| 摘要 |
PROBLEM TO BE SOLVED: To easily and surely connect an end of a second tube to an end of a first tube. SOLUTION: An engagement groove 17 provided in an inner peripheral surface of the second tube 12 comprises a first groove part 17a extending in the longitudinal direction of the second tube 12 and a second groove part 17b extending from a terminal end of the first groove part 17a and bent in the circumferential direction. A bending inner face of a portion of the second groove part 17b continuous with at least the first groove part 17a is in a curved surface 17c. As a result, only by engaging an engagement projection 13 provided on an outer peripheral surface of the first tube with the first groove part 17a of the engagement groove 17 of the second tube 12 so as to rotate the first tube, the engagement projection 13 is smoothly guided into the second groove part 17b of the engagement groove 17 by the operation of the curved surface 17c so that the first and second tubes are connected to each other. Thus, even in case of performing connecting operation with fumbling at a portion where the connecting portion of the second tube is invisible, the first and second tubes can be connected to each other easily and surely. COPYRIGHT: (C)2007,JPO&INPIT
|
