| 摘要 |
PROBLEM TO BE SOLVED: To interjoin a coupling and a tube in a single operation only by inserting a flexible tube and to combine slip-off preventing ability and sealing ability between the coupling and the flexible tube with fire resistance of a seal part. SOLUTION: A taper surface 37 is formed on the inner peripheral of a press ring 25, an annular retainer 44 is arranged between the taper surface 37 and a collar 40, and press means 51 and 61 to effect alignment by pressing the retainer 44 against a taper surface 37 are provided. The retainer 44 is worked that when a flexible tube 1 is inserted, a protrusion part 45 is elastically and forcibly expanded through the crest part 4 of a corrugated pipe 2, and the protrusion part 45 is engaged with the root part 5 of the corrugated pipe 2 by the passage of the crest part 4. A sealant 21 for the internal part of a cylindrical body 11 performs sealing of the crest part 4 of the corrugated pipe 2, and at least a part thereof is formed of a fire resisting part 56. |
