Lock out mechanism for circuit breaker handle operator

Details Lock out mechanism for circuit breaker handle operator Lock out mechanism for circuit breaker handle operator

1996-09-19

1998-10-13

Scott, J. R.

Electricity: circuit makers and breakers

Interlocking

Between switches and housing

200 5019, H01H 920

Patent

active

058214879

ABSTRACT:
The handle operator for a circuit breaker mounted in an enclosure is locked in the OFF position when the enclosure is opened by a lock-out member which directly engages the operator member of the handle operator which contacts and moves the circuit breaker handle. The lock-out member is a metal plate having an engagement edge which is positioned transverse to an engagement edge of the metal plate forming the handle operator member. Preferably, the lock-out member plate has a slot in which the engagement edge of the operator plate is received. The operator plate is pivotally mounted for rotation in its own plane and the lock-out plate slides parallel to the operator plate and has a flange providing the engagement edge which engages the operator plate at a point where any attempt to rotate the operator plate to move the circuit breaker handle toward the ON position, jams the lock-out plate into tighter contact with the operator plate. Preferably, the flange of the lock-out plate is bent at an angle which places it perpendicular to the engagement edge of the operator plate when engaged.

REFERENCES:
patent: 2695934 (1954-11-01), Wills
patent: 3171908 (1965-03-01), Malota
patent: 3848102 (1974-11-01), Jencks et al.
patent: 3970808 (1976-07-01), Gryctko et al.
patent: 4835350 (1989-05-01), Ozu et al.
patent: 4851621 (1989-07-01), Borchardt et al.
patent: 5302925 (1994-04-01), Castonguay et al.
patent: 5493084 (1996-02-01), Whitaker et al.
Instructions for Vari-Depth Operating Mechanisms for Types EB, EHB, FB and F-Frame Series C Circuit Breakers, and Type HMCP (Sizes 0-4) Motor Circuit Protectors, Westinghouse I.L. 13698-F, Feb. 1992.

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