Vacuum circuit breaker with improved means for limiting overtrav

Details Vacuum circuit breaker with improved means for limiting overtrav Vacuum circuit breaker with improved means for limiting overtrav

1976-04-26

1977-12-20

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200288, 200153H, 200148F, H01H 3366

Patent

active

040643832

ABSTRACT:
A vacuum-type circuit breaker comprises a conventional wipe mechanism interposed between an operating member and the movable contact of the breaker. The wipe mechanism comprises a driven part coupled to the movable contact, a driving part coupled to the operating member but movable with respect thereto, and preloaded spring means between said driving and driven parts.
First stop means is provided for stopping said operating member at the end of its circuit-breaker opening stroke with such abruptness that said driven member, against the opposition of said spring means, overruns the driving member following such stopping. Such overrunning of the driven member is limited by second stop means comprising a stop carried by said operating member. This stop engages the driven member and thus blocks said overrunning after a limited amount of such overrunning sufficiently low to prevent damage to the usual bellows of the vacuum circuit breaker despite thousands of excursions of the driven member through said overrunning travel.

REFERENCES:
patent: 3163735 (1964-12-01), Miller
patent: 3180960 (1965-04-01), Barkan et al.
patent: 3211866 (1965-10-01), Crouch et al.
patent: 3624329 (1971-11-01), Fischer et al.
patent: 3787649 (1974-01-01), Goodwin, Jr. et al.

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