Floating fluid-operated actuator

Details Floating fluid-operated actuator Floating fluid-operated actuator

1991-05-17

1992-04-28

Look, Edward K.

Power plants

Pressure fluid source and motor

Pump means moves motive fluid from one chamber to an...

91459, 25112914, 2511291, F16D 3102

Patent

active

051076780

ABSTRACT:
The piston of a reciprocating hydraulic actuator carries a pump which is driven by an electric motor and which supplies oil from the low pressure chamber of a cylinder to the high pressure chamber thereof in order to advance the piston. An exhaust valve in the piston is normally held in a closed position by magnetic force created by energizing a coil and, when closed, enables pressurization of the high pressure chamber of the cylinder. When a second coil is energized, the magnetic field of the first coil is negated and the valve is opened by a spring to permit oil to exhaust from the high pressure chamber to the low pressure chamber and permit a second spring to retract the piston. If both the pump motor and the second coil are de-energized, the first coil keeps the valve closed and causes the piston to remain in a commanded position. The actuator may be controlled by a floating single pole, double throw switch and its piston is automatically shifted to its fully retracted position by the second spring if electrical power to the actuator is lost.

REFERENCES:
patent: Re16140 (1925-08-01), Erickson
patent: 1834506 (1931-12-01), Stukenborg
patent: 2981199 (1961-04-01), Weissmann et al.
patent: 3036598 (1962-05-01), Smith et al.
patent: 4982902 (1991-01-01), Knapp et al.

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