| 发明名称 |
A DRILL BIT |
| 摘要 |
A masonry drill bit having an active diameter of D, comprising a shaft and a tip 1 for engaging a workpiece, wherein the tip 1 is formed with a plurality of stepped portions shaped to cut a workpiece as the drill bit rotates. By virtue of the drill bit tip 5 configuration as described and claimed herein, a masonry drill bit 1 having improved performance is provided. |
| 申请公布号 |
CA2216143(C) |
申请公布日期 |
2002.07.02 |
| 申请号 |
CA19972216143 |
申请日期 |
1997.09.19 |
| 申请人 |
BLACK & DECKER INC.;PLANSEE TIZIT AKTIENGESELLSCHAFT |
发明人 |
FERSTL, WERNER;BIRK, RUDI;HUBER, RONALD;LEMPACH, WALTER |
| 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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