DD145828A1 - LOADABLE MULTIPOLE ELECTRICAL CONNECTION DEVICE - Google Patents

Abstract

The invention relates to a corresponding Anschluszvorrichtung for assemblies, in particular printed circuit boards in electrical equipment and systems u. a. of communications engineering, data processing, metrology, automation technology. The aim and task is to provide a corresponding device that allows repeated and rapid connection and disconnection of the modules without inadmissible damage and allows a high reliability in the closed state. According to the invention, the object is achieved in that contact pieces are mounted on a printed circuit board and form a plug-in connection in a carrier rail and connected to the connection leads, each contact piece and contact piece additionally having a square bar for a winding connection. These Vierkantstaebe are connected in the mated state after Trial conclusion by Drahtstuecke loesbar by means of winding connections, the Drahtstueck between the square bars are as close as possible to the surface of the carrier rail. In the Traegerschiene are still brackets for mounting the insulated Anschlußuszleitungen present.

Description

Detachable multipolar electrical connection device

The invention relates to detachable electrical connection devices for all modules (in particular printed circuit boards) in electronic devices and systems u, a. communications engineering, automation technology and electroacoustics, which must be electrically connected to each other or to other devices or parts of the system via several cable cores «,

Characteristic of the Known Technical Solutions Currently, three basic methods of electrical connection of electronic and electrical assemblies with cable cores are common: Through multiple connectors, through solder connectors and through wire-wound connections (Hildebrand, Feinmechanik, Bauelemente, VEB Verlag Technik Berlin, p Elektroniker (1979) H. 2, pp. 10-12). The known connector v / iron following disadvantages that such "T ₀ of the required generally high reliability (especially the very large number of mating cycles reliably performed) are determined: Relatively large size, high manufacturing and assembly costs '' The process of Soldered connections do not have these disadvantages, but considerably complicates the assembly and service (KunzEiann: Plugging or hardwire? Feingerätetechnik 27 (1978) H "5, p 207 · .208). The solder joint also has the disadvantage that after one to several times separating and closing the connection, the environment of the solder joint is damaged as a result of heat and LötmitteIeinv / irkung (in particular the insulation), so that the reliability suffers greatly. In spite of the disadvantages associated with this, small electronic assemblies are mainly connected by means of solder joints.

Often, instead of solder joints, winding compounds have recently been used; they avoid the disadvantages of thermal damage and contamination, but generally do not permit repeated opening and closing because a unwound wire end is not reusable.

• VAE

35 t

There is a variety of special to PCBs einsatzbaren Anechlußelementen known or soldering ₀ banding of connecting cables allow (ζ «Β DE-OS 2,228,953;. DE-OS 2,321,041)," You have already mentioned disadvantages _e A other * as PrüfStellenkontakt designated connection element for printed circuit boards (DE-AS 1 276 767) allows the optional soldering a lead or the insertion of a Kontaktmesserso As a special feature of this element is important that it by means of two legs (pin-shaped projections) in the circuit board against rotation and with high electrical reliability is attached.

All known plug, solder and winding connection elements disadvantageously have no kink protection for the connecting wire, so that wire breaks occur in vibration stresses. The known solder and winding connection elements can be easily arranged on the module in rows for the purpose of forming multi-pole terminal connections, but also do not allow for the reasons described no quick and easy separation and closing «. _:

Object of the invention

The aim of the invention is _s a detachable multi-pole terminal device for electronic components - to provide on leads that allows repeated and fast connection and disconnection of the assembly at low technological outlay, low price and requires little space and a closed condition - in particular for small circuit boards very high reliability and no disconnection of the leads and assembly occurs during disconnection

Presentation of the sense of invention

The technical object of the invention is to circumvent the disadvantages of the known connection elements and connection devices mentioned in the prior art, and in particular to replace those operations and methods which result in unacceptable damage during disconnection and connection by means of a device new connection device

have the highest possible mechanical and electrical reliability by combining suitable means *

According to the invention, the object is achieved by providing an insulating plate (z, B of a printed circuit board) in a row with a number of similar metallic contact pins of a simple design "The number of contact pieces corresponds to the number of the insulating plate - the same Part of an assembly can be connected to a wire core. The contact piece contains a contact blade and a square pin for the attachment of a winding connection. Each contact also has at least one pin-shaped or flat leg to its attachment in appropriate openings or holes in the insulating plate and the Herstellumg the electrical connection between it and the associated point of the electronic or electrical circuit of the insulating or «the assembly. The contacts are preferably made of sheet metal, z * B «by punching or Pormätzen.

To each of the connecting wires is a simple metallic contact part is connected, which for a suitable on-closing facilities (such _a as a soldering eyelet for wire and litzenförmige connection lines or a square rod for Y / ickelverbindung at wire-shaped lead) has "Besides, the contact part of a contact spring and a fourth square pin for a winding connection. This square pin and the corresponding square pin of the corresponding associated contact piece is in the inserted state after completion of tests to increase reliability by a Diaht piece by two Wioke! Connections electrically connected, v / obei the piece of wire between the square bars as close to the surface of the support rail befindete

All contact parts are held captive on 'an insulating support rail captively loose. The support rail also has for each connection wire insulation including a suitable receptacle, e.g., B _e, a bore or a groove ·

It is also'admissible to arrange the contact spring on the contact piece and the contact blade on the contact part. «To establish the connection between ö.en connecting wires and the Baugruppe the support rail with the contact parts (which are connected to the connecting wires) so on the contact« 8tuekr © placed in the assembly that the contact springs come into contact with the contact blades in a known manner in mechanical and electrical contact ,, Thus, the desired electrical connection is made quickly and the assembly with the device or system fully functional. By removing the carrier rail of the assembly can be just as quickly disconnect the connection again. "Up to this point, the operation of a known multiple plug connection corresponds. As soon as Erprobunbgen completed with this simple connector assembly are completed, all connectors according to the invention additionally bridged by short pieces of wire «This is done by Anwickeln each of the two ends of a short piece of wire to the mutually associated square bars of contact piece to contact part * These pieces of wire also cause by tightest possible attachment to the surface of the support rail _s If necessary (z * B "or for troubleshooting, replacement of the module), the secure, vibration-proof mounting of the support rail on the insulating these wire pieces can be removed using known tools the winding technique easily again without damage occur on the module or on the connection lines; so again is the original state of the easy replacement of the module produced according to the repair o "ä _e the additional connections are made using new pieces of wire again"

The following failure rates of electrical connecting elements are known from the literature (reliability of electrical components, VEB Verlag für Grundstoffindustrie _t Leipzig 1973) J 10 hj "(in addition '/! - = O _s 0002 JjO ° hj"' ¹ for each plug-in operation)

Solder '% = 0.0003 ,,, 0.00S [iO ⁶ hj "* ¹

_Winding compound j ¹ = 0.000004, _ββ 0.00ΐ ΓΐΟ ^δ h! ™ " ¹

Even with extremely simple (cheaper) version of the existing contact and contact spring connector, the expected (estimated) high failure rate of 3 "^ - JiO hj completely for an undisturbed and economical commissioning or repair _e

This results in arithmetically following resulting failure rates for each connection of the module to a connecting wire:

known / plug-in connection for & 0,0033 * ο «0,047 [ΐθ ⁶ hj" ¹

known solder fr ^ 0.0003 _"9O 0.006 P] O hj ~ ¹

known winding connection / i ^ VO, 00000 ".. 0 ^ 001 MOH]" * ¹

inventive solution. / ^. ^ 0,00000, .. 0,0Oi fib hl "" ¹

unfavorable value when off

fallen connector / ^^ 0,000012 * _{0 0} 0,003 JiO ⁶ hj '

The reliability of the e.rfindungsgemäßen connection connection is therefore substantially larger than that of the known plug and solder connection and achieves the values of the known Wickslverbindungj particularly reliable without the separation and connecting technology involved in these arrangements. In addition, the erfindungsge- -mäßige arrangement further advantages relating to the secure fastening and protecting against wire breakage holder of the leads.

Example 1

An embodiment of the invention is shown with further details in the Pig, 1 to 3 «

Pig. FIG. 1 shows a perspective view of a carrier machine mounted on printed circuit boards, with four connections in different assembly states, with some sections being cut for better recognition. are shown broken «

Fig. 2 shows a contact piece in the main view.

Pig. 3 shows in the main view a contact part in its state before mounting in the carrier rail *

On a printed circuit board 1 of the module to be connected, a first contact piece 2 "as shown in Fig. 1 is used vertically in the bores 3, 4 and soldered from below with (not shown) conductor tracks. Further contact pieces 5, 6, 7 are fastened in the same way in similar bores of the printed circuit board 1; they form a straight front with mutually parallel surfaces and equal distances from each other and are held during the soldering by a guide rail in this position and against the circuit board 1. In the parts which receive the contact pieces 2, 5, 6, 7, this guide rail is designed similarly to the carrier rail described later.

All holes of the printed circuit board 1 for receiving contact pieces 2, 5, 6, 7 lie at the crossing points of a square grid 2.5 mm.

Fig. 2 shows a contact piece 2, S, 6, 7 made of a flat sheet metal. Me Schenkel8dienen for attachment in the holes 3, 4 of the circuit board 1 «, perpendicular to the legs 8, a contact blade 9 is attached ₉ whose cutting edges 10 are chamfered on both sides. In addition, in the rearward extension of one of the legs 8, there is a guide shaft 11 with parallel longitudinal sides, which merges into a square bar 12. The square bar 12 has the dimensions required for angle connections The contact pieces 2, 5, 6, 7 are made of one material which is commonly used for plug-in contacts, for _e B * Ha ^ tmessing or bronze and may be provided with a coating.

The ends of the electrically to be electrically connected to the assembly four leads 13 are in a cuboid support rail 14 of plastic material sufficient dimensional stability, Zo B _e polystyrene »fixed» This support rail 14 contains firstly at the bottom four, each with a continuous rectangular shaft 15 connected to the small side surface parallel slots that are dimensioned together _? that arranged on the circuit board 1 in the manner described four contact pieces 2; 5; '6; 7 find room in them with a slight play * On the open side, these slots extend downwards with slight slants 16 «

if · rs f tr- <e% K & T *

-OJ-, & β ^ ^ «! Is? £ äs

Second, in the support rail 14 four vertical continuous rectangular ducts 17 which are completed at their upper ends by short cuboid webs 18 so that they expire there in two short Rechteckachächte ₀ each shaft 17 is symmetrical to a rectangular shaft and crosses the same Slot at right angles «In each of these shafts 17, a contact part 19 is inserted from below with a light play.

Fig. 3 shows such a contact part 1 "" "" "~~" "----"

It is made of a flat, spring-hard metal sheet, similar to the contact pieces 2, 5, 6, 7 ^and 3, as they may have a coating. The contact member 19 has the shape of a double fork with parallel longitudinal sides, wherein the lower tines 20 have at their ends facing each other Kontaktwölbungen 21 with funnel-shaped outlet. The distance between the contact convexities 21 is slightly smaller than the thickness of the contact pieces 2, 5, 6, 7 in the area of the contact blades 9. The other pair of tines has the shape of two parallel square bars 22, 23 similar to those of the contact pieces 2, 5; 6, 7 · The edge 24- of the connecting web between the square bars 22, 23 is arranged so that the inserted into the support rail 14 Kontakteil 19 with her. the lower edge of the web 18 abuts while the tips of the tines 20 are slightly within the outer surface of the support rail 14 _e in this position each of the (left) square bar 23 is double-angle, cranked around the outer edge of the shaft 17; Thereby, the contact parts 19 are captive, but slightly movable, held in the support rail third Third are in the support rail 14 each right next to each slot 15 a parallel to their base and the small side surface receiving bore 25 having a diameter which is approximately the outer diameter of the isolated Anscnllußleitungen 13 and until just before the shaft 17 extends. These receiving bores 25 are extended by smaller through-holes (not shown), but do not touch the shafts 17 *

The stripped at the ends connecting leads 13 are up to the stop of the insulation at the end of the mounting holes

inserted, so that the bare conductor ends 26 protrude at the back of the Trägerschiene'14. These conductor ends are bent up and secured by means of known winding technique individually at the ends of the bent square bars 23 of the contact parts 19 electrically and mechanically durable; so that the leads 13 are secured secured against Dpahtbrüche «, If in the leads 13 strand-shaped conductors are used} the attachment of their conductor ends 26 takes place at the square bars 23 by soldering *

Thus, the first assembly stage of the electrical connection device is realized according to the embodiment; the carrier rail 14 with the connecting leads 13 connected thereto can be plugged onto the assembly. "Only the square bars 12 of the contact pieces 2, 5, 6, 7 enter the slots 15 of the bottom rail 14 from below _. the following Führungssehaft 11 center the support rail 14 so that the contact curvatures 21 of the contact parts 19 the chamfered cutting edges 10 of the contact pieces 2, 5, 6, 7 meet so that they can slide on the contact blades 9 on both sides As a result of this the necessary spreading of the prongs 20 results in the necessary contact pressure "the K _o ntaktmesser 9 dive * If the underside of the carrier rail 14 essentially rests in the slots of the rectangular slots on the surface of the circuit board 1, the process of connection is terminated and the assembly is electrically connected to the device or equipment via the leads 13 and can be tested. This situation is shown on the left in FIG. 1. The position of the contact piece 2 together with the associated contact part 19 is indicated when the carrier rail 14 has been broken off, while the contact piece 5 has been broken off at the level of its contact blade 10 and the associated contact part 19 has not been drawn make other details more visible *

The disconnection of the connecting device takes place by simply removing the carrier rail 14 with the connection lines 13 ·

. If the testing o _f the like is finished, v / ground using four short pieces of wire 27 each already have contact blade 9 and K _o ntaktwö'lbungen 21 connected portions are electrically connected in addition; This is done by Anwickeln the ends of each of a piece of wire 27 to the square bars and 22 "In this case, each piece of wire 27 so ge sets _f that the square bars 12 and 22 connecting part rests on the top of the support rail 14. This prevents that the carrier rail 14 can stand out from the circuit board 1. (2nd assembly stage)

When the need for loosening the terminal connection occurs, simply remove the wire pieces 27 after winding their winding connections using a known tool; This again unrestricted 1, assembly stage reconstructed and the terminal device acting as a frequently actuated plug-in device. Then again

"i

in the described way, the 2nd assembly stage can be produced «

The terminal device of the embodiment has the further advantage that it can be placed anywhere on a printed circuit board; it does not have to be fastened to the edge of the circuit board, as is the case with many known devices.

A four-pole connecting device according to this Ausführungsbeiispiel is including the winding connections in the dimensions 6 mm wide, 12 m long and. 11 mm high possible.

A variant of the embodiment in which the leads are inserted into receiving bores, en the top of the support rail, the dimensions 9 mm wide, 12 mm long and 11 mm high required for the same number of connection »It also has the advantage that the support rail with a simpler Tool can be produced and that no space on the circuit board for laterally emerging leads must be kept free.

Claims (4)

Invention sanction _ 1. Detachable multi-pole electrical connection device for small electronic assemblies - in particular printed circuit boards - consisting of a contact piece attached to the printed circuit board and a connected to the lead by soldering or Wicke! Connection contact part for each compound * each together form a simple electrical connector and wherein all contact parts are held in an insulating support rail, characterized in that each contact part (19) and each contact piece (2; 5; 6j7) additionally has a square bar (12; 22) for a winding connection, that the two square bars ( 12; 22) of associated contact parts (19) and contact pieces (2; 5; 6; 7) in the inserted state after termination. of tests for increasing the reliability in each case by a piece of wire (27) are releasably connected by means of two known winding connections, wherein the piece of wire (27) between the square bars (12; 22) for additional support of the support rail (14) on the circuit board (1) as close to the surface of the support rail (14) and that in the support rail (14) brackets for fixing the insulated leads (13) are present. Connection device according to item 1, characterized in that receiving bores (25) are located in the carrier rail (14) as holders for fastening the connection lines (13) with insulation. 3 · Connecting device according to item 1, characterized in that there are grooves in the carrier rail (14) as holders for fixing the connecting lines (13) with insulation. · 4 * connecting device according to item 1, characterized in that on the contact pieces (2; 5; 6; 7) means for guiding and centering (11) are present and the support rail (14) also means for guiding and centering on the contact pieces (2 ; 5; 6; 7)>