Cable reinforcement for an optical fiber cable

{
  "publication_number": "US5016973A",
  "country": "US",
  "kind": "A",
  "title": "Cable reinforcement for an optical fiber cable",
  "abstract": "The invention provides for a dielectric optical fiber cable reinforced by a yarn made by spinning synthetic staple fibers around a glass core. The optical fibers are sheathed by the yarn reinforced glass core and then enclosed in a polyethylene jacket. When heated, the yarn fuses with the polyethylene jacket forming a rigid cable member.",
  "claims": [
    "1. An optical cable member comprising at least one optical fiber wrapped with a sheath of yarn, said yarn consisting of a core member encased with spun synthetic staple fibers and an outer jacket surrounding said yarn wrapped optical fiber.",
    "2. The optical cable of claim 1, wherein said core member of said yarn consists of a glass member.",
    "3. The optical cable of claim 1, wherein said yarn is composed of aramid fibers.",
    "4. The optical cable of claim 1, wherein said yarn is composed of a thermosetting material.",
    "5. The optical cable of claim 1, wherein said yarn consists of polyester staple fibers spun over glass fibers.",
    "6. The optical cable of claim 5, wherein said outer jacket is further composed of polyethylene.",
    "7. The optical cable of claim 1, wherein said outer jacket is composed of polyethylene.",
    "8. A dielectric cable member comprising a core member wrapped in a sheath of yarn, said yarn consisting of a glass fiber encased with spun synthetic staple fibers and an outer jacket surrounding said yarn wrapped core member.",
    "9. The cable member of claim 8, wherein said core member includes at least one optical fiber.",
    "10. The cable member of claim 8, wherein said yarn is composed of polyester staple fibers spun over said glass fiber.",
    "11. The cable member of claim 10, wherein said outer jacket is further composed of polyethylene.",
    "12. The cable member of claim 8, wherein said outer jacket is composed of a thermosetting material.",
    "13. An optical cable member comprising at least one optical fiber wrapped with a sheath of yarn, said yarn consisting of a glass core member encased with synthetic staple fibers, and an outer jacket composed of polyurethane surrounding said yarn wrapped optical fiber.",
    "14. The cable member of claim 13, wherein said synthetic staple fibers are composed of a thermosetting material, whereby said cable member is flexible until application of heat to said cable member to melt said synthetic staple fibers and said polyurethane, thereby providing a blended outer sheath surrounding said optical fiber which, upon cooling, stiffens to produce a non-flexible cable member."
  ],
  "description_excerpt": "This invention relates to fiber optic cables and the structure for reinforcing the tensile and compressive strength characteristics of the optical fibers contained within the fiber optic cables. Specifically, the invention is directed toward an improved structure for use in low fiber-count cable construction.\n\nIt is well known that small, light-transmitting optical fibers are mechanically fragile and exhibit poor strength characteristics. Typically, fiber optic cables which are intended for use in outside environments are designed for long-haul applications and such cables, therefore, have a medium to high fiber-count. Such long-haul cables are relatively rigid and have a relatively large bending radius as a result of the high fiber-count and resulting cable structure. These long-haul type cables are undesirable for use in short-haul applications where local distribution type networks typically require fiber optic cables having great flexibility and low fiber counts. A requirement of such short-haul local distribution fiber optic cables is that the cable be greatly flexible and have a small bending radius so that it is useable in a variety of environments.\n\nThe challenge of providing a low count fiber optic cable having desirable flexibility, small bending radius, as well as appropriate tensile and compressive strength characteristics has produced a large variety of cable structures. For instance, U.S. Pat No. 4,723,831 provides a cable construction consisting of optical fibers centrally located within an overwrap.",
  "cpc": [
    "G02B 6/4432"
  ],
  "ipc": [
    "G02B 6/44"
  ],
  "assignees": [
    "Owens Corning Fiberglas Corp"
  ],
  "inventors": [
    "Thomas P. Hager",
    "Ralph S. Dale"
  ],
  "filing_date": "1989-08-25",
  "publication_date": "1991-05-21",
  "grant_date": "1991-05-21",
  "priority_date": "1989-08-25",
  "application_number": "US-39886189-A",
  "family_id": "23577086",
  "cited_by_count": 27,
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}