发明名称 |
DRIVER |
摘要 |
A driver or dogging element adapted to transfer torsion forces between a rotating outer tube (10) and a drill bit (1) of a down-the-hole hammer, wherein the dogging element (7) is made of a softer material than those parts (3, 4) of the drill bit (1) that co-act with the dogging element (7, 8).
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申请公布号 |
WO03062585(A1) |
申请公布日期 |
2003.07.31 |
申请号 |
WO2002SE02275 |
申请日期 |
2002.12.10 |
申请人 |
ATLAS COPCO SECOROC AB;STJERNSTROEM, KARL, AXEL;GREIJER, THOMAS |
发明人 |
GREIJER, THOMAS |
分类号 |
E21B4/20;E21B17/046;(IPC1-7):E21B4/06 |
主分类号 |
E21B4/20 |
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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