US 5,441,780 AGranted

Paper tube with integral end supports

AssigneeJefferson Smurfit Corporation

InventorsVictor Bushell, Robert Dissen

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Abstract

A paper tube and method of making the same, having plastic end ring supports and a uniform inside diameter and uniform outside diameter, end-to-end, including the supports. The tube is formed from a multiple ply paper wall. A poly-coated ply is formed at the midpoint of the wall thickness. An annular cut is made interiorly within each end to the poly-coated ply midpoint. A section of wall defined by the cut is removed creating an annular rabbet within each end. An end support ring is inserted in each end. The ring has a body section with an outside diameter equal to the outside diameter of the tube and an inside diameter equal to the inside diameter of the tube. An annular collar extends from one side of the ring body. The collar has an outside diameter equal to the inside diameter of the rabbet. The collar seats in the rabbet and the body abuts the end of the tube resulting in a tube having uniform outside diameter and uniform inside diameter, end-to-end, including the support rings.

Claims1

Dependent claims

A paper tube comprising:

an elongated hollow tube section having a first end and second end, each said end having an annular rabbet formed therein;
a first end support ring having a body section and an integral concentric collar section extending from said body section, said collar section seated on said rabbet at said first end of said tube;
a second end support ring having a body section and an integral concentric collar section extending from said body section, said collar section seated on said rabbet formed at said second end of said tube section;
said tube section being comprised of a wound paper wall, forming the tube, said wall having a poly-coated ply provided at its mid-point therein and said poly-coated ply arranged at said mid-point of said paper tube and located in alignment within said tube at the depth of said formed rabbet provided within each said end of said elongated hollow tube section;
each said end support ring body having an outside diameter equal to an outside diameter of said tube section, each said collar having an outside diameter equal to the inside diameter of said rabbet, and each said ring having a bore formed therethrough, said bore having an inside ! diameter equal to the inside diameter of said tube section, wherein said end support rings are formed from high impact plastic;
the combination paper tube and end support rings having uniform inside diameter, from end-to-end, and a uniform outside diameter from end-to-end, including the said end support rings thereon, and said end support rings being seated interiorly of the rabbeted tube.

3 more elements

Dependencies are inferred from the claim text.