| 摘要 |
PURPOSE: To carry out the fusion connection without using a clamping device, by installing a spread diameter opened port part which is opened at the end part and has the larger diameter than that of a pipe receiving port inner peripheral part, at the end part of a coupling body and installing a slid-off preventing member hooked on the inner surface of the spread diameter opened port part and the outer surface of a connecting resin pipe, in the spread diameter opened port part. CONSTITUTION: The coupling body 10 of an electrofusion coupling 1 is made of thermoplastic resin, and an electric heating wire 20 is wound at the inner peripheral part. A spread diameter opened port part 13 which is opened on the end part side and has the larger diameter than the inside diameter of a pipe receiving port 11 is formed on the inlet side inner peripheral surface of the pipe receiving port 11 of the coupling body 10 and a nearly annular slip-off preventing member 30 is installed in the spread diameter opened port part 13. The slip-off preventing member 30 is made of the resin having the high hardness or metal, and is formed to an annular form having the hooking parts 32 and 33 on the outer and inner peripheral sides and a cut split groove 31 on the circumference, Accordingly, when the resin pipe 40 is inserted into the receiving port 11, the hooking parts 32 and 33 bite on the inner surface of the spread diameter opened port part 13 arid the outer surface of the resin pipe 40, and the slip-off of the resin pipe 40 is prevented. |
