SE324547BSE334866ASE334866ASE324547BSE 324547 BSE324547 BSE 324547BSE 334866 ASE334866 ASE 334866ASE 334866 ASE334866 ASE 334866ASE 324547 BSE324547 BSE 324547B
Authority
SE
Sweden
Application number
SE334866A
Inventor
R Edwards
Original Assignee
Gardner Denver Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gardner Denver CofiledCriticalGardner Denver Co
Publication of SE324547BpublicationCriticalpatent/SE324547B/xx
E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
E21B19/086—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with a fluid-actuated cylinder