EP1478058A1 - Electrical connector with shorting contact - Google Patents

Abstract

A receptacle (15) for a short-circuit bridge (8) is provided in a holding piece (7). The receptacle has a rounded portion (18) connecting two support surfaces. The short-circuit bridge is support sections which adjoin two contact arms (26) which are angled.

Description

The invention relates to an electrical line connector with a short circuit bridge.

Electrical line connectors are used, for example, in large numbers in motor vehicles used. For cable connectors that are related to components of the motor vehicle are used where there is a risk that false triggering or damage due to static electricity can if the connector elements of the line connector are separated are, the component-side connector element with at least provided a short-circuit bridge, with each of which at least two contact elements be electrically short-circuited. So that are also connected Circuits shorted.

Such an electrical line connector with a short circuit bridge is, for example described in DE 199 47 029 A1. This includes a first and a second Connector element. The first connector element has several first contact elements, each in a receiving space of the housing of the first connector element added and electrically with a cable are connected. It also has a cavity in which there is a projection located. In this cavity there is a short circuit bridge by means of the projection and fixed with noses. The short circuit bridge is made of an electrical conductive material. It has a flat support section, the has the lugs for fixing and is supported on an outer wall of the hollow chamber. A resilient section extends bent from the support section and at a distance from the support section is bent back by approximately 180 ° and back extends to and beyond the support section. The bent back section forms two resilient contact arms, which are each intended to be resilient to make electrical contact with a first contact element when the first Connector element not with a second connector element of the Line connector is connected. The second connector element has one or several release tabs as venting elements that are used when connecting of the two connector elements and thus the associated second Contact elements with the first contact elements of the first connector element the contact arms of the short circuit bridge from the first contact elements withdraw.

The short-circuit bridge in the cavity is supported on the one hand by the Support section and on the other hand at a distance from it by contacting the resilient section in the area in which it is bent back against the partition between the receiving chamber and the hollow chamber receiving the short-circuit bridge. This requires a relatively long and therefore not very stiff training on the one hand, the space required to accommodate the short-circuit bridge large and on the other hand the contact pressure of the contact arms is reduced.

The invention has for its object to an electrical line connector create one of the associated connector elements with a short circuit bridge is provided, the holding arrangement for the shorting bridge in the connector element and the formation of the short-circuit bridge so on each other are agreed that short contact arms can be realized and secure support is achieved with high contact forces.

• ein erstes Steckverbindungselement,
  • dem mindestens zwei erste Kontaktelemente zugeordnet sind, die jeweils zum elektrisch leitenden Anschließen eines Kabels oder einer Leiterplatte dienen,
• das mindestens eine Aufnahme bildet, welche eine ebene erste Stützfläche und eine dazu parallele zweite Stützfläche aufweist, wobei mindestens die erste Stützfläche teilweise von einem Rand umschlossen ist, der zwei parallele Seitenflächen aufweist, und
• dem mindestens eine Kurzschlussbrücke zugeordnet ist,
  • welche aus einem elektrisch leitenden blechförmigen Material hergestellt ist und einen ebenen ersten Stützabschnitt und einen dazu mit Abstand gegenüberliegenden zweiten Stützabschnitt aufweist, der mit dem ersten Stützabschnitt einstückig verbunden ist, wobei beide Stützabschnitte zueinander federnd ausgebildet sind und mit Vorspannung an der zugehörigen Stützfläche der zugehörigen Aufnahme anliegen und wobei der erste Stützabschnitt zwei entgegengesetzte Seitenkanten aufweist, die zwischen den Seitenflächen der Aufnahme gehalten sind und
  • welche mindestens zwei mit dem zweiten Stützabschnitt einstückig verbundene federnde Kontaktarme aufweist, und
• ein zweites Steckverbindungselement,
  • dem eine der Anzahl der ersten Kontaktelemente entsprechende Anzahl von zweiten Kontaktelementen zugeordnet ist, die zu den ersten Kontaktelementen passend ausgebildet sind und jeweils zum elektrisch leitenden Anschließen eines Kabels oder einer Leiterplatte dienen, und dem
  • ein Lüftelement zugeordnet ist
  • wobei im unverbundenen Zustand der beiden Steckverbindungselemente die Kontaktarme federnd in Kontakt zu den ersten Kontaktelementen stehen und im verbundenen Zustand derselben diese durch das Lüftelement außer Kontakt zu den ersten Kontaktelementen gehalten werden und wobei der erste Stützabschnitt mit Eingriffsabschnitten versehen ist, die in eine der die Aufnahme begrenzenden Flächen eingreifen.

This task is solved by an electrical line connector, comprising

• a first connector element,
  • which are assigned at least two first contact elements, each of which is used for the electrically conductive connection of a cable or a printed circuit board,
• which forms at least one receptacle which has a flat first support surface and a second support surface parallel to it, at least the first support surface being partially enclosed by an edge which has two parallel side surfaces, and
• which is assigned at least one short circuit bridge,
  • which is made of an electrically conductive sheet-like material and has a flat first support section and a second opposite support section at a distance from it, which is connected in one piece to the first support section, both support sections being resilient to one another and with prestress on the associated support surface of the associated receptacle abut and wherein the first support portion has two opposite side edges, which are held between the side surfaces of the receptacle and
  • which has at least two resilient contact arms connected in one piece to the second support section, and
• a second connector element,
  • the number of second contact elements corresponding to the number of the first contact elements is assigned, which are designed to match the first contact elements and each serve for the electrically conductive connection of a cable or a printed circuit board, and the
  • a ventilation element is assigned
  • wherein in the unconnected state of the two connector elements, the contact arms are resiliently in contact with the first contact elements and in the connected state of the latter they are kept out of contact with the first contact elements by the venting element, and wherein the first support section is provided with engagement sections which engage in one of the receptacles interfering surfaces.

The advantage of this design is that the two-sided edging of the retaining web A favorable support is achieved in the area of the receptacle, so that short contact arms can be realized, which have a high rigidity. The enclosure in the area of the receptacle by the two support sections the short-circuit bridge is particularly favorable because the two support sections in the Area of the recording lie flat on the support surfaces and to these with a large bias can be brought in so that the means required are to the short circuit bridge against the deferment direction on the To secure admission, have no particularly large forces to absorb. It is this makes it possible to assign the engagement sections only to the first support section, the advantage is that when the contact arms are released, none of the holder negative forces act on the engagement sections.

The short-circuit bridge can be made of stainless steel, for example spring steel can be produced so that the contact pressure also lasts over a long service life is guaranteed.

Due to the possibility of making the contact arms short, they are corresponding stiff so that high contact forces are achieved with the first contact elements are given a high contact force even under unfavorable conditions that maintains a secure electrical connection.

The short-circuit bridge is also countered by the side surfaces Rotation in its seat secured in the receptacle. If more than two first contact elements A short-circuit bridge can also be short-circuited be provided, which has a corresponding number of contact arms.

For a first embodiment of the line connector according to the invention, that at least on the side edges of the first support section a projection is formed as an engaging portion, which in the push-on direction has a flat flank and a steep flank opposite to the direction of postponement. there it is beneficial if the steep flank is perpendicular to the direction of the slide open, so the resistance to being pushed out of the receptacle accordingly is high.

In a configuration of the line connector according to the invention is for a second embodiment provided that on the two side edges of the first support section each formed at least one triangular projection as an engagement section which engages with the projecting tip in the first support surface.

Another embodiment variant of the line connector according to the invention provides that at least one projection on the first support section serves as an engagement section is formed by punching and turning, in the direction of the second Protruding section protrudes and engages in the first support surface.

For a fourth embodiment of the line connector according to the invention, that the first support section runs parallel to the sliding direction has slit-shaped cutout, the opposite boundary edges with protrusions protruding towards each other as engaging portions are provided, and that the first support surface is divided by a web which in Cutout lies and in the corresponding side surfaces of the engagement sections intervention.

In a fifth embodiment of the line connector according to the invention further provided that the first support section one as a base section and one designed as a tongue section, the opposite side edges of each are provided with at least one projection as the engagement section, and that the first support surface has a first support surface section adapted to the base section and comprises a second support surface section adapted to the tongue, the tongue with its engaging portions in the side surfaces of the rim, the limited to engage the second support surface section.

In all embodiments it is provided that a transition between the first Support surface and the second support surface is provided in the form of a curve and that the first support section and the second support section of the short circuit bridge are connected by an arc section adapted to the course of the curve.

Preferred embodiments of the invention are schematic in the drawing shown and explained in more detail using the same.

Figur 1

schematisch einen Längsschnitt durch einen Leitungsverbinder mit einem ersten und zweiten Steckverbindungselement vor dem Verbinden derselben;

Figur 2

eine erste Ausgestaltungsvariante der Kurzschlussbrücke und der zugehörigen Aufnahme im Haltesteg vor dem Verbinden der beiden;

Figur 3

Kurzschlussbrücke und Aufnahme von Figur 2 im verbundenen Zustand;

Figur 4

eine weitere Ausführungsform der Kurzschlussbrücke und der Aufnahme vor dem Verbinden der beiden und

Figur 5

die in Figur 4 dargestellte Kurzschlussbrücke im verbundenen Zustand mit der Aufnahme;

Figur 6

eine dritte Ausführungsform der Kurzschlussbrücke und der Aufnahme des Haltesteges vor dem Verbinden der beiden und

Figur 7

die Kurzschlussbrücke gemäß Figur 6 im verbundenen Zustand mit der Aufnahme;

Figur 8

eine vierte Ausführungsform einer Kurzschlussbrücke und Aufnahme des Haltesteges für diese vor dem Verbinden;

Figur 9

die Kurzschlussbrücke gemäß Figur 8 im verbundenen Zustand mit der zugehörigen Aufnahme des Haltesteges;

Figur 10

eine fünfte Ausführungsform einer Kurzschlussbrücke und einer zugehörigen Aufnahme des Haltesteges vor dem Verbinden und

Figur 11

die Kurzschlussbrücke gemäß Figur 10 im verbundenen Zustand mit der zugehörigen Aufnahme.

It shows

Figure 1

schematically shows a longitudinal section through a line connector with a first and second connector element before connecting them;

Figure 2

a first embodiment of the short-circuit bridge and the associated receptacle in the holding bridge before connecting the two;

Figure 3

Short-circuit bridge and recording of Figure 2 in the connected state;

Figure 4

a further embodiment of the shorting bar and the receptacle before connecting the two and

Figure 5

the short-circuit bridge shown in Figure 4 in the connected state with the receptacle;

Figure 6

a third embodiment of the short-circuit bridge and the inclusion of the holding bridge before connecting the two and

Figure 7

the short-circuit bridge according to Figure 6 in the connected state with the receptacle;

Figure 8

a fourth embodiment of a shorting bridge and receiving the holding bridge for this before connecting;

Figure 9

the short-circuit bridge according to Figure 8 in the connected state with the associated receptacle of the holding bridge;

Figure 10

a fifth embodiment of a short circuit bridge and an associated receptacle of the holding bridge before connecting and

Figure 11

the short-circuit bridge according to Figure 10 in the connected state with the associated receptacle.

The line connector shown in Figure 1 includes a first connector element 1 and a second connector element 2, which on a longitudinal axis 3 are shown centered, on which they move towards each other for connection become. The first connector element 1 has a first connector housing 4, which encloses a receiving space 6, in which the second connector element 2 occurs when connecting. Through the bottom of the connector housing 4 projects a number of first contact elements parallel to the longitudinal axis 5, for example in the form of contact pins, of which only one is shown is. The others can be stacked in several rows with respect to the drawing plane and be spaced into the plane of the drawing. At least However, two first contact elements 5 are provided, of which the second in the Leaf level lies behind the first contact element 5 shown. The contact element 5 extends through the bottom of the first connector housing 4 and is for example, into a device on the side facing away from the receiving space 6 and connected there for example with a printed circuit board or cables. The first connector housing 4 can have, for example, a flange with which it on the corresponding housing of the device or the component of the Vehicle is set.

In the receiving space 6 there is a holding web 7 which passes through it and which forms at least one receptacle on which a short-circuit bridge 8 is fixed, the then when the two connector elements 1, 2 are not connected to each other are, by means of contact arms that contact the first contact elements 5 in an electrically conductive manner and thus short-circuit. The design of the short-circuit bridge 8 in The form of different variants and the assignment to the holding bridge 7 is based on of the detail X, which is shown in the further figures for these variants, explained in more detail. The second connector element is also on the longitudinal axis 3 2 shown centered. It comprises a second connector housing 9 which 5 receiving chambers arranged according to the number of first contact elements 10 has, which run parallel to the longitudinal axis 3 and each have a second Pick up contact element 12. The receiving chambers 10 are by partitions 11 separated from each other. The second contact elements 12, of which only one of the first contact elements 5 is shown opposite, are each with a Cable 13 electrically conductively connected from the second connector housing 9 is led out to the rear. Furthermore, the second connector housing 9 a venting element 14 which serves to contact the contact arms of the shorting bridge 8 from the first contact element 5 when the two connector elements are plugged together 1, 2 to lift off, so that the two Contact elements 5, 12 can come into electrically conductive contact with each other and the short circuit is removed. This also applies to the further pair of contact elements 5, 12 to, which is offset from the plane of the drawing to the Visibly shown pair of contact elements 5, 12 is arranged so that the short-circuit connection between the two first contact elements 5 is canceled is.

With regard to the design of the short-circuit bridge and the receiving it and fixing sections of the holding web 7 are based on FIGS. 2 to 11 represent the detail X for a total of five variants, explained in more detail.

A first variant is explained in more detail below with reference to FIGS. 2 and 3. The other 4 variants are each explained using the following figures, the sections and components of the other four variants each with reference numerals are characterized by the numerical value 100 from each other differ.

In the embodiment according to FIGS. 2 and 3, there is a receptacle in the holding web 7 15 provided for the short-circuit bridge 8, which has a first flat support surface 16 and a second support surface 17 parallel thereto, which is rounded 18 are interconnected. The receptacle 15 further includes an edge which forms a first side surface 19 and a second side surface 20 which are parallel run to each other and laterally limit the first support surface 16.

The short-circuit bridge 8 is made of an electrically conductive sheet metal and comprises a substantially flat first support section 21 and one to the first Support section 21 parallel second support section 22, wherein the two support sections 21, 22 lie opposite one another and are arranged at a distance from one another and are integrally connected to one another by an arch section 25. The first Support section 21 has a first side edge 23 and an opposite side second side edge 24, with on the two side edges 23, 24 Engagement portions 29 are formed in the form of projections which in Slip-on direction F on the receptacle 15 lying on the front a flat flank 30 and have a steep flank 31 at the rear, the steep flank 31 being at right angles to the deferral direction F.

The second support section 22 is integrally connected to two contact arms 26, to the second support section 22 and beyond in its further course are angled again and in angled ventilation sections 28 ends. Contact zones 27 become in the angled area towards the venting section 28 formed, which come into contact with the corresponding first contact elements.

The assembled state shown in Figure 3 is achieved in that the short-circuit bridge 8 pushed onto the retaining web 7 in the area of the receptacle 15 is so that the first support portion 21 on the first support surface 16 and the second support section 22 comes to rest on the second support surface 17 and itself due to the spring action and preload tightly applied to this. The arch section 25 is adapted to the curve 18. At the same time when sliding in Direction F, the engagement sections 29 pressed into the material of the side surfaces 19, 20, i.e. the engaging portions 29 in the form of the projections cut into the Material of the holding web 7 and claw in this. It will be there since the first Connector housing is made of an electrically insulating plastic, which is softer than the material from which the short-circuit bridge 8 is made elastic form-fit achieved. In addition, the short-circuit bridge 8 through the side edges 21, 24 in connection with the side surfaces 19, 20 of the receptacle 15 secured against lateral or rotary displacement.

FIGS. 4 and 5 show a second variant in the form of short-circuit bridge 108 and the receptacle 115. There are components that correspond to each other with position signs provided by the numerical value 100 compared to the first embodiment according to Figures 2 and 3 are increased, so that for their description the corresponding description of Figures 2 and 3 is referenced.

The differences are explained in more detail below.

In contrast to the design according to Figures 2 and 3 are in the area of the side edges 123, 124 of the first support section 121 of the short-circuit bridge 108 in each case Engagement projections 129 punched out so that a triangular shape is formed and in Bent toward the second support section 122 so that the tips of the Engagement portions 129 oppose the second support portion 122. When postponed of the two support sections 121, 122 of the short-circuit bridge 108 to the Recording 115, the second support section 122 lies against the invisible second support surface 117, while the engagement portions due to the spring force 129 engage in the first support surface 116 and the short-circuit bridge 108 against Movements against the slide-on direction F on the retaining web 7 in the area of the receptacle Secure 115. The side surfaces 119, 120 secure the short-circuit bridge 108 or in particular the first support section 121 against lateral displacement and rotation.

The connected state is shown in Figure 5.

Figures 6 and 7 show a third variant of the short-circuit bridge 208 and the Recording 215, components or sections of the same as those of the first embodiment correspond to Figures 2 and 3, provided with reference numerals are increased by the numerical value 200 to those according to FIGS. 2 and 3. To the description of which is based on the corresponding description in FIGS 3 referenced.

In the embodiment according to FIGS. 6 and 7, the receptacle 215 corresponds practically the receptacle 115, as described in connection with Figures 4 and 5 has been. In the short-circuit bridge 208 there are 221 in the support section two engagement sections 229, which have a triangular shape, are punched out, so that still a connection on one side edge is preserved and bent over so that the Tips of these triangular projections towards the second support section 222 points. As in the embodiment according to FIGS. 4 and 5 also apply this embodiment according to Figures 6 and 7 in the assembled state, as shown in FIG. 7 shows the engagement projections 229 in the first support surface 216, so that a safeguard against shifting against the postponement direction F is given is.

FIGS. 8 and 9 show a fourth variant of the configuration of a short-circuit bridge 308 and a receptacle 315 in the holding web 7, with sections or elements thereof that correspond to those of the first embodiment according to FIG. 2 and 3 correspond to reference numerals corresponding to those in the figures 2 and 3 are increased by the numerical value 300, so that with regard to their Description referred to the corresponding description for Figures 2 and 3 becomes. In contrast to the design according to Figures 2 and 3 is in the range the first support surface 316 is provided with a web 33 which divides this support surface 316. The two opposite side surfaces 34 of the web act with the engagement projections 329 together, in the area of the opposite side edges a section 32 of the first support section 321 of the short-circuit bridge 308 lie. The engaging protrusions 329 correspond to those in the figures 2 and 3 described. When pushing on the short circuit jumper 308 with its two support sections 321, 322 onto the receptacle 315 of the holding web 7 the web 33 comes to lie in the cutout 32 and the engagement projections 329 engage in the side surfaces 34 of the web 33 facing away from one another and secure them this, as in connection with the embodiment according to FIGS. 2 and 3 described.

A fifth variant for a short-circuit bridge is shown on the basis of FIGS 408 and an imaginary receptacle 415 of the retaining web 7 explained. there only the sections and elements that are different from those of the first are described Embodiment according to Figures 2 and 3 are designed differently. Same Components or elements that are already in the embodiment according to FIGS. 2 and 3 are provided with reference numerals which correspond to those in FIGS. 2 and 3 are increased by the numerical value 400. With regard to their description, see the description in Figures 2 and 3 referenced.

The first support section differs from the embodiment according to FIGS. 2 and 3 421 divided into two sections. It comprises the base section 35 and one tongue 36 protruding therefrom, the two side edges facing away from one another 37 of the tongue 36 are provided with engagement projections 429, which are those in the figures 2 and 3 correspond. In the assembled state, i.e. in the in In the direction of arrow F pushed onto the receptacle 415, the base section lies 35 of the first support section 421 on the first support surface section 38 the first support surface 416 and the tongue 36 on the second support surface section 39 of the first support surface 416, the engagement portions 429 in the two side surfaces 419, 420, the side of the receptacle 415 in the region of the second support surface section 39 limit, intervene. This section is the shape of the tongue 36 customized.

LIST OF REFERENCE NUMBERS

1

first connector element

2

second connector element

3

longitudinal axis

4

first connector housing

5

first contact element

6

accommodation space

7

holding web

8, 108, 208, 308, 408

Shorting

9

second connector housing

10

receiving chamber

11

partition wall

12

second contact element

13

electric wire

14

lifting element

15, 115, 215, 315, 415

admission

16, 116, 216, 316, 416

first support surface

17, 117, 217, 317, 417

second support surface

18,118,218,318,418

curve

19, 119, 219, 319, 419

first side surface

20, 120, 220, 320, 420

second side surface

21, 121, 221, 321, 421

first support section

22, 122, 222, 322, 422

second support section

23, 123, 223, 323, 423

first side edge

24, 124, 224, 324, 424

second side edge

25, 125, 225, 325, 425

arc section

26, 126, 226, 326, 426

contact

27, 127, 227, 327, 427

contact zone

28, 128, 228, 328, 428

Lüftabschnitt

29, 129, 229, 329,

engaging portion

30

flat flank

31

steep flank

32

neckline

33

web

34

side surface

35

base section

36

tongue

37

side edge

38

first support surface section

39

second support surface section

Claims (8)

Comprehensive electrical line connector a first connector element (1), to which at least two first contact elements (5) are assigned, each of which is used for the electrically conductive connection of a cable or a printed circuit board, which forms at least one receptacle (15, 115, 215, 315, 415) which has a flat first support surface (16, 116, 216, 316, 416) and a second support surface (17, 117, 217, 317, 417) parallel to it at least the first support surface (16, 116, 216, 316, 416) is partially enclosed by an edge which has two parallel side surfaces (19, 20; 119, 120; 219, 220; 319, 320; 419, 420) has, and which is assigned at least one short circuit bridge (8, 108, 208, 3108, 408), which is made of an electrically conductive sheet-like material and has a flat first support section (21, 121, 221, 321, 421) and a second support section (22, 122, 222, 322, 422) at a distance from it, which is connected to the first Support section (21, 121, 221, 321, 421) is integrally connected, wherein both support sections (21, 22; 121, 122; 221, 222; 321, 322; 421, 422) are resilient to each other and with prestress on the associated Support surface (16, 116, 216, 316, 416; 17, 117, 217, 317, 417) of the associated receptacle (15, 115, 215, 315, 415) abut and the first support section (21, 121, 221, 321 , 421) has two opposite side edges (24, 124, 224, 324, 424), which between the side surfaces (19, 20; 119, 120; 219, 220; 319, 320; 419, 420) of the receptacle (15, 115 , 215, 315, 415) are held and which has at least two resilient contact arms (26, 126, 226, 326, 426) integrally connected to the second support section (22, 122, 222, 322, 422), and a second connector element (2), the one of the number of first contact elements (5) corresponding number of second contact elements (12) is assigned, which are designed to match the first contact elements (5) and each serve for electrically conductive connection of a cable (13) or a printed circuit board, and the a ventilation element (14) is assigned wherein in the unconnected state of the two connector elements (1, 2) the contact arms (26, 126, 226, 326, 426) are resiliently in contact with the first contact elements (5) and in the connected state of the latter they are out of contact by the ventilation element (14) are held to the first contact elements (5) and wherein the first support section (21, 121, 221, 321, 421) is provided with engagement sections (29, 129, 229, 329, 429) which fit into one of the receptacles (15, 115, 215, 315, 415) bounding surfaces (16, 116, 216, 316, 416; 19, 119, 219, 319, 419; 20, 120, 220, 320, 420). Line connector according to claim 1,
characterized in that on the side edges (23, 24) of the first support section (21) in each case at least one projection is formed as an engagement section (29) which has a flat flank (30) in the push-on direction (F) and one against the push-on direction (F) has a steep flank (31). Line connector according to claim 2,
characterized in that the steep flank (31) is at right angles to the push-on direction (F). Line connector according to claim 1,
characterized in that on the two side edges (123, 124) of the first support section (121) in each case at least one triangular projection is formed as an engagement section (129) which engages with its projecting tip in the first support surface (116). Line connector according to claim 1,
characterized in that at least one projection is formed on the first support section (221) as an engagement section (229) by punching and bending, which protrudes in the direction of the second support section (222) and engages in the first support surface (216). Line connector according to claim 1,
characterized in that the first support section (321) has a slot-shaped cutout (23) running parallel to the push-on direction (F), the opposite boundary edges of which are provided with projections which protrude towards one another as engagement sections (329), and that the first support surface (316) is provided with a Web (33) is divided, which lies in the cutout (32) and in whose corresponding side surfaces (34) engage the engagement sections (329). Line connector according to claim 1,
characterized in that the first support section (421) comprises a section designed as a base section (35) and a section as a tongue (36), the opposite side edges (37) of which are each provided with at least one projection as the engagement section (429), and in that the first Support surface (416) comprises a first support surface section (38) adapted to the base section (35) and a second support surface section (39) adapted to the tongue (36), the tongue (36) with its engagement sections in the side surfaces (419, 420) of the edge , which delimits the second support surface section (39). Line connector according to claim 1,
characterized in that a transition between the first support surface (16, 116, 216, 316, 416) and the second support surface (17, 117, 217, 317, 417) in the form of a curve (18, 118, 218, 318, 418) ) is provided and that the first support section (21, 121, 221, 321, 421) and the second support section (22, 122, 222, 322, 422) of the short-circuit bridge (8, 108, 208, 308, 408) by a Curve section (25, 125, 225, 325, 425) adapted to the course of the rounding (18, 118, 218, 318, 418).

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