Patents by Inventor David N. Cantrell

David N. Cantrell 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).

  • Test stand and method of testing the tracking characteristics of a crawler tractor
    Patent number: 4773261
    Abstract: A test structure and a method for measuring speeds of rotary drive members on opposite sides of a track laying tractor so as to correct potential mis-tracking on the tractor. The test structure includes a mechanical drive simulating ground coupling between tracks in a tractor. Provided in the drive is a variable resistance that simulates the load on the tractor due to its own weight and characteristics. Readings of the speeds of the rotary drive member are made to determine whether the difference between the speeds fall within or outside of acceptable limits.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: September 27, 1988
    Assignee: Deere & Company
    Inventor: David N. Cantrell