GB2130611A - Synthetic fibre rope: monitoring strain using optical fires - Google Patents

Synthetic fibre rope: monitoring strain using optical fires Download PDF

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Publication number
GB2130611A
GB2130611A GB08233197A GB8233197A GB2130611A GB 2130611 A GB2130611 A GB 2130611A GB 08233197 A GB08233197 A GB 08233197A GB 8233197 A GB8233197 A GB 8233197A GB 2130611 A GB2130611 A GB 2130611A
Authority
GB
United Kingdom
Prior art keywords
rope
monitoring
fibres
fibre
synthetic fibre
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.)
Withdrawn
Application number
GB08233197A
Inventor
Dr A T Ratcliffe
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB08233197A priority Critical patent/GB2130611A/en
Publication of GB2130611A publication Critical patent/GB2130611A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
    • D07B1/145—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising elements for indicating or detecting the rope or cable status
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2095—Auxiliary components, e.g. electric conductors or light guides
    • D07B2201/2096—Light guides
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2301/00—Controls
    • D07B2301/25—System input signals, e.g. set points
    • D07B2301/259—Strain or elongation
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2301/00—Controls
    • D07B2301/55—Sensors
    • D07B2301/5531—Sensors using electric means or elements
    • D07B2301/554—Sensors using electric means or elements for measuring variable resistance
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2301/00—Controls
    • D07B2301/55—Sensors
    • D07B2301/5531—Sensors using electric means or elements
    • D07B2301/5577—Sensors using electric means or elements using light guides

Landscapes

  • Length Measuring Devices By Optical Means (AREA)
  • Ropes Or Cables (AREA)

Abstract

The proposed method depends on the inclusion of a number of monitoring optical plastic fibres during manufacture of the rope such that they form an integral and continuous part of its construction. Their properties are such that when subjected to the high local strains associated with internal and otherwise undetectable damage to the rope, their optical conductivity is destroyed or reduced, and this provides a warning of impairment.

Description

SPECIFICATION Strain limit indicator for monitoring internal failure in synthetic fibre ropes Synthetic fibre ropes sometimes break without warning because the early signs of failure are hidden by outer layers of braid. Breakage however does not occur in all strands simultaneously, but may be delayed for some time afterthe failure ofthe first. The proposed method of indicating high levels of local straining in individual strands could give warning of imminent ropefailure. The method depends onthe inclusion of a number of monitoring fibres (orwires) of suitable material during manufacture of the rope such that they form an integral and continuous part of its construction.The properties of these monitoring fibres are chosen in relation to the mechanical characteristics of the rope such that they break when subjected to the high local strain associated with internaldamagetostrandsorfibresofthe rope.
Indication of breakage in these monitoring fibres can be obtained either by measurement oftheir electrical resistance or by fibre optical techniques. This operation may be facilitated by connecting the fibres together at one end so that the measurement can be made from one end alone.
CLAIMS (Filed on 18th Nov., '83) 1. The inclusion of one or more plastic fibre optic cables, sheathed or unsheathed as an integral part of the construction of any type of synthetic fibre rope, for the purpose of monitoring excessive local straining in the rope as indicated by changes in the optical transmission properties of the fibre.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    SPECIFICATION Strain limit indicator for monitoring internal failure in synthetic fibre ropes Synthetic fibre ropes sometimes break without warning because the early signs of failure are hidden by outer layers of braid. Breakage however does not occur in all strands simultaneously, but may be delayed for some time afterthe failure ofthe first. The proposed method of indicating high levels of local straining in individual strands could give warning of imminent ropefailure. The method depends onthe inclusion of a number of monitoring fibres (orwires) of suitable material during manufacture of the rope such that they form an integral and continuous part of its construction.The properties of these monitoring fibres are chosen in relation to the mechanical characteristics of the rope such that they break when subjected to the high local strain associated with internaldamagetostrandsorfibresofthe rope.
    Indication of breakage in these monitoring fibres can be obtained either by measurement oftheir electrical resistance or by fibre optical techniques. This operation may be facilitated by connecting the fibres together at one end so that the measurement can be made from one end alone.
    CLAIMS (Filed on 18th Nov., '83)
    1. The inclusion of one or more plastic fibre optic cables, sheathed or unsheathed as an integral part of the construction of any type of synthetic fibre rope, for the purpose of monitoring excessive local straining in the rope as indicated by changes in the optical transmission properties of the fibre.
GB08233197A 1982-11-22 1982-11-22 Synthetic fibre rope: monitoring strain using optical fires Withdrawn GB2130611A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08233197A GB2130611A (en) 1982-11-22 1982-11-22 Synthetic fibre rope: monitoring strain using optical fires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08233197A GB2130611A (en) 1982-11-22 1982-11-22 Synthetic fibre rope: monitoring strain using optical fires

Publications (1)

Publication Number Publication Date
GB2130611A true GB2130611A (en) 1984-06-06

Family

ID=10534407

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08233197A Withdrawn GB2130611A (en) 1982-11-22 1982-11-22 Synthetic fibre rope: monitoring strain using optical fires

Country Status (1)

Country Link
GB (1) GB2130611A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194256A (en) * 1986-08-13 1988-03-02 Dr Ian Michael Hutchings Strain indication in webbing straps and ropes
EP0286711A1 (en) * 1986-05-15 1988-10-19 Spanset Inter Ag Sling for lifting loads
FR2621166A1 (en) * 1987-09-29 1989-03-31 Thomson Cgr Device and method for detecting the breakage of a cable
FR2676814A1 (en) * 1991-05-24 1992-11-27 Elf Aquitaine System for monitoring and inspecting cables by fibre optics
US5605035A (en) * 1991-08-01 1997-02-25 University Of Strathclyde Rope with strain damage indicator
DE102008026731A1 (en) * 2008-06-02 2009-12-10 Technische Universität Chemnitz Method for determining wear state of oblong tension or power transmission unit, involves detecting change of length or expansion of wave guide, where wave guide is integrated at or in tension or power transmission unit
EP2319795A3 (en) * 2009-10-16 2012-04-25 Manitowoc Crane Group France SAS Synthetic rope as carrying means for vertically lifting loads, such as for cranes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2040063A (en) * 1979-01-15 1980-08-20 Cordons Et Equipements A fibre optic cable and its method of manufacture
GB2058394A (en) * 1979-08-30 1981-04-08 Marconi Co Ltd Pressure-sensitive Optical Fibre Cable
GB2101505A (en) * 1981-06-23 1983-01-19 Standard Telephones Cables Ltd Cable manufacture
GB2107458A (en) * 1981-10-09 1983-04-27 Honda Motor Co Ltd Flexible tying member for an antitheft device
GB2109109A (en) * 1981-09-18 1983-05-25 Honda Motor Co Ltd Antitheft device
GB2109547A (en) * 1981-11-16 1983-06-02 Honda Motor Co Ltd Flexible tying member for an antitheft device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2040063A (en) * 1979-01-15 1980-08-20 Cordons Et Equipements A fibre optic cable and its method of manufacture
GB2058394A (en) * 1979-08-30 1981-04-08 Marconi Co Ltd Pressure-sensitive Optical Fibre Cable
GB2101505A (en) * 1981-06-23 1983-01-19 Standard Telephones Cables Ltd Cable manufacture
GB2109109A (en) * 1981-09-18 1983-05-25 Honda Motor Co Ltd Antitheft device
GB2107458A (en) * 1981-10-09 1983-04-27 Honda Motor Co Ltd Flexible tying member for an antitheft device
GB2109547A (en) * 1981-11-16 1983-06-02 Honda Motor Co Ltd Flexible tying member for an antitheft device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286711A1 (en) * 1986-05-15 1988-10-19 Spanset Inter Ag Sling for lifting loads
GB2194256A (en) * 1986-08-13 1988-03-02 Dr Ian Michael Hutchings Strain indication in webbing straps and ropes
GB2194256B (en) * 1986-08-13 1991-03-06 Dr Ian Michael Hutchings Improvements in and related to webbing straps and ropes
FR2621166A1 (en) * 1987-09-29 1989-03-31 Thomson Cgr Device and method for detecting the breakage of a cable
FR2676814A1 (en) * 1991-05-24 1992-11-27 Elf Aquitaine System for monitoring and inspecting cables by fibre optics
US5605035A (en) * 1991-08-01 1997-02-25 University Of Strathclyde Rope with strain damage indicator
DE102008026731A1 (en) * 2008-06-02 2009-12-10 Technische Universität Chemnitz Method for determining wear state of oblong tension or power transmission unit, involves detecting change of length or expansion of wave guide, where wave guide is integrated at or in tension or power transmission unit
EP2319795A3 (en) * 2009-10-16 2012-04-25 Manitowoc Crane Group France SAS Synthetic rope as carrying means for vertically lifting loads, such as for cranes

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)