发明名称 |
Rotary cone type rock bits |
摘要 |
An earth boring bit of the type having three rotary cone cutters carried on bearing pins depending from respective head sections is disclosed. Adjacent the rear face of a cutter is located a portion of the respective head section commonly known as the shirttail. The invention discourages the intrusion of cuttings into the bearing surfaces or seals and reduces the likelihood of fracture of the shirttail. This is achieved by forming the coacting faces as truncated conical surfaces instead of the usual configuration of the prior art which is arranged substantially perpendicular to the bearing pin axis.
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申请公布号 |
US5016719(A) |
申请公布日期 |
1991.05.21 |
申请号 |
US19900469356 |
申请日期 |
1990.01.24 |
申请人 |
WESTERN ROCK BIT COMPANY LIMITED |
发明人 |
WHITE, KENNETH M. |
分类号 |
E21B10/22;E21B10/25;F16C33/80 |
主分类号 |
E21B10/22 |
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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