DRILL BIT Russian patent published in 2016 - IPC E21B10/46 E21B10/56 

FIELD: drilling of soil or rock.

SUBSTANCE: invention relates to drill bits with hard-alloy cutting structure. Drill bit includes a body with cylindrical holes, in which are secured hard-alloy inserts with a shank and working head in form of a torus part. Shank of each insert has multiple sections, outer surface of which is equipped with longitudinal protrusions with triangular cross section. Sections of shanks with longitudinal protrusions are shifted relative to each other in vertical and horizontal planes. Total height of sections with protrusions is not less than height of shank, pressed into body.

EFFECT: technical result is to increase the efficiency of the drilling tool.

1 cl, 2 dwg