| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that a pipe joint frequently loosens or falls off from a tapered part, adjustment of expansion pipes, fastening of screws, etc. are troublesome, and the number of components tends to be increased so that a manufacturing cost increases.SOLUTION: A concave groove (5) path is provided outside a male pipe in the three directions of a linear path (6), a rotation path (7), and a fixing path (8). A protrusion (13) corresponding to the shape of the concave groove path (5) is provided inside a female pipe. For the connection of the pipes, the protrusion (13) is inserted from the linear path (6) to the rotation path (7) to the fixing path (8) so that the pipes are in a locked state and the falling-off can be prevented entirely. Since there are no components required associated with the expansion pipes, the manufacturing cost can be substantially reduced. |
