Patents by Inventor Donald C. Root

Donald C. Root 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).

  • Tandem sheave assembly, and method to install an elevator car having a tandem sheave
    Patent number: 5957243
    Abstract: A tandem sheave assembly for an elevator car includes a hitch plate having an aperture to permit variable positioning of the tandem sheave assembly. A method to install an elevator car includes the steps of: attaching the sheave frame to the car frame via a shaft engaged with the car frame and hitch plate; positioning the sheave frame by rotating the sheave frame about the shaft; and fastening the sheave frame into the desired position by inserting fasteners through the aperture in the hitch plate.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: September 28, 1999
    Assignee: Otis Elevator Company
    Inventors: Donald C. Root, Mario Uttaro