| 摘要 |
PROBLEM TO BE SOLVED: To provide sprinkler unwinding piping which reduces the number of components while dispensing with a sleeve member and a pulling-off preventing ring. SOLUTION: A first and a second expanded diameter thread parts 2a, 2b of which outer diameters are larger than the inner diameter of a rotation nipple 5 and are smaller than the tip root diameter of a tapered external thread 7 of the rotation nipple 5 are formed by crushing a first thread part 2a and a second thread part 2b of a most tip of a flexible pipe 4. A rear surface side of the second expanded diameter thread part 2b is made to abut on the tip surface 5a of the rotation nipple 5. Rubber seal rings 10, 11 are fitted in a first root 3a and a second root 3b of the flexible pipe 4, respectively. Moreover, aligning rings 12, 13 are fitted in a third root 3c arranged on the flexible pipe tip side of the first root 2a and a fourth root 3d arranged on the flexible pipe rear side of the second root 2b, respectively. COPYRIGHT: (C)2011,JPO&INPIT
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