Terminal fastener and instrument tap

Claim 1

A combination switch terminal fastener means and instrument tap for a high amperage bolted pressure contact switch of the type comprising an insulator base and having switch terminals of hard copper with each switch terminal having a flange abutting said insulator base, and a smooth-walled mounting aperture extending through said flange, said fastener means and instrument tap including: a cylindrical steel insert, having a knurled portion press-fit into said mounting aperture of said switch terminal flange, and an enlarged head portion incapable of being inserted into said mounting aperture, said enlarged head portion having a radially extending end surface facing the terminal flange, and a threaded hole extending axially of said cylindrical insert; an instrument connection terminal having a flat base portion engaged and held in firm electrical contact with said switch terminal flange by said radially extending end surface of said insert head portion and an offset portion including means for attachment to an electrical instrument; and a bolt extending through said insulator base and engaging said threaded hole of said cylindrical insert to mount said switch terminal flange on said insulator base and to afford increased contact pressure between said instrument connection terminal and said switch terminal flange.