Multiple speed hoisting system with pressure protection and load

Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...

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Details

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.

REFERENCES:
patent: 2431032 (1947-11-01), Ernst
patent: 2500627 (1950-03-01), Chinn
patent: 2800110 (1957-07-01), Haarmeyer
patent: 3018902 (1962-01-01), Minty
patent: 3313316 (1967-04-01), Thomas
patent: 3335739 (1967-08-01), Rice
patent: 3768263 (1973-10-01), Olson et al.
patent: 3788076 (1974-01-01), Lansky et al.
patent: 3824896 (1974-07-01), Tull
patent: 3864915 (1975-02-01), Metailler

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