FIELD: mining.
SUBSTANCE: invention relates to drilling in soil. Drill tool comprises drill rod element (14), that is connected to rotary drive, and driven in rotating manner about drilling axis, frame-like housing and at least one removal tooth, which is mounted the housing radially movable between a retracted position in the housing and a working position, in which at least one removal tooth radially projects from the housing. On the drill rod element there is a transmission mechanism which is arranged within the housing for transmitting motion and/or rotational movement of drill rod element into radial movement for radial adjustment of at least one removal tooth. In the peripheral wall of the housing passage openings are arranged for at least one removal tooth.
EFFECT: simplified drill diameter increase in the drill well bottom.
11 cl, 14 dwg
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