Patent ID: 6082207
Filing Date: 2000-07-04
Classification: F16H,Y10T

Abstract:
A vertically operating, vertical position shiftable ball screw and nut actuator system for synchronously moving a pair of separate loads of generally like magnitude in opposite directions including:a. an axially restrained vertically disposed rotatable ball screw having screw thread sections of opposite hand, each of said screw sections having helical groove portions separated by land portions;b. a pair of recirculating ball nuts each mounted on one of said screw sections, and a weighted member connected to each nut to impose one of said loads vertically on one of said pair of ball nuts and the other of said loads vertically on the other ball nut of said pair, each nut having unbroken helical thread portions helically complemental to the respective screw section on which said nut is mounted to form a ball receiving raceway there between;c. a train of load bearing balls in each of said raceways causing said ball nuts to move in opposing directions upwardly and downwardly upon rotation of said screw in either direction;d. a shiftable mount system for journaling the upper and lower ends of said screw movably supporting said screw to permit an adjustment of the screw to various positions in vertical axial orientation to compensate for load misalignment problems; ande. a rotary drive transmitter connected to said screw for driving said screw in rotation in either direction and moving said nuts and loads in a generally counterbalanced relationship in opposite vertical directions.