Electrical device with retractable grounding pin and indicating

Details Electrical device with retractable grounding pin and indicating Electrical device with retractable grounding pin and indicating

1975-11-05

1977-04-05

Lake, Roy

Geometrical instruments

339 45M, 339113L, H01R 306

Patent

active

040158888

ABSTRACT:
A portable electrical device has a molded body having a cavity closed by a rear wall. Two conductive prongs project through the rear wall for reception into a phase port and a neutral port, respectively, of an electrical outlet. A retractable grounding pin or prong, when in an extended position, extends outwardly from the rear wall in parallel spaced relationship with the two prongs and is receivable by a ground port of the outlet if there is one. When the device is used with an electrical outlet not having a ground port, the grounding pin retracts within the cavity against a spring bias. An indicating pin is operatively connected to the grounding pin and moves, in response to retracting movement of the grounding pin, to an exposed position within a recess in a front wall of the body to provide a visual indication that the device is not grounded by the grounding pin.

REFERENCES:
patent: 3171183 (1965-03-01), Johnston
patent: 3754202 (1973-08-01), Nelson
patent: 3786392 (1974-01-01), McDaniel
patent: 3924914 (1975-12-01), Banner

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