Patents by Inventor Harley E. Kroll

Harley E. Kroll has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4377017
    Abstract: A scrubber is disclosed including an applicator for applying a cleaning solution, a rotary brush for working such solution on the soiled surface and a pick up section for removing the cleaning solution and suspended soilage from the surface being scrubbed. The scrubber includes a dirty solution chamber and a clean solution chamber. A separator is provided between such chambers to separate the dirty water into a sludge portion which is returned to the dirty water chamber and a clean solution portion which is fed into the second chamber.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: March 22, 1983
    Assignee: Tennant Company
    Inventors: Ferdinand J. Herpers, Harley E. Kroll, Alfred D. Carlson, Paul D. Dodge
  • Patent number: 4310944
    Abstract: A 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.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: January 19, 1982
    Assignee: Tennant Company
    Inventors: Harley E. Kroll, Donald L. Thomsen
  • Patent number: 4295244
    Abstract: A scrubber is disclosed including an applicator for applying a cleaning solution, a rotary brush for working such solution on the soiled surface and a pick up section for removing the cleaning solution and suspended soilage from the surface being scrubbed. The scrubber includes a dirty solution chamber and a clean solution chamber. A separator is provided between such chambers to separate the dirty water into a sludge portion which is returned to the dirty water chamber and a clean solution portion which is fed into the second chamber.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: October 20, 1981
    Assignee: Tennant Company
    Inventors: Ferdinand J. Herpers, Harley E. Kroll, Alfred D. Carlson, Paul D. Dodge
  • Patent number: 4206530
    Abstract: A 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.
    Type: Grant
    Filed: January 30, 1978
    Date of Patent: June 10, 1980
    Assignee: Tennant Company
    Inventors: Harley E. Kroll, Donald L. Thomsen
  • Patent number: 4194263
    Abstract: A scrubber is disclosed including an applicator for applying a cleaning solution, a rotary brush for working such solution on the soiled surface and a pick up section for removing the cleaning solution and suspended soilage from the surface being scrubbed. The scrubber includes a dirty solution chamber and a clean solution chamber. A separator is provided between such chambers to separate the dirty water into a sludge portion which is returned to the dirty water chamber and a clean solution portion which is fed into the second chamber.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: March 25, 1980
    Assignee: Tennant Company
    Inventors: Ferdinand J. Herpers, Harley E. Kroll, Alfred D. Carlson, Paul D. Dodge