Patents by Inventor Alan Rangeley Dean

Alan Rangeley Dean 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).

  • Agricultural tractor with draft load sensing springs for power lift control
    Patent number: 4059159
    Abstract: A tractor has a power lift mechanism controllable automatically in known manner by implement draft load sensing apparatus. This apparatus comprises two leaf springs which are spaced apart in a lateral direction relative to the tractor, the springs being connected at their front ends to the tractor and being adapted to flex in the lateral direction but being stiff longitudinally of the tractor and vertically; two hitch links each connected to the rear end of one of the springs; and equipment for transmitting to the power lift mechanism a control signal derived from any variation in the distance between the flexible portions of the springs.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: November 22, 1977
    Assignee: David Brown Tractors Limited
    Inventors: Stephen Moorhouse, Harry Horsfall, Alan Rangeley Dean