Patent ID: RE39584

Claim:
A pipe joint made of resin, including a joint body defining an inside area, an inner ring, and a pushing ring, an end portion of a pipe being adapted for insertion in said inside area of said joint body, the end portion of the pipe being pressed by said pushing ring against said joint body in said inside area of said joint body, thereby connecting the pipe to said joint body, wherein: said joint body has a cylindrical receiving port disposed on an end portion thereof; said joint body further has a cylindrical portion protruding from an end portion thereof and inside of the said cylindrical receiving port concentrically therewith, said cylindrical receiving port and said cylindrical portion defining an annular groove between them; said inner ring is sleeve-shaped and has a connecting portion and a protruding portion, said inner ring being insertable in the said receiving port, such that said connecting portion is forcedly inserted in the end portion of the pipe so as to be connected to the pipe, said protruding portion protruding from the end portion of the pipe and in said receiving port when said connecting portion is connected to the end of the pipe; said protruding portion has an annular outer projection and an annular inner projection both axially protruding therefrom, said annular outer projection being inserted in said annular groove on the outside of said cylindrical portion by inserting said protruding portion of said inner ring in said receiving port, said annular inner projection being inserted on the inside of said cylindrical portion by inserting said protruding portion of said inner ring in said receiving port, said annular outer projection and said annular inner projection defining an annular recessed portion disposed between said annular outer projection and said annular inner projection; and said pushing ring has a pressing portion disposed thereon and is threadedly connected to said cylindrical receiving port, said pressing portion having an integral, axially outwardly extending cylindrical protruding piece made of resin for receiving and engaging, said pushing ring applying a pressing force with said pressing portion for pressing against said inner ring when said inner ring is connected to the end portion of the pipe and said cylindrical protruding portion is inserted in said receiving port, and when said pushing ring is threadedly connected to said receiving port.