Patent ID: 8857012

Claim:
A robot cleaner comprising: a suction hole to suction dust; a blower to generate a suction force to suction the dust; dust collector to receive the dust through the suction hole; and a rotating brush to sweep up and collect the dust into the dust collector, wherein the dust collector includes a collecting region to receive the dust swept up by the rotating brush, and a backflow preventing member movably coupled at an inlet opening of the collecting region between an open position and a closed position, wherein the backflow preventing member is pivotably rotatable in an air suction direction by the suction force of the blower to the open position to suction the dust into the dust collector and is adapted to return to the closed position to prevent the dust in the dust collector from being discharged through the suction hole upon stoppage of the blower, wherein the backflow preventing member includes one end hingedly coupled to upper portion of the inlet opening, and the other end configured as a free end, and wherein the backflow preventing member is kept in an inclined state with respect to a vertical direction in the closed position such that the other end is contacted with an inner surface of the collecting region and supported by the inner surface of the collecting region.