Patent ID: 6928690

Claim:
A vacuum cleaner comprising: a main body having a fan motor generating a driving force therein, a fan, and a cyclone dust collector; a suction head connected to the main body for sucking in all kinds of impurities existing on a surface that is to be cleaned; a suction hose connected to a front portion of the main body and an extension tube connected to the suction head such that both are disposed between the main body and the suction head; a dust collecting chamber detachably fixed on a rear side of the main body and having a handle on an outer rear surface thereof; a lower holding part of the handle on the dust collecting chamber projecting past wheels affixed to the main body where the lower holding part contacts a surface of a lower step when the front portion of the main body of the vacuum cleaner secures to an upper step; and a roller caster disposed on both sides of a lower front portion of the main body allowing back-and-forth rolling motions and rotations on a flat surface and securing the vacuum cleaner to the edge of the upper steps, thereby preventing the main body of the vacuum cleaner from slipping down a stairway.