Hydraulic driving device

Details Hydraulic driving device Hydraulic driving device

1978-07-06

1981-09-15

Cohen, Irwin C.

Motors: expansible chamber type

Cyclically operable

Working member controlled motive fluid for distributor motor

91403, 91453, 91461, F01L 2502, F15B 13042

Patent

active

042890632

ABSTRACT:
A hydraulic driving device of a circuit breaker which opens and closes a system in response to two signals is principally constructed of a cylinder, a piston, and a main control valve for controlling the motion of the piston. A spool adapted to slide within the main control valve has its motion controlled by four pressure faces. The first pressure face is normally subjected to a high oil pressure. The second pressure face receives a low oil pressure upon application of the first signal, and a high oil pressure upon release thereof. The third pressure face receives a high oil pressure upon application of the second signal, and a low oil pressure upon release thereof. A high or low oil pressure acts on the fourth pressure face in correspondence with the piston motion. The magnitudes of the forces on the respective pressure faces of the spool are set in a predetermined relationship.

REFERENCES:
patent: 1965914 (1934-07-01), Tolkien
patent: 2157240 (1939-05-01), Keel
patent: 2587571 (1952-02-01), Lombard
patent: 3090364 (1963-05-01), Lefevre
patent: 3162093 (1964-12-01), Zoller
patent: 3543642 (1970-12-01), Seamone
patent: 3804122 (1974-04-01), Ruhl et al.
patent: 3969985 (1976-07-01), Grieger et al.
patent: 4139015 (1979-02-01), Sakai

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