Patents by Inventor Harm Sligter

Harm Sligter 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: 4183198
    Abstract: A raking device with a forward elongated rectangular or trapezoidal frame has coupling points that can be coupled to the three-point lift of a tractor. Two groups of rake wheels are pivoted to the frame and obliquely arranged in V formation, the point of the V being open and at the rear with respect to the direction of travel. The frame and beam members are normally positioned above the axles of rotation of the wheels so that windows will not be disturbed until engaged by the rake wheels and moved to the center of the device. Each group of rake wheels can be adjusted along the length of the elongated frame and a further rake wheel can be attached to the rear of either group of wheels. Each group of wheels preferably includes two pairs of rake wheels that are mounted on respective yokes journalled to a respective group beam that is pivoted to the frame and spring suspended. The device can be operated at high speeds and the rake wheels can match ground irregularities.
    Type: Grant
    Filed: February 24, 1978
    Date of Patent: January 15, 1980
    Assignee: Lely Pacific
    Inventor: Harm Sligter