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Means for emptying a filter box

  • US 5,254,146 A
  • Filed: 12/28/1992
  • Issued: 10/19/1993
  • Est. Priority Date: 12/28/1992
  • Status: Expired due to Term
First Claim
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1. In a surface maintenance machine having a vacuumized dust control system, an air filter in a filter box, means for moving said filter box between an operating position wherein dust and debris accumulate in the bottom of the box and a tilted position wherein accumulated dust and debris are emptied out of the box, said filter box being provided with an opening in one of its walls through which dust and debris may be emptied when the box is moved to said tilted position, characterized by a gravity operated closure which covers said opening when the filter box is in its operating position and uncovers said opening when said filter box is in its tilted position, said gravity operated closure having a weight attached thereto and positioned offset from the center of gravity of the closure.

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