Patents by Inventor Robert L. Leiner

Robert L. Leiner 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).

  • Elevator door operator having a variable pitch lead screw
    Patent number: 4454931
    Abstract: An elevator door operator includes a motor which drives a worm gear. This worm gear controls the motion of a block which contains retractable members that engage rollers on the hall door, and which engage a block which is connected to the car door. When the car doors are fully closed, these members are fully retracted.
    Type: Grant
    Filed: April 8, 1983
    Date of Patent: June 19, 1984
    Assignee: Otis Elevator Company
    Inventors: Robert L. Leiner, John K. Salmon
  • Elevator door operator
    Patent number: 4410067
    Abstract: An elevator door operator includes a motor which drives a worm gear. This worm gear controls the motion of a block which contains retractable members that engage rollers on the hall door, and which engage a block which is connected to the car door. When the car doors are fully closed, these members are fully retracted.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: October 18, 1983
    Assignee: Otis Elevator Company
    Inventors: Robert L. Leiner, John K. Salmon