| 摘要 |
<p>A blocking element (3) that acts as a seal, disposed between a hose (@) and a rigid internal core (4), comprising two flanges, or suchlike, joined together, with being open in the centre for enclosing a hose. Each flange comprises a radially outer portion (19)-that is substantially inextensible, and further radially inner portion (20) - formed by a plurality of teeth 21. The radially inner and outer portions, can either be in a single piece, or else, in distinct parts one from the other (53, 57). The element passes from an at-rest condition to the one of closing the hose around the core - when the two inextensible portions are subjected to opposed axial thrusts.</p> |
