Patents by Inventor Petrus D. Prins

Petrus D. Prins 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).

  • Bogie steering system
    Patent number: 4998483
    Abstract: A bogie unit including at least one wheeled axle pivotally movable about a central vertical axis, a drawbar pivotally secured to a pivot point, and a control device connected to the axle and engaged with the drawbar, the control device being movable, at least to a limited extent, relatively to the drawbar, and permitting pivotal movement of the axle, at least to a limited extent, relatively to the drawbar.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: March 12, 1991
    Assignee: Goldfieds Engineering (Proprietary) Limited
    Inventor: Petrus D. Prins
  • Hopper
    Patent number: 4740130
    Abstract: A bottom discharge hopper the body of which is elevated at a tip by ramps so that doors on the underside of the body, which are secured thereto by links and which are pivotally fixed to upstanding structure on the chassis, open outwardly and downwardly to permit material discharge from the body.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: April 26, 1988
    Assignee: Peter Redvers Thorburn
    Inventor: Petrus D. Prins
  • Rail vehicle assembly
    Patent number: 4471700
    Abstract: A rail vehicle assembly comprises two vehicles each with single wheelsets, and a third vehicle, also with a single wheelset, which serves to interconnect the first two vehicles and which in use exerts a steering action on the first two vehicles. The third vehicle is located between the first two vehicles and is pivotally connected thereto in such a way that the three vehicles can align themselves with the rail track, while negotiating a curve, so that all the wheelsets are maintained at all times substantially on radial lines of the curve.
    Type: Grant
    Filed: November 25, 1981
    Date of Patent: September 18, 1984
    Inventor: Petrus D. Prins