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US20070029792A1 - Support tube for a cold-shrink sleeve for joining electric cables - Google Patents

Support tube for a cold-shrink sleeve for joining electric cables Download PDF

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Publication number
US20070029792A1
US20070029792A1 US11/481,431 US48143106A US2007029792A1 US 20070029792 A1 US20070029792 A1 US 20070029792A1 US 48143106 A US48143106 A US 48143106A US 2007029792 A1 US2007029792 A1 US 2007029792A1
Authority
US
United States
Prior art keywords
support tube
tongues
sleeve
tube
shrink
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.)
Abandoned
Application number
US11/481,431
Inventor
Patrick Andre
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.)
Nexans SA
Original Assignee
Nexans SA
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 Nexans SA filed Critical Nexans SA
Publication of US20070029792A1 publication Critical patent/US20070029792A1/en
Assigned to NEXANS reassignment NEXANS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANDRE, PATRICK
Priority to US12/070,724 priority Critical patent/US20080209724A1/en
Abandoned legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/182—Cable junctions protected by sleeves, e.g. for communication cable held in expanded condition in radial direction prior to installation
    • H02G15/1826—Cable junctions protected by sleeves, e.g. for communication cable held in expanded condition in radial direction prior to installation on a removable hollow core, e.g. a tube
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/40—Information retrieval; Database structures therefor; File system structures therefor of multimedia data, e.g. slideshows comprising image and additional audio data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/49217—Contact or terminal manufacturing by assembling plural parts by elastic joining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/4987—Elastic joining of parts

Definitions

  • the invention relates to a support tube for a cold-shrink sleeve for joining electric cables.
  • two circular-section cylindrical support tubes made of plastics material, e.g. polypropylene, and covered in a cold-shrink elastomer sleeve, are placed end to end over the connection, and then the support tubes are withdrawn by being pulled away and by being broken on either side of the joint, with the sleeve shrinking to cover intimately the connection together with the ends of the cables.
  • plastics material e.g. polypropylene
  • the two half-tubes are injection molded, and because of mold shrinkage the half-tubes are not perfectly cylindrical. They are deformed, and as a result their mutual engagement in the vicinity of the welds is not perfect.
  • the tube tends to deform under the pressure exerted by the sleeve.
  • the half-tubes are not connected together, and as a result there is relative displacement between the half-tubes, which is accompanied by effects of warping, gaping, and ovalizing of the resulting support tube.
  • the welding leads to beads on the inside of the tube that come into contact with, and catch on, the parts located inside the tube when it is installed on the cables and the connection between.
  • Ultrasound welding is an operation that is expensive in terms of labor and maintenance, and it is also very noisy.
  • Such a support tube is held in its closed position solely by the radial pressure exerted by the shrink sleeve, once it has been placed on the tube.
  • the method of fabricating and mounting the shrink sleeve on the support tube is complex since it is necessary to use external tooling of the circular band type in order to hold the support tube closed while the sleeve is being put into place thereon.
  • the invention solves this problem, and to do this the invention provides a shrink-sleeve support tube for supporting, in an expanded state, a sleeve for an electric cable joint, and then for being removed so as to allow the sleeve to shrink onto the joint, the support tube being constituted by an open tube, and the open tube is fitted on its two longitudinal edges with mutual engagement means.
  • the engagement means serve firstly to make it easy to close the support tube, and secondly they enable the support tube to be broken in regular manner at the end of assembling the joint.
  • said engagement means are distributed regularly along said longitudinal edges.
  • said engagement means are constituted by snap-fastening teeth.
  • said longitudinal edges are constituted by mutual engagement tongues of thickness substantially equal to half the total thickness of the tube.
  • said mutual engagement tongues on an edge alternate between being internal tongues and external tongues.
  • said snap-fastening teeth are disposed on the contacting faces of some of said tongues.
  • FIGS. 1A to 1 E are face, section, and perspective views of a support tube in accordance with the invention in the open position.
  • FIGS. 2A to 2 E are face, section, and perspective views of a support tube in accordance with the invention in the assembled position.
  • the figures thus show a support tube 1 for supporting a shrink sleeve for an electric cable joint, the tube serving to support a sleeve while it is in an expanded state and then to be removed so as to allow the sleeve to shrink onto the joint.
  • the tube is constituted by an open tube fitted along its two longitudinal edges with mutual engagement means.
  • FIGS. 1A to 1 D show the support tube when open, in the form it presents on leaving an injection mold. It is made of a plastics material, e.g. polypropylene.
  • the engagement means are regularly distributed along the longitudinal edges that are designed to be in alignment and connected together. These two longitudinal edges are constituted by engagement tongues of thickness equal substantially to half the total thickness of the tube, the engagement tongues along any one edge alternating between tongues that are internal and tongues that are external.
  • edge 2 it has a series of tongues, with every other tongue being internal such as the tongues referenced 2 B and 2 D, while the remaining tongues are external, such as the tongues referenced 2 A, 2 C, and 2 E.
  • the other edge 3 is made in the same manner but with the tongues being in the opposite positions, so as to enable the tongues on the two edges 2 and 3 to engage mutually when these two edges are brought into alignment and pressed against each other.
  • the tongues are all identical in length. However, advantageously, by making the engagement tongues of different lengths, it is possible to adjust the holding force of the tube, and this is beneficial when tearing the tube away from the conductor.
  • a certain number of tongues are provided with engagement means constituted by snap-fastening teeth 20 , 30 disposed on the contacting faces of some of the tongues 2 C, 3 C. These engagement means are disposed along the total length of the tube 1 .
  • the support tube 1 is closed as shown in FIGS. 2A to 2 E.
  • the facing tongues on the two edges 2 and 3 engage mutually one on another and the tongues 2 C, 3 C carrying the snap-fastening teeth catch one on the other.
  • the support tube 1 is then ready to be used as a support for a shrink sleeve for an electric cable joint, the sleeve being placed in an expanded state on the support tube 1 which is then placed over a joint from which it is removed by being pulled away and broken, so as to enable the sleeve to shrink onto the joint.
  • the tube in accordance with the invention can be clipped together directly on leaving its mold by a robot or some other automatic means, thereby protecting the snap-fastening teeth and the mutual engagement tongues during transport, and thus avoiding an additional station for closing the tube.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Data Mining & Analysis (AREA)
  • Databases & Information Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Cable Accessories (AREA)
  • Processing Of Terminals (AREA)

Abstract

The invention relates to a support tube for a shrink sleeve for an electric cable joint, the tube serving to support a sleeve in an expanded state and then to be removed so as to allow the sleeve to shrink onto the joint. According to the invention, the support tube is constituted by an open tube fitted on its two longitudinal edges with mutual engagement means.

Description

    RELATED APPLICATION
  • This application is related to and claims the benefit of priority from French Patent Application No. 05 52068, filed on Jul. 6, 2005, the entirety of which is incorporated herein by reference.
    • FIELD OF THE INVENTION
  • The invention relates to a support tube for a cold-shrink sleeve for joining electric cables.
    • BACKGROUND OF THE INVENTION
  • When making such a joint, once the conductor has been connected, two circular-section cylindrical support tubes made of plastics material, e.g. polypropylene, and covered in a cold-shrink elastomer sleeve, are placed end to end over the connection, and then the support tubes are withdrawn by being pulled away and by being broken on either side of the joint, with the sleeve shrinking to cover intimately the connection together with the ends of the cables.
  • It is known to make such a support tubes by means of two half-tubes that are welded together by ultrasound welding over two zones in the proximity of the ends of the half-tubes. The resulting support tube presents four longitudinal weld zones extending along two diametrically opposite generator lines.
  • That configuration presents the following technical problems.
  • The two half-tubes are injection molded, and because of mold shrinkage the half-tubes are not perfectly cylindrical. They are deformed, and as a result their mutual engagement in the vicinity of the welds is not perfect.
  • The tube tends to deform under the pressure exerted by the sleeve. In the central zone of the tube, the half-tubes are not connected together, and as a result there is relative displacement between the half-tubes, which is accompanied by effects of warping, gaping, and ovalizing of the resulting support tube.
  • In the end zones, the welding leads to beads on the inside of the tube that come into contact with, and catch on, the parts located inside the tube when it is installed on the cables and the connection between.
  • When mounted on the joint, the support tube is removed by being pulled and broken. The breaking takes place along the weld zones. These weld zones are therefore difficult to make. A compromise must be found between the strength needed for holding the two half-tubes properly and sufficient weakness for breaking to be relatively easy when the tube is removed.
  • Ultrasound welding is an operation that is expensive in terms of labor and maintenance, and it is also very noisy.
  • It is also known from patent document FR 2 810 465 to make a shrink-sleeve support tube for joining electric cables that is to support a sleeve in an expanded state and that is then to be removed so as to allow the sleeve to shrink onto the joint, which support tube is constituted by an open tube.
  • Such a support tube is held in its closed position solely by the radial pressure exerted by the shrink sleeve, once it has been placed on the tube.
  • The method of fabricating and mounting the shrink sleeve on the support tube is complex since it is necessary to use external tooling of the circular band type in order to hold the support tube closed while the sleeve is being put into place thereon.
    • OBJECT AND SUMMARY OF THE INVENTION
  • The invention solves this problem, and to do this the invention provides a shrink-sleeve support tube for supporting, in an expanded state, a sleeve for an electric cable joint, and then for being removed so as to allow the sleeve to shrink onto the joint, the support tube being constituted by an open tube, and the open tube is fitted on its two longitudinal edges with mutual engagement means.
  • The engagement means serve firstly to make it easy to close the support tube, and secondly they enable the support tube to be broken in regular manner at the end of assembling the joint.
  • In a preferred embodiment of the invention, said engagement means are distributed regularly along said longitudinal edges.
  • Preferably, said engagement means are constituted by snap-fastening teeth.
  • Advantageously, said longitudinal edges are constituted by mutual engagement tongues of thickness substantially equal to half the total thickness of the tube.
  • Preferably, said mutual engagement tongues on an edge alternate between being internal tongues and external tongues.
  • Advantageously, said snap-fastening teeth are disposed on the contacting faces of some of said tongues.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention is described below in detail with the help of figures that show merely a preferred embodiment of the invention.
  • FIGS. 1A to 1E are face, section, and perspective views of a support tube in accordance with the invention in the open position.
  • FIGS. 2A to 2E are face, section, and perspective views of a support tube in accordance with the invention in the assembled position.
    • MORE DETAILED DESCRIPTION
  • The figures thus show a support tube 1 for supporting a shrink sleeve for an electric cable joint, the tube serving to support a sleeve while it is in an expanded state and then to be removed so as to allow the sleeve to shrink onto the joint. The tube is constituted by an open tube fitted along its two longitudinal edges with mutual engagement means.
  • FIGS. 1A to 1D show the support tube when open, in the form it presents on leaving an injection mold. It is made of a plastics material, e.g. polypropylene.
  • The engagement means are regularly distributed along the longitudinal edges that are designed to be in alignment and connected together. These two longitudinal edges are constituted by engagement tongues of thickness equal substantially to half the total thickness of the tube, the engagement tongues along any one edge alternating between tongues that are internal and tongues that are external.
  • More precisely, with reference to an edge 2, it has a series of tongues, with every other tongue being internal such as the tongues referenced 2B and 2D, while the remaining tongues are external, such as the tongues referenced 2A, 2C, and 2E.
  • The other edge 3 is made in the same manner but with the tongues being in the opposite positions, so as to enable the tongues on the two edges 2 and 3 to engage mutually when these two edges are brought into alignment and pressed against each other.
  • In the embodiment shown, the tongues are all identical in length. However, advantageously, by making the engagement tongues of different lengths, it is possible to adjust the holding force of the tube, and this is beneficial when tearing the tube away from the conductor.
  • A certain number of tongues are provided with engagement means constituted by snap-fastening teeth 20, 30 disposed on the contacting faces of some of the tongues 2C, 3C. These engagement means are disposed along the total length of the tube 1.
  • On leaving the mold, the support tube 1 is closed as shown in FIGS. 2A to 2E.
  • The facing tongues on the two edges 2 and 3 engage mutually one on another and the tongues 2C, 3C carrying the snap-fastening teeth catch one on the other.
  • The support tube 1 is then ready to be used as a support for a shrink sleeve for an electric cable joint, the sleeve being placed in an expanded state on the support tube 1 which is then placed over a joint from which it is removed by being pulled away and broken, so as to enable the sleeve to shrink onto the joint.
  • The tube in accordance with the invention can be clipped together directly on leaving its mold by a robot or some other automatic means, thereby protecting the snap-fastening teeth and the mutual engagement tongues during transport, and thus avoiding an additional station for closing the tube.

Claims (6)

1. A shrink-sleeve support tube comprising:
an open tube fitted on its two longitudinal edges with mutual engagement means, said open tube for supporting, in an expanded state, a sleeve for an electric cable joint, and then for being removed so as to allow the sleeve to shrink onto the joint.
2. A support tube according to claim 1, wherein said engagement means are distributed regularly along said longitudinal edges.
3. A support tube according to claim 1, wherein said engagement means are constituted by snap-fastening teeth.
4. A support tube according to claim 1, wherein said longitudinal edges are constituted by mutual engagement tongues of thickness substantially equal to half the total thickness of the tube.
5. A support tube according to claim 4, wherein said mutual engagement tongues on an edge alternate between being internal tongues and external tongues.
6. A support tube according to claim 4, wherein said engagement means are constituted by snap-fastening teeth that are disposed on the contacting faces of some of said tongues.
US11/481,431 2005-07-06 2006-07-05 Support tube for a cold-shrink sleeve for joining electric cables Abandoned US20070029792A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/070,724 US20080209724A1 (en) 2005-07-06 2008-02-20 Support tube for a cold-shrink sleeve for joining electric cables

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0552068A FR2888414B1 (en) 2005-07-06 2005-07-06 COLD RETRACTABLE SLEEVE SUPPORT TUBE FOR JOINING ELECTRIC CABLES
FR0552461 2005-08-08

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/070,724 Division US20080209724A1 (en) 2005-07-06 2008-02-20 Support tube for a cold-shrink sleeve for joining electric cables

Publications (1)

Publication Number Publication Date
US20070029792A1 true US20070029792A1 (en) 2007-02-08

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US11/481,431 Abandoned US20070029792A1 (en) 2005-07-06 2006-07-05 Support tube for a cold-shrink sleeve for joining electric cables
US12/070,724 Abandoned US20080209724A1 (en) 2005-07-06 2008-02-20 Support tube for a cold-shrink sleeve for joining electric cables

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EP (1) EP1742318A1 (en)
FR (1) FR2888414B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2328248A2 (en) 2009-11-27 2011-06-01 Melbye Skandinavia AS Support tube for cold-shrink sleeve for electrical cable joint
US20220029364A1 (en) * 2020-07-24 2022-01-27 Te Connectivity Germany Gmbh Electrical Ferrule, Electrical Connecting Device and Electrical Connector
US11705711B2 (en) 2019-04-09 2023-07-18 3M Innovative Properties Company Support core for an elastic sleeve

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012161589A1 (en) * 2011-05-26 2012-11-29 Melbye Skandinavia As Method for establishing a cold shrink joint and a shrink sleeve support tube system
CN106877271B (en) * 2017-04-17 2019-07-05 苏州鼎鑫冷热缩材料有限公司 Inner lining body for shrinkage part
CN106911109B (en) * 2017-04-17 2019-07-05 苏州鼎鑫冷热缩材料有限公司 The supporting element of triangle silicon rubber cold shrink tube
CN110017859A (en) * 2018-01-08 2019-07-16 北京航空航天大学 Control of Wheeled Mobile Robots system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515798A (en) * 1968-12-06 1970-06-02 Minnesota Mining & Mfg Elastic cover and removable cone assembly
US3744822A (en) * 1971-01-15 1973-07-10 Hydro Tech Services Inc Apparatus for a sealing external surface of a tubular member
US3924661A (en) * 1973-07-16 1975-12-09 Frank G Bornhoffer Flexible hose storage container
US4448824A (en) * 1982-01-28 1984-05-15 Raychem Corporation Wraparound protective closure
US4963700A (en) * 1989-04-26 1990-10-16 Minnesota Mining And Manufacturing Company Closure arrangements for electrical splices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741252A (en) * 1971-09-14 1973-06-26 Hydril Co Pipe protector
GB0014643D0 (en) * 2000-06-16 2000-08-09 Smiths Industries Plc Methods and assemblies
JP2004034518A (en) * 2002-07-03 2004-02-05 Three M Innovative Properties Co Slide detaching type core member and ordinary temperature shrunk tube apparatus having the core member

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515798A (en) * 1968-12-06 1970-06-02 Minnesota Mining & Mfg Elastic cover and removable cone assembly
US3744822A (en) * 1971-01-15 1973-07-10 Hydro Tech Services Inc Apparatus for a sealing external surface of a tubular member
US3924661A (en) * 1973-07-16 1975-12-09 Frank G Bornhoffer Flexible hose storage container
US4448824A (en) * 1982-01-28 1984-05-15 Raychem Corporation Wraparound protective closure
US4963700A (en) * 1989-04-26 1990-10-16 Minnesota Mining And Manufacturing Company Closure arrangements for electrical splices

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2328248A2 (en) 2009-11-27 2011-06-01 Melbye Skandinavia AS Support tube for cold-shrink sleeve for electrical cable joint
US11705711B2 (en) 2019-04-09 2023-07-18 3M Innovative Properties Company Support core for an elastic sleeve
US20220029364A1 (en) * 2020-07-24 2022-01-27 Te Connectivity Germany Gmbh Electrical Ferrule, Electrical Connecting Device and Electrical Connector
US11870189B2 (en) * 2020-07-24 2024-01-09 Te Connectivity Germany Gmbh Electrical ferrule, electrical connecting device and electrical connector

Also Published As

Publication number Publication date
FR2888414A1 (en) 2007-01-12
US20080209724A1 (en) 2008-09-04
EP1742318A1 (en) 2007-01-10
FR2888414B1 (en) 2007-09-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NEXANS, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ANDRE, PATRICK;REEL/FRAME:019454/0105

Effective date: 20060825

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION