Electricity: circuit makers and breakers – Electric switch details – Cases and bases
Patent
1981-11-18
1984-04-17
Tolin, G. P.
Electricity: circuit makers and breakers
Electric switch details
Cases and bases
361345, 200 50AA, H02B 1104
Patent
active
044436769
ABSTRACT:
A shield unit for interchangeable fit within circuit breaker compartments of various manufacture contains a split linkage arrangement of two pivotally connected arms, a return spring and a connecting spring to operate a shield linkage mechanism. The shield assembly comprises two moveable shields brought into a closed configuration when a circuit breaker is removed from the breaker compartment and into an open configuration when the circuit breaker is inserted within the breaker compartment. The interposition of the moveable shields between the power stabs within the breaker compartment and the breaker plugs prevents inadvertent contact by an operator when the circuit breaker unit is disconnected from the stabs. A balanced arrangement of shield linkage mechanisms on both sides of the shield unit prevents manual operation by an operator in any attempt to bypass the shield unit.
REFERENCES:
patent: 3121144 (1964-02-01), Tjebben
patent: 3614350 (1971-10-01), Eichelberger
patent: 3920939 (1975-11-01), Ciboldi
patent: 4183073 (1980-01-01), Clausing
patent: 4285026 (1981-08-01), Clausing
Bernkopf W. C.
General Electric Company
Jacob Fred
Menelly R. A.
Tolin G. P.
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