Sweeper with recirculation hood and independent filter system Patent #: 4006511
ApplicationNo. 05/873226 filed on 01/30/1978
US Classes:15/346, Closed circuit systems, i.e., air recirculating15/340.1, Power propelled vehicle or carrier15/340.3, Including brush15/349With receiver for dirt from rotary or moving agitator
ExaminersPrimary: Moore, Christopher K.
Attorney, Agent or Firm
International ClassesA47L 9/10 (20060101)
E01H 1/00 (20060101)
E01H 1/08 (20060101)
AbstractA powered sweeping machine is disclosed, particularly suitable for efficiently removing light and heavy weight litter from surfaces such as parking lots, warehouse floors and the like. The machine includes a main frame carrying a hopper and a powered brush. The brush operates through an opening in the lower side of a brush housing. The hopper is separated into a debris receiving compartment and a filter compartment. An air fan and an associated duct recirculates air from the far end of the debris compartment to a zone adjacent the brush. This nonfiltered air is discharged into the brush housing and again moved through the debris compartment to aid in moving debris to the far end of the debris compartment. A fan is provided for withdrawing a portion of the air from the filter compartment and discharging the air to the ambient atmosphere. The withdrawal of a portion of the air results in more air flowing into the brush housing than is recirculated through the brush housing and thus provides dust control at the base of the brush housing.