发明名称 |
Rock bit with improved thrust face |
摘要 |
A rotary cone drill bit includes a drill bit body having two or more support spindles extending inward and downward toward a vertical axis of the drill bit body. Each support spindle of the drill bit includes a base pin and further includes a pilot pin extending from the base pin along a longitudinal axis of the support spindle. A conical-shaped thrust face forms the transition from the base pin to the pilot pin. A cutting cone is rotatably mounted on each support spindle and includes a conical internal surface to run in contact with the conical thrust face of the support spindle. Rotation of the cutting cone carries lubricant from the non-load side of the spindle to the contact surfaces on the load side of the spindle.
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申请公布号 |
US5944125(A) |
申请公布日期 |
1999.08.31 |
申请号 |
US19970878622 |
申请日期 |
1997.06.19 |
申请人 |
VAREL INTERNATIONAL, INC. |
发明人 |
BYRD, CHRIS S. |
分类号 |
E21B10/22;E21B10/24;(IPC1-7):E21B10/22 |
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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