EP0139581B1 - Fuse devices particularly suitable for being mounted on printed-circuit cards - Google Patents

Fuse devices particularly suitable for being mounted on printed-circuit cards Download PDF

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Publication number
EP0139581B1
EP0139581B1 EP84402000A EP84402000A EP0139581B1 EP 0139581 B1 EP0139581 B1 EP 0139581B1 EP 84402000 A EP84402000 A EP 84402000A EP 84402000 A EP84402000 A EP 84402000A EP 0139581 B1 EP0139581 B1 EP 0139581B1
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EP
European Patent Office
Prior art keywords
pair
slide
pegs
base
spring
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
EP84402000A
Other languages
German (de)
French (fr)
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EP0139581A2 (en
EP0139581A3 (en
Inventor
Guy Rotbart
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.)
CEHESS TECHNOLOGIES
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CEHESS TECHNOLOGIES
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from FR8316683A external-priority patent/FR2553933B1/en
Priority claimed from FR8414836A external-priority patent/FR2570874A2/en
Application filed by CEHESS TECHNOLOGIES filed Critical CEHESS TECHNOLOGIES
Publication of EP0139581A2 publication Critical patent/EP0139581A2/en
Publication of EP0139581A3 publication Critical patent/EP0139581A3/en
Application granted granted Critical
Publication of EP0139581B1 publication Critical patent/EP0139581B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/30—Means for indicating condition of fuse structurally associated with the fuse
    • H01H85/303—Movable indicating elements
    • H01H85/306—Movable indicating elements acting on an auxiliary switch or contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H01H2085/0275—Structural association with a printed circuit board

Definitions

  • the present invention relates to fusible devices, in particular those which are intended to be mounted on printed circuit boards, for the protection of the electrical and electronic components which equip them, and which are of the disposable type (one way).
  • fuses used for printed circuit boards are those shown, for example, in Figures 1 and 2.
  • the conductive tracks 1 and 2 provided on the insulating support 3 are welded, the wires 4 and 5 welded respectively on the covers 6 and 7 covering the ends of the tube 8 in which the welded fusible wire is housed by its end to the covers.
  • This fuse is not only fragile, but it generally comprises an opaque tube 8, so that the melting of the fusible wire is not visible.
  • This tube 8 With a transparent material, but this would only allow it to be searched with a great deal of pain and loss of time.
  • the tube 8 with fusible wire mounted between the covers 6 and 7 is housed in a cartridge 9, the bottom 10 of which has a conductive inner wall carrying the wire 5 is to be welded to the conductive track 1, while in the other end of the cartridge 9 is screwed a plug 11 in a thread 12 of a conductive part 13 to which is fixed the wire 4 to be welded to the track 2 support 3.
  • This device has the drawback of the previous one and, moreover, it is bulky.
  • Such a device has the drawback that the electrical contact between the contact blade and the second pair of pins is poorly ensured because the spring of the cursor, after the melting of the fusible wire, is relaxed and exerts only a relatively weak force. on the blade.
  • the second pair of pins because it is not secured to the body, is not usually changed each time the device is changed and this results in wear of the contact and a degradation of its quality. From this arrangement, it can also result in poor contact of the blade on the second pair of pins in the event that the first pair of pins is incorrectly inserted in the corresponding sockets.
  • this safety device of the prior art does not include an external display means which indicates that the fuse has blown, which makes it difficult to locate on a printed circuit board which comprises several devices of this type.
  • the object of the present invention is therefore to produce a fuse safety device for printed circuit boards which does not have the aforementioned drawbacks and which therefore makes it possible, on the one hand, to obtain and maintain good mechanical and electrical contact between the contact blade and the second pair of pins connected to the signaling circuit and, on the other hand, to signal on the printed circuit board the specific fuse which worked by the melting of its wire.
  • said means comprising a contact device carried by the cursor and having substantially the shape of a U whose vertical branch extends transversely to the trajectory of the cursor is flexible and constitutes the contact blade, whose bottom or transverse branch of the U is provided with an opening serving for the passage of a stud of the slider and is provided with two flexible lateral tabs, the slider pin is guided in a groove made in the base and the two lateral tabs arranged on either side of said opening are guided in two other lateral grooves of the base.
  • the user can immediately identify the defective card, and by the means indicated below, identify on the defective card, the defective fuse.
  • notches which block the two lateral tongues of the contact device when the contact blade comes to bear against the second pair of pins, in a curved position between them.
  • the flexible blade which constitutes the contact blade carries a frontal steel plate in front of a permanent magnet carried by the base, between the second pair of dowels and against which the steel plate comes to stick. , at the fusion of the wire, by bending between these pins under the action of the relaxed spring.
  • said means for blocking the blade associated with the cursor, in the position in which it establishes the electrical connection between said second pair of dowels are constituted by a second spring distinct from that which is intended for propulsion of the cursor at the melting of the fusible wire and acting in a direction which is perpendicular to the direction of the action of said propulsion spring of the cursor, said blade being moved into its curved position between said second pair of pins, under the action of said second spring, the removal of a locking mechanism involved in the melting of the fuse wire.
  • said locking means comprise a cage with blade guide slots held in its position separated from said second pair of pins, with arming of the second spring, by two balls locked on a chamfer of the cage by an underlying piston associated with the cursor and adapted to disengage from the balls when the fusible wire melts when the cursor propulsion spring is released.
  • the various embodiments and their variants which have just been succinctly described may also include means for protecting the device from the external environment and signaling on the printed circuit board the specific fuse which has worked.
  • the cursor preferably made of a ceramic material, comprises a projecting part of prismatic shape with convex front surface, over which the fusible wire passes, a spring being armed between the face opposite to the previous one and a corresponding part of the base.
  • the base has a wall identical to that against which the spring bears, the assembly of these two walls serving for the fitting of a cover plate serving for closing the safety device, the assembly being capped with a cover engaged by friction.
  • the device of the invention is arranged so that the closure plate as well as the cover, respectively comprise an opening which is located in line with the projecting part of the cursor allowing the observation of the latter when the cursor is in its position armed by the fuse wire.
  • the device according to the invention is produced with a molded plastic base of square shape and of small dimension, for example of the order of 10 mm, its height being 7 mm, for pins 4 mm long.
  • Figure 6 shows schematically, with partial section of the cursor, a plan view, cover removed from the device of the invention using magnetic means for locking the flexible blade against the second pair of pins.
  • Figure 7 is a schematic plan view, cover removed from the device of the invention implementing said second spring for the blocking of the flexible blade against the second pegs.
  • Figure 8 is a section of Figure 7 along line III-III without hatching for the cut elements.
  • the reference 14 designates the base of the device which is a piece of molded plastic material provided with a first pair of pins 15 and 16, as well as a second pair of pins 17 and 18, these pins being molded in the mass of plastic material and being intended to be pressed into corresponding sockets provided at the level of the conductive tracks concerned of a printed circuit board, or to be soldered directly on the tracks of the circuit to be checked.
  • Pins 15, 16, 17 and 18 are continued in the upper face of the base by pins respectively designated by 19, 20, 21 and 22.
  • This slider 25 is a ceramic piece comprising a bottom 26 provided with a vertical wall element 27 with a convex front face 28 and with a flat inner face 29, and, at a certain distance from this, the bottom 26 carries a block of general prismatic appearance, the front face 31 of which is concave.
  • a contact element shown in FIG. 3 A and designated by the general reference 32 is secured to the cursor.
  • This contact element made of a material which is good conductor of electricity has the general shape of a U.
  • One, 33, of the branches of the contact element 32 constitutes a contact blade whose flexibility is increased by two grooves 34 and 35 formed at the elbow formed with the bottom or transverse branch 36 of the contact element 32.
  • the contact element 32 is adapted to be fixed to the cursor 25, as shown in FIG. 3, which cursor 25 has in the lower face of its bottom 26 a non-visible stud, which passes through the bore 39 of the branch transverse 36 of the contact element and is engaged in a central groove 42 formed in the upper face of the base 14, two other lateral grooves 43 and 44 arranged on either side of the groove 42, serving to guide the side tabs 40 and 41.
  • the cursor 25 can either be disposed between the contact blade 33 of the contact element 32 and its second branch 39, or the latter can come to be housed in a slot, not shown, formed in the cursor 25, preferably at the during its manufacture.
  • grooves 43 and 44 respectively comprise stop notches 44 and 47 located at a certain distance from the pins 21 and 22, as will be explained with regard to the operating mode described below, after having noted that a spring 48 , preferably helical, is provided between the rear face of the slider 25 and the wall element 23.
  • the closing plate 49 ' On the vertical walls 23 and 24 is fixed the closing plate 49 ', preferably made with a ceramic, and provided with an opening 50 which is located in line with the prismatic boss 30 when the latter is in its position shown in FIG. 3, this plate closing the cut-off device of the invention to prevent the possible passage of an arc which could occur during cut-off, while the assembly thus closed is capped with a cover 51 (FIG. 4) made of molded plastic and comprising an opening 52 situated in line with the opening 50 of the closing plate 49 '.
  • a fusible wire 49 of the single or multi-wire type is welded to the pins 19 and 20 passing over the concave face 31 of the prismatic block 30, thus retaining the cursor 25 in a first position in which the spring 48 is compressed.
  • the cursor 25 is propelled by the spring 48 towards the pins 21 and 22 while being guided in the grooves 42, 43 and 44 by the stud not shown and by the tabs 40 and 41 which protrude from the stop notches 46 and 47 after the contact blade 33 comes to bear against the pins 21, 22, bringing them together electrically and thus completing the circuit of the conductive track with a signaling circuit optical or audible or command of a relay authorizing a cut-off or any other command or control function.
  • the contact blade 33 curves between the latter to ensure good contact which is maintained by the catch notches 46 and 47 which oppose any return of the contact blade 33 in a flat position.
  • the prismatic boss 30 which can carry a green patch is visible through the openings 50 and 52, the melting of the wire 49 can be identified by the absence of said boss 30 at these openings.
  • the reference 14 designates the base made of insulating material, the base in which the cursor 25 is provided.
  • This is a ceramic part comprising a bottom 26 provided with an element of vertical walls 27 with a front face 28 and an internal face 29, and, at a certain distance from this, the bottom 26 carries a prismatic block whose the front face 31 is concave.
  • the fusible wire 49 passes on this concave front face 31 and it is hooked to the first pair of pins 19 and 20, by arming the spring 48 housed in a cavity 101 of the slider 25 and bearing against a fixed stop 102 carried by the base 14 (see fig. 6).
  • a flexible blade 103 to the middle part of which is fixed by screws or rivets 104 and 105, a plate of steel 106, while opposite it, the base 14 carries a permanent magnet 107 located between the second pair of pins 21 and 22.
  • chamfers On these chamfers are arranged two balls 122 and 123 located on either side of the axial rod 113 associated with the slider, the mounting of the chamfer, the diameters of the balls and the cross section of the axial rod being chosen so that the balls 122 and 123 can only fall into the underlying cavity 121 when the axial rod 113 at least partially emerges from the second chamber.
  • the cage 111 has in its side walls two slots 124 and 125 which serve as guides for the flexible blade 126 made with an electrically conductive material and extending above the pins 21 and 22 in the portion shown in FIG. 3 , by being applied against the balls 122 and 123 by a compression spring 127 which, moreover, bears against the bottom of the cover 128 of the device.
  • the cursor 25 is propelled towards a stop 129 carried by the base 14, under the action of the spring 112 which relaxes and which drives the piston 114 and its axial rod 113.
  • the second spring 127 expands by lowering the flexible blade 126 which comes to bear on the pins 21 and 22, bulging between them under the effect of the force exerted by said second spring 127.
  • these two pins 21 and 22 are part of a circuit for signaling the melting of fusible wire, so that the user can quickly identify the faulty circuit breaker device and replace it with a new one.

Description

La présente invention concerne les dispositifs fusibles, notamment ceux qui sont destinés à être montés sur des cartes à circuits imprimés, en vue de la protection des composants électriques et électroniques qui équipent ces dernières, et qui sont du type jetable (one way).The present invention relates to fusible devices, in particular those which are intended to be mounted on printed circuit boards, for the protection of the electrical and electronic components which equip them, and which are of the disposable type (one way).

L'utilisation sans cesse croissante de ces cartes à circuits imprimés va de paire avec le souhait d'une identification rapide et sûre, non seulement de la carte à circuits imprimés, mais du fusible d'une carte dont le fil fusible a fonctionné en tant que protection, par la fusion du fil calibré. De plus, et en raison même de leur utilisation sur des cartes à circuits imprimés, les fusibles doivent être d'un faible encombrement et même d'un faible volume pour permettre le montage, côte à côte, de plusieurs cartes à circuits imprimés.The ever-increasing use of these printed circuit boards goes hand in hand with the desire for rapid and secure identification, not only of the printed circuit board, but of the fuse of a card of which the fuse wire has functioned as that protection, by the fusion of the calibrated wire. In addition, and due to their very use on printed circuit boards, fuses must be compact and even of a small volume to allow the mounting, side by side, of several printed circuit boards.

Actuellement, les fusibles utilisés pour des cartes à circuits imprimés sont ceux qui sont représentés, à titre d'exemple, dans les figures 1 et 2.Currently, the fuses used for printed circuit boards are those shown, for example, in Figures 1 and 2.

Dans le cas de la figure 1, on soude aux pistes conductrices 1 et 2 prévues sur le support isolant 3, les fils 4 et 5 soudés respectivement sur les capots 6 et 7 coiffant les extrémités du tube 8 dans lequel est logé le fil fusible soudé par son extrémité aux capots.In the case of FIG. 1, the conductive tracks 1 and 2 provided on the insulating support 3 are welded, the wires 4 and 5 welded respectively on the covers 6 and 7 covering the ends of the tube 8 in which the welded fusible wire is housed by its end to the covers.

Ce fusible est non seulement fragile, mais il comporte en général un tube 8 opaque, en sorte que la fusion du fil fusible n'est pas visible. On pourrait imaginer de réaliser ledit tube 8 avec une matière transparente, mais cela ne permettrait sa recherche qu'avec beaucoup de peine et de perte de temps.This fuse is not only fragile, but it generally comprises an opaque tube 8, so that the melting of the fusible wire is not visible. One could imagine making said tube 8 with a transparent material, but this would only allow it to be searched with a great deal of pain and loss of time.

Les mêmes difficultés s'attachent au fusible dit à cartouche représenté dans la figure 2. Dans cette réalisation, le tube 8 à fil fusible monté entre les capots 6 et 7 est logé dans une cartouche 9 dont le fond 10 à paroi intérieure conductrice portant le fil 5 est à souder à la piste conductrice 1, alors que dans l'autre extrémité de la cartouche 9 est vissé un bouchon 11 dans un filetage 12 d'une pièce conductrice 13 à laquelle est fixé le fil 4 à souder à la piste 2 du support 3.The same difficulties attach to the so-called cartridge fuse shown in FIG. 2. In this embodiment, the tube 8 with fusible wire mounted between the covers 6 and 7 is housed in a cartridge 9, the bottom 10 of which has a conductive inner wall carrying the wire 5 is to be welded to the conductive track 1, while in the other end of the cartridge 9 is screwed a plug 11 in a thread 12 of a conductive part 13 to which is fixed the wire 4 to be welded to the track 2 support 3.

Ce dispositif présente l'inconvénient du précédent et, de plus, il est volumineux.This device has the drawback of the previous one and, moreover, it is bulky.

Le brevet US-A-3 437 972 décrit un dispositif de sécurité à fusible mono ou multifilaire, destiné à être enfiché, qui comporte:

  • - un corps en une matière isolante,
  • - une première paire de broches portée par l'embase dont une extrémité est destinée à être enfichée dans une première paire de douilles correspondantes connectées à un circuit à protéger, et dont l'autre extrémité est destinée à la fixation du fil fusible,
  • - une seconde paire de broches constituant une seconde paire de douilles connectées à un circuit de signalisation, ladite seconde paire de broches n'étant pas solidaire du corps,
  • - un curseur capable d'être retenu dans une première position par le fil fusible, avec armement d'un ressort exerçant sur le curseur une force de propulsion en direction de la seconde paire de broches,
  • - des moyens de guidage prévus dans le corps pour guider le déplacement du curseur, et
  • - une lame de contact associée au curseur et capable de contacter la seconde paire de broches, après fusion du fil fusible.
US-A-3,437,972 describes a safety device with a single or multi-wire fuse, intended to be plugged in, which comprises:
  • - a body of insulating material,
  • a first pair of pins carried by the base, one end of which is intended to be inserted into a first pair of corresponding sockets connected to a circuit to be protected, and the other end of which is intended for fixing the fuse wire,
  • a second pair of pins constituting a second pair of sockets connected to a signaling circuit, said second pair of pins not being secured to the body,
  • - a cursor capable of being retained in a first position by the fusible wire, with arming of a spring exerting on the cursor a propelling force in the direction of the second pair of pins,
  • guide means provided in the body to guide the movement of the cursor, and
  • - a contact blade associated with the cursor and capable of contacting the second pair of pins, after fusion of the fusible wire.

Avec un tel dispostif après fusion du fil fusible, le curseur et avec lui la lame de contact se déplacent vers la seconde paire de broches jusqu'au moment ou la lame de contact rencontre la seconde paire de broches, ce qui active le circuit de signalisation.With such a device after fusion of the fusible wire, the cursor and with it the contact blade move towards the second pair of pins until the contact blade meets the second pair of pins, which activates the signaling circuit .

Un tel dispositif présente l'inconvénient que le contact électrique entre la lame de contact et la seconde paire de broches est mal assuré car le ressort du curseur, après la fusion du fil fusible, est détendu et n'exerce qu'une force relativement faible sur la lame.Such a device has the drawback that the electrical contact between the contact blade and the second pair of pins is poorly ensured because the spring of the cursor, after the melting of the fusible wire, is relaxed and exerts only a relatively weak force. on the blade.

Il présente aussi l'inconvénient que la seconde paire de broches, du fait qu'elle n'est pas solidaire du corps, n'est pas habituellement changée à chaque fois que l'on change le dispositif et il en résulte une usure du contact et une dégradation de sa qualité. De cette disposition, il peut aussi en résulter un mauvais contact de la lame sur la seconde paire de broches au cas où la première paire de broches est mal enfichée dans les douilles correspondantes.It also has the disadvantage that the second pair of pins, because it is not secured to the body, is not usually changed each time the device is changed and this results in wear of the contact and a degradation of its quality. From this arrangement, it can also result in poor contact of the blade on the second pair of pins in the event that the first pair of pins is incorrectly inserted in the corresponding sockets.

En outre, ce dispositif de sécurité de l'art antérieur ne comporte pas un moyen de visualisation externe qui indique que le fusible a fondu, ce qui rend difficile son repérage sur une carte à circuits imprimés qui comporte plusieurs dispositifs de ce type.In addition, this safety device of the prior art does not include an external display means which indicates that the fuse has blown, which makes it difficult to locate on a printed circuit board which comprises several devices of this type.

Le but de la présente invention est donc de réaliser un dispositif de sécurité à fusible pour cartes à circuits imprimés qui ne présente pas les inconvénients précités et qui permet donc, d'une part, d'obtenir et maintenir un bon contact mécanique et électrique entre la lame de contact et la seconde paire de broches connectée au circuit de signalisation et, d'autre part, de signaler sur la carte à circuits imprimés le fusible spécifique qui a fonctionné par la fusion de son fil.The object of the present invention is therefore to produce a fuse safety device for printed circuit boards which does not have the aforementioned drawbacks and which therefore makes it possible, on the one hand, to obtain and maintain good mechanical and electrical contact between the contact blade and the second pair of pins connected to the signaling circuit and, on the other hand, to signal on the printed circuit board the specific fuse which worked by the melting of its wire.

L'objet de l'invention est donc un dispositif de sécurité à fusible mono ou multifilaire, en particulier pour des cartes à circuits imprimés dans lesquelles il est destiné à être enfiché, qui comprend:

  • a) une embase en matière isolante,
  • b) une première paire de broches destinée à être enfichée dans des douilles correspondantes prévues au niveau du circuit à protéger, ou à être soudée à celui-ci, se poursuivant par une première paire de chevilles en saillie sur l'autre face de l'embase et destinée à la fixation, par exemple par soudure, du fil fusible,
  • c) une seconde paire de chevilles connectée à un circuit de signalisation,
  • d) un curseur capable d'être retenu dans une première position voisine de la première paire de chevilles par le fil fusible, avec armement d'un ressort exerçant sur le curseur une force de propulsion en direction de la seconde paire de chevilles,
  • e) des moyens de guidage prévus dans l'embase pour guider le déplacement du curseur,
  • f) une lame de contact associée au curseur et capable de contacter la seconde paire de chevilles, après fusion du fil fusible,
The object of the invention is therefore a safety device with a single or multi-wire fuse, in particular for printed circuit boards in which it is intended to be inserted, which comprises:
  • a) a base made of insulating material,
  • b) a first pair of pins intended to be plugged into corresponding sockets provided at the level of the circuit to be protected, or to be soldered thereto, continuing with a first pair of dowels projecting from the other side of the base and intended for fixing, for example by welding, the fusible wire
  • c) a second pair of plugs connected to a signaling circuit,
  • d) a cursor capable of being retained in a first position close to the first pair of pins by the fusible wire, with arming of a spring exerting on the cursor a propelling force towards the second pair of pins,
  • e) guide means provided in the base to guide the movement of the cursor,
  • f) a contact blade associated with the cursor and capable of contacting the second pair of pins, after fusion of the fusible wire,

caractérisé par le fait qu'il comporte des moyens associés au curseur et à l'embase pour assurer entre la lame de contact et la seconde paire de chevilles un bon contact sans rebondissements, lesdits moyens comprenant un dispositif de contact porté par le curseur et ayant sensiblement la forme d'un U dont une branche verticale s'étend transversalement à la trajectoire du curseur est flexible et constitue la lame de contact, dont le fond ou branche transversale du U est pourvu d'une ouverture servant au passage d'un téton du curseur et est pourvu de deux languettes latérales flexibles, le téton du curseur est guidé dans une rainure ménagée dans l'embase et les deux languettes latérales disposées de part et d'autre de ladite ouverture sont guidées dans deux autres rainures latérales de l'embase.characterized by the fact that it comprises means associated with the cursor and the base for ensuring good contact between the contact blade and the second pair of pins without bouncing, said means comprising a contact device carried by the cursor and having substantially the shape of a U whose vertical branch extends transversely to the trajectory of the cursor is flexible and constitutes the contact blade, whose bottom or transverse branch of the U is provided with an opening serving for the passage of a stud of the slider and is provided with two flexible lateral tabs, the slider pin is guided in a groove made in the base and the two lateral tabs arranged on either side of said opening are guided in two other lateral grooves of the base.

Comme cette seconde paire de chevilles est située dans un circuit de signalisation optique ou sonore, l'utilisateur peut immédiatement identifier la carte défectueuse, et par des moyens indiqués ci-dessous, identifier sur la carte défectueuse, le fusible défectueux.As this second pair of pins is located in an optical or audible signaling circuit, the user can immediately identify the defective card, and by the means indicated below, identify on the defective card, the defective fuse.

Suivant une variante, dans les gorges latérales sont prévus des crans d'arrêt qui bloquent les deux languettes latérales du dispositif de contact lorsque la lame de contact vient porter contre la seconde paire de chevilles, dans une position incurvée entre celles-ci.According to a variant, in the lateral grooves are provided notches which block the two lateral tongues of the contact device when the contact blade comes to bear against the second pair of pins, in a curved position between them.

Suivant une variante, la lame flexible qui constitue la lame de contact porte une plaquette d'acier frontale en face d'un aimant permanent porté par l'embase, entre la seconde paire de chevilles et contre lequel vient se coller la plaquette d'acier, à la fusion du fil, en s'incurvant entre ces chevilles sous l'action du ressort détendu.According to a variant, the flexible blade which constitutes the contact blade carries a frontal steel plate in front of a permanent magnet carried by the base, between the second pair of dowels and against which the steel plate comes to stick. , at the fusion of the wire, by bending between these pins under the action of the relaxed spring.

Suivant une autre forme de réalisation, lesdits moyens de blocage de la lame associée au curseur, dans la position dans laquelle elle établit la liaison électrique entre ladite seconde paire de chevilles, sont constitués par un second ressort distinct de celui qui est prévu pour la propulsion du curseur à la fusion du fil fusible et agissant suivant une direction qui est perpendiculaire à la direction de l'action dudit ressort de propulsion du curseur, ladite lame étant déplacée dans sa position incurvée entre ladite seconde paire de chevilles, sous l'action dudit second ressort, à la suppression d'un mécanisme de verrouillage intervenant à la fusion du fil fusible.According to another embodiment, said means for blocking the blade associated with the cursor, in the position in which it establishes the electrical connection between said second pair of dowels, are constituted by a second spring distinct from that which is intended for propulsion of the cursor at the melting of the fusible wire and acting in a direction which is perpendicular to the direction of the action of said propulsion spring of the cursor, said blade being moved into its curved position between said second pair of pins, under the action of said second spring, the removal of a locking mechanism involved in the melting of the fuse wire.

Suivant une variante de cette dernière forme de réalisation, lesdits moyens de blocage comportent une cage à fentes de guidage de la lame maintenue dans sa position écartée de ladite seconde paire de chevilles, avec armement du second ressort, par deux billes bloquées sur un chanfrein de la cage par un piston sous-jacent associé au curseur et adapté à se dégager des billes à la fusion du fil fusible lors de la détente du ressort de propulsion du curseur.According to a variant of this latter embodiment, said locking means comprise a cage with blade guide slots held in its position separated from said second pair of pins, with arming of the second spring, by two balls locked on a chamfer of the cage by an underlying piston associated with the cursor and adapted to disengage from the balls when the fusible wire melts when the cursor propulsion spring is released.

Les différentes formes de réalisation et leurs variantes qui viennent d'être succinctement décrites peuvent.comprendre, en outre, des moyens pour protéger le dispositif de l'environnement extérieur et signaler sur la carte à circuits imprimés le fusible spécifique qui a fonctionné.The various embodiments and their variants which have just been succinctly described may also include means for protecting the device from the external environment and signaling on the printed circuit board the specific fuse which has worked.

A cet effet, le curseur, réalisé de préférence en une matière céramique, comporte une partie saillante de forme prismatique à surface frontale convexe, sur laquelle passe le fil fusible, un ressort étant armé entre la face opposée à la précédente et une partie correspondante de l'embase. Par ailleurs, l'embase comporte une paroi identique à celle contre laquelle porte le ressort, l'ensemble de ces deux parois servant à la mise en place d'une plaque de couverture servant à la fermeture du dispositif de sécurité, l'ensemble étant coiffé d'un capot engagé par friction.To this end, the cursor, preferably made of a ceramic material, comprises a projecting part of prismatic shape with convex front surface, over which the fusible wire passes, a spring being armed between the face opposite to the previous one and a corresponding part of the base. Furthermore, the base has a wall identical to that against which the spring bears, the assembly of these two walls serving for the fitting of a cover plate serving for closing the safety device, the assembly being capped with a cover engaged by friction.

En outre, le dispositif de l'invention est agencé de manière que la plaque de fermeture ainsi que le capot, comportent respectivement une ouverture qui se situe au droit de la partie saillante du curseur permettant l'observation de ce dernier lorsque le curseur est dans sa position armée par le fil fusible.In addition, the device of the invention is arranged so that the closure plate as well as the cover, respectively comprise an opening which is located in line with the projecting part of the cursor allowing the observation of the latter when the cursor is in its position armed by the fuse wire.

Le dispositif selon l'invention est réalisé avec une embase en matière plastique moulée de forme carrée et de faible dimension, par exemple de l'ordre de 10 mm, sa hauteur étant de 7 mm, pour des broches longues de 4 mm.The device according to the invention is produced with a molded plastic base of square shape and of small dimension, for example of the order of 10 mm, its height being 7 mm, for pins 4 mm long.

A titre d'exemple on a décrit ci-dessous et représenté au dessin annexé, une forme de réalisation du dispositif uniforme à l'invention. Dans le dessin,

  • - Les figures 1 et 2 représentent les deux dispositifs déjà décrits ci-dessus au titre de l'état de la technique.
  • - La figure 3 est une vue en perspective du dispositif selon l'invention, montrant les éléments liés à l'embase.
  • - La figure 3 A représente en perspective l'élément de contact.
  • - La figure 4 représente le couvercle destiné à coiffer le dispositif de la figure 3.
  • - La figure 5 est une vue en perspective du capot venant s'emboîter sur l'embase.
By way of example, an embodiment of the device uniform with the invention has been described below and shown in the appended drawing. In the drawing,
  • - Figures 1 and 2 show the two devices already described above under the state of the art.
  • - Figure 3 is a perspective view of the device according to the invention, showing the elements related to the base.
  • - Figure 3 A shows in perspective the contact element.
  • FIG. 4 represents the cover intended to cover the device of FIG. 3.
  • - Figure 5 is a perspective view of the cover fitting onto the base.

La figure 6 montre schématiquement, avec coupe partielle du curseur, une vue en plan, couvercle enlevé du dispositif de l'invention mettant en oeuvre des moyens magnétiques de blocage de la lame flexible contre la seconde paire de chevilles.Figure 6 shows schematically, with partial section of the cursor, a plan view, cover removed from the device of the invention using magnetic means for locking the flexible blade against the second pair of pins.

La figure 7 est une vue en plan schématique, couvercle enlevé du dispositif de l'invention mettant en oeuvre ledit second ressort pour le blocage de la lame flexible contre les secondes chevilles.Figure 7 is a schematic plan view, cover removed from the device of the invention implementing said second spring for the blocking of the flexible blade against the second pegs.

La figure 8 est une coupe de la figure 7 selon la ligne III-III sans hachures pour les éléments coupés.Figure 8 is a section of Figure 7 along line III-III without hatching for the cut elements.

Dans la figure 3, la référence 14 désigne l'embase du dispositif qui est une pièce en une matière plastique moulée pourvue d'une première paire de broches 15 et 16, ainsi que d'une seconde paire de broches 17 et 18, ces broches étant prises de moulage dans la masse de matière plastique et étant destinées à être enfoncées dans des douilles correspondantes prévues au niveau de pistes conductrices concernées d'une carte à circuits imprimés, ou à être soudées directement sur les pistes du circuit à contrôler.In FIG. 3, the reference 14 designates the base of the device which is a piece of molded plastic material provided with a first pair of pins 15 and 16, as well as a second pair of pins 17 and 18, these pins being molded in the mass of plastic material and being intended to be pressed into corresponding sockets provided at the level of the conductive tracks concerned of a printed circuit board, or to be soldered directly on the tracks of the circuit to be checked.

Les broches 15, 16, 17 et 18 se poursuivent dans la face supérieure de l'embase par des chevilles respectivement désignées par 19, 20, 21 et 22.Pins 15, 16, 17 and 18 are continued in the upper face of the base by pins respectively designated by 19, 20, 21 and 22.

Sur la face supérieure de l'embase 14 sont prévus deux éléments de paroi verticaux 23 et 24, situés respectivement entre les paires de chevilles 19,20,21 et 22, et légèrement au-delà des plans passant par les axes de ces paires de chevilles.On the upper face of the base 14 are provided two vertical wall elements 23 and 24, located respectively between the pairs of pins 19, 20, 21 and 22, and slightly beyond the planes passing through the axes of these pairs of ankles.

Entre ces éléments de paroi 23 et 24 est disposé un curseur désigné par la référence générale 25.Between these wall elements 23 and 24 is disposed a cursor designated by the general reference 25.

Ce curseur 25 est une pièce en céramique comportant un fond 26 pourvu d'un élément de paroi vertical 27 à face frontale 28 convexe et à face intérieure plane 29, et, à une certaine distance de celle-ci, le fond 26 porte un bloc d'allure générale prismatique dont la face frontale 31 est concave.This slider 25 is a ceramic piece comprising a bottom 26 provided with a vertical wall element 27 with a convex front face 28 and with a flat inner face 29, and, at a certain distance from this, the bottom 26 carries a block of general prismatic appearance, the front face 31 of which is concave.

Au curseur est solidarisé un élément de contact représenté dans la figure 3 A et désigné par la référence générale 32.A contact element shown in FIG. 3 A and designated by the general reference 32 is secured to the cursor.

Cet élément de contact fait avec un matériau bon conducteur de l'électricité a la forme générale d'un U. L'une, 33, des branches de l'élément de contact 32 constitue une lame de contact dont la flexibilité est augmentée par deux saignées 34 et 35 ménagées au niveau du coude formé avec le fond ou branche transversale 36 de l'élément de contact 32.This contact element made of a material which is good conductor of electricity has the general shape of a U. One, 33, of the branches of the contact element 32 constitutes a contact blade whose flexibility is increased by two grooves 34 and 35 formed at the elbow formed with the bottom or transverse branch 36 of the contact element 32.

A l'aide de deux autres saignées 37 et 38 ménagées dans le fond de l'élément de contact 32, on a dégagé du fond 36, de part et d'autre d'un perçage 39 qui y est prévu, deux languettes latérales 40 et 41, alors qu'en face de la lame de contact 33, le fond 36 porte l'autre branche verticale de l'élément de contact 32 en forme de U.With the aid of two other grooves 37 and 38 formed in the bottom of the contact element 32, two lateral tabs 40 have been released from the bottom 36, on either side of a hole 39 which is provided therein. and 41, while opposite the contact blade 33, the bottom 36 carries the other vertical branch of the U-shaped contact element 32.

L'élément de contact 32 est adapté à être fixé au curseur 25, de la façon représentée à la figure 3, lequel curseur 25 comporte dans la face inférieure de son fond 26 un téton non visible, qui passe par le perçage 39 de la branche transversale 36 de l'élément de contact et est engagé dans une rainure centrale 42 ménagée dans la face supérieure de l'embase 14, deux autres rainures latérales 43 et 44 disposées de part et d'autre de la rainure 42, servant de guidage aux languettes latérales 40 et 41.The contact element 32 is adapted to be fixed to the cursor 25, as shown in FIG. 3, which cursor 25 has in the lower face of its bottom 26 a non-visible stud, which passes through the bore 39 of the branch transverse 36 of the contact element and is engaged in a central groove 42 formed in the upper face of the base 14, two other lateral grooves 43 and 44 arranged on either side of the groove 42, serving to guide the side tabs 40 and 41.

Le curseur 25 peut soit être disposé entre la lame de contact 33 de l'élément de contact 32 et sa seconde branche 39, ou encore celle-ci peut venir se loger dans une fente, non représentée ménagée dans le curseur 25, de préférence au cours de sa fabrication.The cursor 25 can either be disposed between the contact blade 33 of the contact element 32 and its second branch 39, or the latter can come to be housed in a slot, not shown, formed in the cursor 25, preferably at the during its manufacture.

Enfin, les rainures 43 et 44 comportent respectivement des crans d'arrêt 44 et 47 situés à une certaine distance des chevilles 21 et 22, comme cela sera explicité à propos du mode de fonctionnement décrit plus bas, après avoir noté qu'un ressort 48, de préférence hélicoïdal, est prévu entre la face arrière du curseur 25 et l'élément de paroi 23.Finally, the grooves 43 and 44 respectively comprise stop notches 44 and 47 located at a certain distance from the pins 21 and 22, as will be explained with regard to the operating mode described below, after having noted that a spring 48 , preferably helical, is provided between the rear face of the slider 25 and the wall element 23.

Sur les parois verticales 23 et 24 vient se fixer la plaque de fermeture 49', faite de préférence avec une céramique, et pourvue d'une ouverture 50 qui se situe au droit du bossage prismatique 30 lorsque celui-ci est dans sa position représentée dans la figure 3, cette plaque fermant le dispositif de coupure de l'invention pour empêcher le passage éventuel d'un arc qui pourrait se produire à la coupure, alors que l'ensemble ainsi fermé est coiffé d'un couvercle 51 (figure 4) en matière plastique moulée et comportant une ouverture 52 située au droit de l'ouverture 50 de la plaque de fermeture 49'.On the vertical walls 23 and 24 is fixed the closing plate 49 ', preferably made with a ceramic, and provided with an opening 50 which is located in line with the prismatic boss 30 when the latter is in its position shown in FIG. 3, this plate closing the cut-off device of the invention to prevent the possible passage of an arc which could occur during cut-off, while the assembly thus closed is capped with a cover 51 (FIG. 4) made of molded plastic and comprising an opening 52 situated in line with the opening 50 of the closing plate 49 '.

Dans la position représentée dans la figure 3, un fil fusible 49 du type mono- ou multifilaire est soudé aux chevilles 19 et 20 en passant sur la face concave 31 du bloc prismatique 30, retenant ainsi le curseur 25 dans une première position dans laquelle le ressort 48 est comprimé.In the position shown in FIG. 3, a fusible wire 49 of the single or multi-wire type is welded to the pins 19 and 20 passing over the concave face 31 of the prismatic block 30, thus retaining the cursor 25 in a first position in which the spring 48 is compressed.

Si l'on suppose que les broches 15, 16 sont engagées dans des douilles ou soudées aux pistes conductrices d'un circuit à surveiller d'une carte imprimée et que les broches 17 et 18 sont engagées dans des douilles ou soudées aux pistes conductrices d'un circuit de signalisation de cette même carte, en cas de fusion du fil 49, le curseur 25 est propulsé par le ressort 48 vers les chevilles 21 et 22 en étant guidé dans les rainures 42, 43 et 44 par le téton non représenté et par les languettes 40 et 41 qui dépassent les crans d'arrêt 46 et 47 après que la lame de contact 33 vienne porter contre les chevilles 21, 22, les réunissant électriquement et complétant ainsi le circuit de la piste conductrice d'un circuit de signalisation optique ou sonore ou de commande d'un relais autorisant une coupure ou toute autre fonction de commande ou de contrôle.If it is assumed that the pins 15, 16 are engaged in sockets or welded to the conductive tracks of a circuit to be monitored on a printed circuit board and that the pins 17 and 18 are engaged in sockets or welded to the conductive tracks d '' a signaling circuit of this same card, in the event of fusion of the wire 49, the cursor 25 is propelled by the spring 48 towards the pins 21 and 22 while being guided in the grooves 42, 43 and 44 by the stud not shown and by the tabs 40 and 41 which protrude from the stop notches 46 and 47 after the contact blade 33 comes to bear against the pins 21, 22, bringing them together electrically and thus completing the circuit of the conductive track with a signaling circuit optical or audible or command of a relay authorizing a cut-off or any other command or control function.

En venant porter contre les chevilles 21 et 22, la lame de contact 33 s'incurve entre ces dernières pour assurer un bon contact qui est maintenu par les crans d'arrêt 46 et 47 qui s'opposent à tout retour de la lame de contact 33 dans une position plane.Coming to bear against the pins 21 and 22, the contact blade 33 curves between the latter to ensure good contact which is maintained by the catch notches 46 and 47 which oppose any return of the contact blade 33 in a flat position.

Alors que dans la position armée telle que représentée dans la figure 3 le bossage prismatique 30 qui peut porter une pastille de couleur verte est visible à travers les ouvertures 50 et 52, la fusion du fil 49 peut être identifiée par l'absence dudit bossage 30 au niveau de ces ouvertures.While in the armed position as shown in FIG. 3, the prismatic boss 30 which can carry a green patch is visible through the openings 50 and 52, the melting of the wire 49 can be identified by the absence of said boss 30 at these openings.

On dispose ainsi d'un moyen permettant à la fois d'identifier une carte comportant un fusible fondu et le dispositif de coupure concerné.There is thus a means which makes it possible both to identify a card comprising a blown fuse and the cut-off device concerned.

Si l'on souhaite n'avoir qu'une indication visuelle, il est possible de supprimer les chevilles 21 et 22 de même que l'élément de contact 32.If it is desired to have only a visual indication, it is possible to remove the pins 21 and 22 as well as the contact element 32.

A la figure 6, la référence 14 désigne l'embase en matière isolante, embase dans laquelle est prévu le curseur 25.In FIG. 6, the reference 14 designates the base made of insulating material, the base in which the cursor 25 is provided.

Celui-ci est une pièce en céramique comportant un fond 26 pourvu d'un élément de parois verticales 27 à face frontale 28 et à face intérieure 29, et, à une certaine distance de celle-ci, le fond 26 porte un bloc prismatique dont la face frontale 31 est concave.This is a ceramic part comprising a bottom 26 provided with an element of vertical walls 27 with a front face 28 and an internal face 29, and, at a certain distance from this, the bottom 26 carries a prismatic block whose the front face 31 is concave.

Le fil fusible 49 passe sur cette face frontale concave 31 et il est accroché à la première paire de chevilles 19 et 20, en armant le ressort 48 logé dans une cavité 101 du curseur 25 et prenant appui contre une butée fixe 102 portée par l'embase 14 (voir fig. 6).The fusible wire 49 passes on this concave front face 31 and it is hooked to the first pair of pins 19 and 20, by arming the spring 48 housed in a cavity 101 of the slider 25 and bearing against a fixed stop 102 carried by the base 14 (see fig. 6).

A la face frontale 28 du curseur 25 est fixée par des moyens apropriés tels que des vis ou des rivets non représentés, une lame flexible 103 à la partie médiane de laquelle est fixée par des vis ou des rivets 104 et 105, une plaquette d'acier 106, alors qu'en face de celle-ci, l'embase 14 porte un aimant permanent 107 situé entre la seconde paire de chevilles 21 et 22.To the front face 28 of the slider 25 is fixed by suitable means such as screws or rivets not shown, a flexible blade 103 to the middle part of which is fixed by screws or rivets 104 and 105, a plate of steel 106, while opposite it, the base 14 carries a permanent magnet 107 located between the second pair of pins 21 and 22.

Dès lors, on voit que lors de la fusion du fil fusible 49, le curseur 25 est propulsé par le ressort 48 en direction des chevilles 21 et 22 que la lame flexible 103 relie électriquement entre elles, en s'incurvant, alors que la plaquette d'acier 106 se colle sur l'aimant permanent 107 ce qui assure le blocage de la lame flexible 103 contre les chevilles 21 et 22, l'établissement d'un bon contact tout en évitant des rebondissements au niveau des chevilles 21 et 22 de la lame flexible qui a de préférence la forme d'une cuvette à ailes latérales redressées 108 et 109.Consequently, it can be seen that during the melting of the fusible wire 49, the cursor 25 is propelled by the spring 48 in the direction of the pins 21 and 22 that the flexible blade 103 electrically connects together, by bending, while the plate of steel 106 sticks to the permanent magnet 107 which ensures the blocking of the flexible blade 103 against the pins 21 and 22, the establishment of a good contact while avoiding rebounds at the level of the pins 21 and 22 the flexible blade which preferably has the shape of a bowl with straightened lateral wings 108 and 109.

Alors que dans le dispositif décrit ci-dessus le contact entre la lame flexible et la seconde paire de chevilles s'opère sous l'action d'un ressort de propulsion du curseur, et est maintenu par un blocage magnétique, ces opérations sont effectuées dans la réalisation des figures 7 et 8 uniquement par des moyens élastiques, plus spécialement par un second ressort qui est prévu en plus du ressort de propulsion du curseur.While in the device described above, the contact between the flexible blade and the second pair of dowels takes place under the action of a propelling spring of the slider, and is maintained by a magnetic lock, these operations are carried out in the embodiment of Figures 7 and 8 only by elastic means, more especially by a second spring which is provided in addition to the propulsion spring of the cursor.

Dans ces figures, on retrouve à nouveau l'embase 14 et la première paire de chevilles 19, 20 entre lesquelles est tendu le fil fusible 49 qui prend appui sur la face frontale 31 du curseur 25. Celui-ci est monté dans une chambre 110 d'une cage 111 portée par l'embase 14, et dans l'état représenté à la figure 7 ce curseur arme un ressort 112 monté sur une tige axiale 113 portée par le curseur 25 ou un piston 114 appliqué contre le fond d'un trou borgne 115 ménagé dans le curseur, ledit ressort 112 prenant par ailleurs appui contre une paroi transversale 116 de la cage 111. Cette paroi transversale 116 comporte un perçage 117 qui est traversé par la tige axiale 113 qui pénètre dans une seconde chambre 118 de la cage 111. Cette seconde chambre 118 possède un fond à deux chanfreins 119 et 120 qui débouchent dans une cavité sous-jacente 121.In these figures, we again find the base 14 and the first pair of dowels 19, 20 between which is stretched the fusible wire 49 which is supported on the front face 31 of the cursor 25. The latter is mounted in a chamber 110 a cage 111 carried by the base 14, and in the state shown in FIG. 7, this cursor arms a spring 112 mounted on an axial rod 113 carried by the cursor 25 or a piston 114 applied against the bottom of a blind hole 115 formed in the slider, said spring 112 also bearing against a transverse wall 116 of the cage 111. This transverse wall 116 has a bore 117 which is crossed by the axial rod 113 which enters a second chamber 118 of the cage 111. This second chamber 118 has a bottom with two chamfers 119 and 120 which open into an underlying cavity 121.

Sur ces chanfreins sont disposées deux billes 122 et 123 situées de part et d'autre de la tige axiale 113 associée au curseur, la monture du chanfrein, les diamètres des billes et la section transversale de la tige axiale étant choisis de telle sorte que les billes 122 et 123 ne peuvent tomber dans la cavité sous-jacente 121 que lorsque la tige axiale 113 se dégage au moins partiellement de la seconde chambre.On these chamfers are arranged two balls 122 and 123 located on either side of the axial rod 113 associated with the slider, the mounting of the chamfer, the diameters of the balls and the cross section of the axial rod being chosen so that the balls 122 and 123 can only fall into the underlying cavity 121 when the axial rod 113 at least partially emerges from the second chamber.

Enfin, la cage 111 comporte dans ses parois latérales deux fentes 124 et 125 qui servent de guides à la lame flexible 126 faite avec un matériau électriquement conducteur et s'étendant au-dessus des chevilles 21 et 22 dans la portion représentée dans la figure 3, en étant appliquée contre les billes 122 et 123 par un ressort de compression 127 qui prend, par ailleurs, appui contre le fond du couvercle 128 du dispositif.Finally, the cage 111 has in its side walls two slots 124 and 125 which serve as guides for the flexible blade 126 made with an electrically conductive material and extending above the pins 21 and 22 in the portion shown in FIG. 3 , by being applied against the balls 122 and 123 by a compression spring 127 which, moreover, bears against the bottom of the cover 128 of the device.

Lorsque le fil fusible 49 fond, le curseur 25 est propulsé vers une butée 129 portée par l'embase 14, sous l'action du ressort 112 qui se détend et qui entraîne le piston 114 et sa tige axiale 113. Dès que celle-ci quitte la seconde chambre 118 en se dégageant des billes 122 et 123, celles-ci tombent dans la cavité sous-jacente 121, et le second ressort 127 se détend en abaissant la lame flexible 126 qui vient porter sur les chevilles 21 et 22, en se bombant entre celles-ci sous l'effet de la force exercée par ledit second ressort 127.When the fusible wire 49 melts, the cursor 25 is propelled towards a stop 129 carried by the base 14, under the action of the spring 112 which relaxes and which drives the piston 114 and its axial rod 113. As soon as the latter leaves the second chamber 118 by disengaging from the balls 122 and 123, these fall into the underlying cavity 121, and the second spring 127 expands by lowering the flexible blade 126 which comes to bear on the pins 21 and 22, bulging between them under the effect of the force exerted by said second spring 127.

Comme indiqué plus haut, ces deux chevilles 21 et 22 font partie d'un circuit de signalisation de la fusion de fil fusible, en sorte que l'utilisateur peut identifier rapidement le dispositif coupe- circuit défectueux et le remplacer par un nouveau.As indicated above, these two pins 21 and 22 are part of a circuit for signaling the melting of fusible wire, so that the user can quickly identify the faulty circuit breaker device and replace it with a new one.

Claims (9)

1. Protection device with a mono or multi-wire fuse, intended particularly for plugging into printed circuit boards and comprising:
a) a base (14) of an insulating material,
b) a first pair of pins (15, 16), which are designed to be plugged into corresponding sockets provided on a level with a circuit to be protected, or to be soldered to the latter, followed by a first pair of pegs (19, 20) projecting on the other surface of the base and designed for fixing the fuse wire (49), for example by means of soldering,
c) a second pair of pegs (21, 22) connected to a signalling circuit,
d) a slide (25) which can be held in a first position next to the first pair of pegs by means of the fuse wire (49), and which is provided with a spring (48) which exerts a propulsion force on the slide in the direction of the second pair of pegs (21, 22),
e) guiding means provided in the base for guiding the displacement of the slide,
f) a contact foil (33) associated with the slide and capable of contacting the second pair of pegs after fusion of the fuse wire,
characterised in that it comprises means, associated with the slide and the base, for ensuring a good contact without rebound between the contact foil and the second pair of pegs, the said means comprising a contact device (32) carried by the slide and having approximately the form of a U, of which one branch extends transversely to the trajectory of the slide (25), is flexible and forms the contact foil (33), whose base (36) or transverse branch is provided with an opening (39) which serves for the passage of one end of the slide (25) and is provided with two lateral flexible strips (40,41), the end of the slide being guided in a groove (42) made in the base (14), and the two lateral thin sheets (40,41), arranged on both sides of the said opening, are guided in two further lateral grooves (43,44) of the base (14).
2. Protection device according to claim 1, characterised in that stop catches (46, 47) are provided in the lateral grooves (43, 44) of the base, which, when the contact foil (33) is carried against the second pair of pegs, lock the two small lateral strips of the contact device (32) in an inwardly curving position between the second pair of pegs.
3. Protection device with a mono or multi-wire fuse, intended particularly for plugging into printed circuit boards and comprising:
a) a base (14) of an insulating material,
b) a first pair of pins (15, 16), which are designed to be plugged into corresponding sockets provided on a level with a circuit to be protected, or to be soldered to the latter, followed by a first pair of pegs (19, 20) projecting on the other surface of the base and designed for fixing the fuse wire (49), for example by means of soldering,
c) a second pair of pegs (21, 22) connected to a signalling circuit,
d) a slide (25) which can be held in a first position next to the first pair of pegs by means of the fuse wire (49), and which is provided with a spring (48) which exerts a propulsion force on the slide in the direction of the second pair of pegs,
e) guiding means provided in the base for guiding the displacement of the slide,
f) a contact foil (103) associated with the slide and capable of contacting the second pair of pegs after fusion of the fuse wire,
characterised in that it comprises means, associated with the slide and the base, for ensuring a good contact without rebound between the contact foil and the second pair of pegs, the said means comprising a small frontal steel plate (106) carried by the flexible contact foil (103) and arranged opposite a permanent magnet (107) supported by the base between the second pair of pegs (21, 22) and to which the small steel plate adheres, when fusion of the wire occurs, by inwardly curving itself between these pegs under the action of the released spring.
4. Protection device with a mono or multi-wire fuse, intended particularly for plugging into printed circuit boards and comprising:
a) a base (14) of an insulating material,
b) a first pair of pins (15, 16), which are designed to be plugged into corresponding sockets provided on a level with a circuit to be protected, or to be soldered to the latter, followed by a first pair of pegs (19, 20) projecting on the other surface of the base and designed for fixing the fuse wire (49), for example by means of soldering,
c) a second pair of pegs (21, 22) connected to a signalling circuit,
d) a slide (25) which can be held in a first position next to the first pair of pegs by means of the fuse wire, and which is provided with a spring (48) which exerts a propulsion force on the slide,
e) guiding means provided in the base for guiding the displacement of the slide,
f) a contact foil (126) associated with the slide and capable of contacting the second pair of pegs after fusion of the fuse wire,
characterised in that it comprises means, associated with the slide and the base, for ensuring a good contact without rebound between the contact foil and the second pair of pegs, the said means being formed by a second spring (127) which is distinct from the one provided for the propulsion of the slide, when fusion of the fuse wire occurs, and which acts corresponding to a direction perpendicular to the direction of action of the said slide propulsion spring, the said contact foil (126) being displaced towards the said second pair of pegs under the action of the said second spring (127) when a locking mechanism is suppressed, interfering with the fusion of the fuse wire.
5. Protection device according to claim 4, characterised in that the locking mechanism comprises a casing (118) with guiding slots (124, 125) of the contact foil (126), which is maintained in its position, turned away from the said second pair of pegs, with the aid of the second spring (127) and by means of two ball bearings (122, 123) held by a chamfering (119, 120) of the casing by means of a subjacent piston, which is associated with the slide and adapted to be disengaged from the ball bearings when fusion of the fuse wire occurs and the spring for the propulsion of the slide is released.
6. Protection device according to any one of claims 1 to 5,
characterised in that the slide (25), preferably formed of a ceramic material, comprises a projecting part with a prismatic shape and a convex frontal surface, across which the fuse wire (49) passes, a spring (48) being provided between the opposite surface to that above and a corresponding partition of the base (1).
7. Protection device according to claim 6,
characterised in that the base (14) comprises a partition identical to that against which the spring (48) is carried, the whole of these two partitions serving to position a covering plate (49') which serves to close the protection device, the whole being covered by a cover (51) friction- fitted on to the base (14).
8. Protection device according to claim 7,
characterised in that the closing plate (49') and the cover (51) comprise respectively an opening (50, 52) situated to the right of the projecting part of the slide (25), allowing the latter to be observed when the slide (25) is in position armed with the fuse wire (49).
9. Protection device according to any one of claims 1 to 8,
characterised in that the second pair of pegs (21, 22) is followed, on the side of the printed circuit board, by a second pair of pins (17, 18) designed to be plugged into corresponding sockets carried by the said board and connected to the signalling circuit.
EP84402000A 1983-10-20 1984-10-05 Fuse devices particularly suitable for being mounted on printed-circuit cards Expired EP0139581B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8316683 1983-10-20
FR8316683A FR2553933B1 (en) 1983-10-20 1983-10-20 FUSE DEVICES IN PARTICULAR FOR MOUNTING ON PRINTED CIRCUIT BOARDS
FR8414836 1984-09-27
FR8414836A FR2570874A2 (en) 1984-09-27 1984-09-27 Fuse devices intended in particular to be mounted on printed circuit boards

Publications (3)

Publication Number Publication Date
EP0139581A2 EP0139581A2 (en) 1985-05-02
EP0139581A3 EP0139581A3 (en) 1985-10-02
EP0139581B1 true EP0139581B1 (en) 1988-07-20

Family

ID=26223636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84402000A Expired EP0139581B1 (en) 1983-10-20 1984-10-05 Fuse devices particularly suitable for being mounted on printed-circuit cards

Country Status (5)

Country Link
US (1) US4599597A (en)
EP (1) EP0139581B1 (en)
JP (1) JPS60115121A (en)
DE (1) DE3472855D1 (en)
DK (1) DK487184A (en)

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Also Published As

Publication number Publication date
EP0139581A2 (en) 1985-05-02
EP0139581A3 (en) 1985-10-02
DE3472855D1 (en) 1988-08-25
DK487184D0 (en) 1984-10-11
US4599597A (en) 1986-07-08
DK487184A (en) 1985-04-21
JPS60115121A (en) 1985-06-21

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