发明名称 Well pipe hoist and hoisting method
摘要 A portable apparatus for pulling well pipe upwardly through a well includes a well pipe hauling head which incorporates two opposed, inwardly tapering discs which are adapted to frictionally engage well pipe therein by only a quarter-turn engagement with the pipe. This allows for easy manual engagement and disengagement of the well pipe with the hauling head. The hauler head is mounted with suitable mounting apparatus permitting the hauler head to be freely rotatable in a supported position adjacent a well. The apparatus may be provided with a reduction gear box so that it may be actuated by a portable power drill.
申请公布号 US5996971(A) 申请公布日期 1999.12.07
申请号 US19920925790 申请日期 1992.08.07
申请人 CROUSE, GERALD 发明人 CROUSE, GERALD
分类号 E21B19/22;(IPC1-7):B66D1/30 主分类号 E21B19/22
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