Untitled record

Subrack with shielded stackable modules

The present invention relates to a sub-rack for telecommunications, with a plurality of plug-in #ftugruppen, consisting essentially each of at least # 1ner printed circuit board and a mounted front of a longitudinal edge of the printed circuit board front panel.

From DE-OS 34 02 714 a shielded / in subrack pluggable assembly is known, is in the tf1e circuit board #ngordnet within a shield. The shielding consists of two #lechteilen, which are each formed on two opposite fctitenwänden with an inwardly open, in cross-section U-shaped guide rail. #ie guide rails of the first sheet metal part include the circuit board and the guide rails of the second sheet metal part are pushed with positive engagement on the guide rails of the first sheet metal part. The thus encapsulated circuit board forms an assembly that can be inserted vertically into corresponding guide rails of the rack.

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Another shielded plug-in module is known from DE-OS 35 29 360. The assembly consists of a 4! Λ five-sided closed, cup-shaped shielding cap with a frame-like lid. The printed circuit board of the assembly is attached to the cover of the shielding cap together with a connector. The narrow longitudinal sides of the screening cap are each provided with inside and outside, mutually aligned strips. These form a common homogeneous so shaped bar that the shield has inside guides for inserting the circuit board and outside guides for inserting the module in a rack.

Gas complete shielding each individual assembly Kittels multi-part metal housing, however, is relatively complicated and expensive, since the subrack of known designs are anyway disguised to the mating side «it sheet metal plates and already constitute a • inside open shielding cage.

The invention has for its object to shield in a Caugrupoentrager according to the preamble of claim 1 dse Kittels plug-in modules closable front against • lektromagnetic interference and strength. This object is achieved by 4lie specified in the characterizing part of this claim constructive measures. Further embodiments can be found in the subclaims.

The invention will be described in more detail with reference to an embodiment shown in drawings as follows. In the drawings show:

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1 shows a plug-in module with a view of the resilient part of the Abschirffieinriehtung, in a perspective view.

Fig. 2, the assembly of FIG. 1 with a view of the

rigid part of the shielding device and a prepared for mounting shield / in perspective view;

Fig. 3 two juxtaposed assemblies with shielded front, in plan view.

In FIGS. 1 to 3, the pluggable module is designated overall by 1. It consists essentially of a front panel 2 and at least one firmly connected to the front panel 2 circuit board 3. The front panel 2 is arranged so that it covers the longitudinal side of the upstanding printed circuit board 3, for example, attached to the front plate edge connector (not shown) by corresponding openings 5 ​​of the front panel protrude.

The front panel 2 consists of a metal rail, ie>. at least in which the longitudinal side of the circuit board 3 covering area has a U-shaped cross-section. As a result, a first and a second to the back of the module 1 facing leg 6, 7 are formed. The first leg 6 carries a correspondingly sized spring strip 8, which is semi-cylindrical bent or similar in cross-section to a horizontal, flat C and whose longitudinal sides are directed to each other, so that it has the overall shape of a threshold with a flat bottom. Narrow slits next to each other are at right angles to the longitudinal axis of the strip with a relatively small pitch

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cut into the convex part which divides the spring strip 8 in a larger number of individual spring sections 10. The spring strip is preferably secured by means of a retaining strip 11 on the first leg 6 of the front panel 2, although it may also be connected directly to this (Figures 1 and 3).

The existing sheet metal retaining strip 11 has a the base portion of the spring steel strip 8 adapted i

C-type cross-sectional profile and is mechanically and electrically conductive by riveting or jj by spot welding | connected to the leg 6 of the front panel 2. There !'

between the edges of the facing longitudinal sides of the spring strip 8 is a gap, the strip can easily from the top of the open? Retaining bar self-depressing pressed and, if necessary, be taken out again. An additional fixation of the ■,

Federblechstreifens 8 in the retaining strip 11 is possible, but normally not required.

The second leg 7 of the front panel 2 is formed for contacting with the Federblechstreifen an adjacent plugged into the rack assembly. Depending on the susceptibility of the assembly 1 against penetrating elekromagnetIsche waves this second leg 7 is either flat, so that all spring portions 10 of the adjacent Federblechstreifens come to rest or he has on the outside of several raised contact nubs 12, where in each case only the opposite spring portion comes to the plant (Flg. 2 and 3). This offers the advantage that the required StörfestIgkeit and interference radiation of the electromagnetic shield between two modules by the variable number of contact nubs 12 the

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Can be adapted to requirements. The fewer contact nubs need to be provided, the lower is the force required to insert and remove the assembly 1.

Furthermore, the second leg 7 of the front plate 2 is provided with at least one inwardly cranked ground lug 13, which is connectable for connection to a ground potential leading trace or a ground pad of the circuit board 3. In addition, the second leg 7 at least two inwardly cranked retaining tabs 14 which are arranged so that between these and the inside of the leg 7, the end of the circuit board 3 covering the shielding plate 17 can be inserted (Fig. 2). At the other end, the shielding plate is placed, for example, on provided on the back of the module 1 coding plates 15, the associated power strips 16 are located on the other side of the plate. The shielding plate 17, the coding plate 15 and the connector strip 16 are fastened together with the inclusion of the printed circuit board 3 by means of tubular rivets or screws (FIG. 3).

In a fully populated rack (not shown) with modules 1, which are in principle the same design, but may also have different widths front panels 2 and more circuit boards, the side parts are inside complementary to the outside of the next inserted module 1 is formed. That is, the second leg 7 of a first assembly 1, an example provided on the left inside of the rack spring strip 8 and the first leg 6 of a last module fixed spring strip 8 one on the right

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Inside the subrack disposed rail contacted, which has the same function as the second leg 7 of the front panel 2. The rail of the rack therefore either has a flat surface or it is provided with a more or less large number of raised contact nubs 12.

Instead of the side parts of the rack whose interior can also be divided with shielding plates, so that, for example, between two unshielded, a shielded plug-in receptacle for several modules is available. In this case, the inner sides of the shielding plates facing the pluggable assemblies 1 are designed to be complementary to the contact and shielding device of the assemblies.

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