Abstract: A smoke/fire detector assembly having a base section with electrical contacts and a removable/attachable sensor section having corresponding electrical contacts. Each one of the electrical contacts is adapted to electrically contact a corresponding one of the base section electrical contacts. Each one of the electrical contacts has a threaded hole formed therein to receive an electrical contact screw. The hole has a projecting rim disposed about a peripheral portion. The base section has a plurality of recessed pocket formed therein for a corresponding one of the plurality of base section electrical contacts. Each one of the pockets has a pair of opposing sidewalls, a platform, and a resilient tongue-like member protruding into a region between the opposing sidewalls. Upper surfaces of the platform and the tongue-like member are disposed in a common plane spaced from the bottom portions of the sidewalls to provide a channel therebetween.

Abstract: Keying and fastening of mating connectors includes pairs of mating key members, ones of which include central apertures through which extend respective jackscrews having threaded leading ends, and the others of which have threaded apertures into which the jackscrews are threaded to fasten the connectors together after the pairs of keys permit connector mating. The keys in which the jackscrews are mounted permit rotating the jackscrews. The jackscrew leading ends are recessed slightly behind the leading ends of hood-like keying projections of the key members for protection against damage and misalignment, and the threaded apertures of the other keys extend to the leading ends of the keying projections thereof which are adapted to receive the corresponding hood-like keying projections in axial recesses along the outer surfaces extending about halfway around the circumference of the key.

Abstract: A system of keying and fastening together a pair of mating connectors is provided where each of the connectors is of the type having forward and rearward thin walled metal shells clinched together about their flanged edges to retain a housing means therewithin, with the forward and rearward shells having adjacent aperture lateral flanges. The system includes a pair of key members each securable to the front of the forward shell at a respective lateral flange, seated within correspondingly hexagonally shaped flange apertures of the forward shell only, held against the front surface of the rearward shell. On one of the connectors a pair of jackscrews extend through the flange apertures and through with the apertures being slightly larger than the jackscrew portions extending therethrough, the jackscrews being apertures of the key members of the one connector, secured rearwardly of the connector by means permitting rotation after mounting and simultaneously securing the key members to the connector.