JPH0817729B2 - Seat equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a seat device, and more particularly to an air suspension type seat device used in a vehicle or the like.

[Prior Art] In a conventional seat used in a vehicle or the like, as shown in FIG. 3, a floor a and a seat b arranged above the floor a.
And an air spring d, which is formed by enclosing compressed air in a single bellows c, and the seat b is flexibly supported on the floor a from below by the air spring d. It has been known. Incidentally, e is a pantograph mechanism having a general structure for guiding the seat b to move vertically.

[Problems to be Solved by the Invention] By the way, in the past, since the seat b was supported only from below by the air spring d configured by enclosing compressed air in a single bellows c, encapsulation was performed. Seat b with a considerable spring constant according to the pressure of compressed air and the amount of air
Can be elastically supported, but a seat height automatic adjustment mechanism for keeping the height position of the seat b on the floor a constant, and a spring constant for changing the spring constant of the air spring d according to the road surface condition and the like. The adjusting mechanism had to be installed separately.

Here, the seat height automatic adjusting mechanism maintains the seat b at a constant height position by adjusting the pressure of the compressed air that the amount of depression of the air spring d changes due to the weight of the seated person. However, there is a problem that the spring constant becomes unnecessarily large when the pressure is increased so that the seat b has a constant height, especially for a heavy weight person. Further, the spring constant adjusting mechanism can be configured by making the capacity of the bellows c variable, but the control had to be performed separately because of the relationship with the seat height automatic adjusting mechanism.

Further, regarding the support of the seat b, the air spring d effectively functions when the seat b sinks downward, but when the seat b floats upward, the air spring d is regulated by a stopper rubber or the like. However, the sufficient effect of the air spring d could not be expected.

[Means for Solving the Problems] According to the present invention, a first air spring elastically supporting a seat from below, a second air spring elastically supporting the seat from above, and a height position of the seat are adjusted. It comprises height adjusting means for detecting the seat height and supplying / discharging compressed air to / from these air springs, and spring constant adjusting means for adjusting the air pressure to adjust the spring constant of these air springs.

[Operation] To describe the operation of the present invention, the first air spring and the second air spring
While elastically supporting the seat from above and below with the air spring, the height adjusting means detects the seat height to supply and discharge compressed air to and from the air spring to adjust the seat height position, and the spring constant adjusting means. The air pressure is adjusted to adjust the spring constant of the air spring.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, a lower bracket 2 is provided on the upper surface of the floor 1, and an upper bracket 4 is provided on the lower surface of the seat 3. The brackets 2 and 4 are formed in a channel shape, and a pantograph mechanism 5 having a general structure for guiding the vertical movement of the seat 3 in the vertical direction is provided between the brackets 2 and 4. In this pantograph mechanism 5, one end is pin-supported by the brackets 2 and 4, a roller 6 running on the channel part of the brackets 2 and 4 is attached to the other end, and the center parts are pin-coupled to each other so that the brackets 2 and 4 are connected to each other. It is composed of a pair of link members 7 which are extended in an X shape.

The L-shaped support arms 8 and 9 are provided on the upper bracket and the lower bracket 2 of the seat 3 and the floor 1 thus configured so as to hang down and stand up from them. In particular, the support arms 8 and 9 are arranged between the floor 1 and the seat 3 such that horizontal plane portions 8a and 9a parallel to them are vertically opposed to each other. A first air spring 10 elastically supports the seat 3 from below between the floor 1 and the upper surface of the support arm 9 provided on the lower bracket 2 on the floor side and the lower surface of the upper bracket 4 of the seat 3. And a second air spring that elastically supports the seat 3 from above between the support arms 8 and 9.
11 are provided. These air springs 10 and 11 are composed of bellows 12 and 13 to and from which compressed air is supplied and discharged.

Further, the support arm 9 attached to the lower bracket 2 on the floor side is provided with a height position detecting means 15 constituting a height adjusting means 14 described later. The height position detecting means 15 is an upper switch for detecting the upper limit position of the seat 3.
It is composed of SW1 and a lower switch SW2 for detecting the lower limit position, and detects the tip end position of the support arm 8 attached to the upper bracket 4 which is displaced as the seat 3 moves up and down. Further, on the side portion of the seat 3, an operation lever of a pressure control valve which constitutes a spring constant adjusting means 16 described later is provided.
17 and a lever 18 for operating the pressure distribution valve are provided.

Next, a circuit for supplying / discharging compressed air to / from the air springs 10 and 11 will be described with reference to FIG. The air tank 19 includes a bellows 12 which constitutes air springs 10 and 11 via an air pipe 20,
13 are connected. In the middle of the air pipe 20, the seat height is detected to adjust the height position of the seat 3, and an air spring is detected.
Height adjusting means 14 for supplying / discharging compressed air is provided at 10, 11. The height adjusting means 14 includes a first electromagnetic valve SOL1 that communicates compressed air from an air tank 19 with a port communicating when the seat height is low, and an exhaust pipe 21 that is branched from the downstream side of the first electromagnetic valve SOL1. The second port, which is installed in the vehicle and communicates with the port when the seat height is high to exhaust compressed air from the air springs 10 and 11.
The solenoid valve SOL2 and the above-mentioned height position detecting means 15 that operates them are configured. Further, in the middle of the air pipe 20, between the height adjusting means 14 and the bellows 12, 13, spring constant adjusting means 16 for adjusting the air pressure so as to adjust the spring constant of the air springs 10, 11 is provided. . This spring constant adjusting means 16
Is provided on the upstream side of the branch pipes 20a, 20b to the pair of bellows 12, 13 and restricts the introduction pressure to adjust the introduction pressure to the air springs 10 and 11 so that the springs of the entire spring system. The pressure control valve 22 for controlling the constant and either one of the branch pipes 20a and 20b (in the illustrated example, the first air spring 10 side) or both of them are interposed, and the first air spring 10 and the second air spring 11 are mutually connected. Pressure distribution for variably controlling the mutual spring constant by controlling the pressure between them (in the illustrated example, the pressure of the second air spring 11 is raised to increase the spring constant by opening). And a valve 23. These valves 22 and 23 are manually controlled by the above-mentioned operation levers 17 and 18.

Incidentally, 24 is a battery for operating the solenoid valves SOL1, SOL2.

 Next, the operation of the embodiment will be described.

When a person sits in the seat 3, the height position detecting means 15 of the height adjusting means 14 detects the height position of the seat 3 and the upper switch
By closing SW1 or the lower switch SW2, the first solenoid valve SO
Operate L1 or second solenoid valve SOL2. When the seat 3 is low, the lower switch SW2 is closed, the first solenoid valve SOL1 is energized, compressed air is supplied from the air tank 19 to the bellows 12 and 13, and the seat 3 rises. On the other hand, when the seat 3 is high, the upper switch SW1 is closed and the second solenoid valve SOL
2 is energized and air is discharged from the bellows 12, 13 via the exhaust pipe 21, and the seat 3 descends. Further, at this time, by controlling the pressure control valve 22 and the pressure distribution valve 23 of the spring constant adjusting means 16 by the respective operation levers 17 and 18, the spring constant of the entire spring system and the first air spring 10 and the second air spring. The 11 mutual spring constants can be adjusted to each other.
For example, if the pressure control valve 22 and the pressure distribution valve 23 are squeezed, compressed air is introduced into the bellows 12 and 13 at the minimum pressure that supports the weight of the personnel, and the air springs 10 and 11 have conventional spring constants. Becomes On the other hand, when the pressure control valve 22 is opened,
Compressed air is introduced into the bellows 12, 13 at a high pressure, and the spring constants of the air springs 10, 11 both increase, so that the spring constant of the spring system becomes large. Further, when the pressure distribution valve 23 is opened, the pressure of the bellows 13 of the second air spring 11 is increased,
The spring constant of the second air spring 11 can be independently increased. Even during the operation of the spring constant adjusting means 16, the height adjusting means 14 is operated, and the height of the seat 3 can be kept constant while ensuring a desired spring constant. it can.

Further, since the seat 3 is elastically supported not only from below but also from above by the second air spring 11, the lifting of the seat 3 can be appropriately buffered and supported.

 Incidentally, 25 in FIG. 2 is an orifice.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

The seat is elastically supported from above and below a pair of air springs, and the supply and discharge of compressed air to and from the air springs and the introduction pressure are controlled by height adjusting means and spring constant adjusting means. The height of the seat and the spring constant can be adjusted according to the user's preference or according to the preference of the personnel, and the sinking and the rising of the seat can be appropriately buffered and absorbed.

[Brief description of drawings]

FIG. 1 is a side view showing a preferred embodiment of the present invention, FIG. 2 is a circuit diagram showing an air supply circuit, and FIG. 3 is a schematic side view showing a conventional example. In the figure, 3 is a seat, 10 is a first air spring, 11 is a second air spring, 14 is height adjusting means, and 16 is spring constant adjusting means.

Claims (1)

[Claims] 1. A first air spring for elastically supporting the seat from below, a second air spring for elastically supporting the seat from above, and a seat height for detecting the seat height for adjusting the seat height. A seat device including height adjusting means for supplying / discharging compressed air to / from a spring, and spring constant adjusting means for adjusting air pressure to adjust the spring constant of these air springs.