| 发明名称 |
KLOTFORMIG BORRSPETS. |
| 摘要 |
A rotary bit having a pair of semi-spheres rotating about a shaft extending from a center tongue. The semi-spheres include a plurality of cutters arranged in a predetermined fashion to maximize cutting efficiency. The semi-spheres may be disposed slightly off-center from the bit's axis of symmetry to bias the bit in a particular direction. |
| 申请公布号 |
FI850973(L) |
申请公布日期 |
1985.09.20 |
| 申请号 |
FI19850000973 |
申请日期 |
1985.03.12 |
| 申请人 |
INCO LIMITED |
发明人 |
ENGLAND, JOHN RICHARD;DESJARDINS, DONALD A. |
| 分类号 |
E21B7/08;E21B10/08;E21B10/16;E21B10/28;E21B10/40;E21B10/52 |
主分类号 |
E21B7/08 |
| 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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