Hydraulically-operated breaking device

Details Hydraulically-operated breaking device Hydraulically-operated breaking device

1981-12-10

1985-05-14

Maslousky, Paul E.

Motors: expansible chamber type

Working member position responsive motive fluid control

91417R, 91457, 91459, 91461, 200 82R, F15B 1517, F15B 13044, F15B 13043

Patent

active

045164720

ABSTRACT:
A hydraulically-operated breaking device of this invention uses a hydraulically-operated differential piston for driving an electric circuit switching unit, and making and breaking pilot valves for actuating the differential piston. In this device, a control valve operated by the action of the pilot valves includes two poppet valves, and drives an intermediate valve which drives the differential piston. Further, the control valve can perform a quick operation at breaking, and can accomplish a given operation even with use of impulse command signals to operate the pilot valves or even in case of a liquid pressure drop during the operation. Furthermore, the use of an auxiliary valve and an auxiliary switch provides the device with a simultaneous action preventive function, pumping action preventive function, and breaking operation preference function.

REFERENCES:
patent: 2775982 (1957-01-01), Canfield
patent: 2900960 (1959-08-01), Gratzmuller
patent: 3969985 (1976-07-01), Grieger et al.
patent: 4343972 (1982-08-01), Bischofberger et al.

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