Patent ID: 6678912
Filing Date: 2004-01-20
Classification: E01H

Abstract:
A sweeping unit, comprising:a carrying frame including supporting wheels; at least one motor-driven rotary brush mounted in said carrying frame such that said rotary brush can be rotated about a longitudinal axis thereof; an adjusting unit for adjusting a vertical distance of the supporting wheels from the longitudinal axis of the rotary brush, the adjusting unit comprising at least one adjusting element and a control apparatus; and a sensor which senses at least one of a driving torque of the rotary brush, a driving power of the rotary brush, and a physical variable indicative of the driving torque and driving power, and generates a corresponding sensor signal which is fed to the control apparatus, the control apparatus determining an operating position of the adjusting element, said operating position corresponding to an optimum sweeping-level width, as a function of a ground-contact position of the adjusting element, said ground-contact position being recognized during lowering of the rotary brush by an abrupt rise of the sensor signal.