| 摘要 |
In an excavation tool of the present invention, an embedding hole 8 is drilled in a distal end portion of a tool body 1 which is rotated about an axis line 0 and is moved forward to a distal end side in a direction of the axis line 0. In the embedding hole 8, an excavation tip 5A in which an embedding portion 6 having an outer cylindrical shape is formed integrally with a cutting edge portion 7 inserts the embedding portion 6 into the embedding hole 8 and causes the cutting edge portion 7 to protrude from the embedding hole 8. In this manner, the excavation tip 5A is rotatable around a central axis C of the embedding portion 6 during excavation, and is attached thereto by being locked so as not to slip toward a distal end side of the embedding portion 6 in a direction of the central axis C. Fig. 2 I (3) 3B,- |
