention is to provide a vehicle seat including a belt retractor, wherein the vehicle seat can suppress a seated person's sense of discomfort at a location where the belt retractor is assembled.

[0012] [Technical means to solve the problem]

[0013] The above-mentioned problem can be solved by the following manner: The vehicle seat according to the present invention is a vehicle seat, which includes: a backrest frame, which serves as a skeleton of a seat back; and a belt retractor, which is installed on the backrest frame and is used to wind up a seat belt, the backrest frame includes a plate-shaped rear frame constituting the backrest frame, and a front frame assembled on the front surface of the rear frame, the rear frame having a first through hole that penetrates the rear frame in the thickness direction, the front frame having a second through hole that is arranged at a position opposite to the first through hole and penetrates the front frame in the thickness direction, the front frame being assembled to the rear frame in a state in which the first through hole and the second through hole are connected, the belt retractor is arranged inside the first through hole and the second through hole in the backrest frame, and is configured at a position overlapping with the rear frame and the front frame in the thickness direction of the backrest frame.

[0014] With the structure, it is possible to realize a vehicle seat including a belt retractor, which makes the sitting feeling better than before.

[0015] In detail, the belt retractor is disposed inside the first through hole and the second through hole of the backrest frame and is arranged at a position overlapping with the rear frame and the front frame in the thickness direction of the backrest frame. That is, the belt retractor is prevented from protruding forward from the backrest frame, and the seated person's sense of discomfort is suppressed at the portion of the seat back where the belt retractor is assembled.

[0016] In more detail, a vehicle seat is generally mainly composed of a seat frame, a cushion material, and a surface material, and by minimizing the protrusion of the belt retractor forward from the backrest frame, the thickness of the cushion material can be ensured, thereby providing a good sitting feeling.

[0017] In this case, the rear end portion of the belt retractor may be arranged at a position further rearward than the rear frame in the thickness direction of the back frame.

[0018] With this structure, it is possible to further suppress the belt retractor from protruding forward from the backrest frame, thereby further improving the seating comfort.

[0019] In this case, the first through hole and the second through hole may be formed larger than the belt retractor in the vertical direction and the width direction of the back frame.

[0020] With the above structure, the belt retractor can be easily assembled.

[0021] At this time, the belt retractor can be rotated to wind up the seat belt.

[0022] The rotation axis of the belt retractor is arranged at a rearward position relative to the front frame in the thickness direction of the back frame.

[0023] Furthermore, the belt retractor may be rotated to retract the seat belt, and a rotation axis of the belt retractor may be disposed forward of the rear frame in a thickness direction of the back frame.

[0024] With this structure, the rotating shaft of the belt retractor can be suitably protected in the thickness direction of the back frame.

[0025] At this time, the backrest frame may include a retractor bracket for mounting the belt retractor, the retractor bracket being disposed inside the first through hole and the second through hole and arranged at a position overlapping the rear frame and the front frame in a thickness direction of the backrest frame.

[0026] By including the retractor bracket in this way, the belt retractor can be appropriately assembled to the back frame. In addition, the belt retractor can be suppressed from extending forward from the back frame.

[0027] In this case, the retractor bracket may include a retractor mounting portion for mounting the belt retractor, and the retractor mounting portion may be arranged at a rearward position relative to the front frame in a thickness direction of the back frame.

[0028] With the above structure, the belt retractor can be suitably protected from the seat front side.

[0029] At this time, the retractor bracket may include a frame mounting portion for mounting on the front surface of the front frame, and a front reinforcement portion may be formed on a portion of the front surface of the front frame where the frame mounting portion is mounted.

[0030] Furthermore, a rear reinforcement portion extending along the edge of the first through hole may be formed at the edge of the first through hole in the rear frame.

[0031] With this structure, the rigidity of the portion of the backrest frame to which the belt retractor is assembled can be improved.

[0032] At this time, it may include: a switching device that switches the seat back between a normal state and a moving state in which the seat back has moved from the normal state, the switching device is arranged at a side portion of the backrest frame and has a locking member that locks the moving action of the seat back in the normal state, and the locking member and the belt retractor are arranged at the same height position in the backrest frame.

[0033] The above structure can improve the rigidity of the portion of the back frame to which the belt retractor is assembled. That is, even when a load is applied to the seat back (back frame) from the outside, the assembly rigidity of the belt retractor can be appropriately ensured by arranging the belt retractor at a position relatively close to the locking member.

[0034] [Effects of the Invention]

[0035] According to the present invention, a vehicle seat can be realized, which makes the seat feel better than before. In addition, in a vehicle seat including a belt retractor, even in a portion where the belt retractor is assembled, the seated person's sense of discomfort can be suppressed.

[0036] Furthermore, according to the present invention, it is possible to suppress the belt retractor from protruding forward from the backrest frame, thereby making the sitting feeling good.

[0037] Furthermore, according to the present invention, the belt retractor can be easily assembled.

[0038] Furthermore, according to the present invention, the rotating shaft of the belt retractor can be suitably protected in the thickness direction of the back frame.

[0039] Furthermore, according to the present invention, the belt retractor is suitably assembled to the seatback frame by including the retractor bracket.

[0040] Furthermore, according to the present invention, the belt retractor can be suitably protected from the seat front side.

[0041] Furthermore, according to the present invention, the rigidity of the portion of the backrest frame to which the belt retractor is assembled can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a perspective view of the vehicle seat according to the present embodiment.

[0043] Figure 2 It is a three-dimensional view of the backrest frame, belt retractor, and retractor bracket.

[0044] Figure 3 It is an exploded perspective view of the backrest frame, belt retractor, and retractor bracket.

[0045] Figure 4 This is an exploded perspective view of the backrest frame, belt retractor, and retractor bracket when viewed from behind the seat.

[0046] Figure 5 yes Figure 2 The enlarged view of the main part is a view showing the retractor bracket and the belt guide bracket.

[0047] Figure 6This is a perspective view of the backrest frame, belt retractor, and retractor bracket when viewed from behind the seat (enlarged view of the main parts).

[0048] Figure 7 It is a side section view of a backrest frame, a belt retractor, and a retractor bracket.

[0049] Figure 8 yes Figure 2 The main part is an enlarged view showing a column guide.

[0050] Fig. 9 It is a front view of the backrest frame, the mounting bracket and the axle support bracket.

[0051] [Explanation of Symbols]

[0052] S: Seats for transportation

[0053] 1: Seat back

[0054] 1a, 2a, 3a: Cushioning material

[0055] 1b, 2b, 3b: Surface material

[0056] 2: Seat cushion

[0057] 3: Headrest

[0058] 4: Handrails

[0059] 10: Backrest frame

[0060] 20: Rear frame

[0061] 21: Frame body

[0062] 21a: Upper flange

[0063] 21b: Lower flange

[0064] 21c: Right end flange

[0065] 21d: Left end flange

[0066] 21e, 21f, 21g, 21h: Front bulge

[0067] 22: First through hole

[0068] 22a: Reinforced flange (rear reinforcement)

[0069] 23: Body installation

[0070] 24: Column mounting part

[0071] 25: Anchor installation part

[0072] 26: Shaft mounting part

[0073] 27: Handrail installation

[0074] 30: Front frame

[0075] 31: Frame body

[0076] 31a: Upper flange

[0077] 31b: Lower flange

[0078] 31c: Right end flange

[0079] 31d: Left end flange

[0080] 31e, 31f: Front bulge

[0081] 31g, 31h, 31i: rear bulge

[0082] 31j: Reinforced ribs

[0083] 32: Second through hole

[0084] 32a: Reinforcement (front reinforcement)

[0085] 33: Body installation

[0086] 34: Column mounting part

[0087] 35: Anchor mounting portion (anchor mounting hole)

[0088] 36: Shaft mounting part

[0089] 37: Handrail installation

[0090] 38: Column guide

[0091] 38a: Opening

[0092] 38b, 38c: Fixed part

[0093] 39: Child seat anchor

[0094] 40: Seat belt device

[0095] 41: Seat belts

[0096] 41a: with buckle

[0097] 42: With retractor

[0098] 42a: Retractor body

[0099] 42b: Rotation axis

[0100] 42c: Mounting portion (mounting hole)

[0101] 42d: Positioning unit

[0102] 42e: rear end

[0103] 43: With guide

[0104] 50: Retractor bracket

[0105] 50a: Main body wall

[0106] 50b: Bottom wall

[0107] 50c: Side wall

[0108] 50d: bulge

[0109] 51: Retractor mounting part (mounting hole)

[0110] 52: Retractor positioning part (positioning hook)

[0111] 53: First frame mounting portion / frame mounting portion

[0112] 54: Second frame mounting portion / frame mounting portion

[0113] 55: Third frame installation part / frame installation part

[0114] 55a: Anterior wall

[0115] 55b: Upper wall

[0116] 55c: Side wall

[0117] 55d: Reinforced wall

[0118] 56: Mounting bolts

[0119] 60: Bracket with guide

[0120] 60a: Front wall

[0121] 60b: Upper wall

[0122] 60c: Bottom wall

[0123] 60d: rear wall

[0124] 61: Frame installation

[0125] 62: Guide support portion

[0126] 70: Support feet

[0127] 71: Main body of the foot

[0128] 72: Foot connection

[0129] 73: Foot holding member

[0130] 80: Switching device

[0131] 81: Car body mounting bracket

[0132] 82: Locking components

[0133] 83: Joystick

[0134] 84: Placement bracket

[0135] 84a: Installation

[0136] 85: Intermediate bracket

[0137] 85a: Bottom wall

[0138] 85b: Outer wall

[0139] 85c: shaft support

[0140] 86: Pivot bracket

[0141] 86a: Bottom wall

[0142] 86b: Outer wall

[0143] 86c: shaft support

[0144] 87: Rotation axis

[0145] 90: Armrest locking device

[0146] 91: Handrail bracket DETAILED DESCRIPTION

[0147] Below, refer to Figures 1 to 9 Embodiments of the present invention will be described.

[0148] This embodiment relates to a vehicle seat including: a seatback frame; and a belt retractor assembled to the seatback frame and used to retract a seatbelt, wherein the vehicle seat can suppress a seated person's sense of discomfort at a location where the belt retractor is assembled.

[0149] In addition, the side on which the occupant sits with respect to the seat back of the vehicle seat is the "front side". In addition, the travel direction of the vehicle is the "front-rear direction", and the left-right direction when the vehicle is facing the travel direction is the "left-right direction" of the vehicle seat.

[0150] like Figure 1 As shown, the vehicle seat S is, for example, a rear seat corresponding to a rear seat of a vehicle, and includes a main seat and a sub-seat which are arranged side by side in a seat width direction.

[0151] The vehicle seat S is a seat capable of two seat arrangements: a "normal state" in which an occupant can sit, and a "storage state (mobile state)" in which the seat body is stored in the storage floor.

[0152] Specifically, regarding the vehicle seat S, when the occupant operates the vehicle seat S from the "normal state", Figure 1 When the operating lever 83 shown in the figure is pulled, the seat body is tilted forward and folded, thereby switching to the "storage state" stored in the vehicle body floor. In addition, the seat body is manually lifted upward by the occupant from the "storage state" and restored to the "normal state".

[0153] like Figure 1 , Figure 2 As shown, the vehicle seat S includes: a seat body having a seat back 1, a seat cushion 2, a headrest 3 and an armrest 4; a seat belt device 40, which is respectively installed inside the seat back 1 and is used to restrain the upper body of the seated person; a retractor bracket 50, which is used to assemble the belt retractor 42 of the seat belt device 40; and a belt guide bracket 60, which is used to guide the seat belt 41 extending from the belt retractor 42.

[0154] In addition, the vehicle seat S includes: a support leg 70, which is installed between the seat cushion 2 and the vehicle body floor and supports the seat body; a switching device 80, which is installed on the side part of the seat back 1 and switches the seat body from the "normal state" to the "storage state"; and an armrest locking device 90, which connects the armrest 4 to the seat back 1 in a rotatable manner.

[0155] like Figure 1 , Figure 2 As shown, the seat back 1 is a backrest supporting the back of an occupant from behind, and includes a back frame 10 forming a framework, a cushion material 1a placed on the back frame 10, and a surface material 1b covering the back frame 10 and the cushion material 1a.

[0156] The seat cushion 2 is a seat portion that supports an occupant from below, and includes a cushion frame that serves as a framework, a cushion material 2a that is placed on the cushion frame, and a surface material 2b that covers the cushion frame and the cushion material 2a.

[0157] The headrest 3 supports the head of the occupant from behind, and includes a headrest column serving as a core material, a cushion material 3a placed on the headrest column, and a surface material 3b covering the headrest column and the cushion material 3a.

[0158] The armrest 4 is a member that supports the arm of the seated person from below, and is also called a center armrest.

[0159] like Figure 2 to Figure 4As shown, the back frame 10 is formed of a substantially rectangular frame body serving as a framework of the seat back 1 , and includes a plate-like rear frame 20 constituting the outer shape of the back frame 10 and a plate-like front frame 30 assembled to the front surface of the rear frame 20 .

[0160] Specifically, the back frame 10 is formed by combining the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10 .

[0161] For example, the rear frame 20 and the front frame 30 may be integrally assembled by welding them while they are facing each other (by laser welding from the front of the seat or the rear of the seat).

[0162] like Figure 2 to Figure 4 As shown, the rear frame 20 is a plate-shaped panel frame, including: a rectangular frame body 21; a first through hole 22, for assembling the belt retractor 42; a body mounting portion 23, for assembling the switching device 80 (body mounting bracket 81); a column mounting portion 24, for assembling the column guide 38; an anchor mounting portion 25, for assembling the child seat anchor 39; an axis mounting portion 26, for assembling the switching device 80 (placement bracket 84); and an armrest mounting portion 27, for assembling the armrest 4 (armrest bracket 91).

[0163] The frame body 21 has a concavo-convex structure in which a part of the frame body 21 bulges forward and backward. In addition, a flange is formed on the outer edge of the frame body 21 .

[0164] Specifically, an upper flange 21a, a lower flange 21b, a right flange 21c, and a left flange 21d are formed on the outer edge of the frame body 21. In addition, a front bulge 21e and a front bulge 21f are formed on the left and right side portions and the lower portion of the frame body 21, respectively. In addition, a front bulge 21g and a front bulge 21h are formed on the diagonal line of the frame body 21, which bulges forward.

[0165] Therefore, the rigidity of the rear frame 20 can be improved.

[0166] In addition, a plurality of openings are formed at intervals in the up-down direction and the left-right direction on the front surface of the frame body 21. Therefore, the rear frame 20 can be reduced in weight.

[0167] The first through hole 22 is a through hole having a substantially rectangular shape that penetrates the rear frame 20 in the thickness direction, and is formed in an upper portion of the rear frame 20 .

[0168] The first through hole 22 , the left and right vehicle body mounting portions 23 , and the left and right pillar mounting portions 24 are arranged at positions overlapping each other in the up-down direction (at the same height position).

[0169] In addition, the left and right shaft mounting portions 26 and the armrest mounting portion 27 are arranged at positions overlapping each other in the up-down direction (at the same height position).

[0170] like Figure 2 to Figure 4 As shown, the front frame 30 is a plate-shaped panel frame, including: a rectangular frame body 31; a second through hole 32 for assembling the belt retractor 42; a body mounting portion 33 for assembling the switching device 80 (body mounting bracket 81); a column mounting portion 34 for assembling the column guide 38; an anchor mounting portion 35 (anchor mounting hole) for assembling the child seat anchor 39; an axis mounting portion 36 for assembling the switching device 80 (placement bracket 84); and an armrest mounting portion 37 for assembling the armrest 4 (armrest bracket 91).

[0171] The frame body 31 has a concavo-convex structure in which a part of the frame body 31 bulges forward and backward. In addition, a flange is formed on the outer edge of the frame body 31 .

[0172] Specifically, an upper flange 31a, a lower flange 31b, a right flange 31c, and a left flange 31d are formed on the outer edge of the frame body 31. In addition, a front bulge 31e and a front bulge 31f are formed on the left and right side portions and the lower end portion of the frame body 31, respectively. In addition, a rear bulge 31g and a rear bulge 31h are formed on the diagonal line of the frame body 31, respectively. In addition, a rear bulge 31i is also formed in the central portion of the frame body 31.

[0173] Therefore, it is possible to improve the rigidity of the front frame 30. In addition, by abutting and welding the rear bulge of the front frame 30 and the front bulge of the rear frame 20, it is possible to further improve the rigidity of the back frame 10.

[0174] The front frame 30 is assembled to be attached to the rear frame 20 in a state where the first through hole 22 and the second through hole 32 communicate with each other.

[0175] The second through hole 32 is a substantially rectangular through hole that penetrates the front frame 30 in the thickness direction and is formed in the upper portion of the front frame 30. The second through hole 32 is disposed at a position facing the first through hole 22.

[0176] The second through hole 32 , the left and right vehicle body mounting portions 33 , and the left and right pillar mounting portions 34 are arranged at positions overlapping each other in the up-down direction (at the same height position).

[0177] In addition, the left and right shaft mounting portions 36 and the armrest mounting portions 37 are arranged at positions overlapping each other in the up-down direction (at the same height position).

[0178] In the structure, if Figure 3 , Figure 4 As shown, the first through hole 22 and the second through hole 32 are formed larger than the belt retractor 42 in the vertical direction and the width direction of the back frame 10 .

[0179] Therefore, the belt retractor 42 can be easily assembled.

[0180] In the structure, if Figure 6 As shown, a reinforcing flange 22 a extending along the edge of the first through hole 22 is formed at the edge of the first through hole 22 in the rear frame 20 .

[0181] Therefore, the rigidity of the portion of the back frame 10 where the belt retractor 42 is assembled can be improved.

[0182] In the structure, if Figure 8 As shown, a substantially triangular reinforcing rib 31j bulging toward the rear of the seat is formed in a portion between the left and right column guides 38 in the front frame 30. Therefore, the assembly rigidity of the column guides 38 in the back frame 10 can be improved.

[0183] In addition, a rectangular opening 38a is formed on the front surface of the lower portion of the column guide 38. Therefore, the column guide 38 can be made lighter. In addition, a plurality of fixing portions 38b and fixing portions 38c (welded portions) of the column guide 38 are formed at intervals in the vertical direction on the front surface of the back frame 10. Thus, the rotation of the column guide 38 can be suppressed.

[0184] like Figure 1 to Figure 4 As shown, the seat belt device 40 includes: a seat belt 41 that restrains the upper body of the seated person; a belt retractor 42 that is installed on the backrest frame 10 and winds the seat belt 41 in a manner that allows the seat belt 41 to be withdrawn; and a belt guide 43 that is installed in the backrest frame 10 at a position higher than the belt retractor 42 and guides the seat belt 41 that is withdrawn from the belt retractor 42.

[0185] like Figure 1 As shown, the seat belt 41 is drawn out from the belt drawing hole located at the upper end portion of the belt retractor 42 and extends upward from the seat. The extended portion extending upward is guided toward the front of the seat along the outer peripheral surface of the upper end portion of the backrest frame 10. The extended portion extending toward the front of the seat abuts against the upper surface of the belt guide 43 and is guided toward the bottom of the seat along the belt guide 43.

[0186] A buckle ring 41 a is attached to the seat belt 41 , and the buckle ring 41 a is a structure that is connected to a belt buckle (not shown).

[0187] like Figure 3 to Figure 7As shown, the belt retractor 42 is provided inside the first through hole 22 and the second through hole 32 in the back frame 10 and is arranged at a position overlapping with the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10 .

[0188] The belt retractor 42 is assembled to the seatback frame 10 via a retractor bracket 50 .

[0189] The belt retractor 42 is a box-shaped module, comprising: a retractor body 42a; a rotating shaft 42b, which is supported on the retractor body 42a and serves as the rotation center of the seat belt 41; a mounting portion 42c (mounting hole), which is arranged at a position lower than the rotating shaft 42b and is mounted on the retractor bracket 50; and a positioning portion 42d, which is arranged between the rotating shaft 42b and the mounting portion 42c and is used to position the belt retractor 42.

[0190] In the structure, if Figure 7 As shown, the rear end portion 42 e of the belt retractor 42 is arranged at a position rearward of the rear frame 20 in the thickness direction of the back frame 10 (when the back frame 10 is viewed from the side).

[0191] Therefore, it is possible to suppress the belt retractor 42 from protruding forward from the back frame 10, and thus to provide a good sitting feeling.

[0192] In the structure, if Figure 7 As shown, the rotation shaft 42b of the belt retractor 42 is arranged at a position further rearward than the front frame 30 in the thickness direction of the back frame 10. In addition, the rotation shaft 42b of the belt retractor 42 is arranged at a position further forward than the rear frame 20 in the thickness direction of the back frame 10.

[0193] Therefore, the rotating shaft 42 b of the belt retractor 42 can be suitably protected in the thickness direction of the back frame 10 .

[0194] also, Figure 1 The belt guide 43 shown is disposed at the upper end portion of the back frame 10 , and is assembled to the back frame 10 via a belt guide bracket 60 .

[0195] The belt guide 43 , like the belt retractor 42 , is arranged at a position overlapping with the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10 .

[0196] like Figure 3 to Figure 7 As shown, the retractor bracket 50 is a bracket for assembling the belt retractor 42 to the back frame 10 , and is installed inside the first through hole 22 and the second through hole 32 .

[0197] Specifically, the retractor bracket 50 is mounted so as to bridge the outer edge portion of the second through hole 32 in the front frame 30 .

[0198] The retractor bracket 50 is disposed at a position overlapping with the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10 .

[0199] The retractor bracket 50 includes a main body wall 50a that is elongated in the vertical direction, a bottom wall 50b that extends forward from the lower end of the main body wall 50a, and left and right side walls 50c that extend forward from both ends of the main body wall 50a in the width direction.

[0200] The retractor bracket 50 includes a retractor mounting portion 51 (mounting hole) formed in the main body wall portion 50 a and used for assembling the belt retractor 42 , and a retractor positioning portion 52 (positioning hook).

[0201] In addition, the retractor bracket 50 has: a first frame mounting portion 53, which is formed at the extended end portion of the bottom wall portion 50b and is hooked and fixed to the front surface of the front frame 30; and a second frame mounting portion 54 and a third frame mounting portion 55, which are respectively formed at the extended end portions of the left and right side wall portions 50c and are hooked and fixed to the front surface of the front frame 30.

[0202] The retractor mounting portion 51 is connected to the belt retractor 42 by tightening the mounting bolt 56 in a state of being in contact with the belt retractor 42 (mounting portion 42 c ).

[0203] The retractor positioning portion 52 is hooked and fixed to the webbing retractor 42 (positioning portion 42 d ) to position the webbing retractor 42 .

[0204] Furthermore, the retractor mounting portion 51 and the retractor positioning portion 52 are formed on the front surface of the bulged portion 50d of the main body wall portion 50a, thereby improving the assembly rigidity.

[0205] The frame mounting portions 53 , 54 , and 55 are respectively mounted on the outer edge portions of the second through hole 32 in the front frame 30 .

[0206] Specifically, the frame mounting portions 53 , 54 , and 55 are overlapped with the outer edge portions of the second through-holes 32 and welded.

[0207] The third frame mounting portion 55 includes: a front wall portion 55a, overlapping with the front surface of the outer edge portion of the second through hole 32; an upper wall portion 55b, protruding rearward from the upper end portion of the front wall portion 55a and overlapping with the upper surface of the front frame 30; a side wall portion 55c, protruding rearward from the side end portion of the front wall portion 55a and overlapping with the side surface of the outer edge portion of the second through hole 32; and a reinforcing wall portion 55d, protruding laterally from the rear end portion of the side wall portion 55c and overlapping with the front surface of the front frame.

[0208] In the structure, if Figure 7 As shown, the retractor mounting portion 51 is disposed at a position further rearward than the front frame 30 in the thickness direction of the back frame 10 .

[0209] Therefore, the belt retractor 42 can be suitably protected from the seat front side.

[0210] In the structure, if Figure 5 As shown, a convex reinforcement portion 32 a is formed on a portion of the front surface of the front frame 30 where the frame mounting portions 53 , 54 , and 55 are mounted.

[0211] This can improve the rigidity of the portion of the back frame 10 to which the belt retractor 42 is assembled.

[0212] In addition, the reinforcement portion 32a may be a reinforcement convex portion or a reinforcement concave portion, or may be a reinforcement flange, a reinforcement rib, or the like.

[0213] like Figure 5 to Figure 7 As shown, the belt guide bracket 60 is a bracket for assembling the belt guide 43 to the back frame 10 , and is installed inside the first through hole 22 and the second through hole 32 .

[0214] Specifically, the belt guide bracket 60 is attached to the outer edge portion of the second through hole 32 in the front frame 30 .

[0215] A portion of the belt guide bracket 60 is disposed at a position overlapping with the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10 , and is disposed above the retractor bracket 50 .

[0216] The belt guide bracket 60 has: a front wall portion 60a, which is long in the seat width direction; an upper wall portion 60b, which extends forward from the upper end of the front wall portion 60a; a bottom wall portion 60c, which extends rearward from the lower end of the front wall portion 60a; and a rear wall portion 60d, which extends downward from the extended end of the bottom wall portion 60c.

[0217] The belt guide bracket 60 has a frame mounting portion 61 which is formed on the front wall portion 60 a and is welded to the front surface of the front frame 30 .

[0218] Furthermore, the belt guide holder 60 has a guide support portion 62 which is formed on the upper wall portion 60 b and supports the belt guide 43 from below.

[0219] like Figure 1 As shown, the support leg 70 is a substantially U-shaped pipe member that supports the seat cushion 2 .

[0220] The support leg 70 includes a leg main body portion 71 disposed at left and right positions in the seat width direction, and a leg connecting portion 72 connecting lower end portions of the leg main body portions 71 .

[0221] The upper end portion of the leg main body portion 71 is connected to the inside of the seat cushion 2. In addition, the center portion of the leg connecting portion 72 in the seat width direction is detachably held by a leg holding member 73 located on the vehicle body floor.

[0222] The upper end of the support leg 70 extends further forward of the seat than the lower end of the support leg 70 , and is inclined forward and upward from the lower end toward the upper end of the support leg 70 .

[0223] like Figure 1 to Figure 4 , Fig. 9 As shown, the switching device 80 is a device for switching the vehicle seat S from the “normal state” to the “storage state”, and is assembled to the side portion of the back frame 10 .

[0224] The switching device 80 includes: a vehicle body mounting bracket 81, which is installed on the upper part of the backrest frame 10; a locking member 82, which can be removably engaged with a striker that is part of the vehicle body and locks the rotational movement of the backrest frame 10; an operating rod 83, which is operated for the purpose of releasing the locked state of the backrest frame 10; and a connecting cable, which connects the locking member 82 and the operating rod 83.

[0225] In addition, if Fig. 9 As shown, the switching device 80 includes: a mounting bracket 84 installed at the lower end of the backrest frame 10; an intermediate bracket 85 installed at the mounting bracket 84 and protruding outward in the seat width direction; and a pivot bracket 86 installed at the intermediate bracket 85 and axially supporting the rotating shaft 87.

[0226] Furthermore, a coil spring for urging the back frame 10 toward the seat front side is assembled around the rotation shaft 87 .

[0227] The switching device 80 can release the locked state of the locking member 82 by operating the operating lever 83 when the seat body is in the “normal state”.

[0228] When the locked state is released, the seat back 1 is tilted forward by the biasing force of a coil spring (not shown) and folded together with the seat cushion 2 to switch to the “storage state” in which the seat back 1 is stored in the vehicle body floor.

[0229] Furthermore, along with the rotation of the seat back 1 , the support leg 70 can be rotated toward the seat cushion 2 and folded.

[0230] like Fig. 9As shown, the placement bracket 84 is assembled to the corner of the front surface of the back frame 10. The placement bracket 84 has a mounting portion 84a provided so as to protrude from the back frame 10 to the outside in the seat width direction and mounted to the intermediate bracket 85.

[0231] The intermediate bracket 85 is an L-shaped bracket in cross section, and has a bottom wall portion 85a overlapping the mounting portion 84a of the mounting bracket 84, and an outer wall portion 85b protruding forward from the outer end of the bottom wall portion 85a. The intermediate bracket 85 has an axis support portion 85c formed on the outer wall portion 85b and axially supporting the rotation axis 87.

[0232] The pivot bracket 86 is an L-shaped bracket in cross section, and has a bottom wall portion 86a overlapping the mounting portion 84a of the mounting bracket 84, and an outer wall portion 86b protruding forward from the outer end of the bottom wall portion 86a. The pivot bracket 86 has an axial support portion 86c formed on the outer wall portion 86b and axially supporting the rotation shaft 87.

[0233] In the structure, if Fig. 9 As shown, the placement bracket 84 (mounting portion 84a), the intermediate bracket 85 (bottom wall portion 85a), and the pivot bracket 86 (bottom wall portion 86a) are arranged at overlapping positions in the thickness direction of the seat back 1 and fastened together.

[0234] Therefore, the assembly rigidity of these brackets and the rotating shaft 87 can be improved.

[0235] In the structure, if Fig. 9 As shown in FIG. 1 , the mounting portion 84 a and the shaft support portion 85 c (shaft support portion 86 c ) are arranged at different positions in the seat front-rear direction, the seat width direction, and the up-down direction.

[0236] In this way, by separating the fixing points of the brackets from the rotation center of the rotation shaft 87 , the switching device 80 can be operated smoothly.

[0237] Through the above series of operations, the seat body is stored in the vehicle body floor, and the vehicle seat S is switched from the “normal state” to the “stored state”.

[0238] In addition, when the vehicle seat S is to be restored from the "storage state" to the "normal state", the occupant only needs to overcome the force applied by the coil spring (not shown) and lift the seat body by hand, so that the locking member 82 of the switching device 80 engages with the striker, thereby switching the backrest frame 10 to the locked state.

[0239] like Figure 1 to Figure 4As shown, the armrest locking device 90 is a device that connects the armrest 4 to the back frame 10 in a rotatable manner and locks the rotation of the armrest 4 , and is mounted on a side portion of the back frame 10 .

[0240] The armrest locking device 90 includes an armrest bracket 91 installed at a lower portion of the back frame 10 .

[0241] In addition, the armrest locking device 90 also includes: an armrest rotation axis, which is assembled on the armrest bracket 91 and becomes the rotation axis of the armrest 4; an armrest locking component, which locks the rotation movement of the armrest 4; an armrest operating rod, which is operated for the purpose of releasing the locked state of the armrest 4; and a connecting cable, which connects the armrest locking component and the armrest operating rod.

[0242] like Figure 2 As shown, the armrest bracket 91 is a bracket having an L-shaped cross section, and is assembled to the center portion and the corner portion of the front surface of the back frame 10 .

[0243] Specifically, the right armrest bracket 91 is mounted on the front surface of the backrest frame 10 , and the left armrest bracket 91 is mounted on the front surface of the mounting bracket 84 .

[0244] <Other embodiments>

[0245] In the above-described embodiment, the vehicle seat S is formed as a rear seat of the vehicle, but is not particularly limited thereto and may be a front seat of the vehicle or may be a middle seat in a vehicle having three rows of seats.

[0246] In the embodiment, the vehicle seat S is a seat capable of being arranged between a "normal state" and a "storage state (moving state)", but is not particularly limited thereto. For example, it may be a seat capable of being arranged in three states: a "normal state", a "storage state (moving state)", and a "flipped up state (moving state)" in which the seat body is flipped up upward.

[0247] In the embodiment described, Figure 2 As shown, the vehicle seat S is directly fixed to the vehicle floor, but the present invention is not particularly limited. The vehicle seat S may include a rail device that supports the seat body so as to be movable in the front-rear direction, and may be indirectly fixed to the vehicle floor via the rail device.

[0248] In the above-described embodiment, laser welding or arc welding is used when assembling the frames or assembling the frames and the brackets, but it is not particularly limited and various welding methods such as spot welding may be used. The structural parts may also be mounted by methods other than welding.

[0249] In the above embodiment, a storable vehicle seat used in an automobile is described as a specific example, but the invention is not limited thereto and can be used as a seat for transportation such as an airplane or a ship in addition to a seat for a vehicle such as a train or a bus.

[0250] In the present embodiment, the vehicle seat S of the present invention is mainly described.

[0251] The above-described embodiment is merely an example for making the present invention easy to understand and does not limit the present invention. Of course, the present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

Claims

1. A seat for a vehicle, comprising: The backrest frame becomes the skeleton of the seat back; as well as A belt retractor is mounted on the backrest frame and is used to wind up the seat belt. The vehicle seat is characterized by: The backrest frame includes a plate-shaped rear frame constituting the backrest frame and a front frame assembled to a front surface of the rear frame. The rear frame is provided with a first through hole penetrating in a thickness direction of the rear frame. The front frame is provided with a second through hole which is disposed at a position facing the first through hole and penetrates the front frame in a thickness direction. The front frame is assembled to the rear frame in a state where the first through hole and the second through hole are communicated with each other. The belt retractor is provided inside the first through hole and the second through hole in the back frame, and is arranged at a position overlapping with the rear frame and the front frame in a thickness direction of the back frame.

2. The vehicle seat according to claim 1, characterized in that: The rear end portion of the belt retractor is disposed at a position further rearward than the rear frame in the thickness direction of the back frame.

3. The vehicle seat according to claim 1, characterized in that: The first through hole and the second through hole are formed larger than the belt retractor in the vertical direction and the width direction of the back frame.

4. The vehicle seat according to claim 1, characterized in that: The belt retractor performs a rotational motion to wind up the seat belt, The rotating shaft of the belt retractor is arranged at a rearward position relative to the front frame in the thickness direction of the back frame.

5. The vehicle seat according to claim 1, characterized in that: The belt retractor performs a rotational motion to wind up the seat belt, The rotating shaft of the belt retractor is arranged at a frontward position relative to the rear frame in the thickness direction of the back frame.

6. The vehicle seat according to any one of claims 1 to 5, characterized in that: The backrest frame includes a retractor bracket for mounting the belt retractor, The retractor bracket is provided inside the first through hole and the second through hole, and is arranged at a position overlapping with the rear frame and the front frame in the thickness direction of the back frame.

7. The vehicle seat according to claim 6, characterized in that: The retractor bracket has a retractor mounting portion for mounting the belt retractor. The retractor mounting portion is disposed at a position further rearward than the front frame in a thickness direction of the back frame.

8. The vehicle seat according to claim 6, characterized in that: The retractor bracket has a frame mounting portion for mounting on a front surface of the front frame. A front reinforcing portion is formed in a portion of the front surface of the front frame where the frame mounting portion is mounted.

9. The vehicle seat according to claim 1, characterized in that: A rear reinforcement portion extending along the edge of the first through hole is formed at the edge of the first through hole in the rear frame.

10. The vehicle seat according to claim 1, characterized in that include: a switching device for switching the seat back between a normal state and a moved state in which the seat back is moved from the normal state, The switching device is provided at a side portion of the backrest frame and has a locking member for locking the movement of the seat back in the normal state. The locking member and the belt retractor are arranged at the same height position in the backrest frame.

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