Pointed diamond working ends on a shear bit
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United States of America Patent
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Jan 7, 2014
Grant Date -
Feb 14, 2008
app pub date -
Jul 27, 2007
filing date -
Aug 11, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
In one aspect of the present invention, a drill string has a drill bit with a body intermediate a shank and a working face. The working face has a plurality of blades converging at a center of the working surface and diverging towards a gauge of the working face. At least one blade has a cutting element with a carbide substrate bonded to a diamond working end with a pointed geometry. The diamond working end also has a central axis which intersects an apex of the pointed geometry. The axis is oriented between a 25 and 85 degree positive rake angle.
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