COMPOSITE CUTTER FOR MINING MACHINES Russian patent published in 2012 - IPC E21C35/18 

FIELD: mining.

SUBSTANCE: composite cutter includes holder and replaceable working head with hard-alloy insert, which is arranged on its front part. Cylindrical cavity is made in rear end surface of replaceable working head in order to fix component parts. Replaceable working head has the possibility of free rotation relative to the holder about its longitudinal axis. It is retained against movement along that axis with locking member made in the form of radial projections on side surface of front holder part. Annular groove is provided in the cavity of replaceable head for its free rotation, and the corresponding slots are made for the holder projections to enter that groove. Replaceable working head is retained against falling out, when holder projections coincide with longitudinal slots, with a setting screw. Screw is screwed into threaded hole drilled in side surface of the head and covers one of longitudinal slots.

EFFECT: improving maintainability of the design, which is related to replacement of worn-out working part of the cutter.

2 cl, 3 dwg