Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1997-09-18
1999-02-23
Luebke, Renee S.
Electricity: circuit makers and breakers
Electric switch details
Contact
200560, 200325, 335195, H01H 7710
Patent
active
058746994
ABSTRACT:
A molded case circuit breaker has a moving conductor assembly which includes a modular carrier assembly incorporating a plurality of spring biased contact cam members each of which engages contact pressure lobes on a pair of contact arm laminations to provide contact pressure. In response to the magnetic repulsion forces generated by a short circuit, the springs compress allowing the cam members to pivot and side step the contact pressure lobes so that the contact arm blows-open with little resistance. The cam members and springs are preassembled in a transverse channel in the carrier body and laterally retained in place by side plates for easier pivotal attachment of the contact arm laminations to the lobes on the side plates. The side plate lobes raise the contact arm relative to the mass of the carrier to reduce eddy current heating and provide a positive off indication for welded contacts by restricting movement of lower toggle links of the operating mechanism which are coplanar with the side plates. A modular crossbar includes molded bearings engaged by or made integral with hexagonal metal shaft sections which extend into hex openings in the carrier bodies of adjacent poles.
REFERENCES:
patent: 4540961 (1985-09-01), Maier
patent: 4845459 (1989-07-01), Manthe et al.
patent: 4864261 (1989-09-01), Kandatsu
patent: 5260533 (1993-11-01), Livesey et al.
patent: 5341191 (1994-08-01), Crookston et al.
Beck Henry Richard
Fischer Kenneth Martin
Helms Roger William
Humbert Joseph Bell
Little David Edward
Eaton Corporation
Luebke Renee S.
Moran Martin J.
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