| 摘要 |
<p>It comprises diametrically opposed cams (11.1, 11.2), for bearing on the inner surface of a tube, wedges (11.3, 11.4) arranged at the extremities of the cams (11.1, 11.2) and means (18) for bringing the wedges together (11.3, 11.4) in order to apply the cams (11.1, 11.2) against the inner surface of the tube. <IMAGE></p> |
