Patents by Inventor James A. Graham, Jr.

James A. Graham, 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: 5049113
    Abstract: A compact, reliable lightweight variable diameter drive mechanism for use with either a belt or a chain comprising outwardly biased, frusto-conical axially movable pulley halves and an automatically adjustable, flexible contacting surface wrapped around the pulley axle. The contacting surface is capable of imparting significant amounts of traction to the belt or the chain riding on the pulley halves. The contacting surface automatically varies its circumference as the pulley diameter changes. Tension on the flexible contacting surface is maintained by retracting one end into the hub of the pulley as the pulley halves are axially adjusted.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: September 17, 1991
    Inventor: James A. Graham, Jr.