Patents by Inventor Joseph H. Kelly, Jr.

Joseph H. Kelly, 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).

  • Rock bit with rigid face seals and recessed energizers
    Patent number: 4923020
    Abstract: An improved mechanical face seal for rock bits using rigid rings and energizers placed in recesses or grooves in the cutter and bearing shaft. The minimum diameter of the shaft groove is substantially equal to the relaxed inside diameter of the shaft energizer and the maximum diameter of the cutter recess is substantially equal to the relaxed outside diameter of the cutter energizer. The radii at the inner end of the shaft groove and the outer end of the cone groove conform to the relaxed cross-section of their respective energizers. The mean diameter of the shaft energizer is substantially equal to the cone journal diameter and the product of the mean diameter and cross-sectional diameter is the same for both energizers.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: May 8, 1990
    Assignee: Hughes Tool Company
    Inventors: Joseph H. Kelly, Jr., Michael F. Welsh