JPH085633Y2 - Shock absorber when starting a chair - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing device at the time of starting in a relatively small capacity hydraulically operated device such as a hydraulically operated beauty / beauty chair, an operating table (hereinafter referred to as a chair).

[0002]

2. Description of the Related Art In conventional hydraulically actuated chairs, it is general that no measures are taken against a shock at the beginning of actuation. In addition, as a method of quietly operating the chair using existing technology, a method of installing an accumulator in a hydraulic line leading to the lifting cylinder is used partially, but the operator is not able to operate on the person sitting on the chair. When doing so, the load on the chair fluctuates and the chair moves, so the current situation is to use a complicated shaking prevention device together.

[0003]

A motor pump used for raising and lowering a chair or the like generally has a small capacity (output 100 W).
(Below) Due to its small size, the time constant at startup was fairly small, and when energized, it immediately started to rise at a constant speed and was accompanied by a large shock.

When the chair is lowered, the motor pump is not driven, but if the solenoid valve on the descending side is opened, the pressure oil stored in the hydraulic cylinder for raising and lowering is suddenly vented, so the chair descends rapidly. After that, there was a big shock, and there was a demand for the development of a quiet chair. The present invention seeks to provide a hydraulic system that is shock-free at the start of lifting.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a shock absorbing device at the time of starting a chair or the like for achieving the above-mentioned object, and relates to a shock absorbing device between a motor pump 5 and a hydraulic cylinder 6, a return solenoid valve 7 and an oil tank 10. Slow open valves 4, 4 gradually opened in each of the pipelines by the pressure applied to the pipelines.
The structure of the slow open valves 4 and 4a is such that the control valve 2 slidably provided in the valve casing 1 when the pressure oil is not applied to the slow open valves 4 and 4a is the spring 3 It is pushed to one side by the urging force of 1 to close the outflow passage 1d of the valve box 1.

On the other hand, the main body of the control valve 2 penetrates the main body of the control valve 2 from a position leading to the inlet of the valve box 1, and an end face 2a and a pressure introducing hole 2c opened in a section 1a between the end face 2a and the valve box 1.
And a pore 2d penetrating the main body of the control valve 2 from the other end surface 2b to the vent hole 1e of the valve box 1, and the spring 3 is provided in the section 1b between the end surface 2b and the valve box 1. is there.

[0007]

[Operation] Even if the motor pump 5 is started and pressure oil is instantaneously discharged, the pressure oil is not immediately supplied to the lift cylinder 6 because the slow open valve 4 serving as a gate is closed. First, the same pressure is applied to the slow open valve 4 section 1a.
Is tried to push the control valve 2 to the compartment 1b side against the spring 3 but the oil discharge hole stored in the compartment 1b is only the small hole 2d provided in the control valve 2 main body. Pore 2
The control valve 2 operates slowly due to the resistance of the portion d, and the flow passage between the inflow port 1c and the outflow port 1d is gradually opened, so that the hydraulic cylinder 6 starts to slowly rise.

Similarly, when the chair is lowered, if the return side solenoid valve 7 is opened, the slow side slow open valve 4a provided on the downstream side of the solenoid valve 7 is also gradually opened, so that the chair is gradually opened. Begin the descent. Thus, the shock at the time of lifting and lowering, which has been a problem so far, is reduced, and a quiet chair can be realized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a slow open valve according to the present invention, and FIG. 2 shows an embodiment in which the slow open valve is incorporated into a hydraulic lifting device for a chair. However, although the chair body is connected to the hydraulic cylinder, it is omitted.

According to FIG. 1, 4 is a slow open valve and 1
Is a valve box, 2 is a control valve, and 3 is a spring. Pressure oil is discharged from the inflow port 1c of the valve box 1 through the outflow port 1d, but when the pressure at the inflow port 1c is low, the control valve 2 is partitioned by the force of the spring 3.
Move it to the side a, and let the outlet 1d at the central land of the control valve 2.
Is closed. 1e is a vent hole.

When the motor pump 5 is started and the pressure oil is supplied to the inflow port 1c, the pressure oil is supplied from the end face 2a to the section 1a through the pressure introduction hole 2c provided in the control valve 2 to control the control 2. I tried to move it to the section 1b side suddenly,
For that purpose, it is necessary to discharge the oil in the compartment 1b, and since the oil discharged at this time is narrowed by the pores 2d provided in the control valve 2, the control valve 2 moves gently and the outlet port 1d is gradually opened. When the pressure at the inflow port 1C decreases, the spring 3 tries to push the control valve 2 back to the compartment 1a side, but the check valve 2f is automatically opened and the bypass hole 2 is opened.
From e, the oil easily returns to the section 1b side, so the control valve 2
Will return promptly.

FIG. 2 is a circuit diagram of a hydraulic lifting apparatus for a chair equipped with the slow open valve 4. 6 is a hydraulic cylinder, and 7 is an electromagnetic valve. When the motor pump 5 is driven, the motor pump 5 instantly discharges the rated oil amount, but the slow open valve 4 is gradually opened, so that the hydraulic cylinder 6 is gradually pressurized. Oil is supplied and the rise is moderately triggered, and no shock occurs. Similarly, when lowering the chair, the solenoid valve 7
Since the slow open valve 4a is gradually opened even when is opened, the chair gradually descends, and when the slow open valve 4a is fully opened, the chair descends at a constant speed. In this way, the shock of the hydraulic lift chair adopting the slow open valves 4 and 4a can be alleviated at the time of starting up and down.

Although the above embodiments have been described with respect to the chair hydraulic lifting device, the present invention can be applied to a chair reclining device and an operating device of various units other than an operating table.

[0014]

[Effects of the Invention] The present invention, as described above, includes a motor pump 5
Even if the pressure oil is instantly discharged and the pressure oil is instantaneously discharged, the pressure oil is not immediately supplied to the lifting cylinder 6 by the slow open valve 4, but is once introduced into the compartment in the slow open valve 4, and the control valve 2 operates slowly. The hydraulic cylinder 6 by gradually increasing the supply to the hydraulic cylinder.
Starts to rise slowly, alleviates the shock when the chair is raised, and can sit comfortably without causing any pain to the seated person.

The same is true when lowering the chair. Since the slow-side slow open valve 4a is gradually opened, the chair starts to descend gradually. It is possible to realize a chair that is reduced and does not give a shock to a seated person.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a slow open valve according to the present invention.

FIG. 2 is a hydraulic circuit diagram in which a slow open valve is incorporated in a hydraulic device.

[Explanation of symbols]

 1 Valve box 1a, 1b Sectional face 1c Inlet 1d Outlet 1e Vent hole 2 Control valve 2a, 2b End face 2c Pressure introduction hole 2d Pore 3 Spring 4, 4a Slow open valve 5 Motor pump 6 Hydraulic cylinder 7 Solenoid valve 8 Check Valve 9 Relief valve 10 Oil tank

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F15B 11/00 7344-4C A61G 15/00 C

Claims (2)

[Scope of utility model registration request] 1. A hydraulic system for operating a chair or the like,
A valve box 1 and a control valve 2 slidably provided in the valve box 1,
The end face 2a penetrating the control valve 2 body and the compartment 1a in the valve box 1
Is provided with a pressure introducing hole 2c and a pore 2d communicating from the other end surface 2b to the vent hole 1e in the valve box 1, and the spring 3 is arranged in the end surface 2b and the compartment 1b in the valve box 1. A shock absorbing device at the time of starting a chair or the like, characterized in that it is arranged to be pushed to one side by the reaction force of the spring 3 to close the outlet 1d of the valve box 1. 2. A pipe line between the motor pump 5 and the hydraulic cylinder 6 and between the return side solenoid valve 7 and the oil tank 10,
The shock absorbing device at the time of starting of a chair or the like according to claim 1, wherein the flow passage is opened by the pressure applied to the pipe.