FIELD: mining industry.
SUBSTANCE: device has body, pusher piston placed inside and extending cutting tool in form of cutting disk mounted on axis with mechanism for its extension. Perforator is provided with additional cutting disk, mounted on additional axis with possible performing of two diametrically placed slits in a column by cutting disks. Disk extending mechanism includes a bar mounted on central axis, on shoulders of which axes of cutting disks are placed in apertures. Bar is made with possible rotation during displacement of pusher piston.
EFFECT: higher reliability, manufacturability and productiveness.
5 cl, 2 dwg
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