| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent slipping-out by fitting a connecting end part of an inner tube in an connecting end part of an outer tube having slits, arranging an engaging hole in either one of the outer tube or the inner tube of a fitting part, and arranging an engaging projection to engage with the engaging hole on the other inner tube or outer tube side. SOLUTION: An elastic piece 27b of an outer tube 27 sandwiched between two slits 31 possesses a rectangular engaging hole 33. While, an engaging projection 35 engageable with an engaging hole 33 at connecting time to the outer tube 27 is protrusively arranged outward on a peripheral wall of an inner tube 29. In the engaging projection 35, a fitting directional side inclined face is formed in a gentler cross-sectional almost chevron shape in an inclination than a slipping-out directional side inclined face, and the inner tube 29 can be easily inserted/fitted in a connecting end part 27a by such a structure. Since a required process is only to fasten the outer periphery of a fitting part by a fastening metal fitting after engaging the engaging projection 35 with the engaging hole 33, the engaging projection 35 prevents rotation of the inner tube 29 by engaging with the engaging hole 33, and can also reliably prevent slipping-out of the inner tube 29.</p> |
