| 摘要 |
rock-breaking tools, mining industry. SUBSTANCE: hole reamer includes body, pilot tip and claws with rotary bits housed in body. Washing branch pipes whose spaces communicate with space of body by means of radial ducts arranged perpendicular to longitudinal axis of body are located between rotary bits. Outlets of ducts are plugged. Body is releasably connected to tip with the help of thread. EFFECT: considerably reduced cost of drilling of one meter of hole. 2 cl, 1 dwg
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