To provide a separation preventive device capable of surely preventing a fluid pipe from being separated, and capable of exerting a force for preventing a fluid pipe from being separated in various directions, while preventing its outer surface from being corroded and its inner surface from being damaged.
A separation preventive device 3 of a fluid pipe includes: a separation prevention body 5 that is outwardly fitted to an outer circumferential surface of a fluid pipe 1 and includes recesses 4 extending in the circumferential direction on the inner peripheral surface; a plurality of arched claws 6 accommodated respectively within the recesses 4 at the tip end of the inner circumferential surface side, and having blade parts 6b capable of biting into the outer circumferential surface of the fluid pipe 1; and pressing means 7 that presses the outer circumferential end 6c of the arched claw 6 so that the blade part 6b bites into the outer circumferential surface of the fluid pipe 1. The blade part 6b includes a first blade part 61 that extends in the circumferential direction of the fluid pipe 1 and in the pipe axial direction and is formed in an approximately spiral shape, and a second blade part 62 that extends in a direction different from that of the first blade part 61 and is also formed in an approximately spiral shape. The first blade part 61 and the second blade part 62 are alternately disposed in the circumferential direction of the fluid pipe 1.
Hideo Shimizu
Yuichi Takagi
Ryoichi Mizobuchi
Masayuki Ogura
Hideki Akiba
Taeko Katata
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