Hopper and filter chamber for direct forward throw sweeper

  • US 5,303,448 A
  • Filed: 07/08/1992
  • Issued: 04/19/1994
  • Est. Priority Date: 07/08/1992
  • Status: Expired due to Term
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First Claim
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1. In a direct forward throw sweeper having a debris hopper which in normal sweeping position is directly ahead of and adjacent a main sweeping brush, an opening in the hopper which in normal sweeping position is adjacent and faces the brush, said opening being that through which debris is swept directly by the brush into the hopper and emptied out of the hopper, a vacuum fan arranged to pull an air stream from around the brush, into and through the hopper, then through an air filter in an air filter chamber above the hopper in normal sweeping position, and then to exhaust said air stream to atmosphere, said air filter chamber having space below the filter in normal sweeping position for the accumulation of dust removed from the air stream, the hopper having at least one lift arm connected thereto and at least one powered actuator connected to the lift arm, the lift arm and actuator being operable to raise the hopper to a selected elevated height, a door hinged to the hopper adjacent the brush and located to close the aforesaid opening, said door being hinged proximate the edge of the opening which is the upper edge when the hopper is in the normal sweeping position, characterized by resilient means for opening said door and at least one powered actuator acting in opposition to the resilient means for closing the door.

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