JP7334306B1 - Seat support device and vehicle seat - Google Patents

Abstract

An object of the present invention is to ensure vibration absorption performance in a state where a seat surface is at an upper limit position or a lower limit position. [Solution] The seat support device can supply air to an air spring by pressing an air supply valve rod 46D, and can exhaust air from the air spring by pressing an exhaust valve rod 46E. It includes a valve 46, a single lever 54, and a height interlock 44. The height interlocking part 44 is brought into contact with the second arm part 54E of the lever 54 when the position of the upper frame relative to the lower frame has reached the upper limit position, so that the height interlocking part 44 can be moved to one side of the lever 54 by operating the first operating cable 50. Limit rotation to. Further, the height interlocking part 44 contacts the first arm part 54B of the lever 54 when the position of the upper frame relative to the lower frame has reached the lower limit position, so that the lever 54 can be moved by operating the second operating cable 52. Limit rotation to the other side. [Selection diagram] Figure 3

Description

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

Japanese Unexamined Patent Application Publication No. 2002-100002 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 includes a valve for taking air in and out of an air spring capable of adjusting the height of the seating surface of the seat. and a second camshaft.

A first cam having a pair of wing portions and a cam portion is supported on the first cam shaft so as to be rotatable with respect to the first cam shaft. On the other hand, a second cam having a pair of pressing portions and a concave portion is rotatably supported on the second cam shaft. The cam portion of the first cam is inserted into the concave portion of the second cam. When the first cam rotates, the second cam also rotates, and the pushing portion pushes the intake valve stem 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 to raise the seating surface of the seat, and when the exhaust valve stem is pushed by the second cam, the air in the air spring is discharged. The seating surface of the seat is designed to be lowered.

JP 2011-213287 A

By the way, in the prior art disclosed in Patent Document 1, the valve is in a state of being biased by a compression coil spring. In addition, a cable is locked to this valve, and when this cable is pulled, the valve is moved in the direction in which the compression coil spring is compressed. , the valve is moved.

On the other hand, in a state in which the cable is not operated, a position transmission pin arranged at a predetermined position is engaged with a recess provided at the boundary between the pair of wings of the first cam. When the cable is operated, the valve moves relative to the position transmission pin, and the wings of the first cam are pushed by the position transmission pin, causing the first cam to rotate. As a result, the second cam rotates.

However, in the prior art described in Patent Document 1, even when the seat surface of the seat is raised to the upper limit position, the cable is operated to rotate the first cam and the second cam to rotate the air spring. air can be supplied to For this reason, when the seat surface of the seat is raised to the upper limit position, the pressure inside the air spring becomes excessively high, and it is conceivable that the air spring cannot sufficiently exhibit its vibration absorbing performance.

Further, in the prior art described in Patent Document 1, even when the seat surface of the seat is lowered to the lower limit position, the cable is operated to rotate the first cam and the second cam to rotate the air spring. Air can be expelled from the Therefore, when the seating surface of the seat is lowered to the lower limit position, the pressure inside the air spring becomes excessively low, and the vibration absorbing performance of the air spring cannot be exhibited sufficiently.

In other words, the prior art described in Patent Document 1 has room for improvement in terms of securing vibration absorption performance in a state where the seating surface of the seat is at the upper limit position or the lower limit position.

SUMMARY OF THE INVENTION An object of the present invention is to provide 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.

A seat support device according to a first aspect includes an upper frame that supports a seat body on which an occupant sits from the lower side of the seat, a lower frame that is arranged on the lower side of the seat of the upper frame and is fixed to a vehicle body, and the upper frame. is provided between a connecting portion that connects the upper frame and the lower frame in a state in which the upper frame and the lower frame are movable relative to the lower frame in the vertical direction of the seat; an air spring whose dimension in the vertical direction of the seat changes according to the amount of air applied to change the space between the upper frame and the lower frame in the vertical direction of the seat; an intake valve stem; and an exhaust valve stem. a valve capable of supplying air to the air spring by pressing the air supply valve stem and discharging air from the air spring by pressing the exhaust valve stem; a first arm portion extending from the rotation support portion and to which a first operation cable is connected; and from the rotation support portion to the a second arm portion extending in a direction different from that of the first arm portion and to which a second operation cable is connected, the second arm portion being rotated to one side by operating the first operation cable; A single lever in which the first arm presses the intake valve stem, and the second arm rotates to the other side by operating the second operation cable, and the second arm presses the exhaust valve stem. , the upper frame and the lower frame are displaced to a position corresponding to the space between the upper frame and the lower frame in the vertical direction of the seat, and the position of the upper frame with respect to the lower frame reaches the upper limit position, and the upper frame contacts the second arm portion. This restricts the rotation of the lever to one side due to the operation of the first operation cable, and makes contact with the first arm portion in a state where the position of the upper frame with respect to the lower frame has reached the lower limit position. and a height interlocking portion that restricts the rotation of the lever to the other side due to the 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 can move relative to the lower frame in the vertical direction of the seat.

An air spring is provided between the upper frame and the lower frame. The air spring changes its dimension in the vertical direction of the seat according to the amount of air supplied to the inside, 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 intake valve stem and an exhaust valve stem. When the intake valve stem is pressed, air is supplied to the air spring, and when the exhaust valve stem is pressed, the 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 portion of the lever presses the intake valve stem. Air is thereby supplied to the air spring. Also, when the second operation cable is operated, the lever rotates to the other side, and the second arm portion of the lever presses the exhaust valve stem. Air is thereby discharged 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 with respect to the lower frame. At this time, if the first operating cable is operated to press the air supply valve stem with the lever and air is supplied to the air spring, the pressure inside the air spring may become excessively high. Further, if air continues to be discharged from the air spring, the upper frame will descend to the lower limit position with respect to the lower frame. At this time, if the second arm presses the exhaust valve stem by operating the second operating cable and the air is discharged from the air spring, the pressure in the air spring may become excessively low. In such cases, it is conceivable that the vibration absorbing performance of the air spring cannot be exhibited sufficiently.

Here, in the present invention, the height interlocking portion is provided, and the height interlocking portion is displaced to a position corresponding to the space between the upper frame and the lower frame in the vertical direction of the seat. When the position of the upper frame with respect to the lower frame reaches the upper limit position, the height interlocking portion abuts against the second arm portion, thereby restricting the rotation of the lever to one side due to the operation of the first operation cable. be done. As a result, the supply of air to the air spring is suppressed, and the pressure inside the air spring can be suppressed from becoming excessively high. On the other hand, when the position of the upper frame with respect to the lower frame reaches the lower limit position, the height interlocking portion contacts the first arm portion, and the lever is rotated to the other side by the operation of the second operation cable. is restricted. As a result, the air in the air spring is prevented from being discharged, and the pressure in the air spring is prevented from becoming excessively low. Thus, in the present invention, when the position of the upper frame with respect to the lower frame reaches the upper limit position or the lower limit position, that is, when the position of the seat surface of the seat body reaches the upper limit position or the lower limit position, The vibration absorption performance of the air spring can be secured.

A seat support device according to a second aspect is the seat support device according to the first aspect, wherein the height interlocking portion includes a rotary contact portion arranged adjacent to the lever and rotatably supported. The rotary contact portion has a first contact portion and a second contact portion spaced apart in the circumferential direction of rotation thereof, and the position of the upper frame with respect to the lower frame is an upper limit position. , 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 reaches 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.

According to the seat support device of the second aspect, the rotating contact portion rotates to a position corresponding to the space between the upper frame and the lower frame in the vertical direction of the seat. When the position of the upper frame with respect to the lower frame reaches the upper limit position, the first contact portion of the rotary contact portion is separated from the first arm portion, and the second contact portion of the rotary contact portion is closed. It abuts on the second arm portion. As a result, the rotation of the lever to one side due to the operation of the first operation cable is restricted. Further, when the position of the upper frame with respect to the lower frame reaches the lower limit position, the first contact portion of the rotary contact portion is in contact with the first arm portion, and the second contact portion of the rotary contact portion is in contact with the first arm portion. It is separated 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. Thus, in the present invention, rotation of the lever can be restricted by rotating the rotating contact portion to a position corresponding to the space between the upper frame and the lower frame in the vertical direction of the seat.

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 the seat lower side, and a lower frame that is arranged on the seat lower side of the upper frame and fixed to a vehicle body. a connecting portion connecting the upper frame and the lower frame in a state in which the upper frame is movable relative to the lower frame in the vertical direction of the seat; 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 inside thereof, and which changes the space between the upper frame and the lower frame in the vertical direction of the seat; an air supply valve rod; and a valve stem, wherein 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 valve, a rotation support portion supported so as to be rotatable about a predetermined axis, a first arm portion extending from the rotation support portion and to which a first operation cable is connected, the rotation a second arm portion extending from the motion support portion in a direction different from the first arm portion and to which a second operation cable is connected, wherein the first operation cable is operated to move to one side; The first arm rotates to press 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 space between the single lever and the upper frame and the lower frame in the vertical direction of the seat, and the position of the upper frame with respect to the lower frame has reached the upper limit position. By abutting on the arm portion, the rotation of the lever to one side due to the operation of the first operation cable is restricted, and the position of the upper frame with respect to the lower frame reaches the lower limit position. a height interlocking portion that abuts on the arm portion to limit the rotation of the lever to the other side due to the operation of the second operation cable.

A vehicle seat according to a third aspect has the configuration of the seat support device according to the first aspect. As a result, the vibration absorbing performance of the air spring can be ensured when 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 the excellent effect of being able to ensure vibration absorption performance in a state where the seat surface is at the upper limit position or the lower limit position.

It is a perspective view showing a vehicle seat of this embodiment. It is a side view showing a vehicle seat of this embodiment. FIG. 4 is a side view schematically showing the height control unit; FIG. 4 is a side view schematically showing the height control unit, showing a state in which the first operation cable is pulled; FIG. 4 is a side view schematically showing the height control unit, showing a state in which the second operation cable is pulled; FIG. 4 is a side view schematically showing the height control unit, showing a state where the first contact portion of the rotary contact portion is in contact with the first arm portion; FIG. 4 is a side view schematically showing the height control unit, showing a state where the second contact portion of the rotary 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 with reference to FIGS. 1 to 3. FIG. An arrow FR, an arrow UP, an arrow RH, and an arrow LH shown in the drawing respectively indicate the seat front side, upper side, right side, and left side as seen from the passenger seated on the vehicle seat 10 . In the following description, when simply using front-rear, up-down, and left-right directions, front-rear in the seat front-rear direction, up and down in the seat up-down direction, and left and right in the seat left-right direction will be indicated unless otherwise specified. Also, the lateral direction of the seat coincides with the width direction of the seat.

As shown in FIG. 1, a vehicle seat 10 of this 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 that it can be raised and lowered in the vertical direction. there is

The seat body 12 includes a seat cushion 16 having a "seat surface 16A" on which an occupant sits, a seatback 18 supporting the back of the occupant, and a headrest 20 supporting the head of the occupant. 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, air springs 28 and dampers 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 spaced apart in the left and right direction, and a pair of front and rear lateral members (not shown) connecting the front and rear ends of the pair of left and right rail members 22A in the left and right direction, respectively. and As a result, the upper frame 22 has a rectangular frame shape when viewed from above.

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

The lower frame 24 is arranged below the upper frame 22 and fixed to the floor of the vehicle body (not shown). The lower frame 24 includes a pair of left and right rail members 24A spaced apart in the left and right direction, and a pair of front and rear lateral members (not shown) connecting the front and rear ends of the pair of left and right rail members 24A in the left and right direction, respectively. and As a result, the shape of the lower frame 24 viewed from above is a rectangular frame shape.

Further, the longitudinal center portions of the pair of rail members 24A are connected to each other via a plate-shaped lower support plate portion 34 whose plate thickness direction is the vertical direction. An air spring 28 is attached as will be described later.

The link mechanism 26 has 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 . Also, the X link 36 has a first link portion 38 that slopes downward from the front side to the rear side, and a second link portion 40 that slopes upward from the front side to the rear side. , is equipped with The first link portion 38 and the second link portion 40 are rotatably connected at the central portion in the front-rear direction with the left-right direction as the axial direction. By rotating the first link portion 38 relative to the second link portion 40 , the upper frame 22 is allowed 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 in which 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 an axial direction extending in the vertical direction. are 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) forming 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 the vertical movement of the seat body 12 .

The air spring 28 expands in the vertical direction when air is supplied, and contracts in the vertical direction when the air is discharged. Accordingly, in the present embodiment, the expansion of the air spring 28 causes the upper frame 22 to move upward, and the contraction of the air spring 28 causes the upper frame 22 to move downward. In other words, 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 . Vibration generated in the seat body 12 can be damped by the damper 30 .

Here, 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 with the height control unit 42 shown in FIG. Further, 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 portion 44 shown in FIG. The configurations of the height control unit 42 and the height interlocking section 44, which constitute the essential parts of the present embodiment, will be described in detail below. In the following description, unless otherwise specified, it is assumed that the height of the upper frame 22 with respect to the lower frame 24 is at an intermediate position between the upper limit position and the lower limit position in the vertical direction. It is assumed that

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 .

The valve 46 includes a casing 46A, a first port 46B, a second port 46C, an intake valve stem 46D, and an exhaust valve stem 46E. As an example, the casing 46A is made of metal, and has a flow path through which air flows. The casing 46A is provided with an air discharge hole 46F that can be communicated with the flow path inside the casing 46A.

A first port 46B and a second port 46C are provided on the side of the casing 46A opposite to the lever 54, which will be described later. An intake valve stem 46D and an exhaust valve stem 46E are provided on the casing 46A on the side of a lever 54, which will be described later.

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

The air supply valve stem 46D can move in and out of the casing 46A along the extension of the first port 46B. A biasing member (not shown) is disposed inside the casing 46A, and the biasing member biases the intake valve stem 46D toward the outside of the casing 46A.

In the valve 46, an air supply valve (not shown) arranged in the casing 46A is opened by pressing the air supply valve rod 46D toward the casing 46A side, and the first port 46B and the second port 46B are connected via the flow path portion. It communicates with the port 46C. That is, in this embodiment, compressed air from the air supply source is supplied to the air spring 28 via the valve 46 when the air supply valve stem 46D is pressed.

On the other hand, the exhaust valve stem 46E can be moved in and out of the casing 46A along the extension of the second port 46C. 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.

When the exhaust valve stem 46E of the valve 46 is pressed toward the casing 46A, an exhaust valve (not shown) arranged in the casing 46A is opened, and the second port 46C and the air discharge hole 46F flow through the flow path. is communicated with. That is, in this embodiment, when the exhaust valve rod 46E is pressed, the air in the air spring 28 is discharged from the air discharge hole 46F of the valve 46. As shown in FIG.

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 plate-shaped base plate portion 48B. A valve 46 is fixed to the base plate portion 48B, and a later-described lever 54 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 side of the first port 46B and the intake valve stem 46D in 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 side of the second port 46C and the exhaust valve rod 46E in the casing 46A.

The lever 54 is arranged to face the intake valve stem 46D and the exhaust valve stem 46E of the valve 46, and is rotatably supported by the base plate portion 48B of the housing 48. As shown in FIG. More specifically, the lever 54 includes a columnar rotation support portion 54A that is rotatably supported by the base plate portion 48B with the thickness direction of the base plate portion 48B as the axial direction.

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

The lever 54 also 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 side. The portion of the second arm portion 54E on the side of the rotation support portion 54A is arranged in proximity to the tip portion of the exhaust valve rod 46E when the first control cable 50A and the second control cable 52A are not operated. It is a valve stem pressing portion 54F. Further, the end portion of the second arm portion 54E on the side opposite to the rotation support portion 54A serves as a cable locking portion 54G to which the second control cable 52A is locked.

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

The height interlocking portion 44 also includes an interlocking arm portion 44D extending from the rotary contact portion 44A toward the side opposite to the lever 54. As shown in FIG. The end portion of the interlocking arm portion 44D opposite to the rotating contact portion 44A is connected to a portion of the aforementioned link mechanism 26 (see FIG. 2). Then, 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 portion 44 rotates and the height interlocking portion 44 is arranged at a position corresponding to the space between the upper frame 22 and the lower frame 24 in the vertical direction of the seat. Here, in this embodiment, when the upper frame 22 rises with respect to the lower frame 24, the height interlocking portion 44 rotates in the arrow A1 direction. On the other hand, when the upper frame 22 descends with respect to the lower frame 24, the height interlocking portion 44 rotates in the direction opposite to the arrow A1.

(Action and effect of the present embodiment)
Next, the operation and effects of this embodiment will be described.

As shown in FIGS. 1, 2, and 3, in the vehicle seat 10 of the present embodiment, a passenger seated on the seat main body 12 operates the first operation cable 50 and the second operation cable 52 to operate the seat. 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 (direction of arrow A2). , the intake valve stem pressing portion 54C of the lever 54 presses the intake valve stem 46D. As a result, compressed air from the air supply source is supplied to the air spring 28 via the valve 46 to raise the upper frame 22 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 is moved to the other side (opposite direction to the arrow A2). 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 discharge hole 46F of the valve 46, and the upper frame 22 is lowered with respect 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, when the position of the upper frame 22 with respect to the lower frame 24 reaches the upper limit position, that is, when the seat surface 16A of the seat body 12 reaches the upper limit position. Then, the height interlocking part 44 is also arranged at a corresponding position. In this state, the first contact portion 44B of the rotary contact portion 44A of the height interlocking portion 44 is separated from the first arm portion 54B, and the second contact portion 44C of the rotary contact portion 44A is separated from the second arm portion. 54E. In a state where the second contact portion 44C of the rotary 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 pulled 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, the supply of air to the air spring 28 is suppressed, and the pressure in the air spring 28 is suppressed from becoming excessively high. can be done. Even if the second contact portion 44C of the rotary contact portion 44A is in contact with the second arm portion 54E, pulling the second control cable 52A of the second operation cable 52 causes the lever 54 to move to the other side (arrow A2 can be rotated in the opposite direction).

2 and 7, when the position of the upper frame 22 with respect to the lower frame 24 reaches the lower limit position, that is, when the seat surface 16A of the seat body 12 reaches the lower limit position. , and the height interlocking portion 44 is also arranged at a corresponding position. In this state, the second contact portion 44C of the rotary 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 rotary contact portion 44A is separated from the first arm portion. 54B. When the first contact portion 44B of the rotary 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 side) cannot be rotated. 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. Even if the first contact portion 44B of the rotary contact portion 44A is in contact with the first arm portion 54B, pulling the first control cable 50A of the first operation cable 50 causes the lever 54 to move to one side (arrow A2 direction side) can be rotated.

As described above, in the present embodiment, when the position of the upper frame 22 with respect to the lower frame 24 reaches the upper limit position or the lower limit position, that is, the position of the seat surface 16A of the seat body 12 reaches the upper limit position or the lower limit position. , the air pressure in the air spring 28 can be brought to an appropriate pressure. As a result, the vibration absorbing performance of the air spring 28 can be ensured.

Also, in this embodiment, the single lever 54 can selectively press the intake valve stem 46D and the exhaust valve stem 46E of the valve 46 . 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 for respectively pressing the intake valve stem 46D and the exhaust valve stem 46E of the valve 46 is provided, and also allows height control. An increase in size of the unit 42 can be suppressed.

In this embodiment, an example in which the rotation of the lever 54 is restricted by the height interlocking portion 44 that is rotatably supported has been described, but the present invention is not limited to this. For example, the rotation of the lever 54 may be restricted 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 in various modifications other than the above without departing from the spirit of the present invention. is of course.

10 vehicle seat 12 seat body 14 seat support device 22 upper frame 24 lower frame 26 link mechanism (connecting portion)
28 Air spring 44 Height interlocking portion 44A Rotary contact portion 44B First contact portion 44C Second contact portion 46 Valve 46D Air supply valve rod 46E Exhaust valve rod 50 First operation cable 52 Second operation cable 54 Lever 54A Rotational support Section 54B First Arm Section 54E Second Arm Section

Claims (3)

an upper frame that supports a seat body on which an occupant sits from the lower side of the seat;
a lower frame disposed 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 in which the upper frame can move relative to the lower frame in the vertical direction of the seat;
Provided between the upper frame and the lower frame, the dimension in the vertical direction of the seat changes according to the amount of air supplied to the inside, and the space between the upper frame and the lower frame in the vertical direction of the seat is reduced. a variable air spring;
An intake valve stem and an exhaust valve stem are provided, and when the intake valve stem is pressed, air can be supplied to the air spring, and when the exhaust valve stem is pressed, the air spring a valve capable of discharging air from
a rotation support portion that is rotatably supported around a predetermined axis; a first arm portion that extends from the rotation support portion and to which a first operation cable is connected; a second arm portion extending in a different direction from the first arm portion and to which a second operation cable is connected, and is rotated to one side by the operation of the first operation cable; A single lever in which the first arm portion presses the intake valve stem, and when the second operation cable is operated, the second arm portion presses the exhaust valve stem to rotate to the other side. and,
The upper frame and the lower frame are displaced to a position corresponding to the space between the upper frame and the lower frame in the vertical direction of the seat, and the upper frame contacts 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 operation cable, and contacting the first arm portion in a state where the position of the upper frame with respect to the lower frame has reached a lower limit position. a height interlocking portion that restricts the rotation of the lever to the other side by the operation of the second operation cable;
A seat support device with a The height interlocking portion includes a rotating contact portion that is arranged adjacent to the lever and is rotatably supported,
The rotating contact portion includes a first contact portion and a second contact portion spaced apart in the circumferential direction of rotation thereof,
When the position of the upper frame with respect to the lower frame reaches 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. is in contact with
When the position of the upper frame with respect to the lower frame reaches 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. 2. The seat support device according to claim 1. a seat body on which an occupant sits;
an upper frame that supports the seat body from the lower side of the seat;
a lower frame disposed 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 in which the upper frame can move relative to the lower frame in the vertical direction of the seat;
Provided between the upper frame and the lower frame, the dimension in the vertical direction of the seat changes according to the amount of air supplied to the inside, and the space between the upper frame and the lower frame in the vertical direction of the seat is reduced. a variable air spring;
An intake valve stem and an exhaust valve stem are provided, and when the intake valve stem is pressed, air can be supplied to the air spring, and when the exhaust valve stem is pressed, the air spring a valve capable of discharging air from
a rotation support portion that is rotatably supported around a predetermined axis; a first arm portion that extends from the rotation support portion and to which a first operation cable is connected; a second arm portion extending in a different direction from the first arm portion and to which a second operation cable is connected, and is rotated to one side by the operation of the first operation cable; A single lever in which the first arm portion presses the intake valve stem, and when the second operation cable is operated, the second arm portion presses the exhaust valve stem to rotate to the other side. and,
The upper frame and the lower frame are displaced to a position corresponding to the space between the upper frame and the lower frame in the vertical direction of the seat, and the upper frame contacts 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 operation cable, and contacting the first arm portion in a state where the position of the upper frame with respect to the lower frame has reached a lower limit position. a height interlocking portion that restricts the rotation of the lever to the other side by the operation of the second operation cable;
A vehicle seat with