Control of continuous reciprocation of a fluid power cylinder

Details Control of continuous reciprocation of a fluid power cylinder Control of continuous reciprocation of a fluid power cylinder

1981-11-02

1985-01-01

Garrett, Robert E.

Motors: expansible chamber type

Cyclically operable

Working member controlled motive fluid for distributor motor

91308, 91311, 60381, 13762415, F01L 3102

Patent

active

044910550

ABSTRACT:
The pump or pumps for supplying fluid to the two ends of a double-acting cylinder include a direction control, such as a direction control valve, shiftable between extend and retract conditions. A drive mechanism for the direction control includes a rotary hydraulic motor and a driven rotary drive mechanism for shifting the direction control. Hydraulic fluid is supplied to the drive motor through parallel connected start and stop valves. The start valve is opened in response to the movements of the hydraulic cylinder toward a stroke limit. The stop valve is operated in response to the shifting of the direction control, so that the motor is operated intermittently to reverse the direction control when the cylinder reaches the limit of an extend or retract stroke. The stop valve is controlled by the drive mechanism in timed relation with the shifting of the direction control. The start valve may be closed by that drive mechanism in timed relation with the opening of the stop valve.

REFERENCES:
patent: 2437115 (1948-03-01), Muller et al.
patent: 3324770 (1967-06-01), Dahlman et al.
patent: 3620126 (1971-11-01), Fuhrimann
patent: 3735669 (1973-05-01), Henke et al.
patent: 3916768 (1975-11-01), Martin

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