Patent ID: 9073737
Filing Date: 2015-07-07
Classification: B66F

Abstract:
1. An apparatus for lifting a workpiece, the apparatus comprising: an upright frame; a lead screw supported by the frame for selective rotation; a carrier threadingly engaging the lead screw, the carrier comprising wherein rotation of the lead screw in one rotational direction linearly advances the carrier in a lifting direction and rotation of the lead screw in the opposite rotational direction linearly advances the carrier in a lowering direction; a mechanical power inlet adapted for receiving an input torque from a user; and a mechanical power transmission having a first gear fixed in rotation with the mechanical power inlet and a different second gear fixed in rotation with the lead screw, the first and second gears sized so that the input torque imparted on the first gear is less than an output torque imparted by the second gear to the lead screw.