Expansible shaft for roll core
US5372331A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1993 |
| Grant date | Dec 13, 1994 |
| Priority date | — |
| Expiry date | Jun 15, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H75/2437
- WIPO fieldHandling
- WIPO sectorMechanical engineering
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 T-shaped 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.