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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
E21B19/081—Screw-and-nut feed mechanisms
B—PERFORMING OPERATIONS; TRANSPORTING
B26—HAND CUTTING TOOLS; CUTTING; SEVERING
B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
Ensemble a vis a billes comportant une unite a cannelures a billes pour commander une avance lente et precise et mecanisme de transmission de force motrice muni d'un tel ensemble a vis a billes