JP2023174121A - Seat support device and vehicle seat - Google Patents

Abstract

To ensure vibration absorption performance in the state that a seating face is located at an upper limit position and a lower limit position.SOLUTION: A seat support device comprises: a valve 46 which can supply air to an air spring by pressing of a feed valve bar 46D, and can discharge air from the air spring by pressing of an exhaust valve bar 46E; a single lever 54; and a height linkage part 44. The height linkage part 44 comes into contact with a second arm part 54E of the lever 54 in the state that a position of an upper frame with respect to a lower frame reaches an upper limit position, thereby restricting rotation of the lever 54 to one side by operation of a first operation cable 50. Further, the height linkage part 44 comes into contact with a first arm part 54B of the lever 54 in the state that a position of the upper frame with respect to the lower frame reaches a lower limit position, thereby restricting rotation of the lever 54 to the other side by operation of a second operation cable 52.SELECTED DRAWING: Figure 3

Description

The present invention relates to a seat support device and a vehicle seat.

Patent Document 1 listed below discloses a seat support device (vehicle air suspension type seat support device) that supports a vehicle seat so that it can move up and down. The seat support device described in this document is equipped with a valve that allows air to be taken in and out of an air spring that can adjust the height of the seating surface of the seat. and a second camshaft.

Further, a first cam including a pair of wing portions and a cam portion is rotatably supported on the first camshaft. On the other hand, a second cam including a pair of pushing portions and a recessed portion is rotatably supported on the second camshaft. Further, the cam part of the first cam is inserted into the recessed part of the second cam, and when the first cam rotates, the second cam also rotates, and the pushing part pushes the air supply valve rod of the valve. Or the exhaust valve stem is pushed. When the intake valve stem is pushed by the second cam, air is supplied to the air spring and the seating surface of the seat rises, and when the exhaust valve stem is pushed by the second cam, the air in the air spring is exhausted. The seat surface is designed to lower.

JP2011-213287A

By the way, in the prior art described in Patent Document 1, the valve is biased by a compression coil spring. In addition, a cable is attached to this valve, and when this cable is pulled, the valve is moved in the direction of compressing the compression coil spring, and when the force pulling this cable is released, the compression coil spring is expanded. , the valve is designed to move.

On the other hand, in a state where the cable is not being operated, a position transmission pin disposed at a predetermined position is locked in a recess provided at the boundary between the pair of wing parts of the first cam. Then, by operating the cable, the valve moves relative to the position transmission pin, and as a result, the wing portion of the first cam is pushed by the position transmission pin, causing the first cam to rotate. This in turn causes the second cam to rotate.

However, in the prior art described in Patent Document 1, even when the seating surface of the seat is raised to the upper limit position, the first cam and the second cam are rotated by operating the cable, and the air spring is air can be supplied to. For this reason, when the seating surface of the seat is raised to the upper limit position, the pressure within the air spring becomes excessively high, and it is conceivable that the air spring may not be able to sufficiently exhibit its vibration absorption performance.

Furthermore, in the prior art described in Patent Document 1, even when the seating surface of the seat is lowered to the lower limit position, the first cam and the second cam are rotated by operating the cable, and the air spring is released. air can be expelled from the For this reason, when the seating surface of the seat is lowered to the lower limit position, the pressure within the air spring becomes excessively low, and it is conceivable that the air spring cannot sufficiently exhibit its vibration absorption performance.

That is, in the prior art described in Patent Document 1, there is room for improvement in terms of ensuring vibration absorption performance when the seating surface of the seat is at the upper limit position or the lower limit position.

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a seat support device and a vehicle seat that can ensure vibration absorption performance when the seat surface is at the upper limit position or the lower limit position.

The seat support device of the first aspect includes an upper frame that supports a seat body on which an occupant is seated from below the seat, a lower frame that is arranged below the seat of the upper frame and fixed to the vehicle body, and the upper frame. is provided between a connecting portion that connects the upper frame and the lower frame in a state that is movable relative to the lower frame in the seat up-down direction, and the upper frame and the lower frame, and is supplied inside. an air spring whose dimension in the vertical direction of the seat changes according to the amount of air in the seat to change the distance between the upper frame and the lower frame in the vertical direction of the seat; an air supply valve stem; and an exhaust valve stem. a valve configured to be capable of supplying air to the air spring by pressing the air supply valve stem, and capable of discharging air from the air spring by pressing the exhaust valve stem; a rotation support part rotatably supported around an axis; a first arm part extending from the rotation support part and to which a first operation cable is connected; a second arm part extending in a different direction from the first arm part and to which a second operating cable is connected; A single lever in which the first arm presses the intake valve stem, and when the second operation cable is operated, rotates to the other side, and the second arm presses the exhaust valve stem. , is displaced to a position corresponding to the distance between the upper frame and the lower frame in the seat vertical direction, and comes into contact with the second arm portion with the position of the upper frame relative to the lower frame reaching an upper limit position. As a result, rotation of the lever to one side due to the operation of the first operation cable is restricted, and the upper frame comes into contact with the first arm portion when the position relative to the lower frame reaches the lower limit position. This includes a height interlocking portion that limits rotation of the lever to the other side due to operation of the second operation cable.

According to the seat support device of the first aspect, the seat body on which the occupant sits is supported by the upper frame. On the other hand, a lower frame is arranged below the seat of the upper frame, and the lower frame is fixed to the vehicle body. The upper frame and the lower frame are connected by a connecting portion such that the upper frame is movable relative to the lower frame in the seat up-down direction.

Furthermore, an air spring is provided between the upper frame and the lower frame. The air spring changes its dimensions in the vertical direction of the seat depending on the amount of air supplied therein, thereby changing the distance between the upper frame and the lower frame in the vertical direction of the seat. Thereby, the height of the upper frame relative to the lower frame is adjusted. As a result, the height of the seat body is adjusted.

On the other hand, the supply of air to the air spring and the discharge of air from the air spring are performed by valves. This valve includes an air supply valve stem and an exhaust valve stem. When the air supply valve stem is pressed, air is supplied to the air spring, and when the exhaust valve stem is pressed, air is supplied to the air spring. Air is expelled from the air spring.

Here, when the first operation cable is operated, the lever rotates to one side, and the first arm of the lever presses the air supply valve rod. This supplies air to the air spring. Further, when the second operating cable is operated, the lever rotates to the other side, and the second arm portion of the lever presses the exhaust valve stem. This causes air to be expelled from the air spring.

By the way, if air continues to be supplied to the air spring, the upper frame will rise to the upper limit position relative to the lower frame. At this time, if the first operation cable is operated and the lever presses the air supply valve rod to supply air to the air spring, the pressure within the air spring may become excessively high. Furthermore, if air continues to be discharged from the air spring, the upper frame will descend to the lower limit position relative to the lower frame. At this time, if the second arm is pressed against the exhaust valve rod by operating the second operating cable and air is discharged from the air spring, the pressure within the air spring may become excessively low. In these cases, it is conceivable that the air spring may not be able to sufficiently exhibit its vibration absorption performance.

Here, in the present invention, the height interlocking section is provided, and the height interlocking section is displaced to a position corresponding to the distance between the upper frame and the lower frame in the seat vertical direction. When the position of the upper frame relative to the lower frame reaches the upper limit position, the height interlocking part contacts the second arm part, and the rotation of the lever to one side by operating the first operating cable is restricted. be done. This prevents air from being supplied to the air spring, and prevents the pressure within the air spring from becoming excessively high. On the other hand, when the position of the upper frame relative to the lower frame has reached the lower limit position, the height interlocking part contacts the first arm part, and the lever is rotated to the other side by operating the second operating cable. is limited. This prevents the air within the air spring from being discharged, and prevents the pressure within the air spring from becoming excessively low. Thus, in the present invention, when the position of the upper frame relative to the lower frame has reached the upper limit position or the lower limit position, that is, when the position of the seat surface of the seat body has reached the upper limit position or the lower limit position, The vibration absorption performance of the air spring can be ensured.

In the seat support device according to a second aspect, in the seat support device according to the first aspect, the height interlocking portion includes a rotation contact portion that is disposed adjacent to the lever and is rotatably supported. The rotating contact portion includes a first contact portion and a second contact portion spaced apart from each other in the rotational circumferential direction, and the position of the upper frame relative to the lower frame is an upper limit position. In the state in which the first contact portion is separated from the first arm portion, the second contact portion is in contact with the second arm portion, and the upper frame is in contact with the lower frame. When the position has reached the lower limit position, the first contact portion is in contact with the first arm portion, and the second contact portion is spaced apart from the second arm portion.

According to the seat support device of the second aspect, the rotating contact portion rotates to a position corresponding to the distance between the upper frame and the lower frame in the seat vertical direction. When the position of the upper frame relative to the lower frame reaches the upper limit position, the first contact part of the rotary contact part is separated from the first arm part, and the second contact part of the rotary contact part is separated from the first arm part. It is in contact with the second arm part. This restricts the rotation of the lever to one side due to the operation of the first operation cable. Further, when the position of the upper frame relative to the lower frame has reached the lower limit position, the first contact part of the rotary contact part is in contact with the first arm part, and the second contact part of the rotary contact part is in contact with the first arm part. It is spaced apart from the second arm section. This restricts the rotation of the lever to the other side due to the operation of the second operation cable. As described above, in the present invention, the rotation of the lever can be restricted by rotating the rotating contact portion to a position corresponding to the distance between the upper frame and the lower frame in the seat vertical direction.

A vehicle seat according to a third aspect includes a seat body on which an occupant sits, an upper frame that supports the seat body from a lower side of the seat, and a lower frame that is arranged on a lower side of the seat of the upper frame and is fixed to the vehicle body. a connecting portion connecting the upper frame and the lower frame in a state where the upper frame is movable relative to the lower frame in the seat up-down direction; and a connecting portion provided between the upper frame and the lower frame. , an air spring whose dimension in the vertical direction of the seat changes according to the amount of air supplied to the interior, and which changes the distance between the upper frame and the lower frame in the vertical direction of the seat; an air intake valve rod; and an exhaust valve rod. and a valve stem, and when the air supply valve stem is pressed, air can be supplied to the air spring, and when the exhaust valve stem is pressed, air can be discharged from the air spring. a rotary support part rotatably supported around a predetermined axis; a first arm part extending from the rotary support part and to which a first operating cable is connected; a second arm part extending from the dynamic support part in a direction different from the first arm part and to which a second operating cable is connected; When the first arm rotates, the first arm presses the intake valve stem, and when the second operation cable is operated, the second arm rotates to the other side and presses the exhaust valve stem. The second lever is displaced to a position corresponding to the distance between the upper frame and the lower frame in the seat vertical direction, and the position of the upper frame with respect to the lower frame has reached the upper limit position. By contacting the arm portion, rotation of the lever to one side due to the operation of the first operation cable is restricted, and when the position of the upper frame with respect to the lower frame has reached the lower limit position, the first A height interlocking part that comes into contact with the arm part restricts rotation of the lever to the other side due to operation of the second operation cable.

The vehicle seat of the third aspect has the configuration of the seat support device of the first aspect. Thereby, the vibration absorption performance of the air spring can be ensured in a state where the position of the seat surface of the seat body reaches the upper limit position or the lower limit position.

The seat support device and the vehicle seat according to the present invention have an excellent effect in that vibration absorption performance can be ensured in a state where the seat surface is at the upper limit position or the lower limit position.

FIG. 1 is a perspective view showing a vehicle seat according to the present embodiment. FIG. 1 is a side view showing the vehicle seat of the present embodiment. FIG. 3 is a side view schematically showing a height control unit. FIG. 3 is a side view schematically showing the height control unit, showing a state in which the first operation cable is pulled. FIG. 3 is a side view schematically showing the height control unit, showing a state in which the second operation cable is pulled. FIG. 3 is a side view schematically showing the height control unit, showing a state in which the first contact portion of the rotating contact portion is in contact with the first arm portion. FIG. 3 is a side view schematically showing the height control unit, showing a state in which the second contact portion of the rotating contact portion is in contact with the second arm portion.

A vehicle seat 10 according to an embodiment of the present invention will be described using FIGS. 1 to 3. Note that arrow FR, arrow UP, arrow RH, and arrow LH shown in the figure respectively indicate the front side, the upper side, the right side, and the left side of the seat as viewed from the occupant seated on the vehicle seat 10. Hereinafter, when a description is made simply using front and rear, up and down, and left and right directions, unless otherwise specified, the front and back of the seat front and back direction, the top and bottom of the seat up and down direction, and the left and right of the seat left and right directions are meant, unless otherwise specified. Further, the sheet left-right direction coincides with the sheet width direction.

As shown in FIG. 1, the vehicle seat 10 according to the present embodiment includes a seat body 12 on which a vehicle occupant sits, and a seat support device 14 that supports the seat body 12 so as to be vertically movable. There is.

The seat body 12 includes a seat cushion 16 having a "seat surface 16A" on which an occupant sits, a seat back 18 that supports the back of the occupant, and a headrest 20 that supports the occupant's head. The seat body 12 is supported from below by a seat support device 14.

As shown in FIG. 2, the seat support device 14 includes an upper frame 22, a lower frame 24, a link mechanism 26 as a connecting portion, an air spring 28, and a damper 30.

The seat body 12 is fixed to the upper frame 22. The upper frame 22 includes a pair of left and right rail members 22A arranged at intervals in the left and right direction, and a pair of front and rear lateral members (not shown) that connect the front and rear ends of the pair of left and right rail members 22A in the left and right direction, respectively. It is composed of and. As a result, the upper frame 22 has a rectangular frame shape when viewed from above.

Further, the center portions of the pair of left and right rail members 22A in the front and rear direction are connected to each other via a plate-shaped upper support plate portion 32 whose vertical direction is the thickness direction. An air spring 28 is attached to this upper support plate portion 32, as will be described later.

The lower frame 24 is disposed below the upper frame 22 and is fixed to the floor of the vehicle body (not shown). The lower frame 24 includes a pair of left and right rail members 24A arranged at intervals in the left and right direction, and a pair of front and rear lateral members (not shown) that connect the front and rear ends of the pair of left and right rail members 24A in the left and right direction, respectively. It is composed of and. As a result, the lower frame 24 has a rectangular frame shape when viewed from above.

Further, the central portions of the pair of rail members 24A in the front-rear direction are connected to each other via a plate-shaped lower support plate portion 34 whose vertical direction is in the thickness direction, and this lower support plate portion 34 includes: As will be described later, an air spring 28 is attached.

The link mechanism 26 includes a pair of left and right X links 36. The upper end portions of the pair of left and right X links 36 are engaged with the upper frame 22, and the lower end portions of the pair of left and right X links 36 are engaged with the lower frame 24. The X link 36 also includes a first link part 38 that slopes downward as it goes from the front side to the rear side, and a second link part 40 that slopes upward as it goes from the front side to the rear side. , is equipped with. The first link part 38 and the second link part 40 are rotatably connected at the center in the front-rear direction with the left-right direction as an axial direction. The first link part 38 rotates relative to the second link part 40, thereby allowing the upper frame 22 to move up and down with respect to the lower frame 24. That is, the pair of left and right X links 36 of the link mechanism 26 connect the upper frame 22 and the lower frame 24 in a state where the upper frame 22 can move up and down with respect to the lower frame 24.

The air spring 28 has a substantially cylindrical outer shape with its axial direction in the vertical direction, and has an upper end fixed to the upper support plate 32 of the upper frame 22, and a lower end fixed to the upper support plate 32 of the upper frame 22. is fixed to the lower support plate portion 34 of the lower frame 24. Compressed air is supplied to the air spring 28 from, for example, an air compressor (air supply source) that constitutes a part of the air brake device of the vehicle. The air spring 28 supports the seat body 12 from below by supporting the upper frame 22 from below, and is capable of absorbing the load caused by vertical movement of the seat body 12.

Further, the air spring 28 is configured to expand in the vertical direction when air is supplied, and contract in the vertical direction when the air is discharged. Accordingly, in this embodiment, the upper frame 22 moves upward as the air spring 28 expands, and the upper frame 22 moves downward as the air spring 28 contracts. That is, the air spring 28 can adjust the height of the seat surface 16A of the seat body 12 supported by the upper frame 22 by expanding and contracting in the vertical direction according to the amount of air supplied.

The damper 30 is an oil type cylinder damper, and connects the upper frame 22 and the lower frame 24. The vibrations generated in the seat body 12 can be damped by the damper 30.

In this embodiment, the height of the seat surface 16A of the seat body 12 can be adjusted by adjusting the amount of air in the air spring 28 using the height control unit 42 shown in FIG. Moreover, the behavior of the height control unit 42 can be changed according to the height of the upper frame 22 (the height of the seat surface 16A of the seat body 12) by the height interlocking part 44 shown in FIG. Hereinafter, the configurations of the height control unit 42 and the height interlocking section 44, which constitute the main parts of this embodiment, will be explained in detail. In the following, unless otherwise specified, the explanation will proceed on the assumption that the height of the upper frame 22 relative to the lower frame 24 is at an intermediate position that is between the upper limit position and the lower limit position in the vertical direction. That's it.

As shown in FIG. 3, the height control unit 42 includes a valve 46, a housing 48, a first operating cable 50, a second operating cable 52, and a lever 54.

The valve 46 includes a casing 46A, a first port 46B, a second port 46C, an intake valve rod 46D, and an exhaust valve rod 46E. The casing 46A is made of metal, for example, and has a flow path portion formed inside thereof through which air flows. The casing 46A is provided with an air exhaust hole 46F that can communicate with the flow path inside the casing 46A.

A first port 46B and a second port 46C are provided on the opposite side of the casing 46A from a lever 54, which will be described later. Furthermore, an air supply valve rod 46D and an exhaust valve rod 46E are provided on the side of the lever 54 described later in the casing 46A.

The first port 46B is connected to the aforementioned air supply source via the hose 56. On the other hand, the second port 46C is connected to the air spring 28 (see FIG. 2) via a hose 58.

The air supply valve rod 46D can be moved in and out of the casing 46A on an extension of the first port 46B. Furthermore, a biasing member (not shown) is disposed inside the casing 46A, and the biasing member biases the air supply valve rod 46D toward the outside of the casing 46A.

Then, when the air supply valve rod 46D is pressed toward the casing 46A side, an air supply valve (not shown) disposed inside the casing 46A is opened, and the valve 46 connects the first port 46B and the second port through the flow path. It is configured to communicate with port 46C. That is, in this embodiment, when the air supply valve rod 46D is pressed, compressed air from the air supply source is supplied to the air spring 28 via the valve 46.

On the other hand, the exhaust valve rod 46E can be moved in and out of the casing 46A on the extension of the second port 46C. Further, a biasing member (not shown) is arranged inside the casing 46A, and the exhaust valve rod 46E is biased toward the outside of the casing 46A by the biasing member.

Then, when the exhaust valve rod 46E is pressed toward the casing 46A, an exhaust valve (not shown) disposed inside the casing 46A is opened, and the valve 46 is connected to the second port 46C and the air exhaust hole 46F via the flow path. It is now possible to communicate with each other. That is, in this embodiment, when the exhaust valve rod 46E is pressed, the air within the air spring 28 is exhausted from the air exhaust hole 46F of the valve 46.

The housing 48 includes a base portion 48A and a cover portion (not shown) that covers the base portion 48A. The base portion 48A includes a base plate portion 48B formed in a plate shape. A valve 46 is fixed to the base plate portion 48B, and a lever 54, which will be described later, and the like are supported.

The first operation cable 50 includes an outer tube (not shown) and a first control cable 50A inserted through the outer tube. The first control cable 50A is routed along the first port 46B and the air supply valve rod 46D side of the casing 46A.

The second operation cable 52 includes an outer tube (not shown) and a second control cable 52A inserted through the outer tube. The second control cable 52A is routed along the second port 46C and exhaust valve rod 46E side of the casing 46A.

The lever 54 is arranged to face the intake valve rod 46D and the exhaust valve rod 46E of the valve 46, and is rotatably supported by the base plate portion 48B of the housing 48. Specifically, the lever 54 includes a cylindrical rotation support portion 54A that is rotatably supported on the base plate portion 48B with the thickness direction of the base plate portion 48B as an axial direction.

Further, the lever 54 includes a first arm portion 54B extending from the outer peripheral portion of the rotation support portion 54A toward the air supply valve rod 46D side. The portion of the first arm portion 54B on the rotation support portion 54A side is arranged close to the tip of the air supply valve rod 46D when the first control cable 50A and the second control cable 52A are not operated. This serves as an air supply valve rod pressing portion 54C. Further, the end of the first arm portion 54B opposite to the rotation support portion 54A is a cable locking portion 54D to which the first control cable 50A is locked.

Further, the lever 54 includes a second arm portion 54E extending from the outer peripheral portion of the rotation support portion 54A toward the side opposite to the first arm portion 54B and toward the exhaust valve rod 46E. A portion of the second arm portion 54E on the rotation support portion 54A side is an exhaust gas disposed close to the tip of the exhaust valve rod 46E when the first control cable 50A and the second control cable 52A are not operated. This serves as a valve stem pressing portion 54F. Further, the end of the second arm portion 54E opposite to the rotation support portion 54A is a cable locking portion 54G to which the second control cable 52A is locked.

The height interlocking part 44 is arranged on the opposite side of the valve 46 with respect to the lever 54, and is rotatably supported by the base plate part 48B of the housing 48. To explain in detail, the height interlocking part 44 includes a rotary contact part 44A that is rotatably supported on the base plate part 48B with the thickness direction of the base plate part 48B as an axial direction. This rotating contact portion 44A is arranged adjacent to the lever 54. Further, a first contact portion 44B having a pointed tip is formed on the first arm portion 54B side of the lever 54 on the outer peripheral portion of the rotary contact portion 44A. Further, a second contact portion 44C having a sharp tip is formed on the outer peripheral portion of the rotary contact portion 44A on the second arm portion 54E side of the lever 54.

Further, the height interlocking section 44 includes an interlocking arm section 44D extending from the rotational contact section 44A toward the opposite side of the lever 54. The end of the interlocking arm 44D on the opposite side from the rotary contact portion 44A is connected to a portion of the link mechanism 26 (see FIG. 2) described above. As shown in FIGS. 2 and 3, when the link mechanism 26 is actuated by the upper frame 22 moving up and down with respect to the lower frame 24, the height interlocking section 44 rotates. 44 is arranged at a position corresponding to the distance between the upper frame 22 and the lower frame 24 in the seat vertical direction. Here, in this embodiment, when the upper frame 22 rises with respect to the lower frame 24, the height interlocking part 44 rotates in the direction of arrow A1. On the other hand, when the upper frame 22 descends relative to the lower frame 24, the height interlocking portion 44 rotates in the opposite direction to the arrow A1.

(Actions and effects of this embodiment)
Next, the operation and effects of this embodiment will be explained.

As shown in FIGS. 1, 2, and 3, in the vehicle seat 10 of this embodiment, an occupant seated on the seat body 12 operates the first operating cable 50 and the second operating cable 52 to The height of the seat surface 16A of the main body 12 can be adjusted.

As shown in FIGS. 2 and 4, when an occupant seated on the seat body 12 pulls the first control cable 50A of the first operation cable 50, the lever 54 rotates to one side (in the direction of arrow A2). , the air supply valve rod pressing portion 54C of the lever 54 presses the air supply valve rod 46D. As a result, compressed air from the air supply source is supplied to the air spring 28 via the valve 46, and the upper frame 22 is raised relative to the lower frame 24. As a result, the height of the seat surface 16A of the seat body 12 can be increased.

On the other hand, as shown in FIGS. 2 and 5, when the occupant seated on the seat body 12 pulls the second control cable 52A of the second operation cable 52, the lever 54 moves to the other side (in the opposite direction side), and the exhaust valve stem pressing portion 54F of the lever 54 presses the exhaust valve stem 46E. As a result, the air in the air spring 28 is discharged from the air exhaust hole 46F of the valve 46, and the upper frame 22 is lowered relative to the lower frame 24. As a result, the height of the seat surface 16A of the seat body 12 can be lowered.

Here, as shown in FIGS. 2 and 6, in a state in which the position of the upper frame 22 relative to the lower frame 24 has reached the upper limit position, that is, in a state in which the seat surface 16A of the seat body 12 has reached the upper limit position. In this case, the height interlocking part 44 is also arranged at a corresponding position. In this state, the first contact part 44B of the rotational contact part 44A of the height interlocking part 44 is separated from the first arm part 54B, and the second contact part 44C of the rotational contact part 44A is separated from the second arm part 54B. It is in contact with 54E. In a state where the second contact portion 44C of the rotation contact portion 44A is in contact with the second arm portion 54E, even if the first control cable 50A of the first operation cable 50 is pulled, the lever 54 is moved to one side (arrow A2 direction) cannot be rotated. As a result, when the seat surface 16A of the seat body 12 reaches the upper limit position, air is prevented from being supplied to the air spring 28, and the pressure within the air spring 28 is prevented from becoming excessively high. I can do it. Note that even if the second contact portion 44C of the rotation contact portion 44A is in contact with the second arm portion 54E, by pulling the second control cable 52A of the second operation cable 52, the lever 54 is moved to the other side (arrow A2 can be rotated in the opposite direction).

Further, as shown in FIGS. 2 and 7, when the position of the upper frame 22 relative to the lower frame 24 has reached the lower limit position, that is, when the seat surface 16A of the seat body 12 has reached the lower limit position, , the height interlocking part 44 is also arranged at a corresponding position. In this state, the second contact portion 44C of the rotation contact portion 44A of the height interlocking portion 44 is separated from the second arm portion 54E, and the first contact portion 44B of the rotation contact portion 44A is separated from the first arm portion 54E. It is in contact with 54B. When the first contact portion 44B of the rotation contact portion 44A is in contact with the first arm portion 54B, even if the second control cable 52A of the second operation cable 52 is pulled, the lever 54 is moved to the other side (arrow A2 cannot be rotated in the opposite direction). As a result, when the seat surface 16A of the seat body 12 reaches the lower limit position, the air in the air spring 28 is prevented from being discharged, and the pressure in the air spring 28 is prevented from becoming excessively low. be able to. Note that even if the first contact portion 44B of the rotating contact portion 44A is in contact with the first arm portion 54B, by pulling the first control cable 50A of the first operation cable 50, the lever 54 can be moved to one side (arrow A2 direction).

As explained above, in this embodiment, when the position of the upper frame 22 relative to the lower frame 24 has reached the upper limit position or the lower limit position, that is, the position of the seat surface 16A of the seat body 12 is at the upper limit position or the lower limit position. In this state, the air pressure within the air spring 28 can be brought to an appropriate level. As a result, the vibration absorption performance of the air spring 28 can be ensured.

Further, in this embodiment, the intake valve rod 46D and the exhaust valve rod 46E of the valve 46 can be selectively pressed by the single lever 54. This makes it possible to suppress an increase in the number of parts of the height control unit 42 compared to a configuration in which a plurality of levers are provided to press the intake valve rod 46D and the exhaust valve rod 46E of the valve 46, respectively. It is possible to suppress an increase in the size of the unit 42.

In this embodiment, an example has been described in which the rotation of the lever 54 is limited by the rotatably supported height interlocking part 44, but the present invention is not limited to this. For example, the rotation of the lever 54 may be limited by a height interlocking portion configured to slide in conjunction with the movement of the link mechanism 26.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be implemented with various modifications other than the above without departing from the spirit thereof. Of course.

10 Vehicle seat 12 Seat body 14 Seat support device 22 Upper frame 24 Lower frame 26 Link mechanism (connection part)
28 Air spring 44 Height interlocking part 44A Rotation contact part 44B First contact part 44C Second contact part 46 Valve 46D Air supply valve rod 46E Exhaust valve rod 50 First operation cable 52 Second operation cable 54 Lever 54A Rotation support Part 54B First arm part 54E Second arm part

Claims (3)

an upper frame that supports the seat body on which the occupant is seated from the lower side of the seat;
a lower frame arranged below the seat of the upper frame and fixed to the vehicle body;
a connecting portion that connects the upper frame and the lower frame in a state where the upper frame is movable relative to the lower frame in a seat up-down direction;
A space between the upper frame and the lower frame is provided between the upper frame and the lower frame, and the dimension in the vertical direction of the seat changes depending on the amount of air supplied to the inside, so that the distance between the upper frame and the lower frame in the vertical direction of the seat can be adjusted. An air spring that changes
It includes an air supply valve rod and an exhaust valve rod, and when the air supply valve rod is pressed, air can be supplied to the air spring, and when the exhaust valve rod is pressed, the air spring can be supplied with air. a valve that allows air to be discharged from the
a rotation support part rotatably supported around a predetermined axis; a first arm extending from the rotation support part and to which a first operation cable is connected; a second arm part extending in a different direction from the first arm part and to which a second operating cable is connected, the second arm part being rotated to one side when the first operating cable is operated; A single lever in which the first arm presses the intake valve stem, and when the second operating cable is operated, the second arm presses the exhaust valve stem by rotating to the other side. and,
Displaced to a position corresponding to the distance between the upper frame and the lower frame in the seat vertical direction, and abutted against the second arm portion in a state where the position of the upper frame with respect to the lower frame has reached an upper limit position. and restricting the rotation of the lever to one side due to the operation of the first operating cable, and abutting the first arm portion in a state where the position of the upper frame relative to the lower frame has reached a lower limit position. and a height interlocking part that limits rotation of the lever to the other side by operation of the second operation cable;
Seat support device with. The height interlocking part is configured to include a rotating contact part that is disposed adjacent to the lever and is rotatably supported,
The rotational contact portion includes a first contact portion and a second contact portion spaced apart from each other in the rotational circumferential direction thereof,
When the position of the upper frame relative to the lower frame has reached the upper limit position, the first contact portion is separated from the first arm portion, and the second contact portion is in contact with the second arm portion. It is in contact with
When the position of the upper frame relative to the lower frame has reached the lower limit position, the first contact portion is in contact with the first arm portion, and the second contact portion is separated from the second arm portion. The seat support device according to claim 1, wherein: A seat body on which a passenger sits;
an upper frame that supports the seat body from a lower side of the seat;
a lower frame arranged below the seat of the upper frame and fixed to the vehicle body;
a connecting portion that connects the upper frame and the lower frame in a state where the upper frame is movable relative to the lower frame in a seat up-down direction;
A space between the upper frame and the lower frame is provided between the upper frame and the lower frame, and the dimension in the vertical direction of the seat changes depending on the amount of air supplied to the inside, so that the distance between the upper frame and the lower frame in the vertical direction of the seat can be adjusted. An air spring that changes
It includes an air supply valve rod and an exhaust valve rod, and when the air supply valve rod is pressed, air can be supplied to the air spring, and when the exhaust valve rod is pressed, the air spring can be supplied with air. a valve that allows air to be discharged from the
a rotation support part rotatably supported around a predetermined axis; a first arm extending from the rotation support part and to which a first operation cable is connected; a second arm part extending in a different direction from the first arm part and to which a second operating cable is connected, the second arm part being rotated to one side when the first operating cable is operated; A single lever in which the first arm presses the intake valve stem, and when the second operating cable is operated, the second arm presses the exhaust valve stem by rotating to the other side. and,
Displaced to a position corresponding to the distance between the upper frame and the lower frame in the seat vertical direction, and abutted against the second arm portion in a state where the position of the upper frame with respect to the lower frame has reached an upper limit position. and restricting the rotation of the lever to one side due to the operation of the first operating cable, and abutting the first arm portion in a state where the position of the upper frame relative to the lower frame has reached a lower limit position. and a height interlocking part that limits rotation of the lever to the other side by operation of the second operation cable;
A vehicle seat equipped with