FIELD: mining, particularly percussion rock drilling.
SUBSTANCE: male drill rod section has areas with decreased cross-sections, thread for percussion rock drilling having end and formed at male section end. Male section end has joining surface to transmit shock waves. Male section comprises the first cross-sectional area defined in zone of full thread profile and the second cross-sectional area located directly beyond the thread end. The second cross-sectional area exceeds the first one. Area length is defined as length of cylinder beginning from impact surface plane. Cylinder diameter is equal to outer thread diameter. Ratio between length and outer thread diameter is within 1 - 2. Drill bit and threaded connection between male drill rod section and drill bit are also disclosed.
EFFECT: increased fatigue resistance in area having decreased cross-section and at drill member thread bottoms.
8 cl, 8 dwg
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