发明名称 |
Mine tool roof bit insert and a method of drilling therewith |
摘要 |
A mine tool roof bit insert geometry of a 30 DEG top relief angle between the top cutting edge and the top trailing edge and a radius of curvature of 1/16 inch at the corners improves the maximum wear and penetration rate when drilling into sandstone and a method therewith is described.
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申请公布号 |
US4527638(A) |
申请公布日期 |
1985.07.09 |
申请号 |
US19830497959 |
申请日期 |
1983.05.25 |
申请人 |
GTE LABORATORIES INCORPORATED |
发明人 |
SANCHEZ, JAIME;SARIN, VINOD K. |
分类号 |
E21B10/58;(IPC1-7):E21B17/00 |
主分类号 |
E21B10/58 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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