| 摘要 |
PROBLEM TO BE SOLVED: To enable replacement and reinforce the mounting of the cutting blade and a leading end of the spiral part to obtain high strength and enhance durability by providing a cutting blade separately from a spiral part. SOLUTION: In this drilling implement, a pointed end part is formed at a lower end of a core shaft; the spiral part is provided between the pointed end part and a base part of the core shaft; a mounting part, which is partially notched in a circumferential direction, is formed between the pointed end part and the spiral part; the cutting blade is detachably provided on the top surface of the mounting part; and a cutting edge, which is protruded to the side of the pointed end part from a notched part, is formed in the cutting blade. COPYRIGHT: (C)2005,JPO&NCIPI
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