Vertical lift assembly

摘要

A vertical lift assembly includes a framework having top, bottom, side and back plates. An upright air cylinder is mounted upon the framework and includes a reciprocal piston rod supporting a lift arm at one end and parallel to the bottom plate. A pair of upright guide rods extend between the top and bottom plates. A vertically reciprocal carriage is mounted upon said guide rods and is adapted to support a horizontally disposed workpiece gripper. An upright movable rack gear is mounted upon the carriage and an upright stationary rack gear is spaced therefrom and mounted upon said framework. A vertically reciprocal carrier includes a series of vertically spaced pinions which are in meshing engagement with said stationary rack gear and with at least a pair of said pinions at all times in meshing engagement with both of said rack gears. The other end of the lift arm is secured to the carrier whereby reciprocal movements of the piston rod and lift arm effect corresponding movements of said carrier and corresponding raising and lowering movements of said carriage.