Flame resistant optical fiber cable with optical fibers loosely enclosed in tubes
First Claim
Patent Images
1. An optical fiber cable comprising:
- a central member;
at least one substantially fluid impervious tube wound around said central member;
a plurality of optical fibers loosely received in said tube;
a sheath of plastic material encircling said tube which is around said central member, said plastic material having a predetermined flame propagating value which prevents flame propagation upon combustion of the sheath, greater than a predetermined value;
a thermal barrier layer encircling said tube and said central member and intermediate said tube and said sheath, said thermal barrier layer being electrically non-conductive and being non-combustible when subjected to the flame and the heat of combustion of said sheath;
a water blocking material in any otherwise empty spaces in said tube and between said thermal barrier layer and said tube, said water blocking material permitting said optical fibers to move with respect to said tube and permitting said tube to move with respect to said thermal barrier layer and to said central structural member.
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Abstract
An optical fiber cable which is flame resistant and suitable for both indoor and outdoor use, which includes a central strength member, a fluid impervious tube wound around the strength member, a plurality of optical fibers loosely received in the tube, a sheath of plastic material encircling the tube and the central member, a thermal barrier layer intermediate the tube and the sheath and encircling the tube and the central member to protect the elements inwardly of the heat barrier from heat and flame external to the barrier layer and a water blocking material in any otherwise empty spaces within the tube and between the barrier layer and the tube.
68 Citations
26 Claims
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1. An optical fiber cable comprising:
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a central member; at least one substantially fluid impervious tube wound around said central member; a plurality of optical fibers loosely received in said tube; a sheath of plastic material encircling said tube which is around said central member, said plastic material having a predetermined flame propagating value which prevents flame propagation upon combustion of the sheath, greater than a predetermined value; a thermal barrier layer encircling said tube and said central member and intermediate said tube and said sheath, said thermal barrier layer being electrically non-conductive and being non-combustible when subjected to the flame and the heat of combustion of said sheath; a water blocking material in any otherwise empty spaces in said tube and between said thermal barrier layer and said tube, said water blocking material permitting said optical fibers to move with respect to said tube and permitting said tube to move with respect to said thermal barrier layer and to said central structural member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification