发明名称 |
CHUCK FOR DRIVING A DRILL PIPE |
摘要 |
The invention relates to a drive mandrel for a drilling stem. The mandrel comprises a tubular element traversed by the drilling stem and having openings for the passage of jaws urged against the stem under the action of wedges. The wedges are spring biased against the jaws, and repelled from said jaws by hydraulic thrust. The wedges are mounted on an axially adjustable flange. |
申请公布号 |
DE2962450(D1) |
申请公布日期 |
1982.05.19 |
申请号 |
DE19792962450 |
申请日期 |
1979.08.13 |
申请人 |
DIAMANT BOART SOCIETE ANONYME |
发明人 |
LAMBOT, HONORE JOSEPH |
分类号 |
B23B31/173;E21B3/02;(IPC1-7):21B3/02 |
主分类号 |
B23B31/173 |
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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