发明名称 Well pipe extraction apparatus
摘要 A well pipe extraction apparatus for removing a groundwater monitoring well consisting of PVC pipe from the ground. The well pipe extraction apparatus includes a wire rope, a soft eye formed at an upper end of the wire rope and knurled brass rod attached to the opposite end of the wire rope. The knurled brass rod is lowered to the bottom end of the well casing. An operator pours sand particles down the well casing. The sand particles wedge in-between groves within the brass rod and the interior surface of the well casing locking brass rod to the well casing which allows the operator to extract the PVC pipe from the ground.
申请公布号 US2003106691(A1) 申请公布日期 2003.06.12
申请号 US20010006776 申请日期 2001.12.07
申请人 OSGOOD JAMES E.;MAJOR WILLIAM R. 发明人 OSGOOD JAMES E.;MAJOR WILLIAM R.
分类号 E21B31/20;(IPC1-7):E21B31/12 主分类号 E21B31/20
代理机构 代理人
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