HYBRID DRILLING BIT WITH HIGH SIDE FRONT INCLINATION ANGLE OF AUXILIARY BACKUP CUTTERS Russian patent published in 2014 - IPC E21B10/14 E21B10/43 

FIELD: mining.

SUBSTANCE: hybrid drilling bit includes a bit housing with an axis, a blade on the bit housing, a rolling cutter assembly installed on the bit housing. The bit includes the main cutter having cutting surface projecting partially from the blade, located so that it can pass along the cutting trajectory at rotation of the bit housing about the axis and having the configuration providing the capture of rock at movement along the cutting trajectory; and a set of cutters, which includes several rear cutters, each of which has cutting surface projecting partially from the blade. Each rear cutter is located so that it can follow after the main cutter along the cutting trajectory at rotation of the bit housing rotation about its axis. At least one of the rear cutters of the set of cutters has side front angle that is within the side front angle of approximately 5 degrees to side front angle of approximately 75 degrees or within the side front angle of approximately minus 5 degrees to the side front angle of approximately minus 75 degrees. At least one cutter of the above said set is offset from the rotation trajectory of the main cutter approximately by groove width.

EFFECT: improved drilling characteristics.

17 cl, 4 dwg