Patent ID: 6513839
Filing Date: 2003-02-04
Classification: F16L,Y10S

Abstract:
A pipe joint made of resin and defining an axial direction, said pipe joint comprising:a sleeve-like inner ring in which an inner periphery for movement of a fluid is formed, a bulge portion is formed on an outer periphery in one end portion in an axial direction, which is to be pressingly inserted into one end portion of a pipe member made of resin to increase a diameter of a peripheral wall of said pipe member in a place corresponding to the bulge portion, thereby forming an outer peripheral sealing face for forming a sealing portion and an outer peripheral face is formed inwardly of said bulge portion which extends into a straight shape in the axial direction; a joint body including a cylindrical pipe receiving port formed in one end portion in said axial direction, into which an insertion portion of said pipe member, formed by pressing insertion of said inner ring, is to be inserted, and an inclined sealing face that elongates in a direction intersecting an axis and that, in accordance with insertion of said insertion portion, abuts against said outer peripheral sealing face to form a sealing portion formed on an inlet of said pipe receiving port; and a cap nut-like pressing ring in which a cylindrical portion that is to be screwed to an outer periphery of said pipe receiving port of said joint body, and an annular pressing portion that elongates toward an axial center from one end portion in the axial direction of said cylindrical portion and that externally presses said pipe member made of resin are continuously integrated with each other, said inner ring being pressed from an outer side of said pipe member by said annular pressing portion as a result of screw advancement of said pressing ring toward said joint body, whereby said pipe member is prevented from slipping off and a sealing force is provided, wherein: an inner peripheral face of said annular pressing portion of said pressing ring includes a pressing edge at an inner end of said inner peripheral face said inner peripheral face being formed in said axial direction into a straight shape of the same diameter as that of said pressing edge and of the same diameter as said outer peripheral face of said sleeve-like inner ring; and an inner diameter of said annular pressing portion of said pressing ring is 1.0 to 1.1 times an outer diameter of said pipe member made of resin.