Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber
Patent
1974-08-12
1976-10-26
Cohen, Irwin C.
Motors: expansible chamber type
Fluid supply through diverse paths to single expansible chamber
91411R, 91461, 137118, F15B 1116, F15B 1306
Patent
active
039877035
ABSTRACT:
A hydraulic control system having a load-lifting hydraulic motor, a source of pressurized fluid and a pilot-operated directional control valve for directing fluid for operation of the motor is provided with a combined restrictor and shuttle valve assembly that is operative to direct fluid from a pump for pilot-operation of the main control valve when the pump is in operation, but is operative upon failure of the pump system to provide pressure from the load-lifting side of the lifting motors to a pilot control valve for pilot operation of the directional control valve. This assembly provides an emergency source of hydraulic pilot fluid for pilot operation of the main control valve for lowering the implements or load supported by the hydraulic motors should the engine of the vehicle fail.
REFERENCES:
patent: 2946347 (1960-07-01), Ruhl
patent: 3215156 (1965-11-01), De Corte et al.
patent: 3350986 (1967-11-01), Berta et al.
patent: 3604313 (1971-09-01), Fruehauf
patent: 3620129 (1971-11-01), Fruehauf
patent: 3738107 (1973-06-01), Miller
patent: 3780623 (1973-12-01), Hohlein
patent: 3862643 (1973-02-01), Dezelan et al.
Caterpillar Tractor Co.
Cohen Irwin C.
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