EP0327464B1 - Contact for a telephonic connector and its manufacturing process - Google Patents

Contact for a telephonic connector and its manufacturing process Download PDF

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Publication number
EP0327464B1
EP0327464B1 EP89400304A EP89400304A EP0327464B1 EP 0327464 B1 EP0327464 B1 EP 0327464B1 EP 89400304 A EP89400304 A EP 89400304A EP 89400304 A EP89400304 A EP 89400304A EP 0327464 B1 EP0327464 B1 EP 0327464B1
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EP
European Patent Office
Prior art keywords
contact
heads
slot
head
notch
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 - Lifetime
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EP89400304A
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German (de)
French (fr)
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EP0327464A1 (en
Inventor
Jean-Jacques Lacombe
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BOGA SA
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BOGA SA
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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
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
    • H01R4/2416—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
    • H01R4/2445—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives
    • H01R4/245—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives the additional means having two or more slotted flat portions
    • H01R4/2454—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members having additional means acting on the insulation or the wire, e.g. additional insulation penetrating means, strain relief means or wire cutting knives the additional means having two or more slotted flat portions forming a U-shape with slotted branches

Definitions

  • a very desirable type of contact comprises two contact elements intended to cooperate with two conductors, these two contact elements being electrically connected so that they are at the same potential and also being connected to a contact tail, of elastic type, allowing temporary contact with another analog contact tail or with a test device, inserted in the connector block. So there have already been made such contacts allowing the connection of two conductive wires and having a tail of "cut", that is to say allowing the formation of a temporary contact.
  • a first known type of contact comprises a flat head having two contact elements, each formed by a notch and a slot. These two contact elements are placed side by side on the head. This contact has drawbacks because the side by side arrangement of the two contact elements increases the width of the contact head, so that the connector blocks must have a large width, for a determined number of contacts.
  • European patent application No. 171,193 describes a contact having several pairs of contacts, more precisely two pairs of contacts connected to one another. This contact comprises, on either side of a common connecting part, two contact heads connected by a cheek. Each pair of contact heads is intended to fix a single thread. In addition, these contact heads are not of the insulation displacement type. This contact is intended for use in motor vehicles.
  • the invention relates to new contacts for connector blocks (cable heads and strips) which include two contact elements placed at the same potential, the two contact elements being produced in two contact heads cut from the same piece of wire. 'a flat material and being each formed by a single thickness of this flat material.
  • the two contact heads are spaced from each other and at least one of them has, on the side opposite its contact part, a tail which can flex elastically.
  • a support tongue secured to the other contact head defines a location for bending the tail so that the connecting cheek of the two contact elements is not subjected to excessive force.
  • the invention also relates to a insulation displacement contact element of the type which has a V-shaped notch and a slot, the widest part of the notch opening at one edge of the contact element and the slot extending the notch at its point ; according to the invention, this element is manufactured by implementing the preceding method according to the invention, and it comprises a substantially rectilinear slot such that the thickness of the material along the edges of the slot and in the vicinity thereof is less than the thickness of the rest of the contact element.
  • the projection carried by one of the contact heads protrudes sufficiently from the plane of this head so that it is normally in contact with the other head.
  • FIG. 1 represents a contact according to the invention.
  • This contact essentially comprises two contact heads 10, 12.
  • the head 10 is extended by a tail 30, and the two heads are joined by a cheek 26.
  • each of the two contact heads 10, 12 has a contact element 14.
  • Each contact element 14 has a V-shaped notch 16, opening at one end of the head, a slot 18 formed in the extension of the tip of the notch, and a hole 20 in which the slot 18 ends. It is noted in FIGS. 3 and 4 that the edges of the slot have a thickness that is thinner than the rest of the contact heads, because a thinned area 19 is formed at the location of the slot. This characteristic is described in more detail below with reference to the manufacturing process.
  • the two contact heads 10, 12 are connected to each other by a cheek 26 which is integral with the heads.
  • the cheek is formed by folding the blank shown in FIG. 2 or in FIG. 3 around folding lines 27 which are parallel to the longitudinal direction of the contact elements. Note that the cheek has a limited length so that the two contact elements work independently.
  • the contact head 10 extends rearward, that is to say on the side where the projection 28 is placed, by the shank 30 which has two contact projections 32, 34.
  • This tail when the contact is mounted in a block of connectors, is intended to flex in the direction of arrow 35 ( Figure 1).
  • the flexion would be localized at the end of the cheek 26, and more precisely at the connection of the cheek and the head 10 at the place where they are perpendicular, at the end of the play. These localized stresses could quickly cause cracking and then complete rupture of the head and cheek material.
  • the projection 28 postpones the location of the bending at a distance from the end of the cheek 26, so that the material works only in bending and not in shearing. In this way, the longevity of the contact is increased.
  • Figure 4 shows two possible characteristics, which are also shown in Figure 1 on a smaller scale.
  • the reference 36 designates a second possible projection intended to determine the spacing of the heads 10 and 12 during folding and to reduce the shear forces at the other end of the cheek, that is to say the closest to the contact elements.
  • this projection is not necessary because the contact elements of the contact heads are not normally subjected to significant forces perpendicular to their plane.
  • the projection 36 can be offset further towards the contact elements, so that it is placed beyond the end of the cheek. This end of the cheek can also be brought closer to the other end of the cheek, so that localized shear stresses are avoided.
  • FIG. 2 represents a blank which has been formed by cutting a single member from a flat material. This member has however undergone the cutting of a tongue intended to form the projection 28, the cutting of the notches of the contact elements and the punching of the holes 20.
  • the slots should be formed. These slots must be cut with a determined width, for example 0.25 mm. The slots can be formed directly between the notch 16 and the hole 20. However, it can be seen in convenient that the cutting tools of such a slot wear out quickly. It is therefore desirable that the thickness of the contact is reduced at the places where a slot must be cut.
  • the ends of the contacts are cut as indicated by the reference 62.
  • the cutting of the contact heads is finished, the following operations being, at the bottom of FIG. 5, the cutting of the tail, its folding, folding the head, then (in operations which are not illustrated in FIG. 5) folding the contact itself and separating it from the strip.
  • the stamping which reduces the thickness of the zone in which the slot must be formed is carried out before the formation of the notches.
  • the problem posed by the stress of the metal in the contact parts placed on either side of the notch does not pose the problem solved by the method described in the abovementioned British patent.
  • the elongated crushing area 19 has been shown on one side of the blank, this elongated area can be formed independently on either side.
  • the projection 28 formed by a cut tongue This tab therefore has a certain elasticity. However, it can also be a simple deformation of one head, facing the other head. Also shown is the projection 28 formed on the head which is not extended by a tail 30. However, the projection can be formed on the contact head which comprises the tail, as long as the flexion location of the tail is transferred beyond the cheek 26, on the side opposite to that which includes the contact elements, and that the formation of the projection does not create a zone of weakness in the material.
  • the two contact heads are in the form of such tails or connection tabs, it may be advantageous for the two tabs not to be superposed, that is to say are offset in a direction perpendicular to the cheek.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Description

L'invention concerne des contacts pour blocs de connecteurs, ainsi qu'un procédé de fabrication de tels contacts.The invention relates to contacts for connector blocks, as well as a method for manufacturing such contacts.

Plus précisément, l'invention concerne la réalisation de contacts pour blocs de connecteurs utilisés dans les répartiteurs téléphoniques. On sait qu'un répartiteur téléphonique constitue l'interface disposée entre un central téléphonique et les cables d'un réseau public ou privé. Un tel répartiteur comporte un bâti métallique supportant un premier type de blocs de connecteurs appelés "têtes de câbles" et un second type de blocs de connecteurs appelés "réglettes", reliés respectivement aux câbles du réseau et au central. Une paire de fils souples ayant chacun un conducteur, appelée "jarretière", est utilisée pour chaque connexion entre deux contacts associés d'une tête de câble et deux contacts associés d'une réglette.More specifically, the invention relates to the production of contacts for connector blocks used in telephone distributors. We know that a telephone distributor constitutes the interface arranged between a telephone exchange and the cables of a public or private network. Such a distributor comprises a metal frame supporting a first type of connector blocks called "cable heads" and a second type of connector blocks called "strips", connected respectively to the network cables and to the central office. A pair of flexible wires each having a conductor, called a "jumper", is used for each connection between two associated contacts of a cable head and two associated contacts of a strip.

Etant donné que le nombre de jarrètiéres d'un répartiteur téléphonique est très important puisqu'il est de l'ordre de plusieurs milliers dans les répartiteurs téléphoniques des centraux publics, il convient que les raccordements des jarretières aux têtes de câbles et aux réglettes soient faciles, rapides et sûrs.Since the number of jumpers of a telephone distributor is very large since it is of the order of several thousand in the telephone distributors of public exchanges, it is advisable that the connections of the jumpers to the heads of cables and the strips are easy , fast and safe.

On connaît déjà des contacts destinés à de tels blocs de connecteurs (têtes de câbles et réglettes) de type autodénudant, c'est-à-dire qui ne nécessitent pas un dénudage préalable de l'extrémité du conducteur isolé. Ces contacts comportent une encoche en V qui se prolonge par une fente. La largeur de la fente est un peu inférieure au diamètre du conducteur métallique d'un fil souple d'une jarretière. Lorsqu'un fil souple d'une jarretière est repoussé dans une encoche, les bords de celle-ci coupent l'isolant et, lorsque l'introduction se poursuit, les bords de la fente viennent serrer le conducteur métallique (cuivre) en assurant un bon contact électrique.Contacts are already known for such connector blocks (cable heads and strips) of the insulation displacement type, that is to say that do not require prior stripping of the end of the insulated conductor. These contacts have a V-shaped notch which is extended by a slot. The width of the slot is slightly less than the diameter of the metallic conductor of a flexible wire of a garter. When a flexible wire from a garter is pushed into a notch, the edges of this cut the insulation and, when the introduction continues, the edges of the slot tighten the metallic conductor (copper) ensuring a good electrical contact.

On a été amené à utiliser des contacts ayant des fonctions de plus en plus élaborées dans de tels blocs de connecteurs. Ainsi, un type de contact très souhaitable comporte deux éléments de contact destinés à coopérer avec deux conducteurs, ces deux éléments de contact étant reliés électriquement afin qu'ils soient à un même potentiel et étant aussi reliés à une queue de contact, de type élastique, permettant un contact temporaire avec une autre queue de contact analogue ou avec un organe de test, introduit dans le bloc de connecteurs. On a donc déjà réalisé de tels contacts permettant la connexion de deux fils conducteurs et ayant une queue de "coupure", c'est-à-dire permettant la formation d'un contact temporaire.We have been led to use contacts having increasingly sophisticated functions in such connector blocks. So a very desirable type of contact comprises two contact elements intended to cooperate with two conductors, these two contact elements being electrically connected so that they are at the same potential and also being connected to a contact tail, of elastic type, allowing temporary contact with another analog contact tail or with a test device, inserted in the connector block. So there have already been made such contacts allowing the connection of two conductive wires and having a tail of "cut", that is to say allowing the formation of a temporary contact.

Un premier type de contact connu comporte une tête plate ayant deux éléments de contact, formés chacun d'une encoche et d'une fente. Ces deux éléments de contacts sont placés côte à côte sur la tête. Ce contact présente des inconvénients car la disposition côte à côte des deux éléments de contact augmente la largeur de la tête du contact, si bien que les blocs de connecteurs doivent avoir une grande largeur, pour un nombre déterminé de contacts.A first known type of contact comprises a flat head having two contact elements, each formed by a notch and a slot. These two contact elements are placed side by side on the head. This contact has drawbacks because the side by side arrangement of the two contact elements increases the width of the contact head, so that the connector blocks must have a large width, for a determined number of contacts.

On connaît aussi des contacts autodénudants comprenant plusieurs éléments de contact et formés par pliage de bandes métalliques minces. Plus précisément, chaque élément de contact est formé par pliage d'une bande mince sur elle-même, les deux épaisseurs de bande étant serrées l'une contre l'autre et délimitant chacune une encoche en V, les deux encoches étant légèrement décalées afin qu'elles attaquent successivement l'isolant d'un fil introduit dans les encoches. Les éléments de contact sont espacés suivant la longueur de la bande qui est repliée sur elle-même, en direction transversale, les deux éléments de contact sont donc très éloignés et ils doivent être supportés l'un et l'autre dans le bloc de connecteurs.There are also known insulation displacement contacts comprising several contact elements and formed by folding thin metal strips. More precisely, each contact element is formed by folding a thin strip on itself, the two thicknesses of strip being tightened against each other and each delimiting a V-notch, the two notches being slightly offset so that they successively attack the insulation of a wire introduced into the notches. The contact elements are spaced along the length of the strip which is folded back on itself, in transverse direction, the two contact elements are therefore very far apart and they must be supported both in the connector block .

La demande de brevet européen n° 171 193 décrit un contact ayant plusieurs paires de contacts, plus précisément deux paires de contacts reliées l'une à l'autre. Ce contact comprend, de part et d'autre d'une partie commune de liaison, deux têtes de contact reliées par une joue. Chaque paire de têtes de contacts est destinée à fixer un seul fil. En outre, ces têtes de contact ne sont pas de type autodénudant. Ce contact est destiné à être utilisé dans les véhicules automobiles.European patent application No. 171,193 describes a contact having several pairs of contacts, more precisely two pairs of contacts connected to one another. This contact comprises, on either side of a common connecting part, two contact heads connected by a cheek. Each pair of contact heads is intended to fix a single thread. In addition, these contact heads are not of the insulation displacement type. This contact is intended for use in motor vehicles.

La demande de brevet britannique n° 2 129 716 décrit un procédé de fabrication de contact électrique autodénudant. Selon ce procédé, une encoche en V est découpée dans une partie de flan destinée à former une tête de contact, et une zone allongée partant de la pointe de l'encoche en V est soumise à un matriçage destiné à réduire son épaisseur. Ensuite, une fente est découpée dans la partie matricée. Ce document indique que le procédé est destiné à créer, dans les deux parties de contact placées de part et d'autre de l'encoche en V, une contrainte d'écartement. La fente doit être découpée dans la partie matricée par poinçonnage, avec un poinçon de section variant progressivement de manière que, après relaxation de la contrainte, les bords de la fente soient sensiblement parallèles.British patent application No. 2,129,716 describes a method of manufacturing an electrical insulation displacement contact. According to this method, a V-shaped notch is cut from a blank portion intended to form a contact head, and an elongated zone starting from the tip of the V-shaped notch is subjected to a die-cutting intended to reduce its thickness. Then, a slot is cut in the stamped part. This document indicates that the method is intended to create, in the two contact parts placed on either side of the V-shaped notch, a spacing constraint. The slit must be cut in the stamped part by punching, with a punch of section varying progressively so that, after relaxation of the stress, the edges of the slit are substantially parallel.

L'invention concerne de nouveaux contacts destinés à des blocs de connecteurs (têtes de câbles et réglettes) qui comprennent deux éléments de contact placés à un même potentiel, les deux éléments de contact étant réalisés dans deux têtes de contact découpées dans un même morceau d'un matériau plat et étant formés chacun par une seule épaisseur de ce matériau plat. Les deux têtes de contact sont distantes l'une de l'autre et l'une d'elles au moins comporte, du côté opposé à sa partie de contact, une queue qui peut fléchir élastiquement. Une languette d'appui solidaire de l'autre tête de contact délimite un emplacement de flexion de la queue afin que la joue de raccordement des deux éléments de contact ne subisse d'efforts excessifs.The invention relates to new contacts for connector blocks (cable heads and strips) which include two contact elements placed at the same potential, the two contact elements being produced in two contact heads cut from the same piece of wire. 'a flat material and being each formed by a single thickness of this flat material. The two contact heads are spaced from each other and at least one of them has, on the side opposite its contact part, a tail which can flex elastically. A support tongue secured to the other contact head defines a location for bending the tail so that the connecting cheek of the two contact elements is not subjected to excessive force.

Plus précisément, l'invention concerne un procédé de fabrication d'un élément de contact autodénudant du type qui comporte une encoche en V et une fente, la partie la plus large de l'encoche débouchant à un bord de l'élément de contact et la fente prolongeant l'encoche à sa pointe ; selon l'invention, le procédé comprend :

  • l'écrasement local d'une zone allongée d'un flan d'un matériau plat, afin que l'épaisseur du matériau soit réduite à l'emplacement prévu pour la fente et de part et d'autre de cet emplacement, puis
  • la découpe du flan afin qu'il forme une encoche en V dont la pointe est disposée vers l'intérieur du flan et pratiquement à une extrémité de la zone allongée, et
  • la découpe d'une fente dans la zone allongée d'épaisseur réduite, dans le prolongement de la pointe de l'encoche, en direction parallèle à l'axe longitudinal de l'élément de contact.
More specifically, the invention relates to a method of manufacturing a insulation displacement contact element of the type which comprises a V-notch and a slot, the widest part of the notch opening at one edge of the contact element and the slot extending the notch at its tip; according to the invention, the method comprises:
  • local crushing of an elongated area of a blank of flat material, so that the thickness of the material is reduced to the location provided for the slit and on either side of this location, then
  • cutting the blank so that it forms a V-shaped notch, the point of which is arranged towards the inside of the blank and practically at one end of the elongated zone, and
  • cutting a slot in the elongated zone of reduced thickness, in line with the tip of the notch, in a direction parallel to the longitudinal axis of the contact element.

Dans un mode de réalisation, le procédé comprend en outre la formation de deux éléments de contact dans deux têtes reliées par une joue, les éléments de contact étant parallèles l'un à l'autre, et le pliage du flan aux bords de la joue, en direction parallèle à la direction longitudinale des éléments de contact.In one embodiment, the method further comprises forming two contact elements in two heads connected by a cheek, the contact elements being parallel to each other, and folding the blank at the edges of the cheek , in direction parallel to the longitudinal direction of the contact elements.

Il est alors avantageux que le procédé comporte en outre la découpe d'une languette destinée à former une saillie, dans une tête de contact au moins, et la découpe d'une queue, dans l'autre tête de contact au moins.It is then advantageous that the method further comprises cutting a tongue intended to form a projection, in at least one contact head, and cutting a tail, in the other contact head at least.

L'invention concerne aussi un élément de contact autodénudant du type qui comporte une encoche en V et une fente , la partie la plus large de l'encoche débouchant à un bord de l'élément de contact et la fente prolongeant l'encoche à sa pointe ; selon l'invention, cet élément est fabriqué par mise en oeuvre du procédé précédent selon l'invention, et il comporte une fente sensiblement rectiligne telle que l'épaisseur du matériau le long des bords de la fente et à proximité de celle-ci est inférieure à l'épaisseur du reste de l'élément de contact.The invention also relates to a insulation displacement contact element of the type which has a V-shaped notch and a slot, the widest part of the notch opening at one edge of the contact element and the slot extending the notch at its point ; according to the invention, this element is manufactured by implementing the preceding method according to the invention, and it comprises a substantially rectilinear slot such that the thickness of the material along the edges of the slot and in the vicinity thereof is less than the thickness of the rest of the contact element.

L'invention concerne en outre l'application d'un tel élément à un contact pour bloc de connecteurs qui comporte deux éléments de contact selon le paragraphe précédent, qui sont formés dans deux têtes de contact disposées dans deux plans parallèles distincts, le contact étant formé d'un organe unique d'un matériau plat, replié suivant un axe parallèle à la direction longitudinale des têtes allongées de contact, le pliage formant une joue en direction sensiblement parallèle aux plans des têtes et parallèle à la direction longitudinale des éléments ; en outre, l'une au moins des têtes de contact comporte une saillie tournée vers l'autre tête de contact, cette saillie étant disposée à distance de la joue en direction perpendiculaire à la direction de pliage et étant placée au-delà de la joue du côté de celle-ci qui est opposé à celui qui porte l'élément de contact.The invention further relates to the application of such an element to a contact for a connector block which comprises two contact elements according to the preceding paragraph, which are formed in two contact heads arranged in two separate parallel planes, the contact being formed of a single member of a flat material, folded along an axis parallel to the longitudinal direction of the elongated contact heads, the folding forming a cheek in the direction substantially parallel to the planes of the heads and parallel to the longitudinal direction of the elements; in addition, at least one of the contact heads has a projection facing the other contact head, this projection being arranged at a distance from the cheek in a direction perpendicular to the folding direction and being placed beyond the cheek on the side thereof which is opposite to that which carries the contact element.

De préférence, la saillie portée par l'une des têtes de contact dépasse suffisamment du plan de cette tête pour qu'elle soit normalement au contact de l'autre tête.Preferably, the projection carried by one of the contact heads protrudes sufficiently from the plane of this head so that it is normally in contact with the other head.

Dans un mode de réalisation, l'une des têtes de contact est prolongée par une queue élastique.In one embodiment, one of the contact heads is extended by an elastic tail.

D'autres caractéristiques et avantages de l'invention ressortiront mieux de la description qui va suivre faite en référence au dessin annexé sur lequel :

  • la figure 1 est une élévation latérale d'un contact selon l'invention, à une échelle correspondant sensiblement au double de la dimension réelle ;
  • la figure 2 est une vue en plan d'un flan découpé utilisé pour la fabrication d'un contact analogue à celui de la figure 1, mais légèrement simplifié ;
  • la figure 3 est un agrandissement de la partie principale du flan de la figure 2 ;
  • la figure 4 est une coupe suivant la ligne 4-4 d'un contact réalisé à partir du flan des figures 2 et 3 ; et
  • la figure 5 est une vue en plan d'un flan, illustrant les étapes de la mise en oeuvre d'un procédé selon l'invention.
Other characteristics and advantages of the invention will emerge more clearly from the description which follows, given with reference to the appended drawing in which:
  • Figure 1 is a side elevation of a contact according to the invention, on a scale corresponding substantially to twice the actual dimension;
  • Figure 2 is a plan view of a cut blank used for making a contact similar to that of Figure 1, but slightly simplified;
  • Figure 3 is an enlargement of the main part of the blank of Figure 2;
  • Figure 4 is a section along line 4-4 of a contact made from the blank of Figures 2 and 3; and
  • FIG. 5 is a plan view of a blank, illustrating the steps of implementing a method according to the invention.

La figure 1 représente un contact selon l'invention. Ce contact comporte essentiellement deux têtes de contact 10, 12. La tête 10 est prolongée par une queue 30, et les deux têtes sont solidarisées par une joue 26.FIG. 1 represents a contact according to the invention. This contact essentially comprises two contact heads 10, 12. The head 10 is extended by a tail 30, and the two heads are joined by a cheek 26.

Comme l'indique plus précisément la figure 3, chacune des deux têtes 10, 12 de contact comporte un élément de contact 14. Chaque élément de contact 14 comporte une encoche 16 en V, débouchant à une extrémité de la tête, une fente 18 formée dans le prolongement de la pointe de l'encoche, et un trou 20 dans lequel se termine la fente 18. On note sur les figures 3 et 4 que les bords de la fente ont une épaisseur plus faible que le reste des têtes de contact, car une zone amincie 19 est formée à l'emplacement de la fente. Cette caractéristique est décrite plus en détail dans la suite en référence au procédé de fabrication.As indicated more precisely in FIG. 3, each of the two contact heads 10, 12 has a contact element 14. Each contact element 14 has a V-shaped notch 16, opening at one end of the head, a slot 18 formed in the extension of the tip of the notch, and a hole 20 in which the slot 18 ends. It is noted in FIGS. 3 and 4 that the edges of the slot have a thickness that is thinner than the rest of the contact heads, because a thinned area 19 is formed at the location of the slot. This characteristic is described in more detail below with reference to the manufacturing process.

On note sur le flan représenté sur la figure 3 que l'élément de contact de la tête 10 est décalé par rapport à celui de la tête 12. En effet, l'élément de contact de la tête 10 est destiné à être placé à distance de l'élément de contact de la tête 12, par pliage en S autour de deux lignes de pliage 24 (figure 3), de manière que les encoches 16, les fentes 18 et les trous 20 soient alignés en direction perpendiculaire aux têtes de contact, comme représenté clairement sur la figure 4. Cet espacement des deux éléments de contact est avantageux car il facilite l'introduction de deux fils séparés dans les deux éléments de contact séparés. Cependant, cet espacement est limité car plus les éléments de contact sont écartés et plus le bloc de connecteurs qui doit les contenir a une épaisseur importante.Note on the blank shown in Figure 3 that the contact element of the head 10 is offset from that of the head 12. Indeed, the contact element of the head 10 is intended to be placed at a distance of the contact element of the head 12, by S-folding around two fold lines 24 (FIG. 3), so that the notches 16, the slots 18 and the holes 20 are aligned in a direction perpendicular to the contact heads , as shown clearly in FIG. 4. This spacing of the two contact elements is advantageous because it facilitates the introduction of two separate wires into the two separate contact elements. However, this spacing is limited because the further apart the contact elements are, the greater the thickness of the connector block which must contain them.

Les deux têtes de contact 10, 12 sont reliées l'une à l'autre par une joue 26 qui est solidaire des têtes. La joue est formée par pliage du flan représenté sur la figure 2 ou sur la figure 3 autour de lignes 27 de pliage qui sont parallèles à la direction longitudinale des éléments de contact. On note que la joue a une longueur limitée afin que les deux éléments de contact travaillent de manière indépendante.The two contact heads 10, 12 are connected to each other by a cheek 26 which is integral with the heads. The cheek is formed by folding the blank shown in FIG. 2 or in FIG. 3 around folding lines 27 which are parallel to the longitudinal direction of the contact elements. Note that the cheek has a limited length so that the two contact elements work independently.

Selon une caractéristique de l'invention, la tête 12 de contact comporte une languette 28 déformée afin qu'elle constitue une saillie tournée vers l'autre tête et de préférence placée à son contact. Cette saillie est placée à distance de la joue 26 en direction perpendiculaire à la direction longitudinale des éléments de contact et aux lignes de pliage 27 constituant les bords de la joue (figure 3).According to a characteristic of the invention, the contact head 12 has a tongue 28 deformed so that it constitutes a projection facing the other head and preferably placed in contact with it. This projection is placed at a distance from the cheek 26 in a direction perpendicular to the longitudinal direction of the contact elements and to the fold lines 27 constituting the edges of the cheek (FIG. 3).

La tête de contact 10 se prolonge vers l'arrière, c'est-à-dire du côté où est placée la saillie 28, par la queue 30 qui comporte deux saillies 32, 34 de contact. Cette queue, lorsque le contact est monté dans un bloc de connecteurs, est destinée à fléchir dans le sens de la flèche 35 (figure 1). En l'absence de la saillie 28, la flexion serait localisée à l'extrémité de la joue 26, et plus précisément au raccord de la joue et de la tête 10 à l'endroit où elles sont perpendiculaires, à l'extrémité de la joue. Ces contraintes localisées pourraient provoquer rapidement une fissuration puis une rupture totale du matériau de la tête et de la joue. Selon l'invention, la saillie 28 reporte l'emplacement de la flexion à distance de l'extrémité de la joue 26, si bien que le matériau travaille uniquement à la flexion et non au cisaillement. De cette manière, la longévité du contact est accrue.The contact head 10 extends rearward, that is to say on the side where the projection 28 is placed, by the shank 30 which has two contact projections 32, 34. This tail, when the contact is mounted in a block of connectors, is intended to flex in the direction of arrow 35 (Figure 1). In the absence of the projection 28, the flexion would be localized at the end of the cheek 26, and more precisely at the connection of the cheek and the head 10 at the place where they are perpendicular, at the end of the play. These localized stresses could quickly cause cracking and then complete rupture of the head and cheek material. According to the invention, the projection 28 postpones the location of the bending at a distance from the end of the cheek 26, so that the material works only in bending and not in shearing. In this way, the longevity of the contact is increased.

La figure 4 représente deux caractéristiques éventuelles, qui sont aussi indiquées sur la figure 1 à plus petite échelle. Plus précisément, la référence 36 désigne une seconde saillie éventuelle destinée à déterminer l'espacement des têtes 10 et 12 lors du pliage et à réduire les efforts de cisaillement au niveau de l'autre extrémité de la joue, c'est-à-dire la plus proche des éléments de contact. En principe, cette saillie n'est pas nécessaire car les éléments de contact des têtes de contact ne sont pas normalement soumis à des forces importantes perpendiculairement à leur plan. Cependant, il s'agit d'une caractéristique avantageuse. Bien entendu, la saillie 36 peut être déportée plus loin vers les éléments de contact, afin qu'elle soit placée au-delà de l'extrémité de la joue. Cette extrémité de la joue peut d'ailleurs être rapprochée de l'autre extrémité de la joue, afin que les contraintes localisées de cisaillement soient évitées.Figure 4 shows two possible characteristics, which are also shown in Figure 1 on a smaller scale. More specifically, the reference 36 designates a second possible projection intended to determine the spacing of the heads 10 and 12 during folding and to reduce the shear forces at the other end of the cheek, that is to say the closest to the contact elements. In principle, this projection is not necessary because the contact elements of the contact heads are not normally subjected to significant forces perpendicular to their plane. However, this is an advantageous feature. Of course, the projection 36 can be offset further towards the contact elements, so that it is placed beyond the end of the cheek. This end of the cheek can also be brought closer to the other end of the cheek, so that localized shear stresses are avoided.

La seconde caractéristique est indiquée sur la figure 4 par la référence 38 qui désigne une saillie formée par déformation de la tête de contact 10 et destinée à permettre un blocage du contact à l'intérieur d'un corps de matière plastique moulée d'un bloc de connecteurs. Bien entendu, cet organe 38 de coopération avec un corps isolant peut avoir diverses configurations. Par exemple, cette saillie 38 peut être remplacée par une languette ou même par deux languettes ayant de préférence des sens opposés et formées sur l'une des têtes de contact ou sur les deux. Ces languettes sont alors tournées vers l'extérieur des têtes de contact, c'est-à-dire du côté opposé à la joue.The second characteristic is indicated in FIG. 4 by the reference 38 which designates a projection formed by deformation of the contact head 10 and intended to allow blocking of the contact inside a body of plastic material molded from a block connectors. Of course, this member 38 for cooperation with an insulating body can have various configurations. For example, this projection 38 can be replaced by a tongue or even by two tongues preferably having opposite directions and formed on one or both of the contact heads. These tabs are then turned towards the outside of the contact heads, that is to say on the side opposite the cheek.

On considère maintenant le procédé de fabrication du contact selon l'invention.We now consider the method of manufacturing the contact according to the invention.

La figure 2 représente un flan qui a été formé par découpe d'un organe unique d'un matériau plat. Cet organe a cependant subi la découpe d'une languette destinée à former la saillie 28, la découpe des encoches des éléments de contact et le poinçonnage des trous 20. Avant le pliage du flan suivant les lignes 24 et 27 indiquées sur la figure 3 et suivant les lignes de pliage de la queue 30, il convient que les fentes soient formées. Ces fentes doivent être découpées avec une largeur déterminée, par exemple de 0,25 mm. Les fentes peuvent être formées directement entre l'encoche 16 et le trou 20. Cependant, on constate en pratique que les outils de coupe d'une telle fente s'usent rapidement. Il est donc souhaitable que l'épaisseur du contact soit réduite aux endroits auxquels une fente doit être découpée.FIG. 2 represents a blank which has been formed by cutting a single member from a flat material. This member has however undergone the cutting of a tongue intended to form the projection 28, the cutting of the notches of the contact elements and the punching of the holes 20. Before folding the blank along the lines 24 and 27 indicated in FIG. 3 and along the fold lines of the tail 30, the slots should be formed. These slots must be cut with a determined width, for example 0.25 mm. The slots can be formed directly between the notch 16 and the hole 20. However, it can be seen in convenient that the cutting tools of such a slot wear out quickly. It is therefore desirable that the thickness of the contact is reduced at the places where a slot must be cut.

A cet effet, on peut envisager d'utiliser le procédé décrit dans le brevet britannique précité n° 1 129 716. Cependant, ce procédé a un inconvénient car l'obtention de fentes à bords parallèles dans une série de têtes de contact nécessite non seulement un poinçon de forme adaptée à la relaxation des contraintes, mais encore une bonne reproductibilité de ces contraintes. L'opération de matriçage qui amincit le métal nécessite alors un réglage très précis. En conséquence, l'invention concerne un procédé différent, dans lequel le matriçage qui réduit l'épaisseur du matériau du flan est réalisé avant la découpe de l'encoche en V.For this purpose, it is possible to envisage using the method described in the aforementioned British patent n ° 1,129,716. However, this method has a drawback because obtaining slots with parallel edges in a series of contact heads requires not only a punch of shape adapted to the relaxation of the constraints, but also a good reproducibility of these constraints. The forging operation which thins the metal then requires very precise adjustment. Consequently, the invention relates to a different method, in which the stamping which reduces the thickness of the blank material is carried out before cutting the V-shaped notch.

Plus précisément, la figure 5 représente une bande 50 constituant le flan dans lequel sont découpés les contacts selon l'invention. De manière bien connue dans la technique, des trous 52 de pilotage sont formés le long des deux bords du flan, afin qu'ils permettent l'avance et le positionnement précis de la bande. Dans une première opération de matriçage, une zone allongée 54 subit une réduction d'épaisseur, par exemple de 0,8 mm qui est l'épaisseur du flan à 0,6 mm, la réduction d'épaisseur étant donc de 0,2 mm. Ensuite, une seconde zone allongée 56 est matricée à l'endroit qui correspond à la formation ultérieure de la fente de l'autre tête de contact. Bien entendu, les zones matricées sont plus larges que la fente, de manière que les bords de la fente formés ultérieurement aient la faible épaisseur précitée.More specifically, FIG. 5 represents a strip 50 constituting the blank from which the contacts according to the invention are cut. As is well known in the art, pilot holes 52 are formed along the two edges of the blank, so that they allow the advance and the precise positioning of the strip. In a first stamping operation, an elongated zone 54 undergoes a reduction in thickness, for example from 0.8 mm which is the thickness of the blank to 0.6 mm, the reduction in thickness therefore being 0.2 mm . Then, a second elongated zone 56 is stamped at the place which corresponds to the subsequent formation of the slot of the other contact head. Of course, the stamped areas are wider than the slot, so that the edges of the slot formed subsequently have the aforementioned small thickness.

Ensuite, trois rectangles allongés 58 sont découpés dans la bande 50 de manière qu'ils délimitent les côtés des deux têtes de contact. Par exemple, la fente centrale a une largeur correspondant à la largeur de la joue.Then, three elongated rectangles 58 are cut from the strip 50 so that they delimit the sides of the two contact heads. For example, the central slit has a width corresponding to the width of the cheek.

Ensuite, les encoches en V, les fentes et les trous d'extrémité sont découpés comme indiqué par la référence 60. Il faut noter que, autour de ces découpages repérés par la référence 60, on n'a pas représenté les découpes allongées 58, par raison de clarté. Cependant, ces découpes allongées 58 existent, comme indiqué dans le groupe suivant, placé juste au-dessous sur la figure 5.Then, the V-notches, the slots and the end holes are cut as indicated by the reference 60. It should be noted that, around these cutouts identified by the reference 60, the elongate cutouts 58 have not been shown, for reasons of clarity. However, these elongated cutouts 58 exist, as indicated in the following group, placed just below in FIG. 5.

Ensuite, les extrémités des contacts sont découpées comme indiqué par la référence 62. A ce moment, la découpe des têtes de contact est terminée, les opérations suivantes étant, vers le bas de la figure 5, la découpe de la queue, son pliage, le pliage de la tête, puis (dans des opérations qui ne sont pas illustrées sur la figure 5) le pliage du contact lui-même et sa séparation de la bande.Then, the ends of the contacts are cut as indicated by the reference 62. At this time, the cutting of the contact heads is finished, the following operations being, at the bottom of FIG. 5, the cutting of the tail, its folding, folding the head, then (in operations which are not illustrated in FIG. 5) folding the contact itself and separating it from the strip.

Ainsi, selon l'invention, le matriçage qui réduit l'épaisseur de la zone dans laquelle doit être formée la fente est réalisé avant la formation des encoches. De cette manière, le problème posé par la contrainte du métal dans les parties de contact placées de part et d'autre de l'encoche ne pose pas le problème résolu par le procédé décrit dans le brevet britannique précité.Thus, according to the invention, the stamping which reduces the thickness of the zone in which the slot must be formed is carried out before the formation of the notches. In this way, the problem posed by the stress of the metal in the contact parts placed on either side of the notch does not pose the problem solved by the method described in the abovementioned British patent.

Bien qu'on ait représenté la zone allongée d'écrasement 19 sur une face du flan, cette zone allongée peut être formée indépendamment sur l'une ou l'autre face.Although the elongated crushing area 19 has been shown on one side of the blank, this elongated area can be formed independently on either side.

On a représenté la saillie 28 formée par une languette découpée. Cette languette a donc une certaine élasticité. Cependant, il peut aussi s'agir d'une simple déformation d'une tête, tournée vers l'autre tête. On a aussi représenté la saillie 28 formée sur la tête qui n'est pas prolongée par une queue 30. Cependant, la saillie peut être formée sur la tête de contact qui comporte la queue, du moment que l'emplacement de flexion de la queue est reporté au-delà de la joue 26, du côté opposé à celui qui comporte les éléments de contact, et que la formation de la saillie ne crée pas de zone de faiblesse dans le matériau.There is shown the projection 28 formed by a cut tongue. This tab therefore has a certain elasticity. However, it can also be a simple deformation of one head, facing the other head. Also shown is the projection 28 formed on the head which is not extended by a tail 30. However, the projection can be formed on the contact head which comprises the tail, as long as the flexion location of the tail is transferred beyond the cheek 26, on the side opposite to that which includes the contact elements, and that the formation of the projection does not create a zone of weakness in the material.

On a représenté deux éléments de contact 14 de type autodénudant. Bien entendu, il s'agit d'un mode de réalisation particulièrement avantageux dans le cas des blocs de connecteurs, mais ils peuvent aussi être remplacés par une simple queue ou languette de connexion par enroulement de fil (contact à "wrapper").Two contact elements 14 of the insulation displacement type are shown. Of course, this is a particularly advantageous embodiment in the case of connector blocks, but they can also be replaced by a single tail or connection tab by wire winding ("wrapper" contact).

Bien entendu, lorsque les deux têtes de contact sont sous forme de telles queues ou languettes de connexion, il peut être avantageux que les deux languettes ne soient pas superposées, c'est-à-dire soient décalées en direction perpendiculaire à la joue.Of course, when the two contact heads are in the form of such tails or connection tabs, it may be advantageous for the two tabs not to be superposed, that is to say are offset in a direction perpendicular to the cheek.

Claims (6)

  1. A method of manufacturing an insulation-displacement contact element of the type comprising a V-shaped notch (16) and a slot (18), the widest portion of the notch opening out into an edge of the contact element, and the slot extending the tip of the notch, the method being characterized in that it comprises:
       locally compressing an elongate zone of a blank of flat material so that the thickness of the material is reduced in the location that is to receive the slot, and on either side of said location, then;
       cutting out the blank so as to form a V-shaped notch (16) whose tip is directed towards the inside of the blank, and practically at one end of the elongate zone; and
       cutting out a slot (18) in the elongate zone of reduced thickness, running on from the tip of the notch in a direction parallel to the longitudinal axis of the contact element.
  2. A method according to claim 1, characterized in that it includes forming two contact elements (14) in two heads (10, 12) interconnected by a web (26), the contact elements being parallel to each other, and folding the blank along the edges of the web (26) in a direction (27) parallel to the longitudinal direction of the contact elements.
  3. A method according to claim 2, characterized in that it further includes cutting out a tongue (28) in at least one contact head, the tongue being designed to form a projection, and cutting out a tail (30) in at least the other contact head.
  4. A contact for a connector block, characterized in that it comprises two contact elements (14) which are formed in two contact heads (10, 12) disposed in two distinct parallel planes, each insulation-displacement contact element including a V-shaped notch (16) and a slot (18), the widest portion of the notch opening out into an edge of the contact element and the slot extending the notch at its tip, each element being manufactured by implementing a method according to claim 1, the contact being formed of a single member of flat material that is folded along an axis (27) parallel to the longitudinal direction of the elongate contact heads, the folding forming a web (26) in a direction substantially parallel to the planes of the heads and parallel to the longitudinal direction of the elements, and in that at least one of the contact heads includes a projection (28) directed towards the other contact head, said projection being disposed at a distance from the web (26) in a direction perpendicular to the fold direction and being placed beyond the web at the end thereof opposite from the end carrying the contact element (14), the thickness of the material along the edges of the slot and in the proximity thereof being less than the thickness of the remainder of the contact element.
  5. A contact according to claim 4, characterized in that the projection (28) carried by one of the contact heads projects sufficiently from the plane of said head (12) so that it normally comes into contact with the other head (10).
  6. A contact according to claim 4 or 5, characterized in that one of the contact heads is extended by a resilient tail (30).
EP89400304A 1988-02-03 1989-02-02 Contact for a telephonic connector and its manufacturing process Expired - Lifetime EP0327464B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8801257A FR2626718B1 (en) 1988-02-03 1988-02-03 CONTACT FOR TELEPHONE CONNECTOR AND MANUFACTURING METHOD THEREOF
FR8801257 1988-02-03

Publications (2)

Publication Number Publication Date
EP0327464A1 EP0327464A1 (en) 1989-08-09
EP0327464B1 true EP0327464B1 (en) 1994-07-13

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EP89400304A Expired - Lifetime EP0327464B1 (en) 1988-02-03 1989-02-02 Contact for a telephonic connector and its manufacturing process

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EP (1) EP0327464B1 (en)
DE (1) DE68916662D1 (en)
FR (1) FR2626718B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2696282A1 (en) * 1992-09-25 1994-04-01 Boga Ingenierie Contact head and contact for connectors and method for their manufacture.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963319A (en) * 1974-12-12 1976-06-15 Amp Incorporated Coaxial ribbon cable terminator
US4192570A (en) * 1978-08-21 1980-03-11 Bell Telephone Laboratories, Incorporated Insulated electrical conductor termination construction
GB2129716B (en) * 1982-11-05 1985-10-16 H & T Components Ltd Electrical connectors
US4586775A (en) * 1984-08-03 1986-05-06 General Motors Corporation Duplex insulation displacement terminal

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FR2626718A1 (en) 1989-08-04
DE68916662D1 (en) 1994-08-18
FR2626718B1 (en) 1991-09-27
EP0327464A1 (en) 1989-08-09

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