Suspension device for seat

Abstract

To provide a suspension device for a seat which enables reduction of friction resistance occurring between members.SOLUTION: Each of travel parts 50 included in a first link arm 30 and a second link arm 40 of a suspension device 10 includes: a shaft 51; an outer contact member 52; and an inner contact member 53A. The outer contact member 52 contacts with a rail 20 from one side in a vertical direction and the inner contact member 53A contacts with the rail 20 from the other side in the vertical direction. The outer contact member 52 is configured to roll relative to the rail 20 when the travel part 50 moves in a front-back direction along the rail 20. The travel part 50 includes a restriction part 53B which is provided in a manner that the restriction part 53B can contact with the rail 20 from the inner side in a seat width direction and restricts movement of the shaft 51 to the outer side in the seat width direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a suspension device for a seat. [Background technology]

[0002] Patent Document 1 discloses a suspension device for a seat. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-206635 Summary of the Invention [Problem to be solved by the invention]

[0004] In the suspension device described above, it is desirable to reduce the frictional resistance that occurs between the members.

[0005] An object of the present invention is to provide a seat suspension device that can reduce frictional resistance generated between members. [Means for solving the problem]

[0006] A seat suspension device of a first aspect includes a lower frame having a pair of rails, an upper frame having a pair of rails, and a link mechanism that supports the upper frame so as to be movable up and down relative to the lower frame, the link mechanism having a first link arm configured to be rotatable about an axis in the seat width direction relative to the lower frame, and a second link arm configured to be rotatable about an axis in the seat width direction relative to the upper frame, the first link arm having a pair of first running portions that can run along the pair of rails of the upper frame, the second link arm having a pair of second running portions that can run along the pair of rails of the lower frame, At least one of the pair of first running portions and the pair of second running portions comprises a shaft, an outer contact member rotatably attached to the shaft and contacting the rail from one side in the vertical direction, the outer contact member being configured to roll against the rail when the running portion moves in the front-to-rear direction along the rail, an inner contact member attached to the shaft at a position more inward in the seat width direction than the outer contact member and contacting the rail from the other side in the vertical direction, and a regulating portion configured to be able to contact the rail from the inner side in the seat width direction and thereby regulating movement of the shaft outward in the seat width direction.

[0007] In this aspect, the seat suspension device includes a lower frame, an upper frame, and a link mechanism. The link mechanism supports the upper frame so that the upper frame is vertically movable relative to the lower frame.

[0008] In this aspect, the lower frame and the upper frame each have a pair of rails. The link mechanism has a first link arm configured to be rotatable about an axis in the seat width direction relative to the lower frame and a second link arm configured to be rotatable about an axis in the seat width direction relative to the upper frame. The first link arm has a pair of first running portions that can run along the pair of rails of the upper frame, and the second link arm has a pair of second running portions that can run along the pair of rails of the lower frame. Therefore, when the upper frame moves up and down relative to the lower frame, the first link arm rotates about an axis in the seat width direction relative to the lower frame, and the second link arm rotates about an axis in the seat width direction relative to the upper frame. The pair of first running portions of the first link arm run along the pair of rails of the upper frame, and the pair of second running portions of the second link arm run along the pair of rails of the lower frame.

[0009] In this aspect, at least one of the pair of first running portions and the pair of second running portions includes a shaft, an outer contact member, and an inner contact member. The outer contact member and the inner contact member are both attached to the shaft, and the outer contact member contacts the rail from one side in the vertical direction, while the inner contact member contacts the rail from the other side in the vertical direction. This prevents the running part from rattling up and down relative to the rail.

[0010] In this aspect, the outer contact member is rotatable relative to the shaft, so that the outer contact member is configured to perform a rolling motion relative to the rail when the running portion moves back and forth along the rail. This reduces friction between the outer contact member and the rail when the traveling portion travels.

[0011] However, when the shaft moves outward in the seat width direction, it may become difficult for the outer contact member to rotate. Specifically, for example, the outer contact member may be sandwiched between the shaft and the rail in the seat width direction, making it difficult for the outer contact member to rotate. Even if the outer contact member is not sandwiched between the shaft and the rail, a force may be transmitted from the shaft to the inner contact member outward in the seat width direction, making it difficult for the outer contact member to rotate because the outer contact member is sandwiched between the inner contact member and the rail in the seat width direction. When the outer contact member becomes difficult to rotate, the resistance friction generated between the outer contact member and the rail increases. Therefore, in this aspect, the at least one running portion includes a restricting portion that is provided so as to be able to contact the rail from the inside in the seat width direction, thereby restricting movement of the shaft outward in the seat width direction. Therefore, the restricting portion can restrict the movement of the shaft outward in the seat width direction, thereby preventing the outer contact member from becoming difficult to rotate due to the movement of the shaft outward in the seat width direction.

[0012] In other words, when the shaft moves outward in the seat width direction, the restricting portion, to which the force toward the outside in the seat width direction is transmitted from the shaft, comes into contact with the rail from the inside in the seat width direction, which applies a reaction force toward the inside in the seat width direction to the shaft, restricting the movement of the shaft outward in the seat width direction.

[0013] In the embodiment described below, all of the pair of first running portions and the pair of second running portions include the shaft, the outer contact member, the inner contact member, and the restricting portion described above. However, this aspect is not limited to this. In the embodiment described below, the inner contact member and the restricting portion are integrated together, but this embodiment is not limited to this, and the inner contact member and the restricting portion may be separate bodies. In the embodiment described below, the inner contact member has a substantially cylindrical outer shape. Therefore, the inner contact member is configured to roll relative to the rail when the traveling part moves in the front-rear direction along the rail. However, this aspect is not limited to this, and the inner contact member may be configured to slide relative to the rail when the traveling part moves in the front-rear direction along the rail. In the embodiment described below, the restricting portion is provided so as to be able to contact the end portion of the large-width plate portion of the rail on the inner side in the seat width direction. However, the restricting portion of this aspect is not limited to this, and may be provided so as to be able to contact another portion of the rail from the inner side in the seat width direction.

[0014] A seat suspension device according to a second aspect is the same as that of the first aspect, in which the inner contact member and the restricting portion are integrated together.

[0015] In this aspect, the inner contact member and the restricting portion are integrated together. This makes it easier to assemble the inner contact member to the shaft than in a configuration in which the inner contact member and the restricting portion are separate. Also, when the outer contact member and the inner contact member are adjacent to each other in the seat width direction, friction between the outer contact member and the inner contact member can be reduced.

[0016] The seat suspension device of the third aspect is the first or second aspect, wherein the inner contact member is configured to perform a rolling motion relative to the rail when the running portion moves in the front-to-rear direction along the rail.

[0017] In this aspect, the inner contact member is configured to roll relative to the rail when the running portion moves back and forth along the rail. This reduces friction between the inner contact member and the rail when the traveling portion travels.

[0018] The seat suspension device of the fourth aspect is any one of the first to third aspects, wherein the one vertical side in which the outer contact member contacts the rail is the vertical inner side of the seat suspension device.

[0019] In this aspect, the one side in the up-down direction, which is the direction in which the outer contact member comes into contact with the rail, is the inner side in the up-down direction of the seat suspension device. In other words, the outer contact member contacts the rail from the inside in the up-down direction of the seat suspension device. Therefore, when the upper frame receives a downward load and the suspension device is compressed in the vertical direction, the force from the rail is received by the outer contact member. As a result, a normal force between the rail and the outer contact member can be ensured, allowing the outer contact member to perform appropriate rolling motion relative to the rail. Furthermore, when the upper frame receives a downward load, the force from the rail of the upper frame is not received by the inner contact member, so even if the inner contact member does not perform rolling motion, friction between the inner contact member and the rail can be suppressed.

[0020] A fifth aspect of the seat suspension device is any of the first to fourth aspects, wherein at least one rail on which the at least one running portion runs comprises a small width plate portion arranged on the other vertical side of the outer contact member, a large width plate portion arranged on one vertical side of the inner contact member, and a vertical plate portion connecting the small width plate portion and the large width plate portion in the vertical direction, and the regulating portion is arranged so as to be able to contact the inner end of the large width plate portion in the seat width direction.

[0021] In this aspect, at least one rail on which at least one running portion runs comprises a small width plate portion arranged on the other vertical side of the outer contact member, a large width plate portion arranged on one vertical side of the inner contact member, and a vertical plate portion connecting the small width plate portion and the large width plate portion in the vertical direction. The restricting portion is provided so as to be able to come into contact with an inner end portion of the large width plate portion in the seat width direction. Therefore, it is possible to provide the restricting portion while providing the rail with a structure similar to that of the conventional structure. [Effects of the Invention]

[0022] As described above, the present invention provides a seat suspension device that can reduce frictional resistance occurring between members. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a perspective view showing a suspension device according to an embodiment. [Figure 2]1 is a side view showing a suspension device according to an embodiment. [Figure 3] 10 is a cross-sectional view showing a pair of running portions provided on a first link arm, a pair of running portions provided on a second link arm, and the rails corresponding to each running portion; FIG. [Figure 4] FIG. 4 is an enlarged cross-sectional view showing the running portion and the rail. [Figure 5] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0024] A seat suspension device 10 according to an embodiment of the present invention will now be described.

[0025] The arrows FR and UP shown in each figure indicate the forward and upward directions, respectively, of the seat suspension device 10. Hereinafter, when the terms "front-rear," "left-right (width direction)," and "up-down" are used simply, they will indicate directions relative to the seat. The suspension device 10 is mounted on a vehicle with its forward direction facing the front of the vehicle, its width direction facing the width direction of the vehicle, and its upward direction facing the top of the vehicle.

[0026] <Basic configuration> 1 and 2 show a suspension device 10 according to this embodiment.

[0027] 1 and 2, suspension device 10 includes a lower frame 12, an upper frame 14, and a link mechanism 16 that supports upper frame 14 so that it can move up and down relative to lower frame 12. Also, as shown in FIG. 1, suspension device 10 includes an air spring 18A and a hydraulic cylinder damper 18B as buffer means.

[0028] The lower frame 12 includes a pair of left and right front and rear members 12W extending in the front-rear direction, a front horizontal member 12F extending in the left-right direction and connecting the front ends of the front and rear members 12W, and a rear horizontal member 12R connecting the rear ends of the front and rear members 12W. The lower frame 12 is fixed to a vehicle floor (not shown) via brackets 13 or the like.

[0029] The upper frame 14 comprises a pair of left and right front and rear members 14W extending in the front-to-rear direction, a front horizontal member 14F extending in the left-to-right direction connecting the front ends of the front and rear members 14W, and a rear horizontal member 14R connecting the rear ends of the front and rear members 14W.

[0030] Each of the pair of front and rear members 12W of the lower frame 12 includes a rail 20. Each of the pair of front and rear members 14W of the upper frame 14 also includes a rail 20.

[0031] The link mechanism 16 includes a first link arm 30 that is inclined upward toward the front and a second link arm 40 that is inclined downward toward the front. The first link arm 30 and the second link arm 40 are configured to be rotatable relative to each other around an axis that extends in the seat width direction.

[0032] The first link arm 30 is rotatably supported by the front and rear members 12W of the lower frame 12 at its rear end portion, which serves as a fixed end portion. The second link arm 40 is rotatably supported at its rear end portion, which serves as a fixed end portion, by each of the front and rear members 14W of the upper frame 14.

[0033] The first link arm 30 has a pair of running portions 50 in the seat width direction at its front end portion as a movable end portion. The pair of running portions 50 of the first link arm 30 are configured to be able to run along the pair of rails 20 of the upper frame 14.

[0034] The second link arm 40 has a pair of running portions 50 in the seat width direction at its front end portion as a movable end portion. The pair of running portions 50 of the second link arm 40 are configured to be able to run along the pair of rails 20 of the lower frame 12.

[0035] The link mechanism 16 extends and retracts with the rear part on the lower frame 12 side as a fulcrum, and the upper frame 14 rises and falls in accordance with the extension and retraction. When the link mechanism 16 extends and the upper frame 14 rises, the pair of running portions 50 of each link arm 30, 40 runs along the pair of rails 20 toward the rear of the seat. When the link mechanism 16 contracts and the upper frame 14 descends, the pair of running portions 50 of each link arm 30, 40 runs along the pair of rails 20 toward the front side of the seat.

[0036] <Rail 20 and running portion 50> Next, the rail 20 and the running section 50 that can run along the rail 20 will be described.

[0037] 3, the pair of running portions 50 of the first link arm 30 and the pair of rails 20 corresponding thereto have a symmetrical structure in the seat width direction. The pair of running portions 50 of the second link arm 40 and the pair of rails 20 corresponding thereto also have a symmetrical structure in the seat width direction. Furthermore, the pair of running portions 50 of the first link arm 30 and the pair of rails 20 corresponding thereto, and the pair of running portions 50 of the second link arm 40 and the pair of rails 20 corresponding thereto have a symmetrical structure in the up-down direction.

[0038] The following will collectively describe the running portions 50 and rails 20 provided at four locations. In the following description, the terms "outside in the vertical direction" and "inside in the vertical direction" will be used. With respect to the pair of running portions 50 provided on the first link arm 30 and the pair of rails 20 corresponding thereto, the upper side of the seat in the vertical direction corresponds to the outer side in the vertical direction, and the lower side of the seat in the vertical direction corresponds to the inner side in the vertical direction. With respect to the pair of running portions 50 provided on the second link arm 40 and the pair of rails 20 corresponding thereto, the upper side of the seat in the vertical direction corresponds to the inner side in the vertical direction, and the lower side of the seat in the vertical direction corresponds to the outer side in the vertical direction.

[0039] The rails 20 have a U-shaped cross section that opens inward in the seat width direction. That is, each rail 20 has a pair of upper and lower horizontal plate portions 21, 22 that are parallel to each other, and a vertical plate portion 23 that connects the outer ends of these horizontal plate portions 21, 22 in the seat width direction.

[0040] The pair of upper and lower horizontal plate portions 21, 22 is composed of a horizontal plate portion 21 with a small width (hereinafter referred to as the small width plate portion 21) and a horizontal plate portion 22 with a large width (hereinafter referred to as the large width plate portion 22). Of the pair of upper and lower horizontal plate portions 21, 22, the horizontal plate portion 21 on the outer side in the vertical direction is the small width plate portion 21, and the horizontal plate portion 22 on the inner side in the vertical direction is the large width plate portion 22. The large width plate portion 22 protrudes inward in the seat width direction beyond the small width plate portion 21, and the protruding portion functions to abut against the slider 53.

[0041] The running portion 50 includes a shaft 51, a roller 52 attached to the shaft 51, and a slider 53 attached to the shaft 51. The roller 52 is disposed on the outer side in the sheet width direction relative to the slider 53. Hereinafter, the roller 52 may be referred to as the outer contact member 52.

[0042] 3, the running section 50 on one side in the seat width direction and the running section 50 on the other side in the seat width direction share a shaft 51. The shaft 51 is provided so as to pass through the inside of a tubular member 54 of the first link arm 30 or the second link arm 40. An insert member 55 is inserted into both sides of the tubular member 54 in the seat width direction. By inserting the insert member 55, the shaft 51 is fixed so as not to rotate relative to the tubular member 54.

[0043] The roller 52 is incorporated between the large plate portion 22 and the small plate portion 21 of the rail 20. The slider 53 is incorporated in a state in which it abuts against the inner surface of the large plate portion 22. In this incorporated state, the roller 52 abuts against the inner surface of the small plate portion 21, but does not abut against the large plate portion 22. The slider 53 also abuts against the inner surface of the large plate portion 22, but does not abut against the small plate portion 21.

[0044] The slider 53 and the roller 52 are both rotatably provided relative to the shaft 51. The slider 53 has an insertion hole 53K through which the shaft 51 passes. The roller 52 has an accommodation hole 52K that accommodates the end of the shaft 51. The accommodation hole 52K is open to the inside in the sheet width direction.

[0045] A plurality of grooves 53K1 extending in the axial direction are formed inside the insertion hole 53K of the slider 53. The grooves 53K1 are grooves for holding grease.

[0046] The slider 53 has a main body 53A and an expanded diameter portion 53B formed on the inner side in the sheet width direction relative to the main body 53A. The main body 53A of the slider 53 is disposed on the inner side in the sheet width direction relative to the roller 52. Hereinafter, the main body 53A of the slider 53 may be referred to as the inner contact member 53A.

[0047] The main body portion 53A and the expanded diameter portion 53B both have a substantially cylindrical outer shape. The expanded diameter portion 53B has a larger diameter than the main body portion 53A. The outer peripheral surface of the main body portion 53A functions as a rolling surface 53S that comes into contact with the rail 20. In the cross-sectional view shown in FIG. 4, the rolling surface 53S of the slider 53 extends linearly in parallel with the seat width direction.

[0048] The roller 52 has a substantially cylindrical outer shape. The outer peripheral surface of the substantially cylindrical roller 52 functions as a rolling surface 52S that comes into contact with the rail 20. In the cross-sectional view shown in Fig. 4, the rolling surface 52S of the roller 52 extends in a curved shape. This reduces the contact area between the rolling surface 52S of the roller 52 and the rail 20.

[0049] The expanded diameter portion 53B of the slider 53 is disposed on the inner side in the seat width direction relative to the inner end portion 22E of the large width plate portion 22. This allows the expanded diameter portion 53B to come into contact with the inner end portion 22E of the large width plate portion 22 from the inner side in the seat width direction.

[0050] The slider 53 is provided with the expanded diameter portion 53B, which restricts the movement of the slider 53 outward in the seat width direction. As a result, the movement of the insertion member 55, which contacts the slider 53 from the inside in the seat width direction, outward in the seat width direction is restricted, and further, the movement of the shaft 51 outward in the seat width direction is also restricted.

[0051] An outer protrusion 53B1 is formed in the expanded diameter portion 53B at a position where it comes into contact with the rail 20. The outer protrusion 53B1 is a protrusion that protrudes outward in the seat width direction from the outer surface of the expanded diameter portion 53B in the seat width direction. The outer protrusion 53B1 extends in an annular shape.

[0052] The slider 53 has an inner convex portion 53B2. The inner convex portion 53B2 is a convex portion that protrudes inward in the seat width direction from the inner surface of the slider 53 in the seat width direction. The inner convex portion 53B2 extends in an annular shape.

[0053] The material of the slider 53 and the roller 52 is not particularly limited, but may be made of, for example, a resin that has excellent sliding and gliding properties.

[0054] When the link mechanism 16 expands and contracts to raise and lower the upper frame 14, the roller 52 rolls on the inner surface of the small plate portion 21 while rotating relative to the shaft 51, and the slider 53 rolls on the inner surface of the large plate portion 22. The rotation directions of the roller 52 and the slider 53 are opposite to each other. As a result, the pair of running portions 50 of each link arm 30, 40 runs along the rail 20 in the front-rear direction.

[0055] <Action and effect> Next, the effects of this embodiment will be described.

[0056] In this embodiment, the seat suspension device 10 includes a lower frame 12, an upper frame 14, and a link mechanism 16. The link mechanism 16 supports the upper frame 14 relative to the lower frame 12 so that the upper frame 14 is movable in the up and down direction.

[0057] In this embodiment, the lower frame 12 and the upper frame 14 each have a pair of rails 20. The link mechanism 16 has a first link arm 30 configured to be rotatable about an axis in the seat width direction relative to the lower frame 12, and a second link arm 40 configured to be rotatable about an axis in the seat width direction relative to the upper frame 14. The first link arm 30 has a pair of first running portions 50 that can run along the pair of rails 20 of the upper frame 14, and the second link arm 40 has a pair of second running portions 50 that can run along the pair of rails 20 of the lower frame 12. Therefore, when the upper frame 14 moves up and down relative to the lower frame 12, the first link arm 30 rotates about an axis in the seat width direction relative to the lower frame 12, and the second link arm 40 rotates about an axis in the seat width direction relative to the upper frame 14. The pair of first running portions 50 of the first link arm 30 run along the pair of rails 20 of the upper frame 14, and the pair of second running portions 50 of the second link arm 40 run along the pair of rails 20 of the lower frame 12.

[0058] In this embodiment, at least one of the pair of first running portions 50 and the pair of second running portions 50 includes a shaft 51, an outer contact member 52, and an inner contact member 53A. The outer contact member 52 and the inner contact member 53A are both attached to the shaft 51. The outer contact member 52 contacts the rail 20 from one side in the up-down direction, and the inner contact member 53A contacts the rail 20 from the other side in the up-down direction. Therefore, rattling of the running part 50 relative to the rail 20 in the vertical direction can be suppressed.

[0059] In this embodiment, the outer contact member 52 is rotatable relative to the shaft 51. As a result, the outer contact member 52 is configured to perform a rolling motion relative to the rail 20 when the traveling part 50 moves in the forward and backward directions along the rail 20. Therefore, friction between the outer contact member 52 and the rail 20 when the traveling part 50 travels is suppressed.

[0060] Incidentally, when the shaft 51 moves outward in the seat width direction, it is possible that the outer contact member 52 becomes difficult to rotate. Specifically, for example, the outer contact member 52 may become pinched in the seat width direction between the shaft 51 and the rail 20, making it difficult for the outer contact member 52 to rotate. Even if the outer contact member 52 is not pinched between the shaft 51 and the rail 20, a force may be transmitted from the shaft 51 to the inner contact member 53A outward in the seat width direction, making it possible that the outer contact member 52 may become pinched in the seat width direction between the inner contact member 53A and the rail 20, making it difficult for the outer contact member 52 to rotate. When it becomes difficult for the outer contact member 52 to rotate, the resistance friction generated between the outer contact member 52 and the rail 20 increases. Therefore, in this embodiment, the at least one running portion 50 includes a restricting portion 53B. The restricting portion 53B is provided so as to be able to come into contact with the rail 20 from the inside in the seat width direction. As a result, the restricting portion 53B is configured to restrict the movement of the shaft 51 outward in the seat width direction. Therefore, the restricting portion 53B can restrict the movement of the shaft 51 outward in the seat width direction. As a result, it is possible to prevent the outer contact member 52 from becoming difficult to rotate due to the movement of the shaft 51 outward in the seat width direction.

[0061] In other words, when the shaft 51 moves outward in the seat width direction, the restricting portion 53B, to which the force toward the outside in the seat width direction is transmitted from the shaft 51, comes into contact with the rail 20 from the inside in the seat width direction. As a result, a reaction force toward the inside in the seat width direction acts on the shaft 51, restricting the movement of the shaft 51 outward in the seat width direction.

[0062] In this embodiment, the inner contact member 53A and the restricting portion 53B are integrated together. Therefore, compared to a configuration in which the inner contact member 53A and the restricting portion 53B are separate bodies, assembly to the shaft 51 is easier. Furthermore, when the outer contact member 52 and the inner contact member 53A are adjacent to each other in the seat width direction, rubbing between the outer contact member 52 and the inner contact member 53A can be suppressed.

[0063] In this embodiment, the inner contact member 53A is configured to perform a rolling motion relative to the rail 20 when the traveling part 50 moves in the front-rear direction along the rail 20. Therefore, friction between the inner contact member 53A and the rail 20 when the traveling part 50 travels is suppressed.

[0064] In this embodiment, one side in the up-down direction, which is the direction in which the outer contact member 52 comes into contact with the rail 20, is the inner side in the up-down direction of the seat suspension device 10. In other words, the outer contact member 52 contacts the rail 20 from the inside in the up-down direction of the seat suspension device 10. Therefore, when the upper frame 14 receives a downward load and the suspension device 10 is compressed in the up-down direction, the force from the rail 20 is received by the outer contact member 52. As a result, a normal force between the rail 20 and the outer contact member 52 can be ensured, allowing the outer contact member 52 to perform appropriate rolling motion relative to the rail 20. Furthermore, when the upper frame 14 receives a downward load, the force from the rail 20 is not received by the inner contact member 53A, so even if the inner contact member 53A does not perform rolling motion, friction between the inner contact member 53A and the rail 20 can be suppressed.

[0065] In addition, in this embodiment, at least one rail 20 on which at least one running section 50 runs comprises a small width plate section 21 arranged on the other side of the outer contact member 52 in the vertical direction, a large width plate section 22 arranged on one side of the inner contact member 53A in the vertical direction, and a vertical plate section 23 connecting the small width plate section 21 and the large width plate section 22 in the vertical direction. The restricting portion 53B is provided so as to be able to come into contact with an end portion 22E of the large-width plate portion 22 on the inner side in the seat width direction. Therefore, the restricting portion 53B can be provided while the rail 20 has the same structure as the conventional structure.

[0066] The above describes one embodiment of the present invention, but the present invention is not limited to the above, and it goes without saying that it can be implemented in various other modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0067] 10 Seat suspension device 12 Lower frame 14 Upper frame 16 Link mechanism 20 Rail 21 Width small plate part (horizontal plate part) 22 Large width plate part (horizontal plate part) 22E End 23 Vertical plate section 30 First link arm 40 Second link arm 50 First running section (running section) 50 Second running section (running section) 51 Shaft 52 Roller (outer contact member) 53 Slider 53A Main body (inner contact member) 53B Expanded diameter part (regulating part)

Claims

1. a lower frame having a pair of rails; an upper frame having a pair of rails; a link mechanism that supports the upper frame so as to be vertically movable relative to the lower frame; Equipped with The link mechanism includes: a first link arm configured to be rotatable around an axis in the seat width direction relative to the lower frame; a second link arm configured to be rotatable around an axis in the seat width direction relative to the upper frame; and the first link arm has a pair of first running portions that can run along a pair of rails of the upper frame, the second link arm has a pair of second running portions that can run along a pair of rails of the lower frame, At least one of the pair of first running portions and the pair of second running portions is A shaft and an outer contact member rotatably attached to the shaft and in contact with the rail from one side in the up-down direction, the outer contact member configured to perform a rolling motion relative to the rail when the traveling part moves in the front-rear direction along the rail; an inner contact member attached to the shaft at a position more inward in the seat width direction than the outer contact member and contacting the rail from the other side in the up-down direction; a restricting portion configured to be able to contact the rail from the inside in the seat width direction, thereby restricting movement of the shaft outward in the seat width direction; Equipped with Seat suspension device.

2. The inner contact member and the restricting portion are integrated.

2. The seat suspension device according to claim 1.

3. The inner contact member is configured to perform a rolling motion relative to the rail when the running portion moves in the forward and backward directions along the rail.

2. The seat suspension device according to claim 1.

4. the one side in the up-down direction, which is a direction in which the outer contact member contacts the rail, is the inner side in the up-down direction of the seat suspension device; 2. The seat suspension device according to claim 1.

5. At least one rail on which the at least one running portion runs is a narrow plate portion disposed on the other side of the outer contact member in the up-down direction; a large width plate portion disposed on one side of the inner contact member in the up-down direction; a vertical plate portion that connects the small width plate portion and the large width plate portion in the up-down direction; Equipped with The regulating portion is provided so as to be able to come into contact with an inner end portion of the large width plate portion in the seat width direction.

2. The seat suspension device according to claim 1.

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