Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Method of and apparatus for laser drilling holes with improved taper
Measuring device and measuring method that use pulsed electromagnetic wave
Authentication for social networking messages
Charging member, electrophotographic apparatus, and process cartridge
Color variation control process for molding plastic and composite multi-color articles
Method for controlled layer transfer
Isothermal amplification of DNA
  Randomly Featured Patents
Acidic bleaching solution, method of preparation and a bleaching system for forming the same
FM tuner having adaptive bandpass filter for adjacent channel interference
Method of programming a multilevel nonvolatile memory cell with reduced number of erase operations
Process and system for the asynchronous measurement of signal courses
Chimney lining former and compactor
Mail item feed device
Slip spool and method of using same
Cinch
Seal insert ring for roller cone bits
Coping and profile cutting and/or sanding apparatus