Patents by Inventor Mark F. Welter

Mark F. Welter 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).

  • Locking mechanism for an elevator car door
    Patent number: 4491200
    Abstract: An apparatus for preventing the car door section of an elevator car from being opened when the elevator car is not located at an authorized landing zone in the elevator shaft. A car door locking device includes a locking mechanism connected to and movable with the car door section. The locking mechanism has a first member, a second member, and apparatus for connecting the second member for limited guided movement with respect to the first member between a locked position and an unlocked position. A spring is provided for normally urging the second member toward the locked position with respect to the first member. A first stop is attached to and movable with the second member. A second stop, fixed in position with respect to the car door section, is provided for selectively engaging the movable stop.
    Type: Grant
    Filed: August 11, 1982
    Date of Patent: January 1, 1985
    Assignee: Schlindler Haughton Elevator Corp.
    Inventors: William I. Thompson, Mark F. Welter, Dean L. Jodry