Pneumatic operating mechanism for a circuit breaker

Details Pneumatic operating mechanism for a circuit breaker Pneumatic operating mechanism for a circuit breaker

1981-11-13

1984-07-31

Scott, J. R.

Electricity: circuit makers and breakers

Fluid pressure

Piston

200148F, H01H 3342, H01H 3538

Patent

active

044632290

ABSTRACT:
A power circuit breaker has a novel trip valve on the pneumatic operating mechanism for reducing air consumption of the breaker pneumatic operating mechanism. The novel trip valve includes the addition of a valve stem extension to the trip valve shaft disposed in a sliding fit with an exhaust port to the trip valve actuating cylinder which together provide for quick elimination of compressed air from the trip valve actuating cylinder at a predetermined time during the operation of the breaker mechanism. Positive positioning of the breaker contact and rapid closing of the trip valve at a predetermined time is effectuated, thereby reducing air consumption while providing a fail-safe air cushion to the driving piston of the pneumatic mechanism to insure positive positioning of the breaker contacts.

REFERENCES:
patent: 2917602 (1959-12-01), Van Sickle
patent: 3943777 (1976-03-01), Kishi et al.
patent: 3984648 (1976-10-01), Nakanu et al.
patent: 4095068 (1978-06-01), Meyer et al.
patent: 4101748 (1978-07-01), Meyer et al.
patent: 4213020 (1980-07-01), Freeman
patent: 4387280 (1983-06-01), Iman

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