| 发明名称 |
RULLBORRKRONA MED KONISKT UTFORMADE SKERRULLAR |
| 摘要 |
A rotary drilling bit with conically shaped rotary cutters which are supported in bearings on the drilling bit body by a plurality of bearings. At least one seal is provided in each rotary cutter for separating the bearing cavities of the bearings. |
| 申请公布号 |
SE7812690(A) |
申请公布日期 |
1979.06.15 |
| 申请号 |
SE19780012690 |
申请日期 |
1978.12.11 |
| 申请人 |
* SKF KUGELLAGERFABRIKEN GMBH |
发明人 |
A * OLSCHEWSKI;H * KUNKEL;M * BRANDENSTEIN;L * WALTER |
| 分类号 |
E21B10/16;E21B10/22;E21B10/25 |
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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