Patent ID: 7631394

Claim:
A suction brush for a vacuum cleaner, comprising: an upper casing; a lower casing fixedly coupled to the upper casing and having a suction port, formed thereon, for drawing in dust and other foreign materials existing on a surface to be cleaned; an elevating plate installed between the upper casing and the lower casing so as to ascend and descend against the lower casing and having a lever insertion part formed thereon; a cleaned surface sensing part for sensing whether the surface to be cleaned is a hard floor or a carpet; a lever rotatably provided around a rotating shaft that is parallel to the elevating plate, one end of the lever being inserted into the lever insertion part and pressing the elevating plate downward when the lever is rotated in one direction, while one end of the lever seceding from the lever insertion part when the lever is rotated in the other direction; and a solenoid for rotating the lever in one direction when it is sensed that the surface to be cleaned is the hard floor and rotating the lever in the other direction when it is sensed that the surface to be cleaned is the carpet; wherein the lower casing becomes in contact with the surface to be cleaned as the elevating plate is descending, while it comes apart from the surface to be cleaned as the elevating plate is ascending.