专利检索 ap:("KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY") AND inv:"Dae Young Shin" 第 1 页

1.

发明授权
Drill bit including button array having different radii extending from center of head section 有权

公开(公告)号：US10006252B2

公开(公告)日：2018-06-26

申请号：US14410071

申请日：2013-05-27

申请人： KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY

发明人： Jung Woo Cho , Dae Young Shin , Jin Seok Yang , Kyoung Il Moon , Ki Beom Kwon , Chang Heon Song , Joo Young Oh

IPC分类号： E21B10/36 , E21B10/56 , E21B10/43 , E21B10/54 , E21B10/46

CPC分类号： E21B10/56 , E21B10/36 , E21B10/43 , E21B10/46 , E21B10/54

摘要： A drill bit including a button array having different radii extending from the center of a head section, and more particularly, to a drill bit in which buttons are arranged so as to have different radii from the center of a drill bit head section, thereby striking bedrock points having different radii and improving the efficiency of a drilling operation.