| 摘要 |
<p>Glass perforating device intended to be fixed to an electric drilling machine (15), comprised of a non-cutting hollow cylinder (3) presenting longitudinal grooves (2) on the vertical wall; this cylinder is internally provided with a sweeping device (9) intended to rub against the surface of the part to be pierced and to project the abrasive mix against the inner wall of the cylinder. The device can be used with a guide-support template (12) for the cylindrical bit (1) in order to avoid dispersing the abrasive mix during the drilling operation.</p> |
