An elongated tube has a high pressure feed line on one end and an impact head on the other end. A tube intermediate the ends of the tool houses two cylinders having one piston is in each cylinder. The two pistons are tied together by a piston rod extending through a bulkhead dividing the two coaxially aligned cylinders.
申请公布号
US5934386(A)
申请公布日期
1999.08.10
申请号
US19980110779
申请日期
1998.07.06
申请人
COLUMBIA GAS DISTRIBUTION COMPANIES
发明人
PRATER, JR., GLEN;HNAT, WILLIAM P.;COLLINS, ROBERT L.;WANG, SONGNIAN