Patents by Inventor Earl W. Cramton

Earl W. Cramton 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).

  • Skid-steered tractor vehicle combined steering lever and auxiliary control with self-centering mechanism
    Patent number: 4090411
    Abstract: A skid-steered tractor vehicle is driven by right and left hydrostatic transmissions having separate steering levers, one for each transmission. A centering device acting directly on the transmission controls is longitudinally shiftable against the force of a spring in response to pivotal movement of either steering lever from a neutral or idle position for returning the steering lever upon release.Also, there is a second pivotal mounting for one or both steering levers in a plane at right angles to the pivot axis of the levers for controlling auxiliary functions without interfering with the steering movements of the levers.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: May 23, 1978
    Assignee: Clark Equipment Company
    Inventors: Larry E. Albright, James J. Bauer, Earl W. Cramton
  • Skid-steered tractor vehicle combined steering lever and auxiliary control with self-centering mechanism
    Patent number: 4043416
    Abstract: A skid-steered tractor vehicle is driven by right and left hydrostatic transmissions having separate steering levers, one for each transmission. A centering device acting directly on the transmission controls is longitudinally shiftable against the force of a spring in response to pivotal movement of either steering lever from a neutral or idle position for returning the steering lever upon release. Also, there is a second pivotal mounting for one or both steering levers in a plane at right angles to the pivot axis of the levers for controlling auxiliary functions without interfering with the steering movements of the levers.
    Type: Grant
    Filed: November 26, 1975
    Date of Patent: August 23, 1977
    Assignee: Clark Equipment Company
    Inventors: Larry E. Albright, James J. Bauer, Earl W. Cramton