Hydraulically-actuated control device for operation unit in trea

Details Hydraulically-actuated control device for operation unit in trea Hydraulically-actuated control device for operation unit in trea

1981-02-18

1983-09-27

Weakley, Harold W.

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

60484, 60476, 60494, 60911, B60T 1320

Patent

active

044061234

ABSTRACT:
The disclosure relates to improvements in a hydraulically-actuated control device used in an operation unit of treatment chair and the like in an interlocking relation with reciprocating movement of a hydraulic piston. The device is of the construction in which two control valves slow in closing and opening operation are disposed in the oil supply and discharge passages leading to a hydraulic cylinder having a hydraulic piston therein so as to prevent shock in starting and stopping of the operation unit by controlling opening and closing of the two control valves and operation of the hydraulic pump disposed in the oil supply passage.

REFERENCES:
patent: 2102865 (1937-12-01), Vickers
patent: 2611246 (1952-09-01), Ackerman
patent: 2696403 (1954-12-01), Baugh
patent: 2702508 (1955-02-01), Peterson
patent: 2748569 (1956-06-01), Jackson
patent: 3218804 (1965-11-01), Johnson

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