Key operated electric ground switch

Electricity: circuit makers and breakers – High-potential type – Rotating and pivoted

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Details

200153L, 200 4, H01H 928

Patent

active

039695972

ABSTRACT:
A lockable electric grounding switch comprises a two-piece switch housing which has an upper conductive portion into which a hollow cylindrical insulating portion is inserted, with the two portions secured together. The upper conductive portion has a slot in it for accommodating a key, and cam surfaces are provided on the underside of the end of the conductive housing to cause the key to be cammed downwardly when it is rotated to push a resiliently biased metal contact out of engagement with a shoulder of the metal portion of the housing. This opens the circuit between a terminal mounted in the other end of the insulating portion of the housing. The contact and the terminal are normally electrically interconnected by a compression spring which biases the contact into engagement with the metal housing when the key is removed or is rotated to an "off" position.

REFERENCES:
patent: 1089167 (1914-03-01), Wacker
patent: 3257517 (1966-06-01), Sedley

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