| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable the mechanical strength of a folded part of a pipe to be fully exhibited. <P>SOLUTION: Gripping surfaces 36 are formed in the shape of U in cross section to grip a surface 37 to be gripped of a second joint 35 at connecting ends 33 of a pair of first joints 30. The gripping surfaces 36 of the first joint 30 and the surface 37 to be gripped of the second joint 35 are each formed radially from the center at a constant pitch and are formed in meshing surfaces 50 which can be meshed with each other. While the gripping surfaces 36 of the first joint 30 and the surface 37 to be gripped of the second joint 35 are meshed with a desired angle, the second joint 35 is gripped between the one pair of first joints 30. Each of the first joint 30 and the second joint 35 is inserted into either a vertical protruding part 6 or a first horizontal protruding part 7, so that the second joint 35 can be fixed to the first joint 30 in a state where a predetermined angle is maintained. <P>COPYRIGHT: (C)2012,JPO&INPIT |
