Expansible shaft for roll core

Details Expansible shaft for roll core Expansible shaft for roll core

1994-10-05

1995-08-29

Darling, John P.

Winding, tensioning, or guiding

Coil holder or support

Radially expansible or contractile

B65H 7524

Patent

active

054453429

ABSTRACT:
An elongate expansible shaft for a roll core has a peripheral surface defining multiple separate elongate slots helically intertwined and oriented at a pitch angle no greater than about 30.degree. measured from a longitudinal axis. Each slot is T-shaped in cross section and contains a respective separate, elongate, resilient bladder pneumatically expandable into frictional engagement with the core. The bladder has a unitary construction with hinge portions for minimizing the loss of force due to expansion of the bladder. An air inlet fitting is inserted in one end of each bladder and is independently connected to a respective separate valve for preventing the escape of air from the bladder irrespective of the air pressure in any other bladder.

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