Patent ID: 7458130

Claim:
A closed loop vacuum cleaner for cleaning a floor surface comprising: a managing unit containing a handle and support wheels; a foot portion supported by said managing unit and containing an expanded chamber therein, said foot portion further including an intake nozzle and an outlet nozzle directed toward said chamber, the cross section of said outlet nozzle being larger than the cross section of said intake nozzle, thereby increasing the velocity of air at said intake nozzle while decreasing the velocity of air at said outlet nozzle; a motor driven fan for creating air flow, said motor driven fan being supported by one of said foot portion and managing unit and being connected to said intake nozzle and said outlet nozzle to form a closed loop air system with said expanded chamber; means within said closed loop air system for filtering dirt and pollutants from the air within the system; and a universal joint between said foot portion and said managing unit to thereby allow said foot portion to float above the floor surface being cleaned.