Patents Assigned to Douglas McFarland
  • Variable force traction enhance systems
    Patent number: 5784867
    Abstract: The present invention provides variable force traction enhance systems for vehicles. The systems include one or more hydraulic cylinders connected to an implement and fluidly connected to one or more hydrostatic transmissions. The hydraulic cylinders actuate the implement in response to changes in the hydraulic fluid pressures in the hydrostatic transmissions. The actuated implement automatically shifts weight to vehicle drive wheels to improve traction and automatically prevents a rear end of the vehicle from bucking.
    Type: Grant
    Filed: October 3, 1995
    Date of Patent: July 28, 1998
    Assignees: Shivvers Incorporated, Douglas McFarland
    Inventors: Douglas McFarland, Donald H. Parkes