Patents by Inventor Simon J. Langford

Simon J. Langford 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).

  • Four wheel steering vehicle with valve position retaining means
    Patent number: 5139105
    Abstract: A vehicle has at least two pairs of ground engaging wheels, which vehicle can alternatively be steered with two or four wheels, the vehicle comprising a chassis having first and second pairs of ground engaging wheels which are movable to effect steering of the vehicle, the wheels of each pair being mounted at opposite sides of the chassis and the second pair of wheels being lockable in a position such that simple steering is effected solely by the first pair of wheels, the first pair of wheels being movable to effect steering by a first fluid actuator to which fluid is fed from a steering valve, and the second pair of wheels being movable by a second fluid actuator to which fluid is fed via a steering mode selector valve from the steering valve means, the steering mode selector valve having a first operating condition when fluid from the steering valve is not fed to the second fluid actuator whereby simple steering is effected solely by the first pair of wheels and a second operating condition wherein fluid f
    Type: Grant
    Filed: January 24, 1991
    Date of Patent: August 18, 1992
    Assignee: J. C. Bamford Excavators Limited
    Inventors: Roger A. Frost, Robert J. Andrew, Simon J. Langford