Patents by Inventor Garrett R. Tienstra

Garrett R. Tienstra 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: 4729571
    Abstract: The so-called spinner hitch is a centrally apertured quadrangle member adapted to be pivotally secured between spaced mounting frame members by a rod projecting through apertures in the frame members and through the central aperture through the quadrangle member. The quadrangle member has four spaced angularly related platforms to receive thrust transmitting balls of different sizes, or spaced apertured members to receive therebetween thrust transmitting clevises. The mounting frame members have locking blocks secured to their inside surfaces to engage the horizontal and vertical surfaces of the quadrangle member that is spaced oppositely from the thrust transmitting platform that is transmitting the load to restrain the quadrangle member from shifting angularly as forward or reverse thrust is exerted on the torque transmitting member by the pulling vehicle.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: March 8, 1988
    Inventor: Garrett R. Tienstra