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Filtering device

  • US 4,345,353 A
  • Filed: 11/24/1980
  • Issued: 08/24/1982
  • Est. Priority Date: 07/23/1979
  • Status: Expired due to Term
First Claim
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1. A sweeper comprising a body structure, a plurality of wheels supporting said body structure, and a sweeper housing, said body structure including a hopper, a vacuum pump and a dust filter, said hopper serving to store debris picked up by said sweeper, said vacuum pump serving to draw a partial vacuum in said sweeper housing thereby providing a moving airstream, said dust filter being disposed in said airstream to remove dust particles from said airstream, said dust filter comprising a filter housing, a pleated planar filter medium, support means for said filter medium and a striker mechanism for removing accumulated dust from said filter medium, said striker mechanism including at least one strap, said strap having a first end secured with respect to said filter housing, said strap having a second end which is free to move with respect to said filter housing and filter medium, said second end carrying at least one hammer, said strap and hammer overlying the upper edges of the pleated filter medium, and an oscillator supported on said strap intermediate said first and second ends for imparting movement to said strap and hammer to impart shock to said filter medium thereby removing dust accumulation.

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