发明名称 |
Screw with protruding sheets on head portion |
摘要 |
A screw with protruding sheets on a head portion comprises a thread portion; a screw tail at one end of the thread portion, a slot formed on the screw tail; a plurality of screwing sheets formed at another end of the thread portion; a plurality of recesses formed between the plurality of screwing sheets for removing undesired pieces; a drilling head being formed at front ends of the screwing sheets; the drilling head formed with a plurality of protruding sheets made of soft metal. By screwing the screw by rotating from the slot, the screw will rotate so as to drill a hole and enter into a wood plate. Then the protruding sheets enlarge the hole. The undesired wood pieces are removed from the recesses. When the screw further drills into a metal plate, the protruding sheet will be worn out because the protruding sheet is made of soft metal.
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申请公布号 |
US6887023(B1) |
申请公布日期 |
2005.05.03 |
申请号 |
US20030740053 |
申请日期 |
2003.12.19 |
申请人 |
LU YING-KUNG;TSAI FENG-SONG |
发明人 |
LU YING-KUNG;TSAI FENG-SONG |
分类号 |
F16B25/10;(IPC1-7):F16B25/10 |
主分类号 |
F16B25/10 |
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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