Patents by Inventor John R. Thornton

John R. Thornton 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).

  • Collet attachment/closer
    Patent number: 5431416
    Abstract: A collet attachment apparatus for a lathe machine tool including a collet holder for engagement of a spring collet, a nose collet adapter chuck to be fastened to a standard master chuck for engagement of a collet holder. A rear spindle draw tube adapter fastens to a hydraulic actuator to cause axial movement of a drawbar and exert or release pressure on the spring collet. Various lock ring means are utilized to limit the axial movement of the drawbar and ultimately the pressure on the collet.
    Type: Grant
    Filed: October 29, 1993
    Date of Patent: July 11, 1995
    Inventor: John R. Thornton