Isolation shields for a 2500-4000 amp circuit breaker compartmen

Details Isolation shields for a 2500-4000 amp circuit breaker compartmen Isolation shields for a 2500-4000 amp circuit breaker compartmen

1982-02-16

1984-05-08

Truhe, J. V.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

361335, 361345, H01H 900

Patent

active

044476825

ABSTRACT:
A shield mechanism for isolating line and load stabs within a 2500-4000 ampere circuit breaker compartment is disclosed having a primary operating arm for operating a lower moveable shield and an upper moveable shield interconnected by a reversing bell crank link. Interconnection between the bell crank link and an intermediate lever is made by means of a lower expansion link. The corresponding downward motion fo the lower expansion link, when the circuit breaker is inserted in the compartment, forces the upper moveable shield to pivot into an open clockwise direction by connection between the upper moveable shield, the bell crank link and an upper expansion link against the force exerted by a return spring. Direct connection between the lower moveable shield and the intermediate lever forces the lower moveable shield into an open counterclockwise direction. Removing the circuit breaker from the compartment releases the shield operating mechanism primary operating arm from contact with the back surface of the breaker. This allows the primary operating arm to return in a clockwise direction under the return spring force. Direct connection between the intermediate lever and the lower moveable shield forces the lower moveable shield into a closed clockwise direction while the upper moveable shield simultaneously moves into a closed, counterclockwise direction by means of the reversing bell crank link and the return spring force.

REFERENCES:
patent: 2128149 (1938-08-01), Linde
patent: 3614350 (1971-10-01), Eichelberger
patent: 4386246 (1983-05-01), Castonguay

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