Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1983-12-19
1985-11-05
Shepperd, John W.
Electricity: circuit makers and breakers
Electric switch details
Contact
H01H 134
Patent
active
045515972
ABSTRACT:
A molded case circuit breaker includes an adjustable stationary lower electrical contact having a one-piece formed conductive contact and a separately formed spacer bracket. One longitudinal end of the formed contact forms an external electrical terminal of the circuit breaker. The formed contact also includes a base portion and a stationary contact arm that has a contact for physically and electrically contacting a movable upper electrical contact of the circuit breaker fixedly secured at its other longitudinal end. The spacer bracket includes a base portion spaced above the base portion of the formed contact by a plurality of deflectable legs. The spacer bracket also includes a contact support portion fixedly secured to the underside of the stationary contact arm. A threaded aperture is formed through the base portion of the spacer bracket for the receipt of a mounting screw. By tightening or loosening the mounting screw, the vertical distance between the contact secured to the stationary contact arm and the base of the circuit breaker can be precisely adjusted and maintained. Blow-apart capability is provided by the elongated current path through the stationary contact arm that is generally parallel to an elongated current path along the movable upper electrical contact.
REFERENCES:
patent: 2757254 (1956-07-01), Wells et al.
patent: 2820858 (1958-01-01), Tompkins
patent: 2827535 (1958-03-01), Simons
patent: 3200213 (1965-08-01), Murphy
patent: 4144427 (1979-03-01), Gryctko et al.
patent: 4214136 (1980-07-01), Rossi et al.
patent: 4273979 (1981-06-01), Berndt et al.
Shepperd John W.
Westinghouse Electric Corp.
Yatsko M. S.
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