发明名称 |
Method for making a self-drilling and self-tapping screw |
摘要 |
A self-drilling and tapping screw, the self-drilling portion of which is formed in two major operations. A cutting tip is formed on the tip of a screw blank by a pair of rotating circular saw blades in a first operation. A pair of flutes extending from the cutting tip to the threaded portion of the stem are formed by a second pair of rotating circular saw blades in a second operation.
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申请公布号 |
US5382195(A) |
申请公布日期 |
1995.01.17 |
申请号 |
US19920995112 |
申请日期 |
1992.12.22 |
申请人 |
ATLAS BOLT & SCREW COMPANY |
发明人 |
HILER, ALLEN J. |
分类号 |
B23G5/20;F16B25/00;F16B25/10;(IPC1-7):B23G9/00 |
主分类号 |
B23G5/20 |
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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