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US 4,247,289 AGranted
Paper spring method
OwnerJames E. McCabeinventor
Life of this patent
Estimating the term…
Abstract
A paper spring is formed by longitudinally folding a sheet along parallel fold lines to provide a strip and thence transversely folding the strip in a zigzag manner. The resulting paper spring may be contained in a paper housing in the form of an open-sided rectangular band and a series of the resulting paper spring units may be mounted on a carboard panel to provide a platen. Such springs or units provide a resilient cushion for fragile items shipped in boxes.
Claims4
A method of providing paper springs for cushioning articles to be shipped, including the steps of:
- (a) longitudinally folding a sheet of paper along a plurality of fold lines parallel to one edge in the same direction to provide a strip of folded paper of length equal to the length of said one edge and of a given width, the folded configuration as viewed from one end of the strip defining a flattened spiral;
- and
- (b) transversely folding said strip in a zigzag accordion manner back and forth in successively opposite directions along a series of parallel fold lines transverse to said length of the strip whereby the end portions of the first and last transverse folds are biased apart by the tendency of the transverse accordion folds to spring apart.
Dependencies are inferred from the claim text.