发明名称 |
RAISE DRILL WITH REPLACEABLE STEM |
摘要 |
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. |
申请公布号 |
AU1559976(A) |
申请公布日期 |
1978.01.12 |
申请号 |
AU19760015599 |
申请日期 |
1976.07.05 |
申请人 |
SMITH INTERNATIONAL, INC. |
发明人 |
ROBERT LEE DIXON;ROBERT EUGENE ALLISON |
分类号 |
E21B7/28;E21B10/10;E21B10/18;E21B10/28 |
主分类号 |
E21B7/28 |
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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