Patent ID: 7770635

Claim:
A well tubular handling system, comprising: a vertically movable power drive assembly for providing rotary movement in a well device; a longitudinally extending power drive output shaft rotatably turned about a longitudinal axis of the power drive output shaft by the power drive assembly and movable vertically therewith; a pipe gripping mechanism having a die on a lower end selected to grip and rotate an end of a well tubular; a tubular handling torque multiplier connected between the power drive output shaft and the pipe gripping mechanism and communicating rotational drive from the power drive output shaft to the pipe gripping mechanism, the tubular handling torque multiplier including gears for causing a rotational speed of the pipe gripping mechanism to be less than or greater than that of the power drive output shaft; wherein the torque multiplier has an input shaft connected by threads to the power drive output shaft so that weight supported by the pipe gripping mechanism passes through the input shaft of the torque multiplier to the power drive output shaft; the torque multiplier has an output shaft for driving the pipe gripping mechanism; the input and output shafts of the torque multiplier having passages therethrough; and wherein the passages are in sealing engagement with each other to enable fluid to be transmitted through the torque multiplier without contact with the gears.