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
System and method for providing an extended platform for an operating system
Autonomous adaptation of transmit power
Battery structures and related methods
Light-emitting device with a spacer at bottom surface
Endotracheal tube
System and method for providing advice to consumer regarding a payment transaction
System for non-destructive image processing
  Randomly Featured Patents
Method for designing application specific integrated circuits
Snap-on tie with slider simulating windsor knot
Compensation circuit for current peaking reduction in notification appliances
Adaptive and interactive scene illumination
Radiation photographic apparatus
Charge coupled device ripple adder with nearly instantaneous carry propagation
Stagger feed control circuit
Method of manufacturing fine-grained copper substrate for optical information carrier
Canopy for a lighting fixture
Process for the preparation of block copolymers for tire tread compositions, and these copolymers