DRILLING CONE ROCK BIT Russian patent published in 2010 - IPC E21B10/16 

FIELD: construction.

SUBSTANCE: invention relates to rock-breaking tool, namely to drilling cone rock bits, mostly of low diametre. Drilling triple cone rock bit includes legs with inclined journals and cutters installed on them by means of locking bearing with hard-alloy teeth, between which there are grooves arranged on cutter body. Grooves are arranged on incoming side of teeth at the distance -s, which is identified through mathematical formula. Besides axes of teeth and axes of grooves symmetry at peripheral collars are arranged in single plane passing perpendicularly to axis of cutter, and at the collars of the main cone, line that connects axis of groove symmetry with axis of tooth arranged behind, forms angle γ determined through mathematical expression with plane passing perpendicularly to axis of cutter. At the same time axis of grooves symmetry is displaced relative to plane passing through axes of teeth in according collar towards bit axis.

EFFECT: improved reliability of teeth fixation, which results in improved drilling and mechanical speed of drilling.

2 cl, 5 dwg