Motors: expansible chamber type – Extension of unit having separately controlled working... – Vane
Patent
1986-06-13
1988-02-23
Cohan, Alan
Motors: expansible chamber type
Extension of unit having separately controlled working...
Vane
92 52, 92 53, F15B 1116
Patent
active
047262818
ABSTRACT:
A multistage cylinder having a partial force mode, a full force extended mode, and a full force retracted mode, and having an outer cylinder closed at one end and open at the other, one or more intermediate cylinders located within the outer cylinder, and extendable and retractable with respect thereto, an inner drive member within the intermediate cylinder, and extendable and retractable with respect thereto, intermediate hydraulic fluid conduits in the drive member for flow of hydraulic fluid and from the intermediate cylinder, and an intermediate valve for controlling flow of fluid thereto, outer cylindrical hydraulic fluid supply and return conduits connecting directly with an outer cylinder, separate from the intermediate conduits, and an outer cylinder valve for controlling flow of fluid independent of the intermediate cylinder and a fluid flow barrier between the intermediate cylinder and the outer cylinder so that fluid from the intermediate cylinder is maintained out of contact with the outer cylinder.
REFERENCES:
patent: 2933070 (1960-04-01), Trumper
patent: 3190307 (1965-06-01), DeVries
patent: 3696712 (1972-10-01), Sung
patent: 3823937 (1974-09-01), Moore
patent: 4380244 (1983-04-01), Caudill
Cohan Alan
Rolston George A.
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