Patents Assigned to Rock Bit Industries, Inc.
  • Rock bit with improved shank protection
    Patent number: 5074367
    Abstract: An improved rotary rock bit is described having a plurality of wear resistant inserts protruding along the leading edge of the bearing segment shanks. These inserts break up large chunks of formation which protrude inward from the borehole wall while drilling fractured or broken hard formations. Thereby protecting the bit from damage and excessive erosion often incurred while drilling hard fractured and broken formations.
    Type: Grant
    Filed: May 11, 1990
    Date of Patent: December 24, 1991
    Assignee: Rock Bit Industries, Inc.
    Inventor: Roy D. Estes