Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1975-02-28
1976-08-03
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60486, 91412, 60905, F15B 1309
Patent
active
039721850
ABSTRACT:
A hydraulic system for pipelayers includes a first circuit with a pump and a motor for controlling a boom and a second pump and motor for controlling a hoist with pressure-responsive control means responsive to a first pressure for permitting combining of fluid for operation of the hoist and responsive to a second pressure for preventing combining of said fluid.
REFERENCES:
patent: 2643516 (1953-06-01), Carlson
patent: 2984985 (1961-05-01), MacMillin
patent: 3146593 (1964-09-01), Stacey
patent: 3535877 (1970-10-01), Becker et al.
Caterpillar Tractor Co.
Geoghegan Edgar W.
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