Double actuator with bypass lines for synchronized movement

Details Double actuator with bypass lines for synchronized movement Double actuator with bypass lines for synchronized movement

1991-01-07

1991-12-17

Look, Edward K.

Motors: expansible chamber type

Relatively movable working members with one having motive...

Synchronizing in response to sensed difference in positions

91189R, 60546, F01B 2504, F15B 700

Patent

active

050726498

ABSTRACT:
Hydraulic fluid under pressure is selectively supplied to multiple drive cylinders that are interconnected to one another and which have bypass lines allowing excess fluid to return to the source of hydraulic fluid as needed. Each drive cylinder receives a double acting piston and each piston is carried by and axially displaces a component pump shaft as it reciprocates within the drive cylinder under the influence of hydraulic pressure. A free end of each pump shaft carries a trip member that trips upper and lower limit switches when the piston reaches its top dead center and bottom dead center positions, respectively. The limit switches, when tripped, send electrical signals to a process computer that adjusts the system by opening and closing predetermined solenoid-operated mechanical valves to insure that each pump pumps a component at a predetermined ratio to the other pumps even if the pumps have differing capacities per pumping stroke and even if oil leaks around the piston seals or otherwise leaks from the system.

REFERENCES:
patent: 3152503 (1964-10-01), Pearson
patent: 3184920 (1965-05-01), Lohbauer et al.
patent: 3387757 (1968-06-01), Graffy et al.
patent: 3636817 (1972-01-01), Shapiro
patent: 3648565 (1972-03-01), Probst et al.
patent: 3722366 (1973-03-01), Richardson
patent: 3805530 (1974-04-01), Richardson
patent: 4151785 (1979-05-01), Koschek
patent: 4192222 (1980-03-01), Dits
patent: 4765509 (1988-08-01), Eisenhut et al.

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