| 摘要 |
<p>Rivet sleeve 1 has a succession of annularly-shaped recesses 1d of of saw- tooth configuration which engage with a sharp edged rim 2b of an expansion body to prevent loosening. The rivet is used, for example to fasten insulating material 5 to a wall 6, and the force applied to the stem 2 when the rivet is expanded is sufficient to break the stem at a predetermined breaking point 3. <IMAGE></p> |
