Patent ID: 6443516
Filing Date: 2002-09-03
Classification: B60P,Y10T

Abstract:
A cableless extendable and retractable support system for raising and lowering a structure which comprises:a base; a structure to be raised and lowered relative to the base; a plurality of telescopic assemblies coupled between the base and structure to be raised and lowered; a plurality of spring elements having first and second ends with second ends thereof coupled to the plurality of telescopic assemblies; and a lift tube assembly coupled to first ends of each of the plurality of spring elements, the lift tube assembly including a mechanism which, when activated, selectively extends or retracts each of the plurality of spring elements therefrom, said mechanism including a gear mechanism which allows the plurality of spring elements to be selectively extended or retracted without the use of a cable system, and a housing which encloses the entire mechanism that extends and retracts the plurality of spring elements.