| 摘要 |
<p>The plug for a cement bolt (18) is set in a bore (12) with a wider conical section (16). It has swiveling locking components (22a, 22b) which are spread by a spring-loaded cone (30). The end of this and the inner surfaces of the locking components are roughened to prevent sliding. An independent claim is included for a similar plug in which the surfaces are ribbed.</p> |
