| 摘要 |
A drill bit for boring concrete, capable of (1) supplying cooling liquid to the tip of the bit without fail, (2) facilitating discharge of core penetrated into the body, and (3) preventing the operating speed from being lowered by the wear of the inner circumference of the bit. For this purpose, (1) a path for cooling liquid communicating with the pointed end of the bit tip is formed within the peripheral plate of the drill body; (2) a slope is formed at the inner deep portion within the drill body, and a port for discharging the core is formed in the peripheral plate of the body; and (3) an inversely tapered face is formed on the inner circumference of the bit tip.
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