Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1978-04-26
1979-05-29
Stephan, Steven L.
Electricity: circuit makers and breakers
Liquid contact
Time delay
188 1B, 188 85, H01H 302
Patent
active
041568036
ABSTRACT:
An operating device for an electric circuit breaker includes a closing spring and a rotatable spring-controller mounted for rotation between first and second dead center positions with respect to the spring. The spring is charged by transmitting rotational forces to the spring-controller. One end of a connecting link is pivotally connected to a point on the spring-controller which is eccentric with respect to the center of rotation of the spring-controller. Another end of the connecting link is connected to an operating mechanism of the circuit breaker. Circuit breaker closing is effected by allowing the spring to quickly discharge after a charging operation. Damping means is provided for imposing a damping load on the spring-controller substantially only after it has performed its useful work and is undergoing subsequent oscillations. The damping means causes the duration of the oscillations to be substantially reduced so that the spring-controller is rapidly brought to rest. In one embodiment, the damping means comprises a braking member coupled to the connecting link. In this embodiment, the braking member includes a L-shaped brake support member a portion of which is connected to the spring-controller at the pivot end of the connecting link. Another portion of the brake support member includes a brake shoe mounted thereon. The damping load is automatically exerted by the brake shoe near the end of the spring discharging stroke without the need to transmit forces to any stationary support structure.
REFERENCES:
patent: 2829737 (1958-04-01), Favre
patent: 2909629 (1959-10-01), McCloud
patent: 2972259 (1961-02-01), Favre
patent: 4019008 (1977-04-01), Kohler
Freedman William
General Electric Company
Silverman Carl L.
Stephan Steven L.
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