| 摘要 |
PROBLEM TO BE SOLVED: To make mutually fitting force of pipe joints act on each other reliably when uniting the stick, and to distinguish the fitting force in the case of separating to provide the degree of freedom in separating or folding respective pipes. SOLUTION: A projecting joint 2 is provided with: a fixed part 21 fixed to the pipe; a circular cone part 22 extending conically having a top in an extending direction; and an engaged part 23 which protrudes outward in a radial direction in the state of a frame at a terminal end part. A recessed joint 3 has a conical inner surface part 32 fitting to the circular cone part 22 on the inner surface of a fixed part 31 fixed to the pipe and an engaging part 33 projecting so as to fit and engage the engaged part 23. A cylinder near the engaging part 33 has a plurality of slits 34 radially and at nearly regular intervals, and is formed flexibly in the radial direction. When the engaged part 23 enters or leaves with action of both of the joints in a uniting or separating direction, the engaging part 33 is curved outward in an omnidirectional radial direction and/or returned into its original state to perform engaging or disengaging action of the engaged part 23 to unite or separate both of the pipes 11a and 11b. COPYRIGHT: (C)2007,JPO&INPIT
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