FIELD: mining.
SUBSTANCE: presented group of inventions refers to drilling tool. Drill rod contains joining section including far end with cylindrical section of small diametre, section of external cylindrical thread and end section of thread being continuation of near end of external cylindrical thread section. At that joining section is formed in such a way that thread diametre does not decrease from far end to near end of joining section. Diametre of end section increases by degrees from external cylindrical thread to near end of rod joining section. At that curve radius of end section of external thread exceeds curve radius of section of root of external thread. Drill bit contains seat including section of internal cylindrical thread and end section of internal thread being continuation of far end of internal cylindrical thread section and having specified maximum distance decreasing towards cylindrical far end of end section. Drilling tool contains mentioned drill rod and drill bit and is formed by screwing of section of external cylindrical thread of drill rod with section of internal cylindrical thread of drill bit.
EFFECT: improvement of safety of connection of drill bit with drill rod.
9 cl, 8 dwg
