发明名称 |
REPLACEABLE DRIVE STEM FOR A RAISE DRILL |
摘要 |
<p>A raise type of earth boring drill in which the cutter assembly is detachably secured to the drive stem to permit replacement of the stem. The stem slidably engages a central opening in the cutter assembly, the cutter assembly engaging a shoulder on the stem which carries axial loads in the drill. The cutter assembly is detachably anchored by a plurality of bolts to a torque plate attached to the end of the stem for transmitting torque load to the cutter assembly, the bolts clamping the cutter assembly against the shoulder.</p> |
申请公布号 |
CA1057277(A) |
申请公布日期 |
1979.06.26 |
申请号 |
CA19780313893 |
申请日期 |
1978.10.19 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
DIXON, ROBERT L.;ALLISON, ROBERT E. |
分类号 |
E21B17/00;(IPC1-7):21B9/08;21B9/10;21B17/00 |
主分类号 |
E21B17/00 |
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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