WO1999056369A1 - Strain relieved leading-in connection for signal cables with twisted wire pairs - Google Patents

Strain relieved leading-in connection for signal cables with twisted wire pairs Download PDF

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Publication number
WO1999056369A1
WO1999056369A1 PCT/DK1999/000230 DK9900230W WO9956369A1 WO 1999056369 A1 WO1999056369 A1 WO 1999056369A1 DK 9900230 W DK9900230 W DK 9900230W WO 9956369 A1 WO9956369 A1 WO 9956369A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
wire pairs
strain
element according
relieving
Prior art date
Application number
PCT/DK1999/000230
Other languages
Danish (da)
French (fr)
Inventor
Morten Petri Jensen
Ulrik Nielsen
Original Assignee
Cekan/Cdt A/S
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 Cekan/Cdt A/S filed Critical Cekan/Cdt A/S
Priority to AU31393/99A priority Critical patent/AU743955C/en
Priority to EP99913135A priority patent/EP1078429B1/en
Priority to DE69922949T priority patent/DE69922949T2/en
Priority to CA002329984A priority patent/CA2329984C/en
Priority to NZ508002A priority patent/NZ508002A/en
Priority to US09/673,252 priority patent/US6599148B1/en
Publication of WO1999056369A1 publication Critical patent/WO1999056369A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
    • H01R13/5804—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable comprising a separate cable clamping part
    • H01R13/5808—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable comprising a separate cable clamping part formed by a metallic element crimped around the cable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
    • H01R13/6461—Means for preventing cross-talk
    • H01R13/6463—Means for preventing cross-talk using twisted pairs of wires
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S439/00—Electrical connectors
    • Y10S439/941—Crosstalk suppression

Definitions

  • the present invention concerns a strain-relieved leading- in connection for signal cables with a cable jacket and with several twisted wire pairs, respectively an apparatus or a connection element of the plug or socket type with such a leading-in connection, where clamping means are provided for co-operation with the cable for the strain-relieving of a closely disposed termination area for the wires in the cable. Regardless of whether the ends of the wires are terminated by- soldering or clamping, it will be unfortunate if forces arising on the cable shall be absorbed solely by these assemblies. The same applies for current supply cables, also in- eluding those for power lines where, e.g. in connection with input plugs, it is quite traditional to use strain-relieving by firm clamping of the cable in the relevant lead-in connection.
  • Fig. 1 is a schematic view of a cross-section of a signal cable with an outer cable jacket 2 and a number of internal wire pairs, designated 4a-d.
  • each pair of cables is twisted with a quite definite pitch which is different from the others, and the pairs are twisted around one another throughout the whole length of the cable. In principle, this provides a perfect electrical balance between the wires in the individual pairs and between the pairs.
  • Fig. 2 shows that when the same cable is terminated in a plug, by today's standard the round cable will be pressed into a common lead-in passage where, typically by using common clamping means 6, the jacket 2 with the wire pairs 4 are squeezed in a random and often quite unfortunate manner, in that the twist conditions are changed to a dramatic extent. Note, e.g., pairs 4a and 4c, where the possibility is created for a very inductive coupling, the reason being that the pair twisting has been ruined.
  • fig. 3 is shown another known way of providing strain- relief for signal cables. Use is made here of a lead-through opening with an annular clamping arrangement 6 which can secure the cable by clamping around the cable jacket. This will result in less disturbance of the twist conditions, but on the other hand will give rise to an unfortunate tight squeezing together of the twisted wire pairs.
  • the cable jacket can be secured in a reasonably effective manner by a moderate twisting together, but as indicated in fig.
  • the object of the invention is to provide a lead-in con- nection which does not display the above-mentioned disadvantages, and according to the invention this can be achieved by dividing the lead-in area into mutually separated lead-in passages for the individual wire pairs, in that each of these passages is provided with clamping means for the clamping of the wire pairs which are led through them. It will be seen that a fixing of the cable jacket is hereby more or less done away with, but on the other hand it is achieved that the wire pairs will be completely separated and be individually and effectively secured, so that the termination areas are spared for undesirable influences on the cable.
  • the individual wire pairs can naturally not absorb the same high forces as those which can be absorbed by a strong clamping of the whole of the cable, but by virtue of the surface pressure against the insulation layer of the wires in the respective wire pairs, a particularly good holding effect can, however, still be created, and which in by far the majority of cases will be fully adequate.
  • the electrical couplings arising between the pairs will hereby be automatically weakened, and it will thus be of less importance that the regular twisting of the individual wire pairs can be disturbed quite locally in the individual lead-in passages.
  • figs. 1-3 are illustrations respectively of a signal cable and two known methods of strain-relieved lead-in connections as already described
  • figs. 4 and 5 are related longitudinal and cross- sectional views for the illustration of a lead-in connection according to the invention
  • fig. 7 is a corresponding view of strain-relieving elements as in integral part of a connection element.
  • a lead-in connection according to the invention will have a number of narrow pas- sages 8 for the individual wire pairs, said passages being generally disposed with a distance between them which is considerably greater than the distances between the wire pairs in the cable 2, which is indicated by a stippled circle C.
  • the respective wire pairs are secured in the individual pas- sages by means of clamping parts 10 in the form of terminal screws, spring clips or clamps which can be activated individually or collectively.
  • clamping parts 10 in the form of terminal screws, spring clips or clamps which can be activated individually or collectively.
  • use can possibly be made of special filling-out elements 12 in the formation of the inner wall parts of the passages 8, said elements having a conical projecting part 14 which supports the wire pairs where these branch out from the signal cable.
  • the lead-in element can be in the form of a separate element which can be connected mechanically to a connection plug 16, e.g. by means of retaining hooks 18. Moreover, it is shown that the same element can be connected to a casing 20 which extends rearwards in over the outer end of the cut-back cable jacket 2, and hereby stabilises this end against sharp bending-out immediately outside the lead-in element.
  • the lead-in element is configured as an integrated part of a connection element with contact springs 22 for connection with a corresponding plug element.
  • the invention will not only comprise the relevant lead-in elements with or without plug or apparatus parts, but also these units in the wire-mounted condition, where the signal wire pairs are arranged as disclosed here.
  • the elements will also be able to be used even though the wires are not all grouped in well-defined "pairs".

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  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

In the termination of signal cables with two or more wire pairs, it is customary to effect a clamping of the cable in order to relieve the strain on the wires themselves and the terminal connections. This, however, results in an uncontrollable re-arrangement of the wire pairs with associated interference between them. With the invention, this is avoided in that the termination or the strain-relieving element is configured with mutually separated lead-in passages for the individual wire pairs, and with associated clamping means for each of the wire pairs led through the passage. There is hereby achieved a well-controlled electrical separation between the wire pairs, and also an improved mechanical strain relief, i.e. by a primary clamping of the wire pairs themselves. By using a wedge part for insertion into the end of the cable, it can be ensured that the wire pairs extend from the end of the cable in an evenly inclining manner, whereby signal reflections from the area will be minimised.

Description

Strain relieved leading-in connection for signal cables with twisted wire pairs.
The present invention concerns a strain-relieved leading- in connection for signal cables with a cable jacket and with several twisted wire pairs, respectively an apparatus or a connection element of the plug or socket type with such a leading-in connection, where clamping means are provided for co-operation with the cable for the strain-relieving of a closely disposed termination area for the wires in the cable. Regardless of whether the ends of the wires are terminated by- soldering or clamping, it will be unfortunate if forces arising on the cable shall be absorbed solely by these assemblies. The same applies for current supply cables, also in- eluding those for power lines where, e.g. in connection with input plugs, it is quite traditional to use strain-relieving by firm clamping of the cable in the relevant lead-in connection.
It must be ascertained that precisely this form of re- lieving technique has by and large been practised in the signal cable area, i.e. by a simple clamping of the cable between opposing clamping strips, which with good tightening provides an excellent strain relief, in that the clampe - together cable jacket, which normally consists of flexible plastic, will pack well around the leads and hereby secure these with great friction. However, it is precisely with signal cables that this gives rise to distinct problems, which will now be explained in more detail with reference to figs. 1 and 2 of the drawing: Fig. 1 is a schematic view of a cross-section of a signal cable with an outer cable jacket 2 and a number of internal wire pairs, designated 4a-d.
Typically, each pair of cables is twisted with a quite definite pitch which is different from the others, and the pairs are twisted around one another throughout the whole length of the cable. In principle, this provides a perfect electrical balance between the wires in the individual pairs and between the pairs. Fig. 2 shows that when the same cable is terminated in a plug, by today's standard the round cable will be pressed into a common lead-in passage where, typically by using common clamping means 6, the jacket 2 with the wire pairs 4 are squeezed in a random and often quite unfortunate manner, in that the twist conditions are changed to a dramatic extent. Note, e.g., pairs 4a and 4c, where the possibility is created for a very inductive coupling, the reason being that the pair twisting has been ruined. The signal carried by the cable is hereby brought into great unbalance, in that undesirable signal coupling is generated between these pairs. Moreover, the impedance seen in the strain-relief will be changed considerably because of the ruined pair twisting. This results in undesirable signal reflection from the cable relieving point. In fig. 3 is shown another known way of providing strain- relief for signal cables. Use is made here of a lead-through opening with an annular clamping arrangement 6 which can secure the cable by clamping around the cable jacket. This will result in less disturbance of the twist conditions, but on the other hand will give rise to an unfortunate tight squeezing together of the twisted wire pairs. The cable jacket can be secured in a reasonably effective manner by a moderate twisting together, but as indicated in fig. 3, traction and/ or torsion in the cable with thus give rise to longitudinal movements of the wire pairs, so that the termination points are loaded by these movements. Consequently, the terminations become unstable, regardless of whether use is made of soldering, crimping, blade contacts or the like.
The object of the invention is to provide a lead-in con- nection which does not display the above-mentioned disadvantages, and according to the invention this can be achieved by dividing the lead-in area into mutually separated lead-in passages for the individual wire pairs, in that each of these passages is provided with clamping means for the clamping of the wire pairs which are led through them. It will be seen that a fixing of the cable jacket is hereby more or less done away with, but on the other hand it is achieved that the wire pairs will be completely separated and be individually and effectively secured, so that the termination areas are spared for undesirable influences on the cable. The individual wire pairs can naturally not absorb the same high forces as those which can be absorbed by a strong clamping of the whole of the cable, but by virtue of the surface pressure against the insulation layer of the wires in the respective wire pairs, a particularly good holding effect can, however, still be created, and which in by far the majority of cases will be fully adequate. In practice it will be necessary - and even directly desirable - for the wire pairs to be led to lead-in positions in which they are mutually separated by an even greater distance than inside the cable. The electrical couplings arising between the pairs will hereby be automatically weakened, and it will thus be of less importance that the regular twisting of the individual wire pairs can be disturbed quite locally in the individual lead-in passages.
The invention will now be explained in more detail with reference to the drawing, in which figs. 1-3 are illustrations respectively of a signal cable and two known methods of strain-relieved lead-in connections as already described, figs. 4 and 5 are related longitudinal and cross- sectional views for the illustration of a lead-in connection according to the invention, and fig. 7 is a corresponding view of strain-relieving elements as in integral part of a connection element.
With reference to figs. 4 and 5, a lead-in connection according to the invention will have a number of narrow pas- sages 8 for the individual wire pairs, said passages being generally disposed with a distance between them which is considerably greater than the distances between the wire pairs in the cable 2, which is indicated by a stippled circle C. The respective wire pairs are secured in the individual pas- sages by means of clamping parts 10 in the form of terminal screws, spring clips or clamps which can be activated individually or collectively. As shown in fig. 4, use can possibly be made of special filling-out elements 12 in the formation of the inner wall parts of the passages 8, said elements having a conical projecting part 14 which supports the wire pairs where these branch out from the signal cable.
Moreover, a gradual change in impedance will hereby be achieved at the transition between the cable and the lead-in element, which will minimise signal reflections from the area. The cable jacket 2 itself is correspondingly cut back and thus does not in any way form an immediate part of the strain-relieving element. However, this will still be particularly effective in that all of the wire pairs are secured separately, and thus it will further apply that this securing will be effected with the wire pairs so widely separated that, from the electrical point of view, the positions in which the individual wires in the wire pairs are mutually disposed in the clamped-in condition will not be of any significance. In fig. 6 it is shown that the lead-in element can be in the form of a separate element which can be connected mechanically to a connection plug 16, e.g. by means of retaining hooks 18. Moreover, it is shown that the same element can be connected to a casing 20 which extends rearwards in over the outer end of the cut-back cable jacket 2, and hereby stabilises this end against sharp bending-out immediately outside the lead-in element.
In the example shown in fig. 7, the lead-in element is configured as an integrated part of a connection element with contact springs 22 for connection with a corresponding plug element.
The invention will not only comprise the relevant lead-in elements with or without plug or apparatus parts, but also these units in the wire-mounted condition, where the signal wire pairs are arranged as disclosed here. The elements will also be able to be used even though the wires are not all grouped in well-defined "pairs".

Claims

C A I M S
1. Termination or strain-relieving element for signal cables with several wire pairs, with clamping means for the strain-relieving of a connected cable, c h a r a c t er i z e d in that the element is configured with mutually separated lead-in passages for the individual wire pairs, and in that each of these passages is provided with clamping means for the securing of the wire pair led through the pas- sage.
2. Element according to claim 1, characterized in that it consists of a termination element which can be in coupled- together connection with a strain-relieving element according to claim 1. 3. Element according to claim 1, characterized in that it is provided with a connection piece which by outwards projection or in another manner can surround the outer cable jacket with a more or less strong frictional engagement herewith, but without any appreciable clamping together of the cable.
4. Element according to claim 1, characterized in that the element is configured with a projecting wedge part for insertion into a cable end for the support of the wire pairs in an even and outwardly-inclining manner from the cable end.
AMENDED CLAIMS
[received by the International Bureau on 28 September 1999 (28.09.99); original claim 1 amended; remaining claims unchanged (1 page)]
1. Termination or strain-relieving element for signal cables with two or more wire pairs, with clamping means for the strain-relieving of a connected cable, characterized in that the element is configured with mutually separated lead- in passages for the individual wire pairs of one cable, these passages generally being located with increased spread compared to their spread in the cable, and each being provided with clamping means for the securing of the wire pair led through the passage.
2. Element according to claim 1, characterized in that it consists of a termination element which can be in coupled- together connection with a strain-relieving element according to claim 1.
3. Element according to claim 1, characterized in that it is provided with a connection piece which by outwards projection or in another manner can surround the outer cable jacket with a more or less strong frictional engagement herewith, but without any appreciable clamping together of the cable.
4. Element according to claim 1 , characterized in that the element is configured with a projecting wedge part for insertion into a cable end for the support of the wire pairs in an even and outwardly-inclining manner from the cable end.
PCT/DK1999/000230 1998-04-24 1999-04-23 Strain relieved leading-in connection for signal cables with twisted wire pairs WO1999056369A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU31393/99A AU743955C (en) 1998-04-24 1999-04-23 Strain relieved leading-in connection for signal cables with twisted wire pairs
EP99913135A EP1078429B1 (en) 1998-04-24 1999-04-23 Strain relieved leading-in connection for signal cables with twisted wire pairs
DE69922949T DE69922949T2 (en) 1998-04-24 1999-04-23 ENGAGED IMPORTED CONNECTION FOR SIGNAL CABLE WITH DRILLED WIRE PAIRS
CA002329984A CA2329984C (en) 1998-04-24 1999-04-23 Strain relieved leading-in connection for signal cables with twisted wire pairs
NZ508002A NZ508002A (en) 1998-04-24 1999-04-23 Strain relieved leading-in connection for signal cables with twisted wire pairs
US09/673,252 US6599148B1 (en) 1998-04-24 1999-04-23 Strain relieved leading-in connection for signal cables with twisted wire pairs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK56898 1998-04-24
DK0568/98 1998-04-24

Publications (1)

Publication Number Publication Date
WO1999056369A1 true WO1999056369A1 (en) 1999-11-04

Family

ID=8095019

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1999/000230 WO1999056369A1 (en) 1998-04-24 1999-04-23 Strain relieved leading-in connection for signal cables with twisted wire pairs

Country Status (7)

Country Link
US (1) US6599148B1 (en)
EP (1) EP1078429B1 (en)
CA (1) CA2329984C (en)
DE (1) DE69922949T2 (en)
ES (1) ES2235471T3 (en)
NZ (1) NZ508002A (en)
WO (1) WO1999056369A1 (en)

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GB2511913A (en) * 2013-01-23 2014-09-17 Commscope Inc Communications connectors including transmission lines and related methods
US9905973B2 (en) 2013-01-23 2018-02-27 Commscope, Inc. Of North Carolina Communications connectors including transmission lines having impedance discontinuities that improve return loss and/or insertion loss performance and related methods

Families Citing this family (7)

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US6811445B2 (en) 2002-04-22 2004-11-02 Panduit Corp. Modular cable termination plug
JP4199961B2 (en) * 2002-06-26 2008-12-24 ヒロセ電機株式会社 Modular plug
US20070293097A1 (en) * 2006-06-15 2007-12-20 Tyco Electronics Corporation Modular plug electrical connector
CN102025038B (en) * 2009-09-23 2013-03-27 台达电子工业股份有限公司 Module structure of power supply connector
CN101800380B (en) * 2010-02-09 2012-05-23 永泰电子（东莞）有限公司 Network wire plug, network wire plug pair and network wire
US8979553B2 (en) * 2012-10-25 2015-03-17 Molex Incorporated Connector guide for orienting wires for termination
US9923323B2 (en) * 2015-10-30 2018-03-20 Apple Inc. Cable assemblies, systems, and methods for making the same

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GB2197089A (en) * 1986-11-03 1988-05-11 Gen Electric Optical fiber holder
WO1993026071A1 (en) * 1992-06-16 1993-12-23 Raychem Corporation Enclosure assembly for telecommunication cables
US5568584A (en) * 1995-03-20 1996-10-22 Psi Telecommunications, Inc. Fiber optic closure with cable adapter spool
WO1997047063A1 (en) * 1996-06-05 1997-12-11 Pouyet S.A. Device for mounting at least one cable in a disc to be located in a cable connection protection sleeve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2511913A (en) * 2013-01-23 2014-09-17 Commscope Inc Communications connectors including transmission lines and related methods
GB2511913B (en) * 2013-01-23 2015-09-02 Commscope Inc Communications connectors including transmission lines and related methods
US9209569B2 (en) 2013-01-23 2015-12-08 Commscope, Inc. Of North Carolina Communications connectors including transmission lines having impedance discontinuities that improve return loss and/or insertion loss performance and related methods
US9905973B2 (en) 2013-01-23 2018-02-27 Commscope, Inc. Of North Carolina Communications connectors including transmission lines having impedance discontinuities that improve return loss and/or insertion loss performance and related methods
US10270210B2 (en) 2013-01-23 2019-04-23 Commscope, Inc. Of North Carolina Communications connectors including transmission lines having impedance discontinuities that improve return loss and/or insertion loss performance and related methods

Also Published As

Publication number Publication date
CA2329984C (en) 2008-07-15
AU743955B2 (en) 2002-02-07
CA2329984A1 (en) 1999-11-04
DE69922949D1 (en) 2005-02-03
AU3139399A (en) 1999-11-16
US6599148B1 (en) 2003-07-29
EP1078429B1 (en) 2004-12-29
ES2235471T3 (en) 2005-07-01
NZ508002A (en) 2003-08-29
EP1078429A1 (en) 2001-02-28
DE69922949T2 (en) 2005-12-15

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