专利检索 ap:"Defa Zeng" 第 1 页

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发明授权
Roller bit for rock breaking by rotary cutting 有权

公开(公告)号：US09828806B2

公开(公告)日：2017-11-28

申请号：US14240739

申请日：2012-02-01

申请人： Liang Zhang , Shu Li , Jialin Tian , Defa Zeng

发明人： Liang Zhang , Shu Li , Jialin Tian , Defa Zeng

IPC分类号： E21B10/08

CPC分类号： E21B10/08

摘要： A roller bit for rock breaking by rotary cutting comprises: a bit body (1), a roller (2) and cutting teeth (3). An included angle β between a roller journal plane of the bit body and the roller on a bit axis has a range of 0°