| 发明名称 |
SCALPELLO A RULLI CON RULLI DI TAGLIO DI FORMA CONICA. |
| 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 |
IT7829464(D0) |
申请公布日期 |
1978.11.06 |
| 申请号 |
IT19780029464 |
申请日期 |
1978.11.06 |
| 申请人 |
SKF KUGELLAGERFABRIKEN GMBH |
发明人 |
|
| 分类号 |
E21B10/16;E21B10/22;E21B10/25;(IPC1-7):E21B/ |
主分类号 |
E21B10/16 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
