发明申请
- 专利标题： Structure of a screw
- 专利标题（中）： 螺丝结构
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申请号： US09760838申请日： 2001-01-17
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公开(公告)号： US20010005474A1公开(公告)日： 2001-06-28
- 发明人: Chun-Chin Chen
- 主分类号： F16B035/00
- IPC分类号： F16B035/00
摘要：
A screw includes a cylindrical shank having an upper portion formed with spiral circular threads and a lower portion formed with spiral triangular threads, each of the spiral triangular threads having three budges having three sharp edges and three pointed tips, the pointed tips of the spiral triangular threads being located at different positions, the cylindrical shank having a pointed end at a lower portion thereof, whereby the screw can be easily and rapidly turned into a piece of hard wood.
公开/授权文献
- US06468014B2 Screw with spiral triangular threads 公开/授权日：2002-10-22
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