EP0376949B1 - Electric or electronic control keyboard - Google Patents

Electric or electronic control keyboard Download PDF

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Publication number
EP0376949B1
EP0376949B1 EP88905210A EP88905210A EP0376949B1 EP 0376949 B1 EP0376949 B1 EP 0376949B1 EP 88905210 A EP88905210 A EP 88905210A EP 88905210 A EP88905210 A EP 88905210A EP 0376949 B1 EP0376949 B1 EP 0376949B1
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EP
European Patent Office
Prior art keywords
plate
front plate
magnetic
keyboard
case
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Expired - Lifetime
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EP88905210A
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German (de)
French (fr)
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EP0376949A1 (en
Inventor
Bernard Danglot
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Individual
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Individual
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Priority to AT88905210T priority Critical patent/ATE116475T1/en
Publication of EP0376949A1 publication Critical patent/EP0376949A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/0066—Permanent magnet actuating reed switches magnet being removable, e.g. part of key pencil

Definitions

  • the invention relates to an electrical or electronic control keyboard.
  • the object of the present invention is to remedy this drawback, to provide an ultra-flat keyboard and to improve its performance.
  • the electrical or electronic control keyboard consisting of a housing, a closing front plate not allowing a magnetic flux emitted by a magnet or magnetic key to pass except at the locations of lights provided for this purpose, a bulb with blades and legs, by light being placed in the housing parallel and flush with the front plate so as to detect the flow passing through this light, a printed circuit in the bottom of the housing and to which the bulbs are connected, which keyboard is characterized by the makes that one leg of each bulb is placed under the corresponding light, while the body of the bulb with the other leg are placed under the part full of the front plate.
  • the tab placed under the light is curved in a plane parallel to the front plate.
  • a cable comes out laterally or through the rear face of the box to connect it to a decoder located at a distance.
  • the lights of the front plate are arranged in a continuous parallel line and a short distance from the edge of the box, the axis of each bulb passes substantially through the center of the plate and the center of a light.
  • the keyboard is strictly waterproof and can be submerged; for this purpose the lights of the front plate are filled with a product allowing the magnetic field to pass through, such as a resin, and the front plate is glued or welded in a leaktight manner on the housing, just as the cable is glued by resin in its exit hole.
  • a product allowing the magnetic field to pass through, such as a resin
  • the front plate is glued or welded in a leaktight manner on the housing, just as the cable is glued by resin in its exit hole.
  • the keyboard is provided on its front face with a label allowing the location of the lights and possibly their numbering. Furthermore, its thickness is reduced to the thickness of the bulb increased by that of the housing and the front plate.
  • Such a keyboard can be fixed on the rear face of a window or any other non-magnetic plate; each bulb can be activated by a magnetic key presented on the front of the glass, in line with the corresponding mark on the sticker.
  • the surface area of the lights on the front plate is adaptable to its distance from the magnetic key, by replacing the front plate, or adding an additional plate in front of the already existing plate, an additional fixed or sliding plate constituting a partial mask, the lights are of smaller diameter.
  • the keyboard consists of a box 1, of shallow depth closed by a front plate 2 comprising lights 3. From this box 1, a cable 4 comes out which connects it to another box 5, containing the coder-decoder device.
  • Fig. 2 shows the body of the bulb 9 arranged parallel under the solid part of the front plate 2. Only the tab 6 passes in front of the light 3. The tab 6 is bent and the free ends of the two tabs are fixed to a printed circuit. This circuit can be printed directly on the bottom 19 of the box 1, or on a special plate 8 fixed on said bottom of the box.
  • an indicator sheet 20 with numbers, letters or the like, above the lights 3.
  • an indicator sheet 20 with numbers, letters or the like, above the lights 3.
  • a magnet 21 facing a mark and a light 3
  • a magnetic flux is transmitted to the tab 6 (and exclusively on lug 6) which conducts this flow to the blade following it to excite the circuit of the bulb 9.
  • the bulb is no longer energized.
  • Fig. 3 shows that the bulbs 9 to 18 are arranged radially, each bulb is in the axis going from the center of the box 1 to the center of a light 3.
  • the non-curved tabs 7 are all directed towards the center of the box.
  • the cable 4 preferably leaves the box 1 through the center of the bottom of the box.
  • the keyboard is strictly waterproof and can be submerged.
  • the lights 3 of the front plate 2 are filled with a resin (or another product) letting the magnetic field pass, and the front plate 2 is glued or welded in a leaktight manner on the housing 1. From even the outlet hole of the cable 4 is blocked with resin according to a preferred method of manufacture.
  • the keyboard as described is fixed or applied to the rear face of a window or any other non-magnetic plate, and each bulb is actuable by a magnet presented on the front face of said window, in line with the corresponding reference.
  • the command is transmitted to the codec-decoder 5 which can be distant from the keyboard.
  • the keyboard is thin, five millimeters for example, and of a small surface, square of five centimeters of side for example, so it is easily accommodatable, see concealable inside a building or a piece of furniture.
  • the thickness of the glass (or of any other non-magnetic plate) is very different depending on the use case, and the magnetic flux which crosses it at a more or less long distance to be traversed by widening more or less.
  • the useful surface of each light is adaptable to this flow, and in fact adjustable according to the distance between it and the magnetic key. This adaptation can be carried out by various means. The technically simplest way is to remove the plate 2 and replace it with another plate externally of the same size, but the diameter of the lights is different. We can also keep the existing plate 2 and fix another plate on it with lights in the same locations but with a smaller diameter.
  • the installer can have at his disposal a set of various plates, the diameter of the lights of which differs according to the category of the plate, and choose at the time of assembly a plate of the category most appropriate for the distance between the bulb. 9 and the magnet 21, whether in the case of the replacement of the plate 2 or in the case of the addition of an additional plate.

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  • Input From Keyboards Or The Like (AREA)
  • Casings For Electric Apparatus (AREA)
  • Lock And Its Accessories (AREA)

Abstract

The keyboard described consists of a housing, a front closure plate (2) preventing the passage of magnetic flux except at the opening locations (3) designed for this purpose, one lamp as shown in (9) with blades and lugs per opening and placed in the housing parallel and flush with the front plate (2) so as to detect the flux passing through said opening (3), a printed circuit at the back of the housing, to which the lamps (9 to 18) are connected. A lug of each lamp is arranged under the corresponding opening, whereas the body of the lamp with the other lug are placed under the solid part of the front plate (2). Applications: keyboards placed behind a glass panel and controlled by a magnet.

Description

L'invention concerne un clavier de commande électrique ou électronique.The invention relates to an electrical or electronic control keyboard.

Dans le brevet français n° 83.19245 déposé le 1er décembre 1983, au nom de Monsieur DANGLOT Bernard, qui correspond au document EP-A-204.050, on a décrit un clavier permettant la formation de codes de commandes électriques, constitué d'une boîte fermée contenant un dispositif comprenant une ou des ampoules à lames de contacts sensibles à un champ magnétique, caractérisé en ce que l'ouverture de la boîte est obstruée par une paroi à lumières, dont la partie pleine est constituée en une matière ne laissant pas passer le champ magnétique, et en ce que les lames d'une ampoule sont disposées sous chaque lumière de cette paroi de façon à être actionnables sous l'effet d'un champ magnétique provoqué par un aimant amovible présenté devant ladite lumière, extérieurement à la boîte.In the French patent n ° 83.19245 filed on December 1, 1983, in the name of Mr. DANGLOT Bernard, which corresponds to document EP-A-204.050, a keyboard has been described allowing the formation of electrical control codes, consisting of a closed box containing a device comprising one or more bulbs with contact blades sensitive to a magnetic field, characterized in that the opening of the box is obstructed by a light wall, the solid part of which is made of a material which does not allow the magnetic field, and in that the blades of a bulb are arranged under each light of this wall so as to be actuable under the effect of a magnetic field caused by a removable magnet presented in front of said light, outside the box.

Bien que donnant entière satisfaction, le clavier décrit dans le brevet précité, ne peut pas être utilisé dans n'importe quel emplacement en raison de son volume. La présente invention a pour but de remédier à cet inconvénient, de réaliser un clavier ultra-plat et d'améliorer ses performances.Although entirely satisfactory, the keyboard described in the aforementioned patent cannot be used in any location because of its volume. The object of the present invention is to remedy this drawback, to provide an ultra-flat keyboard and to improve its performance.

On connaît également le documnet US-A-3.713.056 concernant un dispositif dont le couvercle est en un matériau laissant passer le flux magnétique et comporte des dépressions sous chacune desquelles est située une lampe à lames. Ces dépressions ont pour but, non seulement d'indiquer là où il faut présenter l'aimant, mais également de signaler la zone d'excitation privilégiée. De plus, la non-excitation des autres lampes est obtenue par une localisation judicieuse des ampoules par rapport à des diagonales.We also know the document US-A-3,713,056 relating to a device whose cover is made of a material allowing the magnetic flux to pass and comprises depressions under each of which is located a lamplight. The purpose of these depressions is not only to indicate where the magnet must be presented, but also to indicate the preferred excitation zone. In addition, the non-excitation of the other lamps is obtained by judicious localization of the bulbs relative to the diagonals.

Un tel dispositif est assez encombrant et présente en fait les mêmes inconvénients que celui décnt ci-dessus.Such a device is quite bulky and in fact has the same drawbacks as that described above.

Selon l'invention, le clavier de commande électrique ou électronique constitué par un boîtier, une plaque avant de fermeture ne laissant pas passer un flux magnétique émis par un aimant ou clef magnétique sauf aux emplacements de lumières prévus à cet effet, une ampoule à lames et pattes, par lumière étant placée dans le boîtier parallèlement et au ras de la plaque avant de façon à détecter le flux passant par cette lumière, un circuit imprimé dans le fond du boîtier et auquel les ampoules sont connectées, lequel clavier est caractérisé par le fait qu'une patte de chaque ampoule est disposée sous la lumière correspondante, tandis que le corps de l'ampoule avec l'autre patte sont placées sous la partie pleine de la plaque avant. La patte placée sous la lumière est recourbée dans un plan parallèle à la plaque avant. Un câble sort latéralement ou par la face arrière du boîtier pour le relier à un décodeur situé à distance.According to the invention, the electrical or electronic control keyboard consisting of a housing, a closing front plate not allowing a magnetic flux emitted by a magnet or magnetic key to pass except at the locations of lights provided for this purpose, a bulb with blades and legs, by light being placed in the housing parallel and flush with the front plate so as to detect the flow passing through this light, a printed circuit in the bottom of the housing and to which the bulbs are connected, which keyboard is characterized by the makes that one leg of each bulb is placed under the corresponding light, while the body of the bulb with the other leg are placed under the part full of the front plate. The tab placed under the light is curved in a plane parallel to the front plate. A cable comes out laterally or through the rear face of the box to connect it to a decoder located at a distance.

Avantageusement, les lumières de la plaque avant sont disposées suivant un ligne continue parallèle et à faible distance du bord de la boîte, l'axe de chaque ampoule passe sensiblement par le centre de la plaque et le centre d'une lumière.Advantageously, the lights of the front plate are arranged in a continuous parallel line and a short distance from the edge of the box, the axis of each bulb passes substantially through the center of the plate and the center of a light.

De préférence, le clavier est rigoureusement étanche et peut être immergé ; à cet effet les lumières de la plaque avant sont remplies d'un produit laissant passer le champ magnétique, tel qu'une résine, et la plaque avant est collée ou soudée de façon étanche sur le boîtier, de même que le câble est collé par de la résine dans son trou de sortie.Preferably, the keyboard is strictly waterproof and can be submerged; for this purpose the lights of the front plate are filled with a product allowing the magnetic field to pass through, such as a resin, and the front plate is glued or welded in a leaktight manner on the housing, just as the cable is glued by resin in its exit hole.

Avantageusement, le clavier est muni sur sa face avant d'une étiquette permettant le repérage des lumières et éventuellement leur numérotation. Par ailleurs, son épaisseur est réduite à l'épaisseur de l'ampoule augmentée de celle du boîtier et de la plaque avant.Advantageously, the keyboard is provided on its front face with a label allowing the location of the lights and possibly their numbering. Furthermore, its thickness is reduced to the thickness of the bulb increased by that of the housing and the front plate.

Un tel clavier peut être fixé sur la face arrière d'une vitre ou toute autre plaque non magnétique ; chaque ampoule est actionnable par une clef magnétique présentée sur la face avant de la vitre, au droit du repère correspondant figurant sur la vignette.Such a keyboard can be fixed on the rear face of a window or any other non-magnetic plate; each bulb can be activated by a magnetic key presented on the front of the glass, in line with the corresponding mark on the sticker.

La superficie des lumières de la plaque avant est adaptable à sa distance à la clef magnétique, par remplacement de la plaque avant, ou adjonction d'une plaque supplémentaire devant la plaque déjà existante, plaque supplémentaire fixe ou coulissante constituant un masque partiel, dont les lumières sont de diamètre moindre.The surface area of the lights on the front plate is adaptable to its distance from the magnetic key, by replacing the front plate, or adding an additional plate in front of the already existing plate, an additional fixed or sliding plate constituting a partial mask, the lights are of smaller diameter.

Pour mieux faire comprendre l'invention il est donné ci-après un exemple de réalisation en référence aux dessins annexés dans lesquels :

  • Fig. 1 est une vue de face en perspective sans vitre protectrice,
  • Fig. 2 est une coupe partielle suivant II-II de la Fig. 1,
  • Fig. 3 est une vue de dessus, la feuille indicatrice étant enlevée.
To better understand the invention, an exemplary embodiment is given below with reference to the appended drawings in which:
  • Fig. 1 is a front perspective view without protective glass,
  • Fig. 2 is a partial section along II-II of FIG. 1,
  • Fig. 3 is a top view, the indicator sheet being removed.

Le clavier est constitué par une boîte 1, de faible profondeur fermée par une plaque avant 2 comportant des lumières 3. De cette boîte 1, sort un câble 4 qui la relie à une autre boîte 5, contenant le dispositif codeur-décodeur.The keyboard consists of a box 1, of shallow depth closed by a front plate 2 comprising lights 3. From this box 1, a cable 4 comes out which connects it to another box 5, containing the coder-decoder device.

Dans l'exemple représenté, à l'intérieur du clavier sont fixées des ampoules 9 à 18, à deux lames sensibles au champ magnétique prolongée chacune par une patte 6 ou 7, sortant aux extrémités opposées. La Fig. 2 montre le corps de l'ampoule 9 disposé parallèlement sous la partie pleine de la plaque avant 2. Seule la patte 6 passe devant la lumière 3. La patte 6 est recourbée et les extrémités libres des deux pattes sont fixées a un circuit imprimé . Ce circuit peut être imprimé directement sur le fond 19 de la boîte 1, ou sur une plaque spéciale 8 fixée sur le dit fond de la boîte.In the example shown, inside the keyboard are attached bulbs 9 to 18, with two blades sensitive to the magnetic field each extended by a tab 6 or 7, coming out at opposite ends. Fig. 2 shows the body of the bulb 9 arranged parallel under the solid part of the front plate 2. Only the tab 6 passes in front of the light 3. The tab 6 is bent and the free ends of the two tabs are fixed to a printed circuit. This circuit can be printed directly on the bottom 19 of the box 1, or on a special plate 8 fixed on said bottom of the box.

Sur la face avant 2 est collée une feuille indicatrice 20 avec des chiffres, lettres ou autres, au-dessus des lumières 3. En plaçant un aimant 21 face à un repère et à une lumière 3, on transmet un flux magnétique à la patte 6 (et exclusivement à la patte 6) qui conduit ce flux à la lame lui faisant suite pour exciter le circuit de l'ampoule 9. Dès que l'aimant 21 est retiré, l'ampoule n'est plus excitée.On the front face 2 is pasted an indicator sheet 20 with numbers, letters or the like, above the lights 3. By placing a magnet 21 facing a mark and a light 3, a magnetic flux is transmitted to the tab 6 (and exclusively on lug 6) which conducts this flow to the blade following it to excite the circuit of the bulb 9. As soon as the magnet 21 is removed, the bulb is no longer energized.

La Fig. 3 montre que les ampoules 9 à 18 sont disposées radialement, chaque ampoule se trouve dans l'axe allant du centre de la boîte 1 au centre d'une lumière 3. Ainsi les lumières, placées à la périphérie, sont suffisament espacées malgré l'encombrement réduit de la boîte. Les pattes 7 non recourbées sont toutes dirigées vers le centre de la boîte. Le câble 4 sort de préférence de la boîte 1 par le centre du fond de la boîte.Fig. 3 shows that the bulbs 9 to 18 are arranged radially, each bulb is in the axis going from the center of the box 1 to the center of a light 3. Thus the lights, placed at the periphery, are sufficiently spaced despite the reduced size of the box. The non-curved tabs 7 are all directed towards the center of the box. The cable 4 preferably leaves the box 1 through the center of the bottom of the box.

Les ampoules étant placées horizontalement, on comprend que l'épaisseur externe de la boîte soit très faible, sa profondeur interne étant réduite n'a guère plus d'épaisseur que l'ampoule.The bulbs being placed horizontally, it is understood that the external thickness of the box is very small, its internal depth being reduced has little more thickness than the bulb.

Selon une autre forme de réalisation de l'invention, le clavier est rigoureusement étanche et peut être immergé. A cet effet, les lumières 3 de la plaque avant 2 sont remplies d'une résine (ou d'un autre produit) laissant passer le champ magnétique, et la plaque avant 2 est collée ou soudée de façon étanche sur le boîtier 1. De même le trou de sortie du câble 4 est obstrué par de la résine selon un mode préféré de fabrication.According to another embodiment of the invention, the keyboard is strictly waterproof and can be submerged. For this purpose, the lights 3 of the front plate 2 are filled with a resin (or another product) letting the magnetic field pass, and the front plate 2 is glued or welded in a leaktight manner on the housing 1. From even the outlet hole of the cable 4 is blocked with resin according to a preferred method of manufacture.

Le clavier tel que décrit est fixé ou appliqué sur la face arrière d'une vitre ou toute autre plaque non magnétique, et chaque ampoule est actionnable par un aimant présenté sur la face avant de la dite vitre, au droit du repère correspondant. La commande est transmise au codeur-décodeur 5 qui peut être éloigné du clavier. Le clavier est mince, cinq millimètres par exemple, et d'une faible surface, carrée de cinq centimètres de côté par exemple, aussi est-il facilement logeable, voir dissimulable à l'intérieur d'un immeuble ou d'un meuble.The keyboard as described is fixed or applied to the rear face of a window or any other non-magnetic plate, and each bulb is actuable by a magnet presented on the front face of said window, in line with the corresponding reference. The command is transmitted to the codec-decoder 5 which can be distant from the keyboard. The keyboard is thin, five millimeters for example, and of a small surface, square of five centimeters of side for example, so it is easily accommodatable, see concealable inside a building or a piece of furniture.

L'épaisseur de la vitre (ou de toute autre plaque non magnétique) est très différente suivant les cas d'utilisation, et le flux magnétique qui la traverse à une distance plus ou moins longue à parcourir en s'évasant plus ou moins. La surface utile de chaque lumière est adaptable à ce flux, et en fait réglable en fonction de de la distance qui le sépare de la clef magnétique. Cette adaptation peut être effectuée par différents moyens. Le moyen techniquement le plus simple consiste à enlever la plaque 2 et à la remplacer par une autre plaque extérieurement de même dimension, mais dont le diamètre des lumières est différent. On peut aussi conserver la plaque 2 existante et assujettir sur elle une autre plaque avec des lumières aux mêmes emplacements mais de diamètre plus faible.The thickness of the glass (or of any other non-magnetic plate) is very different depending on the use case, and the magnetic flux which crosses it at a more or less long distance to be traversed by widening more or less. The useful surface of each light is adaptable to this flow, and in fact adjustable according to the distance between it and the magnetic key. This adaptation can be carried out by various means. The technically simplest way is to remove the plate 2 and replace it with another plate externally of the same size, but the diameter of the lights is different. We can also keep the existing plate 2 and fix another plate on it with lights in the same locations but with a smaller diameter.

L'installateur peut avoir à sa disposition un jeu de plaques variées, dont le diamètre des lumières est différent selon la catégorie de la plaque, et choisir au moment du montage une plaque de la catégorie la mieux appropriée à la distance prévue entre l'ampoule 9 et l'aimant 21, que ce soit dans le cas du remplacement de la plaque 2 ou dans le cas de l'adjonction d'une plaque supplémentaire.The installer can have at his disposal a set of various plates, the diameter of the lights of which differs according to the category of the plate, and choose at the time of assembly a plate of the category most appropriate for the distance between the bulb. 9 and the magnet 21, whether in the case of the replacement of the plate 2 or in the case of the addition of an additional plate.

Claims (9)

  1. An electric or electronic control keyboard comprising a case (1), a front closure plate (2) not allowing the passage of a magnetic flux emitted by a magnet or magnetic key except at sites of holes (3) provided for this purpose, a magnetic switch (9 to 18) with connectors (6,7), by a hole being placed in the case (1) parallel and level with the front plate (2) so as to detect the flux passing through said hole (3), a printed circuit (19) in the bottom of the case (1) and to which the magnetic switchs (9 to 18) are connected, which keyboard is characterised in that a connector (6) of each magnetic switch (9 to 18) is arranged beneath the corresponding hole (3), whilst the body of the magnetic switch with the other connector (7) are placed beneath the solid part of the front plate (2).
  2. A keyboard according to Claim 1, characterised in that the connector (6) placed beneath the hole (3) is bent back in a plane parallel to the front plate (2).
  3. A keyboard according to all of the preceding claims, characterised in that a cable (4) leaves laterally or through the rear face of the case (1) to connect it to a decoder (5) situated at a distance.
  4. A keyboard according to any one of the preceding claims, characterised in that the holes (3) of the front plate (2) are arranged following an imaginary continuous line parallel to and at a small distance from the edge of the case, the axis of each magnetic switch passes substantially through the centre of the plate and the centre of a hole.
  5. A keyboard according to any one of Claims 3 to 4, characterised in that the keyboard is strictly impervious and can be immersed and that to this effect the holes (3) of the front plate (2) are filled with a product allowing the magnetic field to pass, such as a resin, and that the front plate (2) is secured in a tight manner on the case (1), in the same way as the cable (4) is secured by resin in its outlet hole.
  6. A keyboard according to any one of the preceding claims, characterised in that it is provided on its front face (2) with a label (20) permitting the marking of the holes (3) and possibly their numbering.
  7. A keyboard according to any one of the preceding claims, characterised in that its thickness is small and reduced to the thickness of the magnetic switch (9) increased by that of the case (1) and of the front plate (2).
  8. A keyboard according to any one of the preceding claims, characterised in that it is fixed on the rear face of a pane of glass or any other non-magnetic plate, and that each magnetic switch (9) is actionable by a magnetic key (21) presented on the front face of said pane of glass, in line with the corresponding mark appearing on the vignette (20).
  9. A keyboard according to Claim 8, characterised in that the area of the holes (3) of the front plate is adaptable to its distance from the magnetic key (21), by replacement of said front plate, or the adjoining of a supplementary plate in front of the plate already existing, the fixed or sliding supplementary plate constituting a partial mask, the holes of which are of smaller diameter.
EP88905210A 1988-06-03 1988-06-03 Electric or electronic control keyboard Expired - Lifetime EP0376949B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88905210T ATE116475T1 (en) 1988-06-03 1988-06-03 ELECTRICAL OR ELECTRONIC CONTROL KEYPAD.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR1988/000280 WO1989012310A1 (en) 1988-06-03 1988-06-03 Electric or electronic control keyboard

Publications (2)

Publication Number Publication Date
EP0376949A1 EP0376949A1 (en) 1990-07-11
EP0376949B1 true EP0376949B1 (en) 1994-12-28

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EP88905210A Expired - Lifetime EP0376949B1 (en) 1988-06-03 1988-06-03 Electric or electronic control keyboard

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US (1) US5063478A (en)
EP (1) EP0376949B1 (en)
JP (1) JPH02504567A (en)
DE (1) DE3852644T2 (en)
WO (1) WO1989012310A1 (en)

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FR2855318A1 (en) * 2003-05-23 2004-11-26 Acrelec Sas Magnetic contact activation and control method for six digit digital-coding keyboard, involves placing magnet on wall under which dissimilar magnetic control contacts are placed
WO2006051123A1 (en) * 2004-09-30 2006-05-18 Investigación Y Transferencia De Tecnología, S.L. Control system for activation of an electric circuit

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FR2438907A1 (en) * 1978-10-09 1980-05-09 Franqueville Philippe Magnetically controlled knife-switch - allows easy concealment and reduces possibility of tampering by positioning switch contacts and magnetic control in axial alignment
US4336529A (en) * 1980-02-19 1982-06-22 Pitney Bowes Inc. Postage meter having shielded keyboard to protect against electromagnetic radiation
US4380704A (en) * 1980-04-28 1983-04-19 Wisda Michael S Electrical switch
EP0204050B1 (en) * 1985-05-31 1990-03-28 Bernard Danglot Electric or electronic control keyboards

Also Published As

Publication number Publication date
JPH02504567A (en) 1990-12-20
DE3852644D1 (en) 1995-02-09
EP0376949A1 (en) 1990-07-11
WO1989012310A1 (en) 1989-12-14
US5063478A (en) 1991-11-05
DE3852644T2 (en) 1995-08-03

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