Drill pipe coupling tool

Details Drill pipe coupling tool Drill pipe coupling tool

E - Fixed Constructions

21

B

255/14.3

E21B 3/02 (2006.01) E21B 19/084 (2006.01) E21B 19/20 (2006.01)

Patent

CA 1232265

ABSTRACT OF THE DISCLOSURE A mechanism for reversibly moving a rotary drill pipe drive mechanism longitudinally of a support mast, having a base and a crown, of an earth drilling apparatus comprises at least one hydraulic cylinder, having an extendable and retractable member, secured to the base of the mast and extending longitudinally of the mast, a pulley assembly secured to a free end of the member and having first and second pulley, a first cable having one end secured to the base, the other end secured to the drive mechanism and trained about one of the pulleys whereby when the member is extended by hydraulic pressurization of the hydraulic cylinder, the drive mechanism is moved along the mast away from the base, and a second cable having one end secured to the crown, the other end connected to the drive mechanism, and being trained about the other of the pulleys of the pulley assembly, a first idler pulley secured to the crown and a second idler pulley secured to the base whereby when the member is retracted by hydraulic pressurization of the hydraulic cylinder, the drive mechanism is moved alone the mast toward the base.

508328

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