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Revolving cutters for rock bits

  • US 4,751,972 A
  • Filed: 04/15/1987
  • Issued: 06/21/1988
  • Est. Priority Date: 03/13/1986
  • Status: Expired due to Term
First Claim
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1. A rotary drag bit for drilling wells, comprising:

  • a bit body rotatable about a central axis adapted to be secured to a drill column, said bit body having a face opposite to the drill column connection; and

    a plurality of insert cutters mounted in said face along respective radial lines emanating from said central axis and on respective circumferences of said central axis, each insert cutter comprising;

    a mounting block of high strength material with a bearing mounted through its face at the end opposite the end mounted in the face of the bit body, an axis of said bearing is skewed at an angle to its radial line in the plane of the bit body face; and

    a diamond cutter element with journal means mounted for rotation in said bearing, said cutter element having a plurality of diamond cutting segments embedded in its circumference.

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