| 摘要 |
PROBLEM TO BE SOLVED: To easily attach/detach the bit of a drilling apparatus in a short time. SOLUTION: In the drilling apparatus having the cylindrical bit 10 having a drilling blade 10a for drilling an object 52a in its tip part and a holding part 20 for holding the base end part of the bit 10, the holding part 20 has a holding part main body to be inserted into the recessed part of the base end part of the bit 10 and a projection projecting from the outside surface of the holding part main body, the bit 10 has an axial channel which is formed in the axial direction from the base end toward the tip part and allows the passage of the projection and a circumferential channel which communicates with the axial channel, is formed in the circumferential direction, and allows the movement in the circumferential direction of the projection, and a regulation part for regulating the movement in the circumferential direction of the projection is provided. COPYRIGHT: (C)2004,JPO
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