Resources Contact Us Home
Rolling cone bit with elements fanned along the gage curve

Image Number 6 for United States Patent #6651758.

An earth-boring bit for drilling a borehole comprises a bit body having a bit axis, at least two rolling cone cutters rotatably mounted on the bit body, a plurality of inner row cutter elements positioned on at least one cone cutter in a first inner row, a plurality of gage-cutting cutter elements positioned in a first fanned-gage row on a first one of the one cutters, and a plurality of gage-cutting cutter elements positioned in a second fanned-gage row on a second one of the one cutters, wherein the gage-cutting cutter elements on the bit define a gage curve and cutter elements in the first fanned-gage row and the second fanned-gage row contact the gage curve at different points. In one embodiment, each cutter element has an extension, and the extensions of the uppermost fanned-gage row cutter element and the first inner row cutter element define a step distance such that the ratio of the step distance to the extension of the first inner row cutter element is greater than 0.5. Alternatively, the first and second fanned-gage rows are positioned to have different oversize angles, positioned such that the ratio of the diameter of the largest fanned-gage row cutter element to the diameter of the first inner row cutter elements is not greater than 0.75, or positioned such that the lowermost fanned-gage row contains more cutter elements than any other fanned-gage row.

  Recently Added Patents
Bullet lens design for the dasal seeker
Spread spectrum communication system and transmission power control method therefor
Performance monitoring of advanced process control systems
Display screen with graphical user interface
Device and method including a soldering process
Wound dressing with a discontinuous contact layer surface
Control apparatus and control method
  Randomly Featured Patents
Hydraulic brake booster
Method of producing thermally shrinkable and electromagnetic wave proof tubes and product thereof
6-heterocyclic imidazo[1,2-.alpha.]pyridine-2-carboxamide derivatives, preparation and therapeutic use thereof
Shellfish opening tool
Elimination of stabilizer for high nitrile resins by using a latex dewatering extruder for product recovery
Satellite signal reception device, timekeeping device with a satellite signal reception device, and satellite signal reception method
Writing utensil
Method and apparatus for treating particulate material
Belt adjuster
Ceiling fan