Abstract: A chamfering device incorporating a power tool for driving a rotary bur or the like provided with an elongated shaft and a cutting head, wherein the shaft is enclosed at a small clearance by a first, mainly tubular member, which, after mounting of the shaft with the said first member fitted thereto in the power tool, is held in position by a second, mainly tubular member, which is fixed to the power tool and is connected to the first member thereby arresting this in position, a third, mainly tubular member being provided over the second member, said third member being displaceable in the axial direction of the second member and lockable in occupied positions, said third member being an adjustable extension of the second member.

Abstract: A power driven vehicle for disabled, particularly for children, and which incorportaes a motor driven chassis module, a seat module and an accumulator module, wherein the chassis module incorporates two wheel pair units, which are disconnectable from each other and constitute a first, front wheel unit and a second, rear wheel unit, one of the wheel pair units, preferably the first wheel unit, incorporating two steering and driving units acting individually upon one wheel each, the second wheel unit being composed by a central beam, one end of which is connectable to the first wheel unit and having at its other end a yoke pivotably supported transversely to the longitudinal direction of the vehicle, and having at its free ends wheels supported in bearings, and said seat module being centrally arranged on the beam, whereas said accumulator module is attached on both sides of the beam, between the pairs of wheels.