DRILL BIT WITH REMOVABLE HEAD PART Russian patent published in 2021 - IPC E21B10/38 E21B10/60 E21B4/14 

FIELD: drilling.

SUBSTANCE: group of inventions relates to the arrangement of a drill bit for impact drilling tools with a hydraulic drive. The arrangement of the drill bit for impact drilling tools with the hydraulic drive contains an impact bit containing a bit head part removably connected to an axially passing shank, axially passing slots made on the outer cylindrical wall of the shank, interacting with the possibility of sliding with response slots made inside a drive clamping chuck, by means of which the rotation can be transferred from the clamping chuck to the shank, at least one washing channel passing through the shank and the bit head part between the outer cylindrical wall of the bit shank and a cutting surface of the bit head part to provide a path for passing a washing medium between a slot section of the bit shank and the cutting surface of the bit head part, and a chamber made between the end surface of the bit shank and the bit head part, wherein the first channel section and the second channel section or each of the first and the second section channels communicate with the chamber via fluid. Each of at least one washing channels contains the first channel section in the bit shank passing through the shank from the outer cylindrical wall of the bit shank to the end surface of the bit shank, adjacent to the bit head part, and the second channel section passing through the bit head part.

EFFECT: proper lubrication of slots or engaging means is provided, while minimizing the risk of cavitation for the piston nose part and preventing unnecessary replacement of the bit shank.

13 cl, 8 dwg