Patent ID: 7716784

Claim:
A suction port assembly comprising: a casing comprising a suction port which draws in dust from a surface being cleaned; a drum brush which is disposed rotatably in the casing, the drum brush having a plurality of bristles on an external surface arranged to shake off dust from the surface being cleaned; and a rib which is disposed at a position close to the drum brush and is mounted in the casing so that one end is in contact with the plurality of bristles, and the rib being configured to detach the dust from the plurality of bristles when the drum brush rotates, wherein the plurality of bristles are arranged on the drum brush at an angle of inclination relative to a radial direction, and the bristles enter the rib with an obtuse angle so as to receive friction power from the rib, and the friction power prevents the drum brush from rotating when the suction port assembly is pulled towards a user.