FIELD: mining picks and holders therefore, particularly means to retain regulation tools or drilling bits used in mining industry, for trench digging-out and for building works performing.
SUBSTANCE: cutting unit comprises retainer and cutting tool body installed in retainer orifice, as well as fixing bush adapted to retain cutting tool body inside the orifice in axial direction and to freely rotate cutting tool body about longitudinal axis. Fixing bush has tongues bent inwards, which pass into groove formed in cutting tool body shank. Fixing bush has configuration to facilitate small particle removal from the groove during cutting operation performing.
EFFECT: increased ability of free tool rotation and minimized tool clogging with compacted small particles, which prevent free tool rotation.
6 cl, 9 dwg
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