DRILLING BIT Russian patent published in 2018 - IPC E21B10/38 

FIELD: soil or rock drilling.

SUBSTANCE: invention relates to mining and construction – to drilling tools designed to drill wells in shock-rotational manner. Drill bit for percussion-rotary drilling comprises body reinforced with rock-cutting inserts and a central washing channel communicating with lateral flushing channels are made in the body and with central hole, mouth of which is located on the front end of shell, end flushing channels, slurry furrows and cylindrical cutting tooth. Axis of the cylindrical cutting tooth is parallel to axis of said central hole. Central hole from the side of its mouth is partially covered by cylindrical cutting tooth.

EFFECT: technical result is to increase operational reliability by improving cleaning and cooling of mine face.

3 cl, 2 dwg