发明名称 |
Air percussion drilling assembly |
摘要 |
An air percussion hammer drill is disclosed for operation in an earthen formation. The air compression hammer mechanism comprises a piston that reciprocates while simultaneously rotating within its housing. A hammer drill bit slidably keyed to the bottom of the piston transfers the impact energy to the formation and rotates during operation independent of an attached drill string.
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申请公布号 |
USRE36848(E) |
申请公布日期 |
2000.09.05 |
申请号 |
US19960665801 |
申请日期 |
1996.06.18 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
BUI, HUY D.;OLIVER, MICHAEL S. |
分类号 |
E21B4/00;E21B4/14;E21B4/16;(IPC1-7):E21B4/14 |
主分类号 |
E21B4/00 |
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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