Motors: expansible chamber type – With correlated control of motive fluid and locking means – Common or interconnected valve means control motive fluid...
Patent
1974-10-02
1978-08-08
Freeh, William L.
Motors: expansible chamber type
With correlated control of motive fluid and locking means
Common or interconnected valve means control motive fluid...
91411R, 91461, 214131A, F15B 1526
Patent
active
041049543
ABSTRACT:
The invention is a hydraulic control system for use in positioning and clamping a movable object on a support, which system is adapted to be connected to a source of pressurized hydraulic fluid, to a hydraulically operated piston-cylinder assembly connected to the movable object for moving the movable object and to a hydraulically operated clamp and which comprises a path for the supply of pressurized fluid to and from the hydraulically operated clamp, a check valve in the path which check valve normally prevents return of fluid from the hydraulically operated clamp, a hydraulically operated pilot piston movable between a non-actuating position and an actuating position in which it opens the check valve, a path for the supply of pressurized fluid to the piston-cylinder assembly, which path is connected on its high pressure side to the hydraulically operated pilot piston, and a switching valve for controlling the supply of pressurized fluid to the piston-cylinder assembly, the arrangement being such that when the system is connected to the source of pressurized hydraulic fluid, to the piston-cylinder assembly and to the hydraulically operated clamp, when the switching valve is moved from its neutral position pressurized fluid is supplied to the piston-cylinder assembly to move the movable object and the pressurized fluid also acts on the pilot piston to move it to its actuating position to open the check valve, so that pressurized fluid can flow from the hydraulically operated clamp and the clamping force is relaxed to permit movement of the object.
The invention is particularly useful for a back-hoe on an excavator.
REFERENCES:
patent: 2701552 (1955-02-01), Light
patent: 2769430 (1956-11-01), Geyer
patent: 2778378 (1957-01-01), Presnell
patent: 3176590 (1965-04-01), Uhtenwoldt et al.
patent: 3407946 (1968-10-01), Pilch
patent: 3499543 (1970-03-01), Updegrave
patent: 3541927 (1970-11-01), Iijima
patent: 3543646 (1970-12-01), Iijima
patent: 3610450 (1971-10-01), Demkiw
Iijima Katsuhiko
Jomen Katsumasa
Freeh William L.
Look Edward
Mitsubishi Jukogyo Kabushiki Kaisha
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