Vehicle seat

Abstract

To provide a vehicular seat with a pitching function that suppresses increase in a seat width and increase in seat weight while having an assisting function of enabling a main frame to take a seating posture or head forward posture.SOLUTION: A vehicular seat 1 includes: a base frame 21; a main frame 20 disposed on the base frame 21 and including a back frame 30 and a cushion frame 31; and a linkage mechanism 22 enabling the main frame 20 to swing relative to the base frame 21 and take a seating posture and a head forward posture. The linkage mechanism 22 includes a third rotation shaft 92 that is provided with a torsion spring 100 for biasing the main frame 20 in a direction of swinging to the seating posture from the head forward posture.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Some vehicle seats are equipped with a so-called pitching function that allows the entire seat body, including the seat back (backrest portion) and the seat cushion (seat portion), to be tilted forward (see Patent Document 1). With this pitching function, for example, even when a child seat is attached to the seat, the entire seat body can be tilted forward to allow an occupant to get into the rear seat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-197075 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a vehicle seat having the pitching function described above, a relatively strong force is required when the seat body is moved from a forward tilted position to a seated position or when the seat body is moved from a seated position to a forward tilted position due to the weight and center of gravity of the seat body. For this reason, it is preferable to have an assist function for moving the seat body to a seated position or a forward tilted position.

[0005] In this regard, the vehicle seat of Patent Document 1 is intended to suppress the locking delay of the seat lock mechanism, but is equipped with an assisting means that applies an assisting force to displace the main frame (including the back frame and the cushion frame), which is the skeleton of the seat body, from a forward tilted state to a seated state. However, this assisting means has a large-scale mechanism such as a coil spring that extends in the front-rear direction and a hook for fixing the coil spring, and further, the mechanism is disposed outside the fixed position of the slide device of the seat in the vehicle width direction. For this reason, the width of the vehicle seat is increased, and the space for getting into the rear row seat when the seat is tilted forward is narrowed. In addition, the weight of the seat is also increased, and further, it acts only in the direction of returning the seated state from the forward tilted state.

[0006] The present invention has been made in consideration of these points, and its object is to provide a vehicle seat with a pitching function that has an assist function for putting the main frame into a seated position or a forward-leaning position, while suppressing an increase in the width of the seat and suppressing an increase in the weight of the seat. [Means for solving the problem]

[0007] A vehicle seat according to one embodiment of the present invention comprises a base frame, a main frame arranged on the base frame and having a back frame and a cushion frame, and a link mechanism that enables the main frame to swing between a seated position and a forward-leaning position relative to the base frame, and at least one rotating shaft of the link mechanism is provided with a spring that biases the main frame in a direction to swing from the forward-leaning position to the seated position or in a direction to swing from the seated position to the forward-leaning position.

[0008] According to the above aspect, the spring provided on at least one rotating shaft of the link mechanism can bias the main frame in a direction of swinging from a forward-leaning position to a seated position or in a direction of swinging from a seated position to a forward-leaning position. Therefore, in a vehicle seat with a pitching function, it is possible to suppress an increase in the width of the seat and an increase in the weight of the seat while having an assist function of putting the main frame into a seated position or a forward-leaning position.

[0009] In the above aspect, a pair of link mechanisms may be provided on both the left and right sides of the main frame, and the springs may be provided on the pair of left and right rotating shafts of the link mechanisms, respectively.

[0010] In the above aspect, the base frame is located on both the left and right sides of the main frame and has slide rails for sliding the main frame in the forward and backward directions, and the spring is arranged at the same position as the slide rails when viewed from the front, or at a position more inward in the left-right direction than the slide rails.

[0011] The base frame has a first frame extending in the front-to-rear direction, the link mechanism has a cushion frame, a first frame, and a front link, the rear of the cushion frame and the rear of the first frame are connected via a first rotating shaft, the front of the cushion frame and the first end of the front link are connected via a second rotating shaft, and the front of the first frame and the second end of the front link are connected via a third rotating shaft, and the cushion frame may be configured to have a long hole that allows the first rotating shaft or the second rotating shaft to swing.

[0012] The spring may be provided at least at one location on the third rotating shaft or the first rotating shaft or the second rotating shaft not provided with the long hole. Effect of the Invention

[0013] According to the present invention, in a vehicle seat with a pitching function, it is possible to suppress an increase in the width and weight of the seat while having an assist function of putting the main frame into a seated position or a forward-leaning position. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing an example of a configuration of a vehicle seat. [Diagram 2] FIG. 2 is a perspective view showing an example of a skeleton of a vehicle seat. [Diagram 3] 2 is a side view showing an example of a skeleton of a vehicle seat when a main frame is in a seating position. FIG. [Figure 4] 1 is a side view showing an example of a skeleton of a vehicle seat when a main frame is in a forward tilted position. FIG. [Diagram 5] FIG. 4 is a perspective view showing a configuration around a torsion spring of the link mechanism. [Figure 6] 13 is a front view of the configuration around the torsion spring of the link mechanism. FIG. [Figure 7] FIG. 4 is a side view of the main frame in a seated position as viewed from the inside. [Figure 8] FIG. 11 is a side view of the main frame in a forward leaning position as viewed from the inside. [Figure 9] FIG. 11 is a side view showing a main frame of another link mechanism in a seated position. [Figure 10] FIG. 11 is a side view showing a main frame of another link mechanism in a forward tilted position. [Figure 11] FIG. 11 is a perspective view showing a skeleton of a vehicle seat of another link mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The same elements are given the same reference numerals, and duplicated descriptions will be omitted. Furthermore, unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the illustrated ratios. Furthermore, the following embodiments are examples for explaining the present invention, and the present invention is not limited to these embodiments.

[0016] 1 is a perspective view showing an example of the configuration of a vehicle seat 1 according to the present embodiment. For example, the vehicle seat 1 includes a seat cushion 10 on which an occupant sits, a back seat 11 on which the occupant leans back, a headrest 12 that supports the occupant's head, a seat belt device 13, and the like.

[0017] Fig. 2 is a perspective view showing an outline of the framework of the vehicle seat 1. The framework of the vehicle seat 1 includes, for example, a main frame 20, a base frame 21, a link mechanism 22 that allows the base frame 21 to swing relative to the main frame 20 between a seated posture and a forward leaning posture, and a lock mechanism 23. The seated posture refers to the posture in which an occupant normally sits (the posture as shown in Figs. 1 to 3).

[0018] The main frame 20 has a back frame 30 which corresponds to the skeleton of the seat back 11 , and a cushion frame 31 which corresponds to the skeleton of the seat cushion 10 .

[0019] The back frame 30 has, for example, a side frame 40, an upper connecting frame 41, and a lower connecting frame .

[0020] The side frames 40 are provided in pairs on both sides of the vehicle seat 1 in the left-right direction (vehicle width direction) X, and extend in the up-down direction. The side frames 40 have, for example, a plate shape that is long in the up-down direction and has a plate surface facing the left-right direction X. The upper connection frame 41 extends horizontally in the left-right direction X and connects the upper ends of the pair of side frames 40 to each other. The lower connection frame 42 extends horizontally in the left-right direction X and connects the lower parts of the pair of side frames 40 to each other.

[0021] The cushion frame 31 has, for example, a side frame 50 , a front connecting frame 51 , and a rear connecting frame 52 .

[0022] The side frames 50 are provided in pairs on both sides of the vehicle seat 1 in the left-right direction X, and extend in the front-rear direction Y of the vehicle seat 1 (the front-rear direction of the vehicle). As shown in Figs. 2 and 3, the side frames 50 have a plate shape that is long in the front-rear direction Y, for example, with the plate surface facing the left-right direction X. The side frames 50 have, for example, a vertical width that is approximately the same from the front to the middle, and a vertical width that widens from the middle to the rear. The side frames 50 have a shape that protrudes upward at the rear. A long hole 53 that penetrates in the left-right direction X and is long in the front-rear direction Y is formed in the rear of the side frames 50, and is used in the link mechanism 22.

[0023] 2, the front connecting frame 51 extends horizontally in the left-right direction X and connects the front portions of the pair of side frames 50. The rear connecting frame 52 extends horizontally in the left-right direction X and connects the rear portions of the pair of side frames 50.

[0024] The lower portion of the side frame 40 of the back frame 30 and the rear portion of the side frame 50 of the cushion frame 31 are rotatably connected by a rotation shaft 54 ​​facing in the left-right direction X. A reclining mechanism (not shown) is provided on the rotation shaft 54, and the back frame 30 can be tilted forward and backward with respect to the cushion frame 31 by this reclining mechanism.

[0025] The base frame 21 has a slide rail consisting of, for example, a lower rail 60 and an upper rail 61 , a riser 62 as a first frame, a front connecting frame 63 , and a rear connecting frame 64 .

[0026] The lower rails 60 are fixed to the floor surface of the vehicle. The lower rails 60 are provided in pairs on both sides in the left-right direction X of the vehicle seat 1, and extend linearly in the front-rear direction Y. The upper rails 61 are provided on the lower rails 60 so as to be slidable in the front-rear direction Y. The upper rails 61 have an elongated shape that is long in the front-rear direction Y.

[0027] The risers 62 are provided in pairs on both sides of the vehicle seat 1 in the left-right direction X, and have a plate shape that is long in the front-rear direction Y and has a plate surface facing the left-right direction X. The risers 62 have a vertical width that is wider at the front and rear parts than at the middle part. The risers 62 have a shape that protrudes upward at the front and rear parts. The risers 62 are located on the upper rail 61, and are fixed to the upper rail 61 by fixing members 65 such as bolts. The fixing members 65 are provided in two places, one in front of a third rotating shaft 92 (described later) of the link mechanism 22, and one between the third rotating shaft 92 and the first rotating shaft 90 in the front-rear direction Y, as shown in FIG. 3.

[0028] As shown in Fig. 2, the front connection frame 63 extends in the horizontal direction in the left-right direction X and connects the front parts of the pair of risers 62 to each other. The front connection frame 63 has, for example, a cylindrical shape. As shown in Fig. 3, the front connection frame 63 is provided between a third rotation shaft 92 (described later) and a first rotation shaft 90 of the link mechanism 22 in the front-rear direction Y, and at a position closer to the third rotation shaft 92. The front connection frame 63 also functions as a stopper that stops the side frame 50 of the cushion frame 31 when the side frame 50 is lowered by the link mechanism 22, that is, a stopper that stops the movement of the main frame 20 from the seated position to the forward leaning position.

[0029] 2, the rear connecting frame 64 extends horizontally in the left-right direction X and connects the rear portions of the pair of risers 62. The rear connecting frame 64 has a cylindrical shape with a larger diameter than the front connecting frame 63, for example.

[0030] A striker 66 is fixed to the rear connection frame 64 as a held member that is held by a hook 111 (described later) of the locking mechanism 23. The striker 66 is provided near both ends of the rear connection frame 64 in the left-right direction X. As shown in Figures 7 and 8, the striker 66 is configured to extend rearward from the rear connection frame 64, bend inward in the left-right direction X, and extend in the left-right direction X.

[0031] 2, the link mechanism 22 realizes a so-called pitching function, and is provided in a pair on both the left and right sides of the main frame 20. As shown in Fig. 3 and Fig. 4, the link mechanism 22 is, for example, a four-section slider link mechanism, and has a side frame 50 of the cushion frame 31, a riser 62, a front link 80, and a first rotation shaft 90 that moves within the long hole 53.

[0032] The rear portion 31b of the cushion frame 31 (side frame 50) and the rear portion 62b of the riser 62 are rotatably connected to each other via a first rotating shaft 90. The first rotating shaft 90 is provided in a long hole 53 of the cushion frame 31 so as to be able to swing freely. The front portion 31a of the cushion frame 31 and the first end portion 80a of the front link 80 are rotatably connected to each other via a second rotating shaft 91. The front portion 62a of the riser 62 and the second end portion 80b of the front link 80 are rotatably connected to each other via a third rotating shaft 92.

[0033] The link mechanism 22 is configured so that, when the front link 80 rotates forward (counterclockwise in Figs. 3 and 4) around the third rotation shaft 92 relative to the riser 62, the front part 31a of the cushion frame 31 moves forward and lowers, the first rotation shaft 90 moves rearward within the long hole 53, and the rear part 31b of the cushion frame 31 moves forward and rises, thereby causing the main frame 20 to assume a forward-leaning position (the state shown in Fig. 4). At this time, when the main frame 20 leans forward a predetermined amount, the cushion frame 31 comes into contact with the front connecting frame 63, and the forward-leaning movement of the main frame 20 is stopped.

[0034] In addition, the link mechanism 22 is configured such that, when the front link 80 rotates rearward (clockwise in Figures 3 and 4) around the third rotating shaft 92 relative to the riser 62, the front part 31a of the cushion frame 31 moves rearward and rises, the first rotating shaft 90 moves forward within the long hole 53, and the rear part 31b of the cushion frame 31 moves rearward and lowers, thereby returning the main frame 20 to the seated position (the state shown in Figure 3).

[0035] 5 and 6, the cushion frame 31 is located inside in the left-right direction X of the lower rail 60, the upper rail 61, and the riser 62. The front link 80 is disposed between the riser 62 and the cushion frame 31 in the left-right direction X.

[0036] A torsion spring 100 is provided on the third rotation shaft 92 of the riser 62, and biases the main frame 20 in a direction to swing from the forward tilted position to the seated position. The torsion spring 100 is wound around the third rotation shaft 92 between the riser 62 and the front link 80, with a first end 100a fixed to the riser 62 and a second end 100b fixed to the front link 80. When the main frame 20 moves to the forward tilted position, the front link 80 rotates forward about the third rotation shaft 92, and the biasing force of the torsion spring 100 becomes stronger. When the main frame 20 returns to the seated position, the movement is assisted by the biasing force of the torsion spring 100.

[0037] 2 is for fixing the main frame 20 to the base frame 21 in a seated position and releasing this fixing. A pair of locking mechanisms 23 are provided on both the left and right sides of the main frame 20. The locking mechanisms 23 are provided on the inside of the cushion frame 31 in the left-right direction X, for example, at the rear lower part of the cushion frame 31.

[0038] 7 and 8 are views of the cushion frame 31 as viewed from the inside in the left-right direction X. The locking mechanism 23 includes, for example, an unlocking member 110 that operates in conjunction with an unlocking lever (not shown), and a hook 111 that can be switched between a fixed state and a released state by the unlocking member 110.

[0039] The unlocking member 110 is configured to be rotatable, for example, in the front-rear direction Y of the cushion frame 31. The unlocking member 110 is biased toward the rear side of the cushion frame 31 by a spring 113. The locking mechanism 23 is configured such that, when the unlocking lever is moved, the unlocking member 110 moves forward, the fixed state of the hook 111 is released by the cam mechanism, and the hook 111 is released about the axis. As a result, when the main frame 20 is tilted forward, the hook 111 is pushed by the striker 66 in the opening direction (counterclockwise in Figs. 7 and 8) and rotates, and the striker 66 is disengaged from the hook 111 (the state shown in Fig. 8).

[0040] Furthermore, the lock mechanism 23 is configured such that, when the main frame 20 is tilted backward, the hook 111 is pushed and rotated in the closing direction (clockwise in Figs. 7 and 8) by the striker 66, and the striker 66 is held by the hook 111, at which point the hook 111 is in a fixed state (the state shown in Fig. 7). At this time, the unlocking member 110 is returned to its original position by the action of the spring 113.

[0041] 2, the seat belt device 13 is disposed inside the seat back 11, and includes a retractor 121 for winding up the seat belt 120, a belt inlet / outlet frame 122 for allowing the seat belt 120 to enter and exit from inside the seat back 11, and a buckle portion 123 for fastening the seat belt 120. The retractor 121 and the belt inlet / outlet frame 122 are attached to the upper portion of the back frame 30. The belt inlet / outlet frame 122 is provided, for example, near one end of the upper connection frame 41 in the left-right direction X. As shown in FIG. 1, the seat back 11 is provided with a belt inlet / outlet 124 at a position corresponding to the belt inlet / outlet frame 122.

[0042] Next, the operation of the pitching function of the vehicle seat 1 configured as above will be described. First, as shown in Fig. 3, the main frame 20 of the vehicle seat 1 is in a seated position, which is a normal position. At this time, as shown in Fig. 7, the hook 111 of the lock mechanism 23 on the main frame 20 side holds the striker 66 on the base frame 21 side, and the main frame 20 is locked in the seated position. In addition, a biasing force acts on the main frame 20 by the torsion spring 100, which tends to return the main frame 20 from the forward tilted position to the seated position.

[0043] When an occupant uses the pitching function of the vehicle seat 1, the occupant first moves the unlocking lever of the locking mechanism 23, which causes the unlocking member 110 to move forward, releasing the fixed state of the hook 111 and releasing the hook 111. Next, the occupant pushes the seat back 11 forward, causing the seat back 11 and the seat cushion 10 to tilt forward together. At this time, as shown in FIG. 8, the striker 66 is disengaged from the hook 111, and the main frame 20 is tilted forward relative to the base frame 21 by the link mechanism 22, as shown in FIG. 4, resulting in a forward tilting posture of the main frame 20. The forward tilt of the main frame 20 stops when the side frame 50 of the cushion frame 31 abuts against the front connecting frame 63. In this way, a space is created behind the seat back 11, allowing the occupant to get into the rear row seat, for example.

[0044] When the occupant returns the seat back 11 and the seat cushion 10 to their normal positions, the occupant pushes the seat back 11 backward, causing the main frame 20 to tilt backward relative to the base frame 21 as shown in FIG. 3. At this time, the torsion spring 100 applies a biasing force in a direction that swings the main frame 20 from the forward tilting position to the seated position, assisting the occupant in returning the seat back 11 and the seat cushion 10 (main frame 20) to the normal seated position. When the main frame 20 returns to the seated position, the striker 66 pushes the hook 111 of the locking mechanism 23, and the hook 111 rotates to hold the striker 66 as shown in FIG. 7. In this way, the main frame 20 is locked in the seated position again.

[0045] According to this embodiment, the torsion spring 100 provided on the third rotating shaft 92 of the link mechanism 22 can bias the main frame 20 in a direction that rocks it from a forward leaning position to a seated position. Therefore, in a vehicle seat 1 with a pitching function, it is possible to keep the width of the seat 1 small and the weight of the seat 1 small while having an assist function for returning the main frame 20 to the seated position.

[0046] Since the torsion springs 100 are provided on the pair of third rotating shafts 92 on the left and right sides of the link mechanism 22, respectively, assistance for returning the main frame 20 to the seated state can be performed in a well-balanced manner on both the left and right sides of the main frame 20.

[0047] Since the torsion spring 100 is provided at a position inside the lower rail 60 in the left-right direction X, it is possible to further reduce the lateral width of the vehicle seat 1. The torsion spring 100 may be provided at the same position as the lower rail 60 in a front view.

[0048] The link mechanism 22 has a cushion frame 31, a riser 62, and a front link 80, in which the rear part 31b of the cushion frame 31 and the rear part 62b of the riser 62 are connected via a first rotating shaft 90, the front part 31a of the cushion frame 31 and the first end part 80a of the front link 80 are connected via a second rotating shaft 91, and the front part 62a of the riser 62 and the second end part 80b of the front link 80 are connected via a third rotating shaft 92, and the cushion frame 31 is configured to have a long hole 53 that allows the first rotating shaft 90 to swing, and the torsion spring 100 is provided on the third rotating shaft 92. This makes it possible to realize a pitching function of the vehicle seat 1 with a small number of parts and excellent strength and rigidity. In addition, the assist function by the torsion spring 100 can be preferably realized.

[0049] In the present embodiment, the torsion spring 100 may be provided on the second rotating shaft 91. Furthermore, the torsion spring 100 may be provided on both the third rotating shaft 92 and the second rotating shaft 91.

[0050] In the present embodiment, the link mechanism 22 is provided with the long hole 53 in the cushion frame 31 to allow the first rotating shaft 90 to swing, but the link mechanism 22 may be provided with the long hole 53 in the front part 31a of the cushion frame 31 to allow the second rotating shaft 91 to swing, as shown in Fig. 9. In this case, the torsion spring 100 may be provided on at least either the third rotating shaft 92 or the first rotating shaft 90.

[0051] In this example, when the front link 80 rotates forward (counterclockwise in Figures 9 and 10) around the third rotating shaft 92 relative to the riser 62, the front part 31a of the cushion frame 31 moves forward and lowers, the second rotating shaft 91 moves toward the front side within the long hole 53, and the rear part 31b of the cushion frame 31 moves forward and rises, causing the main frame 20 to assume a forward-leaning position (the state shown in Figure 10).

[0052] In addition, when the front link 80 rotates rearward (clockwise in Figures 9 and 10) around the third rotating shaft 92 relative to the riser 62, the front part 31a of the cushion frame 31 moves rearward and rises, the second rotating shaft 91 moves toward the rear side within the long hole 53, and the rear part 31b of the cushion frame 31 moves rearward and lowers, thereby causing the main frame 20 to assume a seated position (the state shown in Figure 9).

[0053] In the above embodiment, the link mechanism 22 is a four-bar slider link mechanism, but is not limited to this and may be a link mechanism of another configuration. For example, the link mechanism 22 may be a four-bar link mechanism as shown in FIG. Such a link mechanism 22 has, for example, a cushion frame 31, a riser 62, a front link 80, and a rear link 140, and is configured such that a rear portion 31b of the cushion frame 31 and a first end portion of the rear link 140 are connected via a first rotating shaft 150, a second end portion of the rear link 140 and a rear portion 62b of the riser 62 are connected via a second rotating shaft 151, a front portion 31a of the cushion frame 31 and a first end portion 80a of the front link 80 are connected via a third rotating shaft 152, and a front portion 62a of the riser 62 and a second end portion 80b of the front link 80 are connected via a fourth rotating shaft 153, and the torsion spring 100 may be provided on at least one of the first rotating shaft 150 to the fourth rotating shaft 153.

[0054] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, the present invention is not limited to such an example. It is clear that a person skilled in the art can come up with various modified or altered examples within the scope of the ideas described in the claims, and it is understood that such examples also naturally belong to the technical scope of the present invention.

[0055] For example, the configurations of the main frame 20, the base frame 21, and the lock mechanism 23, and the configuration of the seat belt device 13 are not limited to those in the above embodiment, and may have other configurations. Also, the spring 100 may be something else as long as it biases the main frame 20 in a direction to swing from a forward tilting position to a seating position. Furthermore, in the above embodiment, the spring 100 biases the main frame 20 in a direction to swing from a forward tilting position to a seating position, but it may be something else that biases the main frame 20 in a direction to swing from a seating position to a forward tilting position. In this case, the configuration of the vehicle seat other than the spring 100 may be the same as that described in the above embodiment. [Industrial Applicability]

[0056] The present invention is useful in a vehicle seat with a pitching function, in which the main frame has an assist function for putting the main frame into a seated position or a forward-leaning position, while suppressing an increase in the width of the seat and an increase in the weight of the seat. [Explanation of symbols]

[0057] 1 Vehicle seat 10 Seat cushion 11 Seat back 20. Mainframe 21 Base Frame 22 Link mechanism 30 Back Frame 31 Cushion Frame 53 long hole 60 Lower rail 62 Riser 80 Front link 90 First Rotation Axis 91 Second Rotation Axis 92 Third Rotation Axis 100 Torsion Spring X Left / right direction Y Front-rear direction

Claims

1. A base frame; a main frame disposed on the base frame and having a back frame and a cushion frame; a link mechanism that enables the main frame to swing between a seated posture and a forward leaning posture relative to the base frame, The base frame has a first frame extending in a front-rear direction, the link mechanism has the cushion frame, the first frame, and a front link, a rear portion of the cushion frame and a rear portion of the first frame are rotatably connected by a first rotation shaft, a front portion of the cushion frame and a first end portion of the front link are connected via a second rotation shaft, and a front portion of the first frame and a second end portion of the front link are connected via a third rotation shaft, and a long hole is provided in the cushion frame to allow the first rotation shaft to swing; the first rotation shaft moves to the front of the elongated hole when in the seated position and moves to the rear of the elongated hole when in the forward leaning position; a spring is provided on at least one of the third rotation shaft and the second rotation shaft of the link mechanism to bias the main frame in a direction to pivot from a forward tilting posture to a seated posture or in a direction to pivot from the seated posture to a forward tilting posture, the base frame is located on both the left and right sides of the main frame and has slide rails for sliding the main frame in a front-rear direction, The spring is provided at a position more inward in the left-right direction than the slide rail.

2. The link mechanism is provided in pairs on both the left and right sides of the main frame, 2. The vehicle seat according to claim 1, wherein the spring is provided on at least one of a pair of left and right rotation shafts of the link mechanism, the third rotation shaft and the second rotation shaft.

Images