DRILLING STRAIGHT BIT FOR DRILLING DEVICE Russian patent published in 2018 - IPC E21B7/04 E21B4/02 E21B10/00 

FIELD: mining.

SUBSTANCE: downhole drilling device comprises a bearing block housing forming a longitudinal axis and an upper and a lower portion. The upper part of the bearing block housing is adapted to be connected to the drill string, at least one annular bearing unit mounted in the bearing block housing and a central portion of the drill bit substantially disposed at the lower end of the bearing block housing and connected thereto. The central part is rotatable about a longitudinal axis and has blades attached thereto. The blades bear a lot of incisors. The incisors are configured to come into contact with a subterranean rock formation, a shank protruding from the central portion. The shank is integral or integral with the central part or is permanently connected to the central part, and a spindle mating with the shank and forming an integral connection thereto. A non-detachable connection does not include a re-release connection. The spindle extends longitudinally into the bearing block housing and through at least one annular bearing block.

EFFECT: reduce the length of the device, increase the effective life of the bit.

16 cl, 8 dwg