EP0035189B1 - Pushbutton for a control keyboard and method of manufacturing such a pushbutton - Google Patents

Pushbutton for a control keyboard and method of manufacturing such a pushbutton Download PDF

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Publication number
EP0035189B1
EP0035189B1 EP81101212A EP81101212A EP0035189B1 EP 0035189 B1 EP0035189 B1 EP 0035189B1 EP 81101212 A EP81101212 A EP 81101212A EP 81101212 A EP81101212 A EP 81101212A EP 0035189 B1 EP0035189 B1 EP 0035189B1
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EP
European Patent Office
Prior art keywords
button
piston
contact
push
mould
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
EP81101212A
Other languages
German (de)
French (fr)
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EP0035189A1 (en
Inventor
Jean-François Daroux
Hervé Allmendinger
Gilbert Schneider
Guy Wotling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALE International SAS
Original Assignee
Telic Alcatel SA
La Telephone Industrielle et Commerciale Telic Alcatel SA
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Filing date
Publication date
Application filed by Telic Alcatel SA, La Telephone Industrielle et Commerciale Telic Alcatel SA filed Critical Telic Alcatel SA
Publication of EP0035189A1 publication Critical patent/EP0035189A1/en
Application granted granted Critical
Publication of EP0035189B1 publication Critical patent/EP0035189B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/02—Energy stored by the attraction or repulsion of magnetic parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/036—Return force
    • H01H2221/04—Return force magnetic

Definitions

  • the present invention relates to a push button for a control keyboard, comprising at least one pair of electrical contacts brought into contact by acting on the push button, and to a method for manufacturing such a push button.
  • the components of a push button are usually assembled either by crimping the metal parts on the body of the push button, or by nesting the metal parts between two plastic parts.
  • the object of the invention is to simplify manufacture, by simultaneously positioning and calibrating the different parts constituting the push button.
  • the subject of the invention is a push button for a control keyboard, comprising at least one pair of electrical contacts secured to a support part and brought into contact with a printed circuit by acting on the push button, a button body made up by a piston sliding in a cover, the cover having a magnetic surface cooperating with a metal counter plate integral with the piston to constitute a magnetic return device for the push button (see for example DE-A-2313750), characterized by the fact that the electrical contact support part and the metal counterplate are assembled on the piston of the button by overmolding.
  • FIGs 1 and 2 there is shown a keyboard 1 provided with its identical pushbuttons 2 arranged in several rows above a printed circuit 3 with outputs 4. One of the pushbuttons is shown in section in figure 2.
  • This push button is shown in enlarged view in Figure 3 with its separate elements and in Figure 4 after assembly of its elements. It includes a button head which can optionally consist of two parts 5 and 7 obtained during a double injection molding operation, for example, in order to mark the key; the lower part 7 is mounted by clipping on a vertical piston 6, forming the body of the button, by means of two hooks 8 formed on the edge of the piston, which come to engage in two notches 10 formed inside the head .
  • This piston 6 is slidably mounted in a cylinder 9 forming a guide barrel. The latter is integral with the cover 11 of the keyboard and protrudes clearly above the upper level of the cover.
  • the counter plate 14 and the contact parts 15 are assembled at the base of the piston 6 by means of an insulating head 18 produced during the molding of the button piston, as will be seen below.
  • the shape of the counterplate 14 is shown in Figure 5; it comprises a central orifice 19 for the passage of the piston 6 and of the cutouts 20, 21 making it possible to pre-wire the contact blades 16 and 17 during assembly.
  • the shape of the contact piece 15 is shown in Figure 6; it includes a central part 22 provided with an orifice 50 for the passage of the piston 6 and two lateral tabs 16, 17 forming contact springs and terminated by contact pads 23, 24 intended to come into contact with metallized pads of the circuit printed 3 (fig. 4).
  • Figure 4 shows the push button in the rest position. In this position, the piston 6 is held in the high position by magnetic attraction 13. If the push button is pressed, the counter-plate 14 is detached from the magnetic sheet 13 and the contacts 23, 24 are closed. with the printed circuit 3. When the push button is released, it goes up an abrupt movement ensuring an abrupt break in contact.
  • the barrel 9 while guiding the piston 6 makes it possible to obtain a seal against the run-off of a liquid on the top of the cover 11.
  • the clipping of the button head on the piston 6 of the button 2 ensures both good fixing of these elements as well as the possibility of interchanging the button heads.
  • FIG. 7 illustrates the process for overmolding the contact blades on the piston of the push button by means of a two-part mold as shown, which ensures during the molding of the piston simultaneously the overmolding of the counterplate 14 and the contact part 15.
  • the metal counter plates 14 and the contact parts 15 are presented in the form of continuous strips between the two half-shells 25, 26 of the mold.
  • the lower half-shell 26 has a housing in the shape of the contact piece 15, having a central stud 27 for the central hole 50 of the contact piece 15 and two lateral passages 28, 29 for receiving the two branches respectively (lugs ) lateral 16,17 of the contact part. These lateral corridors have their inclined bottom so as to allow the bending of the lateral branches (lugs) 16, 17 of the contact piece when the mold is closed.
  • the upper half-shell 25 has the complementary shape.
  • the lower half-shell 26 also has six punches 31 for fixing the contact piece 15, so that the metal counter plate 14 and the contact piece 15 are in perfect contact with one another.
  • the upper half-shell 25 has a vertical housing 32, in which the piston of the button 6 is molded, and two pins 33 for guiding the parts. These two pins 33 pass through holes 34 in the strip of counter plates, then through holes 35 in the strip of contact pieces, then slide in two lateral grooves 36 in the lower half-shell 26 so as to position these four elements one above the other.
  • the third phase consists of injecting plastic material into the mold. Once this material has cooled sufficiently, after demolding and cutting the counter-plates and contact parts at their connections assembled with its counter-plate and its contact part.
  • the counterplate 14 with two lugs 39 on which the corners 41 of the contact piece will be folded down to reinforce the fixing of these pieces to one another.
  • the plastic material includes these pins which ensures good support after cooling.
  • the invention applies to any keyboard with push-in keys for electric or electronic machines. It also applies to an isolated push button, the keyboard then comprising only one pair of contacts.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Push-Button Switches (AREA)
  • Manufacture Of Switches (AREA)

Description

La présente invention concerne un bouton-poussoir pour clavier de commande, comportant au moins une paire de contacts électriques mis en contact en agissant sur le bouton-poussoir et un procédé de fabrication d'un tel bouton-poussoir.The present invention relates to a push button for a control keyboard, comprising at least one pair of electrical contacts brought into contact by acting on the push button, and to a method for manufacturing such a push button.

Les éléments constitutifs d'un bouton-poussoir sont habituellement assemblés soit par sertissage des pièces métalliques sur le corps du bouton-poussoir, soit par imbrication des pièces métalliques entre deux pièces plastiques.The components of a push button are usually assembled either by crimping the metal parts on the body of the push button, or by nesting the metal parts between two plastic parts.

Le but de l'invention est de simplifier la fabrication, en réalisant simultanément le positionnement et le calibrage des différentes pièces constituant le bouton-poussoir.The object of the invention is to simplify manufacture, by simultaneously positioning and calibrating the different parts constituting the push button.

L'invention a pour objet un bouton-poussoir pour clavier de commande, comportant au moins une paire de contacts électriques solidaires d'une pièce support et mis en contact avec un circuit imprimé en agissant sur le bouton-poussoir, un corps de bouton constitué par un piston coulissant dans un capot, le capot présentant une surface magnétique coopérant avec une contre-plaque métallique solidaire du piston pour constituer un dispositif de rappel magnétique du bouton-poussoir (voir par exemple DE-A-2313750), caractérisé par le fait que la pièce support de contact électrique et la contre-plaque métallique sont assemblées sur le piston du bouton par surmoulage.The subject of the invention is a push button for a control keyboard, comprising at least one pair of electrical contacts secured to a support part and brought into contact with a printed circuit by acting on the push button, a button body made up by a piston sliding in a cover, the cover having a magnetic surface cooperating with a metal counter plate integral with the piston to constitute a magnetic return device for the push button (see for example DE-A-2313750), characterized by the fact that the electrical contact support part and the metal counterplate are assembled on the piston of the button by overmolding.

L'invention a également pour objet un procédé de fabrication d'un tel bouton-poussoir caractérisé par le fait qu'il consiste

  • - à présenter dans une chaîne de transfert une bande de contre-plaques métalliques et une bande de pièce support de contact,
  • - à positionner une pièce support de contact et une contre-plaquemétallique entre deux demi-coquilles d'un moule pour le piston, ce moule étant muni de couloirs inclinés qui servent à loger les lames de contact,
  • - à rapprocher les deux demi-coquilles du moule de façon à plaquer les deux éléments l'un sur l'autre,
  • - à injecter de la matière plastique dans le moule,
  • - et à monter le piston sur le capot et la tête de bouton sur le piston.
The invention also relates to a method of manufacturing such a push button characterized in that it consists
  • to present in a transfer chain a strip of metal counter plates and a strip of contact support part,
  • to position a contact support piece and a metal plywood between two half-shells of a mold for the piston, this mold being provided with inclined passages which serve to house the contact blades,
  • - bringing the two half-shells of the mold together so as to press the two elements one on the other,
  • - to inject plastic material into the mold,
  • - and to mount the piston on the cover and the button head on the piston.

L'invention va être précisée par la description donnée ci-après d'un mode préféré de réalisation de l'invention, en référence au dessin annexé dans lequel :

  • Les figures 1 et 2 sont respectivement une vue de dessus et une vue en élévation partiellement coupée d'un clavier à boutons-poussoirs selon l'invention.
  • La figure 3 est une vue éclatée montrant les divers éléments constitutifs d'un bouton-poussoir.
  • La figure 4 est une vue en élévation et en coupe d'un bouton-poussoir selon la figure 3.
  • La figure 6 est une vue en plan d'une pièce support de contact.
  • La figure 7 est une vue éclatée montrant le moule utilisé pour l'assemblage du bouton-poussoir.
The invention will be clarified by the description given below of a preferred embodiment of the invention, with reference to the accompanying drawing in which:
  • Figures 1 and 2 are respectively a top view and a partially cut elevation view of a push button keyboard according to the invention.
  • Figure 3 is an exploded view showing the various components of a push button.
  • FIG. 4 is a view in elevation and in section of a push button according to FIG. 3.
  • Figure 6 is a plan view of a contact support part.
  • Figure 7 is an exploded view showing the mold used for the assembly of the push button.

Dans les figures 1 et 2 on a représenté un clavier 1 muni de ses boutons-poussoirs 2 identiques disposés en plusieurs rangées au-dessus d'un circuit imprimé 3 avec sorties 4. L'un des boutons-poussoirs est représenté en coupe en figure 2.In Figures 1 and 2 there is shown a keyboard 1 provided with its identical pushbuttons 2 arranged in several rows above a printed circuit 3 with outputs 4. One of the pushbuttons is shown in section in figure 2.

Ce bouton-poussoir est représenté en vue agrandie sur la figure 3 avec ses éléments séparés et sur la figure 4 après assemblage de ses éléments. Il comprend une tête de bouton qui peut être constituée éventuellement de deux parties 5 et 7 obtenues lors d'une opération de moulage par double injection, par exemple, afin de réaliser le marquage de la touche ; la partie inférieure 7 est montée par clipsage sur un piston vertical 6, formant le corps du bouton, au moyen de deux crochets 8 ménagés sur le bord du piston, qui viennent s'engager dans deux encoches 10 ménagées à l'intérieur de la tête. Ce piston 6 est monté coulissant dans un cylindre 9 formant fût de guidage. Ce dernier fait corps avec le capot 11 du clavier et dépasse nettement au-dessus du niveau supérieur du capot. Sous le capot 11 sont placées deux plaques ou feuilles, l'une métallique 12 jouant le rôle de shunt magnétique, l'autre en élastomère magnétique 13. Cette dernière coopère avec une contre-plaque métallique 14 pour le rappel magnétique du bouton-poussoir. Sous cette contre-plaque 14 est disposée une pièce de contact 15 faisant partie d'une pièce découpée puis métallisée dont la forme est représentée figure 6 ; cette pièce de contact 15 est munie de lames de contact coopérant avec le circuit imprimé 3.This push button is shown in enlarged view in Figure 3 with its separate elements and in Figure 4 after assembly of its elements. It includes a button head which can optionally consist of two parts 5 and 7 obtained during a double injection molding operation, for example, in order to mark the key; the lower part 7 is mounted by clipping on a vertical piston 6, forming the body of the button, by means of two hooks 8 formed on the edge of the piston, which come to engage in two notches 10 formed inside the head . This piston 6 is slidably mounted in a cylinder 9 forming a guide barrel. The latter is integral with the cover 11 of the keyboard and protrudes clearly above the upper level of the cover. Under the cover 11 are placed two plates or sheets, one metallic 12 playing the role of magnetic shunt, the other made of magnetic elastomer 13. The latter cooperates with a metal counter plate 14 for the magnetic return of the push button. Under this counter-plate 14 is disposed a contact piece 15 forming part of a cut-out and then metallized piece, the shape of which is shown in FIG. 6; this contact piece 15 is provided with contact blades cooperating with the printed circuit 3.

La contre-plaque 14 et les pièces de contact 15 sont assemblées à la base du piston 6 au moyen d'une tête isolante 18 réalisée lors du moulage du piston de bouton, comme on le verra plus loin.The counter plate 14 and the contact parts 15 are assembled at the base of the piston 6 by means of an insulating head 18 produced during the molding of the button piston, as will be seen below.

La forme de la contre-plaque 14 est représentée sur la figure 5 ; elle comporte un orifice central 19 pour le passage du piston 6 et des découpes 20, 21 permettant de réaliser un précambrage des lames de contact 16 et 17 lors de l'assemblage.The shape of the counterplate 14 is shown in Figure 5; it comprises a central orifice 19 for the passage of the piston 6 and of the cutouts 20, 21 making it possible to pre-wire the contact blades 16 and 17 during assembly.

La forme de la pièce de contact 15 est représentée sur la figure 6 ; elle comprend une partie centrale 22 munie d'un orifice 50 pour le passage du piston 6 et deux pattes latérales 16, 17 formant ressorts de contact et terminées par des plots de contact 23, 24 destinés à venir en contact avec des plots métallisés du circuit imprimé 3 (fig. 4).The shape of the contact piece 15 is shown in Figure 6; it includes a central part 22 provided with an orifice 50 for the passage of the piston 6 and two lateral tabs 16, 17 forming contact springs and terminated by contact pads 23, 24 intended to come into contact with metallized pads of the circuit printed 3 (fig. 4).

La figure 4 représente le bouton-poussoir en position repos. Dans cette position le piston 6 est maintenu en position haute par attraction magnétique 13. Si l'on appuie sur le bouton-poussoir, on obtient le décollement de la contre-plaque 14 de la feuille magnétique 13 et la fermeture des contacts 23, 24 avec le circuit imprimé 3. Lorsque l'on lâche le bouton-poussoir celui-ci remonte d'un mouvement brusque assurant une rupture brusque du contact.Figure 4 shows the push button in the rest position. In this position, the piston 6 is held in the high position by magnetic attraction 13. If the push button is pressed, the counter-plate 14 is detached from the magnetic sheet 13 and the contacts 23, 24 are closed. with the printed circuit 3. When the push button is released, it goes up an abrupt movement ensuring an abrupt break in contact.

Le fût 9 tout en assurant le guidage du piston 6 permet d'obtenir une étanchéité au ruissellement d'un liquide sur le dessus du capot 11.The barrel 9 while guiding the piston 6 makes it possible to obtain a seal against the run-off of a liquid on the top of the cover 11.

La fixation par surmoulage de la pièce de contact 15 et de la contre-plaque 14 sur le piston 6 du bouton assure un parfait maintien des ressorts de contact et une garantie de bon établissement du contact électrique.The fixing by overmolding of the contact piece 15 and of the counter-plate 14 on the piston 6 of the button ensures perfect retention of the contact springs and a guarantee of good establishment of the electrical contact.

Le clipsage de la tête de bouton sur le piston 6 du bouton 2 assure à la fois une bonne fixation de ces éléments ainsi qu'une possibilité d'interchan- ger les têtes de bouton.The clipping of the button head on the piston 6 of the button 2 ensures both good fixing of these elements as well as the possibility of interchanging the button heads.

La figure 7 illustre le procédé de surmoulage des lames de contact sur le piston du bouton-poussoir au moyen d'un moule en deux parties comme représenté, qui assure lors du moulage du piston simultanément le surmoulage de la contre-plaque 14 et de la pièce de contact 15.FIG. 7 illustrates the process for overmolding the contact blades on the piston of the push button by means of a two-part mold as shown, which ensures during the molding of the piston simultaneously the overmolding of the counterplate 14 and the contact part 15.

Les contre-plaques métalliques 14 et les pièces de contact 15 sont présentées sous forme de bandes continues entre les deux demi-coquilles 25, 26 du moule.The metal counter plates 14 and the contact parts 15 are presented in the form of continuous strips between the two half-shells 25, 26 of the mold.

La demi-coquille inférieure 26 comporte un logement de la forme de la pièce de contact 15, présentant un téton central 27 pour le trou central 50 de la pièce de contact 15 et deux couloirs latéraux 28, 29 pour recevoir respectivement les deux branches (pattes) latérales 16,17 de la pièce de contact. Ces couloirs latéraux ont leur fond incliné de façon à permettre le cambrage des branches (pattes) latérales 16, 17 de la pièce de contact lors de la fermeture du moule. La demi-coquille supérieure 25 comporte la forme complémentaire. La demi-coquille inférieure 26 présente également six poinçons 31 pour la fixation de la pièce de contact 15, afin que la contre-plaque métallique 14 et la pièce de contact 15 soient en parfait contact l'un contre l'autre.The lower half-shell 26 has a housing in the shape of the contact piece 15, having a central stud 27 for the central hole 50 of the contact piece 15 and two lateral passages 28, 29 for receiving the two branches respectively (lugs ) lateral 16,17 of the contact part. These lateral corridors have their inclined bottom so as to allow the bending of the lateral branches (lugs) 16, 17 of the contact piece when the mold is closed. The upper half-shell 25 has the complementary shape. The lower half-shell 26 also has six punches 31 for fixing the contact piece 15, so that the metal counter plate 14 and the contact piece 15 are in perfect contact with one another.

La demi-coquille supérieure 25 comporte un logement vertical 32, dans lequel est moulé le piston du bouton 6, et deux tétons 33 de guidage des pièces. Ces deux tétons 33 passent dans des trous 34 de la bande de contre-plaques, puis dans des trous 35 de la bande de pièces de contact, puis coulissent dans deux gorges latérales 36 de la demi-coquille inférieure 26 de façon à positionner ces quatre éléments les uns au-dessus des autres.The upper half-shell 25 has a vertical housing 32, in which the piston of the button 6 is molded, and two pins 33 for guiding the parts. These two pins 33 pass through holes 34 in the strip of counter plates, then through holes 35 in the strip of contact pieces, then slide in two lateral grooves 36 in the lower half-shell 26 so as to position these four elements one above the other.

La mise en oeuvre du procédé de surmoulage est réalisée en trois phases de la façon suivante : La première phase consiste à présenter dans une chaîne de transfert une bande de contre-plaques assemblées par des liaisons 37 et une bande de pièces de contact assemblées par des liaisons 38, ces éléments étant positionnés l'un par rapport à l'autre et par rapport aux deux demi-coquilles du moule au moyen des deux tétons de guidage 33. La deuxième phase d'assemblage proprement dite consiste à rapprocher les deux demi-coquilles du moule de façon à assurer simultanément :

  • - le positionnement de la contre-plaque 14 par rapport à la pièce de contact 15, d'une part, et de ces deux éléments par rapport au moule d'autre part,
  • - le placage de ces deux éléments l'un sur l'autre à l'aide des six poinçons de fixation 31,
  • - le cambrage des ressorts de contact réalisé au moyen des découpes 20, 21 obtenues dans la contre-plaque et des couloirs 28, 29 prévus dans les demi-coquilles.
The implementation of the overmolding process is carried out in three phases as follows: The first phase consists in presenting in a transfer chain a strip of counter-plates assembled by connections 37 and a strip of contact pieces assembled by connections 38, these elements being positioned relative to each other and relative to the two half-shells of the mold by means of the two guide pins 33. The second assembly phase proper consists in bringing the two half-pieces together mold shells so as to simultaneously ensure:
  • the positioning of the counter plate 14 relative to the contact piece 15, on the one hand, and of these two elements relative to the mold on the other hand,
  • the plating of these two elements one on the other using the six fixing punches 31,
  • - the bending of the contact springs produced by means of the cutouts 20, 21 obtained in the counterplate and of the passages 28, 29 provided in the half-shells.

La troisième phase consiste à injecter de la matière plastique dans le moule. Une fois cette matière suffisamment refroidie, après démoulage et découpe des contre-plaques et des pièces de contact au niveau de leurs liaisons assemblé avec sa contre-plaque et sa pièce de contact.The third phase consists of injecting plastic material into the mold. Once this material has cooled sufficiently, after demolding and cutting the counter-plates and contact parts at their connections assembled with its counter-plate and its contact part.

Au cours de l'opération de moulage, une cavité 32 à l'aide du téton 27 est ménagée à la base du piston de façon à permettre de saisir et déplacer ce dernier dans la chaîne de transfert, lors de l'opération de montage du clavier de commande. Le procédé selon l'invention permet ainsi de réaliser en une seule opération :

  • - le surmoulage de la pièce de contact et de la contre-plaque sur le piston du bouton,
  • - le cambrage des lames de contact,
  • - le positionnement avec calibrage des différentes pièces assemblées.
During the molding operation, a cavity 32 by means of the stud 27 is formed at the base of the piston so as to allow it to be grasped and moved in the transfer chain, during the assembly operation of the control keyboard. The method according to the invention thus makes it possible to carry out in a single operation:
  • - the overmolding of the contact part and the counterplate on the piston of the button,
  • - the arching of the contact blades,
  • - positioning with calibration of the various assembled parts.

Les opérations de fixation, positionnement et cambrage étant menées automatiquement en une seule fois, au lieu de trois opérations séparées, il en résulte un gain de temps et de coût en production appréciable. De plus le calibrage et le cambrage sont réalisés avec une meilleure précision.The fixing, positioning and bending operations being carried out automatically at the same time, instead of three separate operations, this results in significant time and cost savings in production. In addition, calibration and arching are carried out with better precision.

On peut également munir la contre-plaque 14 de deux ergots 39 sur lesquels seront rabattus des coins 41 de la pièce de contact pour renforcer la fixation de ces pièces l'une sur l'autre. Lors de l'opération de moulage, la matière plastique englobe ces ergots ce qui assure un bon maintien après refroidissement.It is also possible to provide the counterplate 14 with two lugs 39 on which the corners 41 of the contact piece will be folded down to reinforce the fixing of these pieces to one another. During the molding operation, the plastic material includes these pins which ensures good support after cooling.

L'invention s'applique à tout clavier à touches enfonçables pour machines électriques ou électroniques. Elle s'applique également à un bouton-poussoir isolé, le clavier ne comportant alors qu'une seule paire de contacts.The invention applies to any keyboard with push-in keys for electric or electronic machines. It also applies to an isolated push button, the keyboard then comprising only one pair of contacts.

Claims (5)

1. A push-button (2) for a control keyboard comprising at least one pair of electric contacts (23, 24) which are integral with a support piece (15) and which are brought into contact with a printed circuit (3) by depressing the push-button (2), a body of a button constituted by a piston (6) sliding in a cover (11), the cover having a magnetic surface (13) which co-operates with a metal backing plate (14) integral with the piston (6) to constitute a magnetic push-button (2) return device, characterized in that the electric contact (23, 24) support piece (15) and the metal backing plate (14) are assembled on the piston (6) of the push-button by a moulding process.
2. A push-button (2) according to claim 1, characterized in that the electric contact (23, 24) support piece (15) includes a central portion with a window (50) for the push-button piston (6) to pass through, and two side strips (16, 17) set in opposite directions and forming springs and supporting the contacts (23, 24).
3. A push-button (2) according to either one of claims 1 or 2, characterized in that the backing plate (14) has cut-out portions (20, 21) set in opposite directions, allowing the contact strips to be bent prior to assembly.
4. A method for fabricating a push-button according to one of the preceding claims, characterized in that it consists in
- presenting a strip of metal backing plates (14) and a strip of contact pieces (15) in a transfer line,
- positioning a contact support piece (15) and a metal backing plate (14) between two half shells (25, 26) of a mould for the piston (6), this mould being provised with inclined passages (28, 29) serving to accommodate the contact strips (16, 17),
- bringing the two half shells (25, 26) of the mould together so as to place the two components one against the other,
- injecting plastic material in the mould,
- and mounting the piston (6) on the cover and the head of the button (2) on the piston (6).
5. A method according to claim 4, characterized in that the components are assembled at the same time as the push-button body (6) is moulded.
EP81101212A 1980-02-27 1981-02-20 Pushbutton for a control keyboard and method of manufacturing such a pushbutton Expired EP0035189B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8004307A FR2476900A1 (en) 1980-02-27 1980-02-27 PUSH BUTTON FOR CONTROL KEYBOARD AND METHOD OF MAKING SAME
FR8004307 1980-02-27

Publications (2)

Publication Number Publication Date
EP0035189A1 EP0035189A1 (en) 1981-09-09
EP0035189B1 true EP0035189B1 (en) 1984-07-04

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ID=9239038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101212A Expired EP0035189B1 (en) 1980-02-27 1981-02-20 Pushbutton for a control keyboard and method of manufacturing such a pushbutton

Country Status (5)

Country Link
EP (1) EP0035189B1 (en)
JP (1) JPS56136417A (en)
DE (1) DE3164499D1 (en)
ES (1) ES8206086A1 (en)
FR (1) FR2476900A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2544545A1 (en) * 1983-04-18 1984-10-19 Gerard Michel Operating keypad for electrical or electronic devices
US4689608A (en) * 1985-01-22 1987-08-25 International Business Machines Corporation Magnetically snap actuated contact keyboard apparatus
GB2183916B (en) * 1985-11-13 1990-02-07 Devlin Electronics Limited Improvements relating to telephone keypads
DE3627554A1 (en) * 1986-08-14 1988-02-25 Schoeller & Co Elektrotech METHOD FOR PRODUCING A KEY SWITCHING DEVICE AND KEY SWITCHING DEVICE
CN102184790A (en) * 2010-07-30 2011-09-14 鸿富锦精密工业（深圳）有限公司 Switching device
DE102017114189A1 (en) * 2017-06-27 2018-12-27 Cherry Gmbh Carrier element for a keyboard, keyboard and method for producing a keyboard

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2022936A1 (en) * 1968-11-08 1970-08-07 Philips Nv
FR2044038A5 (en) * 1969-05-05 1971-02-19 Crouzet & Cie
DE2209620A1 (en) * 1971-03-03 1972-09-14 Burgess Micro Switch Co Ltd Actuator for switches with snap action
US3826885A (en) * 1972-06-23 1974-07-30 Wild Rover Corp Pushbutton switch having spider-shaped contact contact carrier
DE2313750A1 (en) * 1973-03-20 1974-10-03 Leo Dr Steipe SWITCH OR PRESSURE CONTACT WITH ENERGY STORAGE AND JUMPING POINT
US3934104A (en) * 1974-09-23 1976-01-20 Stout Glenn M Push-button switch
US3942145A (en) * 1974-09-03 1976-03-02 Teletype Corporation Snap-action switch
FR2395546A2 (en) * 1977-06-22 1979-01-19 Serras Paulet Edouard ALPHANUMERIC KEYPAD WITH PRESSURE KEYS FOR ELECTRICAL OR ELECTRONIC MACHINE

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH388667A (en) * 1958-12-08 1965-02-28 Kooperativa Foerbundet Setting mechanism on computing office machines
JPS5256377A (en) * 1976-11-06 1977-05-09 Matsushita Electric Ind Co Ltd Method of manufacturing push type switch

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2022936A1 (en) * 1968-11-08 1970-08-07 Philips Nv
FR2044038A5 (en) * 1969-05-05 1971-02-19 Crouzet & Cie
DE2209620A1 (en) * 1971-03-03 1972-09-14 Burgess Micro Switch Co Ltd Actuator for switches with snap action
US3826885A (en) * 1972-06-23 1974-07-30 Wild Rover Corp Pushbutton switch having spider-shaped contact contact carrier
DE2313750A1 (en) * 1973-03-20 1974-10-03 Leo Dr Steipe SWITCH OR PRESSURE CONTACT WITH ENERGY STORAGE AND JUMPING POINT
US3942145A (en) * 1974-09-03 1976-03-02 Teletype Corporation Snap-action switch
US3934104A (en) * 1974-09-23 1976-01-20 Stout Glenn M Push-button switch
FR2395546A2 (en) * 1977-06-22 1979-01-19 Serras Paulet Edouard ALPHANUMERIC KEYPAD WITH PRESSURE KEYS FOR ELECTRICAL OR ELECTRONIC MACHINE

Also Published As

Publication number Publication date
DE3164499D1 (en) 1984-08-09
FR2476900A1 (en) 1981-08-28
JPS56136417A (en) 1981-10-24
EP0035189A1 (en) 1981-09-09
FR2476900B1 (en) 1982-06-25
ES499831A0 (en) 1982-06-16
ES8206086A1 (en) 1982-06-16

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