EP0668630B1 - Connection box for a plurality of shielded cables - Google Patents

Connection box for a plurality of shielded cables Download PDF

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Publication number
EP0668630B1
EP0668630B1 EP95400318A EP95400318A EP0668630B1 EP 0668630 B1 EP0668630 B1 EP 0668630B1 EP 95400318 A EP95400318 A EP 95400318A EP 95400318 A EP95400318 A EP 95400318A EP 0668630 B1 EP0668630 B1 EP 0668630B1
Authority
EP
European Patent Office
Prior art keywords
cable
plate
cables
holes
screen
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.)
Expired - Lifetime
Application number
EP95400318A
Other languages
German (de)
French (fr)
Other versions
EP0668630A1 (en
Inventor
Michel Mehez
Bernard Warusfel
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.)
Alcatel Lucent SAS
Original Assignee
Alcatel SA
Alcatel Alsthom Compagnie Generale dElectricite
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 Alcatel SA, Alcatel Alsthom Compagnie Generale dElectricite filed Critical Alcatel SA
Priority claimed from PCT/FR1995/001094 external-priority patent/WO1997007564A1/en
Publication of EP0668630A1 publication Critical patent/EP0668630A1/en
Application granted granted Critical
Publication of EP0668630B1 publication Critical patent/EP0668630B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0506—Connection between three or more cable ends
    • 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
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591—Specific features or arrangements of connection of shield to conductive members
    • H01R13/65912—Specific features or arrangements of connection of shield to conductive members for shielded multiconductor 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
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0515—Connection to a rigid planar substrate, e.g. printed circuit board
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/053—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables using contact members penetrating insulation

Definitions

  • the invention relates to a connection box for a plurality of shielded cables such as, for example, shielded cables intended to ensure the connection of industrial equipment transmitting or receiving data.
  • a shielded cable generally comprises several insulated conductors, surrounded by an electromagnetic screen constituted by a conductive braid.
  • a connection box is used, for example, to connect a drop cable to a main cable, for each device to be connected to the main cable.
  • connection box For a good protection of the transmitted data, it is necessary to connect together the screens of all shielded cables connected by a connection box. On the other hand, it must include a conductive enclosure forming a Faraday cage around the devices connecting the conductors transmitting the data.
  • FIP field bus
  • WORLDFIP field bus
  • standards NF C46 604 and IEC 1158-2 set physical interconnection rules allowing, on the one hand, to keep the adaptation of the data transmission lines, and on the other hand, to properly interconnect the screens of the cables, and to connect them to the ground.
  • connection box has the advantage of allowing the connection of additional equipment in an already existing network, without interrupting data traffic for a significant period.
  • this type of connection box has the disadvantages: a high cost price, large dimensions and the obligation to use a specific tool to operate the cutting device and operate the insulation displacement contacts.
  • junction boxes are unnecessarily expensive.
  • the junction box thus characterized has a reduced cost price owing to the fact that it does not comprise cable glands for fixing the cables and ensuring the interconnection of their screens, but that it comprises for the same functions a metal plate comprising some easy cutouts to machine; and self-locking cable ties which can be conventional polyamide ties, usually used to fix cables on cable trays, and which are very inexpensive.
  • each tab has a curved hook-shaped end intended to be crimped or welded on stranded conductors extracted from the screen of a cable. It is therefore easy to connect the cable screens to each other, using ordinary pliers or a soldering iron.
  • the insulated conductors that the cables comprise can be interconnected by known means, any one and inexpensive, requiring only conventional tools. For example: small insulation displacement jaws or screw terminals.
  • the housing 15, 19 is kept closed by four screws 12. It is fixed to any support by means not shown, which are screws for example. It is normally connected to a local earth connection by the fixing means on this support.
  • the operations for fixing and interconnecting the cables are carried out on the plate 8 outside the housing 15, 19.
  • the housing therefore presents no discomfort for these operations.
  • a notch not shown, allows the passage of the connection 14 through the wall of the lower part 15 of the housing.
  • Each section 1 and 18 of the main cable comprises one or more pairs of insulated conductors, 2 and 3. These pairs are shielded by a screen 4 made up of a braid of fine metallic conductors.
  • the branch cable 22 generally comprises at least two pairs of insulated conductors generally referenced 28, shielded by a screen 29 consisting of a braid of fine metallic conductors.
  • Two conductors of a first pair of the drop cable 22 are connected to a pair 2,3 of the first section 1 of the main cable, by means of two connection devices 16.
  • a second pair of the drop cable 22 is connected to a pair of the second section 18 of the main cable by two other connection devices 16.
  • the unused pairs are short-circuited at each end.
  • the four connection devices 16 can be of various known types, inexpensive and requiring no specific tools. In this example they are self-stripping jaws.
  • Some conductors of the braid constituting the screen 4 are extracted from this braid and are combined into a strand 23 which is used to connect this screen to the metal plate 8.
  • the plate 8 has a tab 25 whose end is folded back to constitute a hook 24 in which the end of the strand 23 is crimped or welded.
  • the screen 29 of the branch cable 22 is connected to the metal plate 8 in a similar manner.
  • the screen of the second section 18 of the main cable is not shown in FIG. 1, but it is connected to the metal plate 8 in a similar manner.
  • the first section 1 of the main cable is made integral with the metal plate 8, and therefore with the connection box, by means of a self-locking clamping collar 6.
  • This collar surrounds section 1, in an area where the screen 4 is not stripped, and passes through two holes drilled in the plate 8, only the hole 7 being visible in FIG. 1.
  • the self-tightening collar 6 is a conventional polyamide collar, comprising a passage 27 provided with a ratchet making it possible to pull on the end 26 of the collar but preventing return back of this end. This collar is tightened by pulling on the end 26 using flat pliers. He presses section 1 of the main cable against the plate 8, in order to make it integral with this plate.
  • the second section 18 of the main cable is fixed similarly to the plate 8, by a clamp not visible in the figure.
  • the branch cable 22 is fixed analogously to the plate 8, by means of a clamp 20.
  • the metal plate 8 has another tab 10, similar to the tab 25, making it possible to crimp or weld the second end of the earth connection, 14, and a connection of the filter 11.
  • the tabs, such as the tab 25, connect the cable screens to the plate 8, are located on one side of the plate, while the tab 10 is located on the other side of the plate.
  • FIG. 2 shows a top view of the metal plate 8 while Figure 3 shows a side view.
  • Figure 2 shows a top view of the metal plate 8 while Figure 3 shows a side view.
  • Figure 3 shows a side view.
  • Figure 4 shows the tab 46 seen from the side.
  • the other legs are similar.
  • the hook 45 comprises two half-punctures of triangular shape, 52 and 53, placed facing one another inside the hook 45 to form two reliefs improving the crimping or welding of a connection.
  • Figure 2 shows that there are two fixing holes, 31 and 7 for section 1 of the main cable; and two similar holes 37 and 38 for section 18 of the cable main; and two similar holes 33 and 34 for the branch cable 22.
  • the diameter of each of these holes is slightly greater than the width of the tongue of the cable ties, and the spacing of each pair of holes is close to the diameter of the cables to fix.
  • the plate 8 further comprises two holes 32 and 39 located approximately on a diagonal of this plate and which are intended to collaborate with two plastic spacers, 48 and 49, which are shown in side view in Figure 3.
  • the spacer 48 for example, comprises: a flexible stud 50 having a diameter slightly greater than that of the hole 39, a shoulder 51 against which the plate 8 will rest, and an adhesive base 52, fixed to the bottom of the lower part 15 of the metal case , the function of these spacers being to keep the plate 8 isolated from the conductive housing 15 and 19.
  • the plate 8 When the operations for fixing and connecting the cables are finished, the plate 8 is plugged into the pins 50 of the spacers 48 and 49 until it rests on the shoulders 51. The friction on the pins 50 is sufficient for the plate 8 is held in place against these shoulders 51.
  • the plate 8 is electrically insulated with respect to the housing 15, 19.
  • This housing 15, 19 is connected to a local earth connection for the protection of persons.
  • the plate 8 of all the connection boxes except one is generally floating relative to the earth, but is connected to the housing 15, 19 by a filter 11 letting the high frequency currents pass. Only one of the network connection boxes is actually provided with the connection 14 for connecting the plate 8 directly to an earth connection. In the other boxes the connection 14 is deleted.
  • two additional holes can be provided in the plate 8 to fix the earth connection 14, by means of a self-tightening collar, so that traction on this connection is not fully supported by the connection lug 41, 42.
  • the metal housing 15, 19 can be replaced by a plastic housing, internally metallized to form a Faraday cage.
  • This box can also be made up of more than two parts to facilitate its manufacture or assembly.
  • the cables can be provided with grommets, adapted to the diameter of passage orifices, such as 5 and 20, to improve the tightness of the housing.
  • the scope of the invention is not limited to the type of cable considered in this example, it is applicable for the connection of any cable comprising a screen; and any number of cables.

Landscapes

  • Cable Accessories (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Connection Or Junction Boxes (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Insulated Conductors (AREA)
  • Installation Of Indoor Wiring (AREA)
  • Insertion, Bundling And Securing Of Wires For Electric Apparatuses (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

The connector box is for connecting a number of screened cables (1,18,22) , each cable having an electromagnetic screen (4,29). The connection box has a device for clamping all of the cables to a metallic base plate (8) using a tightening collar (6). All of the outer screens (23) of the cables are connected to a clamping arm (24) which is connected to the base plate. The inners of the cables are connected by interconnecting connectors (16). The base plate is connected (13) to earth via a filter (11). The base plate and interconnections are enclosed in a screened box (15,19) forming a Faraday cage, with holes (5) for the cables.

Description

L'invention concerne une boîte de raccordement pour une pluralité de câbles blindés tels que, par exemple, des câbles blindés destinés à assurer le raccordement d'appareillages industriels émettant ou recevant des données. Un tel câble blindé comporte généralement plusieurs conducteurs isolés, entourés d'un écran électro-magnétique constitué par une tresse conductrice. Une boîte de raccordement est utilisée, par exemple, pour connecter un câble de dérivation sur un câble principal, pour chaque appareillage à relier au câble principal.The invention relates to a connection box for a plurality of shielded cables such as, for example, shielded cables intended to ensure the connection of industrial equipment transmitting or receiving data. Such a shielded cable generally comprises several insulated conductors, surrounded by an electromagnetic screen constituted by a conductive braid. A connection box is used, for example, to connect a drop cable to a main cable, for each device to be connected to the main cable.

Pour une bonne protection des données transmises, il est nécessaire de relier entre eux les écrans de tous les câbles blindés raccordés par une boîte de raccordement. D'autre part, celle-ci doit comporter une enceinte conductrice formant une cage de Faraday autour des dispositifs connectant les conducteurs transmettant les données. Par exemple, pour le bus de terrain connu sous le nom de FIP, et pour le bus de terrain connu sous le nom de WORLDFIP, les normes NF C46 604 et IEC 1158-2 fixent des règles d'interconnexion physique permettant, d'une part, de conserver l'adaptation des lignes de transmission de données, et d'autre part, d'interconnecter convenablement les écrans des câbles, et de les relier à la terre.For a good protection of the transmitted data, it is necessary to connect together the screens of all shielded cables connected by a connection box. On the other hand, it must include a conductive enclosure forming a Faraday cage around the devices connecting the conductors transmitting the data. For example, for the field bus known as FIP, and for the field bus known as WORLDFIP, standards NF C46 604 and IEC 1158-2 set physical interconnection rules allowing, on the one hand, to keep the adaptation of the data transmission lines, and on the other hand, to properly interconnect the screens of the cables, and to connect them to the ground.

Les demandes de brevets français n°2 666 692 et 2 666 695 décrivent des boîtes de raccordement permettant de respecter ces normes, et permettant en outre de réaliser le raccordement d'un câble de dérivation sur un câble principal sans interrompre le trafic de données sur ce câble principal, bien qu'il soit nécessaire de couper les conducteurs de la paire de ce câble principal pour dériver le trafic de données vers l'appareillage au moyen d'un première paire, puis ramener le trafic de données vers le câble principal au moyen d'une seconde paire. Ces boîtes de raccordement connues comportent :

  • un dispositif de coupure pour sectionner la paire du câble principal;
  • des contact autodénudants pour connecter une première section de la paire du câble principal à une première paire du câble de dérivation;
  • des contacts autodénudants pour connecter une seconde section de la paire du câble principal à une seconde paire du câble de dérivation;
  • des contacts autodénudants pour relier un drain qui court le long de l'écran du câble principal, à une cage de Faraday constituée par un boîtier métallique ou un boîtier isolant métallisé entourant l'ensemble des dispositifs de connexion;
  • trois presse-étoupes permettant de fixer les deux sections du câble principal et le câble de dérivation à la boîte de raccordement; et permettant de connecter à la cage de Faraday les écrans des deux sections du câble principal et l'écran du câble de dérivation.
French patent applications Nos. 2,666,692 and 2,666,695 describe connection boxes which make it possible to comply with these standards, and which also make it possible to connect a drop cable to a main cable without interrupting data traffic on this main cable, although it is necessary to cut the conductors of the pair of this main cable to divert the data traffic to the switchgear by means of a first pair, then to bring the data traffic to the main cable to the by means of a second pair. These known connection boxes include:
  • a cut-off device for cutting the pair of the main cable;
  • insulation displacement contacts for connecting a first section of the pair of the main cable to a first pair of the drop cable;
  • insulation displacement contacts for connecting a second section of the pair of the main cable to a second pair of the drop cable;
  • insulation displacement contacts to connect a drain which runs along the screen of the main cable, to a Faraday cage constituted by a metal casing or a metallized insulating casing surrounding all the connection devices;
  • three cable glands for fixing the two sections of the main cable and the branch cable to the connection box; and allowing the screens of the two sections of the main cable and the screen of the drop cable to be connected to the Faraday cage.

Une telle boîte de raccordement présente l'avantage de permettre le raccordement d'un appareillage supplémentaire dans un réseau déjà existant, sans interrompre le trafic des données pendant une durée notable. Cependant ce type de boîte de raccordement a pour inconvénients : un prix de revient élevé, des dimensions importantes et l'obligation d'utiliser un outillage spécifique pour manoeuvrer le dispositif de coupe et faire fonctionner les contacts autodénudants. Pour certaines applications, où il est sans importance de devoir interrompre le trafic de données pour raccorder des appareillages supplémentaires, ou bien pour des applications où il est à peu près certain qu'il n'y aura pas à rajouter d'appareillages supplémentaires, de telles boîtes de raccordement sont inutilement coûteuses.Such a connection box has the advantage of allowing the connection of additional equipment in an already existing network, without interrupting data traffic for a significant period. However, this type of connection box has the disadvantages: a high cost price, large dimensions and the obligation to use a specific tool to operate the cutting device and operate the insulation displacement contacts. For certain applications, where it is immaterial to have to interrupt the data traffic to connect additional devices, or for applications where it is almost certain that there will be no need to add additional devices, such junction boxes are unnecessarily expensive.

Le but de l'invention est de proposer une boîte de raccordement de prix beaucoup moins élevé, d'encombrement réduit, et pouvant être installée sans utiliser un outillage spécifique. Naturellement, cette boîte de raccordement doit satisfaire les règles d'interconnexion physique définies par les normes citées ci-dessus. Elle doit notamment permettre de connecter de manière fiable entre eux et éventuellement à la terre les écrans des deux sections d'un câble principal et d'un câble de dérivation,

  • d'autre part protéger les connexions contre les perturbations électromagnétiques en formant cage de Faraday et protéger les personnes des contacts avec les connexions et les écrans des câbles.
The object of the invention is to provide a much cheaper connection box, of reduced bulk, and which can be installed without using specific tools. Naturally, this junction box must meet the physical interconnection rules defined by the standards mentioned above. In particular, it must allow the screens of the two sections of a main cable and of a drop cable to be connected reliably and possibly to earth
  • on the other hand protect the connections against electromagnetic interference by forming a Faraday cage and protect people from contact with the connections and the cable screens.

L'objet de l'invention est une boîte de raccordement pour une pluralité de câbles blindés, chaque câble comportant un écran électro-magnétique; cette boîte comportant : des moyens pour fixer les câbles et pour relier entre eux les écrans de tous les câbles; et une enceinte conductrice formant une cage de Faraday, et comportant un orifice de passage pour chaque câble;
   caractérisée en ce que les moyens pour fixer tous les câbles et pour relier entre eux les écrans de tous les câbles comportent:

  • une plaque métallique isolée de l'enceinte conductrice formant cage de Faraday et comportant :
    • -- deux trous pour chaque câble, ces deux trous ayant un écartement voisin du diamètre de ce câble.
    • -- et une patte pour chaque câble, cette patte étant découpée dans cette plaque et étant pliée hors du plan de cette plaque, pour constituer un point de connexion pour l'écran de ce câble;
  • un collier de serrage auto-bloquant pour chaque câble, ce collier passant successivement dans les deux trous correspondant à ce câble; entourant ce câble; et le pressant contre la plaque pour le rendre solidaire de la plaque.
The object of the invention is a connection box for a plurality of shielded cables, each cable comprising an electromagnetic screen; this box comprising: means for fixing the cables and for connecting together the screens of all the cables; and a conductive enclosure forming a Faraday cage, and comprising a passage orifice for each cable;
characterized in that the means for fixing all the cables and for connecting together the screens of all the cables comprise:
  • a metal plate isolated from the conductive enclosure forming a Faraday cage and comprising:
    • - two holes for each cable, these two holes having a spacing close to the diameter of this cable.
    • - And a tab for each cable, this tab being cut out of this plate and being folded out of the plane of this plate, to constitute a connection point for the screen of this cable;
  • a self-locking clamp for each cable, this collar passing successively through the two holes corresponding to this cable; surrounding this cable; and pressing it against the plate to make it integral with the plate.

La boîte de raccordement ainsi caractérisée a un prix de revient réduit du fait qu'elle ne comporte pas de presse-étoupes pour fixer les câbles et assurer l'interconnexion de leurs écrans, mais qu'elle comporte pour les mêmes fonctions une plaque métallique comportant quelques découpes faciles à usiner; et des colliers de serrage auto-bloquants qui peuvent être des colliers classiques en polyamide, utilisés habituellement pour fixer des câbles sur des chemins de câbles, et qui sont très peu coûteux.The junction box thus characterized has a reduced cost price owing to the fact that it does not comprise cable glands for fixing the cables and ensuring the interconnection of their screens, but that it comprises for the same functions a metal plate comprising some easy cutouts to machine; and self-locking cable ties which can be conventional polyamide ties, usually used to fix cables on cable trays, and which are very inexpensive.

Selon un mode de réalisation préférentiel, chaque patte comporte une extrémité recourbée en forme de crochet et destinée à être sertie ou soudée sur des conducteurs toronnés extraits de l'écran d'un câble. Il est donc facile de connecter entre eux les écrans des câbles, au moyen d'une pince ordinaire ou d'un fer à souder. Les conducteurs isolés que comportent les câbles peuvent être interconnectés par des moyens connus, quelconques et peu coûteux, ne nécessitant qu'un outillage classique. Par exemple : des petites mâchoires autodénudantes ou des borniers à vis.According to a preferred embodiment, each tab has a curved hook-shaped end intended to be crimped or welded on stranded conductors extracted from the screen of a cable. It is therefore easy to connect the cable screens to each other, using ordinary pliers or a soldering iron. The insulated conductors that the cables comprise can be interconnected by known means, any one and inexpensive, requiring only conventional tools. For example: small insulation displacement jaws or screw terminals.

La suppression des presse-étoupes conduit à une réduction importante de l'encombrement de la boîte de raccordement. Cette réduction est encore accentuée par la suppression du dispositif de coupure, qui est inutile dans toutes les applications où il n'est pas nécessaire de minimiser la durée d'interruption du trafic de données.The elimination of cable glands leads to a significant reduction in the size of the connection box. This reduction is further accentuated by the elimination of the cut-off device, which is useless in all applications where it is not necessary to minimize the duration of interruption of data traffic.

L'invention sera mieux comprise et d'autres détails apparaîtront à l'aide de la description ci-dessous d'un exemple de réalisation, et des figures l'accompagnant :

  • la figure 1 représente une vue d'ensemble d'un exemple de réalisation de la boîte de raccordement selon l'invention, une partie de son boîtier étant supprimée pour permettre de voir l'intérieur;
  • la figure 2 représente une vue de dessus de la plaque métallique seule, dans cet exemple de réalisation;
  • la figure 3 représente une vue de côté de cette plaque métallique et de deux entretoises en matière isolante destinées à la supporter et la tenir isolée de l'enceinte conductrice formant cage de Faraday;
  • la figure 4 représente l'une des pattes découpées dans cette plaque.
The invention will be better understood and other details will appear with the aid of the description below of an exemplary embodiment, and of the accompanying figures:
  • FIG. 1 represents an overall view of an exemplary embodiment of the connection box according to the invention, a part of its housing being removed to allow the interior to be seen;
  • FIG. 2 represents a top view of the metal plate alone, in this exemplary embodiment;
  • 3 shows a side view of this metal plate and two spacers of insulating material intended to support it and keep it isolated from the conductive enclosure forming Faraday cage;
  • Figure 4 shows one of the tabs cut from this plate.

L'exemple de réalisation représenté sur la figure 1 comporte :

  • une première section 1 d'un câble principal;
  • une seconde section 18 de ce câble principal;
  • un câble de dérivation 22;
  • une plaque métallique 8, ayant pour fonctions principales de fixer les câbles 1, 18, 22, et d'interconnecter leurs écrans;
  • trois colliers auto-serrants, dont deux seulement, les colliers 6 et 20, sont visibles sur la figure 1;
  • quatre dispositifs de connexion à mâchoires auto-dénudantes, 16, chacun permettant d'interconnecter deux conducteurs isolés;
  • un boîtier métallique parallélipipédique constitué de deux parties, 15 et 19, jointives le long d'une ligne 17 qui passe par trois orifices de passage des câbles 1, 18, 22; deux orifices seulement, 5 et 21, étant visibles sur la figure 1; ce boîtier constituant une cage de Faraday;
  • un filtre 11, qui peut être constitué par exemple d'un condensateur et d'une varistance câblés en parallèle, reliant la plaque 8 au boîtier 15, 19 pour les courants à haute fréquence;
  • une connexion de terre, 14, comportant une cosse 13 à son extrémité, destinée à court-circuiter éventuellement le filtre 11 pour relier de façon directe la plaque 8 avec le boîtier conducteur 15 et 19.
The embodiment shown in Figure 1 includes:
  • a first section 1 of a main cable;
  • a second section 18 of this main cable;
  • a branch cable 22;
  • a metal plate 8, having the main functions of fixing the cables 1, 18, 22, and of interconnecting their screens;
  • three self-tightening collars, only two of which, collars 6 and 20, are visible in FIG. 1;
  • four connection devices with self-stripping jaws, 16, each making it possible to interconnect two insulated conductors;
  • a parallelepiped metal case made up of two parts, 15 and 19, contiguous along a line 17 which passes through three orifices for the passage of cables 1, 18, 22; only two orifices, 5 and 21, being visible in FIG. 1; this housing constituting a Faraday cage;
  • a filter 11, which may consist for example of a capacitor and a varistor wired in parallel, connecting the plate 8 to the housing 15, 19 for the high frequency currents;
  • an earth connection, 14, comprising a lug 13 at its end, intended for possibly short-circuiting the filter 11 in order to directly connect the plate 8 with the conductive housing 15 and 19.

Le boîtier 15, 19 est maintenu fermé par quatre vis 12. Il est fixé à un support quelconque par des moyens non représentés, qui sont des vis par exemple. Il est normalement relié à une prise de terre locale par les moyens de fixation sur ce support.The housing 15, 19 is kept closed by four screws 12. It is fixed to any support by means not shown, which are screws for example. It is normally connected to a local earth connection by the fixing means on this support.

Les opérations de fixation et d'interconnexion des câbles sont réalisées sur la plaque 8 hors du boîtier 15, 19. Le boîtier ne présente donc aucune gêne pour ces opérations. Une échancrure, non représentée, permet le passage de la connexion 14 à travers la paroi de la partie inférieure 15 du boîtier.The operations for fixing and interconnecting the cables are carried out on the plate 8 outside the housing 15, 19. The housing therefore presents no discomfort for these operations. A notch, not shown, allows the passage of the connection 14 through the wall of the lower part 15 of the housing.

Chaque section 1 et 18 du câble principal comporte une ou plusieurs paires de conducteurs isolés, 2 et 3. Ces paires sont blindées par un écran 4 constitué d'une tresse de fins conducteurs métalliques. Le câble de dérivation 22 comporte en général au moins deux paires de conducteurs isolés référencés globalement 28, blindées par un écran 29 constitué d'une tresse de fins conducteurs métalliques. Deux conducteurs d'une première paire du câble de dérivation 22 sont reliés à une paire 2,3 de la première section 1 du câble principal, au moyen de deux dispositifs de connexion 16. Une seconde paire du câble de dérivation 22 est reliée à une paire de la seconde section 18 du câble principal par deux autres dispositifs de connexion 16. Dans le cas de câbles comportant des paires inutilisées, les paires non utilisées sont court-circuitées à chaque extrémité. Les quatre dispositifs de connexion 16 peuvent être de divers types connus, peu coûteux et ne nécessitant pas d'outillage spécifique. Dans cet exemple ce sont des mâchoires auto-dénudantes.Each section 1 and 18 of the main cable comprises one or more pairs of insulated conductors, 2 and 3. These pairs are shielded by a screen 4 made up of a braid of fine metallic conductors. The branch cable 22 generally comprises at least two pairs of insulated conductors generally referenced 28, shielded by a screen 29 consisting of a braid of fine metallic conductors. Two conductors of a first pair of the drop cable 22 are connected to a pair 2,3 of the first section 1 of the main cable, by means of two connection devices 16. A second pair of the drop cable 22 is connected to a pair of the second section 18 of the main cable by two other connection devices 16. In the case of cables comprising unused pairs, the unused pairs are short-circuited at each end. The four connection devices 16 can be of various known types, inexpensive and requiring no specific tools. In this example they are self-stripping jaws.

Quelques conducteurs de la tresse constituant l'écran 4 sont extraits de cette tresse et sont rassemblés en un toron 23 qui est utilisé pour relier cet écran à la plaque métallique 8. La plaque 8 comporte une patte 25 dont l'extrémité est repliée pour constituer un crochet 24 dans lequel est sertie ou soudée l'extrémité du toron 23. L'écran 29 du câble dérivation 22 est relié à la plaque métallique 8 de manière analogue. L'écran de la seconde section 18 du câble principal n'est pas représenté sur la figure 1, mais il est relié à la plaque métallique 8 de manière analogue.Some conductors of the braid constituting the screen 4 are extracted from this braid and are combined into a strand 23 which is used to connect this screen to the metal plate 8. The plate 8 has a tab 25 whose end is folded back to constitute a hook 24 in which the end of the strand 23 is crimped or welded. The screen 29 of the branch cable 22 is connected to the metal plate 8 in a similar manner. The screen of the second section 18 of the main cable is not shown in FIG. 1, but it is connected to the metal plate 8 in a similar manner.

La première section 1 du câble principal est rendue solidaire de la plaque métallique 8, et donc de la boîte de raccordement, au moyen d'un collier de serrage auto-bloquant 6. Ce collier entoure la section 1, dans une zone où l'écran 4 n'est pas dénudé, et passe dans deux trous perçés dans la plaque 8, seul le trou 7 étant visible sur la figure 1. Le collier auto-serrant 6 est un collier classique en polyamide, comportant un passage 27 muni d'un cliquet permettant de tirer sur l'extrémité 26 du collier mais interdisant le retour arrière de cette extrémité. Ce collier est serré en tirant sur l'extrémité 26 au moyen d'un pince plate. Il presse la section 1 du câble principal contre la plaque 8, afin de la rendre solidaire de cette plaque.The first section 1 of the main cable is made integral with the metal plate 8, and therefore with the connection box, by means of a self-locking clamping collar 6. This collar surrounds section 1, in an area where the screen 4 is not stripped, and passes through two holes drilled in the plate 8, only the hole 7 being visible in FIG. 1. The self-tightening collar 6 is a conventional polyamide collar, comprising a passage 27 provided with a ratchet making it possible to pull on the end 26 of the collar but preventing return back of this end. This collar is tightened by pulling on the end 26 using flat pliers. He presses section 1 of the main cable against the plate 8, in order to make it integral with this plate.

La seconde section 18 du câble principal est fixée de manière analogue à la plaque 8, par un collier de serrage non visible sur la figure. Le câble de dérivation 22 est fixé de manière analogue à la plaque 8, au moyen d'un collier de serrage 20.The second section 18 of the main cable is fixed similarly to the plate 8, by a clamp not visible in the figure. The branch cable 22 is fixed analogously to the plate 8, by means of a clamp 20.

La plaque métallique 8 comporte une autre patte 10, analogue à la patte 25, permettant de sertir ou de souder la seconde extrémité de la connexion de terre, 14, et une connexion du filtre 11. Les pattes, telles que la patte 25, pour relier les écrans des câbles à la plaque 8, sont situées d'un côté de la plaque, alors que la patte 10 est située de l'autre côté de la plaque.The metal plate 8 has another tab 10, similar to the tab 25, making it possible to crimp or weld the second end of the earth connection, 14, and a connection of the filter 11. The tabs, such as the tab 25, connect the cable screens to the plate 8, are located on one side of the plate, while the tab 10 is located on the other side of the plate.

La figure 2 représente une vue de dessus de la plaque métallique 8 alors que la figure 3 montre une vue de côté. Ces figures montrent que chacune des pattes 25, 46, 10 et 36 est fabriquée en découpant une bande rectangulaire dans la plaque 8; en repliant cette bande perpendiculairement à la plaque 8; puis en recourbant l'extrémité de cette bande de façon à former un crochet, respectivement 24, 45, 40, 35.Figure 2 shows a top view of the metal plate 8 while Figure 3 shows a side view. These figures show that each of the legs 25, 46, 10 and 36 is manufactured by cutting a rectangular strip in the plate 8; by folding this strip perpendicular to the plate 8; then by bending the end of this strip so as to form a hook, respectively 24, 45, 40, 35.

La figure 4 représente la patte 46 vue de côté. Les autres pattes sont analogues. Le crochet 45 comporte deux demi-crevés de forme triangulaire, 52 et 53, plaçés en vis-à-vis à l'intérieur du crochet 45 pour constituer deux reliefs améliorant le sertissage ou le soudage d'une connexion.Figure 4 shows the tab 46 seen from the side. The other legs are similar. The hook 45 comprises two half-punctures of triangular shape, 52 and 53, placed facing one another inside the hook 45 to form two reliefs improving the crimping or welding of a connection.

La figure 2 montre qu'il est prévu deux trous de fixation, 31 et 7 pour la section 1 du câble principal; et deux trous analogues 37 et 38 pour la section 18 du câble principal; et deux trous analogues 33 et 34 pour le câble de dérivation 22. Le diamètre de chacun de ces trous est légèrement supérieur à la largeur de la languette des colliers de serrage, et l'écartement de chaque paire de trous est voisin du diamètre des câbles à fixer.Figure 2 shows that there are two fixing holes, 31 and 7 for section 1 of the main cable; and two similar holes 37 and 38 for section 18 of the cable main; and two similar holes 33 and 34 for the branch cable 22. The diameter of each of these holes is slightly greater than the width of the tongue of the cable ties, and the spacing of each pair of holes is close to the diameter of the cables to fix.

La plaque 8 comporte en outre deux trous 32 et 39 situés approximativement sur une diagonale de cette plaque et qui sont destinés à collaborer avec deux entretoises en matière plastique, 48 et 49, qui sont représentées en vue de côté sur la figure 3. L'entretoise 48, par exemple, comporte : un téton souple 50 ayant un diamètre légèrement supérieur à celui du trou 39, un épaulement 51 contre lequel reposera la plaque 8, et une base 52 adhésive, fixée au fond de la partie inférieure 15 du boîtier métallique, la fonction de ces entretoises étant de maintenir la plaque 8 isolée du boîtier conducteur 15 et 19.The plate 8 further comprises two holes 32 and 39 located approximately on a diagonal of this plate and which are intended to collaborate with two plastic spacers, 48 and 49, which are shown in side view in Figure 3. The spacer 48, for example, comprises: a flexible stud 50 having a diameter slightly greater than that of the hole 39, a shoulder 51 against which the plate 8 will rest, and an adhesive base 52, fixed to the bottom of the lower part 15 of the metal case , the function of these spacers being to keep the plate 8 isolated from the conductive housing 15 and 19.

Quand les opérations de fixation et de connexion des câbles sont terminés, la plaque 8 est enfichée sur les tétons 50 des entretoises 48 et 49 jusqu'à s'appuyer sur les épaulements 51. Le frottement sur les tétons 50 est suffisant pour que la plaque 8 soit maintenue en place contre ces épaulements 51.When the operations for fixing and connecting the cables are finished, the plate 8 is plugged into the pins 50 of the spacers 48 and 49 until it rests on the shoulders 51. The friction on the pins 50 is sufficient for the plate 8 is held in place against these shoulders 51.

Les entretoises 48 et 49 étant isolantes, la plaque 8 est électriquement isolée par rapport au boîtier 15, 19. Ce boîtier 15, 19 est relié à une prise de terre locale pour la protection des personnes. Dans un réseau, la plaque 8 de toutes les boîtes de raccordement sauf une, est en général flottante par rapport à la terre, mais est reliée au boîtier 15, 19 par un filtre 11 laissant passer les courants à haute fréquence. Une seule des boîtes de raccordement d'un réseau est effectivement munie de la connexion 14 pour relier la plaque 8 directement à une prise de terre. Dans les autres boîtes la connexion 14 est supprimée.The spacers 48 and 49 being insulating, the plate 8 is electrically insulated with respect to the housing 15, 19. This housing 15, 19 is connected to a local earth connection for the protection of persons. In a network, the plate 8 of all the connection boxes except one, is generally floating relative to the earth, but is connected to the housing 15, 19 by a filter 11 letting the high frequency currents pass. Only one of the network connection boxes is actually provided with the connection 14 for connecting the plate 8 directly to an earth connection. In the other boxes the connection 14 is deleted.

Selon une variante de réalisation, deux trous supplémentaires peuvent être prévus dans la plaque 8 pour fixer la connexion de terre 14, au moyen d'un collier auto-serrant, afin qu'une traction sur cette connexion ne soit pas supportée entièrement par la patte de connexion 41, 42.According to an alternative embodiment, two additional holes can be provided in the plate 8 to fix the earth connection 14, by means of a self-tightening collar, so that traction on this connection is not fully supported by the connection lug 41, 42.

Selon des variantes de réalisation, le boîtier métallique 15, 19 peut être remplacé par un boîtier en matière plastique, métallisé intérieurement pour constituer une cage de Faraday. Ce boîtier peut en outre être constitué de plus de deux pièces pour faciliter sa fabrication ou son montage. Les câbles peuvent être munis de passe-fils, adaptés au diamètre de orifices de passage, tels que 5 et 20, pour améliorer l'étanchéité du boîtier.According to alternative embodiments, the metal housing 15, 19 can be replaced by a plastic housing, internally metallized to form a Faraday cage. This box can also be made up of more than two parts to facilitate its manufacture or assembly. The cables can be provided with grommets, adapted to the diameter of passage orifices, such as 5 and 20, to improve the tightness of the housing.

La portée de l'invention n'est pas limitée au type de câble considéré dans cet exemple, elle est applicable pour le raccordement de tout câble comportant un écran; et à un nombre de câbles quelconques.The scope of the invention is not limited to the type of cable considered in this example, it is applicable for the connection of any cable comprising a screen; and any number of cables.

Claims (4)

  1. Junction box for connecting a plurality of screened cables (1, 18, 22) each having an electromagnetic screen (4, 29), said box including means for fixing the cables, means for interconnecting screens of all the cables and a conductive enclosure (15, 19) forming a Faraday cage and including an opening (5, 21) for each cable;
       characterised in that the means for fixing all the cables and the means for interconnecting the screens (4, 29) of all the cables include:
    - a metal plate (8) incorporating:
    -- two holes (7, 31) for each cable, the distance between the two holes being similar to the diameter of the cable; and
    -- a lug (24, 25) for each cable, cut out from the plate and bent out of the plane of the plate to constitute a connection point for the screen (4, 29) of the cable; and
    - a self-locking tie (6, 26, 27) for each cable passing successively through the two holes (7, 31) corresponding to the cable, fitting around the cable and pressing it against the plate (8) to attach it to the plate.
  2. Junction box according to claim 1 characterised in that each lug (24, 25) has a curved end (24) forming a hook adapted to be crimped or soldered to conductors (23) extracted from the screen (4) of a cable (1) and twisted together.
  3. Junction box according to claim 1 characterised in that the metal plate (8) further includes at least one additional lug (10) cut out from the plate and bent out of the plane of the plate to constitute a connection point for an earth conductor (14) and/or for an earth filter (11).
  4. Junction box according to claim 1 characterised in that the enclosure (15, 19) forming a Faraday cage includes at least two contiguous parts (15, 19) and the two parts have a joint line (17) which passes through all the cable openings (5, 21).
EP95400318A 1994-02-18 1995-02-15 Connection box for a plurality of shielded cables Expired - Lifetime EP0668630B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9401880 1994-02-18
FR9401880A FR2716580B1 (en) 1994-02-18 1994-02-18 Connection box for a plurality of shielded cables.
PCT/FR1995/001094 WO1997007564A1 (en) 1994-02-18 1995-08-17 Junction box for multiple shielded cables

Publications (2)

Publication Number Publication Date
EP0668630A1 EP0668630A1 (en) 1995-08-23
EP0668630B1 true EP0668630B1 (en) 1997-11-12

Family

ID=9460230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95400318A Expired - Lifetime EP0668630B1 (en) 1994-02-18 1995-02-15 Connection box for a plurality of shielded cables

Country Status (8)

Country Link
US (1) US5575667A (en)
EP (1) EP0668630B1 (en)
JP (1) JP3378109B2 (en)
AT (1) ATE160241T1 (en)
DE (1) DE69501004T2 (en)
DK (1) DK0668630T3 (en)
ES (1) ES2109053T3 (en)
FR (1) FR2716580B1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5768771A (en) * 1996-03-01 1998-06-23 Molex Incorporated System for terminating the shield of a high speed cable
DE19717627A1 (en) * 1997-04-25 1998-10-29 Amphenol Tuchel Elect Shield clamp connection
DE19743353A1 (en) * 1997-09-30 1998-09-24 Siemens Ag Electrical contacting arrangement e.g. for cable shields of communications equipment
US6314182B1 (en) * 1998-08-19 2001-11-06 3M Innovative Properties Company External filter box
JP2001135419A (en) * 1999-11-09 2001-05-18 Auto Network Gijutsu Kenkyusho:Kk Method of treating end of shielded cable and construction for end treatment
DE20000093U1 (en) * 2000-01-04 2001-05-17 Weidmueller Interface Connection element for connecting shield cables
US8891228B2 (en) * 2011-02-28 2014-11-18 Hubbell Incorporated Enclosure system and method for facilitating installation of electrical equipment
US10490915B2 (en) * 2017-06-07 2019-11-26 Mitas Electronics, Llc Gaussian chamber cable direct connector
CN107611636B (en) * 2017-09-08 2023-08-29 厦门唯恩电气有限公司 Split type metal junction box with electromagnetic shielding function
US20190348793A1 (en) * 2018-05-08 2019-11-14 Astronics Advanced Electronic Systems Corp. Outlet Incorporating an Outlet Modular Enclosure and a Snap-In / Snap-Out Outlet Unit
FR3095905B1 (en) 2019-05-07 2022-04-01 Nexans INSTALLATION FOR HIGH VOLTAGE ELECTRICAL CABLES
DE102020108509B4 (en) * 2020-03-27 2024-01-11 Auto-Kabel Management Gmbh Electrically shielded housing

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Publication number Priority date Publication date Assignee Title
US3848224A (en) * 1973-06-15 1974-11-12 C Olivero Pre-wired switch box
US4533197A (en) * 1983-05-18 1985-08-06 Prince Thomas F Junction block for shielded communications network line
US4790775A (en) * 1988-02-09 1988-12-13 E. I. Du Pont De Nemours And Company Transition connector
FR2647970B1 (en) * 1989-05-31 1991-08-16 Cegelec CONNECTION TAKE FOR CABLE, ESPECIALLY FOR PAIR ARMORED CABLE
FR2655779B1 (en) * 1989-12-12 1992-01-17 Entrelec Sa CONNECTOR FOR ELECTROMAGNETICALLY SHIELDED MULTICONDUCTOR CABLE.
FR2666695B1 (en) * 1990-09-07 1994-03-18 Cegelec CONNECTOR FOR MOUNTED PAIR TYPE CABLE WITH GROUND DRAIN.

Also Published As

Publication number Publication date
JPH07264749A (en) 1995-10-13
ES2109053T3 (en) 1998-01-01
DE69501004D1 (en) 1997-12-18
FR2716580B1 (en) 1996-04-12
US5575667A (en) 1996-11-19
EP0668630A1 (en) 1995-08-23
ATE160241T1 (en) 1997-11-15
JP3378109B2 (en) 2003-02-17
DK0668630T3 (en) 1997-12-22
DE69501004T2 (en) 1998-03-12
FR2716580A1 (en) 1995-08-25

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