发明名称 |
Rotary drill bit having a solid forged, unitary body |
摘要 |
A rotary drill bit for use on a rotating drill string includes a solid forged unitary main body having a plurality of downwardly facing hemi-cylindrical body surfaces. A plurality of cutter bases are provided, each cutter base including an upwardly facing hemi-cylindrical base surface that is fused to one of the body surfaces by electron beam welding. Each cutter base includes a bearing pin extending inwardly with respect to the bit. A cone shaped cutter is rotatably mounted on the bearing pin for rotating about the bearing pin during drilling operations to bore through earth formations.
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申请公布号 |
US4256194(A) |
申请公布日期 |
1981.03.17 |
申请号 |
US19780907485 |
申请日期 |
1978.05.19 |
申请人 |
VAREL MANUFACTURING COMPANY |
发明人 |
VAREL, DANIEL W. |
分类号 |
E21B10/16;E21B10/20;(IPC1-7):E21B10/50 |
主分类号 |
E21B10/16 |
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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