Motors: expansible chamber type – With motive fluid valve – Independent control of bypass between opposed working chambers
Patent
1973-10-26
1976-03-16
Cohen, Irwin C.
Motors: expansible chamber type
With motive fluid valve
Independent control of bypass between opposed working chambers
91445, 91447, 91461, 13759615, F15B 1108, F15B 13042
Patent
active
039438252
ABSTRACT:
A load supporting hydraulic system having a pilot operated main control valve is provided with pilot controlled load check valve operative to permit free flow of fluid from said control valve toward the load supporting means of the system in response to pilot pressure and to block fluid flow from the load supporting means toward the control valve. The system includes valve means operative independent of the main control valve to permit the load check valve to be opened by fluid pressure in the load supporting means to allow fluid flow therefrom to the reservoir. The system further includes safety valve means for blocking fluid flow to pilot control means.
REFERENCES:
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patent: 2750743 (1956-06-01), Korkowski et al.
patent: 3049101 (1962-08-01), Ruhl
patent: 3087467 (1963-04-01), Gresko
patent: 3127688 (1964-04-01), Hein et al.
patent: 3211065 (1965-10-01), Hunger et al.
patent: 3557829 (1971-01-01), Finley
patent: 3606820 (1971-09-01), Thomas
Bianchetta Donald L.
Lohbauer Kenneth R.
Rhodes Sammy J.
Caterpillar Tractor Co.
Cohen Irwin C.
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