Vehicular seat

Abstract

To provide a vehicular seat that comprises a seat back whose upper part can be tilted with respect to a lower part, which enables an airbag to sufficiently expand.SOLUTION: In a vehicular seat 1, a seat back frame 10 constituting a framework of a seat back 5 includes a base frame 11, and a movable frame 12 turnably joined to the base frame. An airbag module 24 is provided on the base frame. The base frame has a front member 20 that receives a load of an occupant and a rear member 21 that is joined to a front member to form a closed cross section structure P in cooperation. The movable frame is joined to the front member and the airbag module is joined to the rear member.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat in which the upper part is tiltable in the front-rear direction with respect to the lower part of the seat back frame.

Background Art

[0002] Patent Document 1 discloses a vehicle seat having a seat back frame composed of a front frame and a rear frame. The front frame is disposed at a position for receiving the load of an occupant, and the rear frame is spaced apart and disposed at a position facing the front frame. The peripheral edge of the front frame and the peripheral edge of the rear frame form an overlapping portion that is at least partially overlapped, and are fixedly joined at a position avoiding the side receiving the occupant's load. Thereby, the seat back frame has a hollow closed cross-sectional structure. A side airbag unit is joined to the side of the front frame.

[0003] Patent Document 2 discloses a vehicle seat including a seat back frame and a movable frame tiltably connected to the seat back frame. The seat back frame of Patent Document 2 has a first side frame having an open cross-sectional structure, a second side frame having a closed cross-sectional structure, and a reinforcing member for closing the open cross-sectional structure of the first side frame.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In order to enhance both the comfort and safety of a vehicle seat, it may be considered to provide a movable frame and an airbag module on a seat back frame. In this case, it is required to arrange the airbag module so that the deployment of the airbag is not hindered by the movable frame.

[0006] In view of the above background, an object of the present invention is to provide a vehicle seat having a seat back that can tilt the upper part relative to the lower part and that can deploy an airbag favorably.

Means for Solving the Problems

[0007] In order to solve the above problems, an aspect of the present invention is a vehicle seat (1), wherein a seat back frame (10) constituting the skeleton of a seat back (5) has a base frame (11) and a movable frame (12) rotatably coupled to the base frame. An airbag module (24) is provided on the base frame. The base frame has a front member (20) that receives the load of an occupant and a rear member (21) that is coupled to the front member and cooperates to form a closed cross-sectional structure (P). The movable frame is coupled to the front member, and the airbag module is coupled to the rear member.

[0008] According to this aspect, compared with the case where the movable frame and the airbag module are provided on the same member, the movable frame and the airbag module are more likely to be spaced apart. Therefore, it is possible to provide a vehicle seat with enhanced safety that can deploy an airbag favorably.

[0009] In the above aspect, preferably, the movable frame is coupled at a front coupling portion (58) of the front member, the airbag module is coupled at a rear coupling portion (32) of the rear member, and the front coupling portion is located above the rear coupling portion.

[0010] According to this aspect, since the movable frame and the airbag module are coupled at positions separated in the vertical direction, it is difficult for the deployment of the airbag to be inhibited by the movable frame.

[0011] In the above aspect, preferably, the movable frame is coupled to the front coupling portion via a bracket (40), and the bracket is located above the rear coupling portion.

[0012] According to this aspect, since the movable frame and the airbag module are arranged at positions separated in the vertical direction, it is difficult for the deployment of the airbag to be inhibited by the movable frame.

[0013] In the above aspect, preferably, the front coupling portion is provided in front of and behind the rear coupling portion, respectively.

[0014] According to this aspect, the movable frame can be firmly coupled to the front frame.

[0015] In the above aspect, preferably, the bracket has a plate portion (45A) arranged along the inner side surface of the seat of the front member, and a bulging portion (45B) that bulges inside the seat and is spaced apart from the inner side surface of the seat of the front member, and the movable frame is rotatably coupled to the inner side surface of the seat of the bulging portion.

[0016] According to this aspect, the movable frame can be easily rotatably coupled to the bracket.

[0017] In the above aspect, preferably, the base frame includes a pair of base side members (14) extending in the vertical direction, a pressure receiving member (73) supported via a bridging member is provided between the base side members, and the bracket includes an attachment portion (82) for attaching one end of the bridging member.

[0018] According to this aspect, since there is no need to separately provide a member for coupling the erection member to the base frame, the number of parts of the vehicle seat can be reduced.

[0019] In the above aspect, preferably, the front coupling portions are respectively provided in front of and behind the mounting portion.

[0020] According to this aspect, the erection member can be firmly coupled to the front frame.

[0021] In the above aspect, preferably, the mounting portion has a plate-shaped flange portion (60) having a surface facing in the vertical direction, and a through hole (62) provided in the flange portion and through which the erection member is inserted.

[0022] According to this aspect, the erection member can be coupled to the bracket by a simple method.

[0023] In the above aspect, preferably, the airbag module constitutes an outer airbag module (24L) coupled to the outer side surface of the base frame on the vehicle exterior side, and an inner airbag module (24R) including a near-side airbag is further provided on the vehicle interior side of the base frame, and the bracket is located between the outer airbag module and the inner airbag module.

[0024] According to this aspect, the inner airbag module and the outer airbag module are arranged on the left and right sides of the movable frame. Thereby, since the inner airbag module and the outer airbag module can be arranged so as to be deployable at the side of the seated person, the safety of the vehicle seat can be enhanced.

Advantages of the Invention

[0025] One aspect of the present invention is a vehicle seat (1), wherein a seat back frame (10) constituting the skeleton of a seat back (5) has a base frame (11) and a movable frame (12) rotatably coupled to the base frame. An airbag module (24) is provided on the base frame. The base frame has a front member (20) for receiving the load of an occupant and a rear member (21) coupled to the front member and cooperating to form a closed cross-sectional structure (P). The movable frame is coupled to the front member, and the airbag module is coupled to the rear member.

[0026] According to this aspect, compared with the case where the movable frame and the airbag module are provided on the same member, the movable frame and the airbag module are more likely to be spaced apart. Therefore, it is possible to provide a vehicle seat with enhanced safety that can deploy the airbag well.

[0027] In the above aspect, preferably, the movable frame is coupled at a front coupling portion (58) of the front member, the airbag module is coupled at a rear coupling portion (32) of the rear member, and the front coupling portion is located above the rear coupling portion.

[0028] According to this aspect, since the movable frame and the airbag module are coupled at positions separated in the vertical direction, the deployment of the airbag is less likely to be obstructed by the movable frame.

[0029] In the above aspect, preferably, the movable frame is coupled to the front coupling portion via a bracket (40), and the bracket is located above the rear coupling portion.

[0030] According to this aspect, since the movable frame and the airbag module are arranged at positions separated in the vertical direction, the deployment of the airbag is less likely to be obstructed by the movable frame.

[0031] In the above aspect, preferably, the front coupling portion is provided in front of and behind the rear coupling portion, respectively.

[0032] According to this aspect, the movable frame can be firmly coupled to the front frame.

[0033] In the above aspect, preferably, the bracket has a plate portion (45A) arranged along the side surface inside the seat of the front member, and a bulging portion (45B) that bulges inside the seat and is spaced apart from the side surface inside the seat of the front member, and the movable frame is rotatably coupled to the side surface inside the seat of the bulging portion.

[0034] According to this aspect, the movable frame can be easily rotatably coupled to the bracket.

[0035] In the above aspect, preferably, the base frame includes a pair of base side members (14) extending in the vertical direction, a pressure receiving member (73) supported via a bridging member is provided between the base side members, and the bracket includes an attachment portion (82) for attaching one end of the bridging member.

[0036] According to this aspect, since there is no need to separately provide a member for coupling the bridging member to the base frame, the number of parts of the vehicle seat can be reduced.

[0037] In the above aspect, preferably, the front coupling portion is provided in front of and behind the attachment portion, respectively.

[0038] According to this aspect, the bridging member can be firmly coupled to the front frame.

[0039] In the above aspect, preferably, the attachment portion has a plate-shaped flange portion (60) having a surface facing the vertical direction, and a through hole (62) provided in the flange portion through which the bridging member is inserted.

[0040] According to this aspect, the erection member can be coupled to the bracket in a simple manner.

[0041] In the above aspect, preferably, the airbag module constitutes an outer airbag module (24L) coupled to the outer side surface of the vehicle of the base frame, and an inner airbag module (24R) including a near-side airbag is further provided on the inner side of the vehicle of the base frame, and the bracket is located between the outer airbag module and the inner airbag module.

[0042] According to this aspect, the inner airbag module and the outer airbag module are arranged on the left and right sides of the movable frame. Thereby, since the inner airbag module and the outer airbag module can be arranged so as to be deployable at the side of the seated person, the safety of the vehicle seat can be improved.

Brief Description of the Drawings

[0043]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Mode for Carrying Out the Invention

[0044] Hereinafter, with reference to the drawings, an embodiment in which the vehicle seat according to the present invention is applied to an automobile seat will be described. In the following description, left and right are defined based on the occupant seated on the seat.

[0045] Also, the direction toward the center in the left-right direction (also referred to as the seat width direction) of the seat in a front view is described as the inner side of the seat (or, inside the seat). Further, the direction away from the center in the left-right direction of the seat is described as the outer side of the seat (or, outside the seat).

[0046] <Overall Configuration 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 a vehicle cabin) of an automobile. Seat 1 includes a seat cushion 4 provided on floor 3, a seat back 5 extending upward from the rear of seat cushion 4, and a headrest 6 provided on the upper part of seat back 5. Seat cushion 4 constitutes a seating surface 4S and supports the buttocks of the seated person. Seat back 5 constitutes a backrest surface 5S facing forward and supports the back of the seated person. Headrest 6 is disposed behind the head of the seated person. Seat cushion 4 may be supported by floor 3 via a slide device (not shown) so as to be slidable back and forth.

[0047] Seat back 5 includes a base portion 8 that constitutes the lower half of backrest surface 5S and a movable portion 9 that constitutes the upper half of backrest surface 5S. Movable portion 9 passes through its lower part and is connected and supported to base portion 8 so as to be rotatable about a rotation axis X (also referred to as a pivot axis) extending in the left-right direction. Thereby, the upper half of backrest surface 5S is configured to be tiltable with respect to the lower half. In the present embodiment, headrest 6 is fixed to the upper part of movable portion 9.

[0048] In seat 1, the upper half of backrest surface 5S is configured to be tiltable with respect to the lower half, and the central portion of seat back 5 can be bent. Therefore, seat back 5 of seat 1 is also referred to as a folding seat back. Hereinafter, the position of movable portion 9 when the upper part of movable portion 9 is tilted most rearward is described as an upright position (also referred to as a rear tilt position), and the position of movable portion 9 that rotates about rotation axis X from the upright position and whose upper part is tilted most forward is described as a forward tilt position.

[0049] 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 part of the surface of the pad member. The pad member that constitutes the seat cushion 4 is formed of a cushion material having elasticity such as polyurethane foam, and the skin material that covers the pad member is preferably formed of genuine leather, synthetic leather, fabric, or the like. The seat cushion 4 is configured by covering the seat cushion frame with the pad member and the skin material.

[0050] The seat back 5 includes a seat back frame 10 that forms a skeleton, a pad member (not shown) supported by the seat back frame 10, and a skin material (not shown) that covers at least a part of the surface of the pad member. The pad member may be configured such that the upper half that constitutes the movable part 9 and the lower half that constitutes the base part 8 are separate bodies so as to facilitate folding of the seat back 5, or the upper half that constitutes the movable part 9 and the lower half that constitutes the base part 8 may be integrally configured. Similarly, the skin material may be configured such that the upper half that constitutes the movable part 9 and the lower half that constitutes the base part 8 are separate bodies.

[0051] Next, the details of the seat back frame 10 will be described.

[0052] As shown in FIG. 2, the seat back frame 10 has a base frame 11 that forms the skeleton of the base part 8, and a movable frame 12 that forms the skeleton of the movable part 9 and is rotatably coupled to the base frame 11 about a rotation axis X. A reclining axis 13 to which a seat cushion frame is connected is provided at the lower part of the base frame 11.

[0053] <Base Frame> As shown in FIGS. 2, 3(A) and 3(B), the base frame 11 has a rectangular frame shape 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 extend in the vertical direction respectively and are arranged at intervals in the left and right directions. The base upper member 15 extends in the left and right directions and connects the upper parts (the upper ends in this embodiment) of the two base side members 14. The base lower member 16 also extends in the left and right directions and connects the lower parts of the two base side members 14. Thereby, the base frame 11 forms a rectangular frame body when viewed from the front.

[0054] In this embodiment, as shown in FIG. 3(B), the base frame 11 includes two base middle members 17 that connect the central portions in the vertical direction of the left base side member 14 and the central portions in the vertical direction of the right base side member 14. The two base middle members 17 are arranged at intervals in the vertical direction. Hereinafter, the base middle member 17 located on the upper side is referred to as the upper middle member 17U, and the base middle member 17 located on the lower side is referred to as the lower middle member 17D. The central portion in the left and right direction of the upper middle member 17U and the central portion in the left and right direction of the base upper member 15 are connected by a central member 18.

[0055] In addition, each of the base side members 14 is provided with a plate-shaped side edge portion 19 that extends inward from the rear end into the seat and has a surface facing forward. The front surface of the side edge portion 19 and the wall surface inside the seat of the base side member 14 are connected at a substantially right angle when viewed from above.

[0056] As shown in FIGS. 4, 5(A) and 5(B), the base frame 11 includes a front panel 20 (also referred to as a front member or a front frame) and a rear panel 21 (also referred to as a rear member or a rear frame).

[0057] As shown in FIG. 5(A), the front panel 20 has a rectangular frame shape formed by a bent sheet metal member. The front panel 20 constitutes the seat occupant side of the base frame 11 and receives the load of the occupant. As shown in FIG. 5(B), the rear panel 21 also has a rectangular frame shape formed by a bent sheet metal member. The rear panel 21 is disposed at a position facing the front panel 20 and constitutes the side of the base frame 11 away from the seat occupant.

[0058] As shown in FIG. 6, the rear panel 21 has an outer frame portion 21A that constitutes the seat outer surface of the base side member 14, a first extending portion 21B that extends from the front edge of the outer frame portion 21A to the inside of the seat, and a second extending portion 21C that extends from the rear edge of the outer frame portion 21A to the inside of the seat. The front panel 20 has an inner frame portion 20A that constitutes the seat inner portion of the base side member 14, a third extending portion 20B that extends from the front edge of the inner frame portion 20A to the outside of the seat, and a fourth extending portion 20C that extends from the front edge of the inner frame portion 20A to the inside of the seat. The inner frame portion 20A and the outer frame portion 21A face each other and are disposed at a spaced-apart position. 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 (by welding in this embodiment), whereby the rear panel 21 is joined to the front panel 20 at the edge. The rear panel 21 cooperates with the front panel 20 to form a closed cross-sectional structure P. Thereby, a cavity 22 is formed in the base frame 11, and the base frame 11 is configured to be hollow.

[0059] In this embodiment, the second extending portion 21C connects the left and right outer frame portions 21A in part, and the fourth extending portion 20C also connects the inner frame portion 20A in part. The base middle member 17 is formed by the second extending portion 21C and the fourth extending portion 20C being overlapped and joined. The center member 18 (specifically, the vertical center portion of the center member 18) is mainly constituted by only the rear panel 21.

[0060] <Airbag module> As shown in FIGS. 3(A) and 3(B), two airbag modules 24 are coupled to the base frame 11. One airbag module 24 is coupled to the outer side (left side in this embodiment) of the base frame 11 (base side member 14) outside the vehicle. Thus, the airbag module 24 coupled to the outer side of the base frame 11 constitutes the outer airbag module 24L.

[0061] The other airbag module 24 is coupled to the inner side (right side in this embodiment) of the base frame 11 (base side member 14) inside the vehicle. Thus, the airbag module 24 coupled to the inner side of the base frame 11 constitutes the inner airbag module 24R including the near-side airbag.

[0062] The outer airbag module 24L and the inner airbag module 24R are respectively located on the left and right sides of the movable frame 12 and are coupled to the outer side surface of the seat of the rear panel 21. Thus, the airbag modules 24 are provided on both the left and right outer side surfaces of the seat of the base frame 11. Therefore, the airbag 25 can be deployed on both sides outside the seat of the seated person, and the safety of the seat 1 is enhanced.

[0063] <Airbag module - Bolt hole - Access hole> As shown in FIG. 6, the airbag module 24 includes an airbag 25, an inflator 26 that deploys the airbag 25 by introducing gas into the airbag 25, and a case 27 that houses the airbag 25 and the inflator 26. A retainer 28 is provided on the inner side surface of the airbag module 24 of the seat. A plurality of stud bolts 29 are provided on the inflator 26. The stud bolts 29 penetrate through the bottom wall of the case 27 and the retainer 28 located inside the seat and project inside the seat.

[0064] As shown in FIGS. 4 and 5(B), fastening holes 30 for passing through stud bolts 29 are provided in the outer frame portion 21A of the rear panel 21. The stud bolts 29 are respectively inserted into the corresponding fastening holes 30, and nuts 31 are coupled thereto, whereby the airbag module 24 is fastened to the side surface outside the seat of the base side member 14 (that is, the side surface outside the seat of the rear panel 21). Hereinafter, the coupling portion with the outer airbag module 24L of the rear panel 21 will be described as the rear coupling portion 32. In the present embodiment, the rear coupling portion 32 is constituted by the fastening holes 30.

[0065] As shown in FIGS. 2 and 5(A), the front panel 20 is provided with access holes 33 which are through holes for accessing the fastening holes 30 from the inside of the seat.

[0066] As shown in FIG. 4, at least one (preferably both) of the width in the front-rear direction and the width in the vertical direction of the access hole 33 is configured to be larger than that of the fastening hole 30, and the area of the opening portion of the access hole 33 is formed to be larger than the area of the opening portion of the fastening hole 30. Thereby, since the operator can easily pass the nut 31 and the tool through the access hole 33, the assembling workability of the airbag module 24 can be improved.

[0067] In the present embodiment, two stud bolts 29 are respectively provided on the airbag module 24. Further, four fastening holes 30 are arranged side by side vertically on one base side member 14 so that the airbag module 24 can be assembled at two upper and lower positions (hereinafter, the upper position and the lower position). Hereinafter, the four fastening holes 30 will be described as the first fastening hole 30A, the second fastening hole 30B, the third fastening hole 30C, and the fourth fastening hole 30D in order from the top.

[0068] The airbag module 24 is assembled to the base side member 14 at the upper position by inserting and fastening the stud bolts 29 into the first fastening holes 30A and the third fastening holes 30C, respectively. On the other hand, the airbag module 24 is assembled to the base side member 14 at the lower position by inserting and fastening the stud bolts 29 into the second fastening holes 30B and the fourth fastening holes 30D, respectively.

[0069] Therefore, two access holes 33, i.e., an upper access hole 33A arranged inside the seat of the first fastening hole 30A and the second fastening hole 30B, and a lower access hole 33B arranged inside the seat of the third fastening hole 30C and the fourth fastening hole 30D, are provided in the inner frame portion 20A of the front panel 20. The upper access hole 33A and the lower access hole 33B are formed side by side vertically on the front panel 20.

[0070] As shown in FIG. 4, the upper access hole 33A is formed so as 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.

[0071] The lower access hole 33B is formed so as 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.

[0072] <Bead> As shown in FIGS. 2 and 5(A), a bead 35 is provided in the vicinity of the access hole 33 of the front panel 20. The bead 35 functions as a rigidity improving portion that enhances the rigidity of the vicinity of the access hole 33 of the front panel 20. In the present embodiment, the bead 35 is provided at a corner portion 36 that is behind the two access holes 33 and is a connecting portion between the side edge portion 19 and the base side member 14 (inner frame portion 20A). The bead 35 forms a protruding ridge at the corner portion 36. The bead 35 may be formed by being pushed out (bent) in a direction in which the front panel 20 inclines forward toward the inside of the sheet at the corner portion 36.

[0073] FIG. 7(A) shows an enlarged view of the vicinity of the bead 35 of the front panel 20. As shown in FIG. 7(A), one bead 35 is provided at the corner portion 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.

[0074] However, the number, shape, and arrangement of the beads 35 are not limited to the mode shown in FIG. 7(A). FIGS. 7(B) to (D) show modified examples of the number, shape, and arrangement of the beads 35.

[0075] In the example shown in FIG. 7(B), one bead 35 is provided at the corner portion 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 below the lower end of the lower access hole 33B.

[0076] In the example shown in FIG. 7(C), one bead 35 is provided at the corner portion 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.

[0077] In the example shown in FIG. 7(D), a plurality of beads 35 are arranged side by side in the vertical direction. The beads 35 may be arranged at equal intervals in the vertical direction. The upper end of the bead 35 located at the uppermost position is located above the upper access hole 33A. The lower end of the bead 35 located at the lowermost position is located below the lower access hole 33B.

[0078] In FIGS. 7(A) to 7(D), the beads 35 provided on the outer vehicle base side member 14 are shown, but beads 35 having shapes corresponding to the respective examples may be provided on the inner vehicle base side member 14. The beads 35 provided on the outer vehicle base side member 14 and the beads 35 provided on the inner vehicle base side member 14 may have the same (symmetrical) shape, or one may be formed to be longer than the other. Also, in the example shown in FIG. 7(D), the number of beads 35 provided on the outer vehicle base side member 14 and the number of beads 35 provided on the inner vehicle base side member 14 may be different.

[0079] As shown in FIG. 6, the front panel 20 may be coupled to the rear panel 21 at a position avoiding the beads 35. Thereby, the front panel 20 and the rear panel 21 can be easily coupled. For the coupling between the front panel 20 and the rear panel 21, various known methods such as joining by laser welding or bolt fastening can be adopted.

[0080] On the other hand, the front panel 20 may be coupled to the rear panel 21 at a position overlapping the beads 35. Thereby, the front panel 20 can be coupled to the rear panel 21 at a highly rigid portion.

[0081] <Movable frame> As shown in FIGS. 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 left and right and each extend in the vertical direction. The movable upper member 39 extends in the horizontal direction and connects the upper portions of the two movable side members 38. Each of the movable side members 38 is rotatably coupled to the base side member 14 about a rotation axis X via a rotation bracket 40 (also referred to as a mounting member) at its lower end. As a result, as can be understood from FIGS. 2 and 9, the movable frame 12 is rotatably coupled (i.e., tiltably) to the base frame 11 about the rotation axis X.

[0082] In the present embodiment, the movable frame 12 is formed of a bent pipe material, but is not limited to this aspect and may be formed of one or more sheet metal members.

[0083] Specifically, as shown in FIG. 9, each of the movable side members 38 has a movable member side portion 41 that constitutes the lower portion and a movable member shoulder portion 42 that constitutes the center and the upper portion. The movable member side portions 41 each extend in the vertical direction. The movable member side portions 41 are each rotatably connected about the rotation axis X via a rotation bracket 40 inside the seat of the base side member 14 at their lower ends. The movable member shoulder portions 42 are each connected to the upper end of the movable member side portion 41. The movable member shoulder portions 42 extend upwardly inclined inwardly of the seat from the upper ends of the movable member side portions 41, then bend upwardly at the movable member bent portion 43, and further extend upwardly. The movable member shoulder portion 42 of the left movable side member 38 is connected to the left end of the movable upper member 39 at its upper end, and the movable member shoulder portion 42 of the right movable side member 38 is connected to the right end of the movable upper member 39 at its upper end.

[0084] In addition, in the present embodiment, as shown in FIG. 2, an auxiliary member 44 connected to the left and right movable side members 38 is provided on the movable frame 12. The auxiliary member 44 is formed of a bent wire and is coupled to the corresponding movable side members 38 at both the left and right ends thereof.

[0085] As shown in FIG. 10, the rotation bracket 40 is fixed to the base frame 11 (specifically, the base side member 14), and connects the movable frame 12 to be rotatable (also referred to as rotatable) about the rotation axis X with respect to the base frame 11 (base side member 14).

[0086] The rotation bracket 40 is formed of a bent sheet metal member. The rotation bracket 40 includes a rotation bracket front portion 45 coupled to the inner side surface of the sheet of the base side member 14 on one side of the left and right, and a rotation bracket rear portion 46 extending inward from the rear edge of the rotation bracket front portion 45 and coupled to the front surface of the side edge portion 19.

[0087] The rotation bracket front portion 45 has a flat plate portion 45A and a bulging portion 45B bulging inward from the sheet. The plate portion 45A is arranged along the inner side surface of the sheet of the front panel 20 constituting the base side member 14. The bulging portion 45B is circular in side view. The bulging portion 45B is spaced apart from the inner side surface of the sheet of the front panel 20 constituting the base side member 14. Through holes 48 (see FIG. 9) are provided at the lower ends of the movable side members 38, respectively. 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. Thereby, the movable side member 38 is rotatably coupled to the pin 49 about the rotation axis X. Thereby, the movable side members 38 are each rotatably coupled to the inner side surface of the sheet of the bulging portion 45B about the rotation axis X.

[0088] As shown in FIG. 9, bolt holes 50 are provided in the front part 45 of the rotating bracket and the rear part 46 of the rotating bracket, respectively. Hereinafter, the bolt hole 50 provided in the front part 45 of the rotating bracket will be referred to as the front bolt hole 50A, and the bolt hole 50 provided in the rear part 46 of the rotating bracket will be referred to as the rear bolt hole 50B.

[0089] On the wall constituting the inner side of the seat of the base side member 14 of the front panel 20, a stud bolt 52 protruding inward of the seat is provided. As shown in FIGS. 5(A) and 5(B), in the present embodiment, a first through hole 53 penetrating the wall is provided in the wall constituting the inner side of the seat 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-rear direction) is provided in a portion of the first through hole 53 located on the inner side of the seat of the side edge portion 19. In the present embodiment, the second through hole 54 penetrates the front panel 20 and the rear panel 21, respectively. However, the second through hole 54 may be configured to penetrate only the front panel 20.

[0090] The stud bolt 52 is inserted into the front bolt hole 50A and the first through hole 53, and a nut 55 is coupled to the stud bolt 52, whereby the front part 45 of the rotating bracket is fastened to the side surface on the inner side of the seat 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 coupled thereto, whereby the rear part 46 of the rotating bracket is fastened to the front surface of the side edge portion 19. Thereby, the rotating bracket 40 is fastened and fixed to the inner surface on the inner side of the seat of the front panel 20 and the side edge portion 19.

[0091] Hereinafter, the first through hole 53 and the second through hole 54, which are the coupling portions of the front panel 20 with the rotating bracket 40, will be collectively referred to as the front coupling portion 58. The rotating bracket 40 is fastened to the front coupling portion 58 of the front panel 20, and the movable frame 12 is rotatably coupled to the front coupling portion 58 via the rotating bracket 40. Two front coupling portions 58 are provided on the front panel 20.

[0092] As shown in FIG. 2, the rotating bracket 40 is positioned between the outer airbag module 24L and the inner airbag module 24R. The rotating bracket 40 is positioned above the rear coupling portion 32. As a result, both of the two front coupling portions 58, which are the coupling portions with the movable frame 12 of the front panel 20, are positioned above the rear coupling portion 32. As shown in FIG. 10, the front coupling portions 58 are provided in front of and behind the rear coupling portion 32, respectively. In this way, since the rotating bracket 40 is coupled to the front panel 20 before and after the rear coupling portion 32, the movable frame 12 can be firmly coupled to the front panel 20.

[0093] As shown in FIGS. 9 and 10, the rotating bracket 40 includes a flange portion 60. The flange portion 60 is formed in a plate shape extending forward from the lower edge of the rear portion 46 of the rotating bracket. The flange portion 60 is formed in a rectangular plate shape having a surface facing in the vertical direction. As shown in FIG. 10, an insertion hole 62 penetrating in the vertical direction is provided at a substantially central portion in the front-rear, left-right directions of the flange portion 60. In the present embodiment, the insertion hole 62 is circular in a top view.

[0094] As shown in FIG. 9, the flange portion 60 is positioned between the two front coupling portions 58 in the front-rear direction. That is, the front coupling portions 58 are arranged in front of and behind the flange portion 60.

[0095] <Headrest frame> As shown in FIG. 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 constituting the headrest 6, and in the present embodiment, it is provided for supporting the headrest 6.

[0096] As shown in FIGS. 2 and 3(A), the headrest frame 64 includes a pair of left and right vertical portions 65 spaced apart from each other left and right, and a horizontal portion 66 extending left and right and connecting the upper edges of the vertical portions 65. The lower ends of the vertical portions 65 are respectively coupled to the movable member bending portions 43. Thereby, the headrest frame 64 is fixed to the movable side member 38.

[0097] Each of the vertical portions 65 has a headrest side portion 68 and a headrest shoulder portion 69. The headrest side portion 68 is coupled to the movable side member 38 at its end and extends upward. The headrest side portion 68 may be coupled (welded) to the movable member bending portion 43. The headrest shoulder portion 69 is coupled to the upper end of the headrest side portion 68 at its end. The headrest shoulder portion 69 extends upwardly inclined inwardly of the seat from the upper end of the headrest side portion 68, bends upwardly at the headrest bending portion 70, and further extends upward.

[0098] In the present embodiment, the headrest frame 64 is constituted by a bent pipe material, but is not limited to this aspect, and may be constituted by one or more sheet metal members.

[0099] The headrest 6 is fixed to the upper portion of the headrest frame 64. The headrest 6 can be constituted by a plate-like member (not shown) facing in 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. By fixing the plate-like member to the headrest frame 64 at the rear surface, the headrest 6 may be coupled to the upper front surface of the headrest frame 64.

[0100] <Pressure-receiving member> As shown in Fig. 2, the seat back frame 10 is provided with a pressure-receiving member 72 for supporting the load of the seated person. 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 arranged above the lower pressure-receiving member 73 in a front view.

[0101] <Lower pressure-receiving member> The lower pressure-receiving member 73 is arranged behind the lower half of the back of the seated person and supports the load of the lower half of the back of the seated person. As shown in Fig. 2, the lower pressure-receiving member 73 is constituted by a plate-shaped member having a flat plate shape. The lower pressure-receiving member 73 may be constituted by a resin plate-shaped member, or may be constituted by a metal plate material or the like.

[0102] As shown in Fig. 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 side portions 77 provided on the left and right edges of the lower main portion 76, respectively. The lower main portion 76 has a rectangular shape extending in the vertical direction in a front view. Each of the lower side portions 77 is connected to the edge portion outside the seat of the lower main portion 76. The lower side portion 77 has a rectangular shape notched in a triangular shape at the upper end outside the seat.

[0103] As shown in Figs. 2 and 3(A), the lower pressure-receiving member 73 is arranged 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 erection member 79.

[0104] The lower erection member 79 is constituted by a bent metal rod-shaped member (a round bar in this embodiment). Note that the lower erection member 79 may be constituted by a metal pipe material.

[0105] As shown in Fig. 9, the lower suspended member 79 has a pair of left and right latching portions 80 and a connecting portion 81 that extends in the left - right direction and connects the lower ends of the latching portions 80. The latching portion 80 has an outer vertical portion 80A that extends upward from the outer end of the seat of the connecting portion 81, a lower horizontal portion 80B that extends inward of the seat from the outer vertical portion 80A, an inner vertical portion 80C that extends upward from the inner end of the seat of the lower horizontal portion 80B, and an upper horizontal portion 80D that extends outward of the seat from the inner vertical portion 80C. At the outer end of the seat of the upper horizontal portion 80D, there are provided retaining portions 80E that extend downward toward the outside of the seat, bend at their extending ends, and then extend downward. As shown in Fig. 2, a hook 81A is provided on the connecting portion 81, and the hook 81A is hooked and fixed at an appropriate position of the base lower member 16. Thereby, the connecting portion 81 is connected to the base lower member 16 (see Fig. 2).

[0106] As shown in Fig. 9, the retaining portion 80E of the lower suspended member 79 is inserted into the insertion hole 62 of the flange portion 60. That is, the one - end side of the lower suspended member 79 is prevented from falling off from the insertion hole 62, and the one - end side of the lower suspended member 79 is coupled to the flange portion 60. Thereby, the lower suspended member 79 can be coupled to the rotating bracket 40 by a simple method. The flange portion 60 and the insertion hole 62 provided in the flange portion 60 constitute an attachment portion 82 for attaching one end of the lower suspended member 79.

[0107] In this way, since the member for connecting the movable frame 12 and the base frame 11 and the member for attaching the lower suspended member 79 to the base frame 11 can be constituted by a single rotating bracket 40 (attachment member), the number of parts of the seat 1 can be reduced without separately providing a member for coupling the lower suspended member 79 to the base frame 11.

[0108] Also, one end of the lower suspended member 79 is coupled to the flange portion 60 of the rotating bracket 40. Therefore, the rigidity of the portion of the rotating bracket 40 where the lower suspended member 79 is attached can be enhanced.

[0109] Further, the front coupling portions 58 are provided in front of and behind the mounting portion 82, respectively. Therefore, compared with the case where the front coupling portions 58 are provided only on one side in the front-rear direction, the rotation bracket 40 can be firmly coupled to the front panel 20, and the lower installation member 79 can be stably supported by the front panel 20.

[0110] A plurality of hooks (not shown) that are hooked on the lower installation member 79 are provided on the rear surface of the lower pressure receiving member 73. By hooking the hooks on the lower installation member 79, the lower pressure receiving member 73 is coupled to the lower installation member 79. Thereby, the lower pressure receiving member 73 is coupled to each of the base side members 14 via the lower installation member 79.

[0111] <Upper pressure receiving member> The upper pressure receiving member 74 is disposed behind the upper part of the back of the seated person and supports the load on the upper part of the back of the seated person. As shown in FIG. 2, the upper pressure receiving member 74 is also constituted by a plate-like member like the lower pressure receiving member 73. The upper pressure receiving member 74 may be constituted by a resin plate-like member, or may be constituted by a metal plate material or the like.

[0112] As shown in FIG. 3(A), the upper pressure receiving member 74 includes a flat upper main portion 84 having a front surface facing in the front-rear direction, and a pair of left and right upper side portions 85 provided on the left and right edges of the upper main portion 84, respectively. As shown in FIG. 2, each of the upper side portions 85 has a flat plate shape, is connected to the edge portion outside the seat (that is, the left and right side edges) of the upper main portion 84, and extends forward toward the outside of the seat. Thereby, the upper pressure receiving member 74 has a shape along the back of the seated person.

[0113] As shown in FIGS. 2 and 3(A), an upper installation member 87 for coupling the upper pressure receiving member 74 to the movable side member 38 is provided on each of the movable side members 38.

[0114] As shown in Fig. 9, the upper mounting member 87 is composed of a pair of left and right side frames 88. The side frame 88 is composed of a bent metal rod-shaped member (round bar in this embodiment). Note that the side frame 88 may be composed of a metal pipe material.

[0115] The side frame 88 has an upper vertical portion 88A extending in the vertical direction, an inclined portion 88B inclined 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.

[0116] Each of the movable side members 38 is provided with a mounting bracket 90 for attaching the upper mounting member 87.

[0117] The mounting bracket 90 is at the central portion of the movable side member 38, and more specifically, is fixed to the upper portion of the movable member side portion 41. In this embodiment, the mounting bracket 90 is composed of a bent sheet metal member and is fixed to the upper portion of the movable member side portion 41 by welding.

[0118] The mounting bracket 90, similar to the lower mounting member 79, is provided with a flange portion 91. The flange portion 91 has a plate shape with a main surface facing in the vertical direction. The flange portion 91 is provided with a mounting hole 92 penetrating in the vertical direction. The upper end of the upper vertical portion 88A of the upper mounting member 87 is inserted into the mounting hole 92. Thereby, the upper mounting member 87 is attached to the movable side member 38 via the mounting bracket 90. That is, the mounting bracket 90 constitutes a portion where the upper mounting member 87 and the movable frame 12 are connected.

[0119] A bent portion 93 bent in the horizontal direction is provided at the upper edge of the upper vertical portion 88A to prevent the upper vertical portion 88A from coming out of the mounting hole 92. Thereby, the side frames 88 are respectively coupled to the movable side members 38, and the upper mounting member 87 is coupled to and supported by the movable side members 38.

[0120] A plurality of hooks (not shown) for being hooked to the upper erection member 87 are provided on the rear surface of the upper pressure receiving member 74. By hooking the hooks to the upper erection member 87, the upper pressure receiving member 74 is coupled to the front surface of the upper erection member 87 and is coupled and supported on the front side of the upper erection member 87. The upper pressure receiving member 74 is coupled to each of the movable side members 38 via the upper erection member 87.

[0121] In the present embodiment, as shown in FIG. 9, a cylindrical member 94 (also referred to as a collar) is provided on the lower erection member 79. The upper erection member 87 is inserted into the cylindrical member 94 together with the lower erection member 79 at the lower edge (lower horizontal portion 88D) and is coupled to the cylindrical member 94. Thereby, the upper pressure receiving member 74 is connected to the lower erection member 79 so as to be tiltable in the front-rear direction. That is, the cylindrical member 94 functions as a connecting portion between the lower erection member 79 and the upper pressure receiving member 74. In order to facilitate the assembly of the cylindrical member 94, one slit (not shown) extending in the left-right direction may be provided on the rear surface of the cylindrical member 94. The cylindrical member 94 may be made of metal or may be made of resin or the like.

[0122] As shown in FIG. 8, when the movable frame 12 rotates about the rotation axis X and tilts forward, a load for trying to tilt the upper pressure receiving member 74 forward is applied via the upper erection member 87. Since the upper pressure receiving member 74 is tiltably connected to the lower erection member 79 via the cylindrical member 94, the upper pressure receiving member 74 rotates following the tilt of the movable frame 12. Therefore, by connecting the lower erection member 79 and the upper erection member 87 with the cylindrical member 94 while reducing the influence of the tilt of the movable frame 12, the upper pressure receiving member 74 can be stably supported by the seat back frame 10.

[0123] One end of the lower erection member 79 is inserted into the insertion hole 62 of the flange portion 60 and is prevented from coming off. Therefore, the lower erection member 79 is supported by the flange portion 60 so as to be slidable in the penetrating direction of the insertion hole 62. Therefore, when the upper erection member 87 is pulled upward, the lower erection member 79 can be moved following it.

[0124] As shown in FIG. 3(A), the upper part 85 on the left side of the upper pressure receiving member 74 and the movable member shoulder part 42 on the left side of the movable side member 38 are arranged at positions aligned in the vertical direction in a front view. Similarly, the upper part 85 on the right side of the upper pressure receiving member 74 and the movable member shoulder part 42 on the right side of the movable side member 38 are arranged at positions aligned in the vertical direction in a front view.

[0125] Thereby, the upper main part 84 is arranged behind the center of the back of the seated person, and the upper part 85 is arranged at a position along the left and right side parts of the back of the seated person. That is, the upper pressure receiving member 74 can be arranged along the back of the seated person.

[0126] In the present embodiment, notches 95 notched upward are provided at the lower edges of the upper parts 85, respectively, as shown in FIG. 3(A). Thereby, when the movable part 9 is in the upright position, the rotating bracket 40 can be visually recognized from the front by an operator performing the assembly, and the assembly workability of the seat 1 is improved.

[0127] In FIG. 11, a first virtual plane S1 along the front surface of the lower main part 76 is shown by a two-dot chain line. As shown in FIG. 11, the cylindrical member 94 is located behind the first virtual plane S1. That is, when viewed in the direction along the front surface of the lower main part 76, the cylindrical member 94 is arranged behind the lower main part 76, and the lower erection member 79 and the upper pressure receiving member 74 are connected behind the lower main part 76. Thereby, it is possible to prevent the seated person from feeling a foreign body sensation due to the connection portion between the lower erection member 79 and the upper pressure receiving member 74.

[0128] In FIG. 11, a second virtual plane S2 along the front surface of the upper main part 84 is shown by a one-dot chain line. As shown in FIG. 11, the cylindrical member 94 is located behind the second virtual plane S2. That is, when viewed in the direction along the front surface of the upper main part 84, the cylindrical member 94 is arranged behind the upper main part 84, and the lower erection member 79 and the upper pressure receiving member 74 are connected behind the upper main part 84. Thereby, it is possible to prevent the seated person from feeling a foreign body sensation due to the connection portion between the lower erection member 79 and the upper pressure receiving member 74.

[0129] Note that the lower pressure receiving member 73 is not coupled to the movable frame 12 and may be coupled to and supported only by the base frame 11. The upper pressure receiving member 74 is not coupled to the base frame 11 and may be coupled to and supported only by the movable frame 12. Thereby, the lower pressure receiving member 73 can rotate with respect to the movable frame 12, and the upper pressure receiving member 74 can rotate with respect to the base frame 11. Thereby, the pressure receiving member 72 that can further reduce the influence due to the tilting of the movable frame 12 can be configured.

[0130] <Actuator> As shown in FIGS. 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.

[0131] As shown in FIG. 8, the actuator 98 includes a motor 98A, a lead screw 98B, and a gear box 98C that converts the rotation of the motor 98A into the linear motion of the lead screw 98B. The gear box 98C includes a gear and a housing that houses the gear. The housing is provided with a through hole through which the lead screw 98B passes. When the output shaft of the motor 98A rotates, one end of the lead screw 98B protrudes or retracts and moves in a direction approaching or separating from the housing. In the present 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 orthogonal to each other.

[0132] A connecting member 100 is fixed to the movable upper member 39, and the lead screw 98B is rotatably connected to the connecting member 100 at its end about an axis Y extending in the left-right direction. Thereby, the actuator 98 is rotatably connected to the movable upper member 39 at the end of the lead screw 98B (the upper end in FIG. 2) about the left-right direction as the axis Y.

[0133] Note that since the connecting member 100 is fixed to the movable upper member 39, the actuator 98 is connected to the portion between the two movable member bending portions 43 of the movable frame 12. Further, as shown in FIG. 3(A), the connection portion between the actuator 98 and the movable frame 12 is located between the headrest bending portions 70 in a front view.

[0134] As shown in FIG. 8, the gear box 98C is rotatably connected to the first connecting bracket 102 about the axis Z in the left-right direction. The first connecting bracket 102 is fixed to the second connecting bracket 103, and the second connecting bracket 103 is fixed to the base upper member 15. Thereby, the gear box 98C is rotatably connected to the base upper member 15 about the axis Z extending in the left-right direction.

[0135] Thereby, one end of the actuator 98 (corresponding to the end of the gear box 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. Thus, 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 about the axes Y and Z extending in the left-right direction, respectively. Thereby, the actuator 98 connects the base upper member 15 and the movable upper member 39, and by driving the actuator 98, it is possible to rotate the movable upper member 39 to approach and separate from the base upper member 15.

[0136] In this embodiment, the actuator 98 was configured to move the movable upper member 39 closer to and away from the base upper member 15, but the present invention is not limited to this aspect. Specifically, the actuator 98 only needs to be connected to the upper portion of the base frame 11 other than the base upper member 15 (specifically, the portion above the rotation axis X) and the movable upper member 39, and may be configured to perform at least one of the operations of moving the movable upper member 39 closer to and away from the upper portion of the base frame 11.

[0137] When the end of the lead screw 98B moves in the direction of protruding from the gear box 98C by driving the actuator 98, the movable upper member 39 is pushed forward with respect to the base upper member 15. As a result, the movable frame 12 rotates about the rotation axis X with respect to the base frame 11 in the direction of tilting forward with respect to the base frame 11.

[0138] When the end of the lead screw 98B moves in the direction of retracting into the gear box 98C by driving the actuator 98, the movable upper member 39 is pulled toward the side of the base upper member 15. As a result, the movable frame 12 rotates about the rotation axis X with respect to the base frame 11 in the direction of tilting backward with respect to the base frame 11.

[0139] In this way, the actuator 98 tilts the movable frame 12 with respect to the base frame 11 and displaces (specifically, rotationally displaces) the movable portion 9 between the forward tilt position and the upright position.

[0140] As shown in FIGS. 2 and 8, at least one of the base frame 11 and the movable frame 12 is provided with a receiving recess 105 for receiving at least a part of the actuator 98. In the present embodiment, the receiving recess 105 is provided at the front surface of the base upper member 15 and at the central portion in the left-right direction thereof. As shown in FIG. 2, the receiving recess 105 is formed as a recess that is recessed rearward (in a direction away from the movable upper member 39) at the front surface of the base upper member 15. At least a part of the actuator 98 (for example, a part of the motor 98A and the lead screw 98B) is received inside the receiving recess 105 in a side view (see FIG. 4).

[0141] The receiving recess 105 is provided at the front surface of the base upper member 15, 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.

[0142] As shown in FIG. 8, the gear box 98C is pivotally supported by the first connecting bracket 102. The second connecting bracket 103 has a U-shaped cross section that opens rearward. The second connecting bracket 103 is respectively joined (by welding in the present embodiment) to the upper surface and the front surface (the 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.

[0143] The second connecting bracket 103 is joined to a position where the front panel 20 and the rear panel 21 of the seat back frame 10 face each other. Thereby, 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. Thereby, the actuator 98 can be supported at a portion of the base frame 11 that has high rigidity and is difficult to deform.

[0144] Since the connecting member 100 is fixed to the movable upper member 39, the actuator 98 is connected to the movable upper member 39, that is, the portion between the two movable member bending portions 43 of the movable frame 12. Therefore, the connection portion between the actuator 98 and the movable frame 12 can be arranged at a position closer to the center of the seat in the left - right direction. As a result, the actuator 98 can stably rotate (tilt) the movable frame 12, for example, as compared with the case where the actuator 98 is connected to the movable side member 38.

[0145] However, specifically, the second connecting bracket 103 is provided at a position biased to either the left or right side in the left - right direction of the receiving recess 105. Therefore, the lead screw 98B is arranged at a position biased to either the left or right side (the outside of the vehicle in this embodiment) in the receiving recess 105. With this arrangement, a sufficient space can be secured between the wall surface defining the other side (the inside of the vehicle in this embodiment) in the left - right direction of the receiving recess 105 and the lead screw 98B to accommodate the motor 98A.

[0146] <Arrangement of members in the upright position and the forward - tilt position> As shown in FIG. 12, when the movable part 9 is in the upright position (when the movable upper member 39 is located at the most rearward position), in a top view, the movable member shoulder part 42 is located behind the rotation bracket 40. Also, at least a part of the movable member shoulder part 42 is located in front of the mounting bracket 90 (the portion where the upper - mounted member 87 and the movable frame 12 are connected). However, the entire movable member shoulder part 42 may be located in front of the mounting bracket 90. Also, at least a part 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.

[0147] By configuring in this way, the upright position can be set to an appropriate position where the movable part 9 does not tilt too much forward or backward, and a large - sized seated person can sit down relaxedly.

[0148] In addition, since the mounting bracket 90 is positioned in front of the actuator 98 and the upper pressure receiving member 74 is supported on the front side of the upper erection member 87, the upper pressure receiving member 74 is disposed in front of the actuator 98. Therefore, it is possible to prevent giving a foreign body sensation caused by the actuator 98 to the seated person.

[0149] As shown in FIGS. 13 and 14, when the movable part 9 is in the forward tilt position (when the movable upper member 39 is located at the most forward position), the portion (flange portion 60) where the lower erection member 79 and the seat back frame 10 are connected is located behind the front end of the actuator 98.

[0150] By configuring in this way, the forward tilt position can be set to an appropriate position capable of supporting the back of a relatively small-sized seated person.

[0151] Also, as shown in FIG. 2, when the movable part 9 is in the upright position, the upper main part 84 of the upper pressure receiving member 74 and the left and right upper side parts 85 are each located above the rotation axis X (see also FIG. 4). Thereby, since the upper pressure receiving member 74 can be rotationally moved so as to protrude forward from the position where the upper part thereof tilts backward due to the forward tilt of the movable frame 12 and stand up (see FIG. 14), the upper pressure receiving member 74 can be supported by the movable frame 12 so that the back of a small-sized seated person can be supported by the rotation of the movable frame 12.

[0152] Note that, as shown in FIG. 14, in both cases where the movable part 9 is in the upright position and the forward tilt position, at least a part of the actuator 98 is located behind the upper pressure receiving member 74. Also, at least a part of the actuator 98 is located behind the headrest frame 64.

[0153] <Method for manufacturing a seat> Next, a method for manufacturing the seat 1 will be described. The method for manufacturing 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 respectively assembling the upper installation member 87 and the lower installation member 79 to the first installation member and the second installation member, 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 pad member, and the skin material are sequentially assembled.

[0154] The first step includes a step of manufacturing the front panel 20 and the rear panel 21 by pressing, and a step of connecting the front panel 20 and the rear panel 21 at the peripheral portion to form the base frame 11. The front panel 20 and the rear panel 21 may be connected by welding, or may be connected by fastening using bolts and nuts.

[0155] The first step may preferably 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 provided before the step of connecting the front panel 20 and the rear panel 21.

[0156] Also, the first step may preferably include a step of fixing (welding in this embodiment) the second connection bracket 103 to the base upper member 15. This step may be performed after the front panel 20 and the rear panel 21 are connected. In this step, the second connection bracket 103 may be connected (welded) to the upper and lower surfaces of the base upper member 15.

[0157] 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 rotation bracket 40, and a step of fixing the rotation 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 (welding in this embodiment) the lower end of the vertical portion 65 to the movable member bending portion 43 of the movable frame 12. The step of rotatably coupling the movable frame 12 to the rotation bracket 40 includes a step of inserting a pin 49 into a through hole 48 provided at the lower end of the movable side member 38 and rotatably connecting the lower end of the movable side frame to the bulging portion 45B of the rotation bracket 40.

[0158] The step of fixing the rotation bracket 40 to the base frame 11 may include a step of positioning the rotation bracket 40 by inserting it into the front bolt hole 50A with respect to the stud bolt 52 provided in the first through hole 53 of the front panel 20, and then, inserting a bolt 56 into the rear bolt hole 50B and the second through hole 54 of the rotation bracket 40 and coupling a nut 57 to couple the rear portion 46 of the rotation bracket and the front panel 20 (fastening in this embodiment). Thereby, after the operator positions the rotation bracket 40 once, the operator can perform the work of coupling the rotation bracket 40 to the base frame 11, so that the ease of assembly work can be improved.

[0159] Note that the step of fixing the rotation bracket 40 to the base frame 11 may also include a step of coupling the front portion 45 of the rotation bracket and the front panel 20 by attaching a nut 55 to the stud bolt 52.

[0160] The third step may include a step of coupling a hook provided on the rear surface of the upper pressure receiving member 74 to the upper erection member 87 and a step of coupling a hook provided on the rear surface of the lower pressure receiving member 73 to the lower erection member 79. In addition, the third step may include a step of coupling the upper erection member 87 and the lower erection member 79 with a cylindrical member 94.

[0161] The fourth step includes inserting the end of the upper erection 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 erection member 79 from above into the insertion hole 62 provided in the flange portion 60 of the rotation bracket 40. In the step of inserting the end of the upper erection member 87 from below, the operator may insert the end of the upper erection member 87 above the position where it should be arranged after installation (also referred to as overstroking), and then perform the step of inserting the end of the lower erection member 79 into the insertion hole 62 from above. Thereby, after assembling the upper erection member 87, the lower erection member 79 can be attached, so that the assembly workability can be improved.

[0162] The fifth step includes rotatably connecting the first connection bracket 102 to the gear box 98C, fixing the first connection bracket 102 to the second connection bracket 103, and rotatably connecting the end of the lead screw 98B to the connection member 100. After these three steps, the actuator 98 is connected to the base frame 11 and the movable frame 12.

[0163] Next, the effects of the seat 1 will be described.

[0164] As shown in FIG. 2, the pressure receiving member 72 that supports the load of the seated person 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, compared with the case where the upper pressure receiving member 74 and the lower pressure receiving member 73 are integrally formed, stress is less likely to occur inside the pressure receiving member 72, and the pressure receiving member 72 is more likely to follow the tilting of the movable portion 9.

[0165] In the present embodiment, the upper erection member 87 is connected to the lower erection member 79 via a cylindrical member 94. Therefore, the upper pressure receiving member 74 is connected to the lower erection member 79 so as to be tiltable in the front-rear direction. Thereby, the upper pressure receiving member 74 can be well supported by the movable frame 12 at the upper and lower portions, and the upper pressure receiving member 74 can be well followed with respect to the tilting of the movable frame 12.

[0166] The base frame 11 (base upper member 15) is provided with a receiving recess 105 for receiving at least a part of the actuator 98. Thus, by providing the receiving recess 105 recessed rearward in the base upper member 15, a space for accommodating functional components can be formed within the receiving recess 105. Also, the actuator 98 and the base frame 11 are arranged so as to overlap in side view. Therefore, the actuator 98 can be arranged compactly (i.e., such that the thickness at the upper part of the seat back frame 10 is reduced).

[0167] The actuator 98 is arranged between the base frame 11 and the movable frame 12. Therefore, by forming the receiving recess 105 to be recessed rearward at the front surface of the base upper member 15, the actuator 98 can be easily accommodated in the receiving recess 105.

[0168] Also, 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 connection portion of the headrest frame 64 to the movable frame 12 does not protrude forward of the movable frame 12. Thus, the headrest frame 64 can be connected to the movable frame 12 while preventing a foreign body sensation from being given to the seated person.

[0169] The movable frame 12 is coupled to the front panel 20 via a rotation bracket 40, and the airbag module 24 is coupled to the rear panel 21. With this configuration, compared to the case where the movable frame 12 and the airbag module 24 are provided on the same panel, the movable frame 12 and the airbag module 24 are more likely to be spaced apart. Therefore, it becomes less likely for the rotation of the movable frame 12 to affect the airbag module 24. Also, since it can be prevented that the deployment of the airbag 25 is obstructed by the movable frame 12, the airbag 25 can be deployed well, and the safety of the seat 1 is enhanced.

[0170] In this embodiment, the rotating bracket 40 is located above the coupling portion (rear coupling portion 32) of the airbag module 24 of the rear panel 21. As a result, the coupling portion (front coupling portion 58) of the movable frame 12 of the front panel 20 is located above the coupling portion (rear coupling portion 32) of the airbag module 24 of the rear panel 21. Therefore, since the movable frame 12 and the airbag module 24 are coupled at positions separated in the vertical direction of the base frame 11, it is possible to prevent the deployment of the airbag 25 from being inhibited by the movable frame 12.

[0171] Also, in both the forward-tilted position and the upright position of the movable portion 9, at least a part of the actuator 98 is located behind the upper pressure receiving member 74. Therefore, it is possible to prevent the seated person from feeling a foreign object due to the actuator 98 as compared with the case where the entire actuator 98 is disposed in front of the upper pressure receiving member 74.

[0172] Although the description of the specific embodiment has been completed above, the present invention can be widely modified and implemented without being limited to the above embodiment.

[0173] For example, in the above embodiment, an example in which the pressure receiving member 72 is constituted by the upper pressure receiving member 74 and the lower pressure receiving member 73 is described, but the pressure receiving member 72 may be constituted by two or more plate members arranged substantially parallel to the backrest surface 5S. In that case, the plate members may be coupled to either the seat back frame 10 or the movable frame 12 at both ends, and may be rotatably connected to adjacent plate members about a rotation axis X extending in the left-right direction.

[0174] In the above-described embodiment, the receiving recess 105 is provided in the base frame 11, but it may be provided in the movable frame 12. In that case, the receiving recess 105 may be formed to be recessed forward in the movable upper frame, and at least a part of the lead screw 98B may be accommodated 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. Further, in the above-described embodiment, an example in which the actuator 98 is received in the receiving recess 105 has been described, but various functional components other than the actuator 98 can be accommodated in the receiving recess 105.

[0175] In the above-described 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 such as aircraft seats and railway seats. Further, not all of the components of the seat 1 shown in the above-described embodiment are necessarily essential, and they can be appropriately selected.

Explanation of Reference Numerals

[0176] 1: Seat (an example of a vehicle seat) 5: Seat back 10: Seat back frame 11: Base frame 12: Movable frame 14: Base side member 20: Front panel (an example of a front member) 21: Rear panel (an example of a rear member) 24: Airbag module 24L: Outer airbag module 24R: Inner airbag module 25: Airbag 32: Rear coupling part 40: Rotating bracket (an example of a bracket) 45A: Plate part 45B: Bulging part 48: Through hole 58: Front coupling part 60: Flange part 62: Insertion hole (an example of a through hole) 73: Lower pressure receiving member (an example of a pressure receiving member) 82: Attachment portion 91: Flange portion P: Closed cross-sectional structure

Claims

1. A vehicle seat, comprising: The seat back frame that constitutes the framework of the seat back A base frame and a movable frame pivotably coupled to the base frame, An airbag module is provided on the base frame, The base frame includes a front member that receives a load of an occupant, and a rear member that is connected to the front member and cooperates with the front member to form a closed cross-sectional structure, The movable frame is coupled to the front member, The airbag module is coupled to the rear member.

2. The movable frame is connected to the front joint portion of the front member, The airbag module is joined to a rear joining portion of the rear member, The vehicle seat according to claim 1 , wherein the front joint portion is located above the rear joint portion.

3. The movable frame is connected to the front connection portion via a bracket, 3. The vehicle seat according to claim 2, wherein the bracket is located above the rear joint portion.

4. 4. The vehicle seat according to claim 2, wherein the front joint portions are provided in front of and behind the rear joint portion.

5. the bracket has a plate portion disposed along a side surface of the front member on an inner side of the seat, and a bulging portion bulging toward the inner side of the seat and spaced apart from the side surface of the front member on the inner side of the seat, 4. The vehicle seat according to claim 3, wherein the movable frame is rotatably coupled to a side surface of the bulging portion on an inner side of the seat.

6. The base frame includes a pair of base side members extending in a vertical direction, A pressure-receiving member is provided between the base side members and is supported via a bridging member, The vehicle seat according to claim 3, wherein the bracket includes a mounting portion for mounting one end of the installation member.

7. 7. The vehicle seat according to claim 6, wherein the front joint portions are provided in front of and behind the mounting portion.

8. 8. The vehicle seat according to claim 6, wherein the mounting portion comprises a plate-shaped flange portion having a surface facing in the up-down direction, and a through hole provided in the flange portion and through which the installation member is inserted.

9. the airbag module constitutes an outer airbag module coupled to a side surface of the base frame on an outer side of the vehicle, An inner airbag module including a near side airbag is further provided on the vehicle inner side of the base frame, 4. The vehicle seat of claim 3, wherein said bracket is located between said outer air bag module and said inner air bag module.

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