Patents by Inventor David J. Roldness

David J. Roldness 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).

  • Patent number: 4324189
    Abstract: A locking mechanism disposed on one of the panels of foldable doors utilized in railway cars for transporting vehicles for automatically connecting the panels together when in a collapsed position.
    Type: Grant
    Filed: March 17, 1980
    Date of Patent: April 13, 1982
    Assignee: Pullman Incorporated
    Inventor: David J. Roldness
  • Patent number: 4318649
    Abstract: An automatic locking mechanism is provided for latching the swingable "B" deck of an auto-rack railway car in either an upper raised position or a lower horizontal position. A spring biased plunger or bolt is normally positioned in locking engagement with a depending striker plate on the end of the swingable deck portion and may be withdrawn by the operator and rotated to a release position in which it is held out of engagement with the striker plate to permit the deck portion to be raised to its upper position. As the deck portion is raised a lug on the striker plate engages a transversely extending rotator pin on the end of the plunger and rotates the plunger away from its release position so that the plunger is automatically returned to a locking position beneath the bottom edge of the striker plate when the "B" deck portion is moved to its raised position.To return the deck portion to a horizontal position, the plunger is withdrawn by the operator and rotated to the release position.
    Type: Grant
    Filed: April 16, 1980
    Date of Patent: March 9, 1982
    Assignee: Pullman Incorporated
    Inventors: David J. Roldness, Jerry L. Archambeault, Robert L. Barkhimer
  • Patent number: 4287833
    Abstract: A railway car for carrying autos includes a loading end having lower folding and an upper swinging door which is actuated from the lower platform of the car. The upper and lower doors are opened and closed independently to provide a complete closure for loading end.
    Type: Grant
    Filed: September 19, 1979
    Date of Patent: September 8, 1981
    Assignee: Pullman Incorporated
    Inventors: David J. Roldness, Felixberto A. Galasan, Thomas H. Watson
  • Patent number: 4248557
    Abstract: An operating mechanism for a hinged deck portion of a vehicle-carrying auto-rack railway car utilizing a first-class lever to counterbalance the deck end portion. A spring load is provided by a Belleville spring pack of novel, compact construction which has a substantially constant spring-force versus deflection curve such that manual manipulation of the hinged deck by operating personnel is facilitated during loading and unloading of the auto-rack car.
    Type: Grant
    Filed: March 1, 1979
    Date of Patent: February 3, 1981
    Assignee: Pullman Incorporated
    Inventors: David J. Roldness, Thomas H. Watson, Gary D. Wonacott