发明名称 |
Masonry bit |
摘要 |
A masonry drill bit has an active diameter of D, comprising a shaft 2 and a tip for engaging a workpiece. The tip is formed with a plurality of stepped portions 11, 13 shaped to cut a workpiece as the drill bit rotates. The tip is of tungsten carbide although the centre portion 11 may be of steel and formed as a continuation of the shaft 2. |
申请公布号 |
GB2318072(A) |
申请公布日期 |
1998.04.15 |
申请号 |
GB19960019795 |
申请日期 |
1996.09.21 |
申请人 |
* PLANSEE TIZIT GMBH;* BLACK & DECKER INC. |
发明人 |
WERNER * FERSTL;RONALD * HUBER;WALTER * LEMPACH;RUDI * BIRK |
分类号 |
E21B10/00;B23B35/00;B23B51/00;(IPC1-7):B23B51/02 |
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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