Patent ID: 7941896

Claim:
An upright vacuum cleaner, comprising: a cleaner body; a suction port assembly hinged to the cleaner body, and including a drum brush rotatably mounted on a front lower surface thereof, and a pair of main wheels, wherein at least one main wheel is disposed on each side of a rear portion of the suction port assembly; and; a height adjusting apparatus configured to be in an active mode or an inactive mode and including: an actuating portion partially disposed in the cleaner body; and a pair of supporters each having one end that supports the actuating portion and another end connected to a shaft of one of the main wheels of the suction port assembly; the actuating portion including a pair of knobs extending from within the cleaner body into the suction port assembly and each knob slidably coupled to one of the pair of supporters, respectively, wherein in the active mode, the knobs are set to a first position in which ends of the knobs are aligned with the supporters such that the height adjusting apparatus raises the rear portion of the suction port assembly from an initial height, in which the drum brush is spaced from a surface being cleaned, to bring the drum brush into contact with the surface when the cleaner body tilts from an upright position towards the rear of the suction port assembly, and the height adjusting apparatus lowers the rear portion of the suction port assembly to the initial height when the cleaner body returns to the upright position, and in the inactive mode, the knobs are set to a second position in which ends of the knobs extend past the supporters such that the rear portion of the suction port assembly remains at the initial height when the cleaner body tilts from the upright position towards the rear of the suction port assembly.