| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting bit for woodcraft used for boring a linear or curved through-hole or groove hole and a cone-shaped circular hole in wood or the like, well discharging wood refuse and having good cutting efficiency. SOLUTION: A boring blade body part 3 is equipped with two sets of paired blade plate parts 5 and 6 arranged at an equal interval in a peripheral direction and the central pointed part 7a forward protruded toward the leading end surface of a center shaft part. The linear edge parts on the side of the rotary direction of the leading end surfaces of one sets of the blade plate parts 5 of two sets of the paired blade plate parts 5 and 6 are formed to cutting blades 7 for forward cutting and the leading end surfaces of the other one set of the blade plate parts are extended horizontally in a radial direction and depressed into a recessed shape at its intermediate part to be formed to a rough shaping/cutting blade 8 for forward cutting. An outside pointed blade 8a is provided as a marking blade in a protruded state and a cutting blade 9 for lateral cutting is also provided. The respective gap parts 12 in the peripheral direction of the respective blade plate parts 5 and 6 are set to cut refuse discharge passages. COPYRIGHT: (C)2004,JPO&NCIPI
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