发明名称 |
SELF COUNTER-SINKING SCREW |
摘要 |
A self-countersinking screw including an inverted-conical head portion formed at a top with a cavity adapted to receive a tip of a screwdriver and having a conical bottom, said conical bottom having a plurality of triangular recesses each having a lateral side extending inwardly to form a sharp edge and a space for receiving chips, a threaded portion, and a tapered portion having a large diameter connected with the head portion and a small diameter connected with the threaded portion, whereby the sharp edge will make a countersink on a workpiece when the countersunk head screw is turned therein.
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申请公布号 |
CA2198832(A1) |
申请公布日期 |
1997.09.28 |
申请号 |
CA19972198832 |
申请日期 |
1997.02.28 |
申请人 |
WALTHER, ULI;YU, CHAO - HSIN MICHAEL |
发明人 |
WALTHER, ULI;YU, CHAO - HSIN MICHAEL |
分类号 |
F16B35/06;(IPC1-7):F16B25/02 |
主分类号 |
F16B35/06 |
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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