| 发明名称 |
Drill rod |
| 摘要 |
<p>A drill string for rock drilling has a drill rod with, at the bit end, a female threaded socket (4). The bit has a male threaded shank which (16) screws into the socket. The socket may additionally have an external male thread (3).</p> |
| 申请公布号 |
EP0748923(A2) |
申请公布日期 |
1996.12.18 |
| 申请号 |
EP19960109669 |
申请日期 |
1996.06.17 |
| 申请人 |
BOART LONGYEAR LIMITED |
发明人 |
ROBERTS, NIGEL;O'BRIEN, JOHN;ANDERSSON, KJELL;LOUGHLIN, DEREK |
| 分类号 |
E21B17/042;(IPC1-7):E21B17/042 |
主分类号 |
E21B17/042 |
| 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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