SWIVEL COUPLING AND MEYHOD FOR ATTACHING A SWIVEL NUT TO A TAIL PIECE

摘要

A swivel coupling used to connect metal tubes to externally threaded fittin gs in hydraulic systems includes a swivel nut which is attached to a tail piece by deforming a collar portion of the swivel nut into a locking relationship wit h the tail piece. This is accomplished by having facing and aligned shoulders on the swivel nut and on the tail piece which prevent the swivel nut from axially disengaging from the tail piece when the swivel nut is rotated to thread onto the threaded fittin g. The tail piece has a flat end face which engages a flat end face on the fitting so th at a leak-proof joint is formed between the tube and the fitting. The nut include s a frusto-conical portion that is engaged by a frusto-conical die surface on a split die ring in order to cam the collar portion toward the tail piece and align the respecti ve shoulders thereof.