Vehicle seat

Abstract

[Problem] To provide a vehicle seat that comprises a seat back that includes a base frame and a mobile frame that is tiltably connected to the base frame, wherein the seat back has a seatbelt winding device provided thereto and is also compact. [Solution] The present invention has a seat back frame (10) and a seatbelt winding device (204) that is supported on the seat back frame. The seat back frame includes a base frame (11) and a mobile frame (12) that is connected to the base frame so as to be tiltable in the front-rear direction. An upper end of the seatbelt winding device is below an upper end of the mobile frame and above a lower end of the mobile frame.

Description

Vehicle seats

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

[0002] Patent Document 1 discloses a vehicle seat including a seat back frame and a folding frame connected to the seat back frame so as to be tiltable. In the vehicle seat of Patent Document 1, a seat belt retractor is provided on the seat cushion.

[0003] JP 2017-094872 A

[0004] As described in Patent Document 1, a seat back with a folding function has a complex structure. On the other hand, if a seat belt retractor is provided on the seat back, it becomes easier for the seat occupant to pull out the seat belt to adjust it to shoulder or chest height, but installing a seat belt retractor increases the size of the seat back.

[0005] In view of the above background, the present invention aims to provide a vehicle seat having a seat back having a base frame and a movable frame connected to the base frame so as to be tiltable, in which a seat belt retractor is provided on the seat back and the seat back is configured compactly.

[0006] In order to solve the above problem, one aspect of the present invention comprises a seat back frame (10) and a seat belt retractor (204) supported by the seat back frame, the seat back frame including a base frame (11) and a movable frame (12) connected to the base frame so as to be tiltable in the fore-and-aft direction, and the upper end of the seat belt retractor is located below the upper end of the movable frame and above the lower end of the movable frame.

[0007] According to this aspect, the seat belt retractor for retracting the seat belt can be provided on the seat back, thereby improving the safety of the occupant. Furthermore, since the upper end of the seat belt retractor is located below the upper end of the movable frame and above the lower end of the movable frame, the seat back can be configured compactly.

[0008] In the above aspect, preferably, the movable frame has a pair of left and right movable side members (38) and a movable upper member (39) extending in the left-right direction and connecting the upper edges of the movable side members, and the seat belt retractor is arranged in a position biased toward the movable side member on one side, and at least a portion of the seat belt retractor is located inside the seat more than the movable side member on one side.

[0009] According to this aspect, at least a portion of the seat belt retractor is positioned inside the seat relative to the adjacent movable side member, so the seat back can be made more compact than if the entire seat belt retractor were positioned outside the seat.

[0010] In the above aspect, preferably, a central portion of the seat belt retractor is disposed closer to the seat inner side than the movable side member on one side.

[0011] According to this aspect, the central portion of the seat belt retractor is positioned inside the seat relative to the adjacent movable side member, so the seat back can be made more compact than if the entire seat belt retractor were positioned outside the seat.

[0012] In the above aspect, preferably, the entire seat belt retractor is located more inward of the seat than the movable side member on one side.

[0013] According to this aspect, the entire seat belt retractor is positioned inside the seat relative to the adjacent movable side member, so the seat back can be made more compact than if the entire seat belt retractor were positioned outside the seat.

[0014] In the above aspect, preferably, the movable frame is rotatably connected to the base frame about a rotation axis (X) extending in the left-right direction, and the lower end of the seat belt retractor is located above the rotation axis.

[0015] According to this aspect, the seat belt retractor can be installed in a position where it is less likely to be affected by the rotation of the movable frame.

[0016] In the above aspect, preferably, the movable frame is provided with a pressure-receiving member (74) that supports the weight of the seat occupant, and when the upper end of the movable frame is positioned at the rearmost position, the upper end of the seat belt retractor is positioned above the pressure-receiving member.

[0017] According to this aspect, the seat belt retractor can be installed in a position where it is less likely to be affected by the rotation of the movable frame.

[0018] In the above aspect, preferably, when the upper end of the movable frame is positioned at the rearmost position, the lower end of the seat belt retractor is positioned above the pressure-receiving member.

[0019] According to this aspect, the seat belt retractor can be installed in a position where it is less likely to be affected by the rotation of the movable frame.

[0020] In the above aspect, preferably, the movable frame has a pair of left and right movable side members (38) and a movable upper member (39) extending in the left-right direction and connecting the upper edges of the movable side members, and each of the movable side members is rotatably connected to the base frame and has a side portion (41) extending upward and a shoulder portion (42) extending from the upper end of the side portion at an angle upward toward the inside of the seat, bending upward at a bent portion (43) and extending further upward, and when the upper end of the movable frame is positioned at the rearmost position, the lower end of the seat belt retractor is positioned below the bent portion.

[0021] According to this aspect, at least a portion of the seat belt retractor is positioned below the movable frame, so the seat back can be made more compact than when the entire seat belt retractor is positioned above the movable frame.

[0022] In the above aspect, preferably, the seat belt retractor further includes an actuator (98) that tilts the movable frame relative to the base frame, the movable frame including a pair of left and right movable side members (38) and a movable upper member (39) extending in the left-right direction and connecting the upper edges of the movable side members, the actuator is coupled to the movable upper member and the base frame, and the end of the seat belt retractor on the inside of the seat is located outside the seat relative to the connection position between the actuator and the movable upper member.

[0023] According to this aspect, the end of the seat belt retractor on the inside of the seat is positioned inside the seat more than the connection position between the actuator and the movable upper member, so the seat back can be made more compact than if it were positioned on the outside of the seat.

[0024] In the above aspect, preferably, the movable frame is provided with a pressure-receiving member (74) that supports the back of the seat occupant, the pressure-receiving member is connected to the movable frame via an erection member (87), and the upper end of the seat belt retractor is positioned below the connection between the erection member and the movable frame.

[0025] According to this aspect, since the seat belt retractor is located below the joint between the installation member and the movable frame, the seat back can be made more compact than when it is located above.

[0026] In the above aspect, preferably, the base frame comprises a front frame (20) that receives the load of the occupant, and a rear frame (21) that is positioned opposite the front frame and connected to the front frame, and at least a portion of the seat belt retractor is located behind the front frame.

[0027] According to this aspect, at least a portion of the seat belt retractor is positioned behind the front frame, which prevents the seat occupant from feeling like there is something foreign in the seat belt, compared to when the seat belt retractor is positioned in front of the front frame.

[0028] One aspect of the present invention comprises a seat back frame (10) and a seat belt retractor (204) supported by the seat back frame, the seat back frame including a base frame (11) and a movable frame (12) connected to the base frame so as to be tiltable in the fore-and-aft direction, and the upper end of the seat belt retractor is located below the upper end of the movable frame and above the lower end of the movable frame.

[0029] According to this aspect, the seat belt retractor for retracting the seat belt can be provided on the seat back, thereby improving the safety of the occupant. Furthermore, since the upper end of the seat belt retractor is located below the upper end of the movable frame and above the lower end of the movable frame, the seat back can be configured compactly.

[0030] In the above aspect, preferably, the movable frame has a pair of left and right movable side members (38) and a movable upper member (39) extending in the left-right direction and connecting the upper edges of the movable side members, and the seat belt retractor is arranged in a position biased toward the movable side member on one side, and at least a portion of the seat belt retractor is located inside the seat more than the movable side member on one side.

[0031] According to this aspect, at least a portion of the seat belt retractor is positioned inside the seat relative to the adjacent movable side member, so the seat back can be made more compact than if the entire seat belt retractor were positioned outside the seat.

[0032] In the above aspect, preferably, a central portion of the seat belt retractor is disposed closer to the seat inner side than the movable side member on one side.

[0033] According to this aspect, the central portion of the seat belt retractor is positioned inside the seat relative to the adjacent movable side member, so the seat back can be made more compact than if the entire seat belt retractor were positioned outside the seat.

[0034] In the above aspect, preferably, the entire seat belt retractor is located more inward of the seat than the movable side member on one side.

[0035] According to this aspect, the entire seat belt retractor is positioned inside the seat relative to the adjacent movable side member, so the seat back can be made more compact than if the entire seat belt retractor were positioned outside the seat.

[0036] In the above aspect, preferably, the movable frame is rotatably connected to the base frame about a rotation axis (X) extending in the left-right direction, and the lower end of the seat belt retractor is located above the rotation axis.

[0037] According to this aspect, the seat belt retractor can be installed in a position where it is less likely to be affected by the rotation of the movable frame.

[0038] In the above aspect, preferably, the movable frame is provided with a pressure-receiving member (74) that supports the weight of the seat occupant, and when the upper end of the movable frame is positioned at the rearmost position, the upper end of the seat belt retractor is positioned above the pressure-receiving member.

[0039] According to this aspect, the seat belt retractor can be installed in a position where it is less likely to be affected by the rotation of the movable frame.

[0040] In the above aspect, preferably, when the upper end of the movable frame is positioned at the rearmost position, the lower end of the seat belt retractor is positioned above the pressure-receiving member.

[0041] According to this aspect, the seat belt retractor can be installed in a position where it is less likely to be affected by the rotation of the movable frame.

[0042] In the above aspect, preferably, the movable frame has a pair of left and right movable side members (38) and a movable upper member (39) extending in the left-right direction and connecting the upper edges of the movable side members, and each of the movable side members is rotatably connected to the base frame and has a side portion (41) extending upward and a shoulder portion (42) extending from the upper end of the side portion at an angle upward toward the inside of the seat, bending upward at a bent portion (43) and extending further upward, and when the upper end of the movable frame is positioned at the rearmost position, the lower end of the seat belt retractor is positioned below the bent portion.

[0043] According to this aspect, at least a portion of the seat belt retractor is positioned below the movable frame, so the seat back can be made more compact than when the entire seat belt retractor is positioned above the movable frame.

[0044] In the above aspect, preferably, the seat belt retractor further includes an actuator (98) that tilts the movable frame relative to the base frame, the movable frame including a pair of left and right movable side members (38) and a movable upper member (39) extending in the left-right direction and connecting the upper edges of the movable side members, the actuator is coupled to the movable upper member and the base frame, and the end of the seat belt retractor on the inside of the seat is located outside the seat relative to the connection position between the actuator and the movable upper member.

[0045] According to this aspect, the end of the seat belt retractor on the inside of the seat is positioned inside the seat more than the connection position between the actuator and the movable upper member, so the seat back can be made more compact than if it were positioned on the outside of the seat.

[0046] In the above aspect, preferably, the movable frame is provided with a pressure-receiving member (74) that supports the back of the seat occupant, the pressure-receiving member is connected to the movable frame via an erection member (87), and the upper end of the seat belt retractor is positioned below the connection between the erection member and the movable frame.

[0047] According to this aspect, since the seat belt retractor is located below the joint between the installation member and the movable frame, the seat back can be made more compact than when it is located above.

[0048] In the above aspect, preferably, the base frame comprises a front frame (20) that receives the load of the occupant, and a rear frame (21) that is positioned opposite the front frame and connected to the front frame, and at least a portion of the seat belt retractor is located behind the front frame.

[0049] According to this aspect, at least a portion of the seat belt retractor is positioned behind the front frame, which prevents the seat occupant from feeling like there is something foreign in the seat belt, compared to when the seat belt retractor is positioned in front of the front frame.

[0050] A perspective view of a seat according to an embodiment. A perspective view of a seat back frame, a movable frame, and an airbag module when a movable part is in an upright position. (A) Front view and (B) rear view of the seat back frame and the airbag module. A side view of the seat back frame when a movable part is in an upright position. (A) Perspective views of the front panel and (B) rear panel. A cross-sectional view taken along VI-VI in FIG. 2. A perspective view showing (A) a bead, (B) a first modified example of the bead, (C) a second modified example of the bead, and (D) a third modified example of the bead, which are provided on the front panel. A perspective view of the seat back frame, a movable frame, and an airbag module when a movable part is in a forward tilted position. A movable frame, 12A and 12B are perspective views of the seat back frame, the movable frame, and the airbag module when the movable part is in the upright position; 12C are perspective views of the seat back frame, the movable frame, and the airbag module when the movable part is in the forward tilted position; 12D are perspective views of the seat back frame, the movable frame, and the airbag module when the movable part is in the forward tilted position;

[0051] Hereinafter, an embodiment of a vehicle seat according to the present invention will be described with reference to the drawings. In the following description, left and right are defined based on the position of an occupant seated in the seat.

[0052] Additionally, the direction toward the center of the seat in the left-right direction (also referred to as the seat width direction) when viewed from the front is referred to as the inward side of the seat (or the seat inner side), and the direction away from the center of the seat in the left-right direction is referred to as the outward side of the seat (or the seat outer side).

[0053] <Overall Structure of the Seat> As shown in FIG. 1 , a vehicle seat (hereinafter referred to as seat 1) is placed on a floor 3 that defines the bottom of a passenger compartment 2 (also referred to as the vehicle interior) of an automobile. The seat 1 has a seat cushion 4 provided on the floor 3, a seat back 5 extending upward from the rear of the seat cushion 4, and a headrest 6 provided on the upper part of the seat back 5. The seat cushion 4 forms a seating surface 4S and supports the buttocks of a seated occupant. The seat back 5 forms a backrest surface 5S facing forward and supports the back of the seated occupant. The headrest 6 is positioned behind the head of the seated occupant. The seat cushion 4 may be supported on the floor 3 via a sliding device (not shown) so as to be slidable back and forth.

[0054] The seat back 5 includes a base portion 8 that forms the lower half of the seat back surface 5S, and a movable portion 9 that forms the upper half of the seat back surface 5S. The movable portion 9 is connected to and supported by the base portion 8 so as to be rotatable about a rotation axis X (also called a pivot axis) that passes through the lower portion and extends in the left-right direction. This allows the upper half of the seat back surface 5S to be tilted relative to the lower half. In this embodiment, the headrest 6 is fixed to the upper portion of the movable portion 9.

[0055] The seat 1 is configured so that the upper half of the backrest surface 5S can be tilted relative to the lower half, and the center portion of the seat back 5 can be folded. For this reason, the seat back 5 of the seat 1 is also referred to as a center-folding seat back. Hereinafter, the position of the movable part 9 when the upper part of the movable part 9 is tilted all the way back will be referred to as the upright position (also referred to as the backward tilt position), and the position of the movable part 9 when the upper part of the movable part 9 is tilted all the way forward after rotating from the upright position around the rotation axis X will be referred to as the forward tilt position.

[0056] The seat cushion 4 includes a seat cushion frame (not shown) that forms a skeleton, a pad member (not shown) supported by the seat cushion frame, and a skin material (not shown) that covers at least a portion of the surface of the pad member. The pad member that constitutes the seat cushion 4 is formed from a resilient cushion material such as polyurethane foam, and the skin material that covers the pad member may be formed from genuine leather, synthetic leather, fabric, or the like. The seat cushion 4 is formed by covering the pad member and the skin material on the seat cushion frame.

[0057] The seat back 5 includes a seat back frame 10 that forms a framework, a pad member (not shown) supported by the seat back frame 10, and a skin material (not shown) that covers at least a portion of the surface of the pad member. To facilitate folding of the seat back 5, the pad member may be configured such that an upper half that constitutes the movable portion 9 and a lower half that constitutes the base portion 8 are separate bodies, or the upper half that constitutes the movable portion 9 and the lower half that constitutes the base portion 8 may be integrally formed. Similarly, the skin material may be configured such that an upper half that constitutes the movable portion 9 and a lower half that constitutes the base portion 8 are separate bodies.

[0058] Next, the seat back frame 10 will be described in detail.

[0059] 2, the seatback frame 10 has a base frame 11 that forms the framework of the base portion 8, and a movable frame 12 that forms the framework of the movable portion 9 and is connected to the base frame 11 so as to be tiltable (rotatable) about a rotation axis X. A reclining shaft 13 to which a seat cushion frame is connected is provided at the bottom of the base frame 11.

[0060] <Base Frame> As shown in Figures 2, 3(A), and 3(B), the base frame 11 is a rectangular frame including a pair of left and right base side members 14, a base upper member 15, and a base lower member 16. The base side members 14 each extend in the vertical direction and are spaced apart on the left and right. The base upper member 15 extends left and right and connects the upper portions (upper ends, in this embodiment) of the two base side members 14. The base lower member 16 also extends left and right and connects the lower portions of the two base side members 14. As a result, the base frame 11 has a rectangular frame shape when viewed from the front.

[0061] In this embodiment, as shown in FIG. 3B , the base frame 11 includes two base middle members 17 that connect the vertical center of the left base side member 14 with the vertical center of the right base side member 14. The two base middle members 17 are spaced apart vertically. Hereinafter, the upper base middle member 17 will be referred to as the upper middle member 17U, and the lower base middle member 17 will be referred to as the lower middle member 17D. The horizontal center of the upper middle member 17U and the horizontal center of the base upper member 15 are connected by a center member 18.

[0062] Each base side member 14 is provided with a plate-shaped side edge portion 19 that extends from its rear end toward the inside of the seat and has a surface facing forward. The front surface of the side edge portion 19 and the wall surface of the base side member 14 on the inside of the seat are connected at a substantially right angle in top view.

[0063] As shown in FIGS. 4, 5A, and 5B, the base frame 11 includes a front panel 20 (also called a front member or a front frame) and a rear panel 21 (also called a rear member or a rear frame).

[0064] As shown in Fig. 5(A), the front panel 20 is a rectangular frame made of bent sheet metal members. The front panel 20 constitutes the seat occupant side of the base frame 11 and bears the weight of the occupant. As shown in Fig. 5(B), the rear panel 21 is also a rectangular frame made of bent sheet metal members. The rear panel 21 is disposed opposite the front panel 20 and constitutes the side of the base frame 11 away from the seat occupant.

[0065] 6, the rear panel 21 has an outer frame portion 21A that forms the seat outer surface of the base side member 14, a first extension portion 21B that extends from the front edge of the outer frame portion 21A toward the inside of the seat, and a second extension portion 21C that extends from the rear edge of the outer frame portion 21A toward the inside of the seat. The front panel 20 has an inner frame portion 20A that forms the seat inner portion of the base side member 14, a third extension portion 20B that extends from the front edge of the inner frame portion 20A toward the outside of the seat, and a fourth extension portion 20C that extends from the front edge of the inner frame portion 20A toward the inside of the seat. The inner frame portion 20A and the outer frame portion 21A are opposed to each other and are arranged at positions spaced apart. The first extending portion 21B and the third extending portion 20B are overlapped, and the second extending portion 21C and the fourth extending portion 20C are overlapped and joined (welded in this embodiment), so that the rear panel 21 is joined to the front panel 20 at its edges. The rear panel 21 cooperates with the front panel 20 to form a closed cross-sectional structure P. As a result, a cavity 22 is formed in the base frame 11, making the base frame 11 hollow.

[0066] In this embodiment, the second extending portion 21C partially connects the left and right outer frame portions 21A, and the fourth extending portion 20C partially connects the inner frame portion 20A. The base middle member 17 is formed by overlapping and joining the second extending portion 21C and the fourth extending portion 20C. The central member 18 (more specifically, the vertical center portion of the central member 18) is mainly composed of the rear panel 21 only.

[0067] 3A and 3B, two airbag modules 24 are coupled to the base frame 11. One of the airbag modules 24 is coupled to the vehicle exterior side (left side in this embodiment) of the base frame 11 (base side member 14). As a result, the airbag module 24 coupled to the vehicle exterior side of the base frame 11 constitutes an outer airbag module 24L.

[0068] The other airbag module 24 is connected to the vehicle interior side (the right side in this embodiment) of the base frame 11 (base side member 14). As a result, the airbag module 24 connected to the vehicle interior side of the base frame 11 constitutes an inner airbag module 24R that includes a near-side airbag.

[0069] The outer airbag module 24L and the inner airbag module 24R are located on the left and right sides of the movable frame 12, respectively, and are connected to the side surfaces of the rear panel 21 on the seat outer side. This allows the airbag modules 24 to be mounted on both the left and right sides of the base frame 11 on the seat outer side. This allows the airbags 25 to be deployed on both sides of the seat outside the seat of the seat occupant, thereby improving the safety of the seat 1.

[0070] <Airbag Module, Bolt Holes, and Access Holes> As shown in Figure 6, the airbag module 24 includes an airbag 25, an inflator 26 that inflates the airbag 25 by introducing gas into the interior of the airbag 25, and a case 27 that houses the airbag 25 and the inflator 26. A retainer 28 is provided on the side of the airbag module 24 facing the seat interior. A plurality of stud bolts 29 are provided on the inflator 26. The stud bolts 29 pass through the retainer 28 and the bottom wall of the case 27 located on the seat interior, and protrude toward the seat interior.

[0071] 4 and 5B, the outer frame portion 21A of the rear panel 21 is provided with fastening holes 30 through which stud bolts 29 pass. The stud bolts 29 are inserted into the corresponding fastening holes 30 and fastened with nuts 31, thereby fastening the airbag module 24 to the seat-outside side surface of the base side member 14 (i.e., the seat-outside side surface of the rear panel 21). Hereinafter, the joint portion of the rear panel 21 with the outer airbag module 24L will be referred to as a rear joint portion 32. In this embodiment, the rear joint portion 32 is formed by the fastening holes 30.

[0072] As shown in FIGS. 2 and 5A, the front panel 20 is provided with an access hole 33, which is a through hole for accessing the fastening hole 30 from the inside of the seat.

[0073] 4, the access hole 33 is configured so that at least one of the front-to-rear width and the up-to-down width (preferably both) is larger than the fastening hole 30, and the area of ​​the opening of the access hole 33 is larger than the area of ​​the opening of the fastening hole 30. This allows an operator to easily pass the nuts 31 and tools through the access hole 33, thereby improving the workability of assembling the airbag module 24.

[0074] In this embodiment, each airbag module 24 is provided with two stud bolts 29. Furthermore, four fastening holes 30 are arranged vertically in a row in one base side member 14 so that the airbag module 24 can be assembled in two positions (hereinafter referred to as upper and lower positions). Hereinafter, the four fastening holes 30 will be referred to as a first fastening hole 30A, a second fastening hole 30B, a third fastening hole 30C, and a fourth fastening hole 30D, in order from top to bottom.

[0075] The airbag module 24 is assembled to the base side member 14 in an upper position by inserting and fastening the stud bolts 29 into the first fastening hole 30A and the third fastening hole 30C, respectively. On the other hand, the airbag module 24 is assembled to the base side member 14 in a lower position by inserting and fastening the stud bolts 29 into the second fastening hole 30B and the fourth fastening hole 30D, respectively.

[0076] Therefore, two access holes 33 are provided in the inner frame portion 20A of the front panel 20: an upper access hole 33A located on the seat inside of the first fastening hole 30A and the second fastening hole 30B, and a lower access hole 33B located on the seat inside of the third fastening hole 30C and the fourth fastening hole 30D. The upper access hole 33A and the lower access hole 33B are formed side by side in the front panel 20.

[0077] 4, the upper access hole 33A is formed to overlap the first fastening hole 30A and the second fastening hole 30B in a side view. The upper edge of the upper access hole 33A is located above the upper edge of the first fastening hole 30A, and the lower edge of the upper access hole 33A is located below the lower edge of the second fastening hole 30B.

[0078] The lower access hole 33B is formed to overlap the third fastening hole 30C and the fourth fastening hole 30D in a side view. The upper edge of the lower access hole 33B is located above the upper edge of the third fastening hole 30C, and the lower edge of the lower access hole 33B is located below the lower edge of the fourth fastening hole 30D.

[0079] 2 and 5A, beads 35 are provided in the vicinity of the access holes 33 of the front panel 20. The beads 35 function as rigidity enhancing portions that increase the rigidity of the portions of the front panel 20 near the access holes 33. In this embodiment, the beads 35 are provided rearward of the two access holes 33, at corners 36 that are connecting portions between the side edge portions 19 and the base side members 14 (inner frame portions 20A). The beads 35 form protruding ridges at the corners 36. The beads 35 may be formed by pushing (bending) the front panel 20 at the corners 36 in a direction that tilts forward toward the seat interior.

[0080] 7A shows an enlarged view of the vicinity of the bead 35 of the front panel 20. As shown in FIG. 7A, one bead 35 is provided at a corner 36 of the front panel 20 so as to extend in the vertical direction. The upper end of the bead 35 is located below the upper end of the upper access hole 33A. The lower end of the bead 35 is located below the lower end of the lower access hole 33B.

[0081] However, the number, shape, and arrangement of the beads 35 are not limited to the embodiment shown in Fig. 7(A). Figures 7(B) to (D) show modified examples of the number, shape, and arrangement of the beads 35.

[0082] 7B, one bead 35 is provided to extend vertically at the corner 36. The upper end of the bead 35 is located above the upper end of the upper access hole 33A. The lower end of the bead 35 is located below the lower end of the lower access hole 33B.

[0083] 7C, one bead 35 is provided at the corner 36 so as to extend in the vertical direction. The upper end of the bead 35 is located above the upper end of the upper access hole 33A. The lower end of the bead 35 is located above the lower end of the lower access hole 33B.

[0084] 7(D), multiple beads 35 are arranged vertically. The beads 35 may be arranged vertically at equal intervals. The upper end of the uppermost bead 35 is located above the upper access hole 33A. The lower end of the lowermost bead 35 is located below the lower access hole 33B.

[0085] 7A to 7D show beads 35 provided on the vehicle exterior side base side member 14, but beads 35 of corresponding shapes may also be provided on the vehicle interior side base side member 14. The beads 35 provided on the vehicle exterior side base side member 14 and the beads 35 provided on the vehicle interior side base side member 14 may have the same (bilaterally symmetrical) shape, or one may be formed to be longer than the other. In the example shown in FIG. 7D, the number of beads 35 provided on the vehicle exterior side base side member 14 may be different from the number of beads 35 provided on the vehicle interior side base side member 14.

[0086] 6, the front panel 20 may be joined to the rear panel 21 at a position that avoids the bead 35. This makes it possible to easily join the front panel 20 and the rear panel 21. Note that various known methods such as joining by laser welding or bolt fastening can be used to join the front panel 20 and the rear panel 21.

[0087] On the other hand, the front panel 20 may be joined to the rear panel 21 at a position overlapping the bead 35. This allows the front panel 20 to be joined to the rear panel 21 at a portion with high rigidity.

[0088] <Movable Frame> As shown in Figures 2, 8, and 9, the movable frame 12 includes a pair of left and right movable side members 38 and a movable upper member 39. The movable side members 38 are spaced apart from each other and extend in the vertical direction. The movable upper member 39 also extends in the horizontal direction and connects the upper portions of the two movable side members 38. The lower ends of each movable side member 38 are coupled to the base side member 14 via pivot brackets 40 (also referred to as mounting members) so as to be rotatable about the rotation axis X. As can be seen from Figures 2 and 9, the movable frame 12 is coupled to the base frame 11 so as to be rotatable (i.e., tiltable) about the rotation axis X.

[0089] In this embodiment, the movable frame 12 is made of a bent pipe material, but is not limited to this and may be made of one or more sheet metal members.

[0090] 9 , each movable side member 38 has a movable member side portion 41 constituting a lower portion and movable member shoulder portions 42 constituting a central and upper portion. Each movable member side portion 41 extends in the vertical direction. Each movable member side portion 41 is connected at its lower end to a base side member 14 on the seat inner side via a pivot bracket 40 so as to be rotatable about a rotation axis X. Each movable member shoulder portion 42 is connected to an upper end of the movable member side portion 41. The movable member shoulder portion 42 extends obliquely upward from the upper end of the movable member side portion 41 toward the seat inner side, then bends upward at a movable member bend portion 43, and continues to extend upward. The movable member shoulder 42 of the left movable side member 38 is connected at its upper end to the left end of the movable upper member 39, and the movable member shoulder 42 of the right movable side member 38 is connected at its upper end to the right end of the movable upper member 39.

[0091] 2, in this embodiment, auxiliary members 44 are provided on the movable frame 12 and connected to the left and right movable side members 38. The auxiliary members 44 are made of bent wires, and are connected to the corresponding movable side members 38 at both left and right ends.

[0092] As shown in FIG. 10 , the pivotal bracket 40 is fixed to the base frame 11 (more specifically, the base side member 14) and connects the movable frame 12 to the base frame 11 (the base side member 14) so ​​as to be pivotable (also referred to as rotatable) about the rotation axis X.

[0093] The pivoting bracket 40 is made of a bent sheet metal member and includes a pivoting bracket front portion 45 connected to the seat-inner side surface of one of the left and right base side members 14, and a pivoting bracket rear portion 46 extending inward from the rear edge of the pivoting bracket front portion 45 and connected to the front surface of the side edge portion 19.

[0094] The pivot bracket front portion 45 has a flat plate portion 45A and a bulging portion 45B that bulges inward toward the seat. The plate portion 45A is disposed along the seat-inner side surface of the front panel 20 that constitutes the base side member 14. The bulging portion 45B is circular in side view. The bulging portion 45B is spaced apart from the seat-inner side surface of the front panel 20 that constitutes the base side member 14. A through-hole 48 (see FIG. 9) is provided at the lower end of each of the movable side members 38. A pin 49 (see FIG. 10) that passes through the through-hole 48 and extends in the left-right direction is fixed to the bulging portion 45B. This connects the movable side member 38 to the pin 49 for rotation about the rotation axis X. This connects the movable side member 38 to the seat-inner side surface of the bulging portion 45B for rotation about the rotation axis X.

[0095] 9, the pivot bracket front portion 45 and the pivot bracket rear portion 46 each have a bolt hole 50. Hereinafter, the bolt hole 50 provided in the pivot bracket front portion 45 will be referred to as a front bolt hole 50A, and the bolt hole 50 provided in the pivot bracket rear portion 46 will be referred to as a rear bolt hole 50B.

[0096] A stud bolt 52 protruding toward the inside of the seat is provided in a wall of the base side member 14 of the front panel 20 that forms the seat inner side. As shown in FIGS. 5A and 5B , in this embodiment, a first through hole 53 penetrating the wall is provided in the wall that forms the seat inner side of the base side member 14 of the front panel 20. The stud bolt 52 is inserted into the first through hole 53 and fixed to the front panel 20. A second through hole 54 penetrating in the plate thickness direction (front-to-rear direction) is provided in a portion of the side edge portion 19 that is located on the seat inner side of the first through hole 53. In this embodiment, the second through hole 54 penetrates both the front panel 20 and the rear panel 21. However, the second through hole 54 may be configured to penetrate only the front panel 20.

[0097] A stud bolt 52 is inserted into the front bolt hole 50A and the first through-hole 53, and a nut 55 is fastened to the stud bolt 52, thereby fastening the pivot bracket front portion 45 to the side surface on the seat inside of the base side member 14. A bolt 56 is inserted into the rear bolt hole 50B and the second through-hole 54, and a nut 57 is fastened to the front surface of the side edge 19. In this way, the pivot bracket 40 is fastened and fixed to the inner surface on the seat inside of the front panel 20 and to the side edge 19.

[0098] Hereinafter, the first through-hole 53 and the second through-hole 54, which are the connecting portions of the front panel 20 with the pivoting bracket 40, will be collectively referred to as a front connecting portion 58. The pivoting bracket 40 is fastened to the front connecting portion 58 of the front panel 20, and the movable frame 12 is rotatably connected to the front connecting portion 58 via the pivoting bracket 40. The front panel 20 is provided with two front connecting portions 58.

[0099] As shown in Fig. 2, the pivoting bracket 40 is located between the outer airbag module 24L and the inner airbag module 24R. The pivoting bracket 40 is located above the rear joint portion 32. As a result, the two front joint portions 58, which are joint portions between the front panel 20 and the movable frame 12, are both located above the rear joint portion 32. As shown in Fig. 10, the front joint portions 58 are provided in front of and behind the rear joint portion 32. Because the pivoting bracket 40 is joined to the front panel 20 at the front and rear of the rear joint portion 32, the movable frame 12 can be firmly joined to the front panel 20.

[0100] As shown in Figures 9 and 10, the pivoting bracket 40 has a flange portion 60. The flange portion 60 is plate-shaped and extends forward from the lower edge of the pivoting bracket rear portion 46. The flange portion 60 is rectangular with a surface facing in the up-down direction. As shown in Figure 10, the flange portion 60 has an insertion hole 62 that penetrates in the up-down direction at approximately the center in the front-rear and left-right directions. In this embodiment, the insertion hole 62 is circular in top view.

[0101] 9, the flange portion 60 is located between the two front joining portions 58 in the front-rear direction. That is, the front joining portions 58 are located in front of and behind the flange portion 60.

[0102] 2, a headrest frame 64 is coupled to the rear surface of the movable frame 12. The headrest frame 64 is a frame for supporting or configuring the headrest 6, and is provided to support the headrest 6 in this embodiment.

[0103] 2 and 3A, the headrest frame 64 includes a pair of left and right vertical portions 65 spaced apart from each other, and horizontal portions 66 extending left and right to connect the upper edges of the vertical portions 65. The vertical portions 65 are each joined at their lower ends to the movable member bent portions 43. This fixes the headrest frame 64 to the movable side member 38.

[0104] Each vertical portion 65 has a headrest side portion 68 and a headrest shoulder portion 69. The headrest side portion 68 is connected at its end to the movable side member 38 and extends upward. The headrest side portion 68 may be connected (welded) to the movable member bent portion 43. The headrest shoulder portion 69 is connected at its end to the upper end of the headrest side portion 68. The headrest shoulder portion 69 extends inclined upward from the upper end of the headrest side portion 68 toward the inside of the seat, bends upward at a headrest bent portion 70, and continues extending upward.

[0105] In this embodiment, the headrest frame 64 is made of a bent pipe material, but is not limited to this and may be made of one or more sheet metal members.

[0106] The headrest 6 is fixed to the upper part of the headrest frame 64. The headrest 6 may be composed of a plate-like member (not shown) facing the front-rear direction, a pad member (not shown) provided on the front surface of the plate-like member, and a skin material (not shown) covering the front surface of the pad member. The rear surface of the plate-like member may be fixed to the headrest frame 64, thereby connecting the headrest 6 to the upper front surface of the headrest frame 64.

[0107] 2, the seat back frame 10 is provided with a pressure receiving member 72 that supports the weight of a seated occupant. The pressure receiving member 72 includes a lower pressure receiving member 73 provided on the base frame 11 and an upper pressure receiving member 74 provided on the movable frame 12. The lower pressure receiving member 73 is supported by the base frame 11, and the upper pressure receiving member 74 is mainly supported by the movable frame 12. The upper pressure receiving member 74 is disposed above the lower pressure receiving member 73 in a front view.

[0108] <Lower Pressure-Receiving Member> The lower pressure-receiving member 73 is disposed behind the lower half of the back of the seated occupant and supports the weight of the lower half of the back of the seated occupant. As shown in Fig. 2, the lower pressure-receiving member 73 is made of a flat plate-like member. The lower pressure-receiving member 73 may be made of a resin plate-like member, or may be made of a metal plate material or the like.

[0109] As shown in Figure 3(A), the lower pressure-receiving member 73 includes a lower main portion 76 having a front surface facing the front-rear direction, and a pair of left and right lower portions 77 provided on the left and right edges of the lower main portion 76. The lower main portion 76 has a rectangular shape extending in the up-down direction in a front view. The lower portions 77 are each connected to the edge of the lower main portion 76 on the outer side of the seat. The lower portions 77 have a rectangular shape with a triangular notch cut out at the upper end on the outer side of the seat.

[0110] 2 and 3A, the lower pressure-receiving member 73 is disposed between the left base side member 14 and the right base side member 14. The lower pressure-receiving member 73 is supported by the left base side member 14 and the right base side member 14 via a lower installation member 79.

[0111] The lower installation member 79 is made of a bent metal rod-shaped member (a round bar in this embodiment). The lower installation member 79 may also be made of a metal pipe material.

[0112] As shown in FIG. 9 , the lower installation member 79 has a pair of left and right hooking portions 80 and a connecting portion 81 extending in the left-right direction and connecting the lower ends of the hooking portions 80. The hooking portion 80 has an outer vertical portion 80A extending upward from the outer end of the connecting portion 81, a lower horizontal portion 80B extending from the outer vertical portion 80A toward the inside of the seat, an inner vertical portion 80C extending upward from the inner end of the lower horizontal portion 80B, and an upper horizontal portion 80D extending outward from the inner vertical portion 80C. The outer ends of the upper horizontal portions 80D each have a downward extension toward the outside of the seat, a bent end, and a downwardly extending retaining portion 80E. As shown in FIG. 2 , the connecting portions 81 are provided with hooks 81A that are hooked and fixed in appropriate positions on the base lower member 16. This connects the connecting portions 81 to the base lower member 16 (see FIG. 2 ).

[0113] 9 , the retaining portion 80E of the lower installation member 79 is inserted into the insertion hole 62 of the flange portion 60. That is, one end of the lower installation member 79 is prevented from falling out of the insertion hole 62, and one end of the lower installation member 79 is coupled to the flange portion 60. This allows the lower installation member 79 to be coupled to the pivot bracket 40 in a simple manner. The flange portion 60 and the insertion hole 62 provided in the flange portion 60 form an attachment portion 82 for attaching one end of the lower installation member 79.

[0114] In this way, the member for connecting the movable frame 12 and the base frame 11 and the member for attaching the lower installation member 79 to the base frame 11 can be constructed from a single pivot bracket 40 (attachment member), so the number of parts in the seat 1 can be reduced without having to provide a separate member for joining the lower installation member 79 to the base frame 11.

[0115] Furthermore, one end of the lower installation member 79 is connected to the flange portion 60 of the pivot bracket 40. Therefore, the rigidity of the portion of the pivot bracket 40 to which the lower installation member 79 is attached can be increased.

[0116] Furthermore, the front connecting portions 58 are provided respectively in front and behind the mounting portion 82. Therefore, compared to when the front connecting portions 58 are provided only on one side, either the front or rear, the pivot bracket 40 can be more firmly connected to the front panel 20, and the lower installation member 79 can be stably supported by the front panel 20.

[0117] A plurality of hooks (not shown) are provided on the rear surface of the lower pressure-receiving member 73 and are hooked onto the lower installation member 79. The lower pressure-receiving member 73 is connected to the lower installation member 79 by the hooks being hooked onto the lower installation member 79. As a result, the lower pressure-receiving member 73 is connected to each of the base side members 14 via the lower installation member 79.

[0118] <Upper Pressure-Receiving Member> The upper pressure-receiving member 74 is disposed behind the upper part of the back of the seated occupant and supports the load on the upper part of the back of the seated occupant. As shown in Fig. 2, the upper pressure-receiving member 74 is made of a plate-like member, similar to the lower pressure-receiving member 73. The upper pressure-receiving member 74 may be made of a resin plate-like member, or may be made of a metal plate material or the like.

[0119] As shown in Fig. 3A, the upper pressure-receiving member 74 includes a flat upper main portion 84 having a front surface facing the front-rear direction, and a pair of left and right upper portions 85 provided on the left and right edges of the upper main portion 84. As shown in Fig. 2, the upper portions 85 are each flat, connected to the edge portions of the upper main portion 84 on the outer side of the seat (i.e., the left and right side edges), and extend forward toward the outside of the seat. This allows the upper pressure-receiving member 74 to be shaped to fit along the back of the seated occupant.

[0120] As shown in FIGS. 2 and 3A, each of the movable side members 38 is provided with an upper installation member 87 for connecting the upper pressure-receiving member 74 to the movable side member 38 .

[0121] 9, the upper installation member 87 is composed of a pair of left and right side frames 88. The side frames 88 are composed of bent metal rod-shaped members (round bars in this embodiment). The side frames 88 may also be composed of metal pipe material.

[0122] The side frame 88 has an upper vertical portion 88A extending in the vertical direction, an inclined portion 88B sloping downward from the lower end of the upper vertical portion 88A toward the inside of the seat, a lower vertical portion 88C extending downward from the lower end of the inclined portion 88B, and a lower horizontal portion 88D extending from the lower end of the lower vertical portion 88C toward the outside of the seat.

[0123] Each movable side member 38 is provided with a mounting bracket 90 for mounting the upper installation member 87 .

[0124] The mounting bracket 90 is fixed to the center of the movable side member 38, more specifically, to the upper part of the movable member side portion 41. In this embodiment, the mounting bracket 90 is made of a bent sheet metal member, and is fixed to the upper part of the movable member side portion 41 by welding.

[0125] The mounting bracket 90 has a flange portion 91, similar to the lower installation member 79. The flange portion 91 is plate-shaped with a main surface facing in the vertical direction. The flange portion 91 has a mounting hole 92 that penetrates in the vertical direction. The upper end of the upper vertical portion 88A of the upper installation member 87 is inserted into the mounting hole 92. In this way, the upper installation member 87 is attached to the movable side member 38 via the mounting bracket 90. In other words, the mounting bracket 90 forms a part that connects the upper installation member 87 and the movable frame 12.

[0126] The upper edge of the upper vertical portion 88A is provided with a horizontally bent portion 93 to prevent the upper vertical portion 88A from slipping out of the mounting hole 92. As a result, the side frames 88 are each coupled to the movable side members 38, and the upper installation member 87 is coupled to and supported by the movable side member 38.

[0127] A plurality of hooks (not shown) are provided on the rear surface of the upper pressure receiving member 74 and are hooked onto the upper installation member 87. By hooking the hooks onto the upper installation member 87, the upper pressure receiving member 74 is connected to the front surface of the upper installation member 87 and is connected to and supported by the front side of the upper installation member 87. The upper pressure receiving member 74 is connected to each of the movable side members 38 via the upper installation members 87.

[0128] In this embodiment, as shown in FIG. 9 , a cylindrical tubular member 94 (also referred to as a collar) is provided on the lower installation member 79. The upper installation member 87 is inserted into the tubular member 94 together with the lower installation member 79 at its lower edge (lower horizontal portion 88D) and coupled to the tubular member 94. This allows the upper pressure-receiving member 74 to be tiltable in the front-rear direction relative to the lower installation member 79. That is, the tubular member 94 functions as a connecting portion between the lower installation member 79 and the upper pressure-receiving member 74. To facilitate assembly of the tubular member 94, a slit (not shown) extending in the left-right direction may be provided on the rear surface of the tubular member 94. The tubular member 94 may be made of metal, resin, or the like.

[0129] 8 , when the movable frame 12 rotates about the rotation axis X and tilts forward, a load that tends to tilt the upper pressure-receiving member 74 forward is applied via the upper installation member 87. Because the upper pressure-receiving member 74 is tiltably connected to the lower installation member 79 via the tubular member 94, the upper pressure-receiving member 74 rotates in response to the tilt of the movable frame 12. Therefore, by connecting the lower installation member 79 and the upper installation member 87 with the tubular member 94, the upper pressure-receiving member 74 can be stably supported by the seat back frame 10 while reducing the effect of tilting of the movable frame 12.

[0130] One end of the lower installation member 79 is inserted into the insertion hole 62 of the flange portion 60 to prevent it from coming off. Therefore, the lower installation member 79 is supported by the flange portion 60 so as to be slidable in the direction of penetration of the insertion hole 62. Therefore, when the upper installation member 87 is pulled upward, the lower installation member 79 can move following it.

[0131] 3A, the left upper portion 85 of the upper pressure receiving member 74 and the left movable member shoulder portion 42 of the movable side member 38 are arranged in positions that are aligned in the vertical direction when viewed from the front. Similarly, the right upper portion 85 of the upper pressure receiving member 74 and the right movable member shoulder portion 42 of the movable side member 38 are arranged in positions that are aligned in the vertical direction when viewed from the front.

[0132] As a result, the upper main portion 84 is positioned at the rear center of the back of the seated person, and the upper side portions 85 are positioned along the left and right sides of the back of the seated person. In other words, the upper pressure-receiving member 74 can be positioned so as to fit along the back of the seated person.

[0133] In this embodiment, as shown in Figure 3A, the lower edge of the upper portion 85 is provided with a notch 95 cut upward. This allows the worker assembling the seat 1 to see the rotating bracket 40 from the front when the movable portion 9 is in the upright position, thereby improving the ease of assembly of the seat 1.

[0134] In Figure 11, a first imaginary plane S1 that runs along the front surface of the lower main part 76 is indicated by a two-dot chain line. As shown in Figure 11, the tubular member 94 is located rearward of the first imaginary plane S1. That is, when viewed in a direction along the front surface of the lower main part 76, the tubular member 94 is disposed rearward of the lower main part 76, and the lower installation member 79 and the upper pressure-receiving member 74 are connected behind the lower main part 76. This prevents a seated occupant from feeling a foreign body sensation due to the connection between the lower installation member 79 and the upper pressure-receiving member 74.

[0135] 11 , a second imaginary plane S2 that runs along the front surface of the upper main portion 84 is indicated by a dashed line. As shown in FIG. 11 , the tubular member 94 is located rearward of the second imaginary plane S2. That is, when viewed in a direction along the front surface of the upper main portion 84, the tubular member 94 is disposed rearward of the upper main portion 84, and the lower installation member 79 and the upper pressure-receiving member 74 are connected behind the upper main portion 84. This prevents a seated occupant from feeling a foreign body sensation due to the connection between the lower installation member 79 and the upper pressure-receiving member 74.

[0136] The lower pressure receiving member 73 may not be connected to the movable frame 12, but may be connected only to the base frame 11 and supported only by the base frame 11. The upper pressure receiving member 74 may not be connected to the base frame 11, but may be connected only to the movable frame 12 and supported only by the movable frame 12. This allows the lower pressure receiving member 73 to rotate relative to the movable frame 12, and the upper pressure receiving member 74 to rotate relative to the base frame 11. This makes it possible to configure a pressure receiving member 72 that can further reduce the effects of tilting of the movable frame 12.

[0137] 2 and 8, the seat back 5 includes an actuator 98 for tilting (rotating) the movable portion 9. The actuator 98 is provided between the base frame 11 and the movable frame 12.

[0138] As shown in FIG. 8 , the actuator 98 includes a motor 98A, a lead screw 98B, and a gearbox 98C that converts the rotation of the motor 98A into linear motion of the lead screw 98B. The gearbox 98C includes a gear and a housing that accommodates the gear. The housing has a through-hole that allows the lead screw 98B to pass through. When the output shaft of the motor 98A rotates, one end of the lead screw 98B protrudes or retracts, moving toward or away from the housing. In this embodiment, the axial direction of the output shaft of the motor 98A and the axial direction of the lead screw 98B are configured to be perpendicular to each other.

[0139] A connecting member 100 is fixed to the movable upper member 39, and the lead screw 98B is connected at its end to the connecting member 100 so as to be rotatable about an axis Y extending in the left-right direction. As a result, the actuator 98 is connected to the movable upper member 39 at the end (the upper end in FIG. 2) of the lead screw 98B so as to be rotatable about the axis Y extending in the left-right direction.

[0140] Since the connecting member 100 is fixed to the movable upper member 39, the actuator 98 is connected to a portion between the two movable member bending portions 43 of the movable frame 12. In addition, as shown in FIG. 3A, the connection portion between the actuator 98 and the movable frame 12 is located between the headrest bending portions 70 in a front view.

[0141] 8, the gearbox 98C is connected to a first connecting bracket 102 so as to be rotatable about an axis Z extending in the left-right direction. The first connecting bracket 102 is fixed to a second connecting bracket 103, and the second connecting bracket 103 is fixed to the base upper member 15. In this way, the gearbox 98C is connected to the base upper member 15 so as to be rotatable about the axis Z extending in the left-right direction.

[0142] As a result, one end of the actuator 98 (corresponding to an end of the gearbox 98C) is rotatably connected to the base upper member 15 about the axis Z extending in the left-right direction. The other end of the actuator 98 (corresponding to the lead screw 98B) is rotatably connected to the movable upper member 39 about the axis Y extending in the left-right direction. Therefore, the movable side member 38 and the corresponding base side member 14, one end of the actuator 98 and the base upper member 15, and the other end of the actuator 98 and the movable upper member 39 are rotatably connected to each other about the axes Y and Z extending in the left-right direction. As a result, the actuator 98 connects the base upper member 15 and the movable upper member 39, and by driving the actuator 98, the movable upper member 39 can be rotated to move toward or away from the base upper member 15.

[0143] In the present embodiment, the actuator 98 is configured to move the movable upper member 39 toward and away from the base upper member 15, but the present invention is not limited to this. Specifically, the actuator 98 may be configured to be connected to the upper part of the base frame 11 other than the base upper member 15 (more specifically, the part above the rotation axis X) and the movable upper member 39, and may be configured to move the movable upper member 39 toward and away from the upper part of the base frame 11.

[0144] When the actuator 98 is driven to move the end of the lead screw 98B in a direction protruding from the gear box 98C, the movable upper member 39 is pushed forward relative to the base upper member 15. As a result, the movable frame 12 rotates around the rotation axis X relative to the base frame 11 in a direction tilting forward relative to the base frame 11.

[0145] When the actuator 98 is driven to move the end of the lead screw 98B in a direction retracting from the gear box 98C, the movable upper member 39 is pulled toward the base upper member 15. As a result, the movable frame 12 rotates around the rotation axis X relative to the base frame 11 in a direction tilting backward relative to the base frame 11.

[0146] In this way, the actuator 98 tilts the movable frame 12 relative to the base frame 11, displacing (specifically, rotating) the movable portion 9 between the forward tilt position and the upright position.

[0147] 2 and 8, at least one of the base frame 11 and the movable frame 12 is provided with a receiving recess 105 that receives at least a portion of the actuator 98. In this embodiment, the receiving recess 105 is provided on the front surface of the base upper member 15, in the center in the left-right direction. As shown in FIG. 2, the receiving recess 105 is formed as a recess that is recessed rearward (in the direction away from the movable upper member 39) on the front surface of the base upper member 15. At least a portion of the actuator 98 (for example, a portion of the motor 98A or the lead screw 98B) is received inside the receiving recess 105 in a side view (see FIG. 4).

[0148] The receiving recess 105 is provided on the front surface of the base upper member 15 at a position where the front panel 20 and the rear panel 21 face each other in the front-rear direction and overlap each other in the front-rear direction.

[0149] As shown in Figure 8, the gearbox 98C is journaled to a first connecting bracket 102. The second connecting bracket 103 is U-shaped and opens rearward. The second connecting bracket 103 is joined (welded in this embodiment) to the top surface and front surface (bottom surface of the receiving recess 105) of the portion of the base upper member 15 where the receiving recess 105 is provided. The first connecting bracket 102 is connected to the front surface of the second connecting bracket 103.

[0150] The second connecting bracket 103 is connected to the front panel 20 and the rear panel 21 of the seat back frame 10 at a position where they face each other. As a result, the actuator 98 is supported via the second connecting bracket 103 at a position where the front panel 20 and the rear panel 21 of the seat back frame 10 face each other. As a result, the actuator 98 can be supported on a portion of the base frame 11 that is highly rigid and less likely to deform.

[0151] Since the connecting member 100 is fixed to the movable upper member 39, the actuator 98 is connected to the movable upper member 39, i.e., the portion between the two movable member bent portions 43 of the movable frame 12. Therefore, the connection portion between the actuator 98 and the movable frame 12 can be located closer to the center of the seat in the left-right direction. This allows the actuator 98 to rotate (tilt) the movable frame 12 more stably than when, for example, the actuator 98 is connected to the movable side member 38.

[0152] However, more specifically, the second connecting bracket 103 is provided at a position offset to either the left or right side of the receiving recess 105. Therefore, the lead screw 98B is disposed at a position offset to either the left or right side (the vehicle exterior side in this embodiment) of the receiving recess 105. This arrangement ensures a sufficient space to accommodate the motor 98A between the lead screw 98B and the wall surface that defines the edge of the receiving recess 105 on the other left or right side (the vehicle interior side in this embodiment).

[0153] <Seat belt guide and seat belt retractor> As shown in Figure 1, the seat 1 is provided with a seat belt device 200 for ensuring the safety of the seated occupant, which includes a seat belt 202 with a tongue 201, a buckle 203 into which the tongue 201 is inserted, a seat belt retractor 204 (see Figure 2) that retracts the seat belt 202, and a seat belt guide 205 into which the seat belt 202 is inserted.

[0154] 12, the seat belt retractor 204 has a device main body 207 that automatically retracts and stores the seat belt 202, and a retainer 208 that supports the device main body 207. The retainer 208 is made of a plate-shaped sheet metal member, and the device main body 207 is fixed to one side of the retainer 208.

[0155] The base frame 11 is provided with a device mounting bracket 210 for mounting the seat belt retractor 204. The device mounting bracket 210 is fixed to an upper part of the base frame 11 on the outer side of the vehicle.

[0156] The device mounting bracket 210 includes a bracket fixing portion 211 and a bracket extending portion 212. The bracket fixing portion 211 is disposed so as to cover the seat outer surface of the base side member 14 on the vehicle exterior side and the vehicle exterior edge of the upper surface of the base upper member 15. The bracket fixing portion 211 is fixed to the base side member 14 and the base upper member 15 by welding.

[0157] The bracket extending portion 212 is plate-shaped and has a surface facing the front-rear direction. The bracket extending portion 212 extends downward from the bracket fixing portion 211 at an angle toward the inside of the seat. The bracket fixing portion 211 has a hook hole 214 that penetrates through the thickness direction at its extending end. A bead (hereinafter referred to as the upper bead 216) is provided in approximately the center of the bracket fixing portion 211 in the extending direction.

[0158] The retainer 208 overlaps the bracket fixing portion 211 and the upper middle member 17U from the rear side and is positioned so as to straddle both. The retainer 208 has a surface facing the front-to-rear direction and extends at an angle downward toward the inside of the seat. A hook 218 (also referred to as a hook portion) that is hooked into the hook hole 214 is provided at the upper end of the retainer 208. The hook 218 may be configured as a protrusion that protrudes toward the bracket fixing portion 211.

[0159] A through-hole (hereinafter, panel-side mounting hole 222) that penetrates in the thickness direction is provided in a portion of the upper middle member 17U that overlaps with the retainer 208 (hereinafter, middle member connecting portion 220). The middle member connecting portion 220 is formed by overlapping the front panel 20 and the rear panel 21, and the panel-side mounting hole 222 penetrates the front panel 20 and the rear panel 21.

[0160] The retainer 208 is provided with an apparatus-side mounting hole 224 that passes through at a position that aligns with the panel-side mounting hole 222. A nut 227 is fitted onto a bolt 226 that passes through the panel-side mounting hole 222 and the apparatus-side mounting hole 224, thereby connecting the lower end portion of the retainer 208 and the middle member connecting portion 220.

[0161] The bolt 226 may be inserted from the rear of the upper middle member 17U, and the nut 227 may be tightened from the front, thereby fastening and fixing the lower end portion of the retainer 208 and the middle member connecting portion 220 together.

[0162] A bead (hereinafter referred to as the lower bead 230) is provided in the lower portion of the panel-side mounting hole 222 of the upper middle member 17U. As shown in Figure 13, the lower bead 230 is formed by overlapping a bead formed on the front panel 20 (hereinafter referred to as the front lower bead 230F) and a bead formed on the rear panel 21 (hereinafter referred to as the rear lower bead 230R).

[0163] The upper bead 216, the front lower bead 230F, and the rear lower bead 230R each function as a rearward movement promoting portion that moves the seat belt retractor 204 rearward when an excessive load is input from the occupant side.

[0164] The upper bead 216 may be configured to be more easily deformed (more fragile) than either the front lower bead 230F or the rear lower bead 230R, or may be configured to be less easily deformed (more rigid). The upper bead 216 may be configured by a portion of the device mounting bracket 210 that is bent in a wavy or convex shape. Similarly, the front lower bead 230F may be configured by a portion of the front panel 20 that is bent in a wavy or convex shape, and the rear lower bead 230R may be configured by a portion of the rear panel 21 that is bent in a wavy or convex shape.

[0165] 2, the seat back frame 10 is provided with a guide mounting bracket 232 for assembling the seat belt guide 205. The guide mounting bracket 232 is made of a bent sheet metal member. The guide mounting bracket 232 is disposed so as to cover the bracket fixing portion 211 of the device mounting bracket 210, and is fixed to the bracket fixing portion 211 of the device mounting bracket 210 (and / or the base frame 11) by welding.

[0166] 14 , when the movable section 9 is in the upright position (when the movable upper member 39 is at the rearmost position), the movable member shoulder 42 is located behind the pivot bracket 40 in a top view. At least a portion of the movable member shoulder 42 is located in front of the mounting bracket 90 (the portion connecting the upper installation member 87 and the movable frame 12). However, the entire movable member shoulder 42 may be located in front of the mounting bracket 90. At least a portion of the mounting bracket 90 is located in front of the actuator 98, and preferably the entire mounting bracket 90 is located in front of the actuator 98.

[0167] By configuring in this way, the standing position can be set to an appropriate position where the movable part 9 does not tilt too far forward or backward and a large occupant can sit in a relaxed manner.

[0168] Furthermore, since the mounting bracket 90 is located in front of the actuator 98 and the upper pressure-receiving member 74 is supported on the front side of the upper installation member 87, the upper pressure-receiving member 74 is disposed in front of the actuator 98. This prevents the actuator 98 from giving a foreign body sensation to the seat occupant.

[0169] As shown in Figures 15 and 16, when the movable part 9 is in a forward tilted position (when the movable upper member 39 is positioned at the forwardmost position), the part (flange part 60) where the lower installation member 79 and the seat back frame 10 are connected is located rearward of the front end of the actuator 98.

[0170] With this configuration, the forward tilt position can be set to an appropriate position that can support the back of a relatively small seated occupant.

[0171] 2, when the movable section 9 is in the upright position, the upper main section 84 and the left and right upper sections 85 of the upper pressure-receiving member 74 are each located above the rotation axis X (see also FIG. 4). As a result, by tilting the movable frame 12 forward, the upper pressure-receiving member 74 can be rotated from a position where its upper portion is tilted backward to a position where it protrudes forward and stands upright (see FIG. 16). Therefore, by rotating the movable frame 12, the upper pressure-receiving member 74 can be supported by the movable frame 12 so as to be able to support the back of a small-sized seated person.

[0172] 16 , whether the movable portion 9 is in the upright position or the forward tilted position, at least a portion of the actuator 98 is located behind the upper pressure-receiving member 74. In addition, at least a portion of the actuator 98 is located behind the headrest frame 64.

[0173] 4, when the movable portion 9 is in the upright position, the upper end of the seat belt retractor 204 is located below the upper end of the movable frame 12 and above the lower end of the movable frame 12. In addition, in the vertical direction, at least a portion of the seat belt retractor 204 is disposed between the upper edge and the lower edge of the movable frame 12. In other words, in the vertical direction, at least a portion of the seat belt retractor 204 is disposed at the same height as the movable frame 12.

[0174] 3A, the seat belt retractor 204 is provided at a position offset toward the vehicle exterior side from the center line of the seat 1. When the movable portion 9 is in the upright position, at least a part of the seat belt retractor 204 is located on the seat interior side of the movable side member 38 located on the vehicle exterior side in a front view. However, it is preferable that the left-right central part of the seat belt retractor 204 is located on the seat interior side of the movable side member 38 located on the vehicle exterior side in a front view, and it is more preferable that the seat outer end of the seat belt retractor 204 (i.e., the entire seat belt retractor 204) is located on the seat interior side of the movable side member 38 located on the vehicle exterior side in a front view.

[0175] Furthermore, when the movable part 9 is in the upright position, the lower end of the seat belt retractor 204 is located below the movable member bent part 43 in a front view. However, when the movable part 9 is in the upright position, it is preferable that the upper end of the seat belt retractor 204 (i.e., the entire seat belt retractor 204) is located below the movable member bent part 43 in a front view.

[0176] In addition, when the movable part 9 is in the upright position, the end of the seat belt retractor 204 on the inside of the seat is located outside the seat with respect to the connection position between the actuator 98 and the movable upper member 39. Furthermore, when the movable part 9 is in the upright position, it is preferable that the seat belt retractor 204 is located below the connection portion between the upper installation member 87 and the movable frame 12 (i.e., specifically, the left mounting bracket 90).

[0177] This arrangement allows the seat back to be configured compactly.

[0178] As shown in FIGS. 3B, 4, and 16, regardless of the position of the movable portion 9, the lower end of the seat belt retractor 204 is located above the rotation axis X in front and side views.

[0179] When the movable part 9 is in the upright position, the upper end of the seat belt retractor 204 is located above the upper pressure-receiving member 74 in a front view and a side view. In this embodiment, the lower end of the seat belt retractor 204 (i.e., the entire seat belt retractor 204) is located above the upper pressure-receiving member 74 in a front view and a side view.

[0180] With this arrangement, the seat belt retractor 204 can be installed at a position where it is less likely to be affected by the rotation of the movable frame 12.

[0181] 4, at least a portion of the seat belt retractor 204 is located behind the front panel 20. Therefore, compared to when the seat belt retractor 204 is located in front of the front panel 20, it is possible to prevent the seat occupant from feeling a foreign body sensation.

[0182] 14 , at least a portion of the actuator 98 overlaps the guide mounting bracket 232 in a side view, and is provided at the same position in the front-to-rear direction. The seat belt retractor 204 also overlaps the guide mounting bracket 232 in a side view, and is provided at the same position in the front-to-rear direction. This allows the actuator 98 to be arranged compactly. Furthermore, when the movable portion 9 is in the upright position, the headrest frame 64 is located forward of the rear end of the guide mounting bracket 232 in the front-to-rear direction. Furthermore, when the movable portion 9 is in the upright position, it is preferable that the rear end of the headrest frame 64 be located between the front and rear ends of the seat belt retractor 204.

[0183] <Seat Manufacturing Method> Next, a description will be given of a manufacturing method of the seat 1. The manufacturing method of the seat 1 includes a first step of manufacturing the base frame 11, a second step of rotatably assembling the movable frame 12 to the base frame 11, a third step of assembling the upper installation member 87 and the lower installation member 79 to the first installation member and the second installation member, respectively, a fourth step of assembling the first installation member and the second installation member, and a fifth step of connecting the actuator 98 to the movable frame 12 and the base frame 11. After the fifth step, the headrest 6, the padding member, and the upholstery material are sequentially assembled.

[0184] The first process includes a process of manufacturing the front panel 20 and the rear panel 21 by press working, and a process of joining the front panel 20 and the rear panel 21 at their peripheral edges to form the base frame 11. The front panel 20 and the rear panel 21 may be joined by welding, or may be joined by fastening with bolts and nuts.

[0185] The first step may include a step of inserting and fixing the stud bolt 52 into the first through-hole 53 of the front panel 20. This step may be performed before the step of joining the front panel 20 and the rear panel 21 together.

[0186] The first step may also include a step of fixing (in this embodiment, welding) the second connecting bracket 103 to the base upper member 15. This step may be performed after the front panel 20 and the rear panel 21 are joined together. In this step, the second connecting bracket 103 may be joined (welded) to the top and bottom surfaces of the base upper member 15.

[0187] The second step includes a step of fixing the connecting member 100 to the movable frame 12 by welding or the like, a step of fixing the headrest frame 64 to the movable frame 12, a step of rotatably coupling the movable frame 12 to the pivot bracket 40, and a step of fixing the pivot bracket 40 to the base frame 11. The step of fixing the headrest frame 64 to the movable frame 12 includes a step of coupling (by welding in this embodiment) the lower end of the vertical portion 65 to the movable member bent portion 43 of the movable frame 12. The step of rotatably coupling the movable frame 12 to the pivot bracket 40 includes a step of inserting a pin 49 into a through-hole 48 provided in the lower end of the movable side member 38 and rotatably coupling the lower end of the movable side frame to the bulging portion 45B of the pivot bracket 40.

[0188] The process of fixing the pivoting bracket 40 to the base frame 11 can include the process of inserting a stud bolt 52 provided in a first through-hole 53 of the front panel 20 into a front bolt hole 50A to position the pivoting bracket 40, and then inserting a bolt 56 into a rear bolt hole 50B and a second through-hole 54 of the pivoting bracket 40 and engaging a nut 57 to couple (in this embodiment, fasten) the pivoting bracket rear portion 46 and the front panel 20. This allows the worker to position the pivoting bracket 40 once, and then perform the work of coupling the pivoting bracket 40 to the base frame 11, thereby making the assembly process easier.

[0189] The process of fixing the pivot bracket 40 to the base frame 11 may also include a process of attaching nuts 55 to the stud bolts 52 to join the pivot bracket front portion 45 and the front panel 20 together.

[0190] The third step may include a step of connecting the hook provided on the rear surface of the upper pressure-receiving member 74 to the upper installation member 87, and a step of connecting the hook provided on the rear surface of the lower pressure-receiving member 73 to the lower installation member 79. In addition, the third step may include a step of connecting the upper installation member 87 and the lower installation member 79 with a tubular member 94.

[0191] The fourth step includes inserting the end of the upper installation member 87 from below into the mounting hole 92 provided in the flange portion 91 of the mounting bracket 90, and inserting the end of the lower installation member 79 from above into the insertion hole 62 provided in the flange portion 60 of the pivot bracket 40. In the step of inserting the end of the upper installation member 87 from below, the worker may insert the end of the upper installation member 87 above the position where it will be located after installation (also referred to as overstroking), and then perform the step of inserting the end of the lower installation member 79 from above into the insertion hole 62. This allows the lower installation member 79 to be installed after the upper installation member 87 is assembled, thereby improving the ease of assembly.

[0192] The fifth step includes a step of rotatably connecting the first connecting bracket 102 to the gearbox 98C, a step of fixing the first connecting bracket 102 to the second connecting bracket 103, and a step of rotatably connecting the end of the lead screw 98B to the connecting member 100. Through these three steps, the actuator 98 is connected to the base frame 11 and the movable frame 12.

[0193] After the fifth step, a sixth step may be included in which the seat belt retractor 204 is assembled to the seat back frame 10. The device body 207 of the seat belt retractor 204 is previously coupled to the retainer 208, and the device mounting bracket 210 and the guide mounting bracket 232 are each fixed to the base frame 11 by welding or the like after the first step.

[0194] The sixth step includes the steps of: after the hook 218 of the retainer 208 is hooked into the hook hole 214, an operator positions the retainer 208 so that the panel-side mounting hole 222 and the device-side mounting hole 224 are aligned; passing a bolt 226 through the panel-side mounting hole 222 and the device-side mounting hole 224; and fastening the retainer 208 to the upper middle member 17U (middle member connecting portion 220) by connecting a nut 227 to the bolt 226. By connecting the retainer 208 to the upper middle member 17U, the seat belt retractor 204 is assembled to the seat back frame 10.

[0195] The seat belt guide 205 may be assembled to the guide mounting bracket 232 when the headrest 6, the padding material, and the covering material are assembled in sequence, or the seat belt guide 205 may be assembled to the guide mounting bracket 232 after the padding material and the covering material are assembled in sequence.

[0196] Next, the effects of the sheet 1 will be described.

[0197] 2, the pressure-receiving member 72 that supports the weight of a seated occupant includes a lower pressure-receiving member 73 provided on the base frame 11 and an upper pressure-receiving member 74 provided on the movable frame 12. Therefore, stress is less likely to be generated inside the pressure-receiving member 72 than when the upper pressure-receiving member 74 and the lower pressure-receiving member 73 are configured as an integral unit, and the pressure-receiving member 72 is more likely to follow the tilting of the movable part 9.

[0198] In this embodiment, the upper installation member 87 is connected to the lower installation member 79 via a tubular member 94. Therefore, the upper pressure-receiving member 74 is connected to the lower installation member 79 so as to be tiltable in the front-to-rear direction. This allows the upper and lower parts of the upper pressure-receiving member 74 to be well supported by the movable frame 12, and also allows the upper pressure-receiving member 74 to well follow the tilt of the movable frame 12.

[0199] The base frame 11 (base upper member 15) is provided with a receiving recess 105 that receives at least a portion of the actuator 98. By providing the receiving recess 105 that is recessed rearward in the base upper member 15 in this manner, a space for accommodating a functional component can be formed within the receiving recess 105. Furthermore, the actuator 98 and the base frame 11 are arranged so as to overlap in a side view. This allows the actuator 98 to be arranged compactly (i.e., so that the thickness of the upper part of the seat back frame 10 is reduced).

[0200] The actuator 98 is disposed between the base frame 11 and the movable frame 12. Therefore, by forming the receiving recess 105 so as to be recessed rearward on the front surface of the base upper member 15, the actuator 98 can be easily accommodated in the receiving recess 105.

[0201] Furthermore, the headrest frame 64 is coupled to the rear surface of the movable frame 12 and is supported by the movable frame 12. Therefore, the connecting portion of the headrest frame 64 to the movable frame 12 does not protrude forward beyond the movable frame 12. Therefore, the headrest frame 64 can be connected to the movable frame 12 while preventing the seated occupant from feeling a foreign body sensation.

[0202] The movable frame 12 is connected to the front panel 20 via the pivot bracket 40, and the airbag module 24 is connected to the rear panel 21. With this configuration, the movable frame 12 and the airbag module 24 can be more easily disposed at a greater distance than when the movable frame 12 and the airbag module 24 are provided on the same panel. This reduces the influence of rotation of the movable frame 12 on the airbag module 24. Furthermore, because the deployment of the airbag 25 is prevented from being hindered by the movable frame 12, the airbag 25 can be deployed smoothly, thereby improving the safety of the seat 1.

[0203] In this embodiment, the pivot bracket 40 is located above the joint portion (rear joint portion 32) of the rear panel 21 with the airbag module 24. As a result, the joint portion (front joint portion 58) of the front panel 20 with the movable frame 12 is located above the joint portion (rear joint portion 32) of the rear panel 21 with the airbag module 24. Therefore, the movable frame 12 and the airbag module 24 are joined at positions spaced apart in the up-down direction of the base frame 11, preventing the deployment of the airbag 25 from being hindered by the movable frame 12.

[0204] Furthermore, whether the movable portion 9 is in the forward tilt position or the upright position, at least a portion of the actuator 98 is located behind the upper pressure-receiving member 74. Therefore, compared to when the entire actuator 98 is located in front of the upper pressure-receiving member 74, it is possible to prevent the actuator 98 from giving a foreign body sensation to the seat occupant.

[0205] Furthermore, the upper end of the seat belt retractor 204 is located below the upper end of the movable frame 12 and above the lower end of the movable frame 12, and at least a portion of the seat belt retractor 204 is disposed at the same height in the vertical direction as the movable frame 12. Therefore, the seat back 5 (i.e., the seat 1) can be configured to be more compact in the vertical direction than when the entire seat belt retractor 204 is disposed above the movable frame 12.

[0206] Although the description of the specific embodiment has been completed above, the present invention is not limited to the above embodiment and can be widely modified and implemented.

[0207] For example, in the above embodiment, an example is described in which the pressure receiving member 72 is configured by the upper pressure receiving member 74 and the lower pressure receiving member 73, but the pressure receiving member 72 may be configured by two or more plate members arranged approximately parallel to the backrest surface 5S. In this case, each of the plate members may be joined at both ends to either the seat back frame 10 or the movable frame 12, and may be rotatably connected to an adjacent plate member around a rotation axis X extending in the left-right direction.

[0208] In the above embodiment, the receiving recess 105 is provided in the base frame 11, but it may also be provided in the movable frame 12. In that case, the receiving recess 105 is formed so as to be recessed forward in the movable upper frame, and at least a portion of the lead screw 98B is housed in the receiving recess 105. Alternatively, the receiving recess 105 may be provided in each of the base frame 11 and the movable frame 12. In the above embodiment, an example has been described in which the actuator 98 is housed in the receiving recess 105, but it is also possible to house various functional components other than the actuator 98 in the receiving recess 105.

[0209] In the above embodiment, an example in which the present invention is applied to a vehicle seat has been described, but the seat 1 according to the present invention can also be applied to various seats for aircraft, trains, etc. Furthermore, not all of the components of the seat 1 shown in the above embodiment are necessarily required, and can be selected as appropriate.

[0210] DESCRIPTION OF SYMBOLS 1: Seat (an example of a vehicle seat) 5: Seat back 10: Seat back frame 11: Base frame 12: Movable frame 20: Front panel (an example of a front frame) 21: Rear panel (an example of a rear frame) 38: Movable side member 39: Movable upper member 41: Movable member side portion (an example of a side portion) 42: Movable member shoulder portion (an example of a shoulder portion) 43: Movable member bent portion (an example of a bent portion) 74: Upper pressure receiving member 87: Upper installation member 98: Actuator 202: Seat belt 204: Seat belt retractor X: Rotation axis Z: Axis

Claims

1. A vehicle seat having a seat back frame and a seat belt retractor supported by the seat back frame, the seat back frame including a base frame and a movable frame connected to the base frame so as to be tiltable in the fore-and-aft direction, the upper end of the seat belt retractor being located below the upper end of the movable frame and above the lower end of the movable frame.

2. The vehicle seat according to claim 1, wherein the movable frame has a pair of left and right movable side members and a movable upper member extending in the left-right direction and connecting upper edges of the movable side members, the seat belt retractor is disposed in a position biased toward the movable side member on one side, and at least a portion of the seat belt retractor is located more inward of the seat than the movable side member on one side.

3. The vehicle seat according to claim 2, wherein a central portion of the seat belt retractor is disposed on an inner side of the movable side member on one side of the seat.

4. The vehicle seat according to claim 3, wherein the entirety of the seat belt retractor is positioned on the inner side of the seat relative to the movable side member on one side.

5. The vehicle seat according to claim 1, wherein the movable frame is connected to the base frame so as to be rotatable about a rotation shaft extending in the left-right direction, and the lower end of the seat belt retractor is located above the rotation shaft.

6. A vehicle seat as described in claim 1, wherein the movable frame is provided with a pressure-receiving member that supports the weight of a seated occupant, and when the upper end of the movable frame is in the rearmost position, the upper end of the seat belt retractor is located above the pressure-receiving member.

7. The vehicle seat according to claim 6, wherein when the upper end of said movable frame is positioned at the rearmost position, the lower end of said seat belt retractor is positioned above said pressure-receiving member.

8. The vehicle seat described in claim 1, wherein the movable frame has a pair of left and right movable side members and a movable upper member extending in the left-right direction and connecting the upper edges of the movable side members, each of the movable side members being rotatably connected to the base frame and having an upwardly extending side portion and a shoulder portion extending from the upper end of the side portion at an angle upward toward the inside of the seat and bending upward at a bent portion before extending further upward, and when the upper end of the movable frame is positioned at the rearmost position, the lower end of the seat belt retractor is positioned below the bent portion.

9. A vehicle seat as described in claim 1, further comprising an actuator for tilting the movable frame relative to the base frame, the movable frame comprising a pair of left and right movable side members and a movable upper member extending in the left-right direction and connecting upper edges of the movable side members, the actuator being coupled to the movable upper member and the base frame, and an end of the seat belt retractor on the inner side of the seat being positioned outside the seat relative to a connection position between the actuator and the movable upper member.

10. A vehicle seat as described in claim 1, wherein the movable frame is provided with a pressure-receiving member that supports the back of a seated occupant, the pressure-receiving member is connected to the movable frame via an erection member, and the upper end of the seat belt retractor is positioned below the connection between the erection member and the movable frame.

11. The vehicle seat according to claim 1, wherein the base frame comprises a front frame that receives the load of an occupant, and a rear frame that is disposed opposite the front frame and connected to the front frame, and at least a portion of the seat belt retractor is positioned rearward of the front frame.

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