Screw and method for using screw

Screw and method for using screw

  • CN 1,981,137 B
  • Filed: 04/08/2005
  • Issued: 04/25/2012
  • Est. Priority Date: 04/09/2004
  • Status: Active Grant
First Claim
Patent Images

1. screw comprises:

  • Shaft, it has pinnacle that is positioned at an end and the head that is positioned at the other end, and said head has lower surface;

    Be positioned at the screw thread on the said shaft;

    Be positioned at the knurled portion on the said shaft, said knurled portion is arranged between said screw thread and the said head;

    Be arranged at least one groove of said knurled portion;

    WithBe positioned at least one rib on the said lower surface of said head.

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