Geometrical instruments
Patent
1976-05-13
1978-03-14
Lake, Roy
Geometrical instruments
339195A, 339255R, H01R 306
Patent
active
040788482
ABSTRACT:
A convertible electrical plug is disclosed in which one of the prongs is a retractable grounding prong movable between a forwardly projecting active position and a rearwardly projecting inactive position, the grounding prong being releasably locked in the active position for insertion into a three-prong receptacle and movable to the inactive position for insertion of the plug into a two-prong receptacle. In one form of the invention, the grounding prong is axially reciprocable in a metal tube connected to the ground wire of the electrical cord, and a manually engageable latch releasably locks the grounding prong in its active position. A spring is provided for automatically urging the grounding prong to its latched, active position. In another form of the invention, the grounding prong has an end pivotally mounted in a channel in the plug body, with the prong being swingable about the pivot between its active position and inactive position. The channel is metallic and electrically conductive and is connected to the ground wire of a three-wire electrical cord. The lips of the conductive channel are made to project inwardly and resiliently engage the grounding prong, releasably locking the grounding prong in either its active or inactive position.
REFERENCES:
patent: 2986718 (1961-05-01), Bender, Jr.
patent: 3754202 (1973-08-01), Nelson
patent: 3786392 (1974-01-01), McDaniel
patent: 3922600 (1975-11-01), Roveti
Jones DeWalden W.
Lake Roy
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