# Patent

## Title
Cable connector for printed circuit boards

## Abstract

The invention relates to a cable connector for printed circuit boards, said cable connector comprising a housing and at least two contact elements, each contact element being provided with a contact for connecting electrical wires, and a tuning-fork contact for contacting a printed circuit board. A surge arrester inside the housing is electrically arranged between the contact elements.

## Background
The invention relates to a cable connector for printed circuit boards.
DE 102 57 308 B3 has disclosed a connector for printed circuit boards, comprising a number of contact elements, the contact elements each having two connection sides, one connection side being in the form of an insulation displacement contact for connecting wires and the other connection side being in the form of a fork contact for making contact with connection areas on a printed circuit board, and a plastic housing in which the insulation displacement contacts of the contact elements can be inserted, the insulation displacement contact and the fork contact being arranged such that they are rotated towards one another, and at least one lower edge of the insulation displacement contact being supported on the plastic housing such that the contact elements are held in the plastic housing such that they are secured against falling out in the event of connection forces occurring on the insulation displacement contacts, the plastic housing comprising at least one region in the form of a chamber, and the fork contacts being completely accommodated in the longitudinal direction by the plastic housing, ribs being arranged on the inner sides in the region in the form of a chamber and defining the guides for the fork contacts, the contact regions of the fork contacts protruding beyond the ribs, and the ribs being beveled in the front region.
Such cable connectors serve the purpose, for example, together with a housing part which bears the printed circuit board, of forming a distribution board connection module, which has also already been described in DE 102 57 308 B3.
Such a distribution board connection module is also already known from DE 100 29 649 A1, comprising a housing in which input and output contacts are arranged such that they are accessible from the outside for connecting lines and wires, the housing being formed with a cavity in which functional elements are arranged between the input and output contacts. The functional elements are arranged on at least one printed circuit board which is supported in the housing, the functional elements providing, for example, overvoltage protection. In addition, the functional elements may also be filter circuits such as XDSL splitters.
The arrangement of the filter circuit on the same printed circuit board as the surge arresters has a few disadvantages, however. In addition to the increased production complexity in terms of population, in particular the number of contact points required for the line path is increased. However, the reliability of the distribution board connection module is thus decreased in particular if these contact points need to withstand high current loads. In addition, owing to the placement of the surge arresters on the main board, the physical area available there for the filter circuits is decreased. Furthermore, surge arresters usually require greater copper thicknesses, which is likewise reflected in the costs and space requirement. Such main boards are generally designed for a plurality of subscribers and are arranged in stacked fashion in rack systems. Furthermore, the complete main board needs to be removed in order to replace a defective surge arrester. In this case, subscribers which are not involved would also be interrupted and adversely affected. As an alternative, the surge arresters could also be plugged onto the cable connector from above, in this case, however, the contacts no longer being freely accessible for jumpering.
The invention is based on the technical problem of providing a cable connector by means of which overvoltage protection of the wires or lines to be connected can be implemented in a simple and cost-effective manner.
For this purpose, a surge arrester which is arranged within the housing is arranged electrically between the contact elements. This brings about a number of advantages. Firstly, a main board can now be used more effectively in terms of space. Secondly, the overvoltage protection takes place even before the main board and overvoltages can be dissipated directly at the point of entry. In particular, in embodiments having only two contact elements per subscriber, the cable connector may be withdrawn in the case of defective surge arresters and the defective surge arrester or the cable connector as a whole can be replaced without the other subscribers being disrupted. In an embodiment having four contact elements, only one other subscriber would be disrupted.
In one preferred embodiment, the surge arrester is connected to the contact elements such that it can be detached. This means that, in the event of there being a defect in the surge arrester, only this surge arrester need be replaced and not the complete cable connector. Furthermore, this also has advantages as regards ease of recycling.
In order to arrange the surge arrester such that it can be detached, in each case a further fork contact is preferably arranged on the contact elements. The shape of the fork contacts is in this case preferably matched to the shape of the contacts of the surge arrester.
In a further, preferred embodiment, the fork contacts for the printed circuit board (main board) and the surge arresters are aligned parallel to one another, the fork contact for the printed circuit board (main board) being arranged in the region of the side walls of the housing, and the fork contact for the surge arrester being moved laterally inwards. This makes optimum use of the physical space for the cable connector, since the surge arrester is positioned between the fork contacts for the printed circuit board (main board). The fork contact for the printed circuit board preferably protrudes up to the lower edge of the housing such that it is largely guided in the housing.
In a further, preferred embodiment, the fork contact for the surge arrester is moved back into the housing and/or is displaced parallel to the fork contact such that the surge arrester with which contact has been made does not hinder the insertion process on the printed circuit board.
In a further, preferred embodiment, the surge arrester is arranged on a separate printed circuit board, which significantly simplifies in particular the replacement process.
In a further, preferred embodiment, fine protection elements such as PTC resistors and diodes are arranged on the printed circuit board (main board).
In a further, preferred embodiment, the housing of the cable connector is of two-part design.
In a further, preferred embodiment, the contact elements are of two-part design, one contact part comprising the contact for connecting the wires and the other contact part comprising the fork contact for the printed circuit board (main board), each contact part comprising a resilient contact arm which together form an isolating contact.



The invention will be explained in more detail below with reference to a preferred exemplary embodiment. In the figures:
FIG. 1 shows a perspective view from below of the cable connector without a lower housing part,
FIG. 2 shows a perspective view from below of the cable connector with a lower housing part,
FIG. 3 shows a side view of the cable connector with an upper and a lower housing part,
FIG. 4 shows a cross section along the section A-A,
FIG. 5 shows a cross section along the section B-B, and
FIG. 6 shows a plan view of the cable connector.



FIG. 1 shows a perspective lower view of the cable connector 1 without a lower housing part 2 (see FIG. 2). The cable connector 1 comprises an upper housing part 3, in which contact elements 4 can be inserted from below which are guided through corresponding guides in the housing part 3. The contact elements 4 are of two-part design, a first contact part 5 comprising two fork contacts 6, 7 which are connected to one another via a U-shaped bend 8. In addition, a resilient contact arm 9 (which can be seen particularly well in FIG. 4) branches off upwards from the U-shaped bend. The second contact part 10 comprises an insulation displacement contact 11 (see FIG. 4) and a further resilient contact arm 12. The two resilient contact arms 9, 12 then form an isolating contact (see FIG. 4). The two fork contacts 6, 7 are in this case aligned parallel to one another, the fork contact 7 however being moved upwards (in the direction of the upper housing part 3) and displaced parallel (away from the U-shaped bend 8). Furthermore, the cable connector 1 comprises a printed circuit board 13 on which a surge arrester 17 is arranged (see FIG. 2). Contact is in this case made with the printed circuit board 13 via the two fork contacts 7. However, in this case the fork contacts 6 remain freely accessible owing to the moved arrangement of the fork contacts 7 such that contact can be made with a further printed circuit board having functional elements (main board) via said fork contacts 6. The printed circuit board 13 also has a ground contact 14, by means of which a ground connection, for example via a mounting rack, can be produced. The upper housing part 3 is formed on the side faces with latching lugs 15 which serve the purpose of latching with the lower housing part 2, as is illustrated in FIG. 2. The housing part 3 also has latching openings 16 which serve the purpose of accommodating latching knobs of a plug (not illustrated). The lower housing part 2 likewise has latching lugs 18, by means of which the cable connector 1 can be latched with a further housing (not illustrated) which bears the main board.
FIG. 3 shows a side view of the cable connector 1, the cross sections along the section lines A-A and B-B being illustrated in FIGS. 4 and 5, respectively. FIG. 4 illustrates how the second contact part 10 is supported on a bearing 20 of the lower housing part 2, as a result of which the connection forces occurring are absorbed by the housing. It is also illustrated how the two resilient contact arms 9, 12 form an isolating contact 21. Provided in the upper housing part 3 is an insertion channel 22, in which an isolating plug or test plug (not illustrated) can be inserted which can be used to isolate the isolating contact 21. If the isolating plug or test plug is withdrawn again, the two contact arms 9, 12 spring back again and make contact with one another.
FIG. 6 shows a plan view of the cable connector 1 such that, in particular, the elongated insertion channel 22 can be seen as well as the rotation of the insulation displacement contacts 11 through 45° towards the fork contacts 6, 7.
LIST OF REFERENCE NUMERALS


    1 Cable connector
    2 Housing part
    3 Housing part
    4 Contact element
    5 Contact part
    6 Fork contact
    7 Fork contact
    8 U-shaped bend
    9 Contact arm
    10 Contact part
    11 Insulation displacement contact
    12 Contact arm
    13 Printed circuit board
    14 Ground contact
    15 Latching lug
    16 Latching opening
    17 Surge arrester
    18 Latching lug
    20 Bearing
    21 Isolating contact
    22 Insertion channel

## Claims

1. A cable connector for printed circuit boards, comprising:
a housing;
at least two contact elements, each contact element comprising a first contact for connecting electrical wires and a second contact for making contact with a printed circuit board, wherein the first contact and the second contact of each contact element are accessible from an exterior of the housing; and
a surge arrester arranged within the housing and arranged electrically between the contact elements.

2. The cable connector as claimed in claim 1, wherein the surge arrester is connected to the contact elements such that it can be detached.

3. The cable connector as claimed in claim 2, wherein the second contact of each contact element is a fork contact, and wherein a further fork contact, by means of which contact is made with the surge arrester, is arranged on each of the contact elements.

4. The cable connector as claimed in claim 3, wherein the fork contacts are aligned parallel to one another, the fork contacts for the printed circuit board being arranged at side walls of the housing, and the fork contacts for the surge arrester being arranged such that the fork contacts for the surge arrester are positioned laterally inwards from the fork contacts for the printed circuit board.

5. The cable connector as claimed in claim 3, wherein each fork contact for the printed circuit board protrudes up to a lower edge of the housing.

6. The cable connector as claimed in claim 3, wherein each of the fork contacts for the surge arrester is positioned back into the housing and is displaced parallel to the fork contacts for the printed circuit board.

7. The cable connector as claimed in claim 1, wherein the surge arrester is arranged on a second printed circuit board.

8. The cable connector as claimed in claim 1, wherein fine protection elements for overvoltage protection are arranged on the printed circuit board.

9. The cable connector as claimed in claim 1, wherein the housing is of two-part design.

10. The cable connector as claimed in claim 1, wherein the contact elements are of two-part design, one contact part comprising the first contact for connecting the wires and the other contact part comprising the second contact for the printed circuit board, each contact part comprising a resilient contact arm which together form an isolating contact.

11. A cable connector for printed circuit boards, comprising:
a housing having a first end and a second end;
first and second wire connection contacts located at the first end of the housing;
first and second outer fork contacts located on opposite sides of the second end of the housing;
first and second inner fork contacts located at the second end of the housing spaced inwardly from the first and second outer fork contacts, the inner fork contacts being displaced parallel from the outer fork contacts;
a printed circuit board connected to the inner fork contacts;
a surge arrester positioned on the printed circuit board so that the surge arrester is arranged electrically between the inner fork contacts.

12. The cable connector as claimed in claim 11, wherein the surge arrester is connected to the contact elements such that it can be detached.

13. The cable connector as claimed in claim 11, wherein the housing is of two-part design.

14. The cable connector as claimed in claim 11, wherein fine protection elements for overvoltage protection are arranged on the printed circuit board.

15. The cable connector as claimed in claim 11, wherein the first outer fork contact and first inner fork contact are integrally formed and wherein the second outer fork contact and second inner fork contact are integrally formed.

16. The cable connector as claimed in claim 15, wherein the first wire connection contact includes a resilient arm that cooperates with a resilient arm of the first outer fork contact to form a first isolating contact.

17. The cable connector as claimed in claim 11, further comprising a second printed circuit board connected to the outer fork contacts, the second printed circuit board being parallel with the printed circuit board on which the surge arrester is positioned.