Bidirectional, multiple speed hydraulic actuator

Details Bidirectional, multiple speed hydraulic actuator Bidirectional, multiple speed hydraulic actuator

1979-09-28

1982-03-09

Cohen, Irwin C.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

One path includes restriction

91 32, 91415, 91416, 91417R, 13762568, F15B 1304, F15B 1517

Patent

active

043183336

ABSTRACT:
A bidirectional, multiple speed hydraulic actuator, including a differential piston (10, 24, 26). First and second ports (28, 30) are respectively in fluid communication with opposite sides of the piston and there is provided a pressure fluid supply line (40) along with a pressure fluid drain line (44). A control valve (14) is disposed between the ports and the lines and is movable step-wise through five positions providing for nulling of piston movement, and slow and rapid piston movement in either of two directions. A shifting device (60) is provided for the valve.

REFERENCES:
patent: Re25882 (1965-10-01), Bower
patent: 2604075 (1952-07-01), Naud
patent: 2612184 (1952-09-01), Evans
patent: 2674850 (1954-04-01), Svenson et al.
patent: 2843093 (1958-07-01), Vltavsky
patent: 2855752 (1958-10-01), Brusque
patent: 2986124 (1961-05-01), Allemann
patent: 3094173 (1963-06-01), Hausmann et al.
patent: 3472281 (1969-10-01), Chiba et al.
patent: 3604884 (1971-09-01), Olsson

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