Electricity: circuit makers and breakers – Interlocking – Between plural switches
Patent
1976-10-22
1978-07-18
Scott, James R.
Electricity: circuit makers and breakers
Interlocking
Between plural switches
H01H 920
Patent
active
041017447
ABSTRACT:
A four position racking mechanism for a circuit breaker in a cubicle or housing providing Connected, Test, Disconnect and Out positions. The racking lead screw is mounted in the circuit breaker structure in its own support. The rear end of the racking screw is threaded to engage and move a travelling nut which rides in guide slots. The outer ends of the travelling nut engage a pair of connecting links which rotate a pivoted roller bracket. The roller bracket carries a racking roller which engages a cam slot in a member extending from the rear portion of the cubicle or housing. The shape of the cam slot plus the increasing lever arm of the connecting links around the pivot pin on the nut provide a variable racking force which is needed for primary disconnect contact engagement. The central positioning of the racking mechanism makes it suitable for any width of circuit breaker. The racking mechanism is interlocked with the closing mechanism; releasable locking means and interlock means are provided to limit the operation of the racking mechanism to conditions which are safe for the operator; thus, the unlocking of the racking mechanism after the breaker is tripped will hold the trip mechanism and hold it trip free as long as the racking mechanism is unlocked. An indexing element for the slide for the locking mechanism is provided for all the positions of the circuit breaker.
REFERENCES:
patent: 2777024 (1957-01-01), West
patent: 2900464 (1959-08-01), Frink et al.
patent: 3588398 (1971-06-01), Siviy
patent: 3600540 (1971-08-01), Bould
patent: 3681545 (1972-08-01), Cellerini et al.
patent: 3783209 (1974-01-01), Cleaveland et al.
patent: 4002865 (1977-01-01), Kuhn et al.
Gould Inc.
Scott James R.
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