| 摘要 |
<p>An open ended cylindrical drill attachment 21 for attachment on a drill bit 16 to collect dust while drilling. The drill attachment having an inner structure formed of a plurality vanes 22 extending from inner walls to slightly offset of the centre, to form a central channel for receiving the drill bit 16 and providing at least partial engagement so as to rotate the drill attachment 21 and provide a vortex-like suction action and centrifugal entrapment. The drill attachment 21 also acts as a drilled hole depth limiter.</p> |
