Vertically operating ball screw and nut actuator system for synchronously moving multiple elements in load balanced opposed directions, and methods of constructing and operating ball screw actuator systems

摘要

A loaded vertically operating ball screw and nut actuator system, including methods of constructing it, for synchronously moving load systems connected to it in opposite vertical directions has a vertically disposed rotatably driven ball screw device with screw sections of opposite hand. A complemental recirculating ball nut discretely connected to each of the load systems is threaded on each screw section to form ball receiving raceways for trains of load bearing balls which cause the ball nuts to move in opposing directions upon rotation of the screw in either direction. The load systems move in counterbalanced relation under the influence of gravity. A mount system for the upper and lower ends of the screw permits an off-axis adjustment in axial orientation of the screw to compensate for load misalignment problems.