×

Drill bit button insert and drill bit

  • US 10,352,104 B2
  • Filed: 11/26/2015
  • Issued: 07/16/2019
  • Est. Priority Date: 11/27/2014
  • Status: Active Grant
First Claim
Patent Images

1. A drill bit button insert that is attached to a button inserts mounted in a drill bit and performs a drilling, comprising:

  • a tip body; and

    an abrasive layer formed of a diamond sintered body harder than the tip body coated at least at a button insert working surface of the tip body,wherein the abrasive layer has two or more high hardness layers and a low hardness layer having a hardness lower than that of the two or more high hardness layers disposed between two or more high hardness layers, from a surface side of the abrasive layer toward a tip body side, andwherein an intermediate layer having a hardness lower than that of the two or more high hardness layers and a hardness higher than that of the low hardness layer is disposed between one of the two or more high hardness layers in the surface side of the abrasive layer and the low hardness layer, from the surface side of the abrasive layer toward the tip body side.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×