Patent ID: 6174002
Filing Date: 2001-01-16
Classification: F16L

Abstract:
A tube coupling comprising:a coupling body;a separation prevention ring which is disposed in said coupling body to bite into the outer wall of a tube body fitted into the coupling body so to prevent said tube body from coming out; anda release ring which is disposed in said coupling body so to be movable in an axial direction within a predetermined range and releases the biting into said tube body by the separation prevention ring by pushing said separation prevention ring, wherein:said separation prevention ring comprises a ring portion in contact with a back ring disposed in said coupling body;pushing portions, which are radially formed in large number within said ring portion, have a circular shape and have grooves which extend from the outside of the ring portion to the inside, and are pushed by an inside end of said release ring; andprojections respectively formed at tips of said pushing portions and pulled out of the outer wall of said tube body when they are pushed by the inside end of said release ring in a state fitted in the outer wall of the tube body.