Receptacle for e.g. glass tube of discharge lamp, has lip formed by deformation of end of ferrule of female part for retaining lip on thread of male part, where free diameter of lip is lesser than outer diameter of thread

摘要

The receptacle has a male part (20), and a female part (22) screwed down on the male part. A lip (34) is formed by deformation of an end of a ferrule (30) of the female part for retaining the lip on a thread (27) of the male part. The male part has a body that is smooth on a part of its length near its one end, and the thread is upstream of another end (28) of conical form. The female part has an inner conical end (36), of conjugated profile to that of the conical end of the male part. The free diameter of the lip is lesser than outer diameter of the thread (27).