Vehicle seat

Abstract

The invention provides a vehicle seat capable of improving operability of tilting operation and reducing the overall size of the vehicle seat. A vehicle seat (1) is provided with: a link mechanism (60) axially supported by a seat cushion (2) (seat cushion frame (20)), a seat back (3) (back frame (30)), and a leg rest (4) (leg rest frame (40)); and a hinge pin (38) which can be engaged with and disengaged from the link mechanism (60). The hinge pin (38) is engaged with the link mechanism (60) when the vehicle seat (1) is in a state between a seated position and a released position. As a result, the seat back (3) and the leg rest (4) can be tilted in conjunction with the sliding movement of the seat cushion (2) with respect to the vehicle body (vehicle body) (Bd). Therefore, the vehicle seat (1) can improve the operability of the tilting operation and reduce the overall size of the vehicle seat (1).

Description

Technical Field

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat capable of achieving both improvement in operability of a reclining operation and miniaturization of the entire vehicle seat. Background Art

[0002] There is known a vehicle seat in which a backrest seat (seat back) and a footrest (leg rest) can be tilted in conjunction with each other (Patent Document 1). Prior Art Literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2015-003632 Summary of the invention Problems to be solved by the invention

[0004] However, in the above-mentioned existing technology, the seat back of the vehicle seat is linked to the leg rest, but not to the seat cushion. Therefore, in order to tilt the seat as a whole, in addition to the operation of tilting the seat back and the leg rest in a linked manner, an operation of tilting the seat cushion is also required. Therefore, the tilting operation in the case of tilting the vehicle seat as a whole tends to become complicated. In addition, when an electric tilting mechanism is provided and the positions of the various parts of the vehicle seat (seat cushion, seat back and leg rest) are registered to tilt the vehicle seat as a whole, the operability of the tilting operation can be improved, but the tilting mechanism needs to be provided in each part, and the vehicle seat as a whole tends to be large-scale. That is, there is a problem that it is impossible to take into account both the improvement of the operability of the tilting operation and the miniaturization of the vehicle seat as a whole.

[0005] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a vehicle seat capable of achieving both improvement in operability of a reclining operation and miniaturization of the entire vehicle seat. Technical solutions to solve problems

[0006] In order to achieve the above object, the vehicle seat of the present invention comprises: a seat cushion, which is slidably arranged on the bottom surface of the vehicle body; a seat back, which is rotatably supported by the rear end side of the seat cushion and is configured to be tiltable relative to the seat cushion; and a leg rest, which is rotatably supported by the front end side of the seat cushion and is configured to be tiltable relative to the seat cushion, the vehicle seat comprising a linkage unit, which links the sliding movement of the seat cushion, the tilting of the seat back and the tilting of the leg rest, and the linkage unit is configured to: tilt the seat back in a rearward tilting direction in linkage with the forward sliding movement of the seat cushion and tilt the leg rest in a direction extending forward, and to tilt the seat back in a standing direction in linkage with the rearward sliding movement of the seat cushion and tilt the leg rest in a backward retreating direction. Effects of the Invention

[0007] According to the vehicle seat of solution 1, the linkage unit is configured to tilt the seat back in a backward tilting direction and tilt the leg rest in a forward extending direction in linkage with the forward sliding movement of the seat cushion, and tilt the seat back in a standing direction and tilt the leg rest in a backward retreating direction in linkage with the backward sliding movement of the seat cushion, so that the posture of the entire vehicle seat including the seat back and the leg rest can be changed only by sliding the seat cushion. Therefore, the operability of the tilting operation can be improved.

[0008] In addition, the linkage unit can change the posture of both the seat back and the leg rest in linkage with the sliding movement of the seat cushion, so that it is not necessary to separately provide a tilting mechanism for changing the posture of the seat cushion, the seat back and the leg rest, and the overall vehicle seat can be miniaturized. As a result, it is possible to achieve both improvement in the operability of the tilting operation and miniaturization of the overall vehicle seat.

[0009] According to the vehicle seat of the second solution, in addition to the effects of the vehicle seat of the first solution, since the plane on which the seat cushion slides is inclined downward from the front to the rear, when the seat cushion is returned from the front to the rear, in addition to the force for sliding the seat cushion, even if an additional force is required for raising the seat back, the seat cushion can be easily slid (and easily returned) by the deadweight of the seat occupant. Therefore, the operability of the reclining operation can be improved.

[0010] According to the vehicle seat of the third solution, in addition to the effect of the vehicle seat of the second solution, the downward tilt angle is 4 degrees or less, so even if the plane of the seat cushion sliding movement is tilted downward from the front to the rear, the tilt angle can be made gentle, and the seat cushion can be easily slid when changing from the rear to the front, and when returning from the front to the rear. Therefore, the operability of the tilting operation can be improved.

[0011] According to the vehicle seat of the fourth embodiment, in addition to the effects of the vehicle seat of the first embodiment, since the linkage unit includes: a striker, which is arranged on the vehicle body; and a guide unit, which is arranged on the seat back and guides the tilting of the seat back relative to the striker, the seat back can be tilted in the upright direction and in the rearward tilting direction in conjunction with the sliding movement of the seat cushion, and the seat back can be supported by the striker. Therefore, the rigidity of the vehicle seat can be improved.

[0012] In addition, the vehicle seat is configured such that the linkage unit is linked to the forward sliding movement of the seat cushion to tilt the seat back in the backward tilting direction and tilt the leg rest in the direction of extending forward, so that when the seat occupant leans his back against the seat back and performs a reclining operation, the seat back is guided by the guide unit to tilt in the backward tilting direction relative to the striker, and the portion of the seat back supported by the seat cushion shaft moves forward. Therefore, the seat cushion can be easily slid forward by the weight of the seat occupant (the weight of the seat occupant leaning on the seat back). As a result, the operability of the reclining operation can be improved.

[0013] According to the vehicle seat of the fifth embodiment, in addition to the effects of the vehicle seat of the fourth embodiment, since the surfaces of the first and second sliding parts on the side opposite to the side on which the striker slides, the end surface of the first vertically disposed part, and the end surface of the second vertically disposed part are connected to the inner surface of the cover, the loads received by the first and second sliding parts from the striker can be dispersed to the cover. As a result, the strength of the guide unit (cover, reinforcing member) can be improved.

[0014] According to the vehicle seat of the sixth embodiment, in addition to the effects of the vehicle seat of the fifth embodiment, the locking mechanism can switch between a locked state in which the first path is disconnected from the second path and a locked released state in which the first path is connected to the second path by rotating the claw, so that the striker can be pulled out of the cover by rotating the claw. If the seat back is tilted in the forward tilting direction in this state, the striker can be pulled out on the seat back side (as well as the operation during the reclining operation). Therefore, the operability during the reclining operation can be improved.

[0015] According to the vehicle seat of the seventh solution, in addition to the effect of the vehicle seat of the sixth solution, the linkage unit includes: a snap-fitting part, which is arranged on the seat back; and a connecting member, which is axially supported by the seat cushion, the seat back and the leg rest, respectively. Since the connecting member is arranged on the side of the snap-fitting part that causes the seat back to tilt in the rearward tilting direction, the snap-fitting part and the connecting member are engaged by sliding the seat cushion to cause the seat back to tilt in the rearward tilting direction or tilt in the upright direction, so that the linkage can be achieved. In addition, since the connecting member is not arranged on the side of the snap-fitting part that causes the seat back to tilt in the upright direction, the snap-fitting part and the connecting member can be separated and the linkage can be released by only tilting the seat back independently in the upright direction. As a result, the structure for engaging and releasing the snap-fitting part and the connecting member can be simplified. Therefore, the manufacturing cost of the components can be reduced, and the assembly man-hours of the components can be reduced. As a result, the manufacturing cost of the vehicle seat can be reduced.

[0016] Furthermore, with respect to the seat cushion and the leg rest, when the locking mechanism is unlocked and the seat back is tilted from the first position to the position overlapping the seat cushion, no member is provided on the track along which the seat back and the engaging portion move, so that the vehicle seat can be folded down simply by unlocking the locking mechanism and tilting the seat back from the first position toward the position overlapping the seat cushion.

[0017] Furthermore, by tilting the seat back from the first position to the position overlapping the seat cushion, the engaging portion and the connecting member are separated, thereby releasing the linkage, so that the operation for releasing the linkage is not required during the folding operation. Therefore, the operation during the folding operation can be simplified. As a result, the operability can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a perspective view of a vehicle seat in one embodiment. Figure 2 It is a three-dimensional diagram of the seat frame. Figure 3 is from Figure 2 A top view of the seat frame as viewed from the direction of arrow III. Figure 4A is from Figure 2 A side view of the seat frame as viewed in the direction of arrow IVa. Figure 4B is from Figure 4A A forward view of the backrest frame observed in the direction of arrow IVb. Figure 5A yes Figure 4A A cross-sectional view of the backrest frame at the Va-Va line. Figure 5B yes Figure 4A A cross-sectional view of the backrest frame at line Vb-Vb. Fig. 6A yes Figure 5A A cross-sectional view of the backrest frame at line VIa-VIa. Figure 6B It is a schematic diagram showing the relationship between the locking mechanism and the load input to the striker. Fig. 7A is a perspective view of the first reinforcing member. Figure 7B is a perspective view of the second reinforcing member. Fig. 8A is a schematic diagram of the seat frame in the seated position. Figure 8B is a schematic diagram of the seat frame in the working position. Figure 8C is a schematic diagram of the seat frame in the relaxed position. Fig.9A is a side view of the hood in the seated position. Fig. 9B is a side view of the hood in the working position. Fig. 9C is a side view of the hood in a relaxed position. Fig. 10A It is a side view of the seat frame in the unlocked state. Fig. 10B It is a side view of the seat frame in the folded down state. DETAILED DESCRIPTION

[0019] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 1 is a perspective view of a vehicle seat 1 according to an embodiment of the present invention. The arrows FB, UD, and LR in the figure respectively indicate the front-rear direction, the up-down direction, and the left-right direction (in Figure 2 to Figure 1 0).

[0020] like Figure 1 As shown, the vehicle seat 1 is a seat for automobiles, railway vehicles and airplanes. The vehicle seat 1 includes a seat cushion 2 for supporting the buttocks of the occupant when the occupant is seated, a seat back 3 for supporting the back of the occupant, a leg rest 4 for supporting the legs of the occupant, and a headrest 5 for supporting the head of the occupant. In the present embodiment, the vehicle seat 1 is a seat arranged on the left side (the side in the direction of arrow L) in the rear seat of the car, and is arranged with the front of the vehicle seat 1 (the direction of arrow F) being consistent with the front of the car. It should be noted that the vehicle seat 1 can be a seat after the third row of the car, or it can be a seat arranged on the right side (the side in the direction of arrow R) or the center side.

[0021] It should be noted that the tilt operation of the vehicle seat 1 can consider: a method in which the operator (sitter) operates the seat back 3 and changes the posture of the seat cushion 2 and the leg rest 4 by interlocking with the tilting of the seat back 3, and a method in which the operator operates the leg rest 4 and changes the posture of the seat cushion 2 and the seat back 3 by interlocking with the tilting of the leg rest 4. However, for the sake of convenience, as an example, a method in which the operator operates the seat cushion 2 and changes the posture of the seat back 3 and the leg rest 4 by interlocking with the sliding movement of the seat cushion 2 will be described.

[0022] The vehicle seat 1 includes a linkage unit (in this embodiment, a cover 32, a first reinforcement member 35, a second reinforcement member 36, a locking mechanism 39, a hinge pin 38, a link mechanism 60, and a striker 70 (see Figure 2 9), the linkage unit is linked in the following manner: through the seat cushion 2 relative to the bottom surface Bd1 of the vehicle body Bd (refer to Figure 4A ) slides and moves, thereby causing the seat back 3 to tilt in the upright direction and in the backward direction, and at the same time, causing the leg rest 4 to tilt in the direction of extending forward (in the direction of arrow F) and in the backward direction.

[0023] The vehicle seat 1 of the present invention can change the postures of the seat back 3 and the leg rest 4 by sliding the seat cushion 2 relative to the vehicle body Bd, so that the vehicle seat 1 can be made smaller as a whole compared to a vehicle seat provided with a tilt mechanism for changing the postures of the seat cushion 2, the seat back 3 and the leg rest 4. Therefore, the vehicle seat 1 can be adopted even in vehicles such as light cars and SUVs, which have a relatively narrow interior space and can only use a limited space.

[0024] In addition, the entire vehicle seat 1 can be tilted only by sliding the seat cushion 2 without changing the postures of the seat cushion 2, the seat back 3, and the leg rest 4. Therefore, the vehicle seat 1 can improve the operability of the tilting operation.

[0025] Next, refer to Figure 2 , Figure 3 and Figure 4A , the seat frame 10 serving as the framework of the vehicle seat 1 will be described. Figure 2 is a perspective view of the seat frame 10, Figure 3 is from Figure 2 A top view of the seat frame 10 observed in the direction of arrow III, Figure 4A is from Figure 2 A side view of the seat frame 10 as viewed from the direction of arrow IVa. Figure 2 , Figure 3 and Figure 4A In, omitted Figure 1 5 and 10 , which are the same as the frame of the headrest 5 and the plate-like support plate arranged at the rear (direction B) of the pipe 31 of the backrest frame 30 .

[0026] like Figure 2 , Figure 3 and Figure 4A As shown, the seat frame 10 includes: a steel cushion frame 20, which serves as a skeleton of the seat cushion 2; a steel backrest frame 30, which is rotatably supported on the rear side (in the direction of arrow B) of the cushion frame 20 and serves as a skeleton of the seat back 3; a steel leg rest frame 40, which is rotatably supported on the front side (in the direction of arrow F) of the cushion frame 20 and serves as a skeleton of the leg rest 4; and a steel headrest frame (not shown) which serves as a skeleton of the headrest 5.

[0027] The seat cushion frame 20 includes: side frames 21 as plate-like members, which are arranged to be opposed to each other in the left-right direction (arrow LR direction) and extend in the front-back direction (arrow FB direction); and a plurality of pipes 22 (three in the present embodiment) connecting the two side frames 21 arranged opposite to each other in the opposite direction. The lower surface 23 of the side frame 21 is formed in a flat surface.

[0028] The lower surface 23 of the side frame 21 is supported by the seat slide 50 so that the entire cushion frame 20 can slide relative to the bottom surface Bd1 of the vehicle body Bd.

[0029] Regarding the vehicle seat 1, the backrest frame 30 and the link mechanism 60 are inserted through the first shaft 24 on the rear end side of the side frame 21 and are supported in a manner rotatable relative to the side frame 21 (seat cushion frame 20), and the leg rest frame 40 is inserted through the second shaft 25 on the front end side of the side frame 21 and is supported in a manner rotatable relative to the side frame 21. The axial direction of the first shaft 24 and the axial direction of the second shaft 25 extend in the left-right direction (arrow LR direction) and are parallel to each other.

[0030] The backrest frame 30 includes: a cylindrical tube 31 extending to form substantially rectangular sides; a steel side frame 37 disposed on the lower end side of the tube 31; and a cover 32 connected between the end portions 31a and 31b of the tube 31 and having a hollow interior.

[0031] The tube 31 includes a left side portion 31c, and the outer peripheral surface of the end portion 31a on one side is connected to the lower end of the cover 32 (see Figure 5B), and extending downward (in the direction of arrow D) from the connected portion; a bottom portion 31d extending from the lower end of the left side portion 31c to the right (in the direction of arrow R); a right side portion 31e extending from the right end of the bottom portion 31d to the upper side (in the direction of arrow U); and an upper portion 31f extending from the upper end of the right side portion 31e to the left (in the direction of arrow L). The upper portion 31f has an end portion 31b on the other side that passes through the cover 32 in the lateral direction (left-right direction (arrow LR direction)). The end portion 31b is a portion of the upper portion 31f located on the inner side of the cover 32 and a portion that protrudes to the left from the outer surface of the cover 32.

[0032] In this embodiment, the seat cushion 2 (seat cushion frame 20) of the vehicle seat 1 is located at the rearmost position (in the direction of arrow B), and within the movable range accompanied by linkage, the position where the seat back 3 (backrest frame 30) is maximally erected and the leg rest 4 (leg rest frame 40) is maximally retreated is defined as the seat position (refer to Fig. 8A The position where the seat cushion 2 is located at the front (arrow F direction), the seat back 3 is tilted backward to the maximum extent and the leg rest 4 is extended forward to the maximum extent within the movable range of the linkage is defined as the relaxation position (refer to Figure 8C The position between the seated position and the relaxed position is defined as the working position (refer to Figure 8B ). In addition, the action of laying down the seat back 3 in such a manner that the headrest 5 side of the seat back 3 overlaps the front side (arrow F direction) of the seat cushion 2 is defined as a laying down action (refer to Fig. 10A and Fig. 10B ).

[0033] The side frame 37 is a plate-shaped member that is separated from each other and arranged opposite to each other in the left-right direction (arrow LR direction), and the inner surface (the surface facing the center of the seat frame 10) is arranged on the lower end side of each of the left side portion 31c and the right side portion 31e of the tube 31. The side frame 37 is rotatably supported by the first shaft 24 in such a manner that the outer surface of the side frame 37 (the surface on the side opposite to the surface facing the center of the seat frame 10) faces the inner surface of the side frame 21. Since the side frame 37 is rotatably supported relative to the side frame 21, the seat back 3 (back frame 30) can be tilted in the standing direction and in the rearward tilting direction relative to the seat cushion 2 (seat cushion frame 20). It should be noted that when the vehicle seat 1 is in a state between the seat position and the relaxed position, the center of gravity of the back frame 30 and the seat back 3 is located at a position further rearward (arrow B direction) than the first shaft 24.

[0034] A cylindrical hinge pin 38 is provided on the side frame 37 so as to protrude outward from the outer surface. When the vehicle seat 1 is located between the seat position and the relaxed position, the hinge pin 38 is located further rearward (in the direction of arrow B) than the first shaft 24 and abuts against the upper (in the direction of arrow U) side surface of the outer periphery 61a of the link bracket 61 described later. In addition, the hinge pin 38 is separated from the upper side surface of the outer periphery 61a during the reclining operation (when the seat back 3 is tilted forward from the seat position).

[0035] The cover 32 includes: a first cover 32a, which is formed with a long hole 33a, a long hole 34a, and a slit 33b, a slit 34b for inserting the striker 70; and a second cover 32b, which is joined to the first cover 32a to form a space inside (see Figure 4B , Figure 5A and Fig. 6A ).

[0036] The leg rest frame 40 includes: side frames 41 that are separated from each other and arranged opposite to each other in the left-right direction (arrow LR direction); and a plurality of pipes 42 (three pipes in this embodiment) that connect the two oppositely arranged side frames 41 in the opposing direction.

[0037] The side frame 41 is a plate-shaped member extending in the longitudinal direction, and one end side thereof is rotatably supported by the second shaft 25 of the cushion frame 20. One end of a link bar 62 (described later) that rotatably supports the side frame 41 by a third shaft 64 is connected to the other end side of the side frame 41 from the position where the side frame 41 is supported by the second shaft 25.

[0038] The seat slide 50 is disposed on a platform portion protruding upward (in the direction of arrow U) on the bottom surface Bd1 of the vehicle body Bd. The seat slide 50 supports the seat cushion 2 (seat cushion frame 20) slidably relative to the bottom surface Bd1 of the vehicle body Bd.

[0039] The seat slide member 50 includes a slide rail 51 fixed to the table portion of the bottom surface Bd1 and extending in the longitudinal direction, a slide portion 52 supported by the slide rail 51 so as to be slidable in the longitudinal direction on the slide rail 51, and a slide lock operation portion (not shown) capable of restricting and releasing the sliding movement of the slide portion 52. The lower surface 23 of the side frame 21 is fixed to the upper surface 52a of the slide portion 52.

[0040] The slide portion 52 includes a locking claw (not shown) that can be inserted into and out of a locking hole (not shown) formed in the slide rail 51. When the slide locking operation portion is not operated, the locking claw is inserted into the locking hole to restrict the sliding movement of the seat cushion 2 (seat cushion frame 20) relative to the vehicle body Bd. By operating the slide locking operation portion, the locking claw is released from the locking hole, so that the seat cushion 2 (seat cushion frame 20) can slide relative to the vehicle body Bd.

[0041] In this embodiment, the positions of the slide lock are the seat position, the working position, and the release position. The relative positions of the slide portion 52 with respect to the slide rail 51 at each position are as follows: in the seat position, the slide portion 52 is located at the rearmost position (arrow B direction) with respect to the slide rail 51 (refer to Fig. 8A ), in the relaxed position, the slide portion 52 is located at the frontmost position relative to the slide rail 51 (in the direction of arrow F) (refer to Figure 8C ), in the working position, the sliding portion 52 is located at a position between the seated position and the relaxed position relative to the slide rail 51 (refer to Figure 8B ).

[0042] The sliding plane 53 on which the seat cushion 2 (seat cushion frame 20) slides relative to the vehicle body Bd is inclined downward from the front side (arrow F direction) of the seat cushion frame 20 toward the rear side (arrow B direction). In the present embodiment, the angle θ1 of the downward inclination is set to 4°. The angle θ1 is an angle formed by the sliding plane 53 and the bottom surface Bd1 of the vehicle body Bd that does not include the platform. It should be noted that, with respect to the bottom surface Bd1 of the vehicle body Bd, the surface of the portion that does not include the platform is a plane that is orthogonal to the direction of gravity and is parallel to the flat ground.

[0043] By setting the angle θ1 to 4°, when the seat cushion 2 is slid from the front side (arrow F direction) to the rear side (arrow B direction), it can be easily slid to the rear side by utilizing the weight of the seat occupant. In addition, conversely, when the seat cushion 2 is slid from the rear side to the front side, it can be fully slid to the front side by utilizing the force transmitted to the seat cushion 2 using the weight of the seat occupant applied to the seat back 3 as a starting point. Therefore, the seat cushion 2 can be easily slid and moved, and the operability of the reclining operation can be improved. It should be noted that in the present embodiment, the angle θ1 is set to 4°, but it can also be less than 4°.

[0044] The link mechanism 60 includes a link bracket 61, one end of which is rotatably supported on the side frame 21 by the first shaft 24, and a link bar 62, which is rotatably supported on the other end of the link bracket 61 via a link shaft 63 and extends from the rear (arrow B direction) to the front (arrow F direction) of the vehicle seat 1. The link bar 62 is rotatably supported on the side frame 41 via a third shaft 64 on the side opposite to the link shaft 63. The side frame 37, the side frame 21, and the link bracket 61 are mutually supported in the order of the side frame 37, the side frame 21, and the link bracket 61 from the inside to the outside of the vehicle seat 1 via the first shaft 24.

[0045] The link bracket 61 is a plate-shaped steel member formed in a C-shape. The link bracket 61 is axially supported by the first shaft 24 on the side frame 21 so that the inner surface of one end side of the link bracket 61 faces the outer surface of the side frame 21. In a plan view, the link bracket 61 is bent from the outer surface of the side frame 21 toward the inner surface as it moves from one end side toward the other end side, and the other end side of the link bracket 61 is located at a position further inside than the side frame 21. The link bar 62 is axially supported on the other end side of the link bracket 61, so that the link bar 62 can be arranged at a position further inside than the side frame 21 and the seat slide 50 disposed below the side frame 21. As a result, it is possible to prevent the link bar 62 from protruding outward from the seat slide 50, and the size of the vehicle seat 1 in the left-right direction (arrow LR direction) can be reduced. Therefore, the vehicle seat 1 can be miniaturized.

[0046] When the vehicle seat 1 is between the seated position and the relaxed position, the upper (arrow U direction) side surface of the outer periphery 61a of the link bracket 61 on the side where the hinge pin 38 is disposed is Figure 4A ) is a straight line.

[0047] The link bar 62 is a member that transmits the force when the link bracket 61 rotates around the axis O1 of the first shaft 24 to the leg support frame 40 (side frame 41). The other end of the link bar 62 is axially supported by the link shaft 63 on the link bracket 61, and one end of the link bar 62 is axially supported by the third shaft 64 on the side frame 41. The link bracket 61 is axially supported by the first shaft 24 on the seat cushion frame 20 in a rotatable manner. Therefore, when a load is input (pressed) from the hinge pin 38 to the outer periphery 61a, a force in a vertical direction is applied to the surface on the upper side (in the direction of arrow U) of the outer periphery 61a, and in a side view (refer to FIG. 1 ), the outer periphery 61a is subjected to a force in a vertical direction. Figure 4A The link bracket 61 axially supports the link bar 62, so the load input to the link bracket 61 is transmitted in the direction in which the link bar 62 presses the side frame 41.

[0048] Reference Figure 4B The striker pin 70 will be described. Figure 4B is from Figure 4A A view of the backrest frame 30 viewed from the direction of arrow IVb. Figure 4B In FIG. 1 , the first reinforcing member 35 , the second reinforcing member 36 , the locking mechanism 39 , and the pipe 31 arranged in the cover 32 are omitted from illustration.

[0049] like Figure 4B As shown, the striker 70 is a steel member formed by bending a cylindrical rod into a substantially U-shape and fixed to the vehicle body Bd. The striker 70 includes: an insertion portion 71 extending from the wall portion Bd2 of the vehicle body Bd toward the cover 32; a connecting portion 72 that is continuous with the insertion portion 71 and extends from one end of the insertion portion 71 to the rear (in the direction of arrow B); and a non-insertion portion 73 that is continuous with the other end of the connecting portion 72 and extends from the other end toward the wall portion Bd2 of the vehicle body Bd. The insertion portion 71 and the non-insertion portion 73 are parallel to each other and are connected in the middle by the connecting portion 72.

[0050] When the vehicle seat 1 is between the seat position and the relaxed position, the striker 70 passes through the path formed between the first portion 35b1 and the sliding portion 36b and passes through the long hole 33a (see 9A to 9C ). At this time, the front end side of the insertion portion 71 inserted into the long hole 33a of the side portion 33 is located inside the cover 32. Regarding the connection portion 72, the portion on the side of the insertion portion 71 is located inside the cover 32, and the portion on the side of the non-insertion portion 73 protrudes from the long hole 34a of the upright setting portion 34 on the rear side (arrow B direction) to the outside of the cover 32. The non-insertion portion 73 is located outside the cover 32.

[0051] In the vehicle seat 1, since the seat back 3 is rotatably supported by the seat cushion 2, a striker 70 is inserted between the long hole 33a of the cover 32 provided on the seat back 3 (backrest frame 30), the first part 35b1 of the long hole 34a and the sliding part 36b, so that the part of the seat back 3 supported by the seat cushion 2 and the part of the seat back 3 inserted by the striker 70 are supported at two points, thereby enabling the seat back 3 to be tilted in the upright direction and in the rearward tilting direction, and the overall rigidity of the vehicle seat 1 can be improved.

[0052] 5 , the first cover 32a and the second cover 32b will be described. Figure 5A yes Figure 4A A cross-sectional view of the backrest frame 30 at the Va-Va line, Figure 5B yes Figure 4A It is a cross-sectional view of the backrest frame 30 at the Vb-Vb line. It should be noted that, Figure 5A The cross section is cut along a plane parallel to the bottom surface Bd1 of the vehicle body Bd. Figure 5B The cross section is cut along a plane perpendicular to the direction in which the left side portion 31c of the tube 31 extends. Figure 5B In the figure, the locking mechanism 39 is omitted.

[0053] like Figure 5A and Figure 5B As shown, the first cover 32a and the second cover 32b are formed into a C-shape when viewed in cross section. The first cover 32a includes: a side portion 33, which forms the outer surface of the left side (arrow L direction side) of the first cover 32a in the seated position; and a vertical setting portion 34, which is vertically set from both ends of the side portion 33 in the front-back direction (arrow FB direction) to the right side (arrow R direction side). The inner surface of the first cover 32a is composed of an inner surface 32a1 formed by the vertical setting portion 34 located on the front side (arrow F direction) of the vertical setting portion 34, an inner surface 32a2 formed by the side portion 33, and an inner surface 32a3 formed by the vertical setting portion 34 located on the rear side (arrow B direction) of the vertical setting portion 34.

[0054] The respective ends of the roughly C-shaped first cover 32a and the second cover 32b are joined by the outer surface of the end on one side of the first cover 32a and the inner surface of the end on one side of the second cover 32b, and by the inner surface of the end on the other side of the first cover 32a and the outer surface of the end on the other side of the second cover 32b.

[0055] A first reinforcing member 35, a second reinforcing member 36, and a locking mechanism 39 (see FIG. 1 ) are disposed in the inner space formed by the first cover 32a and the second cover 32b. Fig. 6A Since the cover 32 is composed of a plurality of components including the first cover 32a and the second cover 32b, the first reinforcing member 35, the second reinforcing member 36 and the locking mechanism 39 can be easily assembled in the inner space compared to a cover having a single cylindrical component.

[0056] The ends of the first cover 32a and the second cover 32b are joined in a staggered manner. Therefore, even if the dimensional accuracy of one of the first cover 32a and the second cover 32b is low, the position of the other cover can be adjusted and the two can be easily assembled.

[0057] The first cover 32a and the second cover 32b clamp the outer peripheral surface of the end portion 31a of the tube 31 with the inner surfaces of their lower ends (see Figure 5B ). Therefore, the load received by the first cover 32a and the second cover 32b can be dispersed to the end portion 31a on one side. As a result, the strength of the first cover 32a and the second cover 32b can be improved.

[0058] The long hole 33a is formed into a shape extending in the up-down direction (arrow UD direction). The first reinforcing member 35 is arranged on the inner surface 33a1 of the front side (arrow F direction) and the inner surface of the upper side (arrow U direction) of the long hole 33a extending in the up-down direction, and the second reinforcing member 36 is arranged on the inner surface 33a2 of the rear side (arrow B direction) of the long hole 33a extending in the up-down direction. When the vehicle seat 1 is located between the seat position and the relaxed position, the space between the first portion 35b1 (described later) of the first reinforcing member 35 and the sliding portion 36b (described later) of the second reinforcing member 36 forms a path for the striker 70 to pass through (refer to FIG. 9 ).

[0059] A slit 33b is formed at the lower end of the long hole 33a. The slit 33b is connected to the long hole 33a and extends from the connected portion toward the upright portion 34 on the rear side (arrow B direction) of the cover 32 (first cover 32a) and opens at the upright portion 34. The width L3 of the slit 33b (see Figure 4A ) is set to be larger than the facing distance L2 between the first portion 35b1 of the first reinforcing member 35 and the sliding portion 36b of the second reinforcing member 36 described later. The facing distance L2 is set to be larger than the size L1 of the outer diameter of the striker 70 (refer to Figure 4B ) is larger.

[0060] Since the facing distance L2 is set larger than the size L1 of the outer diameter of the striker 70, when the striker 70 passes between the first portion 35b1 and the sliding portion 36b, only one of the first portion 35b1 and the sliding portion 36b can bear the contact with the striker 70. Therefore, the striker 70 can easily slide between the first portion 35b1 and the sliding portion 36b.

[0061] In addition, the width L3 is set to be larger than the opposing distance L2 and is set to be sufficiently larger than the size L1 of the outer diameter of the striker 70, so that when the vehicle seat 1 is between the seated position and the relaxed position, the striker 70 can be easily inserted into the long hole 33a from the opening of the slit 33b at any position.

[0062] The vertical setting part 34 on the rear side (arrow B direction) is formed with a long hole 34a, which extends in the up-down direction (arrow UD direction) and forms a path for the striker 70 to pass through when the seat back 3 is in the state between the seat position and the relaxed position. A slit 34b is formed at the lower end of the long hole 34a, which is connected to the long hole 34a, extends from the connecting portion toward the side surface part 33 of the cover 32 (first cover 32a), opens at the side surface part 33 and is connected to the slit 33b. The width L4 of the long hole 34a is set to be larger than the opposing distance L2 between the first part 35b1 and the sliding part 36b. The width L5 of the slit 34b is set to be substantially the same as the width L3 of the slit 33b.

[0063] Since the width L4 of the long hole 34a is set larger than the opposing distance L2, when the striker 70 passes through between the first portion 35b1 and the sliding portion 36b, it is difficult for the striker 70 to abut against the inner surface of the long hole 34a. Therefore, it is difficult for the first cover 32a to be damaged due to the striker 70 abutting against the inner surface of the long hole 34a.

[0064] In addition, the width L5 is set to be substantially the same as the width L3 and is set to be sufficiently larger than the outer diameter L1 of the striker 70, so that the striker 70 can be easily inserted into the long hole 34a from the opening of the slit 34b at any position when the vehicle seat 1 is between the seated position and the relaxed position.

[0065] Refer to Figure 5 and Fig. 6A , the locking mechanism 39 is described. Fig. 6A yes Figure 5A VIa-VIa line of the backrest frame 30. The backrest frame 30 includes a locking mechanism 39 disposed on the first cover 32a. When the vehicle seat 1 is in a state between the seat position and the relaxed position, the locking mechanism 39 is configured to be switchable between a locked state in which a portion of the surface on which the striker 70 slides is formed and an unlocked state in which the portion is not formed.

[0066] The locking mechanism 39 includes: a hook-shaped claw 39a; a shaft portion 39b that pivotally supports the claw 39a so as to be rotatable relative to the first cover 32a; and a locking operation portion (not shown) that is operated by the seat occupant to switch between a locked state and an unlocked state.

[0067] The contact surface 39a1 of the claw 39a, which is the surface on the side that the striker 70 contacts when the vehicle seat 1 is between the seated position and the relaxed position, is arranged at the communicating portion between the long hole 33a and the slit 33b. At this time, the contact surface 39a1 is located on the substantially extended line of the surface on the side that the striker 70 slides of the sliding portion 36b. The contact surface 39a1 and the rear surface 39a2, which is the surface on the opposite side to the contact surface 39a1, form a substantially triangular front end portion.

[0068] Since the contact surface 39a1 is located substantially on the extension line of the surface of the sliding portion 36b on the side where the striker 70 slides when the vehicle seat 1 is between the seated position and the relaxed position, the striker 70 can slide well between the sliding portion 36b and the contact surface 39a1 (hard to get caught). Therefore, the operability of the seat back 3 when tilting in the upright direction and in the rearward tilting direction can be improved.

[0069] The shaft portion 39 b passes through the shaft hole 35 g of the first reinforcing member 35 , penetrates the first cover 32 a , and is rotatable relative to the first reinforcing member 35 and the first cover 32 a .

[0070] The shaft portion 39b is provided with a front end portion of the pawl 39a which is directed in the rotation direction (ie, toward the lock restricting portion 36g) Fig. 6A The front end of the claw 39a is brought into contact with the lock limiting portion 36g of the second reinforcing member 36, thereby limiting further rotation of the claw 39a.

[0071] In the locked state of the lock mechanism 39 , the claw 39 a blocks the communication portion between the long hole 33 a and the slit 33 b (see FIG. 9 ), thereby preventing the striker 70 from passing through the slit 33 b and being pulled out of the cover 32 .

[0072] When the lock mechanism 39 is unlocked, the connecting portion between the long hole 33a and the slit 33b is opened by the claw 39a (see Fig. 10A ), so the striker 70 can pass through the slits 33b and 34b and be pulled out from the cover 32. Therefore, in order to release the lock of the locking mechanism 39, the seat back 3 can be folded down by simply folding down the seat back 3 while operating the locking operation portion. Therefore, the operability during the folding action can be improved.

[0073] Reference Figure 6B , describing the relationship between the abutment surface 39 a 1 of the lock mechanism 39 and the load W input from the striker 70 to the lock mechanism 39 . Figure 6B Schematic diagram showing the relationship between the lock mechanism 39 and the load W input to the striker 70 .

[0074] The axis O1 indicates the axis (first axis 24) of the seat back 3 rotatably supported by the seat cushion 2, the axis O2 indicates the axis of rotation of the claw 39a relative to the first cover 32a, and the contact point P1 indicates the contact point where the striker 70 contacts the contact surface 39a1 of the claw 39a of the locking mechanism 39 when the vehicle seat 1 is in the seated position. In addition, the virtual circle C1 is a virtual circle passing through the contact point P1 with the axis O1 as the center, and the virtual circle C2 is a virtual circle passing through the contact point P1 with the axis O2 as the center. The arrow Rο indicates the direction in which the claw 39a rotates in the unlocking direction at the contact point P1.

[0075] Regarding the locking mechanism 39, when the vehicle seat 1 is in the seated position, the striker 70 is fixed to the wall portion Bd2 of the vehicle body Bd. Therefore, when a load in the direction of tilting the seat back 3 (backrest frame 30) forward is applied, a load W is input to the striker 70 in the direction opposite to the direction of tilting the seat back 3 forward and in the direction of the tangent to the imaginary circle C1. Since the striker 70 abuts against the abutment surface 39a1 at the abutment point P1, the load W is decomposed into a component in the normal direction from the abutment point P1 to the abutment surface 39a1 and a component in the parallel direction. When viewed in the axial direction of the axis O1, the angle formed by the surface of the abutment surface 39a1 on the upper side (the arrow U direction side) than the abutment point P1 and the direction in which the load W is input is an angle greater than 45° and less than 135°. In this case, the component in the normal direction of the load W is larger than the component in the parallel direction. In the present embodiment, regarding the locking mechanism 39, the angle θ2 formed by the direction of the arrow Rο that rotates the claw 39a in the unlocking direction and the component force W1 is approximately 90°. It should be noted that in the present embodiment, θ2 is approximately 90°, but in addition, the angle θ2 may also be an obtuse angle (90°<θ2<180°).

[0076] Since the angle θ2 formed by the component force W1 and the direction (arrow Ro) for rotating the locking mechanism 39 is set to be approximately 90°, even if the load W is input from the striker 70 to the abutment surface 39a1 in the rotation direction of the axis O1 of the first shaft 24, the component force W1 can be made difficult to act in the direction of the arrow Rο. Therefore, it is possible to make it difficult for the claw 39a to rotate in the direction for unlocking. As a result, it is possible to make it difficult to unlock the locking mechanism 39 with respect to the load input from the rear (arrow B direction) to the front (arrow F direction) of the seat back 3 in the seated position.

[0077] 7 , the first reinforcing member 35 and the second reinforcing member 36 will be described. Fig. 7A is a perspective view of the first reinforcing member 35, Figure 7B 3 is a perspective view of the second reinforcing member 36 .

[0078] like Fig. 7A As shown, the first reinforcing member 35 is a steel member, and includes a flat plate-shaped base 35a and a sliding portion 35b vertically provided from the base 35a. That is, the base 35a is vertically provided from the sliding portion 35b. The base 35a is provided with an axial hole 35g for rotatably supporting the shaft 39b of the locking mechanism 39. The end surface 35c of the base 35a on the side opposite to the side on which the sliding portion 35b is vertically provided is formed in a shape corresponding to the inner surface 32a1 of the first cover 32a, and abuts against the inner surface 32a1 (see FIG. 1 ). Fig. 6A ).

[0079] The sliding portion 35b includes: a first portion 35b1 extending parallel to the direction in which the striker 70 slides when the vehicle seat 1 is between the seated position and the relaxed position; a second portion 35b2 bent from one end of the first portion 35b1 and extending in a direction orthogonal to the first portion 35b1; a first abutting portion 35d extending from the other end of the first portion 35b1 along the outer edge of the base 35a; and a second abutting portion 35e extending from the second portion 35b2 along the outer edge of the base 35a. The first abutting portion 35d and the second abutting portion 35e abut against the inner surface 32a2.

[0080] The lengths of the first abutting portion 35d and the second abutting portion 35e extending vertically from the base portion 35a are shorter than the lengths of the first portion 35b1 and the second portion 35b2 extending vertically from the base portion 35a.

[0081] The first portion 35b1 is formed into a shape corresponding to the inner surface 33a1 on the front side (arrow F direction) of the long hole 33a, and the second portion 35b2 is formed into a shape corresponding to the inner surface on the upper side (arrow U direction) of the long hole 33a. The first portion 35b1 is in contact with the inner surface 33a1 (see Figure 5A , Fig. 6A 9). When the vehicle seat 1 is between the seat position and the relaxed position, the first portion 35b1 is a portion for the striker 70 to slide when the seat back 3 is tilted in the upright direction. It should be noted that when the vehicle seat 1 is between the seat position and the relaxed position and the seated person leans on the seat back 3, the first portion 35b1 is also a portion for the striker 70 to slide when the seat back 3 is tilted in the rearward tilting direction. In addition, depending on the direction of the load applied to the seat back 3, either the first portion 35b1 or the sliding portion 36b can become a portion that slides relative to the striker 70.

[0082] Since the end surface 35c of the first reinforcing member 35 abuts against the inner surface 32a1, when the seat back 3 is tilted in the upright direction, the load input from the striker 70 to the first portion 35b1 is sequentially transmitted to the first portion 35b1, the end surface 35c of the base 35a, and the inner surface 32a1 of the first cover 32a, thereby dispersing the load. As a result, the strength of the first reinforcing member 35 and the first cover 32a can be improved.

[0083] The first portion 35b1 of the first reinforcing member 35 abuts against the inner surface 33a1, so when the seat back 3 is tilted in the upright direction, the load input from the striker 70 to the first portion 35b1 is transmitted from the first portion 35b1 to the inner surface 33a1 of the long hole 33a, thereby dispersing the load. As a result, the strength of the first reinforcing member 35 can be improved.

[0084] like Figure 7B As shown, the second reinforcing member 36 is a steel member, and includes a flat plate-shaped base portion 36a and a sliding portion 36b provided perpendicularly from the base portion 36a. That is, the base portion 36a is provided perpendicularly from the sliding portion 36b.

[0085] The base 36a has a tube hole 36h formed therein, through which the end 31b of the upper portion 31f of the tube 31 is inserted and joined to the upper portion 31f. Therefore, the load input to the second reinforcing member 36 is transmitted to the tube 31, thereby dispersing the load. As a result, the strength of the second reinforcing member 36 can be improved.

[0086] The base 36a is also provided with a lock limiting portion 36g on the side opposite to the side on which the sliding portion 36b is provided vertically. The lock limiting portion 36g is a portion against which the front end of the claw 39a of the locking mechanism 39 abuts, thereby limiting the rotation of the claw 39a caused by the force of the spring 39b1. A recessed portion 36e is formed in the central portion of the base 36a, which is recessed in the direction in which the sliding portion 36b is provided vertically. The recessed portion 36e is a portion that suppresses the base 36a from bending due to the load received in the direction from the sliding portion 36b toward the base 36a.

[0087] When the vehicle seat 1 is between the seated position and the relaxed position, the sliding portion 36b extends parallel to the direction in which the striker 70 slides. The end surface 36c of the base 36a opposite to the side on which the sliding portion 36b is vertically provided is formed in a shape corresponding to the inner surface 32a3 of the first cover 32a and abuts against the inner surface 32a3 (see FIG. Fig. 6A ).

[0088] The sliding portion 36b is formed in a shape corresponding to the inner surface 33a2 on the rear side (the direction of the arrow symbol B) of the long hole 33a, and abuts against the inner surface 33a2 (see Figure 5A , Fig. 6A 9 ). The sliding portion 36 b is a portion on which the striker 70 slides when the seat back 3 is tilted in the rearward tilting direction when the vehicle seat 1 is in the state between the seat position and the relaxed position.

[0089] Since the end face 36c of the second reinforcing member 36 abuts against the inner surface 32a3, when the seat back 3 tilts in the rearward tilting direction, the load input from the striker 70 to the sliding portion 36b is transmitted in the order of the sliding portion 36b, the end face 36c of the base 36a, and the inner surface 32a3 of the first cover 32a, thereby dispersing the load. As a result, the strength of the second reinforcing member 36 and the first cover 32a can be improved.

[0090] Since the sliding portion 36b of the second reinforcing member 36 abuts against the inner surface 33a2, when the seat back 3 tilts in the rearward tilting direction, the load input from the striker 70 to the sliding portion 36b is transmitted from the sliding portion 36b to the inner surface 33a2 of the long hole 33a, thereby dispersing the load. As a result, the strength of the second reinforcing member 36 can be improved.

[0091] The first reinforcing member 35 and the second reinforcing member 36 are welded to each other at the welding portions 35f and 36f (see Figure 5B and Fig. 6A ). Therefore, the load input to either side of the first reinforcing member 35 or the second reinforcing member 36 can be transmitted to the other side of the first reinforcing member 35 or the second reinforcing member 36, thereby dispersing the load. As a result, the strength of the first reinforcing member 35 and the second reinforcing member 36 can be improved.

[0092] Next, the linkage operation of the vehicle seat 1 (seat frame 10) will be described with reference to FIG. 8 and FIG. 9 . Fig. 8A is a schematic diagram of the seat frame 10 in the seated position, Figure 8B is a schematic diagram of the seat frame 10 in the working position, Figure 8C FIG. 8 is a schematic diagram of the seat frame 10 in the relaxed position. Figure 4A The same direction ( Figure 2 Schematic diagram of the seat frame 10 observed by arrow IVa). Fig.9A is a side view of the cover 32 in the seated position, Fig. 9B is a side view of the cover 32 in the working position, Fig. 9C Fig. 9 is a side view of the cover 32 in the relaxed position. Fig. 9 is a view for explaining the cover 32 portion in the seated position, the operating position, and the relaxed position of Fig. 8 .

[0093] It should be noted that, for ease of explanation, FIG. 9 illustrates the manner in which the vehicle seat 1 moves from the seated position to the relaxed position (i.e., the manner in which the striker 70 slides between the claw 39a and the sliding portion 36b), but when moving from the relaxed position to the seated position, the striker 70 slides in the first portion 35b1.

[0094] First, the sequence of moving the vehicle seat 1 from the seated position to the relaxed position is described. It should be noted that the movement from the seated position to the working position and the movement from the relaxed position to the working position are the same as the movement from the seated position to the relaxed position and the movement from the relaxed position to the seated position, so the movement from the seated position to the relaxed position and the movement from the relaxed position to the seated position are described, and the description of the movement in the position between them, that is, the working position, is omitted.

[0095] As shown in Fig. 8 and Fig. 9, in the seated position, the seat occupant releases the slide lock and slides the cushion frame 20 (seat cushion 2) to the front side (in the direction of arrow F). Since the striker 70 is inserted through the backrest frame 30 (seat back 3), the seat back 3 moves while the sliding portion 36b and the claw 39a of the second reinforcement member 36 abut against the striker 70. Due to the force received by the sliding portion 36b and the claw 39a from the striker 70, the seat back 3 tilts in the rearward tilting direction with the axis O1 of the first shaft 24 as the center.

[0096] It should be noted that, at this time, when the seat occupant leans back in a manner of pressing the seat back 3 backward (in the direction of arrow B), the seat back 3 is supported by the striker 70, so that the portion of the seat back 3 supported by the first shaft 24 is pressed forward. Therefore, the seat cushion 2 can be easily slid forward. As a result, the operability of the reclining operation can be improved.

[0097] When the vehicle seat 1 is between the seated position and the relaxed position, the center of gravity of the seat back 3 is located at a position further rearward (in the direction of arrow B) than the axis O1 of the first shaft 24, and the surface on the upper side (in the direction of arrow U) of the outer periphery 61a of the link bracket 61 is located below the hinge pin 38 (in the direction of arrow D). Therefore, the hinge pin 38 is brought into contact with the surface on the upper side (in the direction of arrow U) of the outer periphery 61a of the link bracket 61 due to the own weight of the backrest frame 30.

[0098] When the seat back 3 tilts in the rearward tilting direction, the hinge pin 38 presses the upper (arrow U direction) side surface of the outer periphery 61a of the link bracket 61 downward (arrow D direction). The link bracket 61 pressed by the hinge pin 38 moves in the direction of pressing the link bar 62 (in the direction of the arrow D) with the axis O1 of the first shaft 24 as the center. FIG. 8A to FIG. 8C The link bar 62 pressed by the link bracket 61 is pressed in a direction of pressing the leg support frame 40 (side frame 41) to the front side (arrow F direction) while adjusting the angle by the link shaft 63. The hinge pin 38, link bracket 61, link bar 62 and link shaft 63 are arranged in a pair in the left-right direction (arrow LR direction) and have the same structure and the same operation.

[0099] The side frame 41 and the connecting rod 62 of the leg rest frame 40 are axially supported by the third axis 64, and one end of the side frame 41 and the seat cushion frame 20 (seat cushion 2) are axially supported by the second axis 25. Therefore, the leg rest 4 is rotated relative to the seat cushion 2 around the second axis 25 (clockwise in Figure 8) and tilted in a direction extending forward (in the direction of arrow F).

[0100] Next, the sequence of moving the vehicle seat 1 from the relaxed position to the seated position will be described. As shown in FIGS. 8 and 9 , in the relaxed position, the seat occupant stands up from the position where the backrest is leaning against the backrest frame 30 (seat back 3), and at the same time, operates the slide lock operation portion of the seat slide member 50, thereby releasing the slide lock. At this time, the seat cushion 2 slides and moves to the rear side (in the direction of arrow B) due to the weight shift caused by the change in the posture of the seat occupant. Since the striker 70 is inserted through the seat back 3, the seat back 3 moves while the first portion 35b1 of the first reinforcement member 35 abuts against the striker 70. Due to the force received by the first portion 35b1 from the striker 70, the seat back 3 tilts in the standing direction with the axis O1 of the first shaft 24 as the center.

[0101] If the seat back 3 tilts in the upright direction, the hinge pin 38 moves in a retracting manner in a direction separated from the surface on the upper side (in the direction of arrow U) relative to the outer periphery 61a of the link bracket 61. The engagement between the hinge pin 38 and the link bracket 61 is released, and the force of the link bar 62 pressing the leg support frame 40 (side frame 41) is released. At this time, the leg support frame 40 tilts in the backward direction due to its own weight. Since the leg support frame 40 tilting in the backward direction presses the link bar 62 to the rear side (in the direction of arrow B), the link bracket 61 moves in the direction of returning the link bar 62 (in the direction of arrow B) with the axis O1 of the first shaft 24 as the center. FIG. 8A to FIG. 8C The hinge pin 38 rotates counterclockwise.

[0102] Next, the folding operation of the vehicle seat 1 (seat frame 10 ) will be described with reference to FIG. 10 . Fig. 10A is a side view of the seat frame 10 in the unlocked state, Fig. 10B It is a side view of the seat frame 10 in the folded state.

[0103] First, the operation of bringing the backrest frame 30 (seat back 3) from the seated position to the reclining state will be described. Fig. 10A As shown in FIG. 1 , when the vehicle seat 1 is in the seated position, the striker 70 is located at the portion where the long holes 33a and 34a communicate with the slits 33b and 34b. When the locking operation portion of the locking mechanism 39 is operated, the claw 39a rotates in a direction away from the communicating portion where the long holes 33a and the slits 33b communicate, and the communicating portion blocked by the claw 39a (see FIG. 1 ) is closed. Fig.9A Since the communicating portion is opened, the striker 70 can be pulled out from the cover 32.

[0104] At this time, the slits 33b and 34b are set at an angle so that the inner sides of the slits 33b and 34b of the cover 32 (first cover 32a) do not interfere with each other even when the seat back 3 is rotated in the direction of tilting forward around the axis O1. Therefore, the seat back 3 can be rotated in the direction of tilting forward from the seat position around the axis O1.

[0105] like Fig. 10B As shown, the vehicle seat 1 is Fig. 10A With regard to the vehicle seat 1, in the folding operation, the hinge pin 38 is disposed at a position separated from the surface on the upper side (in the direction of arrow U) of the link bracket 61, and no other components are disposed on the track where the seat back 3 and the hinge pin 38 are tilted forward more than the seat position, so that the engagement between the hinge pin 38 and the link bracket 61 can be released to tilt the seat back 3 further forward than the seat position.

[0106] Next, the operation of returning the seat back 3 from the folded state to the seat position will be described. When the seat back 3 is tilted in the rearward tilting direction with the axis O1 as the center, the rear surface 39a2 of the claw 39a of the locking mechanism 39 abuts against the striker 70 at a position slightly before the seat position. When the seat back 3 is further tilted in the rearward tilting direction from this state, the claw 39a retreats from the communicating portion where the long hole 33a and the slit 33b communicate, and the striker 70 is inserted into the long hole 33a. Thereafter, the claw 39a is urged by the spring 39b1 to return to the locked state where the communicating portion where the long hole 33a and the slit 33b communicate is blocked.

[0107] At this time, at the contact point where the rear surface 39a2 contacts the striker 70, the angle formed by the direction in which the striker 70 moves relative to the seat back 3 toward the rear surface 39a2 of the locking mechanism 39 and the portion of the rear surface 39a2 that is lower than the contact point (in the direction of arrow D) is set to an acute angle (greater than 0° but less than 90°). In this case, at the contact point, the load input from the striker 70 can be directed toward the arrow Rο direction of the locking mechanism 39 (the direction in which the claw 39a rotates). Therefore, when the seat back 3 is returned to the seat position from the reclining state, it is not necessary to operate the locking operation part of the locking mechanism 39. Therefore, the operability can be improved.

[0108] As mentioned above, although the present invention has been described based on the embodiment, the present invention is not limited to the above-mentioned embodiment, and it can be easily estimated that various improvements and modifications can be made without departing from the scope of the present invention.

[0109] In this embodiment, the vehicle seat 1 can be folded down, but it can also be a vehicle seat that cannot be folded down. In this case, the hinge pin 38 is inserted into the long hole provided in the link bracket 61 so that the engagement with the link bracket 61 is not released, and is supported in a slidable manner.

[0110] In the present embodiment, the case where the striker 70 is in a U-shape has been described, but the striker 70 may be in an I-shape.

[0111] In the present embodiment, the striker 70 is described as being pulled out from the long holes 33a and 34a through the slits 33b and 34b, but the striker 70 may be pulled out from the cover 32 in the direction toward the wall portion Bd2 of the vehicle body Bd (in the direction of Figure 4B The machine moves backward (in the direction of arrow L) and is pulled out.

[0112] In this embodiment, the seat cushion 2 side (seat slide 50) is provided with a mechanism for sliding and locking the vehicle seat 1, but the seat back 3 or the leg rest 4 may also be provided with a locking mechanism for restricting the sitting position, the working position, and the relaxing position.

[0113] In the present embodiment, the case where only one position (operating position) is provided for slide locking between the seat position and the release position of the vehicle seat 1 is described, but a plurality of positions may be provided, or both the seat position and the release position may be provided.

[0114] In the present embodiment, the sliding plane 53 on which the seat cushion 2 slides is described as being inclined downward from the front side (arrow F direction) toward the rear side (arrow B direction) of the seat cushion frame 20, but the sliding plane 53 may be a plane orthogonal to the gravity direction.

[0115] In the present embodiment, the case where the first reinforcing member 35 and the second reinforcing member 36 are provided has been described, but either or both of the first reinforcing member 35 and the second reinforcing member 36 may be omitted.

[0116] In the present embodiment, the first reinforcing member 35 and the second reinforcing member 36 are described as being different members, but they may be a single member. Explanation of symbols

[0117] 1…Seats for transportation 2… Seat cushion 3…Seat back 4…Leg support 32…Hood 32a1, 32a2, 32a3…Inner surface 33a, 34a...long hole (first path) 33b, 34b...slit (second path) 35…first reinforcement member 35a ...base (first vertically disposed portion) 35b1…first part (first sliding part) 35c…end face 36 ... second reinforcement member 36a ...base (second vertically disposed portion) 36b... sliding portion (second sliding portion) 36c…end face 38…Hinge pin (engagement part) 39…Locking mechanism 39a ... claw (second sliding portion) 53…Sliding plane (plane) 60...Linkage mechanism (linkage unit) 61…Connecting rod bracket (connecting structure) 62…Connecting rod (connecting member) 63…Connecting rod shaft (connecting member) 70…Strike pin (linkage unit) Bd…vehicle body (vehicle body) θ1…angle.

Claims

1. A seat for a vehicle, characterized in that: The vehicle seat comprises: A seat cushion is slidably disposed on the bottom surface of the vehicle body; a seat back which is rotatably supported by the rear end side of the seat cushion and is configured to be tiltable relative to the seat cushion; as well as a leg rest which is rotatably supported by the front end side of the seat cushion and is configured to be tiltable relative to the seat cushion, The vehicle seat includes a linkage unit that links the sliding movement of the seat cushion, the tilting of the seat back, and the tilting of the leg rest. The linkage unit is configured to tilt the seat back in a rearward tilting direction and tilt the leg rest in a forward extending direction in linkage with the forward sliding movement of the seat cushion, and to tilt the seat back in an upright direction and tilt the leg rest in a backward retreating direction in linkage with the backward sliding movement of the seat cushion.

2. The vehicle seat according to claim 1, characterized in that: The plane on which the seat cushion performs the sliding movement is inclined downward from the front toward the rear.

3. The vehicle seat according to claim 2, characterized in that: The angle of the descending slope is less than 4°.

4. The vehicle seat according to claim 1, characterized in that: The linkage unit includes a striker disposed on the vehicle body and a guide unit disposed on the seat back and guiding the seat back to tilt relative to the striker.

5. The vehicle seat according to claim 4, characterized in that: The guide unit includes a cover formed in a hollow shape, and a first reinforcement member and a second reinforcement member provided on the cover. The first reinforcement member includes: a first sliding portion that can slide relative to the striker when the seat back is tilted; and a first vertically disposed portion that is vertically disposed from the first sliding portion toward the inner surface of the cover. The second reinforcement member includes: a second sliding portion that can slide relative to the striker when the seat back is tilted and is arranged opposite to the first sliding portion; and a second vertically arranged portion that is vertically arranged from the second sliding portion toward the inner surface of the cover. On the inner surface of the cover, surfaces of the first sliding portion and the second sliding portion opposite to the side on which the striker slides, an end surface of the first vertically disposed portion, and an end surface of the second vertically disposed portion are connected.

6. The vehicle seat according to claim 5, characterized in that: The seat back is tilted between a first position and a second position by the linkage of the linkage unit. The guiding unit comprises: a first path formed between the first sliding portion and the second sliding portion for the striker to pass through when the seat back is tilted between the first position and the second position; a second path, which is in communication with the first path and through which the striker passes when the seat back tilts forward from the first position; as well as a locking mechanism that is rotatably supported by the cover and includes a claw that forms at least a portion of the second sliding portion; The lock mechanism can switch between a locked state in which the pawl blocks communication between the first path and the second path and an unlocked state in which the first path and the second path are communicated with each other by rotating the pawl.

7. The vehicle seat according to claim 6, characterized in that: The first position is located closer to the standing direction of the seat back than the second position. The linkage unit has: a snap-fitting portion disposed on the seat back; and a connecting member, which is axially supported by the seat cushion, the seat back and the leg rest, respectively. When the seat back is located between the first position and the second position, the connecting member is disposed on the side of the engaging portion that causes the seat back to tilt in a rearward tilting direction, and the connecting member is not disposed on the side of the engaging portion that causes the seat back to tilt in an uprighting direction. Regarding the seat cushion and the leg rest, when the locking mechanism is in the unlocked state and the seat back is tilted from the first position to a position overlapping the seat cushion, no member for restricting the movement of the seat back and the engaging portion is provided on the track on which the seat back and the engaging portion move.

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