FIELD: mining industry.
SUBSTANCE: device has bushing and sleeve with inner conical thread on free end connected to the latter, and nipple with outer conical thread at free end, connected to bushing. Thread is made special locking with step p=(10..12) mm, with profile angle α=40°..70° with profile height h=(7..12) mm, while diameter of greater cone base dp is connected to outer diameter of bar D by relation D≥1.05dp with values of D from 63 mm to 245 mm, and inner diameter of bar d is connected to diameter of greater base of cone by relation d≤(0.8..0.9)dp. On outer surface of bar close to each of its ends two couples of mutually perpendicular flats are made.
EFFECT: higher efficiency.
3 cl, 3 dwg
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