Patent ID: 6951439

Claim:
A dust collection unit suitable for use with a hand held drilling and/or hammering tool, comprising: a shroud ( 34 ) adapted to extend around a tool or bit ( 24 ) of such a hammering and/or drilling tool so as to collect dust in an airflow passing through the dust extraction unit which dust is generated by such a tool or bit; and a tube like extension sleeve ( 28 ) which extends forwardly from the shroud, with respect to such a tool or bit; and characterised in that a slideable sleeve ( 54 ) is slideably mounted on the extension sleeve so as to move between a retracted position in which the forward rim of the extension sleeve is engageable with a surface to be worked and an extended position in which a forward rim of the slideable sleeve is engageable with a surface to be worked and the forward ends of the extension sleeve and the slideable sleeve are shaped differently from each other so as to fit against a different shape of work surface.