| 摘要 |
In order to ensure, merely by inserting the pipe body, that a pipe body can be inserted smoothly and cannot be removed, a sliding surface (3b) of a sleeve (3) is pressed along a tapered surface (2a) in the insertion direction (N) of the pipe body (B) when the tip surface (B2) of the pipe body (B) collides with a protruding part (3a) of the sleeve (3), and as a result the diameter of the protruding part (3a) increases, and the tip surface (B2) of the pipe body (B) detaches from the protruding part (3a). Therefore, the sliding surface (3b) is pressed forcefully along the tapered surface (2a) in the opposite direction (U) with respect to the insertion direction (N) by an elastic member (4), and as a result the shape of the sleeve (3) changes immediately such that the diameter of the sleeve decreases, and the protruding part (3a) bites into the outer surface (B3) of the pipe body (B), and the pipe body (B) is held between the protruding part and the outer circumferential surface (1a) of a nipple (1), and is incapable of moving in the opposite direction (U) with respect to the insertion direction (N). |
