发明授权
- 专利标题: Mine tool roof bit insert and a method of drilling therewith
- 专利标题(中): 矿山工具车顶钻头刀片及其钻孔方法
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申请号: US497959申请日: 1983-05-25
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公开(公告)号: US4527638A公开(公告)日: 1985-07-09
- 发明人: Jaime Sanchez , Vinod K. Sarin
- 申请人: Jaime Sanchez , Vinod K. Sarin
- 申请人地址: MA Waltham
- 专利权人: GTE Laboratories Incorporated
- 当前专利权人: GTE Laboratories Incorporated
- 当前专利权人地址: MA Waltham
- 主分类号: E21B10/58
- IPC分类号: E21B10/58 ; E21B17/00
摘要:
A mine tool roof bit insert geometry of a 30.degree. 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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