JPS6318365Y2 - - Google Patents

Description

[Detailed description of the invention] This invention raises and lowers the seat and tilts the backrest of a chair for hairdressing, dentistry, etc. by switching the forward and reverse directions of a single hydraulic pump, and also simplifies the hydraulic circuit. It is related to a device that can be used for various purposes.

The present invention will be described below based on embodiments shown in the drawings.

In the figure, 1 is a cylinder installed vertically in the legs and other parts of the main body of a hairdressing chair, medical/dental chair, etc. A ram 2 having a piston 3 at the bottom is fitted into the cylinder 1 so as to be able to move up and down. At the same time, the inside of the cylinder 1 is connected to an upper chamber R1 and a lower chamber by a piston ₃ formed integrally with the lower part of the ram 2.
_R3 , and each chamber _R1 , _R3 is independently connected to the oil supply pipes 10, 14 from the hydraulic pump 4, so that the ram 2 can be raised or lowered as well as for oil supply or drainage. Cylinder 8 for tilting the backrest
It is used to operate. The above-mentioned hydraulic pump 4 can be rotated in forward and reverse directions, and performs an oil feeding action even when rotated in either direction.
The oil is supplied by the pump ₄ through the oil supply pipe 9 equipped with a check valve V 1 and guided to the lower chamber R _{3 of the cylinder 1 through the oil supply pipe 14 equipped with a check valve V 3 at} the required pressure. to raise the seat. Further, an oil drain pipe 15 equipped with a solenoid valve 6 is connected to the oil supply pipe 14 from a position past the check valve V ₃ so as to lead into the tank. In addition, hydraulic pump 4
At the time of reverse rotation, oil is supplied from an oil supply pipe 13 equipped with a check valve V ₂ and led to the upper chamber R ₁ of the cylinder through an oil supply pipe 10, and a part of this oil supply pipe 10 is equipped with a solenoid valve 5. An oil drain pipe 11 leading to the tank T is connected, and the tip of the oil feed pipe 10 is provided with a check valve V ₄ provided in the cylinder and a bypass passage 10a, and a solenoid valve 7 is provided from the chamber R ₂ in the ram 2. Oil pipe 1
2 to the cylinder 8. 0 is an orifice drilled in the piston section at the lower part of the ram 2, which connects the upper chamber _R1 of the cylinder and the chamber _R2 in the ram.

Therefore, when the button for raising the seat part is pressed, the hydraulic pump 4 is rotated in the normal direction, and the hydraulic oil is supplied to the oil supply pipe 9 and the check valve.
V ₃ is opened and oil is supplied to the cylinder lower chamber R ₃ via the oil feed pipe 14, and the ram rises. At this time, the solenoid valve 6 is closed and the solenoid valve 5 is open. As the ram 2 rises, the oil in the upper chamber _R1 flows through the oil pipes 10 and 1.
1 and return to tank T.

When the seat lift button (switch) is released, the pump is stopped, and the oil in the lower cylinder chamber _R3 becomes sealed, and the ram, which had been rising due to oil supply up until now, is stopped and the pump is stopped. , the seat is locked and stops at that position. When attempting to lower the seat, the hydraulic pump is turned off by operating the seat lowering button (switch).
The solenoid valve 6 remains open, the oil drain pipe 15 opens, and the hydraulic oil in the cylinder lower chamber _R3 , which is pressurized by the seat load, flows through the oil drain pipe 15 to the tank T.
The seat (ram) descends as the oil drains.
When the pressure in the upper chamber _R1 becomes negative, oil is replenished through the oil feed pipes 9 and 10 by siphon action. To raise the backrest, the hydraulic pump 4 is reversed to open the check valve _V2 from the oil supply pipe 13, and the oil is guided from the bypass passage 10a to the cylinder upper chamber R1 via the oil supply pipe ₁₀ . The hydraulic oil in this upper chamber is led to the ram chamber R2 from the orifice 0, and is supplied to the cylinder ₈ through the oil supply pipe 12 provided at the upper end of the ram, and the cylinder 8 is moved to raise the backrest. At this time, the electromagnetic valves 5 and 6 are closed, and the electromagnetic valve 7 is open. When the hydraulic pump is stopped, the backrest is locked and stopped at a predetermined position. Next, to tilt the backrest,
When the solenoid valves 5 and 7 are opened (the solenoid valve 6 is closed), the hydraulic oil in the cylinder 8 flows in the opposite direction to that during refueling by the action of the spring S, and is returned to the tank via the oil drain pipe 11. The backrest is reclining.

According to the present invention, the chair seat can be raised and lowered and the backrest tilted selectively by switching between forward and reverse rotation of a single hydraulic pump, and the piston of the ram fitted into the cylinder can be used to raise and lower the chair seat. The lower chamber is used for raising the ram, that is, the seat, and the upper chamber is used for tilting the backrest.A chamber is formed in the ram as a feeding path, and the upper part of the ram is used for tilting the seat and backrest. Since the cylinder is provided, the backrest can be tilted smoothly regardless of the position of the seat, and its piping is also simple, which has the advantage of being less likely to break down, easy to maintain, and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a hydraulic circuit diagram, and FIG. 2 is a sectional view. 1... Cylinder, 2... Ram, 3... Piston, 4... Hydraulic pump, 5, 6... Solenoid valve, 8...
... Cylinder, 9, 13 ... Oil supply pipe, 10, 14,
12... Oil feed pipe, 11, 15... Oil drain pipe, V ₁ ,
V ₂ , V ₃ , V ₄ ... Check valve, R ₁ ... Upper chamber, R ₂ ...
Chamber, R ₃ ...lower chamber, T...tank.

Claims (1)

[Scope of utility model registration request] The inside of the cylinder that raises and lowers the ram equipped with a chair seat is divided into an upper chamber and a lower chamber by a piston integrally provided at the bottom of the ram, and the ram is inserted into the cylinder, and both chambers of this cylinder are separated. The ram is connected to a hydraulic pump that can be rotated in forward and reverse directions through oil pipes each equipped with a solenoid valve, and the ram is provided with a hollow chamber inside the ram for guiding hydraulic oil to the cylinder for tilting the backrest. An oil pipe is connected to the chamber, and this oil pipe is equipped with a solenoid valve, and oil is supplied to the chamber of the ram from the upper chamber of the cylinder through an orifice drilled on the outer circumference of the ram to connect the ram chamber and the upper chamber of the cylinder. A device for raising and lowering a seat and tilting a backrest of a hairdressing chair arranged in series in an oil passage.