发明名称 |
Rock drill having an internal flushing channel |
摘要 |
A rock drill for percussive drilling includes a shank, a collar connected to a front end of the shank, and a rod portion which at one end connects to the collar while the other end carries a rock cutting means. A central flush channel extends from the front free end of the shank in a direction towards the front end. The central flush channel has a substantially constant diameter (d) along essentially its entire length; a ratio of the diameter (d) to a smallest outer cross sectional width (D) of the rod portion being in the range of 0.35 to 0.43.
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申请公布号 |
US6102141(A) |
申请公布日期 |
2000.08.15 |
申请号 |
US19980148993 |
申请日期 |
1998.09.08 |
申请人 |
SANDVIK AB |
发明人 |
ENGSTROEM, HAAKAN;HEDLUND, JAN-GUNNAR;PALMBERG, GOERAN |
分类号 |
E21B17/00;(IPC1-7):E21B10/38 |
主分类号 |
E21B17/00 |
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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