JP3568589B2 - Vehicle seat with air suspension device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a vehicle seat provided with an air suspension device that supports a seat cushion of a vehicle seat such as an automobile using a link mechanism and an air spring.
[0002]
[Prior art]
BACKGROUND ART An air suspension device for a vehicle seat used in a cab of a large vehicle such as a truck includes a lower frame fixed on a floor of a vehicle, an upper frame disposed above the lower frame, and the lower frame and the upper frame. And a link mechanism and an air spring disposed between them, so that the load applied to the seat cushion on the upper frame is supported by the pressure of the air spring.
[0003]
In this type of air suspension device, as shown in, for example, Japanese Patent Application Laid-Open No. 5-42849, a seat cushion is maintained at a set reference height in a stationary state irrespective of the weight of a seated person. In order to secure an appropriate suspension stroke with respect to the vibration of the motor and to obtain an optimum damping performance, a method of automatically controlling the internal pressure of an air spring has been proposed.
[0004]
In the prior art, as shown in FIG. 5, a lower frame a fixed on the floor of a vehicle, an upper frame disposed above the lower frame a, and an upper frame vertically moved with respect to the lower frame a. A link mechanism b for supporting as much as possible, an air spring c for supporting a load applied to the upper frame, an air supply source d, and a compression sent from the air supply source d when the upper frame is below a predetermined height. The air supply / exhaust valve e that supplies air to the air spring c and discharges air from the air spring c when the upper frame has a predetermined height or more, and operates the air supply / exhaust valve e according to the height of the upper frame. A valve switching mechanism f for switching the air supply / exhaust valve e to an air supply mode or an exhaust mode by the valve switching mechanism f, thereby controlling the internal pressure of the air spring c to bring the seat cushion to the reference height. So that to equity.
[0005]
The valve switching mechanism f of the prior art includes a guide shaft h, a cam i provided reciprocally on the guide shaft h and rotatably in a vertical direction, and the cam i in conjunction with a vertical movement of a seat cushion. A connecting member j for reciprocating i along the guide shaft h is provided. Further, a first convex portion k and a second convex portion n are provided below the cam i.
[0006]
This type of valve switching mechanism f is such that when the seat cushion descends from the reference height, the cam i moves leftward from the neutral position along the guide shaft h via the connecting member j and moves a certain distance or more. When the lower surface of the cam i rides on the first convex portion k and the cam i rotates upward, the air supply valve rod p of the air supply / exhaust valve e is pushed, and the air supply / exhaust valve e is set to the air supply mode. In the air supply mode, the compressed air sent from the air supply source d is supplied to the air spring c via the air supply / exhaust valve e. As the internal pressure of the air spring c increases, the seat cushion rises and the reference height increases. Return to
[0007]
When the seat cushion rises above the reference height, the cam i moves rightward in the figure from the neutral position, and after moving a certain distance or more, the lower surface of the cam i rides on the second convex portion n, and the cam i rotates. By ascending, the exhaust valve rod r of the supply / exhaust valve e is pushed, and the supply / exhaust valve e is set to the exhaust mode. In the exhaust mode, the air inside the air spring c is exhausted via the air supply / exhaust valve e, so that the internal pressure of the air spring c decreases, so that the seat cushion descends and returns to the reference height.
[0008]
[Problems to be solved by the invention]
The above-described prior art air suspension device is an excellent device that can maintain the seat cushion at the reference height regardless of the weight of the occupant and can secure an appropriate suspension stroke. There was room to be.
[0009]
Engines of large vehicles such as trucks in recent years tend to be equipped with a turbocharger, an intercooler, and the like for high output and high horsepower, and thus the engine room tends to be large. With the enlargement of the engine room, as shown in FIG. 6, the bed installed on the engine room has become higher than before. For this reason, when the occupant of a truck or the like tries to take a necessary rest or nap by falling down the seat back, the following problem may occur.
[0010]
In the above-described air suspension device, when a seated person is lifted to lower the seatback, the seating load on the seat cushion is reduced. Moreover, when the seatback is tilted, the center of gravity of the seated person and the center of gravity of the seatback move rearward, so that the seating load on the seat cushion is further reduced. When the seating load decreases in this manner, the seat cushion rises due to the reaction force of the air spring. When the seat cushion is raised, the above-mentioned air supply / exhaust valve e is set to the exhaust mode, and the seat cushion and the seat back start to lower. As a result, the seat back comes into contact with the edge of the bed and crushes the bed.
[0011]
Even if the seat back comes into contact with the bed as described above, the air supply / exhaust valve e remains in the exhaust mode until the seat cushion reaches the neutral position (reference height). It will be deformed. Further, the seat itself is lowered forward by the series of operations described above, and it becomes difficult for the seated person to take a comfortable posture. Another problem is that the bed is deformed or the entire sheet is distorted.
[0012]
As an improvement to solve the above-described problem, the second convex portion n of the valve switching mechanism f described above is configured to be able to protrude and retract, and the second convex portion n is connected to the movement of the reclining mechanism via a wire cable or the like. Something to work with was considered. In other words, when the seat back is tilted backward by a predetermined angle or more, the convex portion n is retracted by pulling the cable so that the supply / exhaust valve e does not enter the exhaust mode when the seat back is tilted. .
[0013]
However, in the above-mentioned improvement plan, since a long cable must be routed from the reclining mechanism to the valve switching mechanism f, special consideration must be given to the cable routing so that the cable is not in the way. In addition, it is necessary to pull the cable by an exact amount when the rearward tilt angle of the seat back reaches a predetermined value, so that it is difficult to set the length and tension of the cable.
[0014]
Accordingly, an object of the present invention is to prevent the air suspension device from operating in the direction in which the seat descends when the seat back is tilted backward during rest or the like, thereby avoiding the above-described problem, and improving the reliability of operation. It is an object of the present invention to provide a vehicle seat provided with an air suspension device which has high performance and can easily perform adjustment and the like.
[0015]
[Means for Solving the Problems]
A vehicle seat of the present invention developed to achieve the above object includes a lower frame provided on a floor side of a vehicle, an upper frame disposed above the lower frame to support a seat cushion, and A seat back provided at a rear portion of the rear frame and capable of changing an inclination angle in a front-rear direction, a link mechanism for supporting the upper frame so as to be vertically movable with respect to the lower frame, and a load applied to the upper frame from above. An air spring for supporting a load, an air supply source for supplying compressed air to the air spring, and an air supply provided between the air supply source and the air spring when the upper frame has a predetermined height or less. When the air supply mode is set to supply the compressed air sent from the air supply source to the air spring and the upper frame is higher than a predetermined height, the air is supplied. A supply / exhaust valve in an exhaust mode for discharging air from the air, a valve switching mechanism for operating the supply / exhaust valve in the air supply mode or the exhaust mode according to the height of the upper frame, the air spring and the air supply Installed between the exhaust valve And an on-off valve attached to the rear of the seat cushion. An opening / closing valve having a valve body operating portion operable in a valve opening mode in which the air in the air spring can be discharged to the supply / exhaust valve side and a valve closing mode in which the air in the air spring cannot be discharged so as not to be discharged; One end The member on the side of the seat back And the other end is connected to the valve element operating portion of the on-off valve. Only when the seat back is tilted backward by a predetermined angle or more, the valve body operating unit is moved to the valve closing mode. Closing the valve body operating portion 65 in a state in which the load applied to the seat cushion by lowering the seat back to the rear is lower than that in normal seating and the seat cushion is raised by the internal pressure of the air spring. The on-off valve is closed by driving in the mode direction A driving member.
[0016]
[Action]
When the seat cushion falls below a predetermined height, such as when the seating load is large, the air supply / exhaust valve is set to the air supply mode, and the compressed air sent from the air supply source is supplied to the air spring, and the internal pressure of the air spring is reduced. The seat cushion rises to the reference height. Conversely, if the seat cushion becomes higher than the predetermined height, such as when the seating load is light, the air supply / exhaust valve is switched to the exhaust mode, air is discharged from the air spring, the internal pressure of the air spring decreases, and the seat cushion is released. Descend.
[0017]
When the seat back is greatly tilted rearward during a rest or the like, the load applied to the seat cushion from above is reduced as compared with the normal seating, and the seat is raised by the internal pressure of the air spring. When the seat back is tilted rearward by a predetermined angle or more, the valve operating portion of the on-off valve is driven in the direction of the valve closing mode via the driving member, and the on-off valve is closed. For this reason, even if the air supply / exhaust valve is in the exhaust mode by the valve switching mechanism with the rise of the seat, the air is prevented from being discharged from the air spring.
[0018]
For this reason, the seat cushion is prevented from lowering with the seat back falling backward, and the height of the seat is maintained. When the seat back is raised to the angle of the normal use state, the movement of the seat back is transmitted to the valve operating portion of the on-off valve via the driving member, and the on-off valve switches to the valve opening mode, so that air is released from the air spring. It can be discharged, and the normal height adjustment function is exhibited.
[0019]
【Example】
One embodiment of the present invention will be described below with reference to FIGS.
The vehicle seat 1 shown in FIGS. 2 and 4 has an air suspension device 2 located on the lower side in the drawing and a tilt mechanism 3 mounted on the air suspension device 2, and the tilt mechanism 3 is provided with a seat cushion 4 on an upper frame 3a. The tilt mechanism 3 can adjust the inclination of the upper frame 3 a with respect to the horizontal plane, and can adjust the position in the front-rear direction by the seat slide mechanism 5.
[0020]
A seat back 6 is provided at a rear portion of the seat cushion 4. As shown in FIG. 3, hinge brackets 7a and 7b are provided below the seat back frame 6a. The seat back 6 is rotatable in the front-rear direction with respect to the seat cushion 4 and can be adjusted to a desired angle by a well-known reclining mechanism (not shown) provided on one hinge bracket 7b side. .
[0021]
The air suspension device 2 includes a lower frame 11 fixed on the floor of the vehicle, an upper frame 12 disposed above the lower frame 11, and a link mechanism 13 that supports the upper frame 12 with respect to the lower frame 11 so as to be able to move up and down. And an air spring 14 (shown in FIG. 1) for supporting a load from above applied to the upper frame 12, and a supply for supplying or exhausting air supplied from an air supply source 15 such as an air compressor to the air spring 14. An exhaust valve 16 and the like are provided. The air spring 14 is provided between the lower frame 11 and the upper frame 12.
[0022]
As shown in FIG. 4 and the like, the link mechanism 13 pivotally connects a pair of right and left link bars 13a and 13b in an X-shape with a pivot pin 13c, and also connects left and right to the upper and lower ends of the link bars 13a and 13b, respectively. (See FIG. 1). Both ends of the upper and lower connecting shafts 13e disposed in the front are rotatably connected to the front ends of the left and right frame members 11a of the lower frame 11 and the upper frame 12, and both ends of the connecting shaft 13e disposed in the rear are connected to the lower. The right and left frame members 11a of the frame 11 and the upper frame 12 are supported so as to be able to move back and forth via rolling rollers 13f near the rear ends.
[0023]
As shown in FIG. 1, the supply / exhaust valve 16 is provided with a normally-closed supply / exhaust valve inside a single casing, and includes a valve stem 17 for the supply valve and a valve for the exhaust valve. The rods 18 protrude in parallel on the same side surface at a predetermined interval. When the valve rod 17 for the air supply valve is pushed in, the air supply valve is opened to enter the air supply mode, and when the valve rod 18 for the exhaust valve is pushed in, the exhaust valve is opened to exhaust air. Mode. When the pushing force of the valve rods 17 and 18 is released, the air supply valve and the exhaust valve are each returned to the closed state by the urging force of a built-in valve spring (not shown).
[0024]
The supply / exhaust valve 16 is attached to one of two members that are relatively displaced with each other as the seat cushion moves up and down. For example, as shown in FIG. 1, the lower frame 11 is horizontally fixed to a rear portion of the lower frame 11 via a mounting base 20. An air pipe 22 communicating with the air supply source 15 is connected to one connection port 16 a of the air supply / exhaust valve 16. The other connection port 16b of the supply / exhaust valve 16 is connected to an air pipe 23 that communicates with the air spring 14 via an on-off valve 51 described later.
[0025]
The supply / exhaust valve 16 is supplied or exhausted by a valve switching mechanism 30. The valve switching mechanism 30 controls the air supply / exhaust valve 16 to increase or decrease the internal pressure of the air spring 14, thereby setting the reference height Y of the seat cushion as shown in FIG. , An upper dead zone B and a lower dead zone C are respectively set.
[0026]
That is, as shown in FIG. 1, the valve switching mechanism 30 includes a horizontally extending round bar-shaped guide shaft 31 supported by the bearing pieces 20 c and 20 d of the mounting base 20, and is reciprocally movable with respect to the guide shaft 31. A cam 32 provided rotatably in the up and down direction, a connecting member 33 for reciprocating the cam 32 along the guide shaft 31 in conjunction with the up and down movement of the seat cushion, and a first member for rotating and raising the cam 32 A projection 34 and a second projection 35 are provided.
[0027]
The cam 32 has a rectangular shape, and has a round hole 32 a penetrating in the front-rear direction at a base end thereof. By inserting the round hole 32 a into the guide shaft 31, the cam 32 is guided in a state facing the air supply / exhaust valve 16. It is reciprocally movable in the front-rear direction along the shaft 31 and is rotatable in the vertical direction.
[0028]
The cam 32 integrally has at its tip a head portion 32b having a width substantially equal to the distance between the valve rods 17 and 18 of the supply / exhaust valve 16. The head portion 32b does not contact the valve rods 17 and 18 of the supply / exhaust valve 16 even if the cam 32 moves back and forth along the guide shaft 31 while the cam 32 is in a horizontal state. Moreover, the head portion 32b is formed in such a shape that one of the valve rods 17 and 18 of the supply / exhaust valve 16 can be pushed in when the cam 32 rotates upward around the guide shaft 31. When the head portion 32b once pushes the valve stems 17 and 18, the head portion 32b is stretched by the urging force of the built-in springs of the valve stems 17 and 18 and the rotation return of the cam 32 downward is prevented. Thus, the pushed state of the valve stems 17, 18 is maintained.
[0029]
The connecting member 33 includes one connecting rod 33b having a U-shaped member 33a at the rear end as shown in FIG. 1 and a connecting lever 33c fastened in a state orthogonal to the front end of the connecting rod 33b. I have. The distal end of the connecting lever 33c is inserted into a slit 32i formed at the base end of the cam 32 so that the connecting lever 33c can move with the cam 32 in the front-rear direction with respect to the guide shaft 31. The U-shaped member 33a at the rear end of the connecting rod 33b is engaged with the connecting shaft 13e of the link mechanism 13.
[0030]
The first convex portion 34 and the second convex portion 35 protrude between the air supply / exhaust valve 16 and the guide shaft 31 like small hemispheres. The first convex portion 34 causes the cam 32 to rotate upward when the cam 32 moves rearward from the neutral position by a predetermined distance or more along the guide shaft 31. The second convex portion 35 is set at a position such that when the cam 32 has moved forward from the neutral position by a predetermined distance or more along the guide shaft 31, the cam 32 rotates upward.
[0031]
An opening / closing valve unit 50 is provided at the rear of the seat cushion 4. The on-off valve unit 50 includes an on-off valve 51 of an angle controllable type and a driving member 52. The aforementioned air pipe 23 is connected to the first port 55 of the on-off valve 51. The other end of the air pipe 23 is connected to a connection port 16 b of the supply / exhaust valve 16. The other end of the air pipe 23 a connected to the second port 56 of the on-off valve 51 is connected to a supply / exhaust port of the air spring 14. Each of the air pipes 23, 23a is covered with a bellows-shaped protection tube 58, 59, respectively.
[0032]
Inside the on-off valve 51, a valve body for communicating and shutting off the first port 55 and the second port 56 is incorporated. The valve body is driven over a valve opening mode and a valve closing mode by a valve body operation unit 65 that rotates about a shaft 64. In the valve opening mode, the air inside the air spring 14 can be discharged to the supply / exhaust valve 16. In the valve closing mode, the air of the air spring 14 is shut off so as not to be discharged.
[0033]
As shown in FIG. 4, in the on-off valve 51, the valve body operation unit 65 is in the neutral position N (the angle α with respect to the horizontal plane) ₀ ) To about 10 ° tolerance α ₁ Angle range α in the full reclining direction beyond ₂ The relationship between the valve body and the valve body operation section 65 is set so that the valve closing mode is set only when the condition is reached. The on-off valve 51 is in the valve-opening mode when the valve body operation unit 65 is tilted forward from the neutral position N.
[0034]
When the valve body operation unit 65 is at the neutral position N, the other end 52b of the driving member 52 is at the design reference position (the angle θ) of the seat back. ₀ )It is in. This reference angle θ ₀ Is about 60 ° with respect to the horizontal plane. When the seat back is tilted in the full reclining direction, the variation allowable angle θ of about 10 ° ₁ Beyond the angle θ in the full reclining direction ₂ Is reached, the angle range α in which the valve element operating unit 65 enters the valve closing mode via the drive member 52. ₂ To be displaced.
[0035]
Further, the turning radius R of the driving member 52 on the seat back side is represented by R ₁ Radius of rotation R of the valve body operation unit 65 ₂ Is increased so that no load is applied to the on-off valve 51 during forward leaning and full reclining. Reference symbol C in the figure is the center of rotation of the seat back 6.
[0036]
As shown in FIG. 3, the on-off valve 51 is fixed to a positioning bracket 70 welded to the frame 3a by a nut 71. The on-off valve 51 is stopped from rotating by a detent bracket 72.
[0037]
The valve body operation section 65 of the opening / closing valve 51 is operated by the driving member 52 in the valve opening mode and the valve closing mode. One end 52a of the driving member 52 is connected to the valve body operation section 65 by a pin 75, and is rotatable around a horizontal axis. The other end 52b of the driving member 52 is connected to a pin 76 provided on a hinge bracket 7a of the seat back frame 6a, and is rotatable around a horizontal axis. A protective cover 80 for covering the rear portion and the like of the driving member 52 is provided on the frame 3a by screws 81 and the like.
[0038]
Next, the operation of the vehicle seat 1 including the on-off valve unit 50 having the above configuration will be described.
When the seat cushion 4 moves up and down together with the upper frame 12 via the link mechanism 13 due to the running vibration of the automobile or the like, the connecting shaft 13 e of the link mechanism 13 moves back and forth with respect to the lower frame 11. The connecting member 33 of the valve switching mechanism 30 moves in the same direction in conjunction with the movement of the connecting shaft 13e, and the connecting member 33 also moves in conjunction. It reciprocates back and forth along 31.
[0039]
At this time, if the vertical movement of the seat cushion 4 is within the range of the upper and lower dead zones B and C from the set reference height Y shown in FIG. 4, the cam 32 moves in the front-rear direction from the neutral position along the guide shaft 31. Do not move more than the specified distance. For this reason, the cam 32 does not touch the first protrusion 34 or the second protrusion 35, so that the cam 32 does not rotate upward. In other words, the cam 32 remains in a horizontal state, and the distal end head portion 32b does not come into contact with the valve rods 17 and 18 of the air supply / exhaust valve 16 and escapes below the same, and the air supply / exhaust valve 16 is kept closed. ing.
[0040]
For this reason, even if the seat cushion 4 moves up and down from the set reference height Y, in the upper and lower dead zones B and C, the air supply / exhaust valve 16 is kept closed and air supply / exhaust to the air spring 14 is not performed at all. The air spring 14 buffers the vertical vibration of the seat cushion 4.
[0041]
Here, when a heavy person sits down and the seat cushion 4 descends from the set reference height Y beyond the above-mentioned lower dead zone C, the valve switching mechanism together with the connection shaft 13e of the link mechanism 13 is accompanied. The cam 32 moves rearward from the neutral position along the guide shaft 31 by a predetermined distance or more via the 30 connecting members 33. For this reason, the cam 32 rotates upward around the guide shaft 31 so that the cam 32 touches the first convex portion 34 and rides up, and the head portion 32 b of the cam 32 rises to supply the air supply valve of the air supply / exhaust valve 16. By pushing in the valve stem 17 of this and opening the air supply valve, the air supply mode is set. As a result, the compressed air from the air supply source 15 is supplied to the air spring 14, and the internal pressure of the air spring 14 increases to push up the upper frame 12 and raise the seat cushion 4.
[0042]
While the seat cushion 4 is being lifted, the cam 32 once pushes the valve rod 17, so that the cam 32 is stretched by the urging force of the spring of the valve rod 17, and regardless of the presence or absence of the first projection 34, the cam 32 moves downward. Rotation return is prevented. As a result, the cam 32 slides in contact with the valve rod 17 being pushed in, and returns forward along the guide shaft 31 in conjunction with the elevation of the seat cushion 4. In the meantime, since the air supply / exhaust valve 16 is in the air supply mode, the compressed air is continuously supplied from the air supply source 15 to the air spring 14.
[0043]
Then, when the seat cushion 4 is pushed up by the air spring 14 and rises to just before the set reference height Y, the cam 32 is interlocked via the connecting member 33 and returns to the vicinity of the neutral position. Therefore, the slanted side surface of the head portion 32b is joined to one of the valve rods 17 and 18 of the supply / exhaust valve 16, and the cam 32 is forcibly rotated and returned downward by the urging force of the valve rods 17 and 18. Simultaneously with the return of the rotation of the cam 32 downward, the valve rod 17 projects by the biasing force of the built-in spring, the air supply valve of the air supply / exhaust valve 16 closes, the supply of compressed air to the air spring 14 stops, and the seat cushion 4 Is maintained at the original set reference height Y.
[0044]
Conversely, when the seat cushion 4 rises from the set reference height Y beyond the dead zone described above, the cam 32 moves along the guide shaft 31 via the connecting member 33 and forwards from the neutral position by a predetermined distance or more. For this reason, the cam 32 rotates upward so as to get on the second convex portion 35 by touching the second convex portion 35, and pushes the valve rod 18 to open the exhaust valve of the supply / exhaust valve 16, thereby setting the exhaust mode. Thus, the compressed air in the air spring 14 is discharged, the internal pressure of the air spring 14 decreases, and the seat cushion 4 returns to the reference height together with the upper frame 12.
[0045]
Also in the exhaust mode, the cam 32 keeps rotating upward due to the biasing force of the built-in spring of the valve stem 18 regardless of the presence or absence of the second projection 35, and the cam 32 pushes the valve stem 18. As it is, that is, in the exhaust mode, it moves backward along the guide shaft 31 in conjunction with the connecting member 33, and during that time, the exhaust in the air spring 14 is continued.
[0046]
Then, when the seat cushion 4 is lowered to just before the set reference height Y, the cam 32 returns to the vicinity of the neutral position, so that the inclined side surface of the head portion 32b comes into contact with one of the valve stems 17 and 18, and the valve stem 17 , 18, the cam 32 is forcibly rotated downward and returned downward. Due to the return of the cam 32 to the downward rotation, the valve rod 18 is protruded by the biasing force of the built-in spring, the exhaust valve of the supply / exhaust valve 16 is closed, and the exhaust from the air spring 14 is stopped. Return to height Y.
[0047]
When the seat back 6 is tilted rearward during rest or the like, the load applied to the seat cushion 4 is reduced as compared with the time of normal sitting, and the seat pressure of the air spring 14 raises the seat cushion 4. In this case, as the seat back 6 is tilted rearward by a predetermined angle or more, the valve element operating section 65 of the on-off valve 51 is driven in the valve closing mode via the driving member 52, and the on-off valve 51 is closed.
[0048]
For this reason, even if the supply / exhaust valve 16 is switched to the exhaust mode by the valve switching mechanism 30 with the rise of the seat, the air is prevented from being discharged from the air spring 14. Therefore, the seat cushion 4 and the seat back 6 are held at the raised position. If the seat back 6 is raised to the normal angle, the opening / closing valve 51 is switched to the valve open mode via the driving member 52 interlocked with the seat back 6, and the air can be discharged from the air spring 14 so that the air can be discharged. The automatic height adjustment function will be exhibited.
[0049]
The present invention is not limited to the above-described embodiment. For example, specific embodiments of the supply / exhaust valve 16, the valve switching mechanism 30, and the opening / closing valve 51, and shapes of the driving member 52 and mounting positions, etc. Various changes can be made without departing from the spirit of the invention. The present invention can of course be applied to a vehicle seat device that does not include the tilt mechanism 3.
[0050]
【The invention's effect】
According to the present invention, the seat cushion can always be maintained at the set reference height irrespective of the weight of the occupant, and when the seat back is tilted backward at the time of rest or the like, even if the load on the seat cushion is reduced, the seat can be maintained. Since the seat can be prevented from lowering and the seat height can be maintained, various problems caused by the seat lowering with the seat back falling down can be avoided. For example, problems such as the bed being crushed by the seat back, the entire seat being lowered forward, and the seat being distorted are also avoided.
[0051]
Since the opening / closing valve is moved directly to the valve closing mode by the driving member in accordance with the backward tilting operation of the seat back, there is no need to route a long wire cable, and there is no possibility of malfunction. Further, it is also easy to adjust the position of the valve operating portion of the on-off valve in relation to the inclination angle of the seat back.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a vehicle seat showing one embodiment of the present invention.
FIG. 2 is an overall perspective view of the vehicle seat shown in FIG. 1;
FIG. 3 is an exploded perspective view of a part of a frame of the vehicle seat shown in FIG. 1 and an opening / closing valve mechanism.
FIG. 4 is a side view of a part of the vehicle seat shown in FIG. 1;
FIG. 5 is a perspective view of a part of a vehicle seat showing the prior art.
FIG. 6 is a conceptual diagram showing a relationship between a seat provided with an air suspension device and peripheral members.
[Explanation of symbols]
1. Vehicle seat 2. Air suspension device
4 ... Seat cushion 6 ... Seat back
11 Lower frame 12 Upper frame
13 Link mechanism 14 Air spring
15: Supply air source 16: Supply / exhaust valve
30: Valve switching mechanism 50: On-off valve unit
51 ... open / close valve 52 ... drive member
65… Valve operating part

Claims (2)

A lower frame provided on the floor side of the vehicle,
An upper frame disposed above the lower frame and supporting a seat cushion;
A seat back provided at the rear of the seat cushion and capable of changing the inclination angle in the front-back direction,
A link mechanism for supporting the upper frame so as to be vertically movable with respect to the lower frame,
An air spring that supports a load applied to the upper frame from above,
An air supply source for supplying compressed air to the air spring;
An air supply mode provided between the air supply source and the air spring to supply compressed air sent from the air supply source to the air spring when the upper frame has a predetermined height or less. And an air supply / exhaust valve which is in an exhaust mode for discharging air from the air spring when the upper frame has a predetermined height or more,
A valve switching mechanism that operates the supply / exhaust valve to the supply mode or the exhaust mode according to the height of the upper frame,
An opening / closing valve provided between the air spring and the supply / exhaust valve and attached to a rear portion of a seat cushion, wherein the valve in an open mode capable of discharging air in the air spring to the supply / exhaust valve side; An on-off valve having a valve element operating portion operable in a valve-closing mode in which air in the air spring is shut off so that the air cannot be discharged;
One end is connected to the member on the side of the seat back and the other end is connected to the valve body operating portion of the on-off valve, and the valve body operating portion is closed only when the seat back is tilted backward by a predetermined angle or more. A driving member for moving the valve body to the valve mode, wherein the load applied to the seat cushion by tilting the seat back backward is reduced as compared with a normal seat and the seat cushion is raised by the internal pressure of the air spring; A drive member that closes the on-off valve by driving the valve in the direction of the valve-closing mode ,
A vehicle seat provided with an air suspension device, comprising: The on-off valve is an angle-controllable valve having a swingable valve element operating section, one end of the driving member is connected to the valve element operating section of the on-off valve, and the other end of the driving member is the seat. The vehicle seat provided with the air suspension device according to claim 1, wherein the vehicle seat is connected to a member on the back side so as to be rotatable around a horizontal axis.

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