Rod break-out and make-up tool

Details Rod break-out and make-up tool Rod break-out and make-up tool

E - Fixed Constructions

21

B

255/14.7

E21B 19/16 (2006.01)

Patent

CA 1151145

ROD BREAK-OUT AND TAKE-UP TOOL ABSTRACT OF THE DISCLOSURE A rod break-out and make-up tool for screwing and un- screwing drill rods that includes a lower clamp assembly hav- ing a jaw holder that has trunnions pivotally mounted on a mounting frame, and piston cylinder combinations pivotally mounted by the jaw holder for moving jaws divergingly upwardly to a rod release position and convergingly downwardly to a rod clamping position, a high-low drive assembly having a housing that rotatably mounts a spindle that has drive lugs, a lower ring gear fixed to the spindle and driven at a high speed, low torque by a reversible hydraulic motor, an upper ring gear ro- tatable on the spindle and driven by a piston cylinder combin- ation operated rack, a ratchet assembly for transmitting a driving force from the upper gear to the lower gear in one angular direction and permitting the lower gear rotating rela- tive thereto in said one direction, legs pivotally mounted on the trunnions for supporting the drive assembly, and adjust- ment mechanism connected between the frame and the housing for retaining the housing in selected adjusted pivoted positions; and an upper clamp assembly having an annular piston combina- tion for moving jaws radially inwardly to a rod clamping posi- tion, a driven member driven by said lugs and axially movable relative thereto for rotating said mechanism, and a coil spring between the upper clamp assembly and a ring joined to said lugs to permit self centering or the upper clamp assembly and support the upper clamp assembly.

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