发明申请
- 专利标题： Screw having non-strip drive recess and driver bit for use with the screw
- 专利标题（中）： 螺丝带有无带驱动凹槽和螺丝刀用于螺丝
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申请号： US10856165申请日： 2004-05-28
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公开(公告)号： US20050047891A1公开(公告)日： 2005-03-03
- 发明人: Toshimasa Toyooka , Shinichi Hamano
- 申请人： Toshimasa Toyooka , Shinichi Hamano
- 优先权： JP2003-155321 20030530
- 主分类号： B25B15/00
- IPC分类号： B25B15/00 ; F16B23/00
摘要：
The present invention provides a screw, comprising a screw head having a drive recess and a screw shank having threads and being integrally formed with the screw head, wherein the drive recess includes a plurality of engaging grooves equiangularly radiating from an axis of the screw in plan view, a bottom face of each engaging groove having a steep slope, which is near to the screw shank, and a gentle slope, which is far from the screw shank, for enlarging the engaging area of the engaging grooves.