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1. 发明授权

US5269387A Insert for mine roof tool bit 失效
标题翻译：插入矿山屋顶工具钻头
公开(公告)号：US5269387A
公开(公告)日：1993-12-14
申请号：US842551
申请日：1992-02-27
申请人： Larry S. Nance
发明人： Larry S. Nance
IPC分类号： E21B10/58
CPC分类号： E21B10/58
摘要： This mine roof tool bit insert, formed from a flat elongated body, provides opposed side faces, opposed end faces, a bottom face, opposed top faces and opposed intermediate faces disposed between associated top faces and end faces, the body forming identical halves rotating about a central axis. Each half includes a top cutting edge an intermediate cutting edge and end cutting edge. The top face, intermediate face and end face are planar and are rearwardly inclined to provide a constant relief angle. The intermediate cutting edge is inclined relative to a plane normal of the axis of rotation at an angle greater than that of the top cutting edge. The method of drilling a hole in a mine roof using a bit insert of this character includes positioning the insert, rotating the insert at about 200 to 1000 rpm and applying a thrust of about 1000 to 8000 lbs. to the insert.
摘要翻译：这种由平坦的细长体形成的矿山车顶工具钻头插入件提供相对的侧面，相对的端面，底面，相对的顶面和相对的中间面，其设置在相关的顶面和端面之间，中心轴。每一半包括顶切割边缘，中间切割边缘和末端切割边缘。顶面，中间面和端面是平面的并且向后倾斜以提供恒定的倾斜角。中间切削刃相对于旋转轴线的平面法线倾斜，角度大于顶部切削刃的角度。使用该字符的钻头插入件在矿山屋顶钻孔的方法包括定位插入件，以约200至1000rpm旋转刀片并施加约1000至8000磅的推力。到插入。

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