Abstract: The invention relates to a floor-care appliance with automatically adjusting vertical position of the brush-body rotary shaft. The shaft is placed in rotation via a drive belt from a motor, which shaft is borne by a rocker which is swingable as a function of the load on the brushes and is acted on in brush application position, and, in order to obtain a simplified construction with optimally constant work output, the rocker is swingable by the tension of the drive belt and has a deflection point which, from below, deflects the bottom-side pulling course of the drive belt.

Abstract: A floor maintenance machine includes a machine housing, a treating tool mounted on the machine housing for positional adjustment toward and away from the surface to be treated as considered in the operative position of the machine, an electric motor having a housing and an output shaft, and a transmission interposed between the output shaft of the motor and the treating tool and operative for transmitting torque therebetween. The motor housing is mounted on the machine housing for angular displacement in a range delimited by abutments on these housings about the axis of the output shaft and carries an eccentrically situated pin which is received in a slot of an adjusting lever which is rigid with a frame on which the treating tool is mounted, so that the tool is lifted when the torque increases and lowered when the torque decreases. A section of the machine housing is transparent and markings provided on the periphery of the motor housing are visible therethrough.