EP1516394B1 - Contact device for the electric contact of cable shields - Google Patents
Contact device for the electric contact of cable shields Download PDFInfo
- Publication number
- EP1516394B1 EP1516394B1 EP03735360A EP03735360A EP1516394B1 EP 1516394 B1 EP1516394 B1 EP 1516394B1 EP 03735360 A EP03735360 A EP 03735360A EP 03735360 A EP03735360 A EP 03735360A EP 1516394 B1 EP1516394 B1 EP 1516394B1
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- EP
- European Patent Office
- Prior art keywords
- contact
- cable
- contact device
- cutting teeth
- electrical
- 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
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Images
Classifications
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- 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
- H01R13/65917—Connection to shield by means of resilient members
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
- H01R4/2404—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation
- H01R4/2408—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation actuated by clamping screws
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
-
- 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
- H01R9/031—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for multiphase cables, e.g. with contact members penetrating insulation of a plurality of conductors
Definitions
- the invention relates to a contact device for electrical cables with a cable shield arcuate contact part, which is around the cable sheath of the cable according to the preamble of claim 1.
- a contact device for electrical cables with a cable shield arcuate contact part, which is around the cable sheath of the cable according to the preamble of claim 1.
- Such a contact device is known from US 4,696,908 known.
- US 5,636,306 is a ground terminal for optical fibers known.
- the earthing terminal consists of a frame part connected to a protective conductor and pairs of opposing handle elements which are guided in the frame part.
- the grip elements form in an assembly position an opening into which an optical waveguide can be threaded.
- the gripping elements are each provided with radially inwardly directed teeth, which are pressed in a fastening position by a clamping device on the metallic sheathing of the optical waveguide.
- an electrical contact is made with the protective conductor.
- Devices connected to the optical fiber are protected from static electricity and lightning by the grounding.
- the disadvantage is that the contact device consists of a large number of individual parts and is therefore expensive to manufacture.
- Object of the present invention is to provide a contact device for electrical cables, which does not require stripping, which allows reliable contact and strain relief and is suitable for the production in large quantities.
- each contact element is tapered towards a tip formed so that it penetrates the cable sheath when setting in a substantially radially inward thrust direction and makes electrical contact with the cable shield.
- the invention is based on the knowledge that it is advantageous for reliable contacting and strain relief when the cable sheath is pierced by the contact elements and is not cut through by blades as in the prior art. This reduces the risk of damage to the insulation of the inner individual wires.
- the protective cable sheath is only damaged in those areas where the contact elements penetrate. In the area of penetration, the cable sheath seals against the contact elements. This seal ensures that each contact point is better protected against outside air and moisture. This protection reduces the formation of oxide layers between the contact partners. For devices of communication technology, which often have a minimum useful life of many years This reliable and long-term stable ground connection of the cable shield is very advantageous.
- the contact resistance over the entire service life can be kept equally low by the invention.
- the handling of the contact device according to the invention is simple. It is clamped around the cable sheath and fixed, for example by a screw on a support. When setting the electrical contact and the mechanical strain relief is made simultaneously. As the sheath is pierced and not cut through, the risk of inadvertently damaging the insulation of the individual cores enclosed by the shed when contacting the shroud is reduced. A costly stripping of the cable is not required.
- the contact device according to the invention can be mounted within a comparatively short time. Both the shape and the design of the contact elements can be designed differently.
- the contact elements may be formed for example by tapered cones or pyramids. In the contact area a plurality of axially spaced rows of contact elements may be provided. It is only crucial that the cable sheath is not cut through but pierced, whereby the remaining between the contact elements of the jacket remains intact. The strain relief takes place in the jacket of the cable and is flexible. In the area of penetration, the sealing effect due to elastic bias is maintained even when mechanical stresses act on the cable. In the clamped state, the tips of the contact elements remain radially spaced from the individual wires. As a result, it does not affect the insulation property of the Single cores when a mechanical tensile force is introduced with a radially directed force component on the cable.
- the contact elements of the fixed contact part penetrate the cable sheath in such a way that the electrical contact is produced in a surface running essentially concentrically in the cable.
- the electrical contact and the mechanical strain relief is divided evenly over several contact elements. Both effects are reliably maintained even in harsh operating environments.
- a simple embodiment of the invention results when the contact part is designed as a cable clamp and the contact elements are formed by cutting teeth of a ring gear.
- the fixed cable clamp is centered by radially arranged on the inside between the cutting teeth stops.
- the stops limit the penetration depth of the contact elements. It does not come to an oval deformation of the cable cross-section, with the result of irregularly deeply penetrated contact elements. This is particularly advantageous in cables whose sheath consists of a comparatively soft elastic plastic, and whose screen consists of an easily pierceable coiled, thin film or of a thin metal braid.
- the cable clamp is made of a stamped and bent part and the cutting teeth are formed from radially inwardly bent edges of a sheet metal blank. It is advantageous if the cutting teeth are triangular in shape and the tips are arranged at the same circumferential distance.
- the cutting teeth are matched to the thickness of the shell. This is done by a design, wherein the cutting teeth have a tooth height that is less than or equal to a total thickness formed from the thickness of the cable sheath and the cable shield, is. This makes it obvious that the insulation of the individual wires is not damaged.
- a radial stop can be produced in a simple manner by the cutting teeth are circumferentially arranged on the gap.
- the stop may also be different, for example, be prepared by radially inwardly directed spurs.
- the contact part together with the cutting teeth is made in one piece and of the same material from a metallic material.
- Oxidation of the contact elements can be inexpensively prevented by a coating of corrosion-resistant material, preferably with tin. But it may also be advantageous if the contact part is made of a corrosion-resistant material.
- the mechanical strength of the contact device can be improved by stiffening, which are designed for example as beads or ribs. This is particularly advantageous if the contact device according to the invention is used in an electrical device which is exposed to strong shocks during operation. Since in addition to the contact at the same time also a strain relief, eliminating additional clamps and cable clips. Of course, a plurality of contact devices may be provided on a line.
- the attachment to a support member can be done by screw, creating a cost-effective, robust and long-term stable ground connection between the shield of the cable and the housing ground is created.
- the contact part is molded while leaving contact surfaces with a polymeric or elastomeric material.
- the rubber-elastic sheathing of the sharp-edged stamped part reduces the risk of damage to the cable sheath in the area of the clamping point.
- mechanical vibrations in the area of the clamping point are also damped.
- This damping characteristic is particularly desirable if the cable is attached to a backplane, a so-called backplane, which can absorb mechanical vibrations in continuous operation only to a limited extent.
- the casing creates corrosion protection on the outside.
- the contact device according to the invention is preferably used in electrical devices, in particular in telecommunications systems.
- electrical devices in particular in telecommunications systems.
- systems of switching technology and in PBX systems are usually a variety of electrical cables reliably connect to the ground potential of a rack. Not only are these systems subject to a high level of screening requirements, but the ohmic resistance of the ground connection must be maintained at a low level over a comparatively long operating period.
- FIGS. 2 to 6 exemplary embodiments of the contact device according to the invention are reproduced.
- FIG. 1 shows first in a perspective view of a known contact device 1 for an electric cable 2 as it is commonly used in telecommunications equipment.
- the cable 2 connects in FIG. 1 external, not shown, main manifolds with various assemblies that are connected via a backplane and arranged in a housing.
- Such cables are usually made of insulated Single cores, which are twisted and which are surrounded by a common screen 9, for example: a coiled aluminum foil or a metallic braid.
- the screen 9 lies directly on the individual wires.
- the cable 2 protects a plastic jacket 8, which is usually made of PVC or rubber.
- the cable shield 9 prevents the interference of electromagnetic interference on the individual wires.
- the cable sheath 8 is stripped at one point.
- the stripping is usually done manually.
- the cable sheath 8 is opened and removed in a contacting area.
- the screen 9 of the cable 2 is thereby exposed.
- a cable clamp 6 is clamped around the film or the braid of the screen 9 and secured by means of a screw 7 electrically conductive to the backplane of the device.
- FIG. 2 is shown in a perspective view of a first embodiment of the invention.
- the illustration shows the contact device 1 in the assembled state.
- the contact part 3 is designed as a cable clamp 6.
- the contact elements 5, in the representation of FIG. 2 are not visible, pierce the jacket 8 of the cable 2 in a substantially radially inwardly directed thrust direction and establish an electrical contact with the screen 9 in the interior of the cable 2. Stripping the cable sheath is not required.
- the cable clamp 6 is clamped around the jacket 8 and fixed. By means of a screw connection 7, the attachment takes place on a support 11. In this way, not only a contact of the screen, but at the same time a strain relief of the cable is created.
- By concerns of the foot parts 17 and stops 18 it is ensured that the insulation of the individual wires 10 remains intact.
- FIG. 3 shows the cable clamp 6 in a non-mounted state without cables.
- border areas are punched claw-like.
- these claw-like Austanzungen are bent and have radially inward. They form the contact elements 5.
- They are formed in the illustrated embodiment in the form of cutting sprockets 15.
- the tips 13 of the cutting teeth 12 are formed by embossing a sheet metal stamped part.
- the ends of the contact part 3 each open into a foot part 17, which is provided with a bore through which the cable clamp 6 can be fastened by means of a screw connection.
- the contact elements 5 are designed so that they touch the screen 9 or slightly penetrate.
- the screen 9 touches or surrounds the tips 13 of the teeth 12. Since the contact is divided into several points and each point is sealed to the outside, reliable, long-term stable electrical contact between the cable clamp 6 and the screen 9 is achieved produced.
- FIG. 5 In the FIG. 5 is shown in a perspective view a cable clamp 6 with superimposed individual wires 10.
- the cutting teeth 12 of the front sprocket 15 are visible in the partially sectioned view.
- the height of a tooth 12 is marked H.
- the cable sheath has a thickness DM.
- the screen thickness is marked with the reference DS.
- the teeth 12 are arranged on a gap. Each gap between two cutting teeth 12 forms a stop 18 in the foot region. When the contact device is fixed, these stops 18 bring about a stop centering. This ensures that the circular cross section of the cable 2 when attaching the cable clamp 6 is not sirund squeezed.
- each cutting tooth 12 is smaller than or equal to a total thickness D, formed from the jacket thickness DM and the screen thickness DS is, ie D is smaller than DM + DS, it is ensured that the insulation of the individual wires is not damaged by the SchirmKey ist.
- the above-explained basic principle of a contact device is also applicable to an arrangement with several cables.
- this is shown in a second embodiment as a multiple cable clamp.
- the contact part 3 has, for example, three arcuate sections 4, each of which encloses an electrical cable 2 in a clamping manner.
- the definition of this multiple cable clamp can be done again as shown above by screw on a support.
Landscapes
- Insulated Conductors (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Description
Die Erfindung betrifft eine Kontakteinrichtung für elektrische Kabel mit einem Kabelschirm bogenförmiges Kontaktteil, das um den Kabelmantel des Kabels gemäß dem Oberbegriff des Anspruches 1. Eine derartige Kontakteinrichtung ist aus der
Um den Schirm eines elektrischen Kabels zu kontaktieren und eine Verbindung mit einem Massepotenzial eines Gehäuses herzustellen ist es üblich, die Isolation des Kabels längs eines Abschnittes zu entfernen und den freigelegten Schirm mittels einer elektrisch leitfähigen Kabelschelle oder Kabelklemme an einem Gehäuseteil zu befestigen. Das Entfernen des Kabelmantels erfolgt meist manuell, ist zeitaufwendig und birgt die Gefahr in sich, dass die Isolation der unter dem Kabelmantel liegenden Einzeladern beschädigt wird.
Neben der Kontaktierung der Schirmung des Kabels wird häufig gleichzeitig auch eine Zugentlastung des Kabels gewünscht. Bei einem abisolierten Kabel werden die Zugkräfte aber über die Klemmung des Schirms direkt auf die Kabellitzen übertragen. Die Einzeladern können aber nur in geringem Ausmaß mechanische Kräfte aufnehmen.In order to contact the screen of an electrical cable and connect to a chassis ground potential, it is common practice to remove the insulation of the cable along a section and secure the exposed screen to a chassis member by means of an electrically conductive cable clamp or cable clamp. The removal of the cable sheath is usually done manually, is time consuming and involves the risk that the insulation of the individual cores lying under the cable sheath is damaged.
In addition to the contacting of the shielding of the cable is often desired at the same time a strain relief of the cable. In the case of a stripped cable, however, the tensile forces are transferred directly to the cable strands via the clamping of the shield. The individual wires can absorb mechanical forces only to a small extent.
Zur elektrischen Kontaktierung und zum Befestigen einer elektrischen Leitung sind unterschiedliche Vorrichtungen bekannt.For electrical contacting and for securing an electrical line different devices are known.
Aus
Aus
Zur Befestigung einer Leitung an einer Wand oder an einer Abstützung ist aus
Aufgabe der vorliegenden Erfindung ist es, eine Kontakteinrichtung für elektrische Kabel zu schaffen, die ohne Abisolierung auskommt, die eine zuverlässige Kontaktierung und Zugentlastung ermöglicht und für die Herstellung in großen Stückzahlen geeignet ist.Object of the present invention is to provide a contact device for electrical cables, which does not require stripping, which allows reliable contact and strain relief and is suitable for the production in large quantities.
Diese Aufgabe wird bei einer erfindungsgemäßen Kontakteinrichtung mit den kennzeichnenden Merkmalen des Patentanspruchs 1 gelöst. Auf vorteilhafte Ausgestaltungen der Erfindung nehmen die Unteransprüche Bezug.This object is achieved in a contact device according to the invention with the characterizing features of claim 1. In advantageous embodiments of the invention, the dependent claims relate.
Bei der erfindungsgemäßen Köntakteinrichtungen ist vorgesehen, dass jedes Kontaktelement auf eine Spitze hin zulaufend so ausgebildet ist, dass es beim Festlegen in einer im wesentlichen radial nach innen gerichteten Stoßrichtung den Kabelmantel durchstößt und einen elektrischen Kontakt mit dem Kabelschirm herstellt.In the Köntakteinrichtungen invention is provided that each contact element is tapered towards a tip formed so that it penetrates the cable sheath when setting in a substantially radially inward thrust direction and makes electrical contact with the cable shield.
Dabei geht die Erfindung von der Kenntnis aus, dass es für eine zuverlässige Kontaktierung und Zugentlastung vorteilhaft ist, wenn der Kabelmantel durch die Kontaktelemente durchstoßen wird und nicht wie im Stand der Technik durch Klingen durchschnitten wird. Dadurch verringert sich die Gefahr der Beschädigung der Isolierung der innenliegenden Einzeladern. Der schützende Kabelmantel ist nur in jenen Bereichen verletzt, in denen die Kontaktelemente eindringen. Im Bereich der Durchdringung liegt der Kabelmantel an den Kontaktelementen dichtend an. Diese Dichtung bewirkt, dass jede Kontaktstelle vor von außen eindringender Luft und Feuchtigkeit besser geschützt ist. Dieser Schutz verringert die Ausbildung von Oxydschichten zwischen den Kontaktpartnern. Bei Geräten der Kommunikationstechnik, die oft eine Mindestnutzungsdauer von vielen Jahren aufweisen müssen, ist diese zuverlässige und langzeitstabile Masseverbindung des Kabelschirms sehr vorteilhaft. Insbesondere dann, wenn diese Geräte unter rauen Umgebungsbedingungen mit Temperaturschwankungen betrieben werden und die Kontaktstelle mechanischen Spannungen ausgesetzt ist, kann durch die Erfindung der Kontaktwiderstand über die gesamte Nutzungsdauer gleich niedrig gehalten werden.
Die Handhabung der erfindungsgemäße Kontakteinrichtung ist einfach. Sie wird um den Kabelmantel geklemmt und beispielsweise durch eine Schraubverbindung an einem Träger festgelegt. Beim Festlegen wird gleichzeitig der elektrische Kontakt und die mechanische Zugentlastung hergestellt. Da der Mantel durchstoßen und nicht durchschnitten wird, verringert sich die Gefahr, dass beim Kontaktieren des Schirms unbeabsichtigt auch die Isolation der vom Schirm umschlossenen Einzeladern beschädigt wird. Ein kostenintensives Abmanteln des Kabels ist nicht erforderlich. Die erfindungsgemäße Kontakteinrichtung kann innerhalb einer vergleichsweise sehr kurzen Zeit montiert werden. Sowohl die Form als auch die Ausgestaltung der Kontaktelemente können unterschiedlich ausgeführt sein. Die Kontaktelemente können beispielsweise durch spitz zulaufende Kegel oder Pyramiden gebildet sein. Im Kontaktbereich können mehrere axial beabstandete Reihen von Kontaktelementen vorgesehen sein. Entscheidend ist lediglich, dass der Kabelmantel nicht durchschnitten sondern durchstoßen wird, wodurch der zwischen den Kontaktelementen verbleibende Bereich des Mantels unversehrt bleibt. Die Zugentlastung findet im Mantel des Kabels statt und ist flexibel. Im Bereich der Durchdringung bleibt die Dichtwirkung aufgrund elastischer Vorspannung auch dann erhalten, wenn mechanische Beanspruchungen auf das Kabel einwirken. Im festgeklemmten Zustand bleiben die Spitzen der Kontaktelemente radial beabstandet zu den Einzeladern. Dadurch kommt es auch dann nicht zu Beeinträchtigung der Isolationseigenschaft der Einzeladern, wenn eine mechanische Zugkraft mit einer radial gerichteten Kraftkomponente auf das Kabel eingeleitet wird.The invention is based on the knowledge that it is advantageous for reliable contacting and strain relief when the cable sheath is pierced by the contact elements and is not cut through by blades as in the prior art. This reduces the risk of damage to the insulation of the inner individual wires. The protective cable sheath is only damaged in those areas where the contact elements penetrate. In the area of penetration, the cable sheath seals against the contact elements. This seal ensures that each contact point is better protected against outside air and moisture. This protection reduces the formation of oxide layers between the contact partners. For devices of communication technology, which often have a minimum useful life of many years This reliable and long-term stable ground connection of the cable shield is very advantageous. In particular, when these devices are operated under harsh environmental conditions with temperature fluctuations and the contact point is exposed to mechanical stresses, the contact resistance over the entire service life can be kept equally low by the invention.
The handling of the contact device according to the invention is simple. It is clamped around the cable sheath and fixed, for example by a screw on a support. When setting the electrical contact and the mechanical strain relief is made simultaneously. As the sheath is pierced and not cut through, the risk of inadvertently damaging the insulation of the individual cores enclosed by the shed when contacting the shroud is reduced. A costly stripping of the cable is not required. The contact device according to the invention can be mounted within a comparatively short time. Both the shape and the design of the contact elements can be designed differently. The contact elements may be formed for example by tapered cones or pyramids. In the contact area a plurality of axially spaced rows of contact elements may be provided. It is only crucial that the cable sheath is not cut through but pierced, whereby the remaining between the contact elements of the jacket remains intact. The strain relief takes place in the jacket of the cable and is flexible. In the area of penetration, the sealing effect due to elastic bias is maintained even when mechanical stresses act on the cable. In the clamped state, the tips of the contact elements remain radially spaced from the individual wires. As a result, it does not affect the insulation property of the Single cores when a mechanical tensile force is introduced with a radially directed force component on the cable.
Es ist von besonderem Vorteil, wenn die Kontaktelemente des festgelegten Kontaktteils den Kabelmantel so durchdringen, dass der elektrische Kontakt in einer im wesentlichen konzentrisch im Kabel verlaufenden Fläche hergestellt wird. Dadurch ist die elektrische Kontaktierung und die mechanische Zugentlastung gleichmäßig auf mehrere Kontaktelemente aufgeteilt. Beide Wirkungen bleiben auch in rauer Betriebsumgebung zuverlässig erhalten.It is of particular advantage if the contact elements of the fixed contact part penetrate the cable sheath in such a way that the electrical contact is produced in a surface running essentially concentrically in the cable. As a result, the electrical contact and the mechanical strain relief is divided evenly over several contact elements. Both effects are reliably maintained even in harsh operating environments.
Eine einfache Ausführungsform der Erfindung ergibt sich, wenn das Kontaktteil als Kabelschelle ausgebildet ist und die Kontaktelemente durch Schneidzähne eines Zahnkranzes gebildet sind.A simple embodiment of the invention results when the contact part is designed as a cable clamp and the contact elements are formed by cutting teeth of a ring gear.
Hierbei ist günstig, wenn die festgelegte Kabelschelle durch radial innenseitig zwischen den Schneidzähnen angeordneten Anschläge zentriert wird. Die Anschläge begrenzen die Eindringtiefe der Kontaktelemente. Es kommt nicht zu einer ovalen Verformung des Kabelquerschnitts, mit der Folge von unregelmäßig tief eingedrungenen Kontaktelementen. Von besonderem Vorteil ist dies bei Kabel, deren Mantel aus einem vergleichsweise weichelastischen Kunststoff besteht, und deren Schirm aus einer leicht durchstoßbaren gewendelten, dünnen Folie oder aus einem dünnen Metallgeflecht besteht.It is advantageous if the fixed cable clamp is centered by radially arranged on the inside between the cutting teeth stops. The stops limit the penetration depth of the contact elements. It does not come to an oval deformation of the cable cross-section, with the result of irregularly deeply penetrated contact elements. This is particularly advantageous in cables whose sheath consists of a comparatively soft elastic plastic, and whose screen consists of an easily pierceable coiled, thin film or of a thin metal braid.
Für die Fertigung in großen Stückzahlen ist es günstig, wenn die Kabelschelle aus einem Stanz-Biegeteil hergestellt ist und die Schneidzähne aus radial nach innen gebogenen Rändern eines Blechzuschnittes gebildet sind. Dabei ist vorteilhaft, wenn die Schneidzähne dreieckförmig ausgebildet sind und die Spitzen in gleichem Umfangsabstand angeordnet sind.For the production in large numbers, it is advantageous if the cable clamp is made of a stamped and bent part and the cutting teeth are formed from radially inwardly bent edges of a sheet metal blank. It is advantageous if the cutting teeth are triangular in shape and the tips are arranged at the same circumferential distance.
Es ist vorteilhaft, wenn die Schneidzähne auf die Dicke des Mantels abgestimmt sind. Dies erfolgt durch eine Ausführung, bei der die Schneidzähne eine Zahnhöhe aufweisen, die kleiner oder gleich einer Gesamtdicke, gebildet aus der Dicke des Kabelmantels und der des Kabelschirms, ist. Dadurch ist sichter gestellt, dass die Isolation der Einzeladern nicht verletzt wird.It is advantageous if the cutting teeth are matched to the thickness of the shell. This is done by a design, wherein the cutting teeth have a tooth height that is less than or equal to a total thickness formed from the thickness of the cable sheath and the cable shield, is. This makes it obvious that the insulation of the individual wires is not damaged.
Hierbei kann ein radialer Anschlag auf einfache Weise dadurch hergestellt werden, indem die Schneidzähne umfangsseitig auf Lücke angeordnet sind. Der Anschlag kann auch anders, beispielsweise durch radial nach innen gerichtete Sporen hergestellt sein.In this case, a radial stop can be produced in a simple manner by the cutting teeth are circumferentially arranged on the gap. The stop may also be different, for example, be prepared by radially inwardly directed spurs.
Fertigungstechnisch günstig ist es, wenn das Kontaktteil samt Schneidzähne einstückig und materialeinheitlich aus einem metallischen Werkstoff hergestellt ist.It is favorable in terms of manufacturing technology if the contact part together with the cutting teeth is made in one piece and of the same material from a metallic material.
Eine Oxydation der Kontaktelemente kann kostengünstig durch eine Beschichtung aus korrosionsbeständigem Material, vorzugsweise mit Zinn, verhindert werden. Es kann aber auch von Vorteil sein, wenn das Kontaktteil aus einem korrosionsbeständigem Material hergestellt ist.Oxidation of the contact elements can be inexpensively prevented by a coating of corrosion-resistant material, preferably with tin. But it may also be advantageous if the contact part is made of a corrosion-resistant material.
Die mechanische Festigkeit der Kontakteinrichtung kann durch Versteifungen, die beispielsweise als Sicken oder Rippen ausgeführt sind, verbessert werden. Dies ist insbesondere dann von Vorteil, wenn die erfindungsgemäße Kontakteinrichtung in einem elektrischen Gerät verwendet wird, das in Betrieb starken Erschütterungen ausgesetzt ist. Da neben der Kontaktierung gleichzeitig auch eine Zugentlastung erfolgt, entfallen zusätzliche Klemmvorrichtungen und Leitungsclips. Selbstverständlich können an einer Leitung mehrere Kontakteinrichtungen vorgesehen sein. Die Befestigung an einem Trägerteil kann durch Schraubverbindungen erfolgen, wodurch eine kostengünstige, robuste und langzeitstabile Masseverbindung zwischen dem Schirm des Kabels und der Gehäusemasse geschaffen wird.The mechanical strength of the contact device can be improved by stiffening, which are designed for example as beads or ribs. This is particularly advantageous if the contact device according to the invention is used in an electrical device which is exposed to strong shocks during operation. Since in addition to the contact at the same time also a strain relief, eliminating additional clamps and cable clips. Of course, a plurality of contact devices may be provided on a line. The attachment to a support member can be done by screw, creating a cost-effective, robust and long-term stable ground connection between the shield of the cable and the housing ground is created.
Wenn das elektrische Kabel in Betrieb starken mechanischen Beanspruchungen und rauen Umgebungsbedingungen ausgesetzt ist, kann es vorteilhaft sein, wenn das Kontaktteil unter Freilassung von Kontaktflächen mit einen polymeren oder elastomeren Werkstoff umspritzt ist. Durch die gummielastische Umhüllung des scharfkantigen Stanzteils wird die Gefahr einer Beschädigung des Kabelmantels im Bereich der Klemmstelle reduziert. In gewissem Maße werden auch mechanische Schwingungen im Bereich der Klemmstelle gedämpft. Diese Dämpfungseigenschaft ist insbesondere dann gewünscht, wenn das Kabel an einer Rückwandkarte, einer sogenannten Backplane, die im Dauerbetrieb nur in begrenztem Ausmaß mechanische Schwingungen aufnehmen kann, befestigt ist. Gleichzeitig schafft die Umhüllung außenseitig einen Korrosionsschutz.When the electrical cable is exposed in operation to strong mechanical stresses and harsh environmental conditions, it may be advantageous if the contact part is molded while leaving contact surfaces with a polymeric or elastomeric material. The rubber-elastic sheathing of the sharp-edged stamped part reduces the risk of damage to the cable sheath in the area of the clamping point. To a certain extent, mechanical vibrations in the area of the clamping point are also damped. This damping characteristic is particularly desirable if the cable is attached to a backplane, a so-called backplane, which can absorb mechanical vibrations in continuous operation only to a limited extent. At the same time, the casing creates corrosion protection on the outside.
Bevorzugt wird die erfindungsgemäße Kontakteinrichtung bei elektrischen Geräten, insbesondere bei Anlagen der Telekommunikation eingesetzt. Bei Anlagen der Vermittlungstechnik und bei Nebenstellenanlagen sind meist eine Vielzahl elektrischer Kabel zuverlässig mit dem Massepotenzial eines Baugruppenträgers zu verbinden. Bei diesen Geräten werden nicht nur hohe schirmungstechnische Anforderung gestellt, sondern der ohmsche Widerstand der Masseverbindung muss über einen vergleichsweise langen Betriebszeitraum gleich niedrig eingehalten werden.The contact device according to the invention is preferably used in electrical devices, in particular in telecommunications systems. In systems of switching technology and in PBX systems are usually a variety of electrical cables reliably connect to the ground potential of a rack. Not only are these systems subject to a high level of screening requirements, but the ohmic resistance of the ground connection must be maintained at a low level over a comparatively long operating period.
Zur weiteren Erläuterung der Erfindung wird auf die Zeichnungen Bezug genommen in deren Figuren zwei verschiedene Ausführungsformen gemäß der Erfindung schematisch dargestellt sind: Es zeigen:
- Figur 1
- eine perspektivische Ansicht einer bekannten Kontakteinrichtung für ein elektrisches Kabel,
Figur 2- eine perspektivische Ansicht einer ersten Ausführungsform der Erfindung,
Figur 3- eine perspektivische Ansicht einer Kabelschelle an deren Stirnflächen jeweils ein schneidender Zahnkranz ausgebildet ist,
Figur 4- eine perspektivische Ansicht einer Kabelschelle in einer Darstellung in der die Spitzen des Zahnkranzes eine konzentrische Kontaktfläche berühren,
Figur 5- eine perspektivische Ansicht einer Kabelschelle die um ein elektrisches Kabel geklemmt ist in teilweise aufgeschnittener Darstellung,
Figur 6- eine perspektivische Ansicht einer zweiten Ausführungsform als Mehrfachkabelschelle.
- FIG. 1
- a perspective view of a known contact device for an electrical cable,
- FIG. 2
- a perspective view of a first embodiment of the invention,
- FIG. 3
- a perspective view of a cable clamp at the end faces of each of which a cutting toothed rim is formed,
- FIG. 4
- a perspective view of a cable clamp in a representation in which the tips of the ring gear contact a concentric contact surface,
- FIG. 5
- a perspective view of a cable clamp which is clamped around an electrical cable in a partially cutaway view,
- FIG. 6
- a perspective view of a second embodiment as a multiple cable clamp.
In den Zeichnungen der
In
Die
Wie aus der Darstellung in
In der
Grundsätzlich ist das oben erläuterte Grundprinzip einer Kontakteinrichtung auch bei einer Anordnung mit mehreren Kabeln anwendbar. In
- 11
- Kontakteinrichtungcontactor
- 22
- elektrisches Kabelelectrical cable
- 33
- Kontaktteilcontact part
- 44
- bogenförmiger Abschnittarcuate section
- 55
- Kontaktelementcontact element
- 66
- Kabelschellecable clamp
- 77
- Klemmeinrichtungclamper
- 88th
- Mantel des KabelsSheath of the cable
- 99
- Schirm des KabelsScreen of the cable
- 1010
- Einzeladernindividual wires
- 1111
- Trägercarrier
- 1212
- Schneidzahncutting tooth
- 1313
- Spitzetop
- 1414
- Flächearea
- 1515
- Zahnkranzsprocket
- 1616
- Kontaktpunktcontact point
- 1717
- Fußteilfootboard
- 1818
- Anschlagattack
- HH
- Zahnhöhetooth height
- DMDM
- Dicke des MantelsThickness of the coat
- DSDS
- Dicke des SchirmsThickness of the shade
- DD
- Gesamtdicketotal thickness
Claims (13)
- Contact device for electrical cables with a cable shield, comprising an arc-shaped contact part that can be fixed around the cable sheath of the cable and is provided with contact elements that protrude radially inward, each contact element (5) being configured to run to a point (13) in such a manner that when fixed in an essentially radially inward oriented impact direction, it penetrates the cable sheath (8) and produces an electrical contact with the cable shield (9) and the contact part (3) is formed as a cable clip (6), characterised in that the contact part (3) is formed as a gear rim (15) respectively from radially inward bent edges of the cable clip (3), the cutting teeth (12) of the gear rim (15) forming the contact elements (5), the gear rim (15) having stops (18) bent radially inward between the cutting teeth (12), said stops (18) centring the cable clip (6) in the fixed state.
- Contact device according to claim 1, characterised in that the cutting teeth (12) of the fixed contact clip (6) penetrate the cable sheath (8) in such a manner that the electrical contact is produced in an essentially concentric area (14) with respect to the longitudinal axis of the cable.
- Contact device according to claim 1 or 2, characterised in that the cable clip (6) is formed from a punched and bent part of a sheet metal blank.
- Contact device according to at least one of claims 1 to 3, characterised in that the cutting teeth (12) are configured as triangular and the points (13) are arranged at equal peripheral intervals.
- Contact device according to at least one of claims 1 to 4, characterised in that the cutting teeth (12) have a tooth height (H) that is smaller than or equal to an overall thickness D, formed from a thickness (DM) of the cable sheath (8) and a thickness (D) of the cable shield (9).
- Contact device according to at least one of claims 1 to 5, characterised in that the cutting teeth (12) are arranged on the peripheral side on gaps.
- Contact device according to at least one of the preceding claims, characterised in that the contact part (3) and the cutting teeth (12) are made from one piece and from the same metallic material.
- Contact device according to at least one of the preceding claims, characterised in that the contact part (3) is coated with a corrosion-resistant material, preferably with tin.
- Contact device according to at least one of the preceding claims, characterised in that the contact part (3) is made from a corrosion-resistant material
- Contact device according to at least one of the preceding claims, characterised in that the contact part (3) is provided with a bead or rib on a side facing away from the cable (2).
- Contact device according to at least one of the preceding claims, characterised in that the contact part (3) is fixed to a support part (11) of an electrical device by a screw connection and connects the cable shield (9) electrically to the ground potential of the support part.
- Contact device according to at least one of the preceding claims, characterised in that a polymer or elastomer material is moulded around the contact part (3), leaving contact areas exposed.
- Electrical device, comprising a support for components, which are connected by shielded electrical cables, at least one cable shield of one of said cables being connected to ground potential of the support by a contact device according to one of the preceding claims.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10228754 | 2002-06-27 | ||
DE10228754A DE10228754A1 (en) | 2002-06-27 | 2002-06-27 | Contact device for electrical contacting of cable shields |
PCT/EP2003/004761 WO2004004073A1 (en) | 2002-06-27 | 2003-05-07 | Contact device for the electric contact of cable shields |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1516394A1 EP1516394A1 (en) | 2005-03-23 |
EP1516394B1 true EP1516394B1 (en) | 2008-12-03 |
Family
ID=29795905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03735360A Expired - Lifetime EP1516394B1 (en) | 2002-06-27 | 2003-05-07 | Contact device for the electric contact of cable shields |
Country Status (5)
Country | Link |
---|---|
US (1) | US7306476B2 (en) |
EP (1) | EP1516394B1 (en) |
CN (1) | CN100373700C (en) |
DE (2) | DE10228754A1 (en) |
WO (1) | WO2004004073A1 (en) |
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US7540758B2 (en) * | 2006-12-21 | 2009-06-02 | Kesse Ho | Grounding blocks and methods for using them |
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US8011950B2 (en) | 2009-02-18 | 2011-09-06 | Cinch Connectors, Inc. | Electrical connector |
US8366459B2 (en) * | 2011-03-31 | 2013-02-05 | John Mezzalingua Associates, Inc. | Compression style mid-span ground clamp |
CN202474331U (en) * | 2011-04-26 | 2012-10-03 | 3M创新有限公司 | Grounding module used for cable and grounding system used for cable |
US9350154B2 (en) | 2011-11-10 | 2016-05-24 | Thomas & Betts International Llc | Liquid-tight conduit fitting with grounding element |
US8979557B2 (en) | 2011-11-10 | 2015-03-17 | Thomas & Betts International, Inc. | Liquid-tight conduit fitting with grounding element |
DE102011056798B4 (en) * | 2011-12-21 | 2013-07-25 | Phoenix Contact Gmbh & Co. Kg | Shielded connector and method of making a shielded connector |
JP6035626B2 (en) * | 2012-06-04 | 2016-11-30 | 矢崎総業株式会社 | Mounting structure of exterior member and retrofitted parts |
US9033731B2 (en) * | 2012-07-05 | 2015-05-19 | Apple Inc. | Grounding clamp |
DE102012212574B4 (en) | 2012-07-18 | 2017-01-12 | Siemens Healthcare Gmbh | Method for electromagnetic shielding for a magnetic resonance system and correspondingly shielded device |
CN103579836B (en) * | 2012-07-21 | 2016-04-20 | 江苏荣联科技发展股份有限公司 | Bellows signal cable ground connection fastener |
DE102012111646B4 (en) * | 2012-11-30 | 2016-08-18 | HARTING Electronics GmbH | Insulating body with integrated screen element |
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EP3096405B1 (en) * | 2015-05-22 | 2019-09-18 | Tyco Electronics Raychem GmbH | Connecting element for contacting a shielding of a power cable |
CN105261845A (en) * | 2015-08-13 | 2016-01-20 | 中铁一局集团电务工程有限公司 | Combined cable shielding card |
CN105071143A (en) * | 2015-08-31 | 2015-11-18 | 南京南车浦镇城轨车辆有限责任公司 | Rectangular connector universal shield card |
JP2017138268A (en) * | 2016-02-05 | 2017-08-10 | 株式会社デンソー | Fixing apparatus |
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DE102016114734B4 (en) * | 2016-08-09 | 2018-03-08 | Lisa Dräxlmaier GmbH | Conductor holder for a vehicle and conduit assembly equipped therewith |
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CN108054528B (en) * | 2017-11-15 | 2019-08-27 | 北京光华世通科技有限公司 | A kind of EMC bonding terminal |
JP2019102360A (en) * | 2017-12-06 | 2019-06-24 | 矢崎総業株式会社 | Connection structure between electric wire and circuit board |
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USD972394S1 (en) * | 2020-09-18 | 2022-12-13 | Allied Bolt, Inc. | Prongs for a clip |
USD971711S1 (en) * | 2020-09-18 | 2022-12-06 | Allied Bolt, Inc. | Prong for a clip |
JP2022054944A (en) * | 2020-09-28 | 2022-04-07 | 日本電産株式会社 | motor |
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-
2002
- 2002-06-27 DE DE10228754A patent/DE10228754A1/en not_active Withdrawn
-
2003
- 2003-05-07 EP EP03735360A patent/EP1516394B1/en not_active Expired - Lifetime
- 2003-05-07 US US10/518,309 patent/US7306476B2/en not_active Expired - Fee Related
- 2003-05-07 WO PCT/EP2003/004761 patent/WO2004004073A1/en active Application Filing
- 2003-05-07 CN CNB038143135A patent/CN100373700C/en not_active Expired - Fee Related
- 2003-05-07 DE DE50310867T patent/DE50310867D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US20050233642A1 (en) | 2005-10-20 |
DE10228754A1 (en) | 2004-01-29 |
WO2004004073A1 (en) | 2004-01-08 |
EP1516394A1 (en) | 2005-03-23 |
US7306476B2 (en) | 2007-12-11 |
CN100373700C (en) | 2008-03-05 |
DE50310867D1 (en) | 2009-01-15 |
CN1663076A (en) | 2005-08-31 |
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