| 摘要 |
An extendable and retractable support system for raising and lowering structures, including covers or tops of mobile and immobile dwellings which includes a plurality of telescopic assemblies. The telescopic assemblies include at least two tube members that are provided with enclosed sides and a centrally located internal channel structure that is parallel to and proximal to a center of the tube members, though which internal channel structures one of a plurality of spring elements extends. A mechanism extends and retracts the spring elements thereby causing the telescopic assemblies to extend and retract.
|
