Combined servo control and jack unit

Details Combined servo control and jack unit Combined servo control and jack unit

1986-09-15

1988-03-29

Garrett, Robert E.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91443, 92 136, F15B 910

Patent

active

047336013

ABSTRACT:
There is disclosed a combined servo control and jack unit which comprises a casing, an actuated piston slidably disposed in a piston chamber and having a piston rod extending outwardly of the casing. A servo valve chamber, axially parallel to the piston chamber, has slidably mounted therein a spool and also a sleeve member which is mechanically connected to the piston rod. Shifting the spool in either axial direction directs hydraulic fluid to one or the other side of the piston, thus moving the latter until spool stopping, at which time the sleeve automatically, almost instantly, blocks off the flow in the new position. A variable speed, gradual action of the piston is obtained without hydraulic shock or cavitation.

REFERENCES:
patent: 2221150 (1940-11-01), Rebeski
patent: 2462932 (1949-03-01), Anderson
patent: 2470099 (1949-05-01), Hall
patent: 2708909 (1955-05-01), Curlett
patent: 2882683 (1959-04-01), Sinclair
patent: 3044266 (1962-07-01), Svenson
patent: 3083892 (1963-04-01), Carey et al.
patent: 3086595 (1963-04-01), Nichols
patent: 3875849 (1975-04-01), Patel
patent: 4192346 (1980-03-01), Iizumi
patent: 4320693 (1982-03-01), Benjamin
patent: 4375942 (1983-03-01), Olson

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