| 发明名称 |
TWIST DRILL WITH ASYMMETRICALLY SPACED SUPPORT MARGINS |
| 摘要 |
A helical twist drill has fluted lands each having projecting from their radially outer faces a plurality of circumferentially spaced support margins. At least one of the support margins is asymmetrically spaced with respect to the other support margins. |
| 申请公布号 |
EP0891239(B1) |
申请公布日期 |
2001.05.30 |
| 申请号 |
EP19970914431 |
申请日期 |
1997.03.25 |
| 申请人 |
DORMER TOOLS (SHEFFIELD) LIMITED |
发明人 |
HOWARTH, BERTRAM, VICTOR;GOODWIN, RICHARD |
| 分类号 |
B23B51/00;B23B51/02;E21B10/44;(IPC1-7):B23B51/02 |
主分类号 |
B23B51/00 |
| 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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