BOER Russian patent published in 2017 - IPC B25D1/14 

FIELD: mining.

SUBSTANCE: boer contains a rotation axis, a shank for clamping the drill in the tool holder, and a rod for removing the drilling dust produced during drilling. At the end of the rod turned in the feeding direction, a bit head is fixed, which has a point (8) on the end facing towards the feed end. Rod with facing side in the feed direction and head with the request to the Web part are limited to relevant connecting surfaces through which the boer head is connected to the backbone. Dependence is given to determine the ratio of the diameter of the boer head to its height.

EFFECT: high drilling speed with a compact boer head shape.

16 cl, 25 dwg