EP1124285B1 - Appliance plug socket - Google Patents

Abstract

The socket has a base body forming an electrically insulating contact bearer and conducting contact elements with a first contact end for a cable wire end and a second contact end for a counter contact element of an electrical unit. Each contact element is a flat strip and forms a combination contact element. Its first contact end has a blade contact with a wire insert slot and a clamp contact for a cable wire end that are optionally usable. The socket has a base body (1) forming a contact bearer of electrically insulating material and at least two electrically conducting contact elements (2) fixed in the base body with a first contact end (2a) for connection to a cable wire end (3) and a second contact end (2b) for plug contact with a counter contact element (4) of an electrical unit (5). Each contact element is a flat strip and forms a combination contact element. Its first contact end has a blade contact with a wire insert slot and a clamp contact for a cable wire end that are optionally usable.

Description

The invention relates to a device socket for the production an electrically conductive connection between Electric components, according to the preamble of the claim 1.

In known from practice embodiments may Device sockets can be very varied, with their contact elements on the one hand firmly with electrical Lead wires are connected and on the other hand electrically conductive with suitable connectors or Appliance connectors are releasably plugged together. The electric conductive contact elements of these known designs are generally in a kind of contact carrier made of electrically insulating material, (See, for example, DE9205977U). Disadvantages of many known embodiments are seen to be relatively proportionate are cumbersome and relatively close to others adapted electrical components and firmly mounted with it are.

The invention is based on the object, a device socket presupposed in the preamble of claim 1 To create kind of, which is characterized mainly by a relatively simple and robust construction, through its versatile, variable adaptability to other electrical Components as well as by their relatively easy mounting and demountability and thus by a easy interchangeability distinguishes.

This object is achieved by the indicator of claim 1, wherein advantageous embodiments and further developments of this invention in the Subclaims are given.

An essential starting point of the present invention is seen in that each contact element for example in the form of a flat sheet metal strip as well as in shape a combination contact element is designed in the manner that its first terminal contact end on the one hand a provided with a cable wire slot Cutting contact and on the other hand one for clamping a cable wire end associated contact device has, wherein cutting contact and contact device optionally usable. The device socket thus executed represents an extremely good condition for this that it is very versatile in a simple way and easily interchangeable with the corresponding ones Provided contact elements and other electrical Components can be assembled.

According to an advantageous embodiment of the invention is the or each contact element in a continuous, fitting receiving slot inserted into the body and by an outwardly projecting, bent Fixation lugs axially immovable in the body established. The device socket according to the invention can in this way relatively easy and fast with the for the number of contact elements necessary for the particular application (e.g., two, three or four contact elements) be fitted. In any case, however, is for it ensured that each contact element axially immovable is fixed in the body, so that when manufactured of detachable plug connection, the contact elements be held immovably in the body.

As explained in detail with reference to the drawing can be brought up cable wire ends of electrical cables very simple, reliable and at the same time always interchangeable conductive with the corresponding terminal contact ends the associated contact elements connected become. This can be done either by the Cutting contact or by the terminal contact device happen every contact element. In this case, this terminal contact device essentially constructed so that in Basic body one each approximately parallel to a contact element extending, outward and contact element open cable wire receiving groove is provided and that she recorded a in this body, from accessible from the outside and in the area of the cable wire receiving groove against a side surface of the contact element having screwable screw terminal.

The also on the same terminal contact end of each contact element provided cutting contact is easy Way designed so that the cutting edges provided cable wire slot in the longitudinal direction of the contact element extends to the free end of the first Schneidkontaktendes opens out open and a the cable wire end has such adapted slot width, that during the longitudinal insertion of an associated cable wire end by cutting a cable insulation sleeve an electrically conductive connection with made the contact element while doing this cable wire end can be clamped.

A particularly advantageous development of this invention results from the fact that the first terminal contact end each contact element designed as an insulating part Cable wire-down device is assigned, the a receiving slot for the protruding from the body (outstanding) free end of the first Anschlusskontaktendes and a transverse thereto, continuous cable wire insertion opening for receiving the associated, provided with the insulating jacket Has cable wire end. This cable wire hold-down thus additionally ensures a secure determination the corresponding cable wire end in the slot of the cutting contact. In addition, you can all identically trained hold-downs as well at the same time, as it were, as connecting elements to further with the first terminal contact ends of Contact elements connectable electrical components be consulted, as later with reference to some Examples or the drawing can be seen.

The device socket according to the invention also has all through their relatively simple design and their versatile and variable design and customization options in a very advantageous manner the requirements for a standard-compliant design. In this Trap is characterized mainly by a standard-compliant Arrangement and distribution of the contact elements, by standard design and main dimensions as well by a standard dust and moisture protected Execution.

Fig.1

eine Vertikalschnittansicht durch ein erstes Ausführungsbeispiel der erfindungsgemäßen Gerätesteckdose, bei Benutzung eines Schneidkontaktes;

Fig.2

eine im wesentlichen gleichartige Vertikalschnittansicht wie Fig.1 lediglich im Bereich eines Kontaktelementes, bei Benutzung einer Klemmkontakteinrichtung;

Fig.3

eine Perspektivansicht der Gerätesteckdose mit zugeordneten Kabeldraht-Niederhaltern vor dem Zusammenbau;

Fig.4

eine ähnliche Perspektivansicht wie Fig.3, bei montierten Kabeldraht-Niederhaltern;

Fig.5

eine vertikal geschnittene Perspektivansicht eines anderen Ausführungsbeispieles der Erfindung, im auseinandergezogenen Zustand von Gehäuseoberteil und Gehäuseunterteil;

Fig.6

eine ähnliche Perspektivansicht wie Fig.5, jedoch im zusammengebauten Zustand von Gehäuseoberteil und Gehäuseunterteil.

The invention will be explained in more detail with reference to some embodiments illustrated in the drawings. In this drawing show

Fig.1

a vertical sectional view through a first embodiment of the device socket according to the invention, when using a cutting contact;

Fig.2

a substantially similar vertical sectional view as Figure 1 only in the region of a contact element, when using a terminal contact device;

Figure 3

a perspective view of the device socket with associated cable wire-downholders before assembly;

Figure 4

a similar perspective view as Figure 3, with mounted cable wire holddowns;

Figure 5

a vertically sectioned perspective view of another embodiment of the invention, in the exploded state of the upper housing part and lower housing part;

Figure 6

a similar perspective view as Figure 5, but in the assembled state of the upper housing part and lower housing part.

The device socket according to the invention is - as per se known - for producing an electrically conductive Connection between corresponding electrical components built up. This device socket is first based on Figures 1 and 2 explained in their basic structure.

According to Figures 1 and 2, the inventive Appliance socket one externally substantially approximately cubic or cuboidal housing-like body 1, the type of contact carrier or contact element carrier forms for several electrically conductive contact elements 2 and a substantially electrically insulating Material is made, for example, from a preferably polyamide reinforced with glass fibers (e.g., 30%) (e.g., PA6). Depending on the intended use of this device socket are in the body 1 usually at least two, but at most four contact elements 2 in a suitable Way set; in Fig.1 are two such Contact elements 2 approximately at right angles to each other around their Longitudinal axis rotated to the main body 1 shown.

These contact elements 2 are opposite to each other at their Ends formed as terminal contact ends 2a, 2b. In each case, the one, first terminal contact end 2a, ie in the figures 1 and 2 respectively the upper terminal contact end 2a, with a cable wire end 3 connectable while that in the figures 1 and 2, respectively lower, second terminal contact end 2b with a in Fig.1 only dash-dotted lines indicated counter contact element 4 a also indicated only by dash-dotted lines, suitably designed electrical components 5 can be plugged together. Each contact element 2 expediently at its - in the figures 1 and 2 - lower second contact end 2b one to the free End open, about fork-shaped terminal receiving opening 2b 'for receiving the aforementioned male contact element 4 of the other electrical component 5.

As a comparison representations in the figures 1 and 2 clearly indicates is each contact element 2 of this device socket according to the invention approximately in the form a flat sheet metal strip and in the form of a combination contact element executed in such a way that its first Anschlusskontaktende 2a on the one hand with a Cable wire slot 6 provided cutting contact 7 and on the other hand one for clamping the cable wire end 3 has associated clamping contact device 8, wherein cutting contact 7 and clamping contact device 8 can be optionally used as below explained in more detail with reference to Figures 1 and 2 becomes.

It should be mentioned in advance that each contact element 2 in is essentially similar and formed in one matching, continuous receiving slot 9 in the Base body 1 inserted and inserted in his Position by an outwardly projecting, bent Fixing tabs 9a axially immovable in the base body. 1 is fixed (in this regard, in anticipation of the explanations to the figures 3 and 4 already mentioned that there the in a matching recess of the body 1 inflected Fixation flap 9a to recognize particularly clearly are).

On the basis of Fig.2 is first explained how the terminal contact device 8 for the upper terminal contact end 2a of the or each contact element 2 is formed substantially be and can be used. This is in the body 1 each one approximately parallel to the / each contact element 2 extending, outward and contact element 2 out open cable wire-receiving groove 10 is provided. The or each terminal contact device 8 has a recorded in the base body 1, from the outside accessible and in the area of the cable wire receiving groove 10 against a side surface 2 c of the contact element. 2 screwable screw on, which is essentially a Clamping screw 11 with externally accessible screw head 11a, a rotationally held in the base body 1 Nut (e.g., square nut) 12 and a Spring plate 13 contains, against the clamping screw 11th pushes, whereby the in the cable wire receiving groove 10th plugged in, stripped cable wire end 3 against the Side surface 2c of the contact element 2 clamped is, so that an electrically conductive contact with it is made.

The vertical sectional view in Fig.1 shows the two rotated approximately at right angles to each other in the base body. 1 recorded contact elements 2 simultaneously in two different views. Although in Fig.1 only next to the right contact element 2, the previously described terminal contact device 8 - without jammed cable wire end - can be seen, of course, both or all upper, first terminal contact ends 2a in the same way a terminal contact 8 assigned. At the same time, however - as already mentioned set forth above - each contact element 2 at its upper, first terminal contact end 2a and the cutting contact 7 on. It runs with opposite each other Cutting edge 6a provided cable wire slot 6 in the longitudinal direction of the or each contact element 2. It is also provided that this Cable wire slot 6 to the (upper) free end This first terminal contact end 2a opens out open (as with the left contact element 2 in Fig.1 can be seen) and that the cable wire end 3 so adapted slot width SW has that at Longitudinal insertion (in Figure 1 from above) of the associated Cable wire end 3 in the contact area of this insertion slot 6 and the cutting edges 6a of the cable insulation wire 3a intersected and thereby a electrically conductive connection with the contact element. 2 is produced, wherein at the same time - as also on left contact element 2 can be seen in Figure 1 - this partially stripped cable wire end 3 in the slot 6 is clamped.

Although in the use of the cutting contact 7, the cable wire ends 3 already relatively reliable in Cable wire slot 6 of each corresponding Contact element 2 can be clamped, it is for considered particularly meaningful if the - in the drawing each upper - first terminal contact end 2a each Contact element 2 designed as an insulating part Cable wire-down device 14 is assigned. Each cable wire hold-down 14 has a receiving slot 15 for the from the body 1 sufficiently far above projecting free end portion of the associated first terminal contact end 2a and a transverse thereto extending, continuous cable wire plug-in or Through opening 16 for receiving the associated, with the insulating sheath 3a provided cable wire end 3, as it is in connection with the right contact element 2 is illustrated in more detail in FIG. Each of these similarly trained cable wire hold-down 14th also has a cable wire through opening 16 and the receiving slot 15 containing slip cap 17th to attach to the upwardly protruding free End portion of the associated first terminal contact end 2a on. Further, each hold-down 14 has a from his slip cap 17 downwardly projecting Snap hook 18, which fits into a body 1 incorporated Einhaknut 19 engages and therein, as illustrated in particular in FIG. 4, fixed in the mounted position of the blank holder 14 is.

Each cable wire hold-down 14 holds in the assembled state as is illustrated in particular in FIG. the respectively associated cable wire end 3 extremely reliable in slide-in slot 6. This is further supported by that the main body 1 in the area below the Aufsteckkappe 17 a in the cable wire insertion opening 16 protruding, the corresponding cable wire end 3 particularly fixing projection 20, which is particularly evident in Fig.1 clearly expressed comes.

By using this cable wire hold-down 14 for fixing the cable wire ends in the cutting contacts 7 of the respective associated contact element 2 can but also the insertion and clamping of each cable wire end 3 in the slot 6 of each cutting contact 7 be relieved. For this purpose, first with the Insulating jacket 3a providing cable wire end 3 - about as shown in Figure 1 - far enough in the insertion opening 16 of the hold-down Aufsteckkappe 17 pushed in. The hold-down 14 is then with the cable wire end 3 - according to Figure 1 - from above the free end portion of the associated terminal contact end 2a attached and on this Anschlußkontaktende 2a pushed so far down that as mentioned above - the insulating jacket 3a of the Cutting edges 6a of the insertion slot 6, thereby an electrically conductive contact to the contact element 2 manufactured while the cable wire end 3 is clamped. In this assembly or mounting state is every cable wire-down device 14 with the help of its snap hook 18 reliably on or fixed in the base body 1, but at any time if necessary, easily detachable and removable is to make any changes to the make electrical connections or connections to be able to.

To the previously explained mounting the cable wire hold-down 14 or at all the handling of this Hold-down 14 especially with relatively small dimensions Each hold-down 14 can be made easier as in the manner illustrated in Fig.3 with a Holding or mounting lug 14a in one piece with the To be made cap 17 that this mounting lug 14a after mounting the hold-down 14 the associated terminal contact end 2a and the main body 1 easily removed, for example, canceled can be.

As in particular at the left contact element 2 in Fig.1, but also for example in Fig.3 to recognize is, has the upwardly projecting first terminal contact end 2a of each contact element 2 one beside the cable wire end 3 in the receiving slot 15 of the hold-down 14 or the hold-down cap 17 protruding, freely outwardly elongated, tongue-shaped Contact approach 2d on. This is the aforementioned receiving slot 15 in the plan area of the contact projection 2d by a cross-section approximately cross-shaped Passage opening 21 extends outwardly into the on the one hand, the tongue-shaped contact projection 2d protrudes (see Figures 1 and 4) and on the other hand from the outside a kind of fork contact, such as the fork contact 22 in Figures 5 and 6) of another electrical components can be inserted so that this Fork contact 22 on the one hand in the hold-down 14th is determinable and, secondly, by making a electrically conductive connection astride the contact approach 2d of the first terminal contact end 2a overlaps or about astride this contact approach 2d can be plugged. To this plugging a fork contact 22, or the like, it is expedient if the tongue-shaped contact projection 2d For example, in the manner illustrated in Figure 3 one upwards or outwardly approximately cut-shaped has tapering free end edge 2d '.

As mentioned before, can help with one from above on the contact lug 2d each first terminal contact end 2a or each associated Contact element 2 plugged fork contact 22 a electrically conductive connection to another electrical component getting produced. In this further Electric component may be according to the in Figures 5 and 6 illustrate another embodiment the invention, especially an advantageous embodiment or development of the first embodiment represents, for example, a suitably trained PCB 23 act. This electrical circuit board 23 is accordingly at the first terminal contact ends 2a containing upper end side 1a of the main body 1 is arranged. This circuit board 23 has several in number and distribution of the contact elements 2 in the main body 1 corresponding to the associated Contact lugs 2d push-on fork contacts 22 on. It is also considered appropriate if the main body 1 with all recorded therein and fixed elements, in particular the contact elements 2 and the downers 14 and optionally the cable wire ends 3, in a housing lower part 24 is recorded. Furthermore, it is expedient when the upwardly projecting first terminal contact ends 2a of all contact elements 2 and the plugged on it Cable wire hold-down 14 from the base body 1 in an upper free housing space 24a of the housing lower part Protrude 24; it is also at least at a side or side wall 24b of this lower housing part 24 is a jack-like cable gland 25 for a provided electrical connection cable. Furthermore is Here, the circuit board 23 in the base body. 1 facing bottom 26a of an approximately lid-shaped Housing upper part 26 set, with its lower Edge 26b fitting on the upwardly facing edge 24c the lower housing part 24 is fixed. To a high Tightness between the lower housing part 24 and the upper housing part 26 to achieve, for example, to fulfillment a standard gasket according to IP67 according to EN60529, is between the lower edge 26b of the upper housing part 26 and the upper edge 24 c of the lower housing part 24th a corresponding profile seal 27 is arranged, i. is appropriate - as shown in Figures 5 and 6 - This profile seal 27 in the lower edge 26 a of the upper housing part 26 (in a corresponding groove) used.

Lower housing part 24 and upper housing part 26 are expedient made of a suitable insulating plastic, wherein the lid-shaped housing upper part 26 can be made of a transparent plastic, by e.g. a light-emitting diode mounted on the printed circuit board 23 to show through. The circuit board 23 itself, circuits can e.g. for a light emitting diode, Protective circuits and the like. It can in this way a total of a modular wiring system be created.

What the structural design of the in Figures 5 As far as FIG. 6 and FIG. 6 are concerned, It is also considered useful if, for example centrally and essentially vertically extending in the lower housing part 24 and in the upper housing part 26 - as in of the drawing (e.g., Figures 5 and 6) - for example tubular and slotted formed, nestable and snap-lockable with each other fixing organs 28, 29 are attached. On the outer circumference side of the housing upper part 26 arranged fixing 29, i. in a kind there incorporated annular groove 29a is additionally the circuit board 23 via a corresponding Receiving bore 23a exchangeably engaged, and while this circuit board 23 also still at its outer edge (outer peripheral edge) in edge regions 26c of the upper housing part 26 releasably fixed. If necessary Thus, a built-in circuit board 23rd replaced with a differently populated printed circuit board become.

In Fig.6 is also seen that in the tubular Fixing members 28, 29 of both housing parts 24, 26 in addition a locking screw 30 is received, from the upper housing part 26 ago by both housing parts 26, 24 is inserted through and for fixing this by the fixing members 28, 29 in a sense as a device socket unit prefixed housing parts 24, 26 at another electrical component is determined.

The described device socket according to the invention provides with a relatively simple construction almost ideal structural Requirements for a standardized arrangement and Distribution of contact elements, a standardized design at least in relation to their main dimensions as well a likewise standard-compliant dust and moisture protected Execution. With regard to the overall standard Execution is for example also the German one Industry standard according to DIN 43650 or the corresponding ISO standard pointed, through which approximately the arrangement picture the contacts or contact elements and the corresponding Types is determined. After the already mentioned EN60529 specifies the type of protection i.e. to what extent a device socket safe to touch or protected against dust and moisture / water have to be. These standards can with the invention executed device socket can be easily met.

Claims (18)

1. Appliance socket for establishing an electrically conducting connection between electrical components, containing

   a)a base body (1) which forms a kind of contact carrier and is made of an electrically insulating material,

   b)at least two electrically conducting contact elements (2) which are fixed in the base body (1) and are formed at their mutually opposite ends as connection contact ends (2a, 2b), wherein the one, first connection contact end (2a) can be connected to a cable wire end (3) and the second connection contact end (2b) can be fitted together with a mating contact element (4) of an electrical component (5),
   characterised in that

   c) each contact element (2) is approximately in the form of a flat sheet-metal strip as well as in the form of a combined contact element such that its first connection contact end (2a) comprises on one side an insulation displacement contact (7), which is provided with a cable wire insertion slot (6), and on the other side a clip contact device (8), which is assigned to clamp a cable wire end (3), wherein the insulation displacement contact (7) and the clip contact device (8) can be optionally used.
2. Appliance socket according to Claim 1, characterised in that each contact element (2) is inserted in the base body (1) in a matching, continuous locating slot (9) and secured by an outward projecting, bent-over fixing tab (9a) so as to be axially immobile in the base body (1).
3. Appliance socket according to Claim 1, characterised in that each contact element (2) comprises at its second connection contact end (2b) an approximately fork-shaped clamping locating opening (2b'), which is open towards the free end, for accommodating a plug-shaped mating contact element (4) of another electrical component (5).
4. Appliance socket according to Claim 1, characterised in that a respective cable wire locating groove (10), which extends approximately parallel to a contact element (2) and is open outwards and towards the contact element, is provided in the base body (1), and the clip contact device (8) comprises a screw-type terminal (11, 12, 13) which is accommodated in the base body (1), is accessible from outside and can be screwed in the region of the cable wire locating groove (10) against a side face (2c) of the contact element (2).
5. Appliance socket according to Claim 1 and/or 4, characterised in that the cable wire insertion slot (6), which is provided with cutting edges (6a), extends in the longitudinal direction of the contact element (2), opens out towards the free end of the first connection contact end (2a) and has a slot width (SW) adapted to the cable wire end (3) such that, when the cable wire end is inserted in the longitudinal direction, while cutting into a cable wire insulating sheath (3a), an electrically conducting connection with the contact element is established and this cable wire end (3) can at the same time be clamped.
6. Appliance socket according to Claim 5, characterised in that a cable wire hold-down device (14), which is formed as an insulating part, is associated with the first connection contact end (2a), which device comprises a locating slot (15) for the free end portion, protruding from the base body (1), of the first connection contact end (2a) as well as a continuous cable wire push-through opening (16), extending transversely thereto, for accommodating the associated cable wire end (3) provided with the insulating sheath (3a).
7. Appliance socket according to Claim 6, characterised in that each of the cable wire hold-down devices (14), which are formed substantially in the same way, comprises a push-on cap (17), which contains the cable wire push-through opening (16) and the locating slot (15), for pushing onto the protruding free end portion of the associated first connection contact end (2a) as well as a snap-action hook (18) which engages in a hook-in groove (19) of the base body (1) and can be fixed therein.
8. Appliance socket according to Claim 7, characterised in that the push-on cap (17) of the hold-down device (14) is made with a break-off mounting lug (14a).
9. Appliance socket according to Claim 7, characterised in that, in the region below the push-on cap (17), the base body (1) comprises a projection (20) which protrudes into the cable wire push-through opening (16) and fixes the corresponding cable wire end (3).
10. Appliance socket according to Claim 6 or 7, characterised in that the first connection contact end (2a) of each contact element (2) comprises a tongue-shaped contact extension (2d) which projects next to the cable wire end (3) into the locating slot (15) of the hold-down device (14) and is freely lengthened outwards, and this locating slot (15) is lengthened outwards in the horizontal projection region of the contact extension (2d) by a through-opening (21) which has an approximately cross-slot-shaped cross section and into which the tongue-shaped contact extension (2d) projects on one side and a bifurcated contact (22) of another electrical component can be pushed from outside on the other such that this bifurcated contact (22) can on the one hand be secured in the hold-down device (14) and on the other engages approximately astraddle over the contact extension (2d) of the first connection contact end (2a) while establishing an electrically conducting connection.
11. Appliance socket according to Claim 10, characterised in that the tongue-shaped contact extension (2d) has a free end edge (2d') which tapers outwards approximately in the shape of a cutting edge.
12. Appliance socket according to Claim 10, characterised in that a printed circuit board (23) is disposed at the end side (1a) of the base body (1) which contains the first connection contact ends (2a), which board comprises a plurality of bifurcated contacts (22) which correspond in number and distribution to the contact elements (2) in the base body (1) and can be pushed onto the associated contact extensions (2d).
13. Appliance socket according to Claim 12, characterised in that the base body (1) with all the elements accommodated and secured therein is accommodated in a housing lower part (24), wherein the first connection contact ends (2a) of all contact elements (2) as well as cable wire hold-down devices (14) pushed onto the latter project from the base body (1) into an upper free housing space (24a), and wherein a bushing-like cable gland (25) for an electrical connection cable is provided at least at one side (24b) of this housing lower part (24), and that the printed circuit board (23) is secured in the underside (26a), facing the base body (1), of an approximately lid-shaped housing upper part (26) which is fixed with its lower edge (26b) in a well-fitting manner on the upward pointing edge (24c) of the housing lower part (24).
14. Appliance socket according to Claim 13, characterised in that a profiled seal (27) is disposed between the lower edge (26a) of the housing upper part (26) and the upper edge (24c) of the housing lower part (24).
15. Appliance socket according to Claim 13, characterised in that fixing members (28, 29), which are approximately tubular and slotted and can be fitted into one another and locked together with a snap action, are disposed approximately centrally and so as to extend substantially vertically in the housing lower part (24) and in the housing upper part (26).
16. Appliance socket according to Claim 15, characterised in that the printed circuit board (23) is additionally locked in place in a replaceable manner by way of a corresponding locating bore (23a) at the outer circumferential side of the fixing member (29) disposed in the housing upper part (26), wherein this printed circuit board (23) is also detachably secured at its outer edge in the edge regions (26c) of the housing upper part (26).
17. Appliance socket according to Claim 15, characterised in that a locking screw (30) for fastening this assembled appliance socket to another electrical component is additionally accommodated in the tubular fixing members (28, 29) of both housing parts (24, 26).
18. Appliance socket according to at least one of Claims 1 to 17, characterised by a standardized arrangement and distribution of the contact elements (2), by a standardized design and standardized principal dimensions as well as by a standardized dust- and moisture-proof construction.

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