Dust protection unit, for e.g. electric hand tool, comprises dust trap or barrier, with microcrystalline surface of raised areas and depressions of specified size/spacing

摘要

A dust protection unit, comprises a dust trap (5) or barrier (7) where the dust particles stick to the top of the trap or barrier. The surface has a synthetic microcrystalline structure with raised areas and depressions in the region 5-100 mu m. The raised areas and depressions have a spacing of between 5 and 200 mu m.