Patent ID: 9615716
Date: 2017-04-11
CPC Classifications: A47L

Claim:
1. An automatic cleaning device, comprising: a main body; and an operating unit, disposed on the lower side of the main body and including three disc-shaped wheels, each of the wheels being driven for rotation about a generally vertical axis and including a cleaning surface on a bottom surface thereof facing the underlying surface to be cleaned, characterized in that two of the three wheels are tilted downward with respect to the main body such that the bottom surface of the two wheels and the plane defined by each of the two wheels is tilted with respect to the underlying surface being cleaned as well as the axes of rotation of the two wheels being tilted with respect to the vertical; the other of the three wheels is oriented such that the bottom surface thereof is generally parallel or horizontal relative to the underlying surface being cleaned and the axis of rotation thereof is non-tilted and aligned with the vertical, wherein a cleaning unit is provide on each wheel, and friction between the cleaning unit and a floor causes the automatic cleaning device to move around.