ApplicationNo. 05/634354 filed on 11/24/1975
US Classes:439/662, Screw threads formed on cylindrical or annular contact313/318.03, Having an annular contact disposed concentrically about the longitudinal axis of the envelope313/318.04, Having screw thread coupling contact439/615Having screw-thread-coupling contact
ExaminersPrimary: Lake, Roy
Assistant: Desmond, E. F.
Attorney, Agent or Firm
AbstractA base assembly and method for electric incandescent lamps in which a preformed base insulator and contact eyelet are assembled with a conventional base shell by threading the insulator and contact eyelet as a subassembly into the shell. Provision is made for retaining the insulator and the metallic shell against unthreading rotation either by a direct binding of portions of the insulator and the shell or by serrating the inner edge of an in-turned flange on the shell in a manner to allow threading rotation of the insulator and shell but to prevent unthreading rotation of these parts.