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US 4,979,795 AGranted
Coilable torque-balanced cable and method of manufacture
AssigneeAT&T Bell Laboratories
InventorOlinda Mascarenhas
Life of this patent
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Abstract
A class of torsionally-balanced submarine cables is disclosed which are highly coilable without exhibiting the undesirable tendencies of looping and kinking of its predecessors. Coilability is achieved in part by controlling the cable's torsional stiffness to bending stiffness ratio. Use of glass-reinforced polyester tape between and over the armor wires facilitates movement of the armor wire during coiling. The teachings of the present invention apply to cables experiencing strains in the elastic range.
Claims10
An electrical cable comprising:
- a transmission core;
- armor means surrounding said core, comprising at least one layer of armor wires;
- said core and said armor means adapted to achieve a substantially torque-balanced cable structure;
- and
- said cable being characterized by a torsional stiffness to bending stiffness ratio of not more than substantially 3.
2 more elements
An undersea telecommunications cable comprising:
- an optical fiber telecommunications core;
- armor means surrounding said core, comprising first and second layers of armor wires, each layer having a lay angle of not more than substantially 10 degrees;
- and
- an extruded outer jacket surrounding said armor layers;
- said core and armor means applied so as to achieve a substantially torque-balanced cable structure;
- and
- said cable characterized by a torsional stiffness to bending stiffness ratio of not more than substantially 3.
4 more elements
Dependencies are inferred from the claim text.