Hydraulic disk brake circuit for crane draw works

Details Hydraulic disk brake circuit for crane draw works Hydraulic disk brake circuit for crane draw works

1983-04-22

1985-08-13

Reger, Duane A.

Fluid-pressure and analogous brake systems

With pump

303 9, 303 85, 303 2, B60T 1314

Patent

active

045345988

ABSTRACT:
An improved system for control of a drum having a disk brake and pawl engageble therewith, including a pressure sensing switch electrically connected with a solenoid valve which is hydraulically connected with a pump and an accumulator teed into the supply from the pump. A solenoid valve, when energized hydraulically connecting a pawl cylinder attached to the pawl with pump pressure and when de-energized directing fluid pressure to apply the brake and dumping the pawl cylinder to reservoir to engage the pawl. Orifice means control the rates of flow to and from the brake and pawl cylinder to avoid shock loads and to assure the drum is stopped before the pawl is engaged.

REFERENCES:
patent: 3003822 (1961-10-01), McCarthy
patent: 3672729 (1972-06-01), Blakey
patent: 3724609 (1973-04-01), Kobald
patent: 3743363 (1973-07-01), Hodge et al.
patent: 3796467 (1974-03-01), Kito et al.
patent: 3871714 (1975-03-01), Behrend
patent: 4003605 (1977-01-01), Fannin
patent: 4076323 (1978-02-01), Kroth

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