Patent ID: 6026970
Filing Date: 2000-02-22
Classification: B66C,Y10T

Abstract:
A telescoping tube assembly comprising:a first longitudinal tube section;a second longitudinal tube section disposed within the first longitudinal tube section and adapted for telescoping motion into and out of the first longitudinal tube section;a third longitudinal tube section disposed within the second longitudinal tube section and adapted for telescoping motion into and out of the second longitudinal tube section;a drive assembly comprising:a first threaded screw joined to the first longitudinal tube section;a first nut joined to the second longitudinal tube section to move therewith and operably coupled to the threads of the first threaded screw;a second threaded screw joined to the second longitudinal tube section to move therewith;a second nut joined to the third longitudinal tube section to move therewith and operably coupled to the threads of the second threaded screw; anda drive motor joined to the second longitudinal tube section to move therewith and to rotate the first nut and the second threaded screw.