US Patent 7200892 Robot cleaner with adjustable brush

A robot cleaner with a pivotable brush which pivots in accordance with a condition of a floor surface to be cleaned. The pivotal brush prevents overload to a suction motor caused by excessive contact of the brush with the floor surface to be cleaned. The robot cleaner includes a robot cleaner body with a hinge receiving portion, a brush frame with a hinge protrusion pivotally connected to the hinge receiving portion, and a suction port sealingly connected with the dust suction portion of the robot cleaner body. A brush cover is detachable from the brush frame via a brush cover locking mechanism. A rotatable brush is rotatably disposed between the brush frame and the brush cover.