Asymmetric compact for drill bit
AssigneeBaker Hughes Incorporated
InventorsGreg Van Klompenburg, Brian A. Baker, Matthew R. Isbell
Life of this patent
Estimating the term…
Abstract
Asymmetrical compacts are utilized in certain places on roller cones of an earth boring bit to increase the number of compacts in certain rows. The compacts that are pressed into holes in rows on the cones. The compacts are of tungsten carbide and have a cutting end axis and a barrel axis. The barrel axis intersects the cutting end axis at an obtuse angle. In the heel row, the barrel axis of at least some of the compacts is rotated to have less inclination than the cutting end axis. In an adjacent row to the heel row, each of the compacts has a barrel axis that is rotated to have more inclination than its cutting end axis and more inclination than the barrel axes of the heel row.
Claims26
An earth boring bit, comprising:
- a bit body, having at least one depending bit leg;
- a rotatable cone mounted to the leg;
- a plurality of rows of compacts on the cone, each of the compacts having a barrel that is interferingly pressed into a mating hole in the cone and a cutting end that protrudes from the cone;
- and
- at least some of the compacts having a cutting end axis that extends at an obtuse angle relative to a barrel axis.
An earth boring bit, comprising:
- a bit body, having at least one depending bit leg;
- a rotatable cone mounted to the leg, the cone having a gage surface that joins a heel area;
- a plurality of asymmetrical compacts in a heel row on the heel area of the cone, each of the asymmetrical compacts having a barrel that is interferingly pressed into a mating hole in the cone and a cutting end that protrudes from the cone;
- and
- each of the asymmetrical compacts in the heel row having a cutting end axis and a barrel axis, the cutting end axis of at least some of the asymmetrical compacts being at a greater angle relative to a vertical axis than the barrel axis.
An earth boring bit, comprising:
- a bit body having three depending bit legs;
- rotatable first, second and third cones mounted to the legs, each of the cones having a gage surface that joins a heel area;
- a plurality of heel row compacts in a heel row on the heel area of the first cone;
- a plurality of adjacent row compacts in the first cone located radially inward and next to the heel row compacts;
- each of the heel row and adjacent row compacts in the first cone having a barrel that is interferingly pressed into a mating hole in the first cone and a cutting end that protrudes from the first cone;
- each of the heel row compacts of the first cone having a cutting end axis that extends radially outward relative to a barrel axis;
- and
- each of the adjacent row compacts of the first cone having a cutting end axis that extends radially inward relative to a barrel axis.
A compact for an earth boring bit, comprising:
- a cylindrical barrel having a longitudinal axis and a bottom that is perpendicular to the longitudinal axis;
- and
- a generally dome-shaped cutting end extending from the barrel, the cutting end and the barrel having a junction that is located in a plane that is skewed relative to the bottom.
Dependencies are inferred from the claim text.