Patents by Inventor Wilford Hammarlund

Wilford Hammarlund 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: 4516639
    Abstract: A powered landscape rake for fine grading of and for stone and debris removal from a landscape surface is shown according to the teachings of the present invention. The rake of the present invention includes a drum rotatably mounted in a drum frame. The drum frame is mounted to a turntable assembly for allowing the drum frame to pivot about an axis generally perpendicular to the drum frame and which is located generally midway of the drum frame. A frame member is attached to the turntable and extends to a point under the tractor frame in front of the front wheels. The free end of the frame member is mounted for pivoting and swiveling to a frame attachment member. First and second cylinders are further attached to the turntable for positioning the drum frame at any desired angle in a vertical plane to the landscape and allow the drum frame to sway in a horizontal plane about the front frame attachment point.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: May 14, 1985
    Inventors: Kenneth Hammarlund, Wilford Hammarlund