Patents by Inventor J. Warren Barkell, Jr.

J. Warren Barkell, Jr. 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).

  • Patent number: 4926974
    Abstract: An elevator car having a clutch pivotally carried by a car door and biased to an operative position in which drive rollers of an adjacent hatch door may be engaged by "open" and "close" vanes. A first parallelogram linkage operates the close vane in direct response to car door position, in a direction opposite to initial car door opening movement. A second parallelogram linkage, associated with the open vane, is operated when the open vane contacts a hatch door roller at the start of door opening, to unlock the car door by retracting a plunger from an opening in the car door sill. The car door clutch bias may be manually overcome by authorized maintenance personnel, to disengage the car door from a hatch door.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: May 22, 1990
    Assignee: Inventio AG
    Inventors: Arnold M. Morris, Daphne D'Zurko, Richard H. Pilsbury, J. Warren Barkell, Jr., Karl B. Orndorff, Lawson Randall S.