Vehicle seat

Abstract

To provide a vehicle seat which can suppress discomfort of a seated person in a portion in which a belt retractor is assembled.SOLUTION: A vehicle seat includes: a back frame 10; and a belt retractor 42 attached to the back frame and used to wind a seat belt. The back frame 10 includes: a plate-like rear frame 20; and a front frame 30 assembled to a front surface of the rear frame. A first through hole 22 is formed at the rear frame 20. At the front frame 30, a second through hole 32 is formed at a position which faces the first through hole 22. The belt retractor 42 is provided in the first through hole 22 and the second through hole 32 of the back frame 10 and arranged in a position overlapping with the rear frame 20 and the front frame 30 in a thickness direction of the back frame.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat having a belt retractor attached to a seat back for winding a seat belt.

Background Art

[0002] Conventionally, a vehicle rear seat having a back frame serving as a skeleton of a seat back and a belt retractor attached to the front surface of the back frame for winding a seat belt is known (for example, Patent Document 1).

[0003] The vehicle seat described in Patent Document 1 includes a back frame and a belt retractor attached to the front surface of the back frame. The back frame includes a plate-shaped rear frame that forms its outer shape and a front frame assembled to the front surface of the rear frame. A through hole penetrating in the thickness direction of the front frame is formed in the front frame. The belt retractor is provided inside the through hole of the back frame and is disposed at a position overlapping the front frame in the thickness direction of the back frame.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in a vehicle seat having a belt retractor as in Patent Document 1, the belt retractor is assembled to the front surface of the back frame. Therefore, there is a possibility that a seated person may feel discomfort at a portion of the seat back where the belt retractor is assembled. That is, there is a possibility of affecting the sitting feeling of the seated person.

[0006] The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat with a better seating feeling than conventional ones. Another object of the present invention is to provide a vehicle seat equipped with a belt retractor, which can suppress the discomfort of the seated person at the part where the belt retractor is assembled.

Means for Solving the Problems

[0007] According to the vehicle seat of the present invention, the above problems are solved by a vehicle seat including a back frame serving as a skeleton of a seat back, and a belt retractor attached to the back frame for winding a seat belt, wherein the back frame includes a plate-shaped rear frame constituting the back frame, and a front frame assembled to the front surface of the rear frame, a first through hole penetrating in the thickness direction of the rear frame is formed in the rear frame, a second through hole penetrating in the thickness direction of the front frame is formed in the front frame at a position facing the first through hole, the front frame is assembled to the rear frame in a state where the first through hole and the second through hole communicate with each other, and 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 the rear frame and the front frame in the thickness direction of the back frame.

[0008] With the above configuration, in a vehicle seat equipped with a belt retractor, a vehicle seat with a better seating feeling than conventional ones can be realized. Specifically, the belt retractor is provided inside the first through hole and the second through hole of the back frame, and is disposed at a position overlapping the rear frame and the front frame in the thickness direction of the back frame. That is, it is possible to suppress the belt retractor from protruding forward from the back frame, and the discomfort of the seated person can be suppressed at the part of the seat back where the belt retractor is assembled. More specifically, generally, a vehicle seat is mainly composed of a seat frame, a padding material, and a skin material. By minimizing the protrusion of the belt retractor forward from the back frame, the thickness of the padding material can be ensured. Therefore, the seating feeling can be improved.

[0009] At this time, the rear end portion of the belt retractor is preferably disposed at a position rearward of the rear frame in the thickness direction of the back frame. With the above configuration, it is possible to further suppress the belt retractor from protruding forward from the back frame, and the seating feeling can be further improved.

[0010] At this time, the first through hole and the second through hole are preferably formed larger than the belt retractor in the vertical direction and the width direction of the back frame. With the above configuration, the assembly work of the belt retractor can be facilitated.

[0011] At this time, the belt retractor rotates to wind up the seat belt. The rotation axis of the belt retractor is preferably disposed at a position rearward of the front frame in the thickness direction of the back frame. Also, the belt retractor rotates to wind up the seat belt, and the rotation axis of the belt retractor is preferably disposed at a position forward of the rear frame in the thickness direction of the back frame. With the above configuration, the rotation axis of the belt retractor can be suitably protected in the thickness direction of the back frame.

[0012] At this time, the back frame includes a retractor bracket for attaching the belt retractor, and the retractor bracket is provided inside the first through hole and the second through hole, and is arranged at a position overlapping the rear frame and the front frame in the thickness direction of the back frame. By providing the retractor bracket as described above, the belt retractor can be suitably assembled to the back frame. Further, it is possible to suppress the belt retractor from protruding forward from the back frame.

[0013] At this time, the retractor bracket has a retractor attachment portion for attaching the belt retractor, and the retractor attachment portion is preferably arranged at a position rearward of the front frame in the thickness direction of the back frame. With the above configuration, the belt retractor can be suitably protected from the front side of the seat.

[0014] At this time, the retractor bracket has a frame attachment portion for attaching to the front surface of the front frame, and a reinforcing portion is preferably formed at a portion of the front surface of the front frame where the frame attachment portion is attached. Further, in the rear frame, a reinforcing portion extending along the edge of the first through hole is preferably formed at the edge of the first through hole. With the above configuration, the rigidity of the portion of the back frame where the belt retractor is assembled can be improved.

[0015] At this time, a switching device for switching between the normal state of the seat back and a moving state moved from the normal state is provided, the switching device is provided at a side portion of the back frame, and has a locking member for locking the moving operation of the seat back in the normal state, and the locking member and the belt retractor are preferably arranged at the same height position in the back frame. With the above configuration, it is possible to improve the rigidity of the portion of the back frame where the belt retractor is assembled. That is, even when an external load is applied to the seat back (back frame), by arranging the belt retractor at a position relatively close to the locking member, the assembling rigidity of the belt retractor can be suitably ensured.

Advantages of the Invention

[0016] According to the present invention, it is possible to realize a vehicle seat with a better seating feeling than before. Further, in a vehicle seat provided with a belt retractor, even at the portion where the belt retractor is assembled, it is possible to suppress the discomfort of the seated person. Also according to the present invention, it is possible to suppress the belt retractor from protruding forward from the back frame, and the seating feeling can be improved. Also according to the present invention, the assembling work of the belt retractor can be facilitated. Also according to the present invention, the rotation axis of the belt retractor can be suitably protected in the thickness direction of the back frame. Also according to the present invention, by providing a retractor bracket, the belt retractor can be suitably assembled to the back frame. Also according to the present invention, the belt retractor can be suitably protected from the front side of the seat. Also according to the present invention, it is possible to improve the rigidity of the portion of the back frame where the belt retractor is assembled.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 9. This embodiment relates to a vehicle seat including a back frame and a belt retractor assembled to the back frame for winding up a seat belt, and is capable of suppressing a sense of discomfort of a seated person at a portion where the belt retractor is assembled. Note that the side where the seated person sits with respect to the seat back of the vehicle seat is the "front side". Also, the traveling direction of the vehicle is the "front-rear direction", and the left-right direction when the vehicle faces the traveling direction is the "left-right direction" of the vehicle seat.

[0019] As shown in FIG. 1, 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 provided side by side in the seat width direction. The vehicle seat S is a seat capable of two types of seat arrangements: a "normal state" in which an occupant can sit and a "stored state (moving state)" in which the seat body is stored in a storage floor. Specifically, when the occupant operates the operation lever 83 shown in FIG. 1 from the "normal state", the seat body of the vehicle seat S tilts forward and is folded, and switches to the "stored state" where it is stored on the vehicle floor. Further, from the "stored state", the occupant manually raises the seat body upward to return to the "normal state".

[0020] As shown in FIGS. 1 and 2, 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 respectively attached inside the seat back 1 for restraining the upper body of the seated person, a retractor bracket 50 for assembling the belt retractor 42 of the seat belt device 40, and a belt guide bracket 60 for guiding the seat belt 41 extending from the belt retractor 42. In addition, the vehicle seat S includes a support leg 70 attached between the seat cushion 2 and the vehicle floor for supporting the seat body, a switching device 80 attached to a side portion of the seat back 1 for switching the seat body from the "normal state" to the "stored state", and an arm lock device 90 for rotatably connecting the armrest 4 to the seat back 1.

[0021] As shown in FIGS. 1 and 2, the seat back 1 is a backrest portion that supports the occupant's back from behind, and includes a back frame 10 serving as a skeleton, a pad material 1a placed on the back frame 10, and a skin material 1b covering the back frame 10 and the pad material 1a. The seat cushion 2 is a seating portion that supports the occupant from below, and includes a cushion frame serving as a skeleton, a pad material 2a placed on the cushion frame, and a skin material 2b covering the cushion frame and the pad material 2a. The headrest 3 is a head portion that supports the occupant's head from behind, and includes a headrest pillar serving as a core material, a pad material 3a placed on the headrest pillar, and a skin material 3b covering the cushion frame and the pad material 3a. The armrest 4 is a member that supports the arm of the seated person from below and is also referred to as the center armrest.

[0022] As shown in FIGS. 2 to 4, the back frame 10 is composed of a substantially rectangular frame body that forms the skeleton of the seat back 1, and includes a plate-shaped rear frame 20 that constitutes the outer shape of the back frame 10, and a plate-shaped front frame 30 that is assembled to the front surface of the rear frame 20. 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. For example, the rear frame 20 and the front frame 30 can be integrally assembled by welding them in a facing state (by laser welding from the front or rear of the seat).

[0023] As shown in FIGS. 2 to 4, the rear frame 20 is a plate-shaped panel frame, and includes a rectangular frame body 21, a first through hole 22 for assembling the belt retractor 42, a vehicle body attachment portion 23 for assembling the switching device 80 (vehicle body attachment bracket 81), a pillar attachment portion 24 for assembling the pillar guide 38, an anchor attachment portion 25 for assembling the child seat anchor 39, a shaft attachment portion 26 for assembling the switching device 80 (set bracket 84), and an arm attachment portion 27 for assembling the armrest 4 (arm bracket 91).

[0024] 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. Specifically, an upper flange 21a, a lower flange 21b, a right end flange 21c, and a left end flange 21d are formed on the outer edge of the frame body 21. Further, front bulging portions 21e and 21f that bulge forward are formed on the left and right side portions and the lower portion of the frame body 21, respectively. Further, front bulging portions 21g and 21h that bulge forward are formed on the diagonal lines of the frame body 21. Therefore, the rigidity of the rear frame 20 can be increased. Note that a plurality of openings are formed at intervals in the vertical and horizontal directions on the front surface of the frame body 21. Therefore, the rear frame 20 can be lightened.

[0025] The first through hole 22 is a substantially rectangular through hole that penetrates in the thickness direction of the rear frame 20, and is formed in the upper portion of the rear frame 20. The first through hole 22, the left and right vehicle body attachment portions 23, and the left and right pillar attachment portions 24 are arranged at positions (the same height position) that overlap in the vertical direction. Further, the left and right shaft attachment portions 26 and the arm attachment portions 27 are arranged at positions (the same height position) that overlap in the vertical direction.

[0026] As shown in FIGS. 2 to 4, the front frame 30 is a plate-shaped panel frame, and includes a rectangular frame body 31, a second through hole 32 for assembling the belt retractor 42, a vehicle body attachment portion 33 for assembling the switching device 80 (vehicle body attachment bracket 81), a pillar attachment portion 34 for assembling the pillar guide 38, an anchor attachment portion 35 (anchor attachment hole) for assembling the child seat anchor 39, a shaft attachment portion 36 for assembling the switching device 80 (set bracket 84), and an arm attachment portion 37 for assembling the armrest 4 (arm bracket 91).

[0027] The frame body 31 has an uneven structure in which a part of the frame body 31 bulges forward and backward. Further, a flange is formed on the outer edge of the frame body 31. Specifically, an upper end flange 31a, a lower end flange 31b, a right end flange 31c, and a left end flange 31d are formed on the outer edge of the frame body 31. Further, front bulging portions 31e and 31f that bulge forward are formed on the left and right side portions and the lower end portion of the frame body 31, respectively. Further, rear bulging portions 31g and 31h that bulge backward are formed on the diagonal lines of the frame body 31, respectively. Further, a rear bulging portion 31i is also formed in the central portion of the frame body 31. Therefore, the rigidity of the front frame 30 can be increased. Further, by abutting and welding the rear bulging portion of the front frame 30 and the front bulging portion of the rear frame 20, the rigidity of the back frame 10 can be further increased.

[0028] The front frame 30 is assembled so as to be bonded to the rear frame 20 in a state where the first through hole 22 and the second through hole 32 communicate with each other. The second through hole 32 is a substantially rectangular through hole that penetrates in the thickness direction of the front frame 30, 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. The second through hole 32, the left and right vehicle body attachment portions 33, and the left and right pillar attachment portions 34 are disposed at positions (the same height position) that overlap in the vertical direction. Further, the left and right shaft attachment portions 36 and the arm attachment portions 37 are disposed at positions (the same height position) that overlap in the vertical direction.

[0029] In the above configuration, as shown in FIGS. 3 and 4, 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. Therefore, the assembly work of the belt retractor 42 can be facilitated.

[0030] In the above configuration, as shown in FIG. 6, in the rear frame 20, a reinforcing flange 22a that extends along the edge of the first through hole 22 is formed at the edge of the first through hole 22. Therefore, the rigidity of the portion of the back frame 10 where the belt retractor 42 is assembled can be increased.

[0031] In the above configuration, as shown in FIG. 8, in the front frame 30, a substantially triangular reinforcing bead 31j bulging rearward of the seat is formed in the portion between the left and right pillar guides 38. Therefore, the assembly rigidity of the pillar guide 38 in the back frame 10 can be increased. Note that a rectangular opening 38a is formed in the front surface of the lower portion of the pillar guide 38. Therefore, the pillar guide 38 can be lightened. Further, a plurality of fixing portions 38c, 38d (welding portions) of the pillar guide 38 are formed at intervals in the vertical direction with respect to the front surface of the back frame 10. By doing so, the rotation of the pillar guide 38 can be suppressed.

[0032] As shown in FIGS. 1 to 4, 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 attached to the back frame 10 and winds up the seat belt 41 in a retractable manner, and a belt guide 43 that is attached to the back frame 10 at a position above the belt retractor 42 and guides the seat belt 41 pulled out from the belt retractor 42.

[0033] As shown in FIG. 1, the seat belt 41 is pulled out from a belt pull-out hole at the upper end portion of the belt retractor 42 and extends upward of the seat. The extended portion extending upward is guided forward of the seat along the outer peripheral surface of the upper end portion of the back frame 10. The extended portion extending forward of the seat abuts on the upper surface of the belt guide 43 and is guided downward of the seat along the belt guide 43. A belt tongue plate 41a is attached to the seat belt 41, and the belt tongue plate 41a is configured to be connected to a belt buckle (not shown).

[0034] As shown in FIGS. 3 to 7, the belt retractor 42 is provided inside the first through hole 22 and the second through hole 32 of the back frame 10, and is disposed at a position overlapping the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10. The belt retractor 42 is assembled to the back frame 10 via a retractor bracket 50.

[0035] The belt retractor 42 is a box-shaped module, and includes a retractor main body 42a, a rotary shaft 42b pivotally supported by the retractor main body 42a and serving as the rotation center of the seat belt 41, an attachment portion 42c (attachment hole) disposed below the rotary shaft 42b and attached to the retractor bracket 50, and a positioning portion 42d disposed between the rotary shaft 42b and the attachment portion 42c for positioning the belt retractor 42.

[0036] In the above configuration, as shown in FIG. 7, the rear end portion 42e of the belt retractor 42 is disposed at a position rearward of the rear frame 20 in the thickness direction of the back frame 10 (in a side view of the back frame 10). Therefore, it is possible to prevent the belt retractor 42 from protruding forward from the back frame 10, and the seating feeling can be improved.

[0037] In the above configuration, as shown in FIG. 7, the rotary shaft 42b of the belt retractor 42 is disposed at a position rearward of the front frame 30 in the thickness direction of the back frame 10. Further, the rotary shaft 42b of the belt retractor 42 is disposed at a position forward of the rear frame 20 in the thickness direction of the back frame 10. Therefore, the rotary shaft 42b of the belt retractor 42 can be suitably protected in the thickness direction of the back frame 10.

[0038] Note that the belt guide 43 shown in FIG. 1 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. The belt guide 43 is arranged at a position overlapping the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10, similarly to the belt retractor 42.

[0039] The retractor bracket 50 is a bracket for assembling the belt retractor 42 to the back frame 10, as shown in FIGS. 3 to 7, and is attached inside the first through hole 22 and the second through hole 32. Specifically, the retractor bracket 50 is attached so as to span the outer edge of the second through hole 32 in the front frame 30. The retractor bracket 50 is arranged at a position overlapping the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10.

[0040] The retractor bracket 50 has a vertically long main body wall portion 50a, a bottom wall portion 50b extending forward from the lower end portion of the main body wall portion 50a, and left and right side wall portions 50c extending forward from both end portions in the width direction of the main body wall portion 50a. The retractor bracket 50 has a retractor attachment portion 51 (attachment hole) formed in the main body wall portion 50a for assembling the belt retractor 42, and a retractor positioning portion 52 (positioning hook). Further, the retractor bracket 50 has a first frame attachment portion 53 formed at the extending end portion of the bottom wall portion 50b and hooked on the front surface of the front frame 30, and a second frame attachment portion 54 and a third frame attachment portion 55 respectively formed at the extending end portions of the left and right side wall portions 50c and hooked on the front surface of the front frame 30.

[0041] The retractor attachment portion 51 is connected to the belt retractor 42 by fastening the attachment bolt 56 in a state of abutting against the belt retractor 42 (attachment portion 42c). The retractor positioning portion 52 positions the belt retractor 42 by being hooked on the belt retractor 42 (positioning portion 42d). Note that the retractor attachment portion 51 and the retractor positioning portion 52 are formed on the front surface of the bulging portion 50d that bulges out of the main body wall portion 50a. Therefore, the assembly rigidity can be enhanced.

[0042] The frame attachment portions 53, 54, and 55 are respectively spanned across the outer edge portions of the second through holes 32 in the front frame 30. Specifically, the frame attachment portions 53, 54, and 55 and the outer edge portions of the second through holes 32 are overlapped and welded. The third frame attachment portion 55 has a front wall portion 55a that overlaps the front surface of the outer edge portion of the second through hole 32, an upper wall portion 55b that protrudes rearward from the upper end portion of the front wall portion 55a and overlaps the upper surface of the front frame 30, a side wall portion 55c that protrudes rearward from the side end portion of the front wall portion 55a and overlaps the side surface of the outer edge portion of the second through hole 32, and a reinforcing wall portion 55d that protrudes laterally from the rear end portion of the side wall portion 55c and overlaps the front surface of the front frame.

[0043] In the above configuration, as shown in FIG. 7, the retractor attachment portion 51 is disposed at a position rearward of the front frame 30 in the thickness direction of the back frame 10. Therefore, the belt retractor 42 can be suitably protected from the front side of the seat.

[0044] In the above configuration, as shown in FIG. 5, convex reinforcing portions 32a are formed on the portions of the front surface of the front frame 30 where the frame attachment portions 53, 54, and 55 are attached. By doing so, the rigidity of the portion of the back frame 10 where the belt retractor 42 is assembled can be improved. Note that the reinforcing portion 32a may be a reinforcing convex portion, a reinforcing concave portion, a reinforcing flange, a reinforcing bead, or the like.

[0045] As shown in FIGS. 5 to 7, the belt guide bracket 60 is a bracket for assembling the belt guide 43 to the back frame 10, and is attached inside the first through hole 22 and the second through hole 32. Specifically, the belt guide bracket 60 is attached to the outer edge of the second through hole 32 in the front frame 30. A part of the belt guide bracket 60 is disposed at a position overlapping 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.

[0046] The belt guide bracket 60 has a front wall portion 60a that is long in the seat width direction, an upper wall portion 60b that extends forward from the upper end portion of the front wall portion 60a, a bottom wall portion 60c that extends rearward from the lower end portion of the front wall portion 60a, and a rear wall portion 60d that extends downward from the extending end portion of the bottom wall portion 60c. The belt guide bracket 60 has a frame attachment portion 61 formed on the front wall portion 60a and welded to the front surface of the front frame 30. The belt guide bracket 60 also has a guide support portion 62 formed on the upper wall portion 60b for supporting the belt guide 43 from below.

[0047] As shown in FIG. 1, the support leg 70 is a substantially U-shaped pipe member that supports the seat cushion 2. The support leg 70 includes leg body portions 71 disposed at left and right positions in the seat width direction, and a leg connecting portion 72 that connects the lower end portions of the respective leg body portions 71. The upper end portion of the leg body portion 71 is connected to the inside of the seat cushion 2. Also, the central portion in the seat width direction of the leg connecting portion 72 is detachably held by a leg holding member 73 on the vehicle body floor. The upper end portion of the support leg 70 protrudes forward of the seat more than the lower end portion of the support leg 70, and slopes upward and forward from the lower end portion to the upper end portion of the support leg 70.

[0048] As shown in FIGS. 1 to 4 and FIG. 9, the switching device 80 is a device for switching the vehicle seat S from the "normal state" to the "stored state", and is assembled to the side portion of the back frame 10. The switching device 80 includes a vehicle body mounting bracket 81 attached to the upper part of the back frame 10, a lock member 82 that detachably engages with a striker that is part of the vehicle body and locks the rotational movement of the back frame 10, an operation lever 83 that is operated to release the locked state of the back frame 10, and a connecting cable that connects the lock member 82 and the operation lever 83. Also, as shown in FIG. 9, the switching device 80 includes a set bracket 84 attached to the lower end of the back frame 10, an intermediate bracket 85 attached to the set bracket 84 and protruding outward in the seat width direction, and a pivot bracket 86 attached to the intermediate bracket 85 and supporting a rotation shaft 87. Around the rotation shaft 87, a spiral spring that biases the back frame 10 toward the front side of the seat is assembled.

[0049] When the seat body is in the "normal state", the locked state of the lock member 82 can be released by operating the operation lever 83 of the switching device 80. When the locked state is released, the seat back 1 falls forward by the biasing force of a spiral spring (not shown), folds together with the seat cushion 2, and switches to the "stored state" where it is stored in the vehicle body floor. Note that along with the rotational movement of the seat back 1, the support leg 70 can be rotated and folded toward the seat cushion 2 side.

[0050] As shown in FIG. 9, the set bracket 84 is assembled to the corner of the front surface of the back frame 10. The set bracket 84 is provided so as to protrude outward in the seat width direction from the back frame 10 and has an attachment portion 84a for attaching to the intermediate bracket 85. The intermediate bracket 85 is a bracket having an L-shaped cross section, and has a bottom wall portion 85a that overlaps the attachment portion 84a of the set bracket 84, and an outer wall portion 85b that protrudes forward from the outer end of the bottom wall portion 85a. The intermediate bracket 85 has a shaft support portion 85c formed on the outer wall portion 85b for supporting the rotation shaft 87. The pivot bracket 86 is a bracket having an L-shaped cross section, and includes a bottom wall portion 86a that overlaps with the attachment portion 84a of the set bracket 84, and an outer wall portion 86b that protrudes forward from the outer end portion of the bottom wall portion 86a. The pivot bracket 86 has a shaft support portion 86c that is formed on the outer wall portion 86b and supports the rotation shaft 87.

[0051] In the above configuration, as shown in FIG. 9, the set bracket 84 (attachment portion 84a), the intermediate bracket 85 (bottom wall portion 85a), and the pivot bracket 86 (bottom wall portion 86a) are arranged at positions overlapping in the thickness direction of the seat back 1 and are clamped together. Therefore, the assembly rigidity of these brackets and the rotation shaft 87 can be increased.

[0052] In the above configuration, as shown in FIG. 9, the attachment portion 84a and the shaft support portion 85c (shaft support portion 86c) are arranged at different positions in the front-rear direction of the seat, the seat width direction, and the vertical direction. By separating the fixing points between the brackets and the rotation center of the rotation shaft 87 in this way, the switching device 80 can operate smoothly.

[0053] By 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". When it is desired to return the vehicle seat S from the "stored state" to the "normal state", the occupant can lift the seat body by hand against the biasing force of a torsion spring (not shown), engage the lock member 82 of the switching device 80 with the striker, and switch the back frame 10 to the locked state.

[0054] As shown in FIGS. 1 to 4, the arm lock device 90 is a device that rotatably connects the armrest 4 to the back frame 10 and locks the rotational movement of the armrest 4, and is attached to a side portion of the back frame 10. The arm lock device 90 includes an arm bracket 91 attached to a lower portion of the back frame 10. Note that the arm lock device 90 is assembled to the arm bracket 91, and includes an arm rotation axis that serves as the rotation axis of the armrest 4, an arm lock member that locks the rotation operation of the armrest 4, an arm operation lever that is operated to release the locked state of the armrest 4, and a connection cable that connects the arm lock member and the arm operation lever.

[0055] As shown in FIG. 2, the arm bracket 91 is a bracket having an L-shaped cross section, and is assembled to the central portion and the corner portion of the front surface of the back frame 10, respectively. Specifically, the right arm bracket 91 is attached to the front surface of the back frame 10, and the left arm bracket 91 is attached to the front surface of the set bracket 84.

[0056] <Other Embodiments> In the above embodiment, the vehicle seat S is formed as a rear seat of a vehicle, but is not particularly limited, and may be a front seat of a vehicle or a middle seat in a vehicle having a three-row seat.

[0057] In the above embodiment, the vehicle seat S is a seat whose seat arrangement can be changed between a "normal state" and a "stored state (moving state)", but is not particularly limited. For example, it may be a seat that can be arranged in three forms: a "normal state", a "stored state (moving state)", and a "tip-up state (moving state)" in which the seat body is bounced upward.

[0058] In the above embodiment, as shown in FIG. 2, the vehicle seat S is directly fixed to the vehicle body floor, but 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 on the vehicle body floor via the rail device.

[0059] In the above embodiment, laser welding or arc welding is employed when assembling the frames or when assembling the frame and the bracket. However, it is not particularly limited, and various welding methods such as spot welding may be employed. The components may be attached by methods other than welding.

[0060] In the above embodiment, as a specific example, a retractable vehicle seat used in an automobile has been described. However, it is not limited thereto, and in addition to vehicle seats for trains, buses, etc., it can also be used as a seat for vehicles such as airplanes and ships.

[0061] In this embodiment, the vehicle seat S according to the present invention has been mainly described. However, the above embodiment is merely an example for facilitating the understanding of the present invention and does not limit the present invention. The present invention can be changed and improved without departing from its gist, and it goes without saying that equivalents of the present invention are included therein.

Explanation of Reference Numerals

[0062] S Vehicle seat 1 Seat back 1a, 2a, 3a Pad material 1b, 2b, 3b Skin material 2 Seat cushion 3 Headrest 4 Armrest 10 Back frame 20 Rear frame 21 Frame body 21a Upper flange 21b Lower flange 21c Right end flange 21d Left end flange 21e, 21f, 21g, 21h Front bulging part 22 First through hole 22a Reinforcing flange 23 Vehicle body attachment part 24 Pillar attachment part 25 Anchor attachment part 26 - axis mounting part 27 - arm mounting part 30 - front frame 31 - frame body 31a - upper flange 31b - lower flange 31c - right - hand branch 31d - left - hand flange 31e, 31f - front bulging part 31g, 31h, 31i - rear bulging part 31j - reinforcing bead 32 - second through - hole 32a - reinforcing part 33 - vehicle body mounting part 34 - pillar mounting part 35 - anchor mounting part (anchor mounting hole) 36 - axis mounting part 37 - arm mounting part 38 - pillar guide 38a - opening 38b, 38c - fixing part 39 - child - seat anchor 40 - seat - belt device 41 - seat - belt 41a - tongue plate 42 - belt retractor 42a - retractor body 42b - rotating shaft 42c - mounting part (mounting hole) 42d - positioning part 42e - rear end part 43 - belt guide 50 - retractor bracket 50a - main body wall part 50b - bottom wall part 50c - side wall part 50d - bulging part 51 - retractor mounting part (mounting hole) 52 - retractor positioning part (positioning hook) 53 - first frame mounting part 54 - second frame mounting part 55 Third Frame Mounting Port 55a Front Wall Port 55b Upper Wall Port 55c Side Wall Port 55d Reinforcing Wall Port 56 Mounting Bolt 60 Belt Guide Bracket 60a Front Wall Port 60b Upper Wall Port 60c Bottom Wall Port 60d Rear Wall Port 61 Frame Mounting Port 62 Guide Support Port 70 Support Leg 71 Leg Body Port 72 Leg Connecting Port 73 Leg Holding Member 80 Switching Device 81 Vehicle Body Mounting Bracket 82 Locking Member 83 Operating Lever 84 Set Bracket 84a Mounting Port 85 Intermediate Bracket 85a Bottom Wall Port 85b Outer Wall Port 85c Shaft Support Port 86 Pivot Bracket 86a Bottom Wall Port 86b Outer Wall Port 86c Shaft Support Port 87 Rotating Shaft 90 Arm Locking Device 91 Arm Bracket

Claims

1. A vehicle seat comprising a back frame serving as a skeleton of a seat back, and a belt retractor attached to the back frame for winding up a seat belt, wherein the back frame includes a plate-shaped rear frame constituting the back frame and a front frame assembled to the front surface of the rear frame, a first through hole penetrating in the thickness direction of the rear frame is formed in the rear frame, a second through hole penetrating in the thickness direction of the front frame is formed in the front frame at a position facing the first through hole, the front frame is assembled to the rear frame in a state where the first through hole and the second through hole communicate with each other, the belt retractor is provided inside the first through hole and the second through hole in the back frame, and is disposed at a position overlapping the rear frame and the front frame in the thickness direction of the back frame. A vehicle seat characterized by that.

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

3. The vehicle seat according to claim 1, wherein 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 belt retractor rotates to wind up the seat belt, The vehicle seat according to claim 1, wherein a rotation axis of the belt retractor is disposed at a position rearward of the front frame in the thickness direction of the back frame.

5. The belt retractor rotates to wind up the seat belt, The vehicle seat according to claim 1, wherein a rotation axis of the belt retractor is disposed at a position forward of the rear frame in the thickness direction of the back frame.

6. The back frame includes a retractor bracket for attaching 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 the rear frame and the front frame in the thickness direction of the back frame. The vehicle seat according to any one of claims 1 to 5, characterized in that.

7. The retractor bracket has a retractor attachment portion for attaching the belt retractor. The vehicle seat according to claim 6, characterized in that the retractor attachment portion is arranged at a position rearward of the front frame in the thickness direction of the back frame.

8. The retractor bracket has a frame attachment portion for attaching to the front surface of the front frame. The vehicle seat according to claim 6, characterized in that a reinforcing portion is formed at a portion of the front surface of the front frame where the frame attachment portion is attached.

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

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

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