JP6643743B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat mounted on a vehicle or the like.

  2. Description of the Related Art In a second or third row of seats of a vehicle, there is known a tumble seat in which a seat cushion is rotated forward around a front end thereof together with a folded seat back to be in an upright storage form (for example, Patent Reference 1). Such a tumble seat is rotatably coupled to the floor at the front end of the seat cushion frame, and is removably coupled to a striker provided on the floor at a coupling mechanism provided at the rear end of the seat cushion frame. . The coupling mechanism has a receiving hole for receiving the striker, and a locking piece protruding into the receiving hole and locking the striker, and the locking piece releases the locking with the striker by manual operation.

JP 2012-131248 A

  In such a tumble seat, since the load of the seat and the occupant is supported on the floor via the coupling mechanism and the striker, the rigidity of the coupling structure between the coupling mechanism and the seat cushion frame poses a problem. Further, it is preferable that the mounting structure of the coupling mechanism to the seat cushion frame be simple from the viewpoint of manufacturing.

  SUMMARY OF THE INVENTION In view of the above background, it is an object of the present invention to provide a vehicle seat that is a tumble seat with a high rigidity and a simple structure for mounting a coupling mechanism that couples to a striker provided on a floor to a seat cushion.

  In order to solve the above-mentioned problem, one aspect of the present invention is a connection that is detachably connected to a front portion rotatably supported on a floor (FL) and a striker (3) provided on the floor. A vehicle seat (S) including a seat cushion frame (F1) having a rear portion provided with a mechanism (20), wherein the seat cushion frame includes a pair of left and right side frames (5) extending front and rear, It has a front frame (6) connecting the front ends of the side frames, and a rear frame (7) connecting the rear portions of the left and right side frames, each of the side frames having a groove opened toward the side. A first member (10) extending forward and backward with a cross-section of a shape, and coupled to the first member to form a closed cross-sectional structure (12) in cooperation with the first member; One member A second member (11) and projecting remote downward, the coupling mechanism is disposed below said first member, characterized in that it is coupled to the second member.

  According to this aspect, since the second member that functions as an attachment portion for attaching the coupling mechanism to the side frame forms a part of the closed cross-sectional structure of the side frame, the rigidity of the coupling mechanism attachment structure to the side frame is reduced. improves. Further, since the coupling mechanism is disposed below the first member, that is, below the closed cross-sectional structure, an increase in the left-right width of the assembly of the coupling mechanism and the side frame is suppressed. Since the coupling mechanism is configured to be coupled to the second member projecting below the first member, the mounting structure of the coupling mechanism is simple. In addition, since the coupling mechanism can be coupled to the second member from the horizontal direction, the mounting operation is easier than when the coupling mechanism is mounted from below.

  In addition, in the above aspect, the front frame is disposed inside the first member, extending rearward from both left and right ends of the base (6A), and coupled to the first member. It is preferable to have an end (6B).

  According to this aspect, the overlap between the front frame and the side frame is increased, and the rigidity of the joint between the first member and the front frame is improved.

  Further, in the above aspect, an end of the front frame protrudes into a front side receiving hole (13) defined between the first member and the second member, and the first member and the second member. It is good to be connected to.

  According to this aspect, since the front frame is connected to both the first member and the second member, the rigidity of the side frame is further improved.

  In the above aspect, the front frame may be formed of a pipe material, and the second member may have a bulged portion (11C) curved along an outer surface of an end of the front frame.

  According to this aspect, the rigidity of the second member is improved by the bulging portion, and the rigidity of the side frame is further improved.

  In the above aspect, the first member includes a first side wall (10A) extending vertically, a first upper wall (10B) protruding laterally from upper and lower ends of the first side wall, and a first side wall (10B). The first lower wall is provided with a projecting piece (10F) that is further laterally provided at a protruding end of the first lower wall. The two members extend downward from the second upper wall and a second upper wall coupled to the first upper wall, and protrude downward from the first lower wall. A second side wall (11A) may be provided, and the second side wall may be formed with an insertion hole (11G) through which the projecting portion passes.

  According to this aspect, since the displacement of the first member and the second member is regulated by the contact between the projecting piece and the hole wall of the insertion hole, the rigidity of the side frame is improved.

  In the above aspect, it is preferable that a locking portion for locking another member is provided at a portion of the protruding piece projecting from the insertion hole.

  According to this aspect, the projecting piece can be used as a support for attaching another member to the seat cushion frame.

  Further, in the above aspect, the second side wall may have a reinforcing structure (15) extending vertically from above the first lower wall to below the first lower wall.

  According to this aspect, the rigidity of the second member is improved. In particular, the rigidity of a portion of the second member to which the coupling mechanism is coupled can be improved.

  In the above aspect, a rear wall (10E) protruding in the same direction as the first side wall is provided at a rear end of the first side wall, and a rear edge (11E) of the second side wall is provided. Is disposed forward of the rear wall, defines a rear receiving hole with the rear wall, an end of the rear frame fits into the rear receiving hole, It may be connected to the member and the second member.

  According to this aspect, the rigidity of the joint between the rear frame and the side frame is improved. Further, since the rear frame is connected to both the first member and the second member, the rigidity of the side frame is improved.

  Further, in the above aspect, the rear wall portion may connect the first upper wall portion and the first lower wall portion and extend along an outer surface of the rear frame.

  According to this aspect, the rigidity of the first member is improved.

  Further, in the above aspect, an intermediate portion of the front frame and the rear frame in the left-right direction is connected by a connecting frame (8) extending forward and backward, and a holder for holding a cable is connected to the connecting frame. It is preferable that a bonding hole (8A) to be formed is formed.

  According to this aspect, the rigidity of the seat cushion frame is improved by the connection frame. In addition, a connecting frame can be used as a support for attaching the holder to the seat cushion frame.

  According to the above configuration, in the vehicle seat that is a tumble seat, the structure for attaching the coupling mechanism to the striker provided on the floor to the seat cushion can be made highly rigid and simple.

The perspective view which looked at the frame of the vehicle seat concerning an embodiment from the left front. Perspective view of the frame showing the periphery of the right cushion side frame in an enlarged manner (indicated by the arrow II in FIG. 1, the striker is omitted). FIG. 2 is a side view of the frame as viewed along arrow III in FIG. IV-IV sectional view of FIG. Perspective view showing the periphery of the connection frame in an enlarged manner (arrow V in FIG. 1).

  Hereinafter, an embodiment in which a vehicle seat according to the present invention is applied to a rear seat (including a second row and a third row) of an automobile will be described with reference to the drawings. In the following description, the left and right are determined based on the occupant sitting on the seat. Further, in the left-right direction, the center side of the sheet is called inward, and the opposite side is called outside. About the same structure provided as a pair of right and left, a common number is attached and description is omitted.

  As shown in FIGS. 1 and 2, the seat S has a seat cushion S1 including a seat cushion frame F1, and left and right seat backs S2 including a seat back frame F2. The seat cushion frame F1 is supported on the floor FL via a pair of left and right support arms 2 and a pair of left and right strikers 3 provided on the floor FL of the vehicle.

  Each of the left and right support arms 2 protrudes upward from the floor FL, and supports the front end of the seat cushion frame F1 at the upper end so as to be rotatable about a rotation axis extending left and right. The support arm 2 is formed from, for example, a sheet metal member. The upper end of the support arm 2 extends forward with respect to the lower end.

  Each of the left and right strikers 3 has a pair of left and right side pillar portions 3A extending upward from the floor FL, and a beam portion 3B extending between the upper ends of the left and right side pillar portions 3A and extending left and right. Is formed. The lower rear portion of the seat cushion frame F1 is detachably connected to the left and right strikers 3 and is supported by the beam 3B from below.

  The seat cushion S1 is formed by attaching a pad and a skin (not shown) to the seat cushion frame F1. The seatback S2 is formed by attaching a pad and a skin (not shown) to the seatback frame F2. The seat cushion frame F1 and the seat back frame F2 are formed by combining a metal plate member, a pipe member, a rod member, and the like.

  The left and right seat back frames F2 are provided to be rotatable (tilted) with respect to the seat cushion frame F1, respectively. Between the seat cushion frame F1 and each seat back frame F2, a reclining mechanism R for fixing the seat back frame F2 to an arbitrary rotation position with respect to the seat cushion frame F1 is interposed.

  As shown in FIGS. 1 and 2, the seat cushion frame F <b> 1 includes a pair of left and right cushion side frames 5 extending in the front-rear direction, a front frame 6 bridged between front portions of the cushion side frames 5, and each cushion side frame 5. It has a rear frame 7 spanned between the rear portions of the frame 5 and a connecting frame 8 extending in the front-rear direction and connecting intermediate portions of the front frame 6 and the rear frame 7 in the left-right direction. I have. The front frame 6 and the rear frame 7 are formed from a pipe material having a circular cross section. The front frame 6 has a front frame base 6A extending left and right, and left and right front frame ends 6B that are bent with respect to the front frame base 6A and extend rearward from both ends of the base. The rear frame 7 extends linearly right and left.

  The left and right cushion side frames 5 have left-right symmetric structures. As shown in FIGS. 2 to 4, each cushion side frame 5 is formed by combining a first member 10 and a second member 11 which are sheet metal members. The second member 11 is disposed on the left and right sides (in the case of the right cushion side frame 5, on the left side of the first member 10) with respect to the first member 10. The first member 10 has a first side wall 10A whose main surface faces left and right and extends forward and backward, and projects left and right inward from each of an upper edge, a lower edge, a front edge, and a rear edge of the first side wall 10A. , A first upper wall 10B, a first lower wall 10C, a first front wall 10D, and a first rear wall 10E extending along each edge. As shown in FIG. 4, the cross section (the cross section viewed from the front and rear) of the first member 10 is directed right and left inward by the first side wall portion 10A, the first upper wall portion 10B, and the first lower wall portion 10C. To form an open channel.

  As shown in FIGS. 2 and 3, the front edge and the rear edge of the first side wall 10A are formed in a semicircular shape when viewed from the left and right, and the first front wall 10D and the first rear wall 10E are It extends up and down while curving along the leading and trailing edges. The upper ends of the first front wall 10D and the first rear wall 10E are connected to the front and rear ends of the first upper wall 10B, and the lower ends of the first front wall 10D and the first rear wall 10E are the first lower wall. It is connected to the front end and the rear end of the wall 10C. The first upper wall portion 10B, the first lower wall portion 10C, the first front wall portion 10D, and the first rear wall portion 10E are continuous so as to form a closed sectional structure when viewed from the left and right directions.

  As shown in FIGS. 2 to 4, the second member 11 has a main surface facing left and right, a second side wall 11 </ b> A extending forward and backward, and projecting left and right outward from an upper edge of the second side wall 11 </ b> A. A second upper wall portion 11B extending back and forth along the upper edge. The second member 11 is shorter in the front-rear direction than the first member 10, and is disposed corresponding to the rear part of the first member 10. The second member 11 is moved so that the upper surface of the second upper wall portion 11B contacts the lower surface of the first upper wall portion 10B, and the left and right outer surfaces of the second side wall portion 11A contact the protruding ends of the first lower wall portion 10C. It is arranged on the first member 10 and the second member 11 and the first member 10 are welded in place. As a result, the first member 10 and the second member 11 cooperate to form the closed cross-sectional structure 12 having a substantially square cross section when viewed from the front and back. The second side wall 11A extends below the first lower wall 10C.

  A bulging portion 11C bulging inward in the left and right direction is formed at the front and upper part of the second side wall portion 11A. The bulging portion 11C protrudes forward beyond the front edge of the second side wall 11A. The bulging portion 11C has a cross section that is convex toward the left and right inwards in a substantially arc shape when viewed from the front and back. The lower edge of the bulging portion 11C extends leftward and rightward along the lower surface of the first lower wall portion 10C, and the upper edge of the bulging portion 11C extends right and left inward and downward with respect to the projecting end of the first upper wall portion 10B. Are arranged via a gap. The first member 10 and the bulging portion 11C cooperate to define a front receiving hole 13 having a substantially C-shaped cross section. The lower edge of the bulging portion 11C is welded to an appropriate position of the first lower wall portion 10C. The second member 11 has a second front wall portion 11D protruding left and right outward from the front edge of the second side wall portion 11A and smoothly continuing to a lower edge of the bulging portion 11C.

  As shown in FIG. 3, a circular cutout 11E is formed at the rear edge of the second side wall 11A. A substantially circular rear receiving hole 14 is defined by the edge of the notch 11E, the first rear wall 10E, and the first upper wall 10B. The second member 11 has a second rear wall portion 11F protruding left and right outward from a portion of the rear edge of the second side wall portion 11A located below the first lower wall portion 10C.

  As shown in FIGS. 2 to 4, a protruding piece 10 </ b> F further protruding inward in the left and right direction is formed at a protruding end of the first lower wall 10 </ b> C. An insertion hole 11G penetrating in the thickness direction is formed in a portion of the second side wall 11A corresponding to the protruding piece 10F. The protruding piece portion 10F passes through the insertion hole 11G and protrudes left and right inward of the second side wall portion 11A. A locking hole 10G, which is a through hole, is formed at a protruding end of the protruding piece 10F that protrudes from the second side wall 11A. When a load is applied to the second member 11 or the first member 10, the displacement of the second member 11 with respect to the first member 10 is regulated by the protrusion 10 </ b> F abutting against the edge of the insertion hole 11 </ b> G.

  The second side wall 11A has a reinforcing structure 15 before and after the insertion hole 11G. In the present embodiment, the reinforcing structure 15 is a bead in which the second side wall 11A bulges in the left and right directions. The reinforcing structure 15 extends from above the first lower wall 10C to below the first lower wall 10C. The reinforcing structure 15 preferably extends from near the upper edge to near the lower edge of the second side wall 11A. The reinforcing structures 15 are provided one by one before and after the insertion hole 11G.

  As shown in FIGS. 2 and 3, the front frame end 6 </ b> B is disposed inside the groove-shaped cross section of the first member 10, and includes a first side wall 10 </ b> A, a first upper wall 10 </ b> B, and a first lower wall. Contact 10C. Further, the rear end of the front frame end 6B is inserted into the front receiving hole 13, and abuts on the first side wall 10A, the first upper wall 10B, the first lower wall 10C, and the bulging portion 11C. The front frame end 6B is welded to an appropriate position of the first member 10 and the bulging portion 11C.

  The left and right ends of the rear frame 7 are inserted into the rear receiving holes 14, and the left and right end surfaces are in contact with the left and right inner surfaces of the first side wall 10A. The outer peripheral surface of the rear frame 7 is in contact with the edges of the notch 11E of the first upper wall 10B, the first rear wall 10E, the first lower wall 10C, and the second side wall 11A. The rear frame 7 is welded to an appropriate position of the first upper wall 10B, the first rear wall 10E, the first lower wall 10C, and the second side wall 11A.

  As shown in FIG. 2, the left and right cushion side frames 5 are rotatably connected to the upper end of each support arm 2 at the front end of each first side wall 10 </ b> A about a rotation axis extending left and right. . The joint between the front end of the first side wall 10A and the upper end of the support arm 2 is surrounded by a protection member 16. The protection member 16 is formed by bending a metal bar, and is welded to the front frame 6. The protection member 16 prevents the pad of the seat cushion S1, the finger of the occupant, and the like from approaching the joint between the first side wall 10A and the support arm 2.

  As shown in FIGS. 3 and 4, a coupling mechanism 20 is coupled to left and right outer surfaces of a portion of the second side wall 11 </ b> A protruding below the first lower wall 10 </ b> C. The coupling mechanism 20 has a casing 23 composed of a base plate 21 and a cover plate 22 which are sheet metal members, a hook 24 rotatably supported in the casing 23, and an urging member 25 for urging the hook 24. The base plate 21 and the cover plate 22 are arranged such that their main surfaces face left and right, and face each other. The cover plate 22 is fastened to the base plate 21 at the front end and the rear end, and an intermediate portion in the front-back direction bulges away from the base plate 21. As a result, an internal space 26 is formed between the base plate 21 and the cover plate 22 at an intermediate portion in the front-rear direction. The portions defining the internal space 26 of the base plate 21 and the cover plate 22 are fastened to each other via a spacer (not shown). A lower edge portion of the cover plate 22 that forms the internal space 26 is bent toward the base plate 21 to close the lower edge of the internal space 26.

  A slit 28 that penetrates each of the base plate 21 and the cover plate 22 in the thickness direction and extends upward is formed. The slits 28 of the base plate 21 and the cover plate 22 are formed in shapes that match each other when viewed from the left and right. The hook 24 is disposed in the internal space 26, and is rotatably supported by the base plate 21 and the cover plate 22 at the shaft portion 24A. The hook 24 is rotatable around a shaft portion 24A between a lock position protruding below the slit 28 (opening end side) and a release position retracting from the slit 28. The biasing member 25 is a tension coil spring, and has one end connected to the locking shaft 24B of the hook 24 and the other end connected to the cover plate 22, and biases the hook 24 toward the lock position. ing.

  The coupling mechanism 20 is disposed such that the base plate 21 abuts on the left and right outer surfaces of a portion of the second side wall 11A protruding below the first lower wall 10C, and includes a cover plate 22, a base plate 21, and a second side wall. It is fastened to the second side wall 11A by a fastening member 29 that integrally joins 11A. The fastening member 29 may be, for example, a bolt and a nut. The coupling mechanism 20 is fastened to the second side wall 11A by a fastening member 29 at one location at the front end and two locations at the rear end. The front end of the coupling mechanism 20 is fastened to a portion of the second side wall portion 11A on the front side of the reinforcement structure 15 on the front side, and the rear end of the coupling portion is fastened to a portion of the rear side of the reinforcement structure 15 on the rear side. I have. In a state where the coupling mechanism 20 is fastened to the second side wall 11A, the coupling mechanism 20 is disposed below the first lower wall 10C. That is, it is arranged below the closed section structure 12 formed by the first member 10 and the second member 11. The slit 28 is disposed between the two reinforcing structures 15 at the front and rear, and the upper end (bottom) of the slit 28 is disposed below the lower edge of the second side wall 11A.

  As shown in FIG. 3, at the use position of the sheet S, the beam 3B of the striker 3 is disposed in the slit 28 of the coupling mechanism 20, and the upper end of the slit 28 is placed on the beam 3B. The outer edge (lower edge) of the hook 24 at the lock position is disposed so as to be inclined with respect to the horizontal plane, and when the beam 3 </ b> B enters the slit 28, the hook 24 resists the urging force of the urging member 25. The beam 3B is pushed away to the release position side. When the beam 3B reaches the upper end of the slit 28, the hook 24 returns to the locked position by the urging force of the urging member 25, and the beam 3B cannot be separated from the slit 28.

  As shown in FIGS. 3 and 4, one end of a control cable 32 is connected to the locking shaft 24 </ b> B of the hook 24. The other end of the control cable 32 is connected to a lever 31 rotatably connected to the rear frame 7. A strap (not shown) that the occupant grips and performs a pulling operation is connected to the lever 31. When the occupant pulls the strap, the hook 24 moves to the release position via the lever 31 and the control cable 32 against the urging force of the urging member 25. In this state, the beam 3B of the striker 3 can be separated from the slit 28.

  As shown in FIG. 5, the connection frame 8 has a rectangular cross section, is formed of a square pipe extending in the front-rear direction, and is formed by welding a front end portion welded to an intermediate portion of the front frame 6 in the left-right direction and a rear frame 7. And a rear end welded to an intermediate portion in the left-right direction. The connection frame 8 has a plurality of coupling holes 8A penetrating in the left and right directions in the left and right side walls. A holder (not shown) for holding a cable such as a wire harness or a control cable is connected to the connection hole 8A. The holding tool is, for example, a clip (fastener) formed of a resin, and preferably has an elastic claw that is inserted into the coupling hole 8A and is hooked.

  A frame-shaped support member 8B that protrudes left and right with respect to the connection frame 8 is connected to the upper surface of the connection frame 8. The support member 8B is formed of, for example, a bent metal bar. Between the front frame 6 and the rear frame 7, a plurality of springs 34 extending back and forth in the waveform are stretched. The support member 8B and the spring 34 support the pad of the seat cushion S1 from below.

  As shown in FIG. 1, a support block 36 projecting upward from the rear frame 7 is coupled to the middle of the rear frame 7 in the left-right direction. At the upper end of the support block 36, a support shaft 37 projecting left and right is provided. Support plates 39 are fastened to the left and right outer surfaces of the rear ends of the first side walls 10A of the left and right first members 10, respectively. The support plate 39 protrudes upward from the first side wall 10A. The right seat back frame F2 is rotatably supported by the right support plate 39 and the right support shaft 37 of the support block 36, and the left support plate 39 and the left support shaft 37 of the support block 36 The left seat back frame F2 is rotatably supported.

  The right seatback frame F2 has an upper side and a lower side extending left and right, and a left side and a right side extending vertically, and is connected to a pipe frame 41 formed in a rectangular frame shape and left and right sides of the pipe frame 41. It has a left and right back side frame 42, a frame-shaped expansion frame 43 connected to the upper side of the pipe frame 41 and extending upward, and a pan frame 44 connected to the rear portions of the pipe frame 41 and the expansion frame 43. The right back side frame 42 is rotatably supported by the support plate 39 via the reclining mechanism R, and the left back side frame 42 is rotatably supported by the right support shaft 37 of the support block 36. Since the left seat back frame F2 has a symmetrical structure with the right seat back frame F2, the description of the right seat back frame F2 described above is referred to, and the description is omitted.

  With the above configuration, the coupling mechanism 20 is disposed below the closed cross-sectional structure 12, and the support plate 39, that is, the rotation axis of the seat back frame F2, is disposed above the closed cross-sectional structure 12. That is, the coupling mechanism 20 is disposed below the rotation axis of the seat back frame F2.

  The sheet S configured as described above can be deformed from the use state to the tumble storage state. First, the seat back S2 is rotated forward with respect to the seat cushion S1 by operating the reclining mechanism R of the seat S in use, and the seat back S2 is folded on the seat cushion S1. In this state, the binding mechanism 20 is released by pulling the strap, and the rear portion of the seat cushion S1 is caused to move forward and upward about the front end of the seat cushion S1 as a rotation center, so that the seat S is in a tumble storage state.

  The effect of the sheet S configured as described above will be described. In the seat S according to the present embodiment, the rigidity of the cushion side frame 5 is improved by the closed cross-sectional structure 12 formed by the first member 10 and the second member 11. Since the second member 11 functioning as an attachment portion for attaching the coupling mechanism 20 to the cushion side frame 5 forms a part of the closed cross-sectional structure 12 of the cushion side frame 5, the coupling mechanism 20 is attached to the cushion side frame 5. The rigidity of the structure is improved. Further, since the coupling mechanism 20 is disposed below the first member 10, that is, below the closed cross-sectional structure 12, an increase in the left-right width of the assembly including the coupling mechanism 20 and the cushion side frame 5 is suppressed. Since the coupling mechanism 20 is configured to be fastened to the second member 11 projecting below the first member 10 from the left and right directions, the mounting structure of the coupling mechanism 20 is simple. In addition, since the coupling mechanism 20 can be coupled to the second member 11 from the horizontal direction, the attaching operation is easier than when attaching from below.

  In addition, at the joint between the coupling mechanism 20 and the second member 11, the base plate 21 and the second side wall 11A are stacked and arranged, so that the rigidity of the coupling mechanism 20 and the second member 11 is improved.

  The front frame end 6B is disposed in a groove formed by the first upper wall 10B, the first side wall 10A, and the first lower wall 10C of the first member 10, and the first upper wall 10B, the first side wall. 10A and the first lower wall portion 10C are joined to the first member 10 in a state of being in contact therewith, so that the rigidity of the seat cushion S1 frame is improved. Also, the front frame is formed in the front receiving hole 13 defined by the bulging portion 11C of the second member 11 and the first upper wall portion 10B, the first side wall portion 10A, and the first lower wall portion 10C of the first member 10. The first member 10 is inserted in a state where the rear end of the end 6B is inserted and the front frame 6 is in contact with the first upper wall 10B, the first side wall 10A, the first lower wall 10C, and the bulging portion 11C. And the second member 11, the rigidity of the seat cushion S1 frame is improved. In addition, the rigidity of the second member 11 is improved by the bulging portion 11C having a three-dimensional structure.

  The rigidity of the second member 11 is improved by the bulging portion 11C and the reinforcing structure 15 having a three-dimensional structure. Since the reinforcing structure 15 extends from a portion of the second member 11 forming the closed-section structure 12 to a portion where the coupling mechanism 20 is fastened, the load applied from the coupling mechanism 20 to the second member 11 is reduced by a force applied to the second-member 11 in the closed-section structure 12. Can be transmitted efficiently.

  Since the rear frame 7 is inserted into the rear receiving hole 14 defined by the first member 10 and the second member 11 and is connected to the closed sectional structure 12 formed by the first member 10 and the second member 11, the cushion is provided. The rigidity of the joint structure between the side frame 5 and the rear frame 7 is improved, and the rigidity of the cushion side frame 5 is improved.

  Since the support plate 39 that rotatably supports the seat back frame F2 is coupled to the portion of the first member 10 that forms the closed cross-sectional structure 12, the rigidity of the support plate 39 is improved, and the seat back frame F2 is stable. It is well supported.

  Since the front frame 6 and the rear frame 7 are connected by the connection frame 8, the opening of the frame-shaped seat cushion frame F1 is divided into two, and the rigidity of the seat cushion frame F1 is improved. The connection frame 8 also functions as a support, and can support another member such as a cable at the center of the seat cushion S1.

  Although the description of the specific embodiments has been completed above, the present invention can be widely modified without being limited to the above embodiments. In the above embodiment, the second member 11 is arranged inside the left and right of the first member 10, but the second member 11 may be arranged outside the left and right of the first member 10.

2: support arm 3: striker 5: cushion side frame 6: front frame 6A: front frame base 6B: front frame end 7: rear frame 8: connecting frame 8A: coupling hole 10: first member 10A: first side wall portion. 10B: first upper wall portion 10C: first lower wall portion 10D: first front wall portion 10E: first rear wall portion 10F: projecting piece portion 10G: locking hole 11: second member 11A: second side wall portion 11B : Second upper wall portion 11C: bulging portion 11E: notch portion 11G: insertion hole 12: closed sectional structure 13: front side receiving hole 14: rear side receiving hole 15: reinforcing structure 20: coupling mechanism 24: hook 28: slit FL : Floor F1: Seat cushion frame F2: Seat back frame R: Reclining mechanism S: Seat S1: Seat cushion S2: Seat back

Claims (10)

A vehicle seat including a seat cushion frame having a front portion rotatably supported on a floor and a rear portion provided with a coupling mechanism removably coupled to a striker provided on the floor,
The seat cushion frame includes a pair of left and right side frames extending front and rear, a front frame connecting front ends of the left and right side frames, and a rear frame connecting rear portions of the left and right side frames,
Each of the side frames includes a first member and a second member coupled to the first member and protruding below the first member,
A lower portion of the first member and the second member form a coupling portion coupled to each other;
The coupling mechanism is coupled to the second member below the first member,
The coupling mechanism includes a slit into which the striker enters,
A vehicle seat in which the connecting portion is disposed on an extension of the slit when viewed from a left-right direction. The first member has a protruding piece protruding laterally,
The second member has an insertion hole through which the protruding piece portion passes,
2. The vehicle seat according to claim 1, wherein the connecting portion is formed by the projecting piece passing through the insertion hole. 3. The first member extends forward and backward with a groove-shaped cross section that opens laterally;
The vehicle seat according to claim 2, wherein the second member cooperates with the first member to form a closed cross-sectional structure. The vehicle seat according to claim 2 or 3, wherein the second member has a reinforcing structure before and after the insertion hole. The vehicle seat according to claim 4, wherein the reinforcing structure is a bead. The vehicle seat according to claim 5, wherein the reinforcing structure extends vertically from above the joint and below the joint. The vehicle seat according to claim 6, wherein the reinforcing structure extends in parallel with an extending direction of the slit. The vehicle seat according to any one of claims 4 to 7, wherein the striker is disposed between two adjacent reinforcing structures in the front-rear direction. The coupling mechanism has a base plate that is a sheet metal member,
The base plate extends vertically along the second member, and has a lower portion of the base plate fastened to the second member, an upper portion of the base plate extending laterally from an upper end of the lower portion of the base plate and located below the closed cross-sectional structure. The vehicle seat according to claim 3, comprising: The vehicle seat according to claim 9, wherein the upper portion of the base plate is orthogonal to the lower portion of the base plate.

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