EP1744404B2 - Connecting device and connection system for insulated electric conductors - Google Patents

Abstract

The device has a one-piece housing, and multiple, one-piece contact elements held by the housing. The contact elements include two clip clamping and piercing contacts (3.1, 3.2) contacting for contacting respective conductors. Transition sections (3.3) run between the two contacts and the contact elements form contact element pairs (11). The contact elements are asymmetrically formed, so that the transition sections of the contact elements of one contact element pair are closer than the transition sections of adjacent contact elements of different pair. An independent claim is also included for a connecting system including a connecting device.

Description

The invention relates to a connection device and a connection system for a plurality of electrically insulated conductors.

For the connection of telephone or data lines in telephone exchanges or distribution systems often connecting devices, eg. Terminal strips are provided. These usually have a plurality of guides for first lines ("incoming lines"), a plurality of guides for second lines ("outgoing lines") and contact elements for connecting each of a first with a second line. Preference is given to connection devices which are provided solderless for insulated conductors and based on the Isolation Displacement Contact (IDC) technique. The contact elements then preferably each have at least two insulation displacement terminals or, less preferably, two piercing contacts or a cutting terminal and a piercing contact.

Such devices are known in a variety of embodiments, and many are available on the market. As writings showing such devices are exemplified the EP-A-0 321 151 , the DE-A-2 301 398 , and the DE-A-196 52 422 called.

From the European patent application 0 994 528 a multi-terminal block is known, which is based on the IDC technology and is characterized in that the housing is in one piece. The contact elements in addition to the insulation displacement terminals on one side (on the side of the incoming lines) also assigned a cutting edge. This makes it possible to simultaneously cut a conductor to be turned on during the wiring to the required length, without the need for a complex tool. An integral strip body is also from the US 4,964,812 known.

1. 1. Übersprechverhalten zwischen benachbarten Kontaktelement-Paaren. Dieses fällt insbesondere bei der Datenübertragung ins Gewicht. Je höher die Datenübertragungsrate, desto grösser wird die Problematik. Um die Datenübertragungssicherheit zu gewährleisten müssten daher die Kontaktelemente von Anschlussvorrichtungen für höhere Übertragungsfrequenzen möglichst weit auseinander angeordnet werden oder alle Leisten müssten mit kompensierenden Funktionalitäten ausgerüstet sein. Dies ist jedoch unerwünscht bzw. aus Platz- und Kostengründen vielfach nicht möglich.
2. 2. Einfache Beschaltbarkeit. Es besteht ein naturgemässes Bedürfnis, den Beschaltungsvorgang möglichst einfach und komfortabel zu machen. Die Notwendigkeit von komplizierten Werkzeugen ist zu vermeiden.
3. 3. Herstellungskosten. Auf dem Markt für Ausrüstungen für die Telekommunikation besteht ein enormer Preisdruck.

In connection devices of the type mentioned above, at least some of the following problems arise.

1. 1. Crosstalk behavior between adjacent contact element pairs. This is particularly significant in data transmission. The higher the data transfer rate, the greater the problem becomes. In order to ensure data transmission security, therefore, the contact elements of connection devices for higher transmission frequencies would have to be arranged as far apart as possible or all strips would have to be equipped with compensating functionalities. However, this is undesirable or often not possible due to space and cost reasons.
2. 2. Easy to connect. There is a natural need to make the wiring process as simple and comfortable as possible. The need for complicated tools is to be avoided.
3. 3. Production costs. There is enormous price pressure in the telecommunications equipment market.

In the U.S. Patent 5,556,296 and the U.S. Patent 5,160,273 ever a connection device is disclosed with a break contact. Such a separating contact consists of two separate contact elements, each with an insulation displacement contact and a resilient end contact, wherein the resilient end contacts of the two contact elements are pressed against each other by the spring force. Between the two end contacts now a separate element can be inserted. Such can be electrically insulating, whereby the circuit is separable. However, such a separate element can also be embodied, for example, as a print and perform a specific function, for example as overload protection or for removing signals. According to the two cited documents, the two contact elements are now formed asymmetrically, so that the distance of the end contacts within a release contact pair is smaller than the distance between adjacent end contacts between isolating contact pairs, whereby the crosstalk is reduced.

Similar connection devices can be found in US 5,967,826 , where also still a variant is shown, in which the two opposing contact elements are connected by a bridge with each other and thus form a one-piece, U-shaped terminal contact element.

Such connection devices with isolating contacts are advantageous for special applications because of their versatile functionality, but are complex to manufacture, consist of many individual parts and require a multi-part housing for geometric reasons. In addition - also for geometric reasons - the incoming and outgoing line on the same side of the housing and out in the same direction, which requires a precise cutting of the lines by a separate knife and can lead to uncontrolled contacts between conductors.

All devices according to the above-mentioned documents have in common that they would not be suitable for high transmission rates of, for example, 100 Mbit / s or more because of the crosstalk behavior, unless they were dimensioned very large. In addition, they are sometimes complex (i.e., expensive) to manufacture and sometimes expensive to wire,

It is therefore an object of the invention to provide a connection device which ensures a sufficient, standard data transmission security even for high transmission rates in small dimensions. Simple Beschaltbarkeit and low production costs should preferably also be guaranteed.

The inventive device according to claim 1 has a housing, which is preferably in one piece and in which a plurality of one-piece contact elements extends, each having at least a first and at least one second insulation displacement or piercing contact. Between the first and the second contact of each contact element extends a transitional part. The contact elements are arranged in pairs in a conventional manner. According to the invention, the contact elements are now asymmetric, such that the transition part is designed such that the transition parts of the two contact elements of the pairs are closer to one another than the transition parts of adjacent contact elements of different pairs.

Due to these different distances of the transition parts, the crosstalk behavior between adjacent pairs is reduced at fixed distances of the contacts. The different distances of the transition parts come about through an asymmetrical design of the contact elements, resulting in a number of advantages. A first advantage is that the insulation displacement or piercing contacts can be arranged equidistantly if required. The asymmetric shape ensures that the sections of the contact element which are mainly relevant for the crosstalk behavior - that is, those in which current flows - are nevertheless optimized, ie. between the different pairs as far as possible from each other, are arranged. This allows to meet the requirements of a higher transmission rate without changing dimensions compared to existing connection devices. For example, according to the invention, a terminal device may conform to Category 5 according to ISO / IEC 11801 (2002), and this with dimensions as known from an existing Category 3 device. Plugs, sockets, etc. of the existing system can therefore continue to be used for the higher category 5. Category 6 connection devices can also be realized with the invention in a small space, with shielding plates preferably being used between the contact element pairs for this purpose.

The inventive approach makes it possible that the housing is in one piece. The production of the housing as a single example. Injection molded part has significant advantages: the manufacturing cost is lower than in multi-part housings. The inventive structure allows easy insertion of the contact elements in the one-piece housing. For the assembly of the connection device so only chambers for the contact elements must be provided in the one-piece housing.

In addition, as a further advantage, the contact elements can be designed substantially flat and lie in a common plane. This is manufacturing technology particularly favorable: all contact elements or at least groups of contact elements can be punched together from a sheet. After possible deformations, in particular by embossing and / or shearing, they can be used together, held together by a transport strip (web), inserted into the housing.

If the contact elements have at least one substantially flat section, they are, for example, asymmetrical with respect to that plane which connects the two insulation displacement or piercing contacts and runs perpendicular to the flat section.

The contact elements have at best deviating from the flat configuration, for example, by embossing taught and protruding from the contact element level elements. Such may be formed as tongue-like detents that prevent a longitudinal displacement of the inserted into the housing contact elements. As further elements protruding from the contact element level, reinforcements may be present which increase the mechanical stability at critical points and thereby permit the use of very thin metal sheets. Such reinforcements can serve in particular to ensure the forces of the two forks of an insulation displacement contact.

The first and second conductors can run in a manner known per se in the region in which they are contacted, substantially parallel to each other and perpendicular to the contact elements. In addition, they are generally guided on opposite sides ("front" and "rear") of the housing when in contact. Although such a configuration is preferred, the invention can also be used for connection devices in which the first and second conductors are not parallel (angled connection device). This can be realized, for example, with bent contact elements.

Often, the corresponding contact elements of each contact element pair (i.e., all "left" and "right" contact elements of each pair, respectively) are identical. Each pair then contains a first and a second contact element, wherein the first and the second contact element differ by their shape or orientation. Within the contact element pair, therefore, the contact elements are not identical according to the invention when the orientation is fixed. In many preferred embodiments, however, the first and second contact element of each contact element pair are mirror images of each other.

Thus, there can be virtually two types of contact elements, "right" and "left" or first and second. The first and second contact elements may have an identical shape and differ only by orientation. That is, the second contact elements are then first contact elements, which are, for example, rotated by 180 ° about a longitudinal axis. This applies in particular in the cases in which the contact elements have no protruding from the plane elements (latches, reinforcements, etc.).

In the - for this purpose enlarged - spaces between transition sections of contact elements of adjacent pairs shielding elements can be inserted. Such are particularly advantageous in connection devices which are provided for high data transmission rates: they enable a more compact design while complying with the standards (eg category 6).

The housing may have insertion slots for the conductors in a manner known per se. By inserting insulated conductors into the insertion slots and then pressing them into the contact, the conductors are contacted because the insulation piercing tips or piercing tips of the contacts protrude into these slots. The insertion of the conductors - ie the wiring - can be done with the help of a Beschaltungswerkzeugs.

Further, the housing may have latches for attachment to a mounting channel. These can be symmetrical in such a way that a latching onto the mounting channel in two orientations is possible. In one orientation then lies a first side (for the wiring of the first, here "incoming" lines) and in the other orientation, a second side (for the wiring of the second, here "outgoing" lines) from and is thus easily accessible. Such latches are, for example, from the EP-A-0 994 528 Known to which font is explicitly referenced here, in particular FIG. 1 and their description.

According to the invention, the contact elements are each assigned two knives. By this or this excess length of a conductor is disconnected as soon as the wiring. The fact that the knife is integrated in the connection device, the Beschaltungswerkzeug can be designed very simple. Nevertheless, only one single step is necessary for connecting and disconnecting excess lengths. Solutions in which a knife is provided on the wiring tool are in contrast more complicated.

The knife or at least one knife can be provided as a separate component from the contact element. This has manufacturing advantages: The knife (or its cutting edge) must naturally meet the condition that it is provided in a different plane than the insulation displacement terminal or the piercing contact. From the prior art it is known that the knife is formed integrally with the contact element. Then, the above condition can only be met if the contact element (with cutting edge) is three-dimensional, ie not in a plane formed. After production by punching from a sheet must therefore be made according to the prior art, conversions on the element, which is expensive. Another advantage of the knife as a separate component is that the choice of material in the components contact element and knife can be optimized. For example, a harder material than the contact element can be selected in the knife.

Particularly preferred is a structure in which the contacted conductors no longer touch the knife after the Beschaltungsvorgang. Then the knife does not contribute to the crosstalk behavior, and the capacity of the assembly becomes smaller, which also minimizes losses. Also, the electric potential of the blade is then not relevant, and in principle can exist an electrical connection between the blades of adjacent contact elements. The connecting device can even be designed so that a cutting element forms a plurality of knives and may have a single, common, running transversely to the conductor direction cutting edge, which separates excess lengths of several adjacent conductors.

In addition to the housing, the contact elements and possibly the knives, the connection device may have further components.

For example, on one side (typically on the side of the second, "outgoing" conductor) a writable wiring cover may be present as a cover. Through this, the insertion slots can be covered and become, and the pairs of conductors can be labeled according to their function.

As a further additional component, the connection device - typically for the side of the first, "incoming" conductors - may be provided with a further cover, which may have a strain relief for a multi-core cable.

In addition, a gel or weather protection grease may be present in a wiring cover and / or a cover or directly in insertion slots for the conductors, which acts as corrosion protection.

• Figur 1 eine Darstellung einer erfindungsgemässen Anschlussvorrichtung mit zwei Abdeckungen,
• Figur 2 eine Darstellung einer erfindungsgemässen Anschlussvorrichtung mit bereichsweise freigelegten Kontaktelementen und Messern,
• Figur 3 eine Anschlussvorrichtung im Schnitt,
• Figur 4 eine Anordnung von zwei Kontaktelement-Paaren innerhalb einer erfindungsgemässen Anschlussvorrichtung,
• Figur 5 eine Darstellung, anhand derer die relative Position von Kontaktelement, Kabel und Messer nach der Beschaltung ersichtlich ist,
• Figur 6 durch Stanzen und Prägen hergestelltes Vorprodukte für mit einer Mehrzahl von Kontaktelementen und Messern für eine erfindungsgemässe Anschlussvorrichtung, zusammen mit einem Gehäuse,
• Figur 7 eine Darstellung zweier Anschlussvorrichtungen in einem Montagekanal,
• Figur 8 eine Gehäuse und Abschirmungselement einer Ausführungsform der erfindungsgemässen Anschlussvorrichtung mit Abschirmungen zwischen Kontaktelement-Paaren,
• Figur 9 ein Kontaktelement-Paar für eine Variante einer erfindungsgemässen Anschlussvorrichtung, in welchem eingehende und abgehende Leiter in einem Winkel zueinander stehen,
• Figur 10 einen Stecker für ein Patchkabel zum Anschliessen an eine erfindungsemässe Anschlussvorrichtung,
• Figur 11 einen Steckerkontakt für einen Stecker gemäss Figur 10 in drei verschiedenen Ansichten.

Hereinafter, embodiments of the invention will be described with reference to drawings. In the drawings show:

• FIG. 1 a representation of an inventive connecting device with two covers,
• FIG. 2 a representation of an inventive connecting device with partially exposed contact elements and knives,
• FIG. 3 a connecting device in section,
• FIG. 4 an arrangement of two contact element pairs within a connection device according to the invention,
• FIG. 5 a representation showing the relative position of contact element, cable and knife after the wiring,
• FIG. 6 by punching and embossing produced precursors for having a plurality of contact elements and knives for a connecting device according to the invention, together with a housing,
• FIG. 7 a representation of two connection devices in a mounting channel,
• FIG. 8 a housing and shielding element of an embodiment of the inventive connecting device with shields between contact element pairs,
• FIG. 9 a contact element pair for a variant of a connection device according to the invention, in which incoming and outgoing conductors are at an angle to one another,
• FIG. 10 a plug for a patch cable for connection to a connection device according to the invention,
• FIG. 11 a plug contact for a plug according FIG. 10 in three different views.

The connection device 1 according to FIG. 1 It complies with category 5. It comprises a housing 2 which, in a manner known per se, has a plurality of chambers for contact elements. The chambers extend between insertion slots 2.1, which serve as guides for electrically insulated conductors (not shown) to be contacted. The contact elements are arranged in pairs. In the illustrated embodiment, the contact element pairs 11 are provided with a numbering 2.2. The insertion slots 2.1 are arranged equidistant in the illustrated embodiment, ie, the distances between two insertion slots 2.1 of a pair are equidistant from each other as the distance from an insertion slot to the nearest insertion slot of an adjacent pair. Laterally with respect to the contact elements, the housing has pawls 2.3, which serve for fastening in a mounting channel. In addition to the housing and the contact elements, the connecting device has knives 4, 5. Their function will be explained below. In addition, a labeling cover 6 for second lines (outgoing lines) and a cable cover 7 for first lines (incoming lines) are still visible. The cable cover 7 has a strain relief strap 7.1, to which a multiple cables comprehensive, incoming cable can be mechanically guided and / or fixed.

In FIG. 2 the housing 2 is only partially shown. Therefore, one sees the pairwise juxtaposed contact elements 3 and first knife 4 and second knife 5. Per contact element, a first knife 4 and a second knife 5 is present. The contact elements are substantially flat and define a contact element plane. The blades are preferably arranged parallel to this contact element plane and are electrically insulated from the contact elements. The design and arrangement of the contact elements in contact element pairs 11 is in the FIGS. 3 and 4 especially visible. Each contact element forms a first insulation displacement contact 3.1, a second insulation displacement contact 3.2 and an intermediate transition part 3.3. The insulation displacement contacts 3.1, 3.2 can be formed in a conventional manner and provided for the multiple contacting of insulated conductors of a certain diameter or diameter range. In the illustrated embodiment, the insulation displacement contacts have reinforcements 3.4, which have been taught by embossing and which ensure mechanical stability and sufficient clamping forces even when using very thin sheet metal. The also visible (here as rectangular elements) imprints in the narrowest point of the insulation displacement terminal serve to adjust the width of the contact slot, regardless of the punching tool. In the region of the transition part 3.3, the contact elements have scissors-shaped detent pawls 3.5, which engage after insertion of the contact elements in the chambers of the housing 2 with a locking cam 2.4 of the housing and prevent displacement of the contact elements in the direction of their longitudinal / longitudinal axis. When "shearing" the material is not completely removed unlike punching; here we simultaneously bent the latch. Two pawls 3.5 are drawn per contact element. If the chambers are asymmetrical and shaped so that they form a stop for the locking elements when inserted, also a detent pawl per catch element is sufficient.

The contact elements are asymmetrically shaped in such a way that even with equidistant arrangement of the insulation displacement contacts, the transitional parts 3.3 of the two contact elements of a contact element pair closer to each other than the transition part of a contact element of an adjacent pair. This, in contrast to the known prior art, according to which the contact elements are each symmetrical (the plane of symmetry is in the longitudinal direction, the contact element plane perpendicular plane).

Due to the elements provided by embossing (pawls 3.5, reinforcements 3.4), the first and the second contact element 3 of each pair of contact elements not only differ in their orientation, but differ geometrically. In the illustrated example, the first and second contact elements are mirror images of each other.

When wiring conductors are inserted from the outside into the insertion slots 2.1 of the housing, which in a conventional manner, the insulation locally cut and displaced by the cutting edges of the insulation displacement 3.1, 3.2, so that the insulation displacement contact the conductive interior of the conductors. When wiring at the same time excess lengths of the conductor through the blades 4, 5 are separated. The blades are designed and arranged so that they are not touched by the conductors after the wiring process. Is in FIG. 5 illustrates particularly clearly where a wired conductor 12, a portion of a contact element 3 and a knife 4 are drawn. The knife has in the illustrated embodiment, a recess 4.1, due to which a safety distance between the conductor and the knife is ensured, which also ensures that no electrical contact between the conductor and the knife takes place.

FIG. 6 illustrates how the use of substantially flat contact elements enables a particularly simple production of the device according to the invention. The housing 1 is preferably made as a single injection molded part. For the production of the contact elements 3, the first blade 4 and the second blade 5, a precursor is produced by punching and subsequent embossing from a sheet metal, for example a steel sheet, which has a multiplicity of contact elements / blades, which are provided by webs 13, 14 and 15 are held together. The precursors are optionally cut to a length which corresponds to the length of the connection device and then in the orientation according to FIG. 6 pressed into the designated chambers of the housing. Then the bridges are broken off. By wedging the knives in the plastic housing (by barbs), the knives are held in the housing.

The contact elements have - for example, in contrast to the contact elements according to EP 0 994 528 - No sections which are bent by more than 90 ° relative to the contact element level. Only this circumstance makes it possible that the contact elements (and also the knives) can be produced only by punching and embossing.

FIG. 7 shows two connection devices, in which the covers 6, 7 are mounted, in a mounting channel 21. The pawls 2.3 engage in openings provided for this purpose 21.1 on side walls of the cable channel, whereby the connecting devices are attached.

In FIG. 8 the housing 31 of an alternative embodiment of the inventive connecting device is drawn. This connection device differs from that described above in that a shield is present between the contact element pairs (not shown). This is formed by shielding walls 32. 1, which are present on a shielding element 32. For the shielding walls 31 special insertion slots 31.1 are provided between contact element pairs in the housing. As a result, the Abschrimung can be inserted from the outside into the housing. The shielding walls 32.1 shield contact elements of adjacent pairs, in particular in the region of the insulation displacement contacts, where the contact elements are spatially closer to each other than in the region of the transitional parts. The shielding walls 32.1 are all electrically connected to each other. In addition, the shielding element 32 is grounded as a whole via fork contacts 32.2, which contact side walls of the mounting channel 21 in the installed state of the device.

The embodiment according to FIG. 8 corresponds, for example, to category 6. The contact elements can be identical to those in FIG. 4 be drawn contact elements, wherein the distances between the contact element pairs may be slightly larger than in the embodiment described above. Of course, the use of different kind, asymmetric contact elements is possible. In contrast to the above-described device of category 5 with 10 contact element pairs are in the device of the same width according to FIG. 8 only 8 pairs provided.

In FIG. 9 a pair of contact elements of an embodiment is shown in which the incoming and outgoing conductors are at an angle to each other. Although a machining step is more necessary for the production of these angled contact elements 41 than in the above embodiments and the housing may not be integral, the inventive idea is realized in this embodiment as well. The transitional parts 41.3 of the two contact elements of a pair are here due to the asymmetric configuration (with respect to a plane which connects the insulation displacement contacts together and perpendicular to the flat sections) closer together than the distance to the adjacent contact element of another pair.

FIGS. 10 and 11 show a plug of a connection system which, instead of directly contacting cable wires (corresponding to the conductors) through the insulation displacement terminals, can be used to make contact between a two-wire cable and a pair of contact elements. The plug has a plug housing 51 with at least two plug contacts 52. The plug can, for example, be plugged into the connecting device on the side of the outgoing ladder, wherein the housing has, for example, holding tongues 51.1, which are inserted into the connecting device and guide the plug there and hold. Upon insertion into the terminal device, contact between the plug contacts 52 and the contact elements is established. This one sees particularly clearly in FIG. 11 where, in addition to a plug contact 52 and a portion of a contact element 3 is shown. In FIG. 11 shows drawing A is a side view of a contact element with plug contact. Drawing B is a view of this arrangement obliquely from above, while drawing C shows the arrangement along the line CC (in drawing A) cut in a view from above.

The plug contact has at its end a wire-like portion 52.1, which is used to form the electrical contact between the forks of the IDC 3.2 is performed. The wire-like game is, for example, in cross section round or rectangular. It has, for example, a diameter which corresponds to that of a stripped conductor. It runs between two parallel tongues 52.3 which span one plane. This plane is perpendicular to the contact element level here. At the other end, the plug contact has a cable contacting portion 52.4, which in turn can have at least one cutting terminal 52.5.

Also plugs with more than two plug contacts are conceivable, for example. With four plug contacts.

Claims (18)

1. Connection device for insulated electrical conductors, with a housing (2, 31) and with a plurality of single piece contact elements (3) held by the housing, each of which comprise at least a first insulation displacement contact or piercing contact (3.1) for the contacting of a first conductor, at least a second insulation displacement contact or piercing contact (3.2) for the contacting of a second conductor and a transition section (3.3) extending between the first and the second insulation displacement contact or piercing contact, wherein the contact elements form contact element pairs (11), and wherein the contact elements (3) are asymmetrically shaped in such a manner, that the transition sections (3.3) of the two contact elements of at least one contact element pair (11) at least in certain areas are located closer together than the transition section (3.3) of one of the two contact elements to the transition section (3.3) of a next contact element of an adjacent contact element pair (11), wherein the first and the second insulation displacement or piercing contacts (3.1, 3.2) are arranged in such a manner that the first and the second conductors are guided along different sides of the housing, wherein at least one cutter (4, 5) for cutting off a surplus length of a conductor is assigned to each contact element and a first cutter (4) for cutting off the surplus length of a first conductor and a second cutter (5) for cutting off the surplus length of a second conductor is assigned to each contact element.
2. Connection device in accordance with claim 1, characterised in that the contact elements comprise a plane section and are asymmetrical with respect to that plane, which connects the insulation displacement contacts and/or piercing contacts (3.1, 3.2) and which extends vertically to the plane section.
3. Connection device in accordance with claim 1 or 2, characterised in that by the housing (2) a row of first insertion slots (2.1) and a row of second insertion slots (2.1) are formed, and that the contact elements (3) are arranged in such a manner, that a first insulated conductor can be contacted by a first insulation displacement contact or piercing contact by being inserted into a first insertion slot, and a second insulated conductor can be contacted by a second insulation displacement contact or piercing contact by being inserted into a second insertion slot.
4. Connection device in accordance with one of the preceding claims, characterised in that the cutter assigned to a contact element (4, 5) or at least one of the cutters (4, 5) assigned to the contact element is constructed as a separate component.
5. Connection device in accordance with claim 4, characterised in that the at least one cutter (4, 5) constructed as a separate component is plane and is arranged parallel to a first contact element plane.
6. Connection device in accordance with claim 4 or 5, characterised in that the housing (2) and the cutter (4, 5) constructed as a separate component are shaped and mutually arranged in such a manner, that a contacted conductor does not contact the cutter after the cutting off of the surplus length.
7. Connection device in accordance with one of the preceding claims, characterised by a covering (6, 7) for covering the contacts following the wiring operation.
8. Connection device in accordance with claim 7, characterised in that the covering (7) or at least one covering comprises a fixing element (7.1) for the attachment of a cable as a tension relief device.
9. Connection device in accordance with one of the preceding claims, characterised in that the contact elements (3) comprise latching catches (3.5) for the prevention of longitudinal movements of the contact element (3) arranged in the housing (2).
10. Connection device in accordance with one of the preceding claims, characterised in that the first and the second insulation displacement contact or piercing contacts (3.1, 3.2) are arranged in such a manner, that the first and the second conductors are guided on opposite sides of the housing.
11. Connection device in accordance with claim 10, characterised in that the contact elements constructed as a plane and are located in a common plane.
12. Connection device in accordance with claim 10 or 11, characterised in that the contact elements (3) are flat except for possible elements produced by embossing and/or shearing of a punched out metal sheet.
13. Connection device in accordance with one of the preceding claims, characterised by electrically conductive screening walls (32.1) arranged between the contact element pairs.
14. Connection device in accordance with claim 13, characterised in that the housing (31) comprises insertion slots (31.1), into which screening walls (31.1) can be inserted from the outside.
15. Connection device in accordance with claim 13 or 14, characterised in that the screening walls (32.1) are formed on a single screening element (32), and that the screening element (32) in preference comprises contact means (32.2) for earthing the screening walls (32.1).
16. Connection device in accordance with one of the preceding claims, characterised in that the housing (2, 31) is of one piece.
17. Connection system compromising a connection device in accordance with one of the preceding claims, wherein at least the second contact (3.2) of every contact element (3) is an insulation displacement contact, as well as a plug for the connection of a cable containing at least two conductors, characterised in that the plug comprises plug contacts (52), which can be directly contacted by the second contacts (3.2).
18. Connection system in accordance with claim 17, characterised in that the plug contacts comprise a section with a wire-like shape (52.1) for the insertion between cutters of the second contact (3.2).

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