Patents by Inventor Calvin E. Johns

Calvin E. Johns 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).

  • Car and hoistway door coupling apparatus
    Patent number: 4457405
    Abstract: An apparatus is provided which couples a car door and a hall door in an elevator system. The apparatus includes a roller which is spring loaded into a first position for engaging a vane on the car door and which is movable from that first position for disengaging the vane if the vane is on the wrong side of the roller. The apparatus allows the car door to open and close the hall door by engaging this roller and, if the vane is on the wrong side of the roller, nevertheless, allows the car door to close.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: July 3, 1984
    Assignee: Otis Elevator Company
    Inventor: Calvin E. Johns