Berger

Claim 1

AN ELECTRIC SOCKET SHELL OF THE CHARACTER DESCRIBED, CONSISTING OF: TWO TUBULAR PARTS HAVING CENTRAL AXES, ONE OF SAID PARTS CONSTITUTING A ONE-PIECE CUPSHAPED BASE PART WITH AN APERTURED BOTTOM WALL FOR CONNECTION TO AN ELECTRIC LIGHTING DEVICE AS A PERMANENT PART THEREOF AND FOR PERMANENT ASSOCIATION WITH A SOCKET INTERIOR IN AXIAL ALIGNMENT WITH THE BASE PART, SAID BASE PART BEING SHORTER THAN THE SOCKET INTERIOR WHEREBY THE BASE PART CANNOT COMPLETELY CONCEAL THE SOCKET INTERIOR, THE OTHER OF SAID PARTS CONSTITUTING A ONE-PIECE SLEEVE-SHAPED UPPER PART ROTATABLY COUPLABLE IN PARTIALLY TELESCOPING END-TO-END RELATIONSHIP WITH SAID BASE PART, SAID TWO PARTS SOLELY COOPERATING TO JOINTLY PROVIDE A COMPLETE COVER FOR THE SOCKET INTERIOR, AND RAPID-ACTING DETACHABLE MEANS ENGAGEABLE UPON THE PARTIAL TELESCOPING OF THE TWO PARTS AND RELATIVE ROTATION OF SAID PARTS ABOUT THEIR CENTRAL AXES FOR AXIALLY COMPRESSIVELY SECURING SAID TWO PARTS TO ONE ANOTHER, SAID MEANS INCLUDING A RADIALLY OUTWARDLY OVERHANGING EXTERNAL ANNULAR CAM SURFACE FORMING AN INTEGRAL ELEMENT OF ONE OF SAID PARTS AND SLOPING LONGITUDINALLY OF SAID ONE PART, SAID CAM SURFACE INCLUDING A SUBSTANTIALLY LONGITUDINAL CUT-OUT ENTRY SLOT LEADING FROM AN OPEN END OF SAID ONE PART, A RADIALLY INWARDLY DIRECTED PROTUBERANCE COMPRISING A FOLLOWER FORMING AN INTEGRAL ELEMENT OF THE OTHER OF SAID PARTS AND ADAPTED TO BE MOVED LONGITUDINALLY THROUGH THE ENTRY SLOT TO ENGAGE THE CAM SURFACE WHEN THE TWO PARTS ARE COUPLED AND RELATIVELY ROTATED, SAID CAM AND FOLLOWER COOPERATING UPON SAID COUPLING AND RELATIVE ROTATION TO RELATIVELY MOVE THE TWO PARTS INTO FURTHER TELESCOPING RELATIONSHIP, AND A PAIR OF ABUTMENT MEMBERS ONE OF WHICH IS FORMED INTEGRALLY WITH ONE OF THE PARTS AND THE OTHER OF WHICH IS FORMED INTEGRALLY WITH THE OTHER PARTS, AT LEAST ONE OF SAID ABUTMENT MEMBERS BEING ANNULAR AND BEING POSITIONED IN A PLANE PERPENDICULAR TO SAID CENTRAL AXES, SAID ABUTMENT MEMBERS BEING POSITIONED WITH RESPECT TO THE CAM AND FOLLOWER TO LONGITUDINALLY ABUT ONE ANOTHER WHEN THE COOPERATION BETWEEN THE FOLLOWER AND CAM UPON COUPLING AND RELATIVE ROTATION OF THE TWO PARTS CAUSES SAID TWO PARTS TO MOVE FURTHER INTO TELESCOPING RELATIONSHIP, WHEREBY TO COUPLE THE TWO PARTS TO ONE ANOTHER UNDER PRESSURE IN SAID LONGITUDINAL DIRECTION, THE BASE PART BEING OF FRUSTO-CONICAL CONFIGURATION WITH A WIDE UPPER OPEN END, SAID UPPER END INCLUDING A FRUSTO-CONICAL PORTION OF REDUCED DIAMETER TERMINATING IN A STEP, SAID PORTION CONSTITUTING THE CAM SURFACE AND SAID STEP CONSTITUTING THE ANNULAR ABUTMENT MEMBER, SAID PORTION BEING PROVIDED WITH SLOTS EXTENDING TO THE UPPER EDGE THEREOF AND WHICH CONSTITUTE THE ENTRY SLOTS, THE UPPER PART INCLUDING PROTUBERANCES WHICH CONSTITUTE THE FOLLOWERS AND WHICH ARE ADAPTED TO BE SLID THROUGH THE ENTRY SLOTS TO REACH THE LOWER END OF THE FRUSTO-CONICAL PORTION, SAID PROTUBERANCES AND FRUSTOCONICAL PORTION BEING DIMENSIONED AND CONTOURED FOR THE FRUSTO-CONICAL PORTION TO CAM THE PROTUBRANCES SO AS TO PRESS THE LOWER EDGE OF THE UPPER PORTION AGAINST THE STEP, SAID LOWER EDGE CONSTITUTING THE OTHER ABUTMENT MEMBER.