| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tubular structure allowing easy structure change such as the number of branches or the length, according to the number of structures to be connected. <P>SOLUTION: The tubular structure 4 is formed by connecting a plurality of tubular units 15. Each tubular unit includes a tubular main pipe part 17 with both ends opened, a circular insert end part 18 continuous to one end of the main pipe part, a reception end part 33 connected to the other end of the main pipe part, and a branch pipe part 40 branched from an intermediate part of the main pipe part. A projecting part 27 is formed on one of an outer circumferential surface of the insert end part and an inner peripheral surface of the reception end part, and a locking hole 37 larger than the projecting part is formed in the other. The insert end part of an arbitrary tubular unit is inserted in the reception end part of the other tubular unit. A space between the outer circumferential surface of the insert end part and the inner peripheral surface of the reception end part is sealed by a flexible seal member 30. The projecting part is freely fitted to the locking hole, and the insert end part is supported in a retractable and rotatable manner with respect to the reception end part so long as the projecting part is displaceable in the locking hole. <P>COPYRIGHT: (C)2012,JPO&INPIT |
