| 摘要 |
PROBLEM TO BE SOLVED: To improve working performance and to reduce cost in drilling work using a diamond bit for concrete drilling and to increase strength and to reduce cost of a separate type shank connecting part. SOLUTION: This shank is devised to carry out concrete core removing work by easily removing a shank part main body by separating a motive power receiving and transmitting part of a diamond bit for concrete drilling and providing a hooked groove 2 and a projected thing 1 on the separated part. In the meantime, airtightness of the connecting part is secured by providing an O ring elastic body. Additionally, it is a separate type of a bit part shank of the diamond bit for concrete drilling, and the shank part main body is made into a male type connecting part.
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