Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1976-05-04
1979-03-06
Cohen, Irwin C.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60483, 60DIG2, 91420, 91436, F01C 1100, F15B 1306
Patent
active
041423690
ABSTRACT:
A multiple speed hoisting system has a first fluid circuit, with a maximum effective cross-sectional area for hoisting heavy loads at low speed, and a second fluid circuit, with a smaller effective cross-sectional area for hoisting lighter loads at higher speed. These circuits are separately actuated by a valve that is responsive to a regulating means for selectively positioning the valve. A pressure operated control, that is in flow communication with the second fluid circuit, automatically cancels the influence of the valve regulating means, in response to a predetermined pressure level in the second fluid circuit, and allows the valve to revert to a position actuating the first fluid circuit. Undesirable oscillations within the system between the pressure operated control and the valve regulating means are avoided. In a preferred embodiment of the invention, a pressure switch is the pressure operated control, a solenoid that is actuated by a manual control switch forms the regulating means for selectively positioning the valve, and a relay is provided to stabilize the electrical control circuit, thereby prevent hunting between the pressure switch and the solenoid controlled valve.
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patent: 3824896 (1974-07-01), Tull
patent: 3864915 (1975-02-01), Metailler
Cohen Irwin C.
Edwards J. W.
FMC Corporation
Verhoeven J. F.
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