Patent ID: 6922009

Claim:
An electric lamp equipped with: a blown-glass lamp vessel ( 1 ) having an axis ( 2 ) and, around said axis ( 2 ), an end portion ( 3 ) with an end ( 4 ) where the lamp vessel ( 1 ) and a stem ( 5 ) extending in the lamp vessel ( 1 ) are fused together, which end portion ( 3 ) has indentations ( 6 ) at a distance from the end ( 4 ), which indentations extend transversely to the axis ( 2 ); an electric element ( 7 ) in the lamp vessel ( 1 ), which electric element is connected to current conductors ( 8 , 9 ) which issue from the lamp vessel ( 1 ) to the exterior via the stem ( 5 ); a lamp cap ( 20 ) with electric contacts ( 21 ), a metal shell portion ( 22 ) which is undulated so as to form screw thread, and a base portion ( 23 ) with at least one of the electric contacts ( 21 ), the shell portion ( 22 ) being present around the end portion ( 3 ) and the base portion extending transversely to the axis ( 2 ), and the current conductors ( 8 , 9 ) each being connected to a respective one of the electric contacts ( 21 ); a coupling member ( 30 ) provided with cams ( 31 ) in the lamp cap ( 20 ), which cams ( 31 ) engage in a respective indentation ( 6 ), and which coupling member ( 30 ) is secured to the lamp cap ( 20 ), characterized in that the coupling member ( 30 ) is a plastic synthetic resin body having a central portion ( 32 ) transverse to the axis ( 2 ), and arms ( 33 ) which are distributed around the axis ( 2 ) and extend from the central portion ( 32 ) in the axial direction, which each support at an inner surface ( 34 ) a respective one of the cams ( 31 ), and which have an undulatory profile at an outer surface ( 35 ), which undulatory profile is in engagement with the screw thread of the lamp cap ( 20 ).