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A dust collection unit suitable for use with a hand held drilling and/or hammering tool, comprising a shroud (34) which is 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 shroud which dust is generated by su

A dust collection unit suitable for use with a hand held drilling and/or hammering tool, comprising a shroud (34) which is 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 shroud which dust is generated by such a tool or bit. A tube like extension sleeve (28) extends forwardly from the shroud, with respect to such a tool or bit, which extension sleeve (28) is tapered at its forward end so as to have a forward rim which fits into a corner of a surface to be worked. A slideable sleeve (54) is slideably mounted on the extension sleeve so as to move between a retracted position in which the tapered forward rim of the extension sleeve (28) is engageable with a corner surface to be worked and an extended position in which a forward rim of the slideable sleeve (54) is engageable with a surface to be worked.

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1. 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 generat

1. 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.2. A dust collection unit according to claim 1 wherein the extension sleeve is tapered at its forward end so as to have a forward rim which fits into a corner of a surface to be worked.3. A dust collection unit according to claim 2 wherein the tapered forward rim is formed to have a pair of opposing V-shaped ridges (52).4. A dust collection unit according to claim 2 or claim 3 wherein the slideable sleeve has a forward rim which extends perpendicularly to the longitudinal axis of such a tool or bit so as to fit against a plane surface to be worked.5. A dust collection unit according to claim 1 wherein the tube like extension sleeve and the slideable sleeve are formed as an adapter (22) which can be releasably fitted to the shroud.6. A dust collection unit according to claim 1 wherein the sliding sleeve is slideably mounted around the extension sleeve.7. A dust collection unit according to claim 1 wherein the sliding sleeve is biased into its extended position by a spring arrangement (62).8. A dust collection unit according to claim 1 further comprising an extension arm (36) on which the shroud (32) can be mounted, a filter housing (41) which communicates with the shroud via the extension arm and incorporates a filter, arranged such that the dust collecting airflow passes from the shroud, through the extension arm, into the filter housing and through the filter.9. A dust collection unit according to claim 8 wherein the dust collection unit (40) includes a fan (51) for generating the dust collecting airflow.10. A shroud adapter suitable for fitment to a dust collecting shroud (34) of a dust collection unit (40) which dust collection unit is suitable for use with a hand held drilling and/or hammering tool, the shroud adapter comprising a tube like extension sleeve (28) which can be releaseably fitted to said shroud so as to extend forwardly from said shroud, 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.11. An adapter according to claim 10 wherein the extension sleeve is tapered at its forward end so as to have a forward rim which fits into a corner of a surface to be worked.12. An adapter according to claim 11 wherein the tapered forward rim is formed to have a pair of opposing V-shaped ridges (52).13. An adapter according to any one of claim 11 or claim 12 wherein the slideable sleeve has a forward rim which is shaped to fit against a plane surface to be worked.14. An adapter according to claim 10 wherein the sliding sleeve is slideably mounted around the extension sleeve.15. An adapter according to claim 10 wherein the sliding sleeve is biased into its extended position by a spring arrangement (62).16. A shroud for a dust collection unit (40), which dust collection unit is suitable for use with a hand held drilling and/or hammering tool, which shroud can be releasably fitted to such a dust extraction unit so as 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 shroud which dust is generated by such a tool or bit, the shroud additionally comprising a forwardly extending tube like extension sleeve (28), 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.17. A shroud according to claim 16 wherein the extension sleeve is tapered at its forward end so as to have a forward rim which fits into a corner of a surface to be worked.18. A shroud according to claim 17 wherein the tapered forward rim is formed to have a pair of opposing V-shaped ridges (52).19. A shroud unit according to claim 17 or 18 wherein the slideable sleeve has a forward rim which extends perpendicularly to the longitudinal axis of such a tool or bit so as to fit against a plane surface to be worked.20. A shroud accordingly to claim 16 wherein the sliding sleeve is slideably mounted around the extension sleeve.21. A shroud according to claim 16 wherein the sliding sleeve is biased into its extended position by a spring arrangement (62).