Expansible shaft for roll core
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United States of America Patent
Stats
-
Aug 29, 1995
Issued Date -
N/A
app pub date -
Oct 5, 1994
filing date -
Jun 15, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
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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