Crush-proof extrusion core

Details Crush-proof extrusion core Crush-proof extrusion core

1995-09-22

1997-09-23

Jillions, John M.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

B65H 7510

Patent

active

056695780

ABSTRACT:
A core includes coaxial inner and outer tubes having a plurality of ribs extending therebetween defining a plurality of empty pockets. The inner tube has a thickness which is at least as large as the thickness of the outer tube for increasing crushing resistance of the core. In a preferred embodiment, each of the pockets includes four corners having a radius greater than the thicknesses of the inner or outer tubes or both.

REFERENCES:
patent: 3447674 (1969-06-01), Fraser
patent: 3627220 (1971-12-01), Vogel
patent: 4083508 (1978-04-01), Pattillo
patent: 5252369 (1993-10-01), Akao et al.
patent: 5513820 (1996-05-01), Meyer

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