ROCK DRILL BIT Russian patent published in 2014 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: drill bit comprises legs with inclined pins shifted in plan and cutters with milled or cast teeth and flushing assemblies. Cutter rims subjected to axial and radial slippage have skewed teeth. Note here that skewed teeth at every rim are inclined to pin axis so that their lateral surfaces are located at 90°±40° to direction of the vector of tooth summed speed of sliding over the face. Rims subjected to axial slippage only can have both straight tooth with working surfaces located at 90°±10° to cutter axis and skewed teeth similar to one of adjacent rims.

EFFECT: higher efficiency, lower power input at drilling, accelerated drilling.

4 dwg