Hydraulic oil power unit including improved switching device

Details Hydraulic oil power unit including improved switching device Hydraulic oil power unit including improved switching device

1996-07-31

1997-10-28

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Condition responsive control of or by input to input pump...

F16D 3102

Patent

active

056807619

ABSTRACT:
A hydraulic oil power unit includes a motor for driving a hydraulic pump, a piston driven by the hydraulic pump, a driving power supply for the motor and a switch for providing the driving power supply for the motor. A switching device includes a semiconductor for switching on and off a conductive path for the motor, a detecting circuit for detecting the completion of the motion of the piston from a motor current fed with the motor and a holding circuit for holding the switching device in a non-conductive state while the switch is closed based on a detection signal from the detecting circuit indicating a detection of the completion of the motion of the piston.

REFERENCES:
patent: 4881371 (1989-11-01), Haeder et al.
patent: 5063740 (1991-11-01), Aihara
patent: 5117632 (1992-06-01), Strenzke
patent: 5335750 (1994-08-01), Geringer et al.

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