| 摘要 |
PROBLEM TO BE SOLVED: To enable fitting of piping members with ease and sufficient connection strength by dislocating pipe axes of the piping members having different measurements in inner and outer diameters at a fitting portion, and rotating one piping member in its circumferential direction in the state that the outer peripheral wall of the piping member is in contact with the inner peripheral wall of the other. SOLUTION: A pipe 1 is served as one piping member. The other is a joint 2a which has an inner diameter a little larger than an outer diameter of the end of the pipe 1, a number of projected lines 21 formed on an outer peripheral wall in teeth-like form with equal pitches parallely to an axis of the pipe, a weight 22 fixed to one part of the outer peripheral wall, and a specific gravity dislocated from the pipe axis to the side of the weight 22. The ends of the pipe 1 are fitted to both sides of the joint 2a. A gear 31 on a leading end of a driving shaft 3 is meshed with the projected line 21 of the joint 2a which is then rotated in a circumferential direction around the pipe axis. At the fitted portion, the outer peripheral wall of the pipe 1 and an inner peripheral wall of the joint 2a are softened by frictional heat therebetween and deposited to each other. |
