Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1977-02-28
1978-12-05
Scott, James R.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 9, 337 48, 337 50, H01H 7116
Patent
active
041288220
ABSTRACT:
The following specification describes a circuit breaker trip crossbar having diverging radial surfaces receiving a tapered rail therebetween. The rail extends from the bottom edge of the conventional breaker barrier wall recess and forms a small area pivot adjacent the crossbar axis to reduce the torque required to pivot the bar and to render the torque reproducible for calibration purposes.
The radial surfaces are economically formed by flat mold surfaces in opposite mold halves to avoid mold flash in the pivot area while enabling one of the mold halves to conventionally form the latch plate securing hole in the crossbar.
REFERENCES:
patent: 2824191 (1958-02-01), Christensen
patent: 3233063 (1966-02-01), Platz
patent: 3341791 (1967-09-01), Leonard
patent: 3345591 (1967-10-01), Leonard et al.
patent: 3355685 (1967-11-01), Leonard
patent: 3414850 (1968-12-01), Couper
patent: 3422381 (1969-01-01), Toth
patent: 3758887 (1973-09-01), Ellsworth et al.
patent: 4066989 (1978-01-01), Krueger
Guttman Richard T.
Lesser Norton
Scott James R.
Square D Company
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