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US 4,540,130 AGranted
Drum for winding filamentary material
AssigneeCSELT - Centro Studi e Laboratori Telecomunicazioni S.p.A.
InventorGiorgio Grego
Life of this patent
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Abstract
A drum for winding up filamentary material, such as optical fibers, has a generally cylindrical unitary flangeless hollow body of airtight and somewhat resilient polymeric material inflated under a fractional gauge pressure through a valve in one of its end walls. A bore in each end wall, centered on the cylinder axis, enables the drum to be coupled with a driving mechanism.
Claims3
In an apparatus for winding up glass filaments and tensionally testing same, the improvement which comprises:
- a generally cylindrical unitary drum constituted as an inflatable envelope of airtight polymeric material centered on an axis and having:
- thin cylindrical peripheral walls coaxially surrounding said axis,
- a pair of relatively thick end walls lying in planes perpendicular to said axis and spaced apart along said axis with said peripheral wall located between them, and
- convex annular transition zones merging each of said end walls into said peripheral wall;
- respective coaxial formations on said end walls;
- respective shafts connected to said formations for rotatably supporting said drum and driving same in rotation about said axis;
- and
- valve means on one of said end walls for maintaining a selected internal pressure within said drum in excess of ambient pressure for entrainment of said filaments to draw them onto said drum.
5 more elements
Dependencies are inferred from the claim text.