Improved structure of spiral anger and profiled semi screw pole body

Improved structure of spiral anger and profiled semi screw pole body

  • CN 1,904,307 A
  • Filed: 07/27/2005
  • Published: 01/31/2007
  • Est. Priority Date: 07/27/2005
  • Status: Active Application
First Claim
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1. , a kind of auger stem structure-improved, it includes drilling rod, drill bit, and drill bit is a pyramidal structure, and drilling rod has at least a part to be helical structure, the spiral part that it is characterized in that drilling rod is an inverted trapezoidal structure, and promptly it has the outer gauge structure for enlarging gradually from bottom to top.

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