Multi-wall cylindrical structure, method of making such structure, and apparatus for carrying out such method

摘要

An elongated composite tube made up of an inner tube 42 and an outer tube 44 (see FIG. 3 ) with a plurality of elongated helical ribs disposed between the inner tube and the outer tube in a supporting relationship to both. A slinky like toy made from the composite tube is also disclosed, as is a method of making both.