GB2090995A - Pressure-resistant Cable Strength Member - Google Patents

Pressure-resistant Cable Strength Member Download PDF

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Publication number
GB2090995A
GB2090995A GB8100977A GB8100977A GB2090995A GB 2090995 A GB2090995 A GB 2090995A GB 8100977 A GB8100977 A GB 8100977A GB 8100977 A GB8100977 A GB 8100977A GB 2090995 A GB2090995 A GB 2090995A
Authority
GB
United Kingdom
Prior art keywords
tubular member
wires
cable
stranded
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8100977A
Other versions
GB2090995B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB8100977A priority Critical patent/GB2090995B/en
Priority to AU78636/81A priority patent/AU547360B2/en
Priority to FR8200412A priority patent/FR2498001A1/en
Priority to JP57002906A priority patent/JPS5924612B2/en
Priority to ES1982262573U priority patent/ES262573Y/en
Publication of GB2090995A publication Critical patent/GB2090995A/en
Application granted granted Critical
Publication of GB2090995B publication Critical patent/GB2090995B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4415—Cables for special applications
    • G02B6/4427—Pressure resistant cables, e.g. undersea cables

Abstract

A communication cable to be used in a hostile environment needs to be protected from that environment, this being especially the case for an optical fibre cable for use in submarine conditions. To provide such protection, an optical fibre package, which may include one or more optical fibres is layed within a hollow tubular member which acts as a pressure-resistant and load-carrying member. This member is made from at least one layer of stranded wires, which layer may include alternate round cross-section wires (1) and waisted cross-section wires (2). The fibre package is in the central tunnel (3), and may be of such length relative to the tubular member as to be slack. It is noted that other cross-sections for the wires can be used as long as each layer is a complete tube, and that adjacent wire layers can be wound helically with opposite lays. <IMAGE>

Description

SPECIFICATION Cable Strength Member This invention relates to a pressure-resistant and load-carrying tubular member, such as may be used to carry a communication cable, such as an optical fibre package.
Where a communication cable is required to withstand a hostile environment, e.g. when it is a submarine cable, it is usual to provide the cable with strength members so that the cable proper is not subject to excessive strain. Although this may be important in the case of metallic conductors, it is even more important in the case of optical fibres.
An object of the invention is to provide such a tube for use in conjunction with a communication cable, such as (but not limited to) an optical fibre cable package.
According to the invention there is provided a pressure-resistant load-carrying tubular member, for use for supporting a communication cable which includes at least one stranded layer formed of adjacently-arranged wires stranded together to form a substantially complete hollow tubular member, the internal cross-section of the tubular member being such as to accommodate the cable to be supported.
According to the invention there is also provided a pressure-resistant load-carrying tubular member, for use for supporting a communication cable such as an optical fibre package, which includes at least one stranded layer formed of alternately-arranged roundsection and waisted-section wires stranded together to form a substantially complete hollow tubular member, the internal cross-section of the tubular member being such as to accommodate the cable to be supported.
An embodiment of the invention will now be described with reference to the accompanying drawing, which is a cross-section of a tubular member embodying the invention.
The drawing shows a tube made up of two layers each of which consists of alternatelyarranged round-section wires such as 1 and waisted-section wires such as 2. With a suitable cross-section for the waisted wires, which as shown differ for the two layers, each layer when stranded up, is a substantially complete cylinder.
The tubular member thus formed has a hollow central tunnel 3 which extends throughout its length in which the cable to be supported is received.
It will be appreciated that the layers of wires used to form the cylinder could have other cross sections, but the arrangements shown are the preferred ones. Further, the layers can each have their wires arrangement helically, the wires then being given alternate left-hand and right-hand lays. This results in the tube thus produced being a torsionally-balanced strand.
When the tubular member is used to support and contain an optical fibre package, which may contain one or more optical fibres, the fibre or fibres may be so arranged as to be slack. That is the fibres are each somewhat longer than the tubular member to ensure that they are not subjected to any strain.
The outer-layer may be surrounded by one or more layers of water-resistant material, if desired.
Claims
1. A pressure-resistant load-carrying tubular member, for use for supporting a communication cable, which includes at least one stranded layer formed of adjacently-arranged wires stranded together to form a substantially complete hollow tubular member, the internal cross-section of the tubular member being such as to accommodate the cable to be supported.
2. A pressure-resistant load-carrying tubular member, for use for supporting a communication cable such as an optical fibre package, which includes at least one stranded layer formed of alternately-arranged round-section and waistedsection wires stranded together to form a substantially complete hollow tubular member, the internal cross-section of the tubular member being such as to accommodate the cable to be supported.
3. A member as claimed in claim 1 or 2, and which has at least two layers of stranded wires.
4. A member as claimed in claim 3, and in which adjacent layers of stranded wires have their wires arranged helically with opposite lays.
5. A pressure-resistant loadcarrying tubular member, for use for supporting a communication cable, substantially as described with reference to the accompanying drawing.
New Claims or Amendments to Claims filed on 21 May1981 Superseded Claims New Claims: 6. A pressure-resistant load-carrying member for use for supporting an optical fibre cable package, which member includes two stranded layers each formed of alternately-arranged roundsection and waisted-section trapezoidal wires stranded together to form a complete hollow tubular member, in which the round-section wires in the two layers are staggered with respect to each other, and in which the internal crosssection of the inner one of said two tubular members is such as to accommodate the optical fibre cable package to be supported.
7. A member as claimed in claim 6, and in which adjacent layers of said stranded wires have their wires arranged helically with opposite lays.
8. A submarine optical fibre cable which includes a pressure-resistant load-carrying member as claimed in any one of claims 1 to 7, and an optical fibre cable package inside the hollow layer or the innermost hollow layer.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Cable Strength Member This invention relates to a pressure-resistant and load-carrying tubular member, such as may be used to carry a communication cable, such as an optical fibre package. Where a communication cable is required to withstand a hostile environment, e.g. when it is a submarine cable, it is usual to provide the cable with strength members so that the cable proper is not subject to excessive strain. Although this may be important in the case of metallic conductors, it is even more important in the case of optical fibres. An object of the invention is to provide such a tube for use in conjunction with a communication cable, such as (but not limited to) an optical fibre cable package. According to the invention there is provided a pressure-resistant load-carrying tubular member, for use for supporting a communication cable which includes at least one stranded layer formed of adjacently-arranged wires stranded together to form a substantially complete hollow tubular member, the internal cross-section of the tubular member being such as to accommodate the cable to be supported. According to the invention there is also provided a pressure-resistant load-carrying tubular member, for use for supporting a communication cable such as an optical fibre package, which includes at least one stranded layer formed of alternately-arranged roundsection and waisted-section wires stranded together to form a substantially complete hollow tubular member, the internal cross-section of the tubular member being such as to accommodate the cable to be supported. An embodiment of the invention will now be described with reference to the accompanying drawing, which is a cross-section of a tubular member embodying the invention. The drawing shows a tube made up of two layers each of which consists of alternatelyarranged round-section wires such as 1 and waisted-section wires such as 2. With a suitable cross-section for the waisted wires, which as shown differ for the two layers, each layer when stranded up, is a substantially complete cylinder. The tubular member thus formed has a hollow central tunnel 3 which extends throughout its length in which the cable to be supported is received. It will be appreciated that the layers of wires used to form the cylinder could have other cross sections, but the arrangements shown are the preferred ones. Further, the layers can each have their wires arrangement helically, the wires then being given alternate left-hand and right-hand lays. This results in the tube thus produced being a torsionally-balanced strand. When the tubular member is used to support and contain an optical fibre package, which may contain one or more optical fibres, the fibre or fibres may be so arranged as to be slack. That is the fibres are each somewhat longer than the tubular member to ensure that they are not subjected to any strain. The outer-layer may be surrounded by one or more layers of water-resistant material, if desired. Claims
1. A pressure-resistant load-carrying tubular member, for use for supporting a communication cable, which includes at least one stranded layer formed of adjacently-arranged wires stranded together to form a substantially complete hollow tubular member, the internal cross-section of the tubular member being such as to accommodate the cable to be supported.
2. A pressure-resistant load-carrying tubular member, for use for supporting a communication cable such as an optical fibre package, which includes at least one stranded layer formed of alternately-arranged round-section and waistedsection wires stranded together to form a substantially complete hollow tubular member, the internal cross-section of the tubular member being such as to accommodate the cable to be supported.
3. A member as claimed in claim 1 or 2, and which has at least two layers of stranded wires.
4. A member as claimed in claim 3, and in which adjacent layers of stranded wires have their wires arranged helically with opposite lays.
5. A pressure-resistant loadcarrying tubular member, for use for supporting a communication cable, substantially as described with reference to the accompanying drawing.
New Claims or Amendments to Claims filed on 21 May1981 Superseded Claims New Claims:
6. A pressure-resistant load-carrying member for use for supporting an optical fibre cable package, which member includes two stranded layers each formed of alternately-arranged roundsection and waisted-section trapezoidal wires stranded together to form a complete hollow tubular member, in which the round-section wires in the two layers are staggered with respect to each other, and in which the internal crosssection of the inner one of said two tubular members is such as to accommodate the optical fibre cable package to be supported.
7. A member as claimed in claim 6, and in which adjacent layers of said stranded wires have their wires arranged helically with opposite lays.
8. A submarine optical fibre cable which includes a pressure-resistant load-carrying member as claimed in any one of claims 1 to 7, and an optical fibre cable package inside the hollow layer or the innermost hollow layer.
GB8100977A 1981-01-13 1981-01-13 Pressure-resistant cable strength member Expired GB2090995B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB8100977A GB2090995B (en) 1981-01-13 1981-01-13 Pressure-resistant cable strength member
AU78636/81A AU547360B2 (en) 1981-01-13 1981-12-18 A cable strength member
FR8200412A FR2498001A1 (en) 1981-01-13 1982-01-13 REINFORCING ELEMENT OF A CABLE, IN PARTICULAR A FIBER OPTIC COMMUNICATION CABLE
JP57002906A JPS5924612B2 (en) 1981-01-13 1982-01-13 Pressure-resistant load-supporting tubular member
ES1982262573U ES262573Y (en) 1981-01-13 1982-01-13 A TUBULAR ELEMENT RESISTANT TO PRESSURE AND THAT CAN CARRY A WEIGHT.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8100977A GB2090995B (en) 1981-01-13 1981-01-13 Pressure-resistant cable strength member

Publications (2)

Publication Number Publication Date
GB2090995A true GB2090995A (en) 1982-07-21
GB2090995B GB2090995B (en) 1984-06-06

Family

ID=10518950

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8100977A Expired GB2090995B (en) 1981-01-13 1981-01-13 Pressure-resistant cable strength member

Country Status (5)

Country Link
JP (1) JPS5924612B2 (en)
AU (1) AU547360B2 (en)
ES (1) ES262573Y (en)
FR (1) FR2498001A1 (en)
GB (1) GB2090995B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165662A (en) * 1984-10-08 1986-04-16 Ass Elect Ind Optical cable
GB2199961A (en) * 1987-01-13 1988-07-20 Stc Plc Optical fibre cable containing non circular cross section wires
WO1990006530A1 (en) * 1988-12-05 1990-06-14 Kupferdraht-Isolierwerk Ag Wildegg Self-supporting optical cable

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA834876B (en) * 1982-07-19 1984-03-28 Bicc Plc Flexible elongate body

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1071556A (en) * 1953-02-27 1954-09-02 Silec Liaisons Elec Closed metal cable, providing an electrical connection
FR1409686A (en) * 1964-09-29 1965-08-27 English Electric Co Ltd Lifting cable
CA1112310A (en) * 1977-05-13 1981-11-10 Peter Fearns Overhead electric transmission systems
FR2444282A1 (en) * 1978-12-12 1980-07-11 Cables De Lyon Geoffroy Delore UNDERWATER CABLE WITH OPTICAL FIBERS FOR TELECOMMUNICATIONS, AND METHOD AND DEVICE FOR THE PRODUCTION THEREOF

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165662A (en) * 1984-10-08 1986-04-16 Ass Elect Ind Optical cable
GB2199961A (en) * 1987-01-13 1988-07-20 Stc Plc Optical fibre cable containing non circular cross section wires
US4915490A (en) * 1987-01-13 1990-04-10 Stc Plc Optical fibre cable with crush-resistant tube
GB2199961B (en) * 1987-01-13 1990-09-26 Stc Plc Optical fibre cable containing non-circular cross section wires.
WO1990006530A1 (en) * 1988-12-05 1990-06-14 Kupferdraht-Isolierwerk Ag Wildegg Self-supporting optical cable
US5044722A (en) * 1988-12-05 1991-09-03 Kupferdraht-Isolierwerk Ag Self-supporting optical cable

Also Published As

Publication number Publication date
ES262573U (en) 1983-01-01
JPS5924612B2 (en) 1984-06-11
FR2498001A1 (en) 1982-07-16
AU547360B2 (en) 1985-10-17
GB2090995B (en) 1984-06-06
AU7863681A (en) 1982-07-22
JPS57138809A (en) 1982-08-27
ES262573Y (en) 1983-07-01

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PCNP Patent ceased through non-payment of renewal fee