DE2137027A1 - ASSEMBLY CARRIER FOR RECEIVING AND MUTUAL ELECTRICAL CONNECTION OF ELECTRONIC ASSEMBLIES - Google Patents

Description

Subrack for receiving and mutual electrical connection of electronic assemblies

The invention relates to a subrack for receiving and mutual electrical connection Pluggable electronic assemblies, in particular flat assemblies, with means for guiding and holding the Assemblies and a common wiring board that is perpendicular to the direction in which the assemblies are inserted.

Larger electronic circuit complexes are mostly divided into plug-in assemblies, mainly flat assemblies. It is known to provide housings designed to accommodate one or more rows parallel to one another plugged-in printed circuit boards are suitable. The printed circuit boards are usually upright with horizontal Insertion direction arranged to facilitate the flow of cooling air.

The housing accordingly consist, for example, of two vertical side panels, the width of which is approximately the same is the depth of the modules measured in the direction of insertion. Between the side panels there are for each assembly row an upper and a lower assembly guide arranged horizontally, the introduction of the assemblies facilitate and serve to hold them in the horizontal and vertical direction (assembly guide unit).

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The assembly guides are designed so that they Obstruct the flow of cooling air as little as possible. (See "Siemens-Zeitschrift", July 1966, issue 7, pages 562-566).

The wiring of the flat modules with each other and with The connection points for incoming and outgoing lines are made in a direction perpendicular to the direction of insertion Wiring level. The wiring level consists, for example, of a multilayered layer on the other housing parts attached circuit board, in the multi-pole pin headers as counterparts to the ones attached to the flat modules Zontakt spring strips are soldered. The required operating voltages, especially the operating earth (Reference potential, zero potential) are connected to the connector elements via so-called potential layers of the multilayer printed circuit board or brought up to the printed circuit boards. Signal connections and other connections are, as far as possible and appropriate, laid in the signal layers of the multi-layer circuit board. Furthermore must mostly be made use of the possibility of making wire connections between the over the circuit board produce protruding connection pins of the connector elements attached to it.

For many use cases, especially related With data processing systems it is necessary that the zero potential leads Wiring board of a unit extremely low resistance with the corresponding potential levels of the wiring boards of other units and with the Uullpotentialklemme to connect the power supply unit.

The zero potential plane is therefore connected several times to vertical, electrically good conductive Uull rails, the

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against the remaining parts of a mounting frame, z. B. one Cabinet frame, electrically, are insulated. To accommodate the fastening screws are along the side Edges of the "wiring board" holes provided that are surrounded on both outer surfaces by electrically conductive contact pads, which over metallizations of the The inner walls of the bore are connected to the potential position provided for the supply of the zero potential. It is known that the wiring board with the attached flat modules can be fitted without an additional housing to set the ITull rails, whereby this is sufficient stable execution at the same time act as a mechanical carrier. (Computer family Siemens 4004).

Multi-layer printed circuit boards are relatively sensitive and also, given the size that is used here expensive components, especially if they are already equipped with the connector elements. So it is questionable, all forces occurring on the assembly receiving device, such as weight and other acceleration forces, for example in the case of a vibration load can occur, transferred to the rack frame via the wiring board. Are particularly at risk the metallizations of the inner walls of the holes for Recording of the fastening screws, which are especially important when the mounting device is installed and removed several times or when Occurrence of shaking forces through the screw thread can easily be damaged.

The invention is based on a plug-in subrack for receiving and mutual electrical connection electronic assemblies, in particular flat assemblies, with one of at least one pair of horizontal

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lying assembly guides and two vertical side panels existing assembly guide unit for guidance and holding the modules and with a perpendicular to the insertion direction of the modules, on the Assembly guide unit fastened and formed from a multi-layer circuit board wiring board, that within the area delimited by the assembly guide unit with a multiplicity of for cooperation suitable with connector elements of the assemblies Connector elements is equipped.

It is the object of the invention to design a device of the type described above so that the Wiring board, the zero potential level of which should be connected to one or more Uull rails with low resistance, is at least largely relieved of force components acting in the vertical direction. It should continue to do so be possible to replace the wiring board without the actual assembly guide unit from the The rack frame must be removed and without the assemblies having to be removed from it.

"According to the invention this object is achieved in that the wiring board in a known manner on two opposite, over the assembly guide unit protruding vertical edge strip has bores, which are etched over metallizations of the inner walls of the bore with one for supplying the Jüull potential (System earth) provided potential position of the multilayer printed circuit board surrounded contact surfaces connected are which holes both for mechanical fastening

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the device at zero potential leading rails (zero rails) of a rack frame as well as multiple electrical connection of the zero rails with the zero potential position of the multilayer circuit board serve and that on both side plates with small vertical dimensional tolerances with respect to the holes in the multilayer circuit board guide means are arranged vertically above the center of gravity of the device, the in corresponding, attached to the frame and with respect to the with the holes in the multilayer PCB corresponding holes in the zero rail also tightly tolerated guidance; eri ■ -> :. ~ ι horizontal intervene slidably.

Further details can be found in the dependent claims and the description of an exemplary embodiment on the basis of FIG Refer to drawing.

Show it:

Fig. 1 is a simplified representation of the rack,

2 shows a section from the side wall of the assembly guide unit with a guide means according to the invention,

Fig. 3 shows a section of the frame with a Guide,

4, 5 show a horizontal section through the guide according to FIG. 3 with the subrack inserted without or with inserted handle.

The rack for receiving and. mutual electrical connection of electronic assemblies Fig. 1 is designed for two rows of printed circuit boards.

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The printed circuit board 1, na _w ch shown in Pig. is not yet fully inserted, carries a multi-pole connector element 2, for example a socket strip, on its front narrow side. The corresponding area 3 (pin strip) is attached to a wiring board 4 by soldering the connection lugs or the connection pins.

An upper and a lower assembly guide are provided for each assembly row as an insertion aid and to hold the assemblies. Each B3 assembly guide consists of two rails 5, 6, between which U-shaped webs 7 ψ are arranged as the actual guide elements. Side plates 8 and 9, with which the ends of the rails 5 and 6 of all assembly guides are screwed, complete the assembly guide unit.

The wiring board 4 is a multilayer circuit board with etched or printed conductor tracks. In such circuit boards As already mentioned, change large-area potential layers for supplying the operating voltages and the cooling potential with the signal layers, which are a multitude of discrete conductor paths for the transmission of signals included, from. The wiring board 4 with the inserted Connector elements 3 is attached to the assembly guide unit. The fastening is expediently carried out by multiple screwing to the front rails 5, all Assembly guides. This also prevents deflections in the Wiring plate largely avoided when plugging in or pulling out the modules.

To facilitate assembly when assembling the first time or when reinserting the wiring board later,

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for example, for the purpose of a possibly necessary Repair or wiring change had to be removed or replaced with another, it is appropriate to one of the front rails 5 of the Assembly guides preferably opposite the rail 5 of the top assembly guide, two dowel pins 10, 11 in press in the wiring board 4. These pins engage in a fitting hole or a fitting slot of the relevant Rail 5 and thus ensure a precise fit of the wiring board 4 on the assembly guide unit without the use of installation templates.

Axif the one on the right in FIG. 1, via the assembly guide the laterally protruding edge strips of the wiring board 4, the bores 12 to 15 can be seen, whose inner walls are metallized to create an electrically conductive connection between the zero potential position of the as a multi-layer printed circuit board to produce wiring board with the contact pads 16 to 19. In the opposite edge strip of the wiring board is formed in the same way.

With the help of screws that are guided through the holes, the contact pads are against (in the Pig. 1 not shown) zero rails pressed. As already described at the beginning, it has proven to be useful proved, these screw connections simultaneously for the mechanical fastening of the assembly receiving device to be used, whereby, of course, a sufficiently stable design of the zero rail is a prerequisite. For relief the wiring board of vertical force components,

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in particular to protect the relatively easily vulnerable metallizations of the inner bore walls (12-15) are on the side walls 8 and 9 of the assembly unit guide means, according to Pig. 1 cylindrical plates 20 attached. As counterparts to this, guides are provided on the frame, in which the guide means can slide horizontally.

The embodiment of such a guide according to FIG. 2 consists essentially of a solid metal block 21 with a guide groove 22, the side walls of which in the vicinity t of the open end of the groove slightly for easier introduction are bevelled. The metal block is flanged to the zero rail 23.

Fork-shaped parts or U-shaped parts can also be used as guides Rails are used. It is advisable to attach the guides to the zero rail in an insulated manner, since it is generally is desired or required, the metal parts of the assembly guide unit as well as the rack frame mi ^ LUsection of the zero rails with the protective earth of the energy. To connect the supply network and a connection of the zero potential (the operating earth) with the protective earth at most at one point in the whole system.

To achieve the desired relief of vertical forces on the wiring board, it is of course necessary to on compliance with sufficiently small tolerances for the position of the guide means on the assembly guide unit, based on the holes (e.g. 12 to 15) in the wiring board or the guides on the rack frame, . in relation to the bores that correspond to the bores just mentioned Holes in the zero rail, each in a vertical one

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Direction measured, pay attention. The size of the allowable tolerances depends on the difference between the ■ diameter of the holes and the shank diameter of the fastening screws away. To relieve the wiring board against forces acting upwards (vibration

. only

stress) a / small play of the guide means in the .guides is to be aimed for in the vertical direction.

It has already been stated that the guide means are arranged vertically above the center of gravity of the rack should be. However, this can only be done approximately, since the actual position of the center of gravity in the horizontal direction, which is practically the only one of interest here, not just the assembly of the subrack with assemblies, but also on how they are equipped with components. As a rule, the Swivel the subrack out of the vertical by a certain angle, as long as it is not yet with the zero rail is screwed. In order to limit the pivoting to a permissible level even in extreme cases, it is advantageous to give the guide means an elongated shape so that their horizontal extension is significant is greater than its vertical extent. The.Fig. 3 shows a guide plate 24 with essentially .parallel longitudinal edges and rounded ends. . Point in the middle the longitudinal edges have slight bulges 25, 26 upwards and downwards, which form the actual sliding bodies.

To remove the wiring board, it is not necessary to remove the rack from the rack. The assemblies also need from the assembly guide unit not to be removed, but only have to be pulled out so far that the connector

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elements are no longer in engagement with one another. This eliminates any risk of confusion between the assemblies and the Avoided risk of damage to the removed assemblies. Then there are only the screw connections of the Loosen the wiring board against the zero rails and against the assembly guide unit and the wiring board can be removed. In this state exists however, the possibility that the assembly guide unit falls out of its suspension and damaged or destroyed will. According to a further invention, there are therefore handles with an approximately U-shaped mounting bracket and a handle part attached to it. The handles are one on each side of the assembly guide unit, screwed to both the side plates and the zero rails using the mounting bracket. For a better understanding, a section of the subrack with the wiring board 4, the side plate 9, the assembly guide 5, 6, 7 and the guide plate 24 and the zero rail 23 with the guide 21 shown in simplified form. The wiring board 4 is on the zero rail by means of the screws 27 23 attached, d. H. the illustration according to FIG. 4 shows the subrack in its normal installed state. 5 shows the same section, but with the Difference that now the rack is pulled out of the rack frame that between the wiring board 4 and the zero rail 23 of the mounting bracket 28 of the handle 29 takes place. The mounting bracket is screwed to the side plate 9 and to the zero rail 23 and ensures a secure hold of the subrack in the rack. In connection with the handle part 30 facilitate the Handles after loosening the screw connection with the

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Zero rail the insertion and removal of the 'subrack in or out of the rack frame and "offer" a certain amount of space when the rack is removed Protection for the wiring board and the wiring pins protruding from its front.

5 figures

6 claims.

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Claims (6)

- 12 claims 1.> feaugruppentrager for inclusion and mutual electrical connection of plug-in electronic assemblies, in particular flat assemblies, with one from at least one pair of horizontal assembly guides and two vertical side panels Module guide unit for guiding and holding the modules, with one on the insertion direction of the modules standing vertically, attached to the module guide unit and made of a multilayer Circuit board formed wiring board, which is within the of the assembly guide unit limited area with a large number of suitable for interaction with connector elements of the assemblies Connector elements is equipped, thereby gekennzeichne t that the wiring board in a known manner on two opposite, over the, assembly guide unit protruding vertical Edge strip has bores that are etched, 'over metallizations of the inner walls of the bore with a for the supply of the zero potential (system earth) provided potential position of the multi-layer circuit board related contact pads are surrounded, which holes both for mechanical attachment of the Subracks on rails carrying zero potential (zero rails) of a rack frame as well as multiple electrical connection of the zero rails with the zero potential position of the multilayer circuit board are used and that on both side plates with small vertical dimensional tolerances with respect to the holes in the multilayer VPA 9/210/1042. - 13 - 209 885/0 69 2 Circuit board. Guide means perpendicular to the center of gravity of the rack are arranged in corresponding, attached to the rack frame and with respect to the holes in the zero rail that correspond to the holes in the multi-layer circuit board closely toleranced guides engage horizontally displaceably. 2. Subrack according to claim 1, characterized geke nn signs that the guide means in the Guides have only a small amount of play in the vertical direction. 3. Subrack according to claim. 2, that is, that the guide means as elongated plates are formed which each have a convex bulge in the middle of the upper and lower longitudinal edges exhibit. 4. Subrack according to one of the preceding claims, characterized in that that two handles with an approximately U-shaped mounting bracket and one on one leg vertically attached handle part are provided that the bases of the U-shaped mounting bracket with the Side plates of the assembly guide unit are screwed when the screw connections between the wiring board and the zero rail of the rack frame are solved and that in addition the free legs of the U-shaped mounting bracket can be screwed to the zero rail when the complete removal of the VPA 9/210/1042 -H- 20-9 8 85/0 69 2 -H- Assembly guide unit from the rack frame is not "intended". 5. Subrack according to claim 1, characterized ge indicates that the guides are insulated and attached to the null rails. 6. Subrack according to claim 1, characterized It is shown that two dowel pins are arranged on the multilayer circuit board near the upper edge which engage in a fitting hole and in a fitting slot in the uppermost assembly guide. VPA 9/210/1042 20988 5/0692