Gimlet and mould thereof

Gimlet and mould thereof

CN
  • CN 205,466,620 U
  • Filed: 01/28/2016
  • Issued: 08/17/2016
  • Est. Priority Date: 01/04/2016
  • Status: Active Grant
First Claim
Patent Images

1. a carpenter'"'"'s auger, it is made up of drill bit, drilling rod and drillstock, wherein, described drill bit has drill bit base portion, apex point, circumferential cutting edge and main cutting edge, described apex point system is placed in the end face center of described drill bit base portion, described circumferential cutting edge system is placed in the angle head cylindrical of described drill bit base portion, described main cutting edge system connects described apex point and described circumferential cutting edge, the rear knife face of described main cutting edge is connected with a step, it is characterized in that, described step is formed by connecting by first and the second face, and described first is oblique section, and described second is vertical.

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