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Vacuum cleaner having circuitous flow

  • US 4,884,315 A
  • Filed: 12/10/1987
  • Issued: 12/05/1989
  • Est. Priority Date: 12/10/1987
  • Status: Expired due to Fees
First Claim
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1. A closed circuit vacuum cleaning apparatus comprising,a nozzle housing having a cover portion and a wall portion downwardly depending from said cover portion, said wall portion having an interior surface and having a leading and a trailing end and opposed sides to form an enclosure having an open bottom,a downwardly extending baffle spaced apart from said internal surface of the wall portion along said leading and trailing end and said sides to define an air-recirculation duct therebetween, said baffle further defining an evacuation chamber surrounded by said air-recirculation duct,an evacuation port in said nozzle housing in fluid communication with said evacuation chamber,an exhaust port in said nozzle housing in fluid communication with said air-recirculation duct,conduit means for providing an imperforate fluid connection of said evacuation port with said exhaust port external of said nozzle housing, said conduit means including a filtration means for air filtration and particle collection, andvacuum means operatively associated with said conduit means for pressurizing air from said evacuation chamber to said air-recirculation duct via said filtration means.

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