FIELD: mining.
SUBSTANCE: invention relates to coal industry and is intended for rotary drilling of bore pits in rocks. Drill rod comprises bar body, shank and lock to secure cutter. Rod body is triangular with a cross-section in the form of a hypocycloid having rounded branches ends.
EFFECT: high strength of the drill rod when transmitting torque moments to the drilling tool and improved process of removing drilled rock.
1 cl, 2 dwg
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