IE58350B1

IE58350B1 - Plug-in assembly with electric fuse elements for distributors

Info

Publication number: IE58350B1
Application number: IE188186A
Authority: IE
Original assignee: Siemens Ag
Priority date: 1985-07-15
Filing date: 1986-07-14
Publication date: 1993-09-08
Also published as: DE3674095D1; EP0208926A2; NO862763D0; FI80819C; AU6012686A; EP0208926B1; FI80819B; IE861881L; FI862938A; NO862763L; EP0208926A3; FI862938A0; AU588342B2

Abstract

1. Plug-in assembly with electric fuse elements for distributors of telecommunications systems, preferably telephone exchange systems, the strip-like assembly having a plurality of stamped conductor paths (2) extending transversely to the longitudinal direction, at least partially embedded in a carrier component (1), and provided with cutouts (10) for accommodating and soldering connecting lugs of the fuse elements, the conductor paths being deflected in the region of the cutouts towards the component side of the carrier component, and the carrier component being provided with openings (8) in the region of the cutouts, characterized in that in the region of the cutouts (10) the conductor paths (2) extend parallel and/or obliquely to the component side and are freely accessible through the uncovered openings (8) from the other side of the assembly.

Description

PLUG-IN ASSEMBLY WITH ELECTRIC FUSE ELEMENTS FOR DISTRIBUTORS The invention relates to a plug-in assembly with electric fuse elements for distributors of telecommunication systems, in particular telephone exchange systems. An assembly of this kind is for example disclosed in DE-PS-23 838. In accordance therewith the strip-like assembly , possesses a plurality of stamped conductor paths which are * partially embedded in a carrier component and extend transversely thereto and which are provided with cutouts for accommodating and soldering connecting lugs of the fuse elements. In the region of the cutouts the conductor paths are bent at right angles towards the component side of the carrier component. The slotted cutouts are arranged at the exposed ends of the deflections. The fuse elements have their connecting lugs inserted into said cutouts. In order to obtain a small overall height the carrier component for the fuse elements possesses clearances in the form of apertures, into which the fuses partially protrude.

It has further been disclosed in German Utility Model 82 09 243 that the conductor paths may be embedded in the carrier component so as to extend in a flat manner and the connecting lugs of the fuse elements may be bent towards the cutouts. In the region of the cutouts in the conductor paths the carrier component is provided with uncovered openings, so that the connecting lugs are accessible from the base of the assembly and connection may be effected for example by flow soldering. However, there is the danger f that the ends of the connecting lugs, which protrude through * the cutouts, may protrude beyond the back plane of the assembly which can result in faulty contacts.

One aim of the invention is to provide an assembly which facilitates the connecting operation and wherein the danger of faulty contacts is reduced.

According to the present invention there is provided a plug-in assembly with electric fuse elements for distributors of telecommunications systems, preferably telephone exchange systems, the strip-like assembly having a plurality of stamped conductor paths extending transversely to the longitudinal direction, at least partially embedded in a carrier component, and provided with cutouts for accommodating and soldering connecting lugs of the fuse elements, the conductor paths being deflected in the region of the cutouts towards the component side of the carrier component, and the carrier component being provided with openings in the region of the cutouts, characterized in that in the region of the cutouts the conductor paths extend parallel and/or obliquely to the component side and are freely accessible through the uncovered openings from the other side of the assembly. The soldered junctions remain accessible from the side of the assembly remote from the fuse elements, as a result of the transverse or parallel deflection of the conductor paths to form the deflections, and the use of immersion or flow soldering processes thus remains retained. By insetting the cutouts in relation to the back plane of the assembly in deflections, the ends of the connecting lugs, which protrude through the cutouts, can be withdrawn to such an extent that they no longer protrude over the back plane of the assembly. It is even possible to avoid the need to cut off the connecting lug ends after the soldering operation.

In a preferred embodiment, in the region of the hole-shaped cutouts the conductor paths are trapezoidally bent and anchored in the carrier component on both sides of the deflection. Cutouts formed in some or all of the side legs of the deflections allow the connecting lugs to be accommodated.

The connecting lugs may be led to the deflections from different directions, allowing a closer spacing between them, so that the expansion of the connecting zone is reduced. Moreover the connecting lugs of the fuse elements which are arranged on both sides of the openings, may be linearly led to the connecting points.

Preferably the deflections and openings are aligned longitudinally along the carrier component, and a single longitudinal opening may provide access to a plurality of or all deflections.

Chambers are arranged on the carrier component to allow either two individual surge arresters with two varistors or a three-electrode arrester with two varistors to be accommodated in carrier components of the same type. The axially symmetrical arrangement in two surge arresters allows a symmetrical arrangement of the conductor paths, the central one being earthed. This arrangement is. simultaneously suitable for a 3-electrode arrester, wherein the electrode to be earthed is arranged in the centre.

One embodiment of the invention will now be further explained with reference to the accompanying drawings, in which: Fig. 1 illustrates a plan view of a plug-in assembly with electric fuse elements; Fig. 2 illustrates a section along line II-II of Fig. 1; and Fig. 3 illustrates a section along line III-III of Fig. 1 .

Referring to the Figures, an assembly for distributors of telephone exchange systems consists of a carrier component 1, conductor paths 2 which are partially embedded therein, varistors 3, and surge arresters 4, 5.

The varistors 3 and surge arresters 4 form fuse elements for the subscriber lines of the distributor. The surge •1 5 arresters serve for the macro-protection in order to shunt off high-energy currents. The varistors serve for the micro-protection of the exchange system by shunting off high energy charges, as occur for example by electro-static charging.

Depending upon the system requirements, two individual surge arresters 4 or one 3-electrode arrester 5 can be provided for a subscriber. The 3-electrode arrester 5 has the same function as two individual arresters 4.

The carrier component 1 is divided into individual receiving chambers for the fuse elements by intermediate cross-pieces 6. Each receiving chamber houses the fuse elements for a subscriber. Each receiving chamber is assigned three conductor paths 2. The central conductor path is connected to earth potential on one side of the carrier component. The outer conductor paths 2 lead to the opposite side of the assembly and form plug-in contact surfaces 7 for spring contacts of the distributor. The spring contacts are electrically connected to the subscriber lines .

The carrier component 1 is provided with an opening 8 which extends in the longitudinal direction and through which the conductor paths 2 are accessible for soldering from the side of the assembly remote from the fuse elements. In the region of the opening 8 the conductor paths 2 are trapezoidally bent towards the component side of the assembly, forming inclined lateral side legs and a central side leg defining the deflection. In the region of the deflection the conductor paths 2, which are anchored on both sides of the deflection in the carrier component, are provided with hole-shaped cutouts 10 for accommodating the ends of the connecting lugs 11 of the fuse elements 3, 4, 5. The cutouts 10 are arranged in all three side legs of the deflection, so that at least parts of the connecting lugs 11 can be linearly led to the cutouts 10.

As a result of the deflections the ends of the connecting lugs 11, which protrude through the cutouts, have an adequate clearance from the back plane of the assembly, so that it is ensured that faulty contacts cannot occur.

Claims

CLAIMS :

1. Plug-in assembly with electric fuse elements for distributors of telecommunications systems, preferably telephone exchange systems, the strip-like assembly having a 5 plurality of stamped conductor paths extending transversely to the longitudinal direction, at least partially embedded in a carrier component, and provided with cutouts for accommodating and soldering connecting lugs of the fuse elements, the conductor paths being deflected in the region 10 of the cutouts towards the component side of the carrier component, and the carrier component being provided with openings in the region of the cutouts, characterized in that in the region of the cutouts the conductor paths extend parallel and/or obliquely to the component side and are 15 freely accessible through the uncovered openings from the other side of the assembly.

2. Assembly according to Claim 1, characterized in that in the region of the hole-shaped cutouts the conductor paths are trapezoidally bent and anchored in the carrier component 20 on both sides of the deflection.

3. Assembly according to Claim 2, characterized in that a plurality of cutouts are respectively arranged in the region of the trapezoidal deflections.

4. Assembly according to Claim 3, characterized in that 25 the cutouts are arranged in the obliquely extending side legs of the deflections.

5. Assembly according to one of the preceding claims, characterized in that the deflections of all the conductor paths and the assigned openings are arranged aligned in the 30 longitudinal direction of the assembly.

6. Assembly according to Claim 5, characterized in that a continuous opening is provided for a plurality of or all deflections . Ί. Assembly according to one of the preceding claims, characterized in that on the component side of the assembly there are provided two surge arresters and two varistors in a receiving chamber for each pair of subscriber lines, in 5 which chamber the varistors and the surge arresters are f arranged diagonally opposite.

7. 8. Assembly according to one of the preceding claims, M characterized in that the fuse elements are arranged on both sides of the deflections.

8. 10 9. Assembly according to Claim 7 or 8, characterized in that a conductor path connected to earth runs in the centre of each receiving chamber and that two conductor paths connected to the subscriber lines respectively extend on both sides of the earthed conductor path.

9. 15

10. Assembly according to Claim 1, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.