Screw-on electrical connector

In an article of manufacture, a connector for joining the stripped ends of two or more electric wires, including an insulating cap with a generally central bore open at one end and enclosed by an integral end wall at the other end, the cap being of a stiffly flexible plastic material, a generally tapered wire coil in the bore, the large end of the coil being adjacent the open end of the cap and in an interference fit therewith, the coil being tapered toward the closed end wall of the cap and being otherwise out of contact with the cap bore for a substantial distance toward the closed end wall of the cap, thereby creating what would otherwise be an annular air gap, and an annular formation in the air gap constructed and arranged to resist outward expansion of the coil on a controlled basis and to impart characteristics to the coil that it would not otherwise have if it was allowed to expand freely on its own as the connector is screwed down on the stripped ends of two or more electric wires.

In an electrical connector of the screw-on type for joining the stripped ends of two or more electric wires, a cap made of stiffly flexible insulating plastic material having a generally central bore open at one end and closed at the other end by an integral end wall, a generally tapered wire coil in the bore, the outer end of the wire coil being toward the open end of the bore and in engagement with an outer area on the inner surface of the bore, the inner end of the coil being in engagement with an inner area on the inner surface of the bore adjacent the end wall, and an intermediate area in the bore between the inner and outer areas longitudinally in substantially continuous contact with the turns of the coil in their free state in peripherally isolated areas so that outward expansion of the turns of the coil will be yieldably resisted by the intermediate area.

In an electrical connector of the screw-on type for joining the ends of two or more electric wires, a cap of stiffly flexible insulating material having a generally central bore open at one end and enclosed at the other end by an integral end wall, a generally tapered wire coil in the bore, the outer end of the coil being toward the open end of the cap and in engagement with an outer area on the inner surface of the central bore, the inner end of the coil being in engagement with an inner area on the inner surface of the central bore adjacent the end wall, the inner and outer areas on the inner surface of the central bore having a polygonal cross section thereby presenting a number of flat side surfaces, at least one turn at each end of the coil engaging and indenting the flat side surfaces.

In an electrical connector of the screw-on type for joining the ends of two or more electric wires, a cap of stiffly flexible insulating material having a generally central bore open at one end and enclosed at the other end by an integral end wall, a generally tapered wire coil having right hand thread in the bore, the outer end of the coil being toward the open end of the cap and in engagement with an outer area on the inner surface of the central bore, the inner end of the coil being in engagement with an inner area on the inner surface of the central bore adjacent the end wall, the outer area on the inner surface of the central bore being provided with a plurality of left-hand threads which cross-thread and interlock with the outer end of the coil.