| 摘要 |
FIELD: mining industry. ^ SUBSTANCE: device has body with channel, to upper portion of which through shear clamp a cantilever is fixed with cutting tool and with capability for directional movement along the channel. Between cutting portion of tool and cantilever a stop is placed, with diameter a bit more than tool diameter, and rigidly connected to channel, while between cantilever and channel grooves a rib is mounted. Cantilever and rib are connected to each other by another shear clamp. ^ EFFECT: higher operation reliability. ^ 3 dwg
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