Spade drill bit

Spade drill bit

  • CN 1,758,977 B
  • Filed: 03/11/2003
  • Issued: 12/05/2012
  • Est. Priority Date: 03/11/2003
  • Status: Active Grant
First Claim
Patent Images

1. drill bit comprises:

  • The drive end part;

    Be connected to the handle of said drive end part;

    Be connected to the blade of said handle, said blade has the opposite face of pair of parallel, and said opposite face is coupled together by a pair of lateral surface that is parallel to said handle usually;

    A pair of side shoulder, thus extend internally and partly assemble the front end that forms said blade in center point from said lateral surface;

    Along the cutting edge part that the front end of said blade forges, the part of wherein said blade along direction of rotation to front curve, and wherein each said side shoulder from said each lateral surface to said center point part to front curve,Wherein, said center point partly has a plurality of discontinuous first screw thread and a plurality of continuous screw thread that is limited to wherein, wherein;

    Said center point partly comprises tip and pedestal,Said a plurality of continuous screw thread is positioned near the said tip of said center point part, andSaid a plurality of discontinuous first screw thread inserts between said a plurality of continuous screw threads and the said center point said pedestal partly,Said paired parallel opposite face is designed to flat,A plurality of discontinuous second screw threads are limited in the said paired lateral surface of said blade.

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