| 摘要 |
<p>A tube body is smoothly inserted and maintained not to slip out for sure only by inserting the same. While a tip surface (B2) of a tube body (B) butts against a projection part (3a) of a sleeve (3), a sliding surface (3b) of the sleeve (3) is pushed along a tapered surface (2a) in an inserting direction (N) of the tube body (B). At the same time, the projection part (3a) radially expands, and the tip surface (B2) of the tube body (B) comes off the projection part (3a). As a result, the sliding surface (3b) is forcibly pushed by an elastic member (4) along the tapered surface (2a) in a direction (U) opposite to the inserting direction (N). At the same time, the sleeve (3) radially contracts at once and the projection part (3a) cuts into an outer surface (B3) of the tube body (B). Accordingly, the tube body (B) is maintained within an outer periphery (1a) of a nipple (1) so as not to move in the inserting direction (N) and the opposite direction (U).</p> |
