Ground and polarity monitoring apparatus including means to corr

Details Ground and polarity monitoring apparatus including means to corr Ground and polarity monitoring apparatus including means to corr

1976-03-22

1978-09-05

Lake, Roy

Geometrical instruments

324 51, 339 14P, 339154A, H01R 300

Patent

active

041115163

ABSTRACT:
Apparatus for use with a source of A.C. electrical power and for monitoring both the ground and polarity integrity thereof. The apparatus, which is configured to receive a polarized electrical plug, makes connection with the normally hot, neutral and ground outputs of the source of electrical power and includes a normally open indicating circuit connected to the normally hot power output. Insertion of the polarized electrical plug completes the circuit to the normally ground output and, if the ground line is intact and the polarity proper, the indicating circuit provides an indication of this fact. If, on the other hand, either the ground line is open or the polarity is improper, the indicating circuit will indicate that the source is unsafe to use. Means are also disclosed for correcting an improperly polarized service receptacle and for providing safety indications directly in combination with an electrical tool or the like.

REFERENCES:
patent: 2861324 (1958-11-01), Klumpp, Jr.
patent: 3381258 (1968-04-01), Becker, Jr.
patent: 3924914 (1975-12-01), Banner

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