发明授权
- 专利标题： Hole drill and debris clearance method and means
- 专利标题（中）： 孔钻和钻孔清理方法与手段
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申请号： US43563274申请日： 1974-01-23
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公开(公告)号： US3863723A公开(公告)日： 1975-02-04
- 发明人: GODFREY CHARLES S
- 申请人： PHYSICS INT CO
- 专利权人： Physics Int Co
- 当前专利权人： Physics Int Co
- 优先权： US43563274 1974-01-23
- 主分类号： E21B7/14
- IPC分类号： E21B7/14 ; E21C37/00 ; E21B7/00 ; E21B19/00
摘要：
In a method and means of rock fracturing and excavating holes using a cannon to fire hypervelocity projectiles at the rock, the debris created in the course of such excavation is removed by releasing the propellant gases created in the firing of the projectiles in the hole in a manner to blow the debris out of the hole.