Class Information Number: 439/664 Name:Electrical connectors > With insulation other than conductor sheath > Plural-contact coupling part > Plural-contact coupling part comprises receptacle or plug > Having screw-thread-coupling contact > Screw threads formed on cylindrical or annular contact > Plug having screw-thread-coupling contact and also having resilient or spring-biased center contact Description: Coupling part in the form of a plug having the screw-thread-coupling contact either formed cylindrically around or forming the male portion of the plug, the screw threads being disposed about the exterior surface portion of the contact; and wherein the plug further has a second contact centrally located at the end of the plug on the longitudinally axis along which the plug engages its mating receptacle, the second contact either (a) being formed from resilient material for yieldable movement of the portion thereof along the said longitudinal axis of engagement or (b) being resiliently biased for yieldable movement along the said longitudinal axis of engagement by the action of a spring means associated with the plug.
