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
RF power amplifier circuit with mismatch tolerance
Automated security analysis for federated relationship
Double patterning method using tilt-angle deposition
Method and system for reciprocal mixing cancellation of wideband modulated blockers
Layout design defect repair based on inverse lithography and traditional optical proximity correction
Distributed IPv6 neighbor discovery for large datacenter switching systems
Hydrating lounge chair
  Randomly Featured Patents
Fuel injection pump and snubber valve assembly
Finger manipulated oral hygiene device
Method of making an air preheater rotor
Acyloxy silane treatments for metals
Method and apparatus for producing and displaying spectrally-multiplexed images of three-dimensional imagery for use in stereoscopic viewing thereof
SAS-based semiconductor storage device memory disk unit
Reversal preventive device
Insect screening sheet
Electronic apparatus and method of controlling same
Bow-hunters horn rattling apparatus