发明名称 |
GESTEINSBOHRER |
摘要 |
A rock drill is formed of an axially elongated member made up of a cutting bit at one end followed by a helically grooved shaft and then ending in a shank. At least a portion of the groove, viewed in the axial direction of the member, has a stepped bottom providing groove sections of different depths. The depth of the groove sections from the surface of the shaft decreases in the direction toward the shank. |
申请公布号 |
DE3014693(A1) |
申请公布日期 |
1981.10.22 |
申请号 |
DE19803014693 |
申请日期 |
1980.04.16 |
申请人 |
HILTI AG |
发明人 |
RUMPP,GERHARD,ING.;SCHOLZ,DIETER,DIPL.-ING. |
分类号 |
E21B10/00;E21B10/44;E21B17/22;(IPC1-7):28D1/14 |
主分类号 |
E21B10/00 |
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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