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VACUUM CLEANING APPARATUS TO REMOVE INDUSTRIAL WASTE FROM MACHINERY

  • US 3,628,213 A
  • Filed: 10/13/1969
  • Issued: 12/21/1971
  • Est. Priority Date: 10/13/1969
  • Status: Expired due to Term
First Claim
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1. In a vacuum cleaning apparatus for applying a vacuum by a vacuum pump to an accumulation of waste to suck said waste into an inlet of a piping system having therein waste receiving means for collecting said waste and having a first piping section providing communication between said inlet and said waste receiving means and a second piping section providing communication between said waste receiving means and said pump, the improvement comprising in combination a one-way check valve between said inlet and said waste receiving means for preventing backflow of air from said waste receiving means to a substantial portion of said first piping section adjacent said inlet but permitting free flow of air in an opposite direction, a vacuuM cutoff valve in said second piping section for intermittently cutting off said pump from said waste receiving means during an unloading operation, means for automatically opening said waste receiving means to the atmosphere to release vacuum in said waste receiving means when said cutoff valve is closed but not when said cutoff valve is open, said waste receiving means having a waste removing door and means for automatically opening said door when said cutoff valve is closed and said vacuum is released and for automatically closing said door when said cutoff valve is opened.

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