BIT Russian patent published in 2017 - IPC E21B10/44 B28D1/14 B23C3/32 B23B51/02 B24B19/04 

FIELD: drilling soil or rock.

SUBSTANCE: group of inventions relates to drill bits and methods of their production. Drill bit comprises mounting section, spiral, adjacent to mounting area, and head, adjacent to spiral. Spiral has configuration of, at least, double spiral and correspondingly has, at least, two essentially helical discharge grooves, for which by two essentially helical ribbons are correspondingly defined forming groove side walls. First discharge groove, including its side walls, has constant spiral pitch along bit longitudinal axis. At least, one of two spiral tapes, related to first discharge groove, has or have along bit longitudinal axis, at least, at sections, alternatively changing width.

EFFECT: technical result consists in drilled out material transportation optimization and natural oscillations effective suppression.

15 cl, 3 dwg