发明名称 |
THREAD DEVICE, THREAD JOINT AND DRILL STRING COMPONENT FOR PERCUSSIVE ROCK DRILLING |
摘要 |
A device in a drill string component for percussive rock drilling including a thread for threading together with another drill string component including a complementary thread. The thread includes a thread groove formed by two thread flanks and an intermediate thread bottom. In operation one of the flanks forms a pressure flank. The thread groove has an essentially equally shaped sectional form along its axial extension. The thread bottom exhibits at least three surface portions with part-circular shape, as seen in an axial section. The surface portions with part-circular shape have increasing radiuses, as seen from each thread flank to an intermediate surface portion of the thread bottom. Also a thread joint and a drill string component. |
申请公布号 |
US2014083778(A1) |
申请公布日期 |
2014.03.27 |
申请号 |
US201214119112 |
申请日期 |
2012.05.15 |
申请人 |
BERONIUS ALEXANDER;NORDFELDT LEIF;ATLAS COPCO SECOROC AB |
发明人 |
BERONIUS ALEXANDER;NORDFELDT LEIF |
分类号 |
E21B7/00;E21B1/00 |
主分类号 |
E21B7/00 |
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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