发明授权
- 专利标题: Core bit having axial conical core breaker
- 专利标题(中): 芯轴具有轴向圆锥形断路器
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申请号: US892357申请日: 1978-03-31
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公开(公告)号: US4207954A公开(公告)日: 1980-06-17
- 发明人: Robert Jerome
- 申请人: Robert Jerome
- 申请人地址: FRX Paris
- 专利权人: Compagnie Francaise des Petroles
- 当前专利权人: Compagnie Francaise des Petroles
- 当前专利权人地址: FRX Paris
- 优先权: FRX7709825 19770331
- 主分类号: E21B10/04
- IPC分类号: E21B10/04 ; E21B10/26 ; E21B10/46 ; E21B9/16
摘要:
A drilling tool comprising a body having a leading face with a central recess providing the body with an annular leading cutting edge such that during drilling a central core is formed, and a central cone positioned axially in the recess for breaking up the core.
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