Continuous ground and polarity monitor

Claim 1

A ground-absence detector device for use with a three prong plug engagable in a mating electrical receptacle having hot and neutral line terminals and a ground terminal, the detector device comprising: a wafer-like member having three apertures therein, said apertures being spatially arranged and configured to receive the three prongs of said three-prong plug, said wafer-like member having a predetermined thickness which is small enough to permit the installation of said wafer-like member on said prongs betWeen the body of said plug and said mating receptacle; an electrical indicating means affixed to said wafer-like member; and means for electrically couping said indicating means across said hot line terminal and said ground terminal, said coupling means including: an electrical contact disposed at the aperture of said waferlike member which receives the prong of said plug corresponding to said hot line terminal, said contact being configured to frictionally engage said last named prong; a length of cord extending from said wafer-like member and having an end terminal connectable to a ground point on an electrical appliance associated with said plug; and conductor means for coupling said indicating means to said contact and said cord.