EP0047469B1 - Contact insertable in a metallised aperture in a printed-circuit board and method of inserting this contact - Google Patents

Contact insertable in a metallised aperture in a printed-circuit board and method of inserting this contact Download PDF

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Publication number
EP0047469B1
EP0047469B1 EP81106821A EP81106821A EP0047469B1 EP 0047469 B1 EP0047469 B1 EP 0047469B1 EP 81106821 A EP81106821 A EP 81106821A EP 81106821 A EP81106821 A EP 81106821A EP 0047469 B1 EP0047469 B1 EP 0047469B1
Authority
EP
European Patent Office
Prior art keywords
contact
aperture
median part
hole
helical structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81106821A
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German (de)
French (fr)
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EP0047469A3 (en
EP0047469A2 (en
Inventor
Harry Züst
Sigi Bürgi
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to AT81106821T priority Critical patent/ATE16660T1/en
Publication of EP0047469A2 publication Critical patent/EP0047469A2/en
Publication of EP0047469A3 publication Critical patent/EP0047469A3/en
Application granted granted Critical
Publication of EP0047469B1 publication Critical patent/EP0047469B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/51—Fixed connections for rigid printed circuits or like structures
    • H01R12/55—Fixed connections for rigid printed circuits or like structures characterised by the terminals
    • H01R12/58—Fixed connections for rigid printed circuits or like structures characterised by the terminals terminals for insertion into holes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49147—Assembling terminal to base
    • Y10T29/49151—Assembling terminal to base by deforming or shaping
    • Y10T29/49153—Assembling terminal to base by deforming or shaping with shaping or forcing terminal into base aperture

Definitions

  • the present invention relates to a contact insertable into a metallized hole of a printed circuit board, as well as a method of inserting this contact into the metallized hole.
  • Contacts that can be inserted by force into the metallized holes of a printed circuit board are widely used today for making solderless connections. They generally have a first end intended to pass through the hole and protrude beyond one of the faces of the card when the contact is in the insertion position, and a second end intended to protrude beyond the other side of the card. These two ends are connected by a middle part whose function is to simultaneously ensure the electrical connection of the contact with the metallized interior surface of the hole, and its mechanical retention in the hole.
  • the invention relates more particularly to the middle part of these contacts, whose configurations known up to now can be classified according to two distinct groups.
  • a certain number of contacts have a prismatic, non-deformable middle part, with rectangular or square section.
  • the edges of the middle part which extend parallel to the longitudinal axis of the contact or to its direction of insertion into the hole, become embedded in the wall of the covering. inside the hole, thus forming gas-tight connections which slow down corrosion phenomena at the level of the contact surfaces.
  • these contacts have a number of disadvantages.
  • the large forces which develop in the axial direction can cause the tearing of the internal coating, or of the intermediate conductive layers in the case of the use of circuits. multilayer.
  • the axial retention of the contact which is effected only by friction of the contact on the coating, will be poor and may still deteriorate under the action of mechanical stresses ( vibrations, axial forces exerted on either end of the contact) or thermal. It can therefore be seen that the use of this type of contact implies compliance with very strict dimensional tolerances on the opening of the printed circuit, which are difficult to obtain by electroplating techniques.
  • the object of the invention is to provide an insertable contact which ensures both excellent mechanical strength and very satisfactory gas tightness and which does not have any of the disadvantages of known contacts while allowing a relaxation of tolerances. dimensions attached to the metallized hole of the printed circuit board.
  • the contact comprises a first end 1, of generally square section, intended to project beyond one of the faces of a printed circuit board so that it can receive an electric wire secured by means of a coiled connection.
  • the second end 2 not shown in the drawing is intended to project from the other face of the printed card and facilitate the connection of a secondary printed card, an electric wire or any other device.
  • the ends 1 and 2 are connected by a middle part 3 which has a helical structure.
  • the section of the middle part 3 is polygonal, preferably rectangular (FIG. 5) or square, and its vertices define the edges 4 of the helical structure.
  • the angle of rotation of the propeller is preferably 90 °, that is to say that the pitch of the propeller corresponds to the length of the middle part.
  • FIG. 4 represents the contact in the insertion position in a hole 5 of a printed circuit board 6, internally covered with a conductive coating 7.
  • a shoulder 8 having at least two flat surfaces 9, 10 perpendicular to the axis longitudinal contact is provided at the junction of the middle part 3 and the second end 2, to bear against the upper face of the printed circuit in the contact insertion position.
  • the contact is best implemented by simply exerting on its second end 2 a longitudinal thrust towards its end 1, and maintaining the free contact in rotation during at least the phase of penetration of the middle part into the hole. The contact therefore penetrates by turning into the wall of the coating 7.
  • the surfaces 9 and 10 then make it possible to fix the axial position and consequently the angular orientation of the contact in the insertion position.
  • these same surfaces 9 and 10 allow the forces applied to the end 1 to be transferred directly to the upper face of the card 6 during a connection operation by winding, in particular if the pitch of the helical structure is of the type on the left, while the winding connection is generally made clockwise.
  • a groove 11 is produced at the junction of the surfaces 9, 10 and the central part 3 to avoid any positioning defect caused by irregularities in the covering 7 at the entrance to the hole 5.
  • the length of the middle part 3 corresponds to the greatest depth of the holes capable of receiving it.
  • the length of the diagonals of the section of this middle part must be slightly greater than the average diameter of the opening defined by the walls of the covering 7.
  • Figure 6 shows by way of example a series of contacts during manufacture.
  • the cutting, bending and forming operations are carried out using a metal strip 12, for example in phosphor-bronze or tin-bronze, the individual contacts of which may be separated along a line X only by the end user of the contacts, before their insertion into the printed circuit boards.
  • the contacts shown in this figure, like that of Figure 7, have a second end 2 forming an elastic fork 13 provided for the connection of printed cards for example.
  • the contact of Figure 8 has a second end also forming a connection terminal by winding, for example to make a connector for flat cables. The coating of the different zones of these contacts can be obtained by the usual techniques.
  • the manufacturing operations advantageously provide for a step during which a twist of 90 ° is applied to one of the ends of the contact relative to the other, around the longitudinal axis contact, so as to give the middle part the desired helical configuration.

Landscapes

  • Coupling Device And Connection With Printed Circuit (AREA)
  • Multi-Conductor Connections (AREA)
  • Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)

Abstract

Contact insertable in a metallized hole of a printed circuit card containing two ends (1, 2) designed to project on both sides of the card in position of insertion of the contact and to facilitate the electric connection of any devices. The contact includes a median part (3) joining the ends (1, 2) which assures the electrical connection of the contact with the, metallized interior surface of the hole and at the same time its mechanical retention in the hole. The median part (3) comprises a spiral structure of a rectangular section, the verticles of which define the edges (4) of that spiral structure.

Description

La présente invention concerne un contact insérable dans un trou métallisé d'une carte de circuit imprimé, ainsi qu'un procédé d'insertion de ce contact dans le trou métallisé.The present invention relates to a contact insertable into a metallized hole of a printed circuit board, as well as a method of inserting this contact into the metallized hole.

Les contacts insérables à force dans les trous métallisés d'une carte de circuit imprimé sont largement utilisés à l'heure actuelle pour réaliser des connexions sans soudure. Ils comportent généralement une première extrémité prévue pour passer au travers du trou et faire saillie au-delà de l'une des faces de la carte lorsque le contact est en position d'insertion, et une deuxième extrémité prévue pour faire saillie au-delà de l'autre face de la carte. Ces deux extrémités sont raccordées par une partie médiane dont la fonction est d'assurer simultanément le raccordement électrique du contact avec la surface intérieure métallisée du trou, et sa retenue mécanique dans le trou.Contacts that can be inserted by force into the metallized holes of a printed circuit board are widely used today for making solderless connections. They generally have a first end intended to pass through the hole and protrude beyond one of the faces of the card when the contact is in the insertion position, and a second end intended to protrude beyond the other side of the card. These two ends are connected by a middle part whose function is to simultaneously ensure the electrical connection of the contact with the metallized interior surface of the hole, and its mechanical retention in the hole.

L'invention se rapporte plus particulièrement à la partie médiane de ces contacts, dont les configurations connues jusqu'ici peuvent être classées selon deux groupes distincts.The invention relates more particularly to the middle part of these contacts, whose configurations known up to now can be classified according to two distinct groups.

D'une part, un certain nombre de contacts présentent une partie médiane prismatique, indéformable, à section rectangulaire ou carrée. Lors de l'insertion d'un tel contact, les arêtes de la partie médiane, qui s'étendent parallèlement à l'axe longitudinal du contact ou à sa direction d'insertion dans le trou, viennent s'incruster dans la paroi du revêtement intérieur du trou, formant ainsi des liaisons étanches aux gaz qui freinent les phénomènes de corrosion au niveau des surfaces de contact.On the one hand, a certain number of contacts have a prismatic, non-deformable middle part, with rectangular or square section. When inserting such a contact, the edges of the middle part, which extend parallel to the longitudinal axis of the contact or to its direction of insertion into the hole, become embedded in the wall of the covering. inside the hole, thus forming gas-tight connections which slow down corrosion phenomena at the level of the contact surfaces.

Ces contacts présentent toutefois un certain nombre de désavantages. En particulier, lors de leur insertion dans une ouverture dont les dimensions sont trop faibles, les forces importantes qui se développent dans la direction axiale peuvent provoquer l'arrachement du revêtement intérieur, ou des couches conductrices intermédiaires dans le cas de l'utilisation de circuits multicouches. A l'inverse, si les dimensions de l'ouverture sont trop grandes, la retenue axiale du contact qui ne s'effectue que par frottement du contact sur le revêtement sera mauvaise et risquera encore de se détériorer sous l'action de sollicitations mécaniques (vibrations, efforts axiaux exercés sur l'une ou l'autre extrémité du contact) ou thermiques. On voit donc que l'utilisation de ce type de contacts implique le respect de tolérances dimensionnelles très strictes sur l'ouverture du circuit imprimé, qui sont délicates à obtenir par les techniques de galvanoplastie. On notera en particulier que dans le cas d'ouvertures de section non parfaitement ronde, un même contact sera plus ou moins bien retenu, selon que les diagonales de sa section correspondent à un diamètre plus ou moins grand de l'ouverture mesuré dans la direction de ces diagonales. En outre, les efforts radiaux exercés par la partie médiane sur le revêtement intérieur s'exercent selon deux directions diagonales et cette répartition irrégulière peut conduire à la fissuration du revêtement.However, these contacts have a number of disadvantages. In particular, when they are inserted into an opening whose dimensions are too small, the large forces which develop in the axial direction can cause the tearing of the internal coating, or of the intermediate conductive layers in the case of the use of circuits. multilayer. Conversely, if the dimensions of the opening are too large, the axial retention of the contact, which is effected only by friction of the contact on the coating, will be poor and may still deteriorate under the action of mechanical stresses ( vibrations, axial forces exerted on either end of the contact) or thermal. It can therefore be seen that the use of this type of contact implies compliance with very strict dimensional tolerances on the opening of the printed circuit, which are difficult to obtain by electroplating techniques. It will be noted in particular that in the case of openings of section which are not perfectly round, the same contact will be more or less well retained, depending on whether the diagonals of its section correspond to a more or less large diameter of the opening measured in the direction of these diagonals. In addition, the radial forces exerted by the middle part on the interior coating are exerted in two diagonal directions and this irregular distribution can lead to cracking of the coating.

Il existe d'autre part des contacts présentant une partie médiane déformable élastiquement dans une direction radiale, ce qui permet en théorie d'alléger les tolérances dimensionnelles des trous revêtus intérieurement qui doivent les recevoir. Toutefois, l'étanchéité aux gaz des surfaces de contact n'est réalisée au contraire qu'en respectant des conditions de tolérances et de mise en oeuvre absolument optimales. Il faut noter également que la surface de contact entre la partie médiane et la paroi du revêtement ne se fait jamais sur toute la hauteur de cette partie médiane, ce qui peut conduire à une retenue mécanique instable du contact. Enfin, les efforts axiaux mais aussi de rotation appliqués aux extrémités du contact ne peuvent être absorbés que de façon imparfaite par effet de frottement contre la paroi du revêtement.On the other hand, there are contacts having a middle part which is elastically deformable in a radial direction, which in theory makes it possible to reduce the dimensional tolerances of the holes coated on the inside which are to receive them. However, the gas-tightness of the contact surfaces is only achieved on the contrary by respecting absolutely optimal conditions of tolerances and implementation. It should also be noted that the contact surface between the middle part and the wall of the covering is never made over the entire height of this middle part, which can lead to unstable mechanical retention of the contact. Finally, the axial but also rotational forces applied to the ends of the contact can only be absorbed imperfectly by the effect of friction against the wall of the coating.

Il est également connu de retenir mécaniquement des contacts dans des trous non métallisés, prévus dans des barres de contact relativement épaisses en donnant à une partie médiane des contacts une structure hélicoïdale (US-A-3731 261It is also known to mechanically retain contacts in non-metallized holes, provided in relatively thick contact bars by giving a central part of the contacts a helical structure (US-A-3731 261

C'est pourquoi l'objet de l'invention est de proposer un contact insérable qui assure à la fois une excellente tenue mécanique et une étanchéité aux gaz très satisfaisante et qui ne présente aucun des désavantages des contacts connus tout en autorisant un relâchement des tolérances dimensionnelles attachées à la réalisation du trou métallisé de la carte de circuit imprimé.This is why the object of the invention is to provide an insertable contact which ensures both excellent mechanical strength and very satisfactory gas tightness and which does not have any of the disadvantages of known contacts while allowing a relaxation of tolerances. dimensions attached to the metallized hole of the printed circuit board.

Cet objet, et d'autres encore qui apparaîtront à la lecture de la description suivante, sont réalisés selon l'invention en prévoyant de conférer à la partie médiane du contact une structure hélicoïdale. Selon un mode de réalisation particulièrement avantageux tant du point de vue de la fabrication du contact que de celui de sa mise en oeuvre, la partie médiane présente une section rectangulaire, les sommets de cette section définissant les arêtes d'une structure hélicoïdale dont l'angle de rotation est de 90°. De préférence, le contact est inséré dans le trou métallisé en exerçant sur sa deuxième extrémité une poussée longitudinale dans la direction de là première, le contact étant maintenu libre en rotation pendant au moins la phase de pénétration de la partie médiane dans le trou. Dans ces conditions, le contact pénétrera le matériau du revêtement du trou selon une trajectoire en hélice, et se retrouvera dans une position d'insertion décalée de 90° par rapport à sa position initiale. Parmi les nombreux avantages de cette solution, on peut citer les suivants :

  • Ce contact est parfaitement guidé et maintenu axialement du fait que les points de contact sont répartis sur tout le pourtour de la paroi intérieure du revêtement, et cela sur toute sa hauteur ; cette caractéristique garantit un ancrage sûr du contact à l'encontre de sollicitations en flexion exercées sur l'une ou l'autre extrémité ;
  • la qualité du contact électrique et la retenue de la pièce sont affectées dans une moindre mesure par les irrégularités du trou et des tolérances dimensionnelles moins serrées, car elles ne dépendent plus comme antérieurement de la précision dimensionnelle du trou dans deux seules directions ;
  • les tensions mécaniques dans le revêtement intérieur du trou sont également réparties sur tout le pourtour. En raison de la forme sinusoïdale des arêtes en projection radiale, les efforts radiaux peuvent être absorbés par le matériau légèrement élastique sans que les propriétés électriques ou mécaniques du contact soient remises en cause ;
  • la surface de contact correspondant au nombre de points électriquement actifs et formant une liaison étanche est fortement accrue du fait de la structure hélicoïdale
  • la blessure du revêtement intérieur du trou est plus légère, et évite donc sa fissuration ;
  • les forces axiales exercées sur la première extrémité lors de la formation d'une connexion enroulée ou du retrait d'un enroulement sont absorbées par effet de frottement, mais aussi de verrouillage de forme ;
  • en prévoyant une structure hélicoïdale à pas à gauche, les forces axiales et les forces de torsion apparaissant lors de la formation d'une connexion enroulée qui s'effectue normalement selon le sens horaire sont partiellement contrecarrées et peuvent être reprises par la surface de la face opposée de la carte de circuit imprimé au moyen d'épaulements prévus sur le contact ; cette disposition élimine en grande partie les effets d'usure du trou ou d'autres effets agissant défavorablement sur la qualité de la liaison.
This object, and still others which will appear on reading the following description, are produced according to the invention by providing the central part of the contact with a helical structure. According to a particularly advantageous embodiment both from the point of view of the manufacture of the contact and that of its implementation, the middle part has a rectangular section, the vertices of this section defining the edges of a helical structure, the angle of rotation is 90 °. Preferably, the contact is inserted into the metallized hole by exerting on its second end a longitudinal thrust in the direction of the first, the contact being kept free in rotation during at least the phase of penetration of the middle part in the hole. Under these conditions, the contact will penetrate the material of the covering of the hole according to a helical trajectory, and will be in an insertion position offset by 90 ° relative to its initial position. Among the many advantages of this solution, we can cite the following:
  • This contact is perfectly guided and maintained axially because the contact points are distributed over the entire periphery of the interior wall of the covering, and this over its entire height; this characteristic guarantees a secure anchoring of the contact against bending stresses exerted on either end;
  • the quality of the electrical contact and the retention of the part are affected to a lesser extent by the irregularities of the hole and less tight dimensional tolerances, because they no longer depend as before on the dimensional accuracy of the hole in only two directions;
  • the mechanical stresses in the inner lining of the hole are also distributed around the entire periphery. Due to the sinusoidal shape of the edges in radial projection, the radial forces can be absorbed by the slightly elastic material without the electrical or mechanical properties of the contact being called into question;
  • the contact surface corresponding to the number of electrically active points and forming a tight connection is greatly increased due to the helical structure
  • the wound on the inner lining of the hole is lighter, and therefore prevents it from cracking;
  • the axial forces exerted on the first end during the formation of a wound connection or the withdrawal of a winding are absorbed by the friction effect, but also by shape locking;
  • by providing a left-hand helical structure, the axial forces and the torsional forces which appear during the formation of a coiled connection which normally takes place clockwise are partially counteracted and can be taken up by the surface of the face opposite of the printed circuit board by means of shoulders provided on the contact; this provision largely eliminates the effects of wear of the hole or other effects adversely affecting the quality of the connection.

L'invention sera bien comprise à la lecture de la description suivante faite en relation avec les dessins joints, parmi lesquels :

  • la figure 1 est une vue partielle en perspective d'un contact insérable selon l'invention ;
  • la figure 2 est une vue en élévation du contact de la figure 1 selon les flèches II-II de cette figure ;
  • la figure 3 est une vue en élévation du contact des figures 1 et 2 selon les flèches III-III de la figure 1 ;
  • la figure 4 est une vue en coupe d'un contact selon l'invention après insertion dans un trou d'une carte de circuit imprimé ;
  • la figure 5 est une vue en coupe selon la ligne V-V du contact de la figure 4 ;
  • la figure 6 est une vue en élévation d'une série de contacts selon l'invention en cours de fabrication
  • la figure 7 représente une coupe selon la ligne VII-VII d'un contact de la figure 6 ; et
  • la figure 8 représente un autre mode de réalisation d'un contact selon l'invention.
The invention will be clearly understood on reading the following description made in relation to the accompanying drawings, among which:
  • Figure 1 is a partial perspective view of an insertable contact according to the invention;
  • Figure 2 is an elevational view of the contact of Figure 1 according to arrows II-II of this figure;
  • Figure 3 is an elevational view of the contact of Figures 1 and 2 according to arrows III-III of Figure 1;
  • Figure 4 is a sectional view of a contact according to the invention after insertion into a hole of a printed circuit board;
  • Figure 5 is a sectional view along line VV of the contact of Figure 4;
  • Figure 6 is an elevational view of a series of contacts according to the invention during manufacture
  • Figure 7 shows a section along line VII-VII of a contact of Figure 6; and
  • FIG. 8 represents another embodiment of a contact according to the invention.

Comme on le voit au mieux sur les figures 1 à 3 le contact selon un mode de réalisation particulier de l'invention comporte une première extrémité 1, de section généralement carrée, prévue pour faire saillie au-delà de l'une des faces d'une carte de circuit imprimé de façon à pouvoir recevoir un fil électrique assujetti au moyen d'une connexion enroulée. La deuxième extrémité 2 non représentée sur le dessin est prévu pour faire saillie sur l'autre face de la carte imprimée et faciliter la connexion d'une carte imprimée secondaire, d'un fil électrique ou de tout autre dispositif. Les extrémités 1 et 2 sont raccordées par une partie médiane 3 qui présente une structure hélicoïdale. La section de la partie médiane 3 est polygonale, de préférence rectangulaire (figure 5) ou carrée, et ses sommets définissent les arêtes 4 de la structure hélicoïdale. Dans le cas d'une section rectangulaire ou carrée, l'angle de rotation de l'hélice est de préférence de 90°, c'est-à-dire que le pas de l'hélice correspond à la longueur de la partie médiane.As best seen in Figures 1 to 3, the contact according to a particular embodiment of the invention comprises a first end 1, of generally square section, intended to project beyond one of the faces of a printed circuit board so that it can receive an electric wire secured by means of a coiled connection. The second end 2 not shown in the drawing is intended to project from the other face of the printed card and facilitate the connection of a secondary printed card, an electric wire or any other device. The ends 1 and 2 are connected by a middle part 3 which has a helical structure. The section of the middle part 3 is polygonal, preferably rectangular (FIG. 5) or square, and its vertices define the edges 4 of the helical structure. In the case of a rectangular or square section, the angle of rotation of the propeller is preferably 90 °, that is to say that the pitch of the propeller corresponds to the length of the middle part.

La figure 4 représente le contact en position d'insertion dans un trou 5 d'une carte 6 de circuit imprimé, recouvert intérieurement d'un revêtement conducteur 7. Un épaulement 8 présentant au moins deux surfaces planes 9, 10 perpendiculaires à l'axe longitudinal du contact est prévu à la jonction de la partie médiane 3 et de la deuxième extrémité 2, pour venir s'appuyer contre la face supérieure du circuit imprimé en position d'insertion du contact. Le contact est au mieux mis en place en exerçant simplement sur sa deuxième extrémité 2 une poussée longitudinale en direction de son extrémité 1, et en maintenant le contact libre en rotation pendant au moins la phase de pénétration de la partie médiane dans le trou. Le contact pénètre donc en tournant dans la paroi du revêtement 7. Les surfaces 9 et 10 permettent alors de fixer la position axiale et par conséquent l'orientation angulaire du contact en position d'insertion. En outre, ces mêmes surfaces 9 et 10 permettent de reporter directement sur la face supérieure de la carte 6 les efforts appliqués à l'extrémité 1 lors d'une opération de connexion par enroulement, notamment si le pas de la structure hélicoïdale est du type à gauche, alors que la connexion par enroulement s'effectue généralement dans le sens horaire. Une gorge 11 est réalisée à la jonction des surfaces 9, 10 et de la partie médiane 3 pour éviter tout défaut de positionnement provoqué par des irrégularités du revêtement 7 à l'entrée du trou 5. Pour garantir un raccordement correct d'un même contact dans des trous de profondeurs diverses, notamment pour l'utilisation de circuits multicouches, il suffira de prévoir que la longueur de la partie médiane 3 correspond à la plus grande profondeur des trous susceptibles de la recevoir. Bien entendu, la longueur des diagonales de la section de cette partie médiane doit être légèrement plus grande que le diamètre moyen de l'ouverture définie par les parois du revêtement 7.FIG. 4 represents the contact in the insertion position in a hole 5 of a printed circuit board 6, internally covered with a conductive coating 7. A shoulder 8 having at least two flat surfaces 9, 10 perpendicular to the axis longitudinal contact is provided at the junction of the middle part 3 and the second end 2, to bear against the upper face of the printed circuit in the contact insertion position. The contact is best implemented by simply exerting on its second end 2 a longitudinal thrust towards its end 1, and maintaining the free contact in rotation during at least the phase of penetration of the middle part into the hole. The contact therefore penetrates by turning into the wall of the coating 7. The surfaces 9 and 10 then make it possible to fix the axial position and consequently the angular orientation of the contact in the insertion position. In addition, these same surfaces 9 and 10 allow the forces applied to the end 1 to be transferred directly to the upper face of the card 6 during a connection operation by winding, in particular if the pitch of the helical structure is of the type on the left, while the winding connection is generally made clockwise. A groove 11 is produced at the junction of the surfaces 9, 10 and the central part 3 to avoid any positioning defect caused by irregularities in the covering 7 at the entrance to the hole 5. To guarantee correct connection of the same contact in holes of various depths, in particular for the use of multilayer circuits, it will suffice to provide that the length of the middle part 3 corresponds to the greatest depth of the holes capable of receiving it. Of course, the length of the diagonals of the section of this middle part must be slightly greater than the average diameter of the opening defined by the walls of the covering 7.

La figure 6 montre à titre d'exemple une série de contacts en cours de fabrication. Les opérations de découpage, cambrage, formage sont réalisées à partir d'une bande métallique 12, par exemple en phosphore-bronze ou étain-bronze, dont les contacts individuels peuvent n'être séparés selon une ligne X que par l'utilisateur final des contacts, avant leur insertion dans les cartes de circuits imprimés. Les contacts représentés sur cette figure, comme celui de la figure 7, comportent une deuxième extrémité 2 formant une fourchette élastique 13 prévue pour le raccordement de cartes imprimées par exemple. Le contact de la figure 8 comporte une deuxième extrémité formant elle aussi une borne de connexion par enroulement, par exemple pour réaliser un connecteur pour câbles plats. Le revêtement des différentes zones de ces contacts peut être obtenu par les techniques habituelles.Figure 6 shows by way of example a series of contacts during manufacture. The cutting, bending and forming operations are carried out using a metal strip 12, for example in phosphor-bronze or tin-bronze, the individual contacts of which may be separated along a line X only by the end user of the contacts, before their insertion into the printed circuit boards. The contacts shown in this figure, like that of Figure 7, have a second end 2 forming an elastic fork 13 provided for the connection of printed cards for example. The contact of Figure 8 has a second end also forming a connection terminal by winding, for example to make a connector for flat cables. The coating of the different zones of these contacts can be obtained by the usual techniques.

Pour la réalisation de la partie médiane 3, les opérations de fabrication prévoient de façon avantageuse une étape au cours de laquelle une torsion de 90° est appliquée à l'une des extrémités du contact relativement à l'autre, autour de l'axe longitudinal du contact, de manière à conférer à la partie médiane la configuration hélicoïdale voulue.For the production of the middle part 3, the manufacturing operations advantageously provide for a step during which a twist of 90 ° is applied to one of the ends of the contact relative to the other, around the longitudinal axis contact, so as to give the middle part the desired helical configuration.

Bien qu'elle ait été décrite en liaison avec un mode de réalisation particulier de la partie médiane, l'invention ne s'y trouve nullement limitée.Although it has been described in connection with a particular embodiment of the middle part, the invention is in no way limited thereto.

D'autres solutions conformes à l'invention quoique moins avantageuse pourraient être envisagées, tant pour les caractéristiques angulaires de la structure hélicoïdale que pour la forme de sa section.Other solutions according to the invention, although less advantageous, could be envisaged, both for the angular characteristics of the helical structure and for the shape of its section.

Claims (9)

1. Contact insertable into a metallized aperture (5) of a printed circuitboard (6) comprising
a first end (1) for passing through the aperture (5) and projecting beyond one of the faces (9) of board (6) when the contact is in the insertion position ;
a second end (2) for projecting beyond the other face of the board (6) when the contact is in the insertion position ; and
a median part (3) connecting the first and second ends for simultaneously ensuring the dectrical connection of contact (4) to the inner metallized surface (7) of the aperture and its mechanical retention therein,

characterized in that the median part has a helical structure.
2. Contact according to claim 1, characterized in that perpendicularly to the longitudinal axis of the contact, median part (3) has a polygonal section, whose tops (4) define the edges of the helical structure.
3. Contact according to claim 2, characterized in that the section of median part (3) is rectangular.
4. Contact according to claim 3, characterized in that the rotation angle of the helical structure is 90°.
5. Contact according to any one of the preceding claims, characterized in that the helical structure has a left-hand action.
6. Contact according to any one of the preceding claims, characterized in that the first end (1) forms a connection terminal by winding.
7. Contact according to any one of the preceding claims, characterized in that a shoulder (8) having planar surfaces (9, 10) perpendicular to the longitudinal axis of the contact is provided at the junction of the median part (3) and the second end (2) for bearing against the printed circuitboard (6) when the contact is in the insertion position.
8. Contact according to claim 7, characterized in that the planar surfaces (9, 10) of the shoulder (8) are connected to the contiguous surfaces of the median part (3) via a groove (11).
9. Method for inserting a contact according to any one of the claims 1 to 8 into an aperture of a printed circuitboard, characterized in that the first end of the contact is introduced into the aperture and longitudinal pressure in the direction of the first end is exerted on the second end, the contact being maintained in free rotation at least during the penetration phase of the median part into the aperture.
EP81106821A 1980-09-05 1981-09-01 Contact insertable in a metallised aperture in a printed-circuit board and method of inserting this contact Expired EP0047469B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81106821T ATE16660T1 (en) 1980-09-05 1981-09-01 INSERT CONTACT FOR A METALLIZED HOLE OF A PRINTED CIRCUIT BOARD AND METHOD OF INSERTING SUCH CONTACT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6679/80 1980-09-05
CH667980A CH642488A5 (en) 1980-09-05 1980-09-05 CONTACT INSERTABLE INTO A METAL HOLE OF A PRINTED CIRCUIT BOARD, MANUFACTURING METHOD AND USE OF THIS CONTACT.

Publications (3)

Publication Number Publication Date
EP0047469A2 EP0047469A2 (en) 1982-03-17
EP0047469A3 EP0047469A3 (en) 1982-03-24
EP0047469B1 true EP0047469B1 (en) 1985-11-21

Family

ID=4313323

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106821A Expired EP0047469B1 (en) 1980-09-05 1981-09-01 Contact insertable in a metallised aperture in a printed-circuit board and method of inserting this contact

Country Status (7)

Country Link
US (1) US4557539A (en)
EP (1) EP0047469B1 (en)
JP (1) JPS57118697A (en)
AT (1) ATE16660T1 (en)
CA (1) CA1189924A (en)
CH (1) CH642488A5 (en)
DE (1) DE3173001D1 (en)

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US4878861A (en) * 1988-11-01 1989-11-07 Elfab Corporation Compliant electrical connector pin
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US6035529A (en) * 1997-11-25 2000-03-14 Micron Electronics, Inc. Header pin pre-loaded method
US6216338B1 (en) 1997-11-25 2001-04-17 Micron Electronics, Inc. Header pin pre-load apparatus
DE102004006533A1 (en) * 2004-02-11 2005-09-01 Conti Temic Microelectronic Gmbh Electrically conductive contact pin for pressing into an opening of a printed circuit board and electrical assembly with such a contact pin
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Also Published As

Publication number Publication date
EP0047469A3 (en) 1982-03-24
US4557539A (en) 1985-12-10
CH642488A5 (en) 1984-04-13
DE3173001D1 (en) 1986-01-02
JPS57118697A (en) 1982-07-23
ATE16660T1 (en) 1985-12-15
CA1189924A (en) 1985-07-02
EP0047469A2 (en) 1982-03-17

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