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 that is attached to a seat back and has a belt retractor for winding up a seat belt. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a vehicle rear seat is known that includes a back frame that serves as the framework of the seat back, and a belt retractor that is attached to the front surface of the back frame and that winds up a seat belt (see, 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 defines the outer shape of the back frame, and a front frame that is attached to the front surface of the rear frame. A through hole is formed in the front frame that passes through the thickness of the front frame. The belt retractor is provided inside the through hole of the back frame and is disposed at a position that overlaps the front frame in the thickness direction of the back frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-162225 A Summary of the Invention [Problem to be solved by the invention]

[0005] In a vehicle seat equipped with a belt retractor as disclosed in Patent Document 1, the belt retractor is attached to the front surface of the back frame. Therefore, the seat occupant may feel uncomfortable at the part of the seat back where the belt retractor is attached. In other words, the seating feeling of the seat occupant may be affected.

[0006] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a vehicle seat that provides a better seating feeling than conventional seats. Another object of the present invention is to provide a vehicle seat equipped with a belt retractor, which is capable of suppressing discomfort felt by a seat occupant at the location where the belt retractor is attached. [Means for solving the problem]

[0007] The above problem is solved by a vehicle seat of the present invention, which provides a vehicle seat including a back frame that forms the skeleton of a seat back, and a belt retractor that is attached to the back frame and winds up a seat belt, wherein the back frame includes a plate-shaped rear frame that constitutes the back frame, and a front frame that is assembled to a front surface of the rear frame, the rear frame having a first through hole that penetrates in a thickness direction of the rear frame, and the front frame having a second through hole that is provided in a position opposite to the first through hole and penetrates in a thickness direction of the front frame, the front frame being assembled to the rear frame with the first through hole and the second through hole communicating with each other, and the belt retractor is provided inside the first through hole and the second through hole of the back frame, and is positioned at a position that overlaps the rear frame and the front frame in the thickness direction of the back frame.

[0008] With the above-described configuration, it is possible to realize a vehicle seat equipped with a belt retractor that provides a better seating feeling than conventional vehicle seats. More specifically, the belt retractor is provided inside the first and second through holes 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. In other words, the belt retractor can be prevented from protruding forward from the back frame, and discomfort felt by the seat occupant can be reduced in the portion of the seat back where the belt retractor is attached. More specifically, since vehicle seats are generally mainly composed of a seat frame, a padding material, and a cover material, by minimizing the protrusion of the belt retractor forward from the back frame, the thickness of the padding material can be secured, thereby improving the seating feeling.

[0009] In this case, it is preferable that a rear end portion of the belt retractor is disposed rearward of the rear frame in a thickness direction of the back frame. With the above-described configuration, the belt retractor can be further prevented from projecting forward from the back frame, thereby improving the seating feeling.

[0010] In this case, it is preferable that the first through hole and the second through hole are formed larger than the belt retractor in the vertical direction and width direction of the back frame. With the above-described configuration, the assembly work of the belt retractor can be facilitated.

[0011] At this time, the belt retractor rotates to retract the seat belt, The rotation shaft of the belt retractor may be disposed rearward of the front frame in the thickness direction of the back frame. In addition, it is preferable that the belt retractor rotates to retract the seat belt, and a rotation shaft of the belt retractor is disposed at a position forward of the rear frame in a thickness direction of the back frame. With the above-described configuration, the rotation shaft of the belt retractor can be suitably protected in the thickness direction of the back frame.

[0012] In this case, the back frame is provided with a retractor bracket for mounting the belt retractor, and the retractor bracket is preferably provided inside the first through hole and the second through hole, and is positioned in 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 attached to the back frame, and the belt retractor can be prevented from protruding forward from the back frame.

[0013] In this case, it is preferable that the retractor bracket has a retractor mounting portion for mounting the belt retractor, and that the retractor mounting portion is disposed at a position rearward of the front frame in the thickness direction of the back frame. With the above-described configuration, the belt retractor can be suitably protected from the front side of the seat.

[0014] In this case, it is preferable that the retractor bracket has a frame mounting portion for mounting to the front surface of the front frame, and that a reinforcing portion is formed in the portion of the front surface of the front frame to which the frame mounting portion is attached. Also, it is preferable that a reinforcing portion is formed on an edge of the first through hole in the rear frame, the reinforcing portion extending along the edge of the first through hole. With the above-described configuration, the rigidity of the portion of the back frame to which the belt retractor is attached can be improved.

[0015] In this case, a switching device is provided for switching the seat back between a normal state and a moving state in which the seat back is moved from the normal state, the switching device is provided on a side portion of the back frame, and has a locking member for locking the movement of the seat back in the normal state, and the locking member and the belt retractor are preferably arranged at the same height position on the back frame. With the above-mentioned configuration, the rigidity of the portion of the back frame to which the belt retractor is attached can be improved. That is, even if an external load is applied to the seat back (back frame), the belt retractor can be disposed at a position relatively close to the locking member, so that the assembly rigidity of the belt retractor can be suitably secured. Effect of the Invention

[0016] According to the present invention, a vehicle seat that provides a better seating feeling than in the past can be realized. In addition, in a vehicle seat equipped with a belt retractor, discomfort felt by a seat occupant can be suppressed even in the area where the belt retractor is attached. Furthermore, according to the present invention, the belt retractor can be prevented from projecting forward from the back frame, improving seating comfort. Furthermore, according to the present invention, the assembly work of the belt retractor can be facilitated. Furthermore, according to the present invention, the rotation shaft of the belt retractor can be suitably protected in the thickness direction of the back frame. Furthermore, according to the present invention, by providing the retractor bracket, the belt retractor can be suitably assembled to the back frame. Furthermore, according to the present invention, the belt retractor can be suitably protected from the front side of the seat. Furthermore, according to the present invention, the rigidity of the portion of the back frame to which the belt retractor is attached can be improved. [Brief description of the drawings]

[0017] [Figure 1] 1 is a perspective view of a vehicle seat according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a perspective view of a back frame, a belt retractor, and a retractor bracket. [Diagram 3] FIG. 2 is an exploded perspective view of a back frame, a belt retractor, and a retractor bracket. [Figure 4]4 is an exploded perspective view of a back frame, a belt retractor, and a retractor bracket as viewed from behind the seat. FIG. [Diagram 5] 3 is an enlarged view of a main portion of FIG. 2, showing a retractor bracket and a belt guide bracket. FIG. [Figure 6] 4 is a perspective view (enlarged view of essential parts) of a back frame, a belt retractor, and a retractor bracket as viewed from behind the seat. FIG. [Figure 7] FIG. 4 is a side cross-sectional view of the back frame, the belt retractor, and the retractor bracket. [Figure 8] FIG. 3 is an enlarged view of a main part of FIG. 2, showing a pillar guide. [Figure 9] FIG. 4 is a front view of the back frame, the set bracket, and the shaft support bracket. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. This embodiment relates to a vehicle seat having a back frame and a belt retractor attached to the back frame for winding up a seat belt, which makes it possible to suppress discomfort felt by the occupant at the location where the belt retractor is attached. The side of the vehicle seat where the occupant sits relative to the seat back is the "forward side." The direction of travel of the vehicle is the "forward / rearward direction," and the left / right direction when the vehicle is facing the direction of travel 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 arranged side by side in the seat width direction. The vehicle seat S is a seat that can be arranged in two different configurations: a "normal state" in which an occupant can be seated, and a "storage state (mobile 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 vehicle seat S is switched to a "stored state" in which the seat body is tilted forward and folded and stored on the vehicle floor. Also, the vehicle seat S returns to the "normal state" by manually raising the seat body upward from the "stored state".

[0020] As shown in Figures 1 and 2, a vehicle seat S comprises 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 attached inside the seat back 1 and restrains the upper body of a seat occupant, a retractor bracket 50 for mounting a belt retractor 42 of the seat belt device 40, and a belt guide bracket 60 for guiding a seat belt 41 extending from the belt retractor 42. The vehicle seat S also includes support legs 70 that are attached between the seat cushion 2 and the vehicle floor and support the seat body, a switching device 80 that is attached to the side portion of the seat back 1 and switches the seat body from a "normal state" to a "stored state," and an arm lock device 90 that rotatably connects the armrest 4 to the seat back 1.

[0021] As shown in Figures 1 and 2, the seat back 1 is a backrest portion that supports the back of the occupant from behind, and includes a back frame 10 that forms the skeleton, a padding material 1a that is placed on the back frame 10, and a skin material 1b that covers the back frame 10 and the padding material 1a. The seat cushion 2 is a seating portion that supports the occupant from below, and includes a cushion frame that serves as a skeleton, a pad material 2a that is placed on the cushion frame, and a cover material 2b that covers the cushion frame and the pad material 2a. The headrest 3 is a head portion that supports the head of an occupant from behind, and includes a headrest pillar that serves as a core material, a padding material 3a that is placed on the headrest pillar, and a cover material 3b that covers a cushion frame and the padding material 3a. The armrest 4 is a member that supports the arms of a seated occupant from below, and is also called a center armrest.

[0022] As shown in Figures 2 to 4, the back frame 10 consists of a substantially rectangular frame body that forms the skeleton of the seat back 1, and includes a plate-shaped rear frame 20 that forms 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. More specifically, the back frame 10 is formed by combining a rear frame 20 and a 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 an opposing state (by laser welding from the front of the seat or from the rear of the seat).

[0023] As shown in Figures 2 to 4, the rear frame 20 is a plate-shaped panel frame and includes a rectangular frame main body 21, a first through hole 22 for assembling the belt retractor 42, a vehicle body mounting portion 23 for assembling the switching device 80 (vehicle body mounting bracket 81), a pillar mounting portion 24 for assembling the pillar 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 (set bracket 84), and an arm mounting portion 27 for assembling the armrest 4 (arm bracket 91).

[0024] The frame body 21 has an uneven structure in which parts of the frame body 21 bulge forward and backward. In addition, a flange is formed on the outer edge of the frame body 21. Specifically, an upper end flange 21a, a lower end flange 21b, a right end flange 21c, and a left end flange 21d are formed on the outer edge of the frame main body 21. In addition, forward bulging portions 21e, 21f that bulge forward are formed on the left and right side portions and the lower portion of the frame main body 21. In addition, forward bulging portions 21g, 21h that bulge forward are formed on the diagonal line of the frame main body 21. Therefore, the rigidity of the rear frame 20 can be increased. A plurality of openings are formed at intervals in the vertical and horizontal directions on the front surface of the frame body 21. This allows the rear frame 20 to be made lighter in weight.

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

[0026] As shown in Figures 2 to 4, the front frame 30 is a plate-shaped panel frame and includes a rectangular frame main body 31, a second through hole 32 for assembling the belt retractor 42, a vehicle body mounting portion 33 for assembling the switching device 80 (vehicle body mounting bracket 81), a pillar mounting portion 34 for assembling the pillar 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 (set bracket 84), and an arm mounting portion 37 for assembling the armrest 4 (arm bracket 91).

[0027] The frame body 31 has an uneven structure in which parts of the frame body 31 bulge forward and backward. In addition, 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 main body 31. In addition, forward bulging portions 31e, 31f that bulge forward are formed on the left and right side portions and the lower end portion of the frame main body 31, respectively. In addition, rear bulging portions 31g, 31h that bulge backward are formed on the diagonal lines of the frame main body 31. In addition, a rear bulging portion 31i is also formed in the center portion of the frame main body 31. This makes it possible to increase the rigidity of the front frame 30. In addition, by butting the rear bulging portion of the front frame 30 and the front bulging portion of the rear frame 20 together and welding them, the rigidity of the back frame 10 can be further increased.

[0028] The front frame 30 is assembled by being attached to the rear frame 20 with the first through hole 22 and the second through hole 32 communicating with each other. The second through hole 32 is a substantially rectangular through hole penetrating the thickness direction of the front frame 30, and is formed in an upper part of the front frame 30. The second through hole 32 is disposed at a position opposite to the first through hole 22. The second through hole 32, the left and right vehicle body mounting portions 33, and the left and right pillar mounting portions 34 are disposed at positions that overlap in the vertical direction (at the same height position). Furthermore, the left and right shaft attachment parts 36 and arm attachment parts 37 are disposed at positions where they overlap in the vertical direction (at the same height position).

[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 and width directions of the back frame 10. Therefore, the assembly work of the belt retractor 42 can be facilitated.

[0030] In the above configuration, a reinforcing flange 22a extending along the edge of the first through hole 22 is formed in the rear frame 20, as shown in FIG. Therefore, the rigidity of the portion of the back frame 10 to which the belt retractor 42 is attached can be increased.

[0031] 8, in the above configuration, a reinforcing bead 31j having a substantially triangular shape that bulges toward the rear of the seat is formed in the front frame 30 between the left and right pillar guides 38. This increases the assembly rigidity of the pillar guides 38 in the back frame 10. A rectangular opening 38a is formed on the front surface of the lower portion of the pillar guide 38. This allows the weight of the pillar guide 38 to be reduced. Furthermore, a plurality of fixed portions 38c, 38d (welded portions) of the pillar guide 38 are formed on the front surface of the back frame 10 at intervals in the up-down direction. This makes it possible to suppress rotation of the pillar guide 38.

[0032] As shown in Figures 1 to 4, the seat belt device 40 includes a seat belt 41 that restrains the upper body of a seated occupant, a belt retractor 42 that is attached to the back frame 10 and winds up the seat belt 41 so that it can be withdrawn, 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 withdrawn from the belt retractor 42.

[0033] 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 above the seat. The upward extending portion is guided toward the front of the seat along the outer circumferential surface of the upper end portion of the back frame 10. The extending portion toward the front of the seat abuts against the upper surface of the belt guide 43 and is guided along the belt guide 43 toward the bottom of the seat. 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 Figures 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 positioned so as to overlap the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10. The belt retractor 42 is attached to the back frame 10 via a retractor bracket 50 .

[0035] The belt retractor 42 is a box-shaped module and has a retractor body 42a, a rotating shaft 42b that is supported by the retractor body 42a and serves as the center of rotation of the seat belt 41, a mounting portion 42c (mounting hole) that is positioned below the rotating shaft 42b and is attached to the retractor bracket 50, and a positioning portion 42d that is positioned between the rotating shaft 42b and the mounting portion 42c and is used to position 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 (when viewed from the side of the back frame 10). Therefore, the belt retractor 42 can be prevented from projecting forward from the back frame 10, improving the seating feeling.

[0037] 7, the rotation 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. In addition, the rotation 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 rotation shaft 42b of the belt retractor 42 can be suitably protected in the thickness direction of the back frame 10.

[0038] The belt guide 43 shown in FIG. 1 is disposed at the upper end of the back frame 10, and is attached to the back frame 10 via a belt guide bracket 60. As shown in FIG. The belt guide 43, like the belt retractor 42, is disposed at a position overlapping the rear frame 20 and the front frame 30 in the thickness direction of the back frame 10.

[0039] The retractor bracket 50 is a bracket for attaching the belt retractor 42 to the back frame 10, and is attached inside the first through hole 22 and the second through hole 32, as shown in FIGS. Specifically, the retractor bracket 50 is attached to the front frame 30 so as to span across the outer edge of the second through hole 32 . The retractor bracket 50 is disposed 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 main body wall portion 50a that is long in the vertical direction, a bottom wall portion 50b extending forward from the lower end of the main body wall portion 50a, and left and right side wall portions 50c extending forward from both widthwise ends of the main body wall portion 50a. The retractor bracket 50 is formed on the main body wall portion 50a, and has a retractor mounting portion 51 (mounting hole) for assembling the belt retractor 42, and a retractor positioning portion 52 (positioning hook). The retractor bracket 50 also has a first frame mounting portion 53 formed on the extended end of the bottom wall portion 50b and hooked onto the front surface of the front frame 30, and a second frame mounting portion 54 and a third frame mounting portion 55 formed on the extended ends of the left and right side wall portions 50c, respectively, and hooked onto the front surface of the front frame 30.

[0041] The retractor mounting portion 51 is connected to the belt retractor 42 by fastening a mounting bolt 56 in a state where the retractor mounting portion 51 abuts against the belt retractor 42 (mounting portion 42c). The retractor positioning portion 52 is hooked to the belt retractor 42 (the positioning portion 42d) to position the belt retractor 42. The retractor mounting portion 51 and the retractor positioning portion 52 are formed on the front surface of the bulging portion 50d of the main body wall portion 50a, thereby improving the assembly rigidity.

[0042] The frame attachment portions 53, 54, and 55 are each bridged over the outer edge of the second through hole 32 of the front frame 30. Specifically, the frame attachment portions 53, 54, and 55 and the outer edge portion of the second through hole 32 are overlapped and welded. The third frame mounting portion 55 has a front wall portion 55a overlapping the front surface of the outer edge of the second through hole 32, an upper wall portion 55b protruding rearward from the upper end of the front wall portion 55a and overlapping the upper surface of the front frame 30, a side wall portion 55c protruding rearward from the side end of the front wall portion 55a and overlapping the side surface of the outer edge of the second through hole 32, and a reinforcing wall portion 55d protruding laterally from the rear end of the side wall portion 55c and overlapping 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, a convex reinforcing portion 32a is formed on the front surface of the front frame 30 at a portion where the frame mounting portions 53, 54, 55 are attached. This can improve the rigidity of the portion of the back frame 10 to which the belt retractor 42 is attached. The reinforcing portion 32a may be a reinforcing protrusion or a reinforcing recess, or may be a reinforcing flange, a reinforcing bead, or the like.

[0045] 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, as shown in FIGS. Specifically, the belt guide bracket 60 is attached to the outer edge of the second through hole 32 in the front frame 30 . A portion 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 at a position above the retractor bracket 50 .

[0046] The belt guide bracket 60 has a front wall portion 60a that is elongated in the seat width direction, an upper wall portion 60b extending forward from the upper end of the front wall portion 60a, a bottom wall portion 60c extending rearward from the lower end of the front wall portion 60a, and a rear wall portion 60d extending downward from the extended end of the bottom wall portion 60c. The belt guide bracket 60 has a frame attachment portion 61 formed on the front wall portion 60 a 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, which supports 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 legs 70 each include leg body portions 71 arranged on the left and right sides in the seat width direction, and a leg connecting portion 72 connecting the lower ends of the leg body portions 71 together. An upper end of the leg body 71 is connected to the inside of the seat cushion 2. In addition, a 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 of the support leg 70 projects further forward of the seat than the lower end of the support leg 70, and is inclined upward and forward from the lower end to the upper end of the support leg 70.

[0048] The switching device 80, as shown in FIGS. 1 to 4 and 9, is a device for switching the vehicle seat S from a "normal state" to a "stored state" and is attached to a side portion of the back frame . The switching device 80 includes a vehicle body mounting bracket 81 that is attached to the upper portion of the back frame 10, a locking member 82 that removably engages with a striker that is part of the vehicle body and locks the rotational movement of the back frame 10, an operating lever 83 that is operated to release the locked state of the back frame 10, and a connecting cable that connects the locking member 82 and the operating lever 83. As shown in FIG. 9, the switching device 80 also 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 rotating shaft 87. A spiral spring is attached around the rotating shaft 87 to bias the back frame 10 toward the front of the seat.

[0049] When the seat body is in the "normal state", the switching device 80 can release the locked state of the lock member 82 by operating the operating lever 83. When the locked state is released, the seat back 1 is tilted forward by the biasing force of a spiral spring (not shown) and folded together with the seat cushion 2, and switched to a "stored state" in which the seat back 1 is stored on the vehicle floor. In addition, with the rotation of the seat back 1, the support legs 70 can be rotated towards the seat cushion 2 and folded up.

[0050] 9, the set bracket 84 is attached to a corner portion 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 that is attached 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 overlapping with the mounting portion 84a of the set bracket 84, and an outer wall portion 85b protruding forward from the outer end portion of the bottom wall portion 85a. The intermediate bracket 85 has a shaft support portion 85c formed on the outer wall portion 85b, which supports the rotating shaft 87. The pivot bracket 86 is a bracket having an L-shaped cross section and has a bottom wall portion 86a overlapping with the mounting portion 84a of the set bracket 84, and an outer wall portion 86b protruding forward from the outer end portion of the bottom wall portion 86a. The pivot bracket 86 has a shaft support portion 86c formed on the outer wall portion 86b and supporting the rotation shaft 87.

[0051] In the above configuration, as shown in FIG. 9, the set bracket 84 (mounting portion 84a), the intermediate bracket 85 (bottom wall portion 85a) and the pivot bracket 86 (bottom wall portion 86a) are arranged in overlapping positions in the thickness direction of the seat back 1 and are fastened together. Therefore, the assembly rigidity of the bracket and the rotating 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 disposed at different positions in the seat front-rear direction, the seat width direction, and the up-down direction. By separating the fixing point between the brackets and the rotation center of the rotation shaft 87 in this manner, the switching device 80 can be operated smoothly.

[0053] Through the above series of operations, the seat body is stored in the vehicle 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 "storage state" to the "normal state," the occupant can, for example, lift the seat body with his or her hand against the biasing force of a spiral spring (not shown), thereby engaging the locking member 82 of the switching device 80 with the striker and switching the back frame 10 to the locked state.

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

[0055] As shown in FIG. 2, the arm brackets 91 are brackets having an L-shaped cross section, and are attached to the center and corners of the front surface of the back frame 10. More 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 the vehicle, but is not particularly limited thereto and may be a front seat of the vehicle or a middle seat in a vehicle having three rows of seats.

[0057] In the above embodiment, the vehicle seat S is a seat that can be arranged between a "normal state" and a "storage state (moving state)", but is not particularly limited thereto, and may be a seat that can be arranged into three different forms, for example, a "normal state", a "storage state (moving state)", and a "tip-up state (moving state)" in which the seat body is flipped up.

[0058] In the above embodiment, the vehicle seat S is directly fixed to the vehicle floor as shown in Fig. 2, but is not particularly limited thereto. 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.

[0059] In the above embodiment, laser welding or arc welding is used when assembling the frames together or the frame and the bracket, but there is no particular limitation, and various other welding methods such as spot welding may be used. Each component may be attached by a method other than welding.

[0060] In the above embodiment, a storable vehicle seat used in an automobile was described as a specific example, but the present invention is not limited to this and can be used as a vehicle seat for trains, buses, etc., as well as a vehicle seat for airplanes, ships, etc.

[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 understanding of the present invention, and is not intended to limit the present invention. The present invention can be modified or improved without departing from the spirit of the present invention, and the present invention naturally includes equivalents thereof. [Explanation of symbols]

[0062] S Vehicle seat 1 Seat back 1a, 2a, 3a padding 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 bulge 22 First through hole 22a Reinforcement flange 23 Vehicle mounting part 24 Pillar mounting part 25 Anchor attachment part 26 Shaft mounting part 27 Arm attachment part 30 Front Frame 31 Frame body 31a Upper flange 31b Lower flange 31c Right end plunge 31d Left end flange 31e, 31f Front bulge 31g, 31h, 31i Rear bulge 31j Reinforcement bead 32 Second through hole 32a Reinforcement 33 Vehicle mounting part 34 Pillar mounting part 35 Anchor mounting part (anchor mounting hole) 36 Shaft mounting part 37 Arm attachment part 38 Pillar Guide 38a aperture 38b, 38c fixed part 39 Child seat anchor 40 Seat belt device 41 Seatbelt 41a Tongue plate 42 Belt retractor 42a Retractor body 42b Rotation axis 42c Mounting part (mounting hole) 42d Positioning part 42e Rear end 43 Belt guide 50 Retractor bracket 50a Body wall 50b Bottom wall part 50c side wall part 50d Bulge 51 Retractor mounting part (mounting hole) 52 Retractor positioning part (positioning hook) 53 First frame attachment part 54 Second frame attachment part 55 Third frame attachment part 55a Front wall 55b Upper wall part 55c side wall section 55d Reinforced wall 56 Mounting bolt 60 Belt guide bracket 60a Front wall 60b Upper wall 60c bottom wall 60d rear wall 61 Frame mounting part 62 Guide support part 70 Support legs 71 Script body part 72 Leg connection part 73 Leg support member 80 Switching Device 81 Vehicle mounting bracket 82 Locking member 83 Operating lever 84 Set Bracket 84a Mounting part 85 Intermediate bracket 85a Bottom wall 85b Outer wall 85c Shaft support part 86 Pivot bracket 86a Bottom wall 86b Outer wall 86c Shaft support part 87 Rotating shaft 90 Arm lock device 91 Arm bracket

Claims

1. The back frame forms the back structure of the seat back, A vehicle seat including a belt retractor attached to the back frame for winding up a seat belt, The back frame includes a plate-shaped rear frame constituting the back frame, and a front frame assembled to a front surface of the rear frame, A first through hole is formed in the rear frame, the first through hole penetrating the rear frame in a thickness direction, A second through hole is formed in the front frame at a position opposite to the first through hole and passing through the front frame in a thickness direction, the front frame is assembled to the rear frame in a state in which the first through hole and the second through hole are communicated with each other, A vehicle seat characterized in that the belt retractor is provided inside the first through hole and the second through hole of the back frame, and is positioned in a position overlapping the rear frame and the front frame in the thickness direction of the back frame.

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

3. 2. 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 and width directions of the back frame.

4. The belt retractor rotates to retract the seat belt, 2. The vehicle seat according to claim 1, wherein a rotation shaft of the belt retractor is disposed rearward of the front frame in a thickness direction of the back frame.

5. The belt retractor rotates to retract the seat belt, 2. The vehicle seat according to claim 1, wherein a rotation shaft of the belt retractor is disposed forward of the rear frame in a thickness direction of the back frame.

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

7. the retractor bracket has a retractor mounting portion for mounting the belt retractor, 7. The vehicle seat according to claim 6, wherein the retractor attachment portion is disposed rearward of the front frame in a thickness direction of the back frame.

8. the retractor bracket has a frame attachment portion for attachment to a front surface of the front frame, 7. The vehicle seat according to claim 6, wherein a reinforcing portion is formed in a portion of the front surface of the front frame to which the frame mounting portion is attached.

9. 2. The vehicle seat according to claim 1, wherein a reinforcing portion is formed on an edge of the first through hole in the rear frame, the reinforcing portion extending along the edge of the first through hole.

10. A switching device is provided 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 has a lock member that is provided on a side portion of the back frame and that locks the movement of the seat back in the normal state, 2. The vehicle seat according to claim 1, wherein the lock member and the belt retractor are disposed at the same height on the back frame.

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