发明名称 |
Reversible casing for a self-lubricating, fluid-actuated, percussive down-the-hole drill |
摘要 |
A reversible casing for a fluid-actuated, percussive, down-the-hole drill is provided with a tubular body having an internal surface forming a bore extending along a longitudinal axis. The internal surface has a profile that is a mirror image about a centerline axis perpendicular to the longitudinal axis. The profile is provided with alternating undercut portions and land portions, with a portion of the undercut portions being in an annular scalloped configuration comprising a plurality of longitudinally extending parallel grooves in the internal surface.
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申请公布号 |
US5566771(A) |
申请公布日期 |
1996.10.22 |
申请号 |
US19950520799 |
申请日期 |
1995.08.30 |
申请人 |
INGERSOLL-RAND COMPANY |
发明人 |
WOLFER, DALE R.;LYON, LELAND H. |
分类号 |
E21B4/14;(IPC1-7):E21B4/14 |
主分类号 |
E21B4/14 |
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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