Patent ID: 6896299

Claim:
A pipe joint made of resin, comprising: a sleeve inner ring which is to be pressingly inserted into one end portion of a pipe member to be integrated with said pipe member under a state where a projected tip end portion of said sleeve inner ring protrudes outwardly in an axial direction from one end portion of said pipe member, said tip end portion of said sleeve inner ring being engaged by said pipe member; a joint body in which a cylindrical receiving port is formed in one end portion, an insertion portion of said pipe member into which said sleeve inner ring is pressingly inserted, being inserted into said receiving port; and a pressing ring which is to be screwed to said one end portion of said joint body, presses an outer side of said pipe member by means of screw advancement toward said one end portion of said joint body, to cause said projected tip end portion of said sleeve inner ring to abut against an inner area of said receiving port of said joint body, and said pipe member to abut against a surface of said sleeve inner ring, thereby forming sealing portions, wherein: said sleeve inner ring defines an outer, axially extending surface and said receiving port defines an inner, axially extending surface, both said outer, axially extending surface and said inner, axially extending surface define a gap between them for at least part of the axially extending length of said axially extending surfaces, such that only said outer, axially extending surface engages a corresponding surface of the pipe member to thereby reduce the width of the gap and said inner, axially extending surface does not engage the pipe member, an inner radial face of said projected tip end portion of said outer, axially extending surface of said sleeve inner ring is formed as a conical tapered face in which a diameter is larger when further moving toward an outer side in the axial direction of said sleeve inner ring, a cylindrical groove is formed in an inner area of said receiving port of said joint body, said projected tip end portion of said sleeve inner ring including said conical tapered face being fitted in the axial direction in said cylindrical groove, and said cylindrical groove cooperates with said conical tapered face to form a secondary sealing portion, and with a place on a side of an outer radial face of said projected tip end portion to form a primary sealing portion, the inclination angle of said conical tapered face of said projected tip end portion of said sleeve inner ring with respect to the axis is set to 5 to 20°, and a cylindrical portion which abuts against an inner peripheral face of a cylindrical portion on an inner radial side of said cylindrical groove of said joint body is formed integrally with an inner radial side of said projected tip end portion of said sleeve inner ring, an outer peripheral face of said cylindrical portion abutting against said inner peripheral face of said cylindrical portion on said inner radial side to form a tertiary sealing portion.