Patent ID: 7954856

Claim:
A bite type pipe coupling structure characterized by: a joint main body having a pipe coupling port into which a coupling pipe is inserted; a tubular bite type sleeve fitted to an outer circumference of the coupling pipe; and a fastening member fastened to the joint main body so as to press the bite type sleeve toward the inside of the joint main body, wherein an outer circumferential surface of the bite type sleeve is a tapered outer circumferential surface, the diameter of which decreases toward the inside of the joint main body, wherein a guide tapered surface, the diameter of which increases toward the fastening member, is provided in a portion of the pipe coupling port that is adjacent to the fastening member, and the bite type sleeve can contact the guide tapered surface, wherein the guide tapered surface has a small diameter portion for guiding a distal end portion of the bite type sleeve to bite into the coupling pipe and a large diameter portion for sealing the tapered outer circumferential surface of the bite type sleeve by making close contact with the tapered outer circumferential surface, wherein a tilt angle of the small diameter portion relative to a central axis of the guide tapered surface is greater than that of the large diameter portion relative to the central axis, and wherein the bite type sleeve is formed integrally with the joint main body and is separated from the joint main body by an axial pressing force from the fastening member.