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US 6,405,974 B1Granted
Ribbed core dual wall structure
OwnerF. John Herringtoninventor
Life of this patent
Estimating the term…
Abstract
An elongated composite tube made up of an inner tube 42 and an outer tube 44 (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.
Claims15
A composite tube comprising at least one axially elongated, substantially rigid inner tubular wall, at least one axially elongated, substantially rigid outer tubular wall spaced from said inner tubular wall, and a plurality of substantially rigid ribs helically disposed in the space between the inner and outer walls;
- wherein at least some of said ribs are joined to both said inner and outer walls along a sufficient portion of the axial length of said walls to maintain the spacing between said walls.
Dependencies are inferred from the claim text.