发明名称 |
TWIST DRILL WITH ASYMMETRICALLY SPACED SUPPORT MARGINS |
摘要 |
A helical twist drill has fluted lands (6) each having projecting from their radially outer faces a plurality of circumferentially spaced support margins (21, 22, 23, 24). At least one of the suport margins (24) is asymmetrically spaced with respect to the other support margins (21, 22, 23). |
申请公布号 |
WO9735682(A1) |
申请公布日期 |
1997.10.02 |
申请号 |
WO1997GB00831 |
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 |
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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