发明名称 |
WINGED DRILL SCREW |
摘要 |
A self-drilling and thread forming fastener for fastening a first softer workpiece, such as wood, to a second harder workpiece, such as metal, is described . The fastener features wings of improved configuration including positive angle of attack, positive cutting edge relief angles, teardrop-like crescent shape cross section and knife-like cutting edge which exhibit faster drill times through wood. |
申请公布号 |
CA2020498(A1) |
申请公布日期 |
1991.01.07 |
申请号 |
CA19902020498 |
申请日期 |
1990.07.05 |
申请人 |
PIACENTI, FRANK;FLINCHUM, STEVEN N. |
发明人 |
PIACENTI, FRANK;FLINCHUM, STEVEN N. |
分类号 |
B23G5/06;B21K5/02;F16B25/10;(IPC1-7):F16B25/02 |
主分类号 |
B23G5/06 |
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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