Patent ID: 6851898

Claim:
A dust removal unit for an at least partially rotatable hand tool device ( 2 ) having a working axis (A) comprises a suction tube assembly including a suction tube ( 4 ) having an axis (B) radially offset from and parallel to said working axis (A), said suction tube ( 4 ) is telescopable to a limited axial extent, a suction head ( 3 ) encircling said working axis (A) and connected to a first end of said suction tube ( 4 ), said dust removal unit includes a depth stop ( 5 ) axially adjustable relative to said axis (B) of said suction tube ( 4 ), said suction tube ( 4 ) comprises a pleated bellows ( 6 ) extending axially along and encircling said axis (B) said suction tube assembly comprises a telescopable inner part ( 11 ) encircling said suction tube ( 4 ) and axially movable to a limited extent said inner part ( 11 ) has a substantially circular cross-section and an axially extending radially outer toothed surface member ( 12 ), with the toothed surface thereof facing radially outwardly and with said depth stop ( 5 ) axially displaceable along and lockable with the toothed surface member ( 12 ).