Fluid actuating device for an electric circuit breaker

Details Fluid actuating device for an electric circuit breaker Fluid actuating device for an electric circuit breaker

1977-09-01

1982-03-23

Cohen, Irwin C.

Electricity: circuit makers and breakers

Fluid pressure

Piston

91 27, 91417R, F15B 1304, F15B 1517, H01H 3538

Patent

active

043214355

ABSTRACT:
An improved fluid actuating device for an electric switching apparatus such as a high-voltage power circuit breaker or the like includes an actuator for actuating the electric switching apparatus. The actuator has a cylinder and a differential piston movable in the cylinder between first and second end-positions corresponding to the open and closed positions of the switching apparatus. The differential piston has two end-faces for receiving fluid pressure force. One of the two end-faces has a surface area greater than the other one of the two end-faces. A high-pressure fluid supply supplies fluid to the two end-faces and a valve alternately interrupts and passes the fluid from the fluid supply to the one end-face whereby the differential piston is caused to move from the first end-position to the second end-position when the valve passes fluid to act upon the one end-face of the piston. Means are provided for reducing the quantity of the fluid supplied to the one end-face in the course of the movement of the differential piston to the second end-position from the first end-position and before the second end-position is reached.

REFERENCES:
patent: 1005132 (1911-10-01), Atwood
patent: 1126944 (1915-02-01), Bayles
patent: 1430764 (1922-10-01), Smith
patent: 2266415 (1941-12-01), Dinzl
patent: 3105126 (1963-09-01), Peek et al.
patent: 3110783 (1963-11-01), Strom et al.
patent: 3414693 (1968-12-01), Watson et al.
patent: 3416406 (1968-12-01), McCreery
patent: 3450003 (1969-06-01), Nightingale
patent: 3559531 (1971-02-01), Leibfritz et al.
patent: 3832502 (1974-08-01), Grieger et al.

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