Patents Assigned to Martin Marietta Materials Southwest, Ltd.
  • Patent number: 6886473
    Abstract: A rail car door closer is provided and includes a movable base having a rotatable member rotationally disposed thereon. The movable base is coupled to a drive system configured to translate the movable base along a rail or a track disposed adjacent a railroad track rail. A device is also provided to permit securement of the rotatable member in a substantially upright position. When the rotatable member is in the substantially upright position, it is positioned vertically to contact an open rail car door and, upon movement of the movable base to a position adjacent and beneath the open rail car door, the rotatable member contacts the open rail car door and subsequently moves the open rail car door in correspondence with a movement of the movable base.
    Type: Grant
    Filed: August 28, 2003
    Date of Patent: May 3, 2005
    Assignee: Martin Marietta Materials Southwest, Ltd.
    Inventors: David P. Marchiori, Melvin Gary Clark
  • Publication number: 20040040462
    Abstract: A rail car door closer is provided and includes a movable base having a rotatable member rotationally disposed thereon. The movable base is coupled to a drive system configured to translate the movable base along a rail or a track disposed adjacent a railroad track rail. A device is also provided to permit securement of the rotatable member in a substantially upright position. When the rotatable member is in the substantially upright position, it is positioned vertically to contact an open rail car door and, upon movement of the movable base to a position adjacent and beneath the open rail car door, the rotatable member contacts the open rail car door and subsequently moves the open rail car door in correspondence with a movement of the movable base.
    Type: Application
    Filed: August 28, 2003
    Publication date: March 4, 2004
    Applicant: MARTIN MARIETTA MATERIALS SOUTHWEST, LTD
    Inventors: David P. Marchiori, Melvin Gray Clark