| 发明名称 |
DRILL STRING WITH INTERFERENCE FIT COUPLINGS AND COUPLERS THERFOR |
| 摘要 |
A threaded end of a drill rod is formed from a sleeve to one end of the body . The sleeve has a threaded bore to receive a threaded end of an adjacent component and is secured to the body of the rod by an interference fit betwe en a bore and spigot on the two components.
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| 申请公布号 |
CA2392820(A1) |
申请公布日期 |
2001.05.03 |
| 申请号 |
CA20002392820 |
申请日期 |
2000.10.27 |
| 申请人 |
BOART LONGYEAR INC. |
发明人 |
YAO, JAMES JING |
| 分类号 |
E21B17/04;E21B17/042;(IPC1-7):E21B17/042;E21B17/03 |
主分类号 |
E21B17/04 |
| 代理机构 |
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代理人 |
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