JP7334307B1 - Seat support device and vehicle seat - Google Patents

Abstract

An object of the present invention is to secure vibration absorption performance in a state where a seat surface is at an upper limit position or a lower limit position.
A seat support device is capable of supplying air to an air spring by pressing an air supply valve stem 46D, and is capable of discharging air from the air spring by pressing an exhaust valve stem 46E. A valve 46 , a first lever 62 supported by a first shaft portion 60 , a second lever 66 supported by a second shaft portion 64 , and a height interlocking portion 44 are provided. The height interlocking portion 44 permits movement of the first shaft portion 60 and restricts movement of the second shaft portion 64 in a state where the position of the upper frame relative to the lower frame has reached the upper limit position. The movement of the second shaft portion 64 is allowed and the movement of the first shaft portion 60 is restricted when the position relative to has reached the lower limit position.
[Selection drawing] Fig. 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 shaft portion provided so as to be movable in a direction in which the air supply valve stem is pressed and a direction opposite to this direction, and a first operation cable which is rotatably supported by the first shaft portion and which is connected to the first shaft portion. When the first operation cable is operated in a state in which the movement of the first shaft is restricted, it rotates and presses the intake valve stem, allowing the movement of the first shaft. When the first operation cable is operated in this state, the first lever rotates in a state in which the air supply valve stem cannot be pushed, and the exhaust valve stem moves in the direction in which it is pushed and in the direction opposite to this direction. A possibly provided second shaft portion is rotatably supported by the second shaft portion and a second operation cable is connected to the second shaft portion so that the movement of the second shaft portion is restricted. The operating cable is rotated to press the exhaust valve stem by being operated, and the exhaust valve stem is pressed by operating the second operating cable in a state in which the movement of the second shaft portion is permitted. The upper frame and the lower frame are displaced to a position corresponding to the space in the seat vertical direction between the second lever rotating in a disabled state and the position of the upper frame with respect to the lower frame reaching the upper limit position. The movement of the first shaft is allowed and the movement of the second shaft is restricted in a state in which the upper frame is positioned relative to the lower frame, and the movement of the second shaft is permitted 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 part for limiting the movement of the first shaft part.

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 in a state in which the movement of the first shaft is restricted, the first lever supported by the first shaft rotates, and the first lever supplies air. Press the valve stem. Air is thereby supplied to the air spring. Further, when the second operation cable is operated while the movement of the second shaft portion is restricted, the second lever rotates and presses the exhaust valve rod. 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 first 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 lever presses the exhaust valve stem by operating the second operation 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 allows the movement of the first shaft portion and restricts the movement of the second shaft portion. Therefore, even if the first operating cable is operated to rotate the first lever supported by the first shaft portion, the first lever cannot press the intake valve stem. 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 allows the movement of the second shaft portion and restricts the movement of the first shaft portion. Therefore, even if the second operating cable is operated to rotate the second lever supported by the second shaft portion, the second lever cannot press the intake valve rod. 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 second aspect, wherein the height interlocking portion is arranged adjacent to the first shaft portion and the second shaft portion and is rotatable. A permissible recess having an open radial direction outer side is formed in a part of the outer peripheral portion of the rotating contact portion, and the upper frame of the When the position with respect to the lower frame has reached the upper limit position, the first shaft portion is arranged in the allowance recess to allow the movement of the first shaft portion, and the position of the upper frame with respect to the lower frame. reaches the lower limit position, the movement of the second shaft portion is permitted by arranging the second shaft portion in the allowable recess.

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 movement of the first shaft portion is allowed by arranging it in the allowable recessed portion. Therefore, even if the first operating cable is operated to rotate the first lever supported by the first shaft portion, the first lever cannot press the intake valve stem. Further, in a state where the position of the upper frame with respect to the lower frame has reached the lower limit position, the movement of the second shaft portion is permitted by arranging it in the allowable recessed portion. Therefore, even if the second operating cable is operated to rotate the second lever supported by the second shaft portion, the second lever cannot press the exhaust valve stem. As described above, in the present invention, 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, the position of the seat surface of the seat body is set to the upper limit position or the lower limit position. In this state, the vibration absorption performance of the air spring can be ensured.

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 first shaft portion provided movably in a direction in which the air supply valve rod is pressed and a direction opposite to this direction, and a first shaft portion rotatably supported by the first shaft portion; 1 operation cable is connected, and when the first operation cable is operated in a state where the movement of the first shaft portion is restricted, the first operation cable is rotated to press the air supply valve stem, thereby moving the first shaft portion. A first lever that rotates the intake valve rod in a state in which it cannot be pushed by operating the first operation cable in a state in which movement is permitted, a direction in which the exhaust valve rod is pushed, and this direction. is rotatably supported by the second shaft portion provided movably in the opposite direction, and a second operation cable is connected to the second shaft portion to limit the movement of the second shaft portion When the second operation cable is operated in the state of 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 seat vertical direction, and the position of the upper frame with respect to the lower frame is changed. The movement of the first shaft is allowed and the movement of the second shaft is restricted when the upper frame reaches the upper limit position, and when the position of the upper frame relative to the lower frame reaches the lower limit position, the second shaft is allowed to move. a height interlocking part that allows movement of the two shafts and restricts movement of the first shaft.

The vehicle seat of the third aspect has the configuration of the seat support device of 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, and the first lever with the first operation cable pulled is indicated by a chain double-dashed line. FIG. 11 is a side view schematically showing the height control unit, and the second lever with the second operation cable pulled is indicated by a chain double-dashed line. FIG. 11 is a side view schematically showing the height control unit, showing a state in which the first lever is rotated by pulling the first operation cable while allowing the movement of the first shaft. FIG. 10 is a side view schematically showing the height control unit, showing a state in which the second lever is rotated by pulling the second operation cable while allowing the movement of the second shaft 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, a first shaft portion 60, a first lever 62, a second shaft portion 64, a second 2 levers 66 are included.

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 opposite side of the casing 46A to a first lever 62 and a second lever 64, 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 first lever 62 and a second lever 64, 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 68 that covers the base portion 48A. 3 to 7, only the first elongated holes 68A and the second elongated holes 68B formed in the cover portion 68 are indicated by solid lines.

As shown in FIG. 3, the base portion 48A includes a plate-shaped base plate portion 48B. The valve 46 is fixed to the base plate portion 48B, and a first lever 62, a second lever 66, etc., which will be described later, are supported.

The base plate portion 48B and the cover portion 68 of the base portion 48A are formed with a first elongated hole 68A in which one end and the other end of the cylindrical first shaft portion 60 are respectively supported. It is The first long hole 68A is formed in a long hole shape whose longitudinal directions are the direction in which the air supply valve rod 46D is pushed (direction of arrow B1) and the direction opposite to this direction. One end and the other end of the first shaft portion 60 are supported by a first long hole 68A formed in the base plate portion 48B and a first long hole 68A formed in the cover portion 68, respectively. be. As a result, the first shaft portion 60 can move along the first elongated hole 68A in the direction in which the air supply valve rod 46D is pressed (the direction of the arrow B1) and in the direction opposite to this direction. .

A second elongated hole 68B in which one end and the other end of a cylindrical second shaft portion 64 are supported in the base plate portion 48B and the cover portion 68 of the base portion 48A. is formed. The second long hole 68B is formed in a long hole shape whose longitudinal directions are the direction in which the exhaust valve rod 46E is pressed (direction of arrow B1) and the direction opposite to this direction. One end and the other end of the second shaft portion 64 are supported by a second elongated hole 68B formed in the base plate portion 48B and a second elongated hole 68B formed in the cover portion 68, respectively. be. As a result, the second shaft portion 64 can move along the second elongated hole 68B in the direction in which the exhaust valve rod 46E is pressed (the arrow B1 direction) and in the direction opposite to this direction.

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 first lever 62 is arranged at a position adjacent to the intake valve stem 46D of the valve 46, and is rotatably supported by the first shaft portion 60. As shown in FIG. The first lever 62 and the first shaft portion 60 may be configured as one component, or may be configured as two components. More specifically, the first lever 62 has a first arm portion 62A extending from the first shaft portion 60 side toward the intake valve rod 46D side. The first arm portion 62A includes an air supply valve rod pressing portion 62B that is arranged close to the tip of the air supply valve rod 46D. Further, the end portion of the first arm portion 62A opposite to the first shaft portion 60 serves as a cable locking portion 62C to which the first control cable 50A is locked.

The second lever 66 is arranged at a position adjacent to the exhaust valve stem 46E of the valve 46 and is rotatably supported by the second shaft portion 64 . The second lever 66 and the second shaft portion 64 may be configured as one component, or may be configured as two components. More specifically, the second lever 66 has a second arm portion 66A extending from the second shaft portion 64 side toward the exhaust valve rod 46E side. The second arm portion 66A includes an exhaust valve rod pressing portion 66B that is arranged close to the tip of the exhaust valve rod 46E. Further, the end portion of the second arm portion 66A opposite to the second shaft portion 64 serves as a cable locking portion 66C 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 first lever 62 and the second lever 66, and is rotatably supported by the base plate portion 48B and the cover portion 68 of the housing 48. there is Specifically, the height interlocking portion 44 includes a rotary contact portion 44A that is rotatably supported by the base plate portion 48B and the cover portion 68. As shown in FIG. The rotary contact portion 44A includes a cam portion 44E that is arranged in close proximity to the first shaft portion 60 and the second shaft portion 64. As shown in FIG. The shape of the cam portion 44E when viewed from the rotation axis direction of the rotary contact portion 44A is formed in a substantially circular shape in which a portion of the outer peripheral portion is recessed toward the shaft center side. Here, the portion of the outer peripheral portion of the cam portion 44E that is recessed toward the center of the shaft will be referred to as the allowable recessed portion 44F.

The height interlocking portion 44 also includes an interlocking arm portion 44D that extends from the rotary contact portion 44A toward the side opposite to the first lever 62 and the second lever 66 . 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.

2, 4 and 5, when the height of the upper frame 22 with respect to the lower frame 24 is positioned at an intermediate position, the first shaft portion 60 is positioned in the direction indicated by the arrow in the first elongated hole 68A. It is located at the end in the B1 direction. In this state, the movement of the first shaft portion 60 within the first elongated hole 68A is restricted by the outer peripheral portion of the cam portion 44E. That is, the first shaft portion 60 cannot move from the end in the arrow B1 direction in the first long hole 68A to the opposite side to the arrow B1 direction. Similarly, when the height of the upper frame 22 with respect to the lower frame 24 is positioned at an intermediate position, the second shaft portion 64 is positioned at the end in the arrow B1 direction inside the second elongated hole 68B. there is In this state, the movement of the second shaft portion 64 within the second long hole 68B is restricted by the outer peripheral portion of the cam portion 44E. That is, the second shaft portion 64 cannot move from the end in the arrow B1 direction in the second long hole 68B to the opposite side to the arrow B1 direction. 4 and 5 as well as FIGS. 6 and 7 used in the later description, some reference numerals are omitted in consideration of the visibility of the drawings.

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 first lever 62 moves to one side (arrow A3 direction). As it rotates, the intake valve stem pressing portion 62B of the first lever 62 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 second lever 66 is pulled to one side (arrow A4 direction side). ), and the exhaust valve stem pressing portion 66B of the second 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 shaft portion 60 is placed in the allowable concave portion 44F of the cam portion 44E. As a result, the first shaft portion 60 can move from the end in the direction of the arrow B1 in the first long hole 68A to the end on the opposite side to the direction of the arrow B1. In this state, when an occupant seated on the seat body 12 pulls the first control cable 50A of the first operation cable 50, the first lever 62 rotates to one side (arrow A3 direction side) while the first shaft portion 60 is pulled. moves in the direction opposite to the arrow B1 direction. This prevents the intake valve stem pressing portion 62B of the first lever 62 from pressing the intake valve stem 46D. 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. When the position of the upper frame 22 relative to the lower frame 24 reaches the upper limit position, the movement of the second shaft portion 64 within the second elongated hole 68B is restricted by the outer peripheral portion of the cam portion 44E. Therefore, by pulling the second control cable 52A of the second operation cable 52, the second lever 66 can be rotated to one side and the air in the air spring 28 can be discharged.

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 shaft portion 64 is placed in the allowable concave portion 44F of the cam portion 44E. As a result, the second shaft portion 64 can move from the end in the direction of the arrow B1 in the second long hole 68B to the end on the opposite side to the direction of the arrow B1. In this state, when an occupant seated on the seat body 12 pulls the second control cable 52A of the second operation cable 52, the second lever 66 rotates to one side (arrow A4 direction side) while the second shaft portion 64 is pulled. moves in the direction opposite to the arrow B1 direction. This prevents the exhaust valve stem pressing portion 66B of the second lever 66 from pressing the exhaust valve stem 46E. As a result, when the seat surface 16A of the seat body 12 reaches the lower limit position, the air inside the air spring 28 is prevented from being discharged, and the pressure inside the air spring 28 is prevented from becoming excessively low. be able to. When the position of the upper frame 22 relative to the lower frame 24 reaches the lower limit position, the movement of the first shaft portion 60 within the first elongated hole 68A is restricted by the outer peripheral portion of the cam portion 44E. Therefore, by pulling the first control cable 50</b>A of the first operation cable 50 , the first lever 62 can be rotated to one side to supply air into the air spring 28 .

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.

In this embodiment, an example in which the movement of the first shaft portion 60 and the second shaft portion 64 is restricted and permitted by the height interlocking portion 44 supported rotatably has been described, but the present invention is limited to this. not. For example, the movement of the first shaft portion 60 and the second shaft portion 64 may be restricted and allowed 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 Rotating contact portion 44F Allowable concave portion 46 Valve 46D Air supply valve stem 46E Exhaust valve stem 50 First operation cable 52 Second operation cable 60 First shaft portion 62 First lever 64 Second shaft Part 66 Second lever

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 first shaft portion provided movably in a direction in which the air supply valve stem is pressed and in a direction opposite to this direction;
It is rotatably supported by the first shaft portion and connected to the first operation cable, and is rotated by operating the first operation cable in a state in which the movement of the first shaft portion is restricted. to press the air supply valve stem, and the first operating cable is operated in a state in which the movement of the first shaft portion is permitted to rotate the air supply valve stem in a non-pressible state. a lever;
a second shaft portion provided movably in a direction in which the exhaust valve stem is pressed and in a direction opposite to this direction;
It is rotatably supported by the second shaft portion and connected to the second operation cable, and is rotated by operating the second operation cable in a state where the movement of the second shaft portion is restricted. a second lever that presses the exhaust valve stem and rotates the exhaust valve stem in a state where the exhaust valve stem cannot be pressed by operating the second operation cable in a state in which the movement of the second shaft is allowed; ,
Displacement to a position corresponding to the space between the upper frame and the lower frame in the vertical direction of the seat, and the movement of the first shaft portion is permitted in a state where the position of the upper frame with respect to the lower frame has reached an upper limit position. In addition, the movement of the second shaft is restricted, the movement of the second shaft is allowed in a state where the position of the upper frame with respect to the lower frame has reached the lower limit, and the movement of the first shaft is prohibited. a restricting height interlocking part;
A seat support device with a the height interlocking portion includes a rotary contact portion arranged adjacent to the first shaft portion and the second shaft portion and rotatably supported;
A permissible concave portion having an open outer side in the radial direction of rotation is formed in a part of the outer peripheral portion of the rotary contact portion,
When the position of the upper frame with respect to the lower frame reaches the upper limit position, the first shaft portion is arranged in the allowable recess to allow movement of the first shaft portion,
2. The method according to claim 1, wherein when the position of the upper frame with respect to the lower frame reaches the lower limit position, the movement of the second shaft portion is permitted by arranging the second shaft portion in the allowable recess. A seat support device as described. 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 first shaft portion provided movably in a direction in which the air supply valve stem is pressed and in a direction opposite to this direction;
It is rotatably supported by the first shaft portion and connected to the first operation cable, and is rotated by operating the first operation cable in a state in which the movement of the first shaft portion is restricted. to press the air supply valve stem, and the first operating cable is operated in a state in which the movement of the first shaft portion is permitted to rotate the air supply valve stem in a non-pressible state. a lever;
a second shaft portion provided movably in a direction in which the exhaust valve stem is pressed and in a direction opposite to this direction;
It is rotatably supported by the second shaft portion and connected to the second operation cable, and is rotated by operating the second operation cable in a state where the movement of the second shaft portion is restricted. a second lever that presses the exhaust valve stem and rotates the exhaust valve stem in a state where the exhaust valve stem cannot be pressed by operating the second operation cable in a state in which the movement of the second shaft is permitted; ,
Displacement to a position corresponding to the space between the upper frame and the lower frame in the vertical direction of the seat, and the movement of the first shaft portion is permitted in a state where the position of the upper frame with respect to the lower frame has reached an upper limit position. In addition, the movement of the second shaft is restricted, the movement of the second shaft is allowed in a state where the position of the upper frame with respect to the lower frame has reached the lower limit, and the movement of the first shaft is prohibited. a restricting height interlocking part;
A vehicle seat with