发明名称 |
LJUDDEMPAD BERGBORR |
摘要 |
A rock drill includes a drill shank with a boring head at one end and laterally enclosed for at least a portion of its length by a tubular shell. A helix extends around the outside of the tubular shell for carrying borings away from the boring head. Supporting members formed of a sound attenuating material are located between the helix and the other parts of the rock drill. |
申请公布号 |
SE448565(B) |
申请公布日期 |
1987.03.02 |
申请号 |
SE19810007018 |
申请日期 |
1981.11.25 |
申请人 |
HILTI AG |
发明人 |
1)U * LUTZE;2)D * SCHOLZ;3)E * BRENNSTEINER |
分类号 |
B25D17/12;B25D17/11;E21B10/44;E21B17/00;E21B17/22;(IPC1-7):E21B17/00 |
主分类号 |
B25D17/12 |
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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