Double-hydraulic actuator

Details Double-hydraulic actuator Double-hydraulic actuator

1977-06-16

1978-09-12

Schwadron, Martin P.

Motors: expansible chamber type

Differential

91448, 13759612, 1376371, F15B 1116

Patent

active

041128249

ABSTRACT:
Control means for a double-hydraulic actuator. In a hydraulic actuator hag at least two mechanically coupled servomotors, there is provided valve means for at least one of said motors wherein an internal spool valve is surrounded by a sleeve valve which in turn is itself surrounded by an outer sleeve, the sleeve valve constituting a sleeve surrounding and operable with respect to the spool valve and said sleeve valve itself constituting an axially movable valve with respect to said outer sleeve and force limiting means connecting said spool to said sleeve valve in such a manner that in normal operation same will move as a single unit but upon interference with movement between said sleeve valve and said sleeve, force applied to the spool valve will override said force limiting means and effect relative motion between said spool valve and said sleeve valve.

REFERENCES:
patent: 3253613 (1966-05-01), Richolt
patent: 3527143 (1970-09-01), Hayter
patent: 3529514 (1970-09-01), Mayo
patent: 3878764 (1975-04-01), Zech
patent: 3933176 (1976-01-01), Wheeler

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