WO2009087007A1 - Tool for access to optical fibres - Google Patents

Tool for access to optical fibres Download PDF

Info

Publication number
WO2009087007A1
WO2009087007A1 PCT/EP2008/067146 EP2008067146W WO2009087007A1 WO 2009087007 A1 WO2009087007 A1 WO 2009087007A1 EP 2008067146 W EP2008067146 W EP 2008067146W WO 2009087007 A1 WO2009087007 A1 WO 2009087007A1
Authority
WO
WIPO (PCT)
Prior art keywords
recess
tool
cable
tool according
longitudinal axis
Prior art date
Application number
PCT/EP2008/067146
Other languages
French (fr)
Inventor
Arnaud Le Dissez
Alessandro Pirri
Original Assignee
Prysmian S.P.A.
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 Prysmian S.P.A. filed Critical Prysmian S.P.A.
Priority to ES08869848.5T priority Critical patent/ES2457274T3/en
Priority to EP08869848.5A priority patent/EP2227710B1/en
Priority to US12/811,370 priority patent/US20110010944A1/en
Publication of WO2009087007A1 publication Critical patent/WO2009087007A1/en

Links

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
    • G02B6/24—Coupling light guides
    • G02B6/245—Removing protective coverings of light guides before coupling
    • 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
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/56—Processes for repairing optical cables
    • G02B6/566—Devices for opening or removing the mantle

Definitions

  • the present invention relates to a tool for access to optical fibres contained inside a monotube type cable for optical fibres, according to the preamble of the main claim.
  • optical fibres as a transmission means is conventionally known in prior art.
  • Figure 1 shows a transversal section of a conventionally known cable for optical fibres 10 comprising a tube 2 that forms an internal channel wherein a plurality of optical fibres 11 is contained.
  • Each optical fibre 11 comprises a transmission nucleus 12 coated with at least one layer of polymer coating 13.
  • Reinforcing elements 14 are also included in the thickness of the tube wall 2 to provide the cable with the mechanical properties required for its intended use.
  • the tube 2 is generally made from a thermoplastic material, and the reinforcing elements 14 are made of fibre glass, for example.
  • grooves 15 are created on the external surface of the cable 10 in proximity to the reinforcing elements 14 in order to simplify the identification of their position.
  • the cables 10 containing the optical fibres 11 are laid along the walls of a building, often with long sections in a vertical direction.
  • openings 6 are created in said cables 10 to provide access to an optical fibre 11 positioned inside a cable 10, for example, in such a manner so that the said optical fibre 11 can be extracted from the cable in question and delivered to the end user 17.
  • USA patents 5,140,751 and 5,577,150 describe tools for access to optical fibres. Said tools completely enclose the sheath wherein the openings are to be made and therefore, especially when cables are fixed to a support, said tools are cumbersome to use.
  • the Applicant approached the problem of providing a tool for rapid access to optical fibres contained within a monotube, including those cases wherein the monotube is already fixed to a support.
  • the Applicant has provided a tool for access to optical fibres contained within a cable, characterised in that it comprises:
  • the tool according to the invention comprises a gripping means attached to the body.
  • Said gripping means can also include a handle.
  • Said handle can be set in a slanted position in relation to the longitudinal axis of the longitudinal recess.
  • said handle can be set perpendicular to the longitudinal axis of the longitudinal recess.
  • the body of the tool of the invention has a substantially U-shaped transversal section, to define the internal sidewalls between which the blade is fixed .
  • the blade of the tool forms an acute angle in relation to the longitudinal axis of the longitudinal recess.
  • said angle is comprised between 10° and 40°.
  • spacer elements are present within the recess to adapt the body to cables having different diameters.
  • the tool according to the invention has a body with rounded edges on at least one end.
  • the body of the tool is made from a plastic material.
  • Figure 1 shows a sectional view of a conventionally known cable for optical fibres, comprising a tubular element containing a plurality of optical fibres;
  • Figure 2 shows a system comprising optical fibres contained within a tubular cable of the type shown in figure
  • Figure 3 shows a perspective view of a first embodiment of a tool according to the invention, when in use;
  • Figures 4 to 6 show respective side, bottom and front views of the tool shown in 3;
  • Figures 7 to 10 show respective side, bottom, front and rear views of a second embodiment of the tool of the invention .
  • a tool 1 is applied onto the tube 2 of an optical fibre cable 10 for access to the optical fibres, which are contained therein.
  • the tool 1 comprises a body Ia having a longitudinal recess Ib for the partial housing of a section of the cable 10.
  • the blade 3 penetrates the cable 10.
  • the body Ia of the tool 1 comprises a handle 4, or some similar gripping means, to permit its manoeuvring.
  • the handle 4 is positioned on a slant in relation to the extension direction of the section of cable 10 wherein the opening 6 is to be performed.
  • the recess Ib of the body Ia has a U-shaped section, defining the internal sidewalls Ic and an end wall Id.
  • the blade 3 is fixed between the internal sidewalls Ic.
  • the blade 3 has a typically rectangular shape and can be of the replaceable type.
  • the blade 3 is fixed to the body Ia of the tool by fixing means, preferably removable, such as screws 7, rivets, or similar fixing means, for example.
  • the blade 3 forms an acute angle ⁇ in relation to the longitudinal axis x-x of the recess Ib.
  • the angle ⁇ is comprised between 10° and 40°, ends included.
  • the cutting edge 3a faces the open area towards the exterior of the recess Ib.
  • the distance between the sidewalls Ic is basically equal to the external diameter D of the largest sized foreseen cable 10 (for example: a cable containing 48 optical fibres) .
  • the cutting edge 3a of the blade 3 is positioned at a distance from the end wall Id of the recess, which is less than half of the external diameter D of the largest sized foreseen cable 10 that can be used with the tool according to the invention.
  • Spacer elements 8 can be foreseen within the longitudinal recess Ib to adapt the body Ia to the various diameters of cable 10.
  • these spacer elements 8 are specifically shaped elements with a basically U-shaped recess, which are inserted within the recess Ib, to reduce the depth P of the recess Ib, in question.
  • Said spacer elements 8 are dimensioned in relation to a corresponding cable size, which measures less than the maximum size, or in relation to a group of cable sizes, in such a manner that the distance from the end wall defined by the spacer element is less than half of the external diameter D of said cable of a lesser size.
  • Said spacer elements 8 can be fixed to the body by press-fitting or fixed joint, or by means of removable fixing elements, such as a screw 8a, for example.
  • the longitudinal recess Ia can have a transversal section with a semicircular or triangular shape, or some other form, suitable to contain the cable in a controlled position.
  • the body of the tool according to the invention can be made from a plastic material, produced by a moulding process, for example.
  • the creation of the opening in the tube 2 of the cable 10 occurs in the following manner.
  • the tool 1 is positioned over the cable 10, housing the cable in question within the longitudinal recess Ia, as shown in figure 3.
  • the tool By exercising controlled pressure on the cable, the tool is pulled along the cable 10 in question, in the cutting direction L, parallel to the axis of cable 10 (or at least, to the axis of the section of cable 10 that requires the cutting of an opening) .
  • the blade 3 progressively penetrates through the tube wall 2, as far as defined by the depth of the recess Ib (or by the spacer element 8 that corresponds with the size of the cable on which it is operating) and removes a portion of the tube wall 2 in question, thus creating an opening 6.
  • an opening 6 is formed having a substantially rectilinear longitudinal profile, parallel to the axis of the tube 2, connected to an oblique entry portion
  • the tool according to the invention can be advantageously used on cables 10 that present a pair of longitudinal reinforcing elements 14 set into the thickness of the tube wall 2 in diametrically opposite positions, without the blade 3 tampering with said reinforcing elements, since the distance between the cutting edge 3a of the blade in question, and the end wall Id of the recess Ib limits the blade penetration in the tube wall 2, in a controlled manner.
  • Figures from 7 to 10 show a second embodiment of the tool according to the invention.
  • the tool 1 comprises a handle 4 mechanically connected to the body Ia and substantially positioned perpendicular to the axis of the recess Ib, in turn parallel to the cutting direction L.
  • the body Ia is a specifically shaped element comprising a longitudinal recess Ib, with a U-shaped transversal section defining sidewalls Ic and an end wall Id.
  • the blade 3 is fixed to the body Ia through the recess Ib and is fixed to the body Ia by means of screws 7 or similar means, for example.
  • a connecting element 4b connects the handle 4 to the body Ia in a fixed manner.
  • connection 4b is an integrated part of the body Ia.
  • Said embodiment of the tool 1 according to the invention is particularly advantageous when the cable 10 is housed inside a box 20, as shown schematically in figure 2.
  • the tool 1 can be produced with very compact dimensions, suitable to permit access to the cable even when the cable portion in question requiring intervention is contained in a compartment of reduced size.
  • the rear end of the body (in relation to the cutting direction L) has rounded edges conceived to facilitate the release of the tool 1 from the cable 10 after the cutting operation of the opening 6 has been completed.
  • the tool according to the invention permits rapid access to the optical fibres contained in monotube cables, providing very regular shaped openings, even when said cables are fixed to a support or are contained inside a box element, even of a reduced size.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

A tool (1) for access to optical fibres contained within a cable (10), characterised in that it comprises: - a body (1a) having a longitudinal recess (1b) along a longitudinal axis, conceived to partially contain a section of cable (10); - a blade (3) having a cutting edge (3a), fixed transversally-inside said recess (1b) set at a predetermined slant in relation to the longitudinal axis of said recess (1b).

Description

TOOL FOR ACCESS TO OPTICAL FIBRES
The present invention relates to a tool for access to optical fibres contained inside a monotube type cable for optical fibres, according to the preamble of the main claim.
The use of optical fibres as a transmission means is conventionally known in prior art. To protect said optical fibres during installation and successive set-up, it is a known practice to house a plurality of fibres inside cables for monotube optical fibres.
Figure 1 shows a transversal section of a conventionally known cable for optical fibres 10 comprising a tube 2 that forms an internal channel wherein a plurality of optical fibres 11 is contained. Each optical fibre 11 comprises a transmission nucleus 12 coated with at least one layer of polymer coating 13. Reinforcing elements 14 are also included in the thickness of the tube wall 2 to provide the cable with the mechanical properties required for its intended use.
The tube 2 is generally made from a thermoplastic material, and the reinforcing elements 14 are made of fibre glass, for example.
For added convenience, grooves 15 are created on the external surface of the cable 10 in proximity to the reinforcing elements 14 in order to simplify the identification of their position.
In a typical application, the cables 10 containing the optical fibres 11 are laid along the walls of a building, often with long sections in a vertical direction.
As shown in figure 2, openings 6 are created in said cables 10 to provide access to an optical fibre 11 positioned inside a cable 10, for example, in such a manner so that the said optical fibre 11 can be extracted from the cable in question and delivered to the end user 17.
USA patents 5,140,751 and 5,577,150 describe tools for access to optical fibres. Said tools completely enclose the sheath wherein the openings are to be made and therefore, especially when cables are fixed to a support, said tools are cumbersome to use.
The Applicant approached the problem of providing a tool for rapid access to optical fibres contained within a monotube, including those cases wherein the monotube is already fixed to a support.
According to the present invention, the Applicant has provided a tool for access to optical fibres contained within a cable, characterised in that it comprises:
— a body Ia having a longitudinal recess Ib along a longitudinal axis, conceived to partially contain a section of cable 10; and
- a blade 3 having a cutting edge 3a, fixed transversally inside said recess Ib set at a predetermined slant in relation to the longitudinal axis of said recess Ib.
Preferably, the tool according to the invention comprises a gripping means attached to the body. Said gripping means can also include a handle. Said handle can be set in a slanted position in relation to the longitudinal axis of the longitudinal recess.
Alternatively, said handle can be set perpendicular to the longitudinal axis of the longitudinal recess.
In a preferred embodiment, the body of the tool of the invention has a substantially U-shaped transversal section, to define the internal sidewalls between which the blade is fixed .
Advantageously, the blade of the tool forms an acute angle in relation to the longitudinal axis of the longitudinal recess.
Preferably, said angle is comprised between 10° and 40°. In a preferred application, spacer elements are present within the recess to adapt the body to cables having different diameters. Preferably, the tool according to the invention has a body with rounded edges on at least one end.
Advantageously the body of the tool is made from a plastic material.
Further details are provided in the following description of an embodiment shown in the appended drawings wherein :
Figure 1 shows a sectional view of a conventionally known cable for optical fibres, comprising a tubular element containing a plurality of optical fibres; Figure 2 shows a system comprising optical fibres contained within a tubular cable of the type shown in figure
1;
Figure 3 shows a perspective view of a first embodiment of a tool according to the invention, when in use; Figures 4 to 6 show respective side, bottom and front views of the tool shown in 3;
Figures 7 to 10 show respective side, bottom, front and rear views of a second embodiment of the tool of the invention . With reference to figure 3, a tool 1 is applied onto the tube 2 of an optical fibre cable 10 for access to the optical fibres, which are contained therein.
The tool 1 comprises a body Ia having a longitudinal recess Ib for the partial housing of a section of the cable 10.
A blade 3, having a cutting edge 3a, visible in figure 5, is attached to the body Ia, crossing said recess Ib on a slant CC in relation to the longitudinal axis x-x of the recess Ib. When the tool is applied on the cable 10, in a manner so that it is positioned inside the recess Ib, the blade 3 penetrates the cable 10.
The body Ia of the tool 1 comprises a handle 4, or some similar gripping means, to permit its manoeuvring. In particular, in the embodiment of the invention shown in figure 3, the handle 4 is positioned on a slant in relation to the extension direction of the section of cable 10 wherein the opening 6 is to be performed.
The recess Ib of the body Ia has a U-shaped section, defining the internal sidewalls Ic and an end wall Id. The blade 3 is fixed between the internal sidewalls Ic.
The blade 3 has a typically rectangular shape and can be of the replaceable type.
The blade 3 is fixed to the body Ia of the tool by fixing means, preferably removable, such as screws 7, rivets, or similar fixing means, for example.
The blade 3 forms an acute angle α in relation to the longitudinal axis x-x of the recess Ib. Preferably, the angle α is comprised between 10° and 40°, ends included. The cutting edge 3a faces the open area towards the exterior of the recess Ib.
Advantageously, the distance between the sidewalls Ic is basically equal to the external diameter D of the largest sized foreseen cable 10 (for example: a cable containing 48 optical fibres) . The cutting edge 3a of the blade 3 is positioned at a distance from the end wall Id of the recess, which is less than half of the external diameter D of the largest sized foreseen cable 10 that can be used with the tool according to the invention. Spacer elements 8 can be foreseen within the longitudinal recess Ib to adapt the body Ia to the various diameters of cable 10.
For example, these spacer elements 8 are specifically shaped elements with a basically U-shaped recess, which are inserted within the recess Ib, to reduce the depth P of the recess Ib, in question.
Said spacer elements 8 are dimensioned in relation to a corresponding cable size, which measures less than the maximum size, or in relation to a group of cable sizes, in such a manner that the distance from the end wall defined by the spacer element is less than half of the external diameter D of said cable of a lesser size.
Said spacer elements 8 can be fixed to the body by press-fitting or fixed joint, or by means of removable fixing elements, such as a screw 8a, for example.
In an alternative embodiment, not illustrated herein, the longitudinal recess Ia can have a transversal section with a semicircular or triangular shape, or some other form, suitable to contain the cable in a controlled position. Advantageously, the body of the tool according to the invention can be made from a plastic material, produced by a moulding process, for example.
The creation of the opening in the tube 2 of the cable 10 occurs in the following manner. The tool 1 is positioned over the cable 10, housing the cable in question within the longitudinal recess Ia, as shown in figure 3.
By exercising controlled pressure on the cable, the tool is pulled along the cable 10 in question, in the cutting direction L, parallel to the axis of cable 10 (or at least, to the axis of the section of cable 10 that requires the cutting of an opening) .
In this manner, the blade 3 progressively penetrates through the tube wall 2, as far as defined by the depth of the recess Ib (or by the spacer element 8 that corresponds with the size of the cable on which it is operating) and removes a portion of the tube wall 2 in question, thus creating an opening 6.
In this manner, an opening 6 is formed having a substantially rectilinear longitudinal profile, parallel to the axis of the tube 2, connected to an oblique entry portion
6a and to a corresponding exit portion, not illustrated herein .
The tool according to the invention can be advantageously used on cables 10 that present a pair of longitudinal reinforcing elements 14 set into the thickness of the tube wall 2 in diametrically opposite positions, without the blade 3 tampering with said reinforcing elements, since the distance between the cutting edge 3a of the blade in question, and the end wall Id of the recess Ib limits the blade penetration in the tube wall 2, in a controlled manner.
Figures from 7 to 10 show a second embodiment of the tool according to the invention.
All elements of the tool having the same characteristics and functions, as the tool 1 of the first embodiment will be identified with the same reference numbers.
Advantageously, according to this embodiment, the tool 1 comprises a handle 4 mechanically connected to the body Ia and substantially positioned perpendicular to the axis of the recess Ib, in turn parallel to the cutting direction L.
The body Ia is a specifically shaped element comprising a longitudinal recess Ib, with a U-shaped transversal section defining sidewalls Ic and an end wall Id.
The blade 3 is fixed to the body Ia through the recess Ib and is fixed to the body Ia by means of screws 7 or similar means, for example.
A connecting element 4b connects the handle 4 to the body Ia in a fixed manner.
Advantageously, the connection 4b is an integrated part of the body Ia.
Said embodiment of the tool 1 according to the invention is particularly advantageous when the cable 10 is housed inside a box 20, as shown schematically in figure 2.
In fact, in this embodiment, the tool 1 can be produced with very compact dimensions, suitable to permit access to the cable even when the cable portion in question requiring intervention is contained in a compartment of reduced size.
Advantageously, as shown in figures 4 and 7, for example, the rear end of the body (in relation to the cutting direction L) has rounded edges conceived to facilitate the release of the tool 1 from the cable 10 after the cutting operation of the opening 6 has been completed.
In conclusion, the tool according to the invention permits rapid access to the optical fibres contained in monotube cables, providing very regular shaped openings, even when said cables are fixed to a support or are contained inside a box element, even of a reduced size.

Claims

I. Tool 1 for access to optical fibres contained in a cable 10, characterised in that it comprises:
— a body Ia having a longitudinal recess Ib along a longitudinal axis, conceived to partially contain a section of the cable 10;
- a blade 3 having a cutting edge 3a, fixed transversally in said recess Ib at a predetermined slant in relation to the longitudinal axis of said recess Ib.
2. Tool according to claim 1, characterised in that it comprises a gripping means 4 fixed to form part of body Ia.
3. Tool according to claim 1, characterised in that the body Ia has a substantially U-shaped transversal section defining internal side walls between which the blade is fixed.
4. Tool according to claim 1, characterised in that the blade 3 forms an acute angle α in relation to the longitudinal axis of the longitudinal recess Ib.
5. Tool according to claim 2, characterised in that the angle α is comprised between 10° and 40°.
6. Tool according to claim 1, characterised in that spacer elements are present within the recess Ib to adapt the body Ia to cables of various diameters.
7. Tool according to claim 2, characterised in that the gripping means 4 comprises a handle.
8. Tool 1 according to claim 7, characterised in that the handle is set on a slant in relation to the longitudinal axis of the longitudinal recess Ib.
9. Tool according to claim 7, characterised in that the handle is perpendicular in relation to the longitudinal axis of the longitudinal recess Ib.
10. Tool according to claim 1, characterised in that the body Ia has one end with rounded edges 9.
II. Tool according to claim 1, characterised in that the body Ia is made from a plastic material.
PCT/EP2008/067146 2008-01-04 2008-12-09 Tool for access to optical fibres WO2009087007A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES08869848.5T ES2457274T3 (en) 2008-01-04 2008-12-09 Optical fiber access tool
EP08869848.5A EP2227710B1 (en) 2008-01-04 2008-12-09 Tool for access to optical fibres
US12/811,370 US20110010944A1 (en) 2008-01-04 2008-12-09 Tool for access to optical fibres

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000008A ITMI20080008A1 (en) 2008-01-04 2008-01-04 TOOL TO ACCESS OPTICAL FIBERS
ITMI2008A000008 2008-01-04

Publications (1)

Publication Number Publication Date
WO2009087007A1 true WO2009087007A1 (en) 2009-07-16

Family

ID=40290040

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/067146 WO2009087007A1 (en) 2008-01-04 2008-12-09 Tool for access to optical fibres

Country Status (5)

Country Link
US (1) US20110010944A1 (en)
EP (1) EP2227710B1 (en)
ES (1) ES2457274T3 (en)
IT (1) ITMI20080008A1 (en)
WO (1) WO2009087007A1 (en)

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WO2011147440A1 (en) * 2010-05-25 2011-12-01 Prysmian S.P.A. Stripping tool for optical cable

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US8924569B2 (en) 2009-12-17 2014-12-30 Intel Corporation Cloud federation as a service
EP2600474B1 (en) * 2011-11-30 2015-10-14 CCS Technology, Inc. Cutting apparatus to cut a coating of a grooved tight buffered fiber
JP2016522433A (en) * 2013-04-15 2016-07-28 オーエフエス ファイテル，エルエルシー Laying optical fiber bundles in apartment buildings to provide network access to multiple user units
US20150378126A1 (en) * 2013-06-12 2015-12-31 Ripley Tools, Llc Mid-span buffer shaving tool
DE102014004614A1 (en) 2014-03-29 2015-10-01 Kolbus Gmbh & Co. Kg Device for forming book covers
JP2017028817A (en) * 2015-07-21 2017-02-02 日本電信電話株式会社 Cable jacket remover
WO2020086450A1 (en) * 2018-10-22 2020-04-30 Commscope Technologies Llc Sealing enclosure arrangements for optical fiber cables
US11349285B2 (en) * 2020-01-30 2022-05-31 ButlerBilt L.L.C. Cut resistant knife
US11789229B2 (en) * 2021-11-29 2023-10-17 Centurylink Intellectual Property Llc Handheld tool for removing a wire from within an optical cable

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Also Published As

Publication number Publication date
ES2457274T3 (en) 2014-04-25
EP2227710B1 (en) 2014-02-12
EP2227710A1 (en) 2010-09-15
ITMI20080008A1 (en) 2009-07-05
US20110010944A1 (en) 2011-01-20

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