JPH0719882Y2 - Air suspension seat with reclining - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an air suspension seat with reclining in a vehicle or the like, and is particularly installed in a place where a backrest for reclining abuts a fixed object and does not fall over a certain angle. The air suspension seat with reclining.

[Prior Art] A general structure and operation of a conventional air suspension seat with reclining will be described with reference to Figs. 7 to 9.

The seat 3 includes a cushion seat 4 and a back support 6 that reclines around the support pins 5. As will be described in detail later, the cushion seat 4 is elastically supported on the floor surface of the vehicle by an air spring 7, an air suspension cross link 8 (FIGS. 1, 2, and 10) and the like. The air circuit between the air spring 7 and the compressed air source 9 includes an auto leveler 10, a pipe 11 installed between the auto leveler 10 and the compressed air source 9, and between the auto leveler 10 and the air spring 7. Piping 12 installed in the auto leveler 10
And an exhaust pipe 13 and the like connected to.

The auto-levelizer 10 is composed of an air valve 18 having push rods 14 and 15 and switching valves 16 and 17 that are operated by reciprocating movements thereof, a swing member 19 that operates the push rods 14 and 15, and the like. The swinging member 19 rotates around the support pin 20, and the extending rod 21 is connected to the air suspension cross link 8 via a bush 22.

FIG. 7 shows a normal state in which compressed air of appropriate pressure is introduced into the air spring 7. The swing member 19 maintains a neutral state in which it does not contact the push rods 14 and 15, and the switching valve 16 and
17 is held closed.

FIG. 8 shows a state in which a force in the direction of arrow A is applied to the seat 3 in the normal state shown in FIG. In this case, since the air suspension cross link 8 moves in the direction of arrow B, the swing member 19 presses the push rod 15 of the air valve 18, and the switching valve 17
Open up. Therefore, the air from the compressed air source 9 is supplied to the pipe 11
To the pipe 12 side, and air is introduced into the air spring 7. As a result, the sheet 3 is pushed from below and the normal state shown in FIG. 7 is restored.

Contrary to FIG. 8, FIG. 9 shows a state in which a force in the direction of arrow C acts on the seat 3 (corresponding to a state in which the waist is lifted from the seat 3). In this case, the air suspension cross link 8 moves in the direction of arrow D, the swing member 19 presses the push rod 14, and the switching valve 16 opens. The switching valve 17 is kept closed. Therefore, the air in the air cylinder 7 flows back to the air valve 18 side through the pipe 12, and the exhaust pipe
Emitted from 13. As a result, the normal state shown in FIG. 7 is restored.

[Problems to be Solved by the Invention] As described above, the air suspension seat is formed so as to automatically respond to changes in the force applied to the seat 3 and always provide optimum cushioning properties.

When the air suspension seat having the above-mentioned structure is installed at the location of the cab structure having the protruding step portion 24 surrounding the air cleaner 23 and the like as shown in FIG. 10, the backrest 6 protrudes as shown in the drawing at the time of reclining. There is a problem in that the step 24 is hit and it is impossible to recline by a certain angle or more. However, this problem cannot be solved by the air suspension seat having the structure described above.

One of means for solving such a problem is to adjust the seat height when necessary. A conventional technique for adjusting the seat height is disclosed in Japanese Utility Model Laid-Open No. 58-50022.

The technology disclosed in Japanese Utility Model Laid-Open No. 58-50022 changes the seat height by operating a controller that controls opening and closing of an intake valve and an exhaust valve engaged with the seat even when the ignition switch of the engine is turned off. In particular, the feature is that the seat height is adjusted to a low level when the ignition switch is turned off so that the passenger can easily get in and out of the seat.

As will be described later in detail, the technology disclosed in Japanese Utility Model Laid-Open No. 58-50022 and the present invention are common in that compressed air is introduced into and discharged from the seat side when necessary, but its circuit configuration and purpose, The effects are completely different, and the above problems cannot be solved by this conventional technique.

The present invention solves the above-mentioned problems, and always functions as an air suspension seat, and when reclining, if the backrest tilts only at a certain angle or more, the seat can be automatically lifted and fully reclined. It is an object of the present invention to provide an air suspension seat with reclining which is adjusted as described above and can automatically operate as the original air suspension seat when the backrest is restored.

[Means for Solving the Problems] In order to achieve the above object, the present invention is an air suspension seat elastically supported by an air spring connected to a compressed air source through an air circuit. A detection switch is provided at the rear part of the backrest of the seat, and when the detection switch is turned on, the compressed air source and the air spring are communicated to raise the airspring to a position where the backrest does not contact the detection switch. The air suspension seat with reclining, which is provided with the magnet valve to be installed in the air circuit, is configured.

[Operation] In a normal state where the seat is not reclined, the air spring that elastically supports the seat cushions by the operation of the auto-leveler provided in the air circuit. When reclining and the backrest falls by a certain angle or more, the detection switch operates to operate the magnet valve installed in the air circuit to directly connect the compressed air source and the air spring. As a result, the air spring expands, raises the seat to a predetermined height, and adjusts the height to a position where the backrest can be fully reclined. When the backrest reclining is restored, it returns to the normal state and functions as an air suspension seat.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

First, the overall structure will be described with reference to FIGS. 1 and 2.

Below the cushion seat 4 of the seat 3, there is a link member 2
An air suspension cross link 8 in which 5,26 are combined in an X shape around a pin 27 is provided. Both ends of the link members 25, 26 are pin-supported by the upper frame 32 and the lower frame 33 by support pins 28, 29, 30, 31.

The air spring 7 is made of a sealed rubber body and has an upper frame 32.
Is interposed between the lower frame 33 and the lower frame 33 to elastically support the seat 3. The lower frame 33 is supported on the floor surface 35 via the seat slide base 34.

The backrest 6 is moved around the support pin 5 by a reclining lever 37 by a direct reclining member 36 fixedly attached to the cushion seat 4 side. Further, the back support 6 is provided with a reinforcing plate 38.

Next, the circuit structure provided between the air spring 7 and the compressed air source 9 will be described.

The compressed air source 9 is connected via a pipe 11 to the auto leveler 10 described with reference to FIG. Auto levelizer
A magnet valve 1 is provided in a pipe 12 connecting the air spring 7 and the air spring 7. Therefore, the pipe 12 is the pipe 12a,
It is separated into 12b. A pipe 11 a branched from the pipe 11 is connected to the magnet valve 1.

On the other hand, the detection switch 2 is fixed to the fixed side of the cab, and the mounting position of the detection switch 2 is before the backrest 6 reclines and comes into contact with the protruding step portion 24 shown in FIG.
It is installed in the place operated by. The terminals a and b of the detection switch 2 are connected to the terminals a and b of the magnet valve 1 to control the opening and closing of the magnet valve 1.

Next, the operation of this embodiment will be described in more detail with reference to FIGS. 3 and 4.

When the seat 3 is not in the reclining state or when the reinforcing plate 38 of the backrest 6 is not in contact with the detection switch 2, the seat 3 functions as an air suspension seat in the state shown in FIG. As shown in FIG. 3, when the backrest 6 reclines and the reinforcing plate 38 comes into contact with the detection switch 2 and the switch is turned on, the switching valve 39 (FIG. 4) of the magnet valve 1 is opened and the pipe 11, Although 11a and 12b communicate with each other, the switching valve 40 is closed and the pipe 12a between the air valve 18 and the magnet valve 1 is closed. The switching valve 17 in the air valve 18 is also closed. Therefore, the air from the compressed air source 9 is directly introduced into the air spring 7, and the air spring 7 extends as shown in the drawing to raise the seat 3. Along with that, the swinging member 19 rotates as shown in the figure and pushes the push rod 14 to move the switching valve in the air valve 18.
Although 16 (Fig. 7) is opened, no air flow to the exhaust pipe 13 side occurs because the switching valves 17 and 40 are closed.
FIG. 5 is a schematic view showing a state where the seat 3 is raised,
The backrest 6 does not interfere with the protruding step portion 24 and can be fully reclining. Although not shown in the drawing, even when the seat 3 is lifted and the detection switch 2 and the reinforcing plate 38 of the backrest 6 are disengaged from each other, while the backrest 6 is reclining, as shown in FIG. It is held in the state shown in.

FIG. 4 shows a case where the reclining of the back support 6 of the seat 3 which has been raised to the position shown in FIG. 3 is restored. In this case, the switching valve 39 of the magnet valve 1 that connects the piping 11a and the piping 12b is closed, and the switching valve 40 (FIG. 3) that connects the piping 12a and the piping 12b is opened. The switching valve 17 in the air valve 18 is closed and the switching valve 16 (FIG. 7) is open. With the above configuration, the introduction of air from the compressed air source 9 is stopped, and conversely, the air in the air spring 7 passes through the pipes 12b and 12a and is discharged from the exhaust pipe 13 of the air valve 18. Therefore, the stretched air spring 7 returns to the original state, the state shown in FIG. 4 is changed to the state shown in FIG. 7, and the seat 3 functions as a normal air suspension seat.

FIG. 6 shows another embodiment of the present invention.

As described above, the seat height of the air spring 7 into which the air from the compressed air source 9 is introduced and expands depends on the amount of compressed air introduced and the pressure thereof, and in the above-described embodiment, an air supply control mechanism (not shown) is used. However, the present embodiment is characterized in that the limit switch 41 is arranged and the height of the air spring 7 is controlled.

The limit switch 41 is fixed at a position corresponding to the seat height to be controlled. On the other hand, a dog 42 that engages with the limit switch 41 is arranged on the seat 3 side. Further, a normal on valve 42 (which is turned off when energized) is provided in the pipe 11 communicating with the compressed air source 9. The normally-on valve 42 and the terminals (d, e) of the limit switch 41 are electrically connected. As described with reference to FIG. 3, when the detection switch 2 is turned on, the air spring 7 is extended, and the dog 42 comes into contact with the limit switch 41, the normally-on valve 42 is turned off, and the air from the compressed air source 9 is released. Supply stops. As a result, the air spring 7 is held at a constant seat height position.

By adjusting the limit switch 41, the stop position of the seat 3 can be reliably controlled.

[Effect of the Invention] According to the present invention, the following remarkable effects are obtained.

1) When the backrest comes into contact with a protruding step of the cab and cannot recline by a certain angle or more, the seat automatically rises, and the seat easily moves to a position where the backrest can fully recline.

2) To return to the normal state of the air suspension seat, it is enough to raise the backrest, which is easy.

3) It suffices to provide a magnet valve that operates with a detection switch in the existing air circuit, and it can be implemented easily and inexpensively for a completed vehicle.

4) It is possible to accurately hold the air suspension seat at a desired seat height position by using the limit switch and the normal-on valve operated by the limit switch.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is a partial perspective view showing a main part of an air suspension seat, and FIG.
FIG. 4 is a pneumatic circuit diagram for explaining the operation and operation of the embodiment, FIG. 5 is a side view showing the seat raised state and full reclining state of the embodiment, and FIG. 6 is another embodiment of the present invention. FIG. 7 to FIG. 9 are configuration diagrams of the embodiment and an air circuit diagram thereof, FIG. 7 to FIG. 9 are air circuit diagrams for explaining the action and operation of a conventional air suspension seat, and FIG. 10 is a problem of a conventional air suspension seat with reclining. It is a side view for explaining a point. 1 ... Magnet valve, 2 ... Detection switch, 3 ...
Seat, 4 …… Cushion seat, 5,20 …… Support pin,
6 ... Backrest, 7 ... Air spring, 8 ... Air suspension cross link, 9 ... Compressed air source, 10 ... Auto leveler, 11,11a, 12,12a, 12b ... Piping, 13 ... Exhaust pipe ,14,
15 …… Push rod, 16,17,39,40 …… Switching valve, 1
8 …… Air valve, 19 …… Swing member, 21 …… Rod, 22
...... Bush, 24 ...... Projection step, 38 ...... Reinforcement plate, 41 ......
Limit switch, 42 ... Normally on valve.

Claims (1)

[Scope of utility model registration request] 1. An air suspension seat elastically supported by an air spring connected to a compressed air source via an air circuit, wherein a detection switch is provided at a rear portion of a back support of the air suspension seat, A magnetic valve is provided in the air circuit to connect the compressed air source and the air spring to each other when the switch is turned on and raise the air spring to a position where the backrest does not contact the detection switch. Air suspension seat.