| 摘要 |
PURPOSE:To mold an enlarged socket which is excellent in thickness, precision and the like and is most suitable for especially joint for sewer piping and so on, by enlarging a resin pipe and pressing it from both sides by means of a core mold and thickness-increasing sleeve which are specially constructed. CONSTITUTION:A resin pipe 1', which is softened by heating, is inserted in such a manner that sheathes a guide sleeve 15, and is stopped at the end of a fixed cylinder 9. Subsequently the sleeve 15 is moved backward, a diameter-enlarging drum 13 is moved forward, and then a divided core mold 12 is pushed forward. A diameter of the resin pipe 1' is thus enlarged to form a socket. A thickness- increasing sleeve 16 is pushed in a core mold in such a condition as described above, and socket-molding resin is filled in a cavity and simultaneously the resin pipe 1' is pushed in again in the inserting direction. And thus, the reduction in thickness at a rising-up part of the socket can be eliminated. EFFECT:Since a slope is not formed when enlarging a diameter, no triangular groove is made when inserting a pipe, and choking of any solid object can be prevented. |
