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EP2806450A1 - Fuse cartridge with bi-material knife - Google Patents

Fuse cartridge with bi-material knife Download PDF

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Publication number
EP2806450A1
EP2806450A1 EP13305680.4A EP13305680A EP2806450A1 EP 2806450 A1 EP2806450 A1 EP 2806450A1 EP 13305680 A EP13305680 A EP 13305680A EP 2806450 A1 EP2806450 A1 EP 2806450A1
Authority
EP
European Patent Office
Prior art keywords
coating
knife
core
fuse
cartridge
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.)
Withdrawn
Application number
EP13305680.4A
Other languages
German (de)
French (fr)
Inventor
Etienne Gancel
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.)
EFEN GmbH
Original Assignee
EFEN GmbH
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
Application filed by EFEN GmbH filed Critical EFEN GmbH
Priority to EP13305680.4A priority Critical patent/EP2806450A1/en
Publication of EP2806450A1 publication Critical patent/EP2806450A1/en
Withdrawn legal-status Critical Current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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/143—Electrical contacts; Fastening fusible members to such contacts
    • H01H85/153—Knife-blade-end contacts
    • 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/0411—Miniature fuses
    • H01H85/0415—Miniature fuses cartridge type
    • H01H85/0417—Miniature fuses cartridge type with parallel side contacts

Definitions

  • the present invention relates to the field of electrical safety equipment, and relates to a particular fuse cartridge and its manufacturing process.
  • FR 2,630,584 a conventional fuse cartridge, having an insulating body comprising the fuse element itself, welded at each of its two ends to a knife for contact and mounting in a connection box. Each knife emerges from a lid mounted on the insulating body.
  • US 1,566,852 and US 1 95089 each have an architecture of a similar type, the fuse element being fixed by screwing to the two knives, each being in the form of a thick lamella.
  • FR 2,679,378 discloses in particular lids through which each time a knife in the form of a blade, thereby delimiting an inner portion, where is fixed the fuse element, and an outer portion, which will come into the housing and thus form the connection terminal fuse cartridge.
  • US 389,979 discloses in turn a mounting where the cover can be locked on the knife by rotation about the axis of symmetry of the cartridge.
  • US 3,134,001 finally discloses a manufacturing process in particular for the knives of such a cartridge, by galvanizing silver on a cuprous support.
  • One of the disadvantages of this method is that a large amount of silver is used.
  • the cartridge must have, especially at the terminals, sufficient mechanical strength for its assembly and its mounting in the base, without requiring an excessive amount of raw material.
  • the present invention aims to overcome at least a part and preferably all these disadvantages, and proposes to make the knife, at the outer terminal, in the form of a metal core coated, which limits the amount of copper required and the amount of silver deposited.
  • the subject of the invention is a fusible cartridge, comprising a body in which there is a fuse element for the safety of a current flow, as well as, at each of the two ends of said fuse cartridge, a on the one hand, a lid closing an open end of the body, and, on the other hand, a knife traversing said lid and having an inner portion extending into the body for fixing the fuse element and an outer portion forming a terminal of the fuse cartridge for its electrical contact and its maintenance in a corresponding base.
  • This cartridge is characterized in that the knife is in the form of a conductive core and a coating which covers it at the level of the outer portion but with the exception of at least one zone forming a contact patch at the the level of which the outer portion of the metal knife can come into electrical contact with the base in which the fuse cartridge is to be mounted.
  • the subject of the invention is also a method for manufacturing such a fuse cartridge, comprising successive steps consisting in to cut a ring of metallic material, plastically deform by deforming the cut-off rod to form the soul of a knife, overmould a coating on the soul of the knife, at the level of the outer portion and with the exception of at least one contact pad, then coating the knife, essentially at the level of its part not covered by the coating, with a coating intended to promote electrical conduction, the material coating being significantly less sensitive to the coating than is the core.
  • the knives are thus obtained by juxtaposition of two materials, one of which provides essentially the function of electrical conduction while the other ensures the geometry and a mechanical function.
  • the invention therefore firstly relates to a fuse cartridge 1, comprising a body 2 in which there is a fuse element 3 for the safety of a current flow, and, at each of the two ends of said fuse cartridge 1, on the one hand, a cover closing an open end of the body 2, and, on the other hand, a knife 5 passing through said cover and having an inner portion 6 extending in the body 2 for fixing the element fuse 3 and an outer portion 7 forming a terminal of the fuse cartridge 1 for its electrical contact and its holding in a corresponding base.
  • the fuse cartridge 1 has the shape of an elongated element, and has, at each of its two ends, a terminal intended for mounting in a base.
  • the lengths correspond to the dimensions measured along the axis in which the knife 5 extends, that is to say in the axis which extends from one to the other of the two. terminals of the fuse cartridge 1.
  • the thicknesses correspond to the dimensions measured in the axis which extends from one to the other of the two contact zones of a knife with the base. The height is perpendicular to the length and the thickness.
  • the electrical contact with the base is made at this terminal.
  • the terminal is formed by the outer portion 7 of the knife 5, the latter still having, at its other end, an inner portion 6, which is located within the body 2 and which serves to fix the fuse element 3, by welding, brazing, screwing or any other means.
  • the fuse cartridge 1 is therefore intended to be mounted in a branch base, comprising two branching areas, each for receiving a terminal of said cartridge 1.
  • the terminal formed by the outer portion 7 of the knife 5
  • the tabs firmly hold the terminal once it is inserted.
  • the thickness of the terminal, between these two contact zones must therefore be of precise dimensions and corresponding to a certain size, in order to guarantee the compatibility of the cartridge with the base to obtain a good tightening of the terminal between the legs of the terminal. base, which creates both a good electrical contact and a good mechanical support.
  • the knife 5 is in the form of a conductive core 13 and a coating 8 which covers it at the level of the outer portion 7 but with the exception of at least one zone forming a contact pad 9 at which the outer portion 7 of the metal knife 5 can come into electrical contact with the base in which the fuse cartridge 1 is to be mounted.
  • the coating 8 may be synthetic insulating, obtained by overmolding on a metal core 13 placed as an insert in a tool.
  • the knife 5 is therefore a bi-material component combining, on the one hand, a conductive metal core 13 and a coating 8.
  • the core 13, at its surfaces not covered by the coating 8, is coated silver or any other surface coating intended to improve the conductivity and resistance to oxidation.
  • Such a coating is conventionally made by galvanizing 104.
  • the coating 8 is intended to limit the surface of the core 13 which will be effectively covered with such a coating.
  • the coating 8 is made of resin or any other material less sensitive than the core 13, or inert, to this galvanization 104.
  • the coating 8 is made of a material that has good mechanical and thermal resistance characteristics, and is less expensive than the material of the core 13 and the silver used for galvanizing. This material, possibly an insulating plastic resin, is advantageously reticent to receive the same superficial deposit as that applied to the core 13, by the same method.
  • the external shape of the terminal is thus defined by the coating 8 or by the core 13, in particular places where the latter is not masked by said coating 8.
  • the core 13 is thus coated with silver by galvanization 104, over its entire surface not covered by the coating 8, namely, on the one hand, at least one contact pad 9 with the base and preferably two, and, on the other hand, a contact zone 12 for fixing the fuse element 3 at the inner portion 6.
  • This contact zone 12 is preferably of lower thickness than the template and of higher height than the template .
  • the coating 8 is advantageously flush with the contact pads 9, so that the coating 8 combined with the core 5 completely matches the shape of the template normally matched in the prior art by the metal part of the knife 5.
  • the two contact pads 9 on either side of the knife 5 are placed in the outline of the template, the remainder of the template conforming to the coating 8. It is thus possible to envisage, in its outer portion 7, a section of FIG. metal core 13 weaker than that of a monomatiere knife, while remaining compatible with the standard template.
  • the figure 1 this template, which takes the form of a profile whose base is an elongated section ending in a rounded corner, makes it easy to insert the terminal between the legs of the base.
  • the present description essentially refers to an overmoulded coating, although, in absolute terms, other types of methods can also be used to carry out the coating 8 around the core 13.
  • the coating 8 forms a solid portion of the knife 5 at the outer portion 7, the consistency of said coating 8 being greater than that of a simple skin or protective layer.
  • the section of the core 13 preferably represents less than two-thirds of the total section of the outer portion 7. Thus, at least one-third of this section is formed by the coating 8, which is less expensive, which makes it possible to obtain interesting material savings for the knife 5, while maintaining the mechanical strength and an acceptable heating generated by the flow of current in an outer portion 7 of smaller section than the jig.
  • the contact terminal of the fuse cartridge 1 thus takes the form of a metal core 13 around which is a coating 8 of preferentially insulating material, the latter conforming to the shape of the template to be presented by said terminal, so that the core 13 can thus be of much smaller section than the template and lead to it only at the level of two contact pads 9 where the coating 8 is absent, and thanks to which the fuse cartridge 1 comes into contact with the legs of the base .
  • the coating 8 thus occupies a substantial part of the terminal and the template of which it takes the form, said coating 8 preferably being made of insulating synthetic material injected by molding around the core 13, in particular araldite.
  • the core 13 of the metal knife 5 is made in particular of copper, which, after overmolding of the coating 8, is covered with silver.
  • the contact pad 9 is effectively covered with silver, the rest being covered with the coating 8 on which the silver does not deposit.
  • the coating 8 also defines at least part of the lid.
  • the coating 8 can form alone the entire cover which will then be fixed in the body 2, preferably by screwing.
  • the coating 8 defines only a portion of the cover, namely a flange 4.
  • This flange 4 is held between the body 2 and a holding plate which is screwed into said body 2.
  • This flange 4 thus takes the form of a portion overmolded on the core 13 of the metal knife 5 and which constitutes a seat of the knife 5 ensuring its perpendicularity with respect to the remainder of the cover when it is immobilized between the body 2 and that- this.
  • the core 13 has, in its outer portion 7, two similar first zones 10 and between which there is a second zone 11, the thickness of the second zone 11 being higher and the height lower than for the first zones 10.
  • the two contact pads 9 are in particular each provided on one side of the second zone 11, the latter therefore having a thickness corresponding to the template.
  • the height of the first zones 10, although greater than that of the second zone 11, is not necessarily equal to that of the template, so as to reduce the galvanized surface.
  • the core 13 of the terminal of the fuse cartridge 1 has, at the level of the two contact pads 9, a thickness corresponding directly to the template and therefore to the external shape of the terminal, the height of the section of the soul 13 at this point being much weaker than the template, as shown in figure 2 .
  • the outer portion 7 On either side of this second zone 11, the outer portion 7 has a first zone 10, the latter having a section of smaller thickness than that of the second zone 11, but of higher height.
  • the first zone 10 is therefore high in the direction in which the second zone 11 is small, and thin in the direction in which the second zone 11 is thick.
  • the sections of the first zone 10 and the terminal jig itself are therefore elongate in the same direction, namely that of the height.
  • the shape of the first zone 10 thus contributes to stiffening the corresponding terminal of the fuse cartridge 1.
  • the terminal of the fuse cartridge 1 therefore comes into contact with the base at the second zone 11, bearing, on parallel faces, the two contact pads 9.
  • the core 13 has, at the inner portion 6 of the knife 5, an end of contact 12 for fixing the fuse element 3 whose height is higher and the thickness is lower than for the outer portion 7, in particular for attachment by welding, screwing, or other.
  • the contact end 12 is preferably not covered by the coating 8, so that a coating with improved conductive characteristics can be deposited there as on the uncoated rest of the core 13, which leads to better circulation electricity with the fuse element 3 attached to it.
  • the contact end 12 therefore extends in the direction of the height, like the first two zones 10, and may advantageously have, in this direction, an even greater dimension than the first zones 10, or even the template itself. even.
  • the attachment of the fuse element 3 is much easier, and the flow of current is more advantageous since it can be spread over a wider width.
  • This can be, in some cases, a source of additional savings, when several fusible elements 3 must be arranged in parallel between the contact ends 12 of each terminal located vis-à-vis. In fact, a smaller number of elements of greater height in parallel offer the same overall resistance than a higher number of lower elements.
  • the welding of the fuse element 3 is all the easier as the core 13 at this location is of low thickness.
  • the coating 8 may be entirely covered with silver.
  • the coating 8 thus covers the core 13 with the exception of two contact pads 9 which face each other as well as a contact end 12 situated at the level of the inner portion 6.
  • the lid extends at a first zone 10, so as to ensure a good continuity of material for the coating 8, in particular around this first zone 10.
  • the lid can be located at a first zone 10 thinner, the inner portion 6 being formed of a thicker zone and then the contact end 12, again thinner and higher.
  • the core 13 of the knife 5 then has a shape whose section successively presents different geometries, as shown in FIG. figure 5 : a first zone 10, of high height and low thickness, then a second zone 11 sufficiently thick to carry the contact pads 9 which arrive at the template whose terminal takes the form, of lower height than the first zone 10, then another first zone 10, then a possible section equivalent to that of the second zone 11, then, at the inner portion 6, a contact end 12, of even smaller thickness and height even higher than for the first zone 10.
  • the first zones 10 have opening holes which promote the good adhesion of the coating 8 on the core 13.
  • the flat and thin parts of the core 13 give the knife 5 the necessary mechanical strength and good cohesion with the coating 8.
  • the invention also relates to a method of manufacturing 100 a fuse cartridge 1 as described above, and comprising successive steps of to cut 101 a ring of metallic material, plastically deforming by punching 102 the deformed rod to form the core 13 of a knife 5, overmould 103 a coating 8 on the core 13 of the knife 5, at the outer portion 7 and with the exception of at least one contact pad 9, then coating the knife 5, essentially at its part not covered by the coating 8, with a coating intended to promote electrical conduction, the coating 8 of material being significantly less sensitive to the coating than is the core 13.
  • the stamping step allows in particular to create on the rod a contact end 12 for fixing the fuse element 3 at an inner portion 6, and / or two similar first zones 10 and between which there is a second zone 11, the thickness of the second zone 11 being higher and the height lower than for the first zones 10, the latter being then covered by the coating 8.
  • the stamping 102 also makes it possible to produce the contact zone of thinner thickness and higher height than the first 10 zones, or even the template itself.
  • the coating 8 will not be covered with a particularly interesting material electrically.
  • the surface of the coating 8 and the at least one contact pad 9 can optionally be shifted, the contact pad 9 being optionally slightly offset from the coating 8 to the outside, in particular to avoid tearing of the material of the coating 8 and bring it between the contact pad 9 and the legs of the base.
  • the terminal of the fuse cartridge 1 no longer exclusively requires metal, but the mounting on one another of the coating 8 and the conductive portion, namely the core 13 of the knife 5, is realized directly during manufacturing by overmolding, which further reduces manufacturing costs.
  • the stamping 102 makes it possible to form, at the level of the inner portion 6, an area of smaller thickness and height that is higher than the outer portion 7 so as to at least facilitate fixation. a fuse element 3 on the contact end 12 thus obtained.
  • the galvanization 104 is therefore essentially on the surfaces of the metal core 13 of the knife 5 remaining apparent, namely in particular the contact pad or pads 9 and the contact end 12.
  • the galvanization 104 and the material used for the However, the coating 8 is not adapted to each other, with the result that the coating 8 is only slightly or not at all covered with silver or other material used for the covering.
  • the galvanizing step 104 can therefore be adjusted for an optimal coating of the surfaces of the core 13 still visible and therefore incompatible with the adjustment necessary to obtain a real coating on the coating 8.
  • the material retained for the coating 8 is therefore chosen so that a galvanizing step 104 adapted to the material of the core 13 does not create on the coating 8 any coating or degradation.
  • the coating 8 is essentially inert for the galvanization 104.
  • the dispensed rod is preferably essentially made of copper, and has a constant section. As has already been said, given the use of galvanization 104, the coating 8 is finally not covered with silver, but only the contact pads 9 that it leaves visible and / or the contact end 12.
  • the profile of the extruded rod can take up the section of the second zone 11, itself corresponding to the template, the stamping 102 being carried out on both sides to flatten said ring and thus form at least first zones 10.
  • the coating 8 comes against the flat and thin side formed by each first zone 10, while it completes perpendicularly the second zone 11.
  • the sections of the knife 5 which are flatter than the second zone 11 are thus obtained by crushing a ring of constant section, advantageously not deformed at the second zone 11 carrying the contact pads 9, or even between the similar section separating one of the first zones 10 from the contact end 12.
  • the thickness of the contact end 12 may be smaller than that of the first zones 10, inasmuch as its height is even higher than that of the first two zones 10 itself higher than that of the second zone 11.
  • covering the outer surface of the knife 5 is made by silver galvanization 104 adapted to the core 13 and not to the coating 8 so that the core 13, and in particular the contact pads 9, is covered with silver, the coating 8 not being or almost not covered with silver

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  • Fuses (AREA)

Abstract

La présente invention a pour objet une cartouche fusible (1), comprenant un corps (2) dans lequel se trouve un élément fusible (3), ainsi que, à chacune des deux extrémités de ladite cartouche fusible (1), d'une part, un couvercle fermant une extrémité ouverte du corps (2), et, d'autre part, un couteau (5) traversant ledit couvercle et présentant une portion intérieure (6) s'étendant dans le corps (2) pour la fixation de l'élément fusible (3) ainsi qu'une portion extérieure (7) formant une borne de la cartouche fusible (1). Cette cartouche fusible (1) est caractérisée en ce que le couteau (5) se présente sous la forme d'une âme conductrice et d'un enrobage (8) qui la recouvre au niveau de la portion extérieure (7) mais à l'exception d'au moins une zone formant une pastille de contact au niveau de laquelle la portion extérieure (7) du couteau métallique (5) peut venir au contact électrique du socle dans lequel la cartouche fusible (1) doit être montée. L'invention a aussi pour objet un procédé de fabrication d'une telle cartouche fusible.The present invention relates to a fuse cartridge (1), comprising a body (2) in which there is a fuse element (3), and, at each of the two ends of said fuse cartridge (1), on the one hand , a cover closing an open end of the body (2), and, secondly, a knife (5) passing through said cover and having an inner portion (6) extending in the body (2) for fixing the fuse element (3) and an outer portion (7) forming a terminal of the fuse cartridge (1). This fuse cartridge (1) is characterized in that the knife (5) is in the form of a conductive core and a coating (8) which covers it at the outer portion (7) but at the except for at least one zone forming a contact patch at which the outer portion (7) of the metal knife (5) can come into electrical contact with the base in which the fuse cartridge (1) is to be mounted. The invention also relates to a method of manufacturing such a fuse cartridge.

Description

La présente invention relève du domaine des équipements de sécurité électrique, et a pour objet une cartouche fusible particulière ainsi que son procédé de fabrication.The present invention relates to the field of electrical safety equipment, and relates to a particular fuse cartridge and its manufacturing process.

On connaît par exemple de FR 2 630 584 une cartouche fusible classique, présentant un corps isolant comprenant l'élément fusible proprement dit, soudé à chacune de ses deux extrémités à un couteau pour le contact et le montage dans un boîtier de connexion. Chaque couteau émerge d'un couvercle monté sur le corps isolant.For example, we know FR 2,630,584 a conventional fuse cartridge, having an insulating body comprising the fuse element itself, welded at each of its two ends to a knife for contact and mounting in a connection box. Each knife emerges from a lid mounted on the insulating body.

US 1 566 852 et US 1 95089 présentent chacun une architecture d'un type semblable, l'élément fusible étant fixé par vissage aux deux couteaux, se présentant chacun sous forme d'une épaisse lamelle. US 1,566,852 and US 1 95089 each have an architecture of a similar type, the fuse element being fixed by screwing to the two knives, each being in the form of a thick lamella.

FR 2 679 378 divulgue en particulier des couvercles que traversent à chaque fois un couteau sous forme de lame, délimitant ainsi une portion intérieure, où est fixé l'élément fusible, ainsi qu'une portion extérieure, qui viendra dans le boîtier et formera ainsi la borne de connexion de la cartouche fusible. FR 2,679,378 discloses in particular lids through which each time a knife in the form of a blade, thereby delimiting an inner portion, where is fixed the fuse element, and an outer portion, which will come into the housing and thus form the connection terminal fuse cartridge.

US 389 979 divulgue quant à lui un montage où le couvercle peut être verrouillé sur le couteau par rotation autour de l'axe de symétrie de la cartouche. US 389,979 discloses in turn a mounting where the cover can be locked on the knife by rotation about the axis of symmetry of the cartridge.

US 3 134 001 divulgue enfin un procédé de fabrication en particulier pour les couteaux d'une telle cartouche, par galvanisation d'argent sur un support cuivreux. Un des inconvénients de ce procédé est qu'une grande quantité d'argent est utilisée. US 3,134,001 finally discloses a manufacturing process in particular for the knives of such a cartridge, by galvanizing silver on a cuprous support. One of the disadvantages of this method is that a large amount of silver is used.

En outre, la cartouche doit présenter, en particulier au niveau des bornes, une tenue mécanique suffisante pour son assemblage ainsi que son montage dans le socle, et ce sans pour autant exiger une quantité excessive de matière première.In addition, the cartridge must have, especially at the terminals, sufficient mechanical strength for its assembly and its mounting in the base, without requiring an excessive amount of raw material.

Il est en outre intéressant de chercher à réduire le prix de revient d'un tel produit, en particulier au niveau du procédé de fabrication et de la quantité de matière nécessaire.It is also interesting to try to reduce the cost of such a product, especially in terms of the manufacturing process and the amount of material required.

La présente invention a pour but de pallier au moins une partie et préférentiellement tous ces inconvénients, et propose de réaliser le couteau, au niveau de la borne extérieure, sous forme d'une âme métallique enrobée, ce qui permet de limiter la quantité de cuivre nécessaire ainsi que la quantité d'argent déposée.The present invention aims to overcome at least a part and preferably all these disadvantages, and proposes to make the knife, at the outer terminal, in the form of a metal core coated, which limits the amount of copper required and the amount of silver deposited.

A cet effet, l'invention a pour objet une cartouche fusible, comprenant un corps dans lequel se trouve un élément fusible pour la sécurité d'une circulation de courant, ainsi que, à chacune des deux extrémités de ladite cartouche fusible, d'une part, un couvercle fermant une extrémité ouverte du corps, et, d'autre part, un couteau traversant ledit couvercle et présentant une portion intérieure s'étendant dans le corps pour la fixation de l'élément fusible ainsi qu'une portion extérieure formant une borne de la cartouche fusible pour son contact électrique et son maintien dans un socle correspondant.For this purpose, the subject of the invention is a fusible cartridge, comprising a body in which there is a fuse element for the safety of a current flow, as well as, at each of the two ends of said fuse cartridge, a on the one hand, a lid closing an open end of the body, and, on the other hand, a knife traversing said lid and having an inner portion extending into the body for fixing the fuse element and an outer portion forming a terminal of the fuse cartridge for its electrical contact and its maintenance in a corresponding base.

Cette cartouche est caractérisée en ce que le couteau se présente sous la forme d'une âme conductrice et d'un enrobage qui la recouvre au niveau de la portion extérieure mais à l'exception d'au moins une zone formant une pastille de contact au niveau de laquelle la portion extérieure du couteau métallique peut venir au contact électrique du socle dans lequel la cartouche fusible doit être montée.This cartridge is characterized in that the knife is in the form of a conductive core and a coating which covers it at the level of the outer portion but with the exception of at least one zone forming a contact patch at the the level of which the outer portion of the metal knife can come into electrical contact with the base in which the fuse cartridge is to be mounted.

L'invention a aussi pour objet un procédé de fabrication d'une telle cartouche fusible, comprenant des étapes successives consistant à
débiter un jonc de matière métallique,
déformer plastiquement par matriçage le jonc débité pour former l'âme d'un couteau,
surmouler un enrobage sur l'âme du couteau, au niveau de la portion extérieure et à l'exception d'au moins une pastille de contact, puis
revêtir le couteau, essentiellement au niveau de sa partie non recouverte par l'enrobage, d'un revêtement destiné à favoriser la conduction électrique,
l'enrobage de matière étant significativement moins sensible au revêtement que ne l'est l'âme.The subject of the invention is also a method for manufacturing such a fuse cartridge, comprising successive steps consisting in
to cut a ring of metallic material,
plastically deform by deforming the cut-off rod to form the soul of a knife,
overmould a coating on the soul of the knife, at the level of the outer portion and with the exception of at least one contact pad, then
coating the knife, essentially at the level of its part not covered by the coating, with a coating intended to promote electrical conduction,
the material coating being significantly less sensitive to the coating than is the core.

Les couteaux sont ainsi obtenus par juxtaposition de deux matières, dont l'une assure essentiellement la fonction de conduction électrique tandis que l'autre assure la géométrie et une fonction mécanique.The knives are thus obtained by juxtaposition of two materials, one of which provides essentially the function of electrical conduction while the other ensures the geometry and a mechanical function.

L'invention sera mieux comprise, grâce à la description ci-après, qui se rapporte à des modes de réalisation préférés, donnés à titre d'exemples non limitatifs, et expliqués avec référence aux dessins schématiques annexés, dans lesquels :

  • la figure 1 est une vue en perspective d'un couteau avec son couvercle, conformément à l'invention ;
  • la figure 2 est une vue de dessus d'un couteau enrobé conformément à l'invention ;
  • la figure 3 est une vue de côté d'un couteau enrobé conformément à l'invention ;
  • la figure 4 montre une section d'une cartouche selon l'invention ;
  • la figure 5 montre la forme de l'âme d'un couteau conformément à l'invention, et
  • la figure 6 montre les étapes du procédé de fabrication.
The invention will be better understood, thanks to the following description, which refers to preferred embodiments, given by way of non-limiting examples, and explained with reference to the appended diagrammatic drawings, in which:
  • the figure 1 is a perspective view of a knife with its lid, according to the invention;
  • the figure 2 is a top view of a coated knife according to the invention;
  • the figure 3 is a side view of a coated knife according to the invention;
  • the figure 4 shows a section of a cartridge according to the invention;
  • the figure 5 shows the shape of the soul of a knife according to the invention, and
  • the figure 6 shows the steps of the manufacturing process.

L'invention a donc tout d'abord pour objet une cartouche fusible 1, comprenant un corps 2 dans lequel se trouve un élément fusible 3 pour la sécurité d'une circulation de courant, ainsi que, à chacune des deux extrémités de ladite cartouche fusible 1, d'une part, un couvercle fermant une extrémité ouverte du corps 2, et, d'autre part, un couteau 5 traversant ledit couvercle et présentant une portion intérieure 6 s'étendant dans le corps 2 pour la fixation de l'élément fusible 3 ainsi qu'une portion extérieure 7 formant une borne de la cartouche fusible 1 pour son contact électrique et son maintien dans un socle correspondant.The invention therefore firstly relates to a fuse cartridge 1, comprising a body 2 in which there is a fuse element 3 for the safety of a current flow, and, at each of the two ends of said fuse cartridge 1, on the one hand, a cover closing an open end of the body 2, and, on the other hand, a knife 5 passing through said cover and having an inner portion 6 extending in the body 2 for fixing the element fuse 3 and an outer portion 7 forming a terminal of the fuse cartridge 1 for its electrical contact and its holding in a corresponding base.

La cartouche fusible 1 a la forme d'un élément allongé, et présente, à chacune de ses deux extrémités, une borne destinée au montage dans un socle. Dans la suite du texte, les longueurs correspondent aux dimensions mesurées le long de l'axe dans lequel s'étend le couteau 5, c'est à dire dans l'axe qui s'étend de l'une à l'autre des deux bornes de la cartouche fusible 1. Les épaisseurs correspondent aux dimensions mesurées dans l'axe qui s'étend de l'une à l'autre des deux zones de contact d'un couteau avec le socle. La hauteur est perpendiculaire à la longueur et à l'épaisseur.The fuse cartridge 1 has the shape of an elongated element, and has, at each of its two ends, a terminal intended for mounting in a base. In the remainder of the text, the lengths correspond to the dimensions measured along the axis in which the knife 5 extends, that is to say in the axis which extends from one to the other of the two. terminals of the fuse cartridge 1. The thicknesses correspond to the dimensions measured in the axis which extends from one to the other of the two contact zones of a knife with the base. The height is perpendicular to the length and the thickness.

Le contact électrique avec le socle est réalisé au niveau de cette borne. La borne est formée par la portion extérieure 7 du couteau 5, ce dernier présentant encore, à son autre extrémité, une portion intérieure 6, qui se trouve au sein du corps 2 et qui sert à la fixation de l'élément fusible 3, par soudure, brasage, vissage ou tout autre moyen.The electrical contact with the base is made at this terminal. The terminal is formed by the outer portion 7 of the knife 5, the latter still having, at its other end, an inner portion 6, which is located within the body 2 and which serves to fix the fuse element 3, by welding, brazing, screwing or any other means.

La cartouche fusible 1 est donc destinée à être montée dans un socle de branchement, comprenant deux zones de branchement, chacune pour accueillir une borne de ladite cartouche 1. Dans ce socle, la borne, formée par la portion extérieure 7 du couteau 5, vient se prendre entre deux pattes séparées par un entrefer normalement légèrement plus faible que l'épaisseur de la borne. Ainsi, les pattes maintiennent fermement la borne une fois celle-ci insérée. L'épaisseur de la borne, entre ces deux zones de contact, doit donc être de dimensions précises et correspondantes à un certain gabarit, afin de garantir la compatibilité de la cartouche avec le socle pour obtenir un bon serrage de la borne entre les pattes du socle, ce qui crée tant un bon contact électrique qu'un bon maintien mécanique.The fuse cartridge 1 is therefore intended to be mounted in a branch base, comprising two branching areas, each for receiving a terminal of said cartridge 1. In this base, the terminal, formed by the outer portion 7 of the knife 5, is caught between two legs separated by an air gap normally slightly smaller than the thickness of the terminal. Thus, the tabs firmly hold the terminal once it is inserted. The thickness of the terminal, between these two contact zones, must therefore be of precise dimensions and corresponding to a certain size, in order to guarantee the compatibility of the cartridge with the base to obtain a good tightening of the terminal between the legs of the terminal. base, which creates both a good electrical contact and a good mechanical support.

Dans l'art antérieur, c'est la partie métallique du couteau 5 qui épouse entièrement le gabarit, alors que, dans l'absolu, il suffirait que seules les parties réellement en contact avec les pattes du socle aient des bonnes propriétés de conductivité électrique. Il est donc envisageable d'utiliser une matière moins performante électriquement pour d'autres endroits de ce gabarit. Le revêtement d'argent, utilisé classiquement pour favoriser la bonne conductivité entre la borne et le socle, pourrait donc être limité aux zones qui viennent effectivement en contact avec le socle.In the prior art, it is the metal part of the knife 5 which fully conforms to the template, whereas, in absolute terms, it would be sufficient for only the parts actually in contact with the legs of the base to have good properties of electrical conductivity. . It is therefore possible to use a less electrically efficient material for other locations of this template. The silver coating, conventionally used to promote good conductivity between the terminal and the base, could therefore be limited to areas that actually come in contact with the base.

Ainsi, selon l'invention, le couteau 5 se présente sous la forme d'une âme 13 conductrice et d'un enrobage 8 qui la recouvre au niveau de la portion extérieure 7 mais à l'exception d'au moins une zone formant une pastille de contact 9 au niveau de laquelle la portion extérieure 7 du couteau métallique 5 peut venir au contact électrique du socle dans lequel la cartouche fusible 1 doit être montée. L'enrobage 8 peut être synthétique isolant, obtenu par surmoulage sur une âme 13 métallique placée comme un insert dans un outillage.Thus, according to the invention, the knife 5 is in the form of a conductive core 13 and a coating 8 which covers it at the level of the outer portion 7 but with the exception of at least one zone forming a contact pad 9 at which the outer portion 7 of the metal knife 5 can come into electrical contact with the base in which the fuse cartridge 1 is to be mounted. The coating 8 may be synthetic insulating, obtained by overmolding on a metal core 13 placed as an insert in a tool.

Le couteau 5 est donc un composant bi-matière associant, d'une part, une âme 13 métallique conductrice, ainsi qu'un enrobage 8. L'âme 13, au niveau de ses surfaces non couvertes par l'enrobage 8, est revêtue d'argent ou de tout autre revêtement superficiel ayant pour but d'améliorer la conductivité et la résistance à l'oxydation. Un tel revêtement est classiquement réalisé par galvanisation 104. L'enrobage 8 a pour but de limiter la surface de l'âme 13 qui sera effectivement recouverte d'un tel revêtement. L'enrobage 8 est fait en résine ou toute autre matière moins sensible que l'âme 13, voire inerte, à cette galvanisation 104.The knife 5 is therefore a bi-material component combining, on the one hand, a conductive metal core 13 and a coating 8. The core 13, at its surfaces not covered by the coating 8, is coated silver or any other surface coating intended to improve the conductivity and resistance to oxidation. Such a coating is conventionally made by galvanizing 104. The coating 8 is intended to limit the surface of the core 13 which will be effectively covered with such a coating. The coating 8 is made of resin or any other material less sensitive than the core 13, or inert, to this galvanization 104.

L'enrobage 8 est fait d'un matériau qui présente de bonnes caractéristiques de résistance mécanique et thermique, et qui est moins onéreux que le matériau de l'âme 13 ainsi que l'argent utilisé pour la galvanisation. Ce matériau, éventuellement une résine plastique isolante, est avantageusement réticent à recevoir le même dépôt superficiel que celui appliqué à l'âme 13, par le même procédé. La forme extérieure de la borne est donc définie par l'enrobage 8 ou par l'âme 13, aux endroits particuliers où cette dernière n'est pas masquée par ledit enrobage 8.The coating 8 is made of a material that has good mechanical and thermal resistance characteristics, and is less expensive than the material of the core 13 and the silver used for galvanizing. This material, possibly an insulating plastic resin, is advantageously reticent to receive the same superficial deposit as that applied to the core 13, by the same method. The external shape of the terminal is thus defined by the coating 8 or by the core 13, in particular places where the latter is not masked by said coating 8.

L'âme 13 est donc recouverte d'argent par galvanisation 104, sur toute sa surface non recouverte par l'enrobage 8, à savoir, d'une part, au moins une pastille de contact 9 avec le socle et préférentiellement deux, et, d'autre part, une zone de contact 12 pour la fixation de l'élément fusible 3 au niveau de la portion intérieure 6. Cette zone de contact 12 est préférentiellement d'épaisseur plus faible que le gabarit et de hauteur plus élevée que le gabarit. L'enrobage 8 arrive avantageusement à fleur des pastilles de contact 9, de sorte que l'enrobage 8 combiné avec l'âme 5 épouse complètement la forme du gabarit normalement épousé dans l'art antérieur par la partie métallique du couteau 5.The core 13 is thus coated with silver by galvanization 104, over its entire surface not covered by the coating 8, namely, on the one hand, at least one contact pad 9 with the base and preferably two, and, on the other hand, a contact zone 12 for fixing the fuse element 3 at the inner portion 6. This contact zone 12 is preferably of lower thickness than the template and of higher height than the template . The coating 8 is advantageously flush with the contact pads 9, so that the coating 8 combined with the core 5 completely matches the shape of the template normally matched in the prior art by the metal part of the knife 5.

Les deux pastilles de contact 9 de part et d'autre du couteau 5 se placent dans le contour du gabarit, le reste du gabarit épousant l'enrobage 8. Il est ainsi possible d'envisager, dans sa portion extérieure 7, une section d'âme 13 métallique plus faible que celle d'un couteau monomatière, tout en restant compatible avec le gabarit standard. La figure 1 laisse bien paraître ce gabarit, qui prend la forme d'un profilé dont la base est une section allongée se terminant par un coin arrondi pour faciliter l'insertion de la borne entre les pattes du socle. La présente description fait essentiellement référence à un enrobage surmoulé, bien que, dans l'absolu, d'autres types de procédés puissent aussi être utilisés pour réaliser l'enrobage 8 autour de l'âme 13.The two contact pads 9 on either side of the knife 5 are placed in the outline of the template, the remainder of the template conforming to the coating 8. It is thus possible to envisage, in its outer portion 7, a section of FIG. metal core 13 weaker than that of a monomatiere knife, while remaining compatible with the standard template. The figure 1 this template, which takes the form of a profile whose base is an elongated section ending in a rounded corner, makes it easy to insert the terminal between the legs of the base. The present description essentially refers to an overmoulded coating, although, in absolute terms, other types of methods can also be used to carry out the coating 8 around the core 13.

Selon une caractéristique additionnelle possible, l'enrobage 8 forme une partie massive du couteau 5 au niveau de la portion extérieure 7, la consistance dudit enrobage 8 étant supérieure à celle d'une simple peau ou couche de protection. La section de l'âme 13 représente préférentiellement moins des deux tiers de la section totale de la portion extérieure 7. Ainsi, au moins le tiers de cette section est formé par l'enrobage 8, moins coûteux, ce qui permet d'aboutir à des économies intéressantes de matière pour le couteau 5, tout en conservant la tenue mécanique ainsi qu'un échauffement acceptable généré par la circulation de courant dans une portion extérieure 7 de section plus petite que le gabarit.According to an additional possible feature, the coating 8 forms a solid portion of the knife 5 at the outer portion 7, the consistency of said coating 8 being greater than that of a simple skin or protective layer. The section of the core 13 preferably represents less than two-thirds of the total section of the outer portion 7. Thus, at least one-third of this section is formed by the coating 8, which is less expensive, which makes it possible to obtain interesting material savings for the knife 5, while maintaining the mechanical strength and an acceptable heating generated by the flow of current in an outer portion 7 of smaller section than the jig.

Il ne s'agit donc pas simplement de recouvrir l'âme 13 d'une fine couche de matière formant une épargne et qui limitera la surface sensible à la galvanisation 104, mais bien de former la borne de la cartouche fusible 1 comme un assemblage de deux pièces obtenu en particulier grâce à la fabrication par surmoulage.It is therefore not simply a question of covering the soul 13 with a thin layer of material forming a saving and which will limit the surface galvanically sensitive 104, but to form the terminal of the fuse cartridge 1 as a two-piece assembly obtained in particular by the overmolding manufacturing.

La borne de contact de la cartouche fusible 1 prend donc la forme d'une âme 13 métallique autour de laquelle se trouve un enrobage 8 de matière préférentiellement isolante, ce dernier épousant la forme du gabarit que doit présenter ladite borne, de sorte que l'âme 13 peut ainsi être de section bien plus faible que le gabarit et n'y déboucher qu'au niveau de deux pastilles de contact 9 où l'enrobage 8 est absent, et grâce auxquelles la cartouche fusible 1 vient au contact des pattes du socle. L'enrobage 8 occupe donc une partie substantielle de la borne et du gabarit dont elle reprend la forme, ledit enrobage 8 étant préférentiellement en matière synthétique isolante injectée par moulage autour de l'âme 13, en particulier de l'araldite.The contact terminal of the fuse cartridge 1 thus takes the form of a metal core 13 around which is a coating 8 of preferentially insulating material, the latter conforming to the shape of the template to be presented by said terminal, so that the core 13 can thus be of much smaller section than the template and lead to it only at the level of two contact pads 9 where the coating 8 is absent, and thanks to which the fuse cartridge 1 comes into contact with the legs of the base . The coating 8 thus occupies a substantial part of the terminal and the template of which it takes the form, said coating 8 preferably being made of insulating synthetic material injected by molding around the core 13, in particular araldite.

L'âme 13 du couteau métallique 5 est notamment réalisée à partir de cuivre, qui, après surmoulage de l'enrobage 8, est recouverte d'argent. Ainsi, dans la portion extérieure 7, seule la pastille de contact 9 est effectivement recouverte d'argent, le reste étant recouvert de l'enrobage 8 sur lequel l'argent ne se dépose pas.The core 13 of the metal knife 5 is made in particular of copper, which, after overmolding of the coating 8, is covered with silver. Thus, in the outer portion 7, only the contact pad 9 is effectively covered with silver, the rest being covered with the coating 8 on which the silver does not deposit.

Pour la dépose du revêtement, il est avantageux d'utiliser un procédé de galvanisation 104, où aucune interaction chimique n'aura lieu avec l'enrobage 8 éventuellement plastique, inerte. Cette particularité constitue une seconde source d'économies importantes.For the removal of the coating, it is advantageous to use a galvanizing process 104, where no chemical interaction will take place with the coating 8 possibly plastic, inert. This feature is a second source of significant savings.

Selon une caractéristique additionnelle possible, l'enrobage 8 définit aussi au moins une partie du couvercle. Ainsi, l'enrobage 8 peut former à lui seul l'intégralité du couvercle qui viendra ensuite se fixer dans le corps 2, préférentiellement par vissage. Dans d'autres modes de réalisation, l'enrobage 8 définit seulement une partie du couvercle, à savoir un flasque 4. Ce flasque 4 vient être maintenu entre le corps 2 et une plaque de maintien qui vient se visser dans ledit corps 2. Ce flasque 4 prend ainsi la forme d'une portion surmoulée sur l'âme 13 du couteau métallique 5 et qui constitue une assise du couteau 5 garantissant sa perpendicularité par rapport au reste du couvercle lorsqu'elle se trouve immobilisée entre le corps 2 et celui-ci.According to an additional possible feature, the coating 8 also defines at least part of the lid. Thus, the coating 8 can form alone the entire cover which will then be fixed in the body 2, preferably by screwing. In other embodiments, the coating 8 defines only a portion of the cover, namely a flange 4. This flange 4 is held between the body 2 and a holding plate which is screwed into said body 2. This flange 4 thus takes the form of a portion overmolded on the core 13 of the metal knife 5 and which constitutes a seat of the knife 5 ensuring its perpendicularity with respect to the remainder of the cover when it is immobilized between the body 2 and that- this.

Il est donc proposé de réaliser non seulement une partie de la borne de la cartouche fusible 1 avec un enrobage 8 isolant, mais aussi de former tout ou partie du couvercle par surmoulage sur le couteau métallique 5. L'enrobage 8 recouvre donc l'âme 5 au niveau de la portion extérieure 7, à l'exception des deux pastilles de contact 9 qui se font face, mais forme aussi le couvercle ou au moins un flasque 4 d'assise du couteau 5.It is therefore proposed to make not only part of the terminal of the fuse cartridge 1 with an insulating coating 8, but also to form all or part of the cover by overmolding on the metal knife 5. The coating 8 thus covers the core 5 at the outer portion 7, with the exception of the two contact pads 9 which face each other, but also forms the lid or at least one flange 4 of the seat knife 5.

Dans certains cas, il n'est donc plus nécessaire de réaliser d'opération de montage du couvercle sur le couteau 5, puisque le couvercle est éventuellement obtenu directement par surmoulage sur le couteau 5, ce surmoulage permettant simultanément de recouvrir une partie essentielle de la portion extérieure 7 du couteau 5. Le couvercle, ou son flasque 4 d'assise, et la matière recouvrant la portion extérieure 7 sont donc d'un seul tenant sous la forme de l'enrobage 8.In some cases, it is therefore no longer necessary to perform operation of mounting the cover on the knife 5, since the cover is optionally obtained directly by overmolding on the knife 5, overmolding simultaneously allowing to cover an essential part of the outer portion 7 of the knife 5. The lid, or its seat flange 4, and the material covering the outer portion 7 are therefore in one piece in the form of the coating 8.

Selon une caractéristique additionnelle possible, l'âme 13 présente, dans sa portion extérieure 7, deux premières zones 10 similaires et entre lesquelles se trouve une deuxième zone 11, l'épaisseur de la deuxième zone 11 étant plus élevée et la hauteur plus faible que pour les premières zones 10. Les deux pastilles de contact 9 sont en particulier prévues chacune d'un côté de la deuxième zone 11, cette dernière présentant donc une épaisseur correspondant au gabarit. La hauteur des premières zones 10, bien que supérieure à celle de la deuxième zone 11, n'st pas nécessairement égale à celle du gabarit, de sorte à réduire la surface galvanisée.According to an additional possible feature, the core 13 has, in its outer portion 7, two similar first zones 10 and between which there is a second zone 11, the thickness of the second zone 11 being higher and the height lower than for the first zones 10. The two contact pads 9 are in particular each provided on one side of the second zone 11, the latter therefore having a thickness corresponding to the template. The height of the first zones 10, although greater than that of the second zone 11, is not necessarily equal to that of the template, so as to reduce the galvanized surface.

Ainsi, l'âme 13 de la borne de la cartouche fusible 1, présente, au niveau des deux pastilles de contact 9, une épaisseur correspondant directement au gabarit et donc à la forme extérieure de la borne, la hauteur de la section de l'âme 13 à cet endroit étant bien plus faible que le gabarit, comme le montre la figure 2. De part et d'autre de cette deuxième zone 11, la portion extérieure 7 présente une première zone 10, cette dernière présentant une section d'épaisseur plus faible que celle de la deuxième zone 11, mais de hauteur plus élevée. La première zone 10 est donc haute dans la direction dans laquelle la deuxième zone 11 est petite, et fine dans la direction dans laquelle la deuxième zone 11 est épaisse. Les sections de la première zone 10 et du gabarit de borne lui-même sont donc allongées dans la même direction, à savoir celle de la hauteur.Thus, the core 13 of the terminal of the fuse cartridge 1, has, at the level of the two contact pads 9, a thickness corresponding directly to the template and therefore to the external shape of the terminal, the height of the section of the soul 13 at this point being much weaker than the template, as shown in figure 2 . On either side of this second zone 11, the outer portion 7 has a first zone 10, the latter having a section of smaller thickness than that of the second zone 11, but of higher height. The first zone 10 is therefore high in the direction in which the second zone 11 is small, and thin in the direction in which the second zone 11 is thick. The sections of the first zone 10 and the terminal jig itself are therefore elongate in the same direction, namely that of the height.

La forme de la première zone 10 contribue ainsi à rigidifier la borne correspondante de la cartouche fusible 1. La borne de la cartouche fusible 1 vient donc au contact du socle au niveau de la deuxième zone 11, portant, sur des faces parallèles, les deux pastilles de contact 9.The shape of the first zone 10 thus contributes to stiffening the corresponding terminal of the fuse cartridge 1. The terminal of the fuse cartridge 1 therefore comes into contact with the base at the second zone 11, bearing, on parallel faces, the two contact pads 9.

Selon une caractéristique additionnelle possible, l'âme 13 présente, au niveau de la portion intérieure 6 du couteau 5, une extrémité de contact 12 pour la fixation de l'élément fusible 3 dont la hauteur est plus élevée et l'épaisseur est plus faible que pour la partie extérieure 7, notamment pour la fixation par soudure, vissage, ou autres. L'extrémité de contact 12 n'est préférentiellement pas recouverte par l'enrobage 8, de sorte qu'un revêtement aux caractéristiques conductrices améliorées peut y être déposé comme sur le reste non recouvert de l'âme 13, ce qui amène une meilleure circulation d'électricité avec l'élément fusible 3 qui y est fixé.According to an additional possible feature, the core 13 has, at the inner portion 6 of the knife 5, an end of contact 12 for fixing the fuse element 3 whose height is higher and the thickness is lower than for the outer portion 7, in particular for attachment by welding, screwing, or other. The contact end 12 is preferably not covered by the coating 8, so that a coating with improved conductive characteristics can be deposited there as on the uncoated rest of the core 13, which leads to better circulation electricity with the fuse element 3 attached to it.

L'extrémité de contact 12 s'étend donc dans le sens de la hauteur, comme les deux premières zones 10, et peut avantageusement présenter, dans cette direction, une dimension encore plus grande que les premières zones 10, voire que le gabarit lui-même. En aménageant ainsi une surface de contact allongée dans la hauteur, la fixation de l'élément fusible 3 est beaucoup plus aisée, et la circulation de courant est plus avantageuse puisqu'elle peut être répartie sur une plus grande largeur. Ceci peut constituer, dans certains cas, une source d'économies supplémentaires, lorsque plusieurs éléments fusibles 3 doivent être disposées en parallèles entre les extrémités de contact 12 de chaque borne situées en vis-à-vis. En effet, un moindre nombre d'éléments de plus grande hauteur en parallèle offrent la même résistance globale qu'un nombre plus élevé d'éléments moins hauts.The contact end 12 therefore extends in the direction of the height, like the first two zones 10, and may advantageously have, in this direction, an even greater dimension than the first zones 10, or even the template itself. even. By thus providing an elongate contact surface in the height, the attachment of the fuse element 3 is much easier, and the flow of current is more advantageous since it can be spread over a wider width. This can be, in some cases, a source of additional savings, when several fusible elements 3 must be arranged in parallel between the contact ends 12 of each terminal located vis-à-vis. In fact, a smaller number of elements of greater height in parallel offer the same overall resistance than a higher number of lower elements.

De plus, le soudage de l'élément fusible 3 est d'autant plus aisé que l'âme 13 à cet endroit est d'épaisseur faible.In addition, the welding of the fuse element 3 is all the easier as the core 13 at this location is of low thickness.

Il convient de remarquer que, dans les cas où l'enrobage 8 ne s'étend pas sur la portion intérieure 6, cette dernière peut être entièrement recouverte d'argent. L'enrobage 8 recouvre donc l'âme 13 à l'exception de deux pastilles de contact 9 qui se font face ainsi que d'une extrémité de contact 12, située au niveau de la portion intérieure 6.It should be noted that, in cases where the coating 8 does not extend over the inner portion 6, the latter may be entirely covered with silver. The coating 8 thus covers the core 13 with the exception of two contact pads 9 which face each other as well as a contact end 12 situated at the level of the inner portion 6.

Selon une autre caractéristique additionnelle possible, illustrée en particulier à la figure 3, le couvercle s'étend au niveau d'une première zone 10, de sorte à assurer une bonne continuité de matière pour l'enrobage 8, en particulier autour de cette première zone 10. Le couvercle peut se situer au niveau d'une première zone 10 plus fine, la portion intérieure 6 étant formée d'une zone plus épaisse puis de l'extrémité de contact 12, à nouveau plus fine et plus haute.According to another possible additional feature, illustrated in particular in figure 3 , the lid extends at a first zone 10, so as to ensure a good continuity of material for the coating 8, in particular around this first zone 10. The lid can be located at a first zone 10 thinner, the inner portion 6 being formed of a thicker zone and then the contact end 12, again thinner and higher.

L'âme 13 du couteau 5 présente alors une forme dont la section présente successivement différentes géométries, comme le montre la figure 5 : une première zone 10, de hauteur élevée et d'épaisseur faible, puis une deuxième zone 11 suffisamment épaisse pour porter les pastilles de contact 9 qui arrivent au niveau du gabarit dont la borne reprend la forme, de hauteur plus faible que la première zone 10, puis une autre première zone 10, puis une éventuelle section équivalente à celle de la deuxième zone 11, puis, au niveau de la portion intérieure 6, une extrémité de contact 12, d'épaisseur encore plus faible et de hauteur encore plus élevée que pour la première zone 10.The core 13 of the knife 5 then has a shape whose section successively presents different geometries, as shown in FIG. figure 5 : a first zone 10, of high height and low thickness, then a second zone 11 sufficiently thick to carry the contact pads 9 which arrive at the template whose terminal takes the form, of lower height than the first zone 10, then another first zone 10, then a possible section equivalent to that of the second zone 11, then, at the inner portion 6, a contact end 12, of even smaller thickness and height even higher than for the first zone 10.

Comme le montre la figure 5, les premières zones 10 présentent des orifices débouchants qui favorisent le bon accrochage de l'enrobage 8 sur l'âme 13. Les parties plates et d'épaisseur faibles de l'âme 13 confèrent au couteau 5 la tenue mécanique nécessaire et une bonne cohésion avec l'enrobage 8.As shown in figure 5 , the first zones 10 have opening holes which promote the good adhesion of the coating 8 on the core 13. The flat and thin parts of the core 13 give the knife 5 the necessary mechanical strength and good cohesion with the coating 8.

L'invention a aussi pour objet un procédé de fabrication 100 d'une cartouche fusible 1 telle que décrite ci-dessus, et comprenant des étapes successives consistant à
débiter 101 un jonc de matière métallique,
déformer plastiquement par matriçage 102 le jonc débité pour former l'âme 13 d'un couteau 5,
surmouler 103 un enrobage 8 sur l'âme 13 du couteau 5, au niveau de la portion extérieure 7 et à l'exception d'au moins une pastille de contact 9, puis
revêtir le couteau 5, essentiellement au niveau de sa partie non recouverte par l'enrobage 8, d'un revêtement destiné à favoriser la conduction électrique,
l'enrobage 8 de matière étant significativement moins sensible au revêtement que ne l'est l'âme 13.The invention also relates to a method of manufacturing 100 a fuse cartridge 1 as described above, and comprising successive steps of
to cut 101 a ring of metallic material,
plastically deforming by punching 102 the deformed rod to form the core 13 of a knife 5,
overmould 103 a coating 8 on the core 13 of the knife 5, at the outer portion 7 and with the exception of at least one contact pad 9, then
coating the knife 5, essentially at its part not covered by the coating 8, with a coating intended to promote electrical conduction,
the coating 8 of material being significantly less sensitive to the coating than is the core 13.

L'étape de matriçage permet notamment de créer sur le jonc une extrémité de contact 12 pour la fixation de l'élément fusible 3 au niveau d'une portion intérieure 6, et/ou deux premières zones 10 similaires et entre lesquelles se trouve une deuxième zone 11, l'épaisseur de la deuxième zone 11 étant plus élevée et la hauteur plus faible que pour les premières zones 10, ces dernières étant ensuite recouvertes par l'enrobage 8. Le matriçage 102 permet aussi de réaliser la zone de contact d'épaisseur plus fine et de hauteur plus élevée que les premières zones 10, voire que le gabarit lui-même.The stamping step allows in particular to create on the rod a contact end 12 for fixing the fuse element 3 at an inner portion 6, and / or two similar first zones 10 and between which there is a second zone 11, the thickness of the second zone 11 being higher and the height lower than for the first zones 10, the latter being then covered by the coating 8. The stamping 102 also makes it possible to produce the contact zone of thinner thickness and higher height than the first 10 zones, or even the template itself.

A la différence des parties visibles de l'âme 13, l'enrobage 8 ne sera donc pas recouvert d'un matériau particulièrement intéressant électriquement. La surface de l'enrobage 8 et la au moins une pastille de contact 9 peuvent éventuellement être décalées, la pastille de contact 9 étant éventuellement légèrement décalée de l'enrobage 8 vers l'extérieur, pour éviter en particulier d'arracher de la matière de l'enrobage 8 et de l'amener entre la pastille de contact 9 et les pattes du socle.Unlike the visible parts of the core 13, the coating 8 will not be covered with a particularly interesting material electrically. The surface of the coating 8 and the at least one contact pad 9 can optionally be shifted, the contact pad 9 being optionally slightly offset from the coating 8 to the outside, in particular to avoid tearing of the material of the coating 8 and bring it between the contact pad 9 and the legs of the base.

Ainsi, non seulement la borne de la cartouche fusible 1 ne nécessite plus exclusivement du métal, mais le montage l'un sur l'autre de l'enrobage 8 et de la partie conductrice, à savoir l'âme 13 du couteau 5, est réalisé directement lors de la fabrication par surmoulage, ce qui réduit donc encore les coûts de fabrication.Thus, not only the terminal of the fuse cartridge 1 no longer exclusively requires metal, but the mounting on one another of the coating 8 and the conductive portion, namely the core 13 of the knife 5, is realized directly during manufacturing by overmolding, which further reduces manufacturing costs.

Selon une caractéristique additionnelle possible de l'invention, le matriçage 102 permet de former, au niveau de la portion intérieure 6, une zone d'épaisseur plus faible et de hauteur plus élevée que la portion extérieure 7 de sorte au moins à favoriser la fixation d'un élément fusible 3 sur l'extrémité de contact 12 ainsi obtenue.According to a possible additional feature of the invention, the stamping 102 makes it possible to form, at the level of the inner portion 6, an area of smaller thickness and height that is higher than the outer portion 7 so as to at least facilitate fixation. a fuse element 3 on the contact end 12 thus obtained.

La galvanisation 104 se fait donc essentiellement sur les surfaces de l'âme 13 métallique du couteau 5 restant apparentes, à savoir en particulier la ou les pastilles de contact 9 et l'extrémité de contact 12. La galvanisation 104 et la matière utilisée pour l'enrobage 8 ne sont toutefois pas adaptées l'une à l'autre, ce qui a pour conséquence que l'enrobage 8 n'est que peu ou n'est pas du tout recouvert d'argent ou autre matière utilisée pour le recouvrement. L'étape de galvanisation 104 peut donc être réglée pour un revêtement optimal des surfaces de l'âme 13 encore visibles et donc incompatible avec le réglage nécessaire pour obtenir un réel revêtement sur l'enrobage 8. Le matériau retenu pour l'enrobage 8 est donc choisi pour qu'une étape de galvanisation 104 adaptée au matériau de l'âme 13 ne crée sur l'enrobage 8 aucun revêtement ni dégradation. L'enrobage 8 est donc essentiellement inerte pour la galvanisation 104.The galvanization 104 is therefore essentially on the surfaces of the metal core 13 of the knife 5 remaining apparent, namely in particular the contact pad or pads 9 and the contact end 12. The galvanization 104 and the material used for the However, the coating 8 is not adapted to each other, with the result that the coating 8 is only slightly or not at all covered with silver or other material used for the covering. The galvanizing step 104 can therefore be adjusted for an optimal coating of the surfaces of the core 13 still visible and therefore incompatible with the adjustment necessary to obtain a real coating on the coating 8. The material retained for the coating 8 is therefore chosen so that a galvanizing step 104 adapted to the material of the core 13 does not create on the coating 8 any coating or degradation. The coating 8 is essentially inert for the galvanization 104.

Le jonc débité est préférentiellement essentiellement fait à base de cuivre, et présente une section constante. Comme il a déjà été dit, compte tenu du recours à la galvanisation 104, l'enrobage 8 n'est finalement pas recouvert d'argent, mais seules les pastilles de contact 9 qu'il laisse visibles et/ou l'extrémité de contact 12.The dispensed rod is preferably essentially made of copper, and has a constant section. As has already been said, given the use of galvanization 104, the coating 8 is finally not covered with silver, but only the contact pads 9 that it leaves visible and / or the contact end 12.

Le profil du jonc extrudé peut reprendre la section de la deuxième zone 11, elle-même correspondant au gabarit, le matriçage 102 étant effectué de part et d'autre pour aplatir ledit jonc et former ainsi au moins des premières zones 10. Ainsi, l'enrobage 8 vient contre le flanc plat et fin que forme chaque première zone 10, alors qu'il complète perpendiculairement la deuxième zone 11. Les sections du couteau 5 qui sont plus plates que la deuxième zone 11 sont donc obtenues par écrasement d'un jonc de section constante, avantageusement non déformé au niveau de la deuxième zone 11 portant les pastilles de contact 9, voire aussi entre la section similaire séparant l'une des premières zones 10 de l'extrémité de contact 12.The profile of the extruded rod can take up the section of the second zone 11, itself corresponding to the template, the stamping 102 being carried out on both sides to flatten said ring and thus form at least first zones 10. Thus, the coating 8 comes against the flat and thin side formed by each first zone 10, while it completes perpendicularly the second zone 11. The sections of the knife 5 which are flatter than the second zone 11 are thus obtained by crushing a ring of constant section, advantageously not deformed at the second zone 11 carrying the contact pads 9, or even between the similar section separating one of the first zones 10 from the contact end 12.

Ces parties d'épaisseur fine étant obtenues par matriçage 102, l'épaisseur de l'extrémité de contact 12 peut être plus faible que celle des premières zones 10, dans la mesure où sa hauteur est encore plus élevée que celle des deux premières zones 10, elle-même plus élevée que celle de la deuxième zone 11.These thin-thickness portions being obtained by stamping 102, the thickness of the contact end 12 may be smaller than that of the first zones 10, inasmuch as its height is even higher than that of the first two zones 10 itself higher than that of the second zone 11.

Selon une autre caractéristique additionnelle possible, recouvrir la surface extérieure du couteau 5 se fait par galvanisation 104 d'argent adaptée à l'âme 13 et non à l'enrobage 8 de sorte que l'âme 13, et en particulier les pastilles de contact 9, est recouverte d'argent, l'enrobage 8 n'étant pas ou pratiquement pas recouvert d'argentAccording to another possible additional feature, covering the outer surface of the knife 5 is made by silver galvanization 104 adapted to the core 13 and not to the coating 8 so that the core 13, and in particular the contact pads 9, is covered with silver, the coating 8 not being or almost not covered with silver

Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et représentés aux dessins annexés. Des modifications restent possibles, notamment du point de vue de la constitution des divers éléments, par combinaison différente de tout ou partie des caractéristiques décrites ci-dessus, ou par substitution d'équivalents techniques, sans sortir pour autant du domaine de protection de l'invention.Of course, the invention is not limited to the embodiments described and shown in the accompanying drawings. Modifications are possible, in particular from the point of view of the constitution of the various elements, by different combination of all or part of the characteristics described above, or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims (9)

Cartouche fusible (1), comprenant un corps (2) dans lequel se trouve un élément fusible (3) pour la sécurité d'une circulation de courant, ainsi que, à chacune des deux extrémités de ladite cartouche fusible (1), d'une part, un couvercle fermant une extrémité ouverte du corps (2), et, d'autre part, un couteau (5) traversant ledit couvercle et présentant une portion intérieure (6) s'étendant dans le corps (2) pour la fixation de l'élément fusible (3) ainsi qu'une portion extérieure (7) formant une borne de la cartouche fusible (1) pour son contact électrique et son maintien dans un socle correspondant, le couteau (5) étant préférentiellement métallique,
cartouche fusible (1) caractérisée en ce que
le couteau (5) se présente sous la forme d'une âme (13) conductrice et d'un enrobage (8) qui la recouvre au niveau de la portion extérieure (7) mais à l'exception d'au moins une zone formant une pastille de contact (9) au niveau de laquelle la portion extérieure (7) du couteau métallique (5) peut venir au contact électrique du socle dans lequel la cartouche fusible (1) doit être montée.Fuse cartridge (1), comprising a body (2) in which there is a fuse element (3) for the safety of a current flow, and at each of the two ends of said fuse cartridge (1), on the one hand, a lid closing an open end of the body (2), and, on the other hand, a knife (5) passing through said lid and having an inner portion (6) extending into the body (2) for fixing of the fuse element (3) and an outer portion (7) forming a terminal of the fuse cartridge (1) for its electrical contact and its holding in a corresponding base, the knife (5) being preferably metallic,
fuse cartridge (1) characterized in that
the knife (5) is in the form of a conductive core (13) and a coating (8) which covers it at the level of the outer portion (7) but with the exception of at least one zone forming a contact pad (9) at which the outer portion (7) of the metal knife (5) can come into electrical contact with the base in which the fuse cartridge (1) is to be mounted. Cartouche fusible (1) selon la revendication 1, caractérisée en ce que
l'enrobage (8) forme une partie massive du couteau (5) au niveau de la portion extérieure (7), la consistance dudit enrobage (8) étant supérieure à celle d'une simple peau ou couche de protection.Fuse cartridge (1) according to claim 1, characterized in that
the coating (8) forms a solid part of the knife (5) at the outer portion (7), the consistency of said coating (8) being greater than that of a simple skin or protective layer. Cartouche fusible (1) selon l'une quelconque des revendications 1 ou 2, caractérisée en ce que
l'enrobage (8) définit aussi au moins une partie du couvercle.Fuse cartridge (1) according to one of Claims 1 or 2, characterized in that
the coating (8) also defines at least a part of the lid. Cartouche fusible (1) selon l'une quelconque des revendications 1 à 3, caractérisée en ce que
l'âme (13) présente, dans sa portion extérieure (7), deux premières zones (10) similaires et entre lesquelles se trouve une deuxième zone (11), l'épaisseur de la deuxième zone (11) étant plus élevée et la hauteur plus faible que pour les premières zones (10).Fuse cartridge (1) according to one of Claims 1 to 3, characterized in that
the core (13) has, in its outer portion (7), two similar first zones (10) and between which there is a second zone (11), the thickness of the second zone (11) being higher and the height lower than for the first zones (10). Cartouche fusible (1) selon l'une quelconque des revendications 1 à 4, caractérisée en ce que
l'âme (13) présente, au niveau de la portion intérieure (6) du couteau (5), une extrémité de contact (12) pour la fixation de l'élément fusible (3) dont la hauteur est plus élevée et l'épaisseur est plus faible que pour la partie extérieure (7).Fuse cartridge (1) according to one of Claims 1 to 4, characterized in that
the core (13) has, at the inner portion (6) of the knife (5), a contact end (12) for fixing the element fuse (3) whose height is higher and the thickness is lower than for the outer part (7). Cartouche fusible (1) selon la revendication 2 et selon la revendication 5, caractérisée en ce que
le couvercle s'étend au niveau d'une première zone (10), de sorte à assurer une bonne continuité de matière pour l'enrobage (8).Fuse cartridge (1) according to Claim 2 and according to Claim 5, characterized in that
the lid extends at a first zone (10), so as to ensure a good continuity of material for the coating (8). Procédé de fabrication (100) d'une cartouche fusible (1) selon l'une quelconque des revendications 1 à 6, comprenant des étapes successives consistant à
débiter (101) un jonc de matière métallique,
déformer plastiquement par matriçage (102) le jonc débité pour former l'âme (13) d'un couteau (5),
surmouler (103) un enrobage (8) sur l'âme (13) du couteau (5), au niveau de la portion extérieure (7) et à l'exception d'au moins une pastille de contact (9), puis
revêtir le couteau (5), essentiellement au niveau de sa partie non recouverte par l'enrobage (8), d'un revêtement destiné à favoriser la conduction électrique,
l'enrobage (8) de matière étant significativement moins sensible au revêtement que ne l'est l'âme (13).A method of manufacturing (100) a fusible cartridge (1) according to any one of claims 1 to 6, comprising successive steps of
debiting (101) a ring of metallic material,
plastically deforming by punching (102) the deformed rod to form the core (13) of a knife (5),
overmolding (103) a coating (8) on the core (13) of the knife (5), at the outer portion (7) and except for at least one contact pad (9), and
coating the knife (5), essentially at its portion not covered by the coating (8), with a coating intended to promote electrical conduction,
the coating (8) of material being significantly less sensitive to the coating than the core (13). Procédé de fabrication (100) selon la revendication 7, caractérisé en ce que
le matriçage (102) permet de former, au niveau de la portion intérieure (6), une zone d'épaisseur plus faible et de hauteur plus élevée que la portion extérieure (7) de sorte au moins à favoriser la fixation d'un élément fusible (3) sur l'extrémité de contact (12) ainsi obtenue.Manufacturing method (100) according to claim 7, characterized in that
the stamping (102) makes it possible to form, at the level of the inner portion (6), a zone of smaller thickness and height higher than the outer portion (7) so as at least to favor the fixing of an element fuse (3) on the contact end (12) thus obtained. Procédé de fabrication (100) selon la revendication 8, caractérisé en ce que recouvrir la surface extérieure du couteau (5) se fait par galvanisation (104) d'argent adaptée à l'âme (13) et non à l'enrobage (8) de sorte que l'âme (13), et en particulier les pastilles de contact (9), est recouverte d'argent, l'enrobage (8) n'étant pas ou pratiquement pas recouvert d'argent.Manufacturing method (100) according to claim 8, characterized in that covering the outer surface of the knife (5) is by galvanization (104) of silver adapted to the core (13) and not to the coating (8). ) so that the core (13), and in particular the contact pads (9), is covered with silver, the coating (8) being not or almost not covered with silver.
EP13305680.4A 2013-05-24 2013-05-24 Fuse cartridge with bi-material knife Withdrawn EP2806450A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13305680.4A EP2806450A1 (en) 2013-05-24 2013-05-24 Fuse cartridge with bi-material knife

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13305680.4A EP2806450A1 (en) 2013-05-24 2013-05-24 Fuse cartridge with bi-material knife

Publications (1)

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EP2806450A1 true EP2806450A1 (en) 2014-11-26

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US195089A (en) 1877-09-11 Improvement in bee-hives
US389979A (en) 1888-09-25 Eoldin s
US1566852A (en) 1923-08-08 1925-12-22 John B Glowacki Cartridge-fuse knife-blade type for renewable fuse elements
DE759073C (en) * 1940-03-12 1953-07-06 Aeg Fuse with contact blades
DE947914C (en) * 1952-06-24 1956-08-23 Licentia Gmbh Fuse contact knife with interrupted contact surface
CH348452A (en) * 1955-05-20 1960-08-31 Licentia Gmbh Fusible link for low-voltage high-performance fuses with tubular contact blades
US3134001A (en) 1961-03-21 1964-05-19 Chase Shawmut Co Knife blade type fuse having silverplated blade contacts
FR2630584A1 (en) 1988-04-20 1989-10-27 Legrand Sa Bladed cartridge with fuse strip welded to the outside of the fusion chamber
FR2679378A1 (en) 1991-07-15 1993-01-22 Wechsler Daniel Electrical fuse for heavy currents
US5736918A (en) * 1996-06-27 1998-04-07 Cooper Industries, Inc. Knife blade fuse having an electrically insulative element over an end cap and plastic rivet to plug fill hole

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US195089A (en) 1877-09-11 Improvement in bee-hives
US389979A (en) 1888-09-25 Eoldin s
US1566852A (en) 1923-08-08 1925-12-22 John B Glowacki Cartridge-fuse knife-blade type for renewable fuse elements
DE759073C (en) * 1940-03-12 1953-07-06 Aeg Fuse with contact blades
DE947914C (en) * 1952-06-24 1956-08-23 Licentia Gmbh Fuse contact knife with interrupted contact surface
CH348452A (en) * 1955-05-20 1960-08-31 Licentia Gmbh Fusible link for low-voltage high-performance fuses with tubular contact blades
US3134001A (en) 1961-03-21 1964-05-19 Chase Shawmut Co Knife blade type fuse having silverplated blade contacts
FR2630584A1 (en) 1988-04-20 1989-10-27 Legrand Sa Bladed cartridge with fuse strip welded to the outside of the fusion chamber
FR2679378A1 (en) 1991-07-15 1993-01-22 Wechsler Daniel Electrical fuse for heavy currents
US5736918A (en) * 1996-06-27 1998-04-07 Cooper Industries, Inc. Knife blade fuse having an electrically insulative element over an end cap and plastic rivet to plug fill hole

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