| 摘要 |
<p>Dust and debris is removed by a chamber (1) around a drill at the drilled surface during the drilling operation. The chamber (1) is a one-piece plastics moulding having an open end (3) for application to the surface, an opposite closed end (4) with a central aperture (5) through which the drill can be inserted, and a side outlet nozzle (8) which can be connected to a suction unit e.g. a vacuum cleaner via a flexible hose (10). The aperture is provided by a sleeve (6) surrounding the drill and optionally the drill chuck. Sleeve liners may be used for different drills. The chamber may be transparent with alignment markings for drilling. <IMAGE></p> |
