Patents Assigned to Otis Elevator Corporation
  • Method and apparatus for reducing elevator service calls
    Patent number: 4623040
    Abstract: A method and apparatus for reducing unnecessary elevator service calls by cycling open and shut a nonresponsive car's door, is disclosed. The doors are cycled in the presence of car demand and indications the car door is shut but the hoistway door is ajar. The doors are cycled only after these conditions persist for a selected period.
    Type: Grant
    Filed: March 4, 1985
    Date of Patent: November 18, 1986
    Assignee: Otis Elevator Corporation
    Inventors: Robert E. Hall, Charles Whynacht