EP0154801B1 - Miniature fuse and method of fabrication therefor - Google Patents

Miniature fuse and method of fabrication therefor Download PDF

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Publication number
EP0154801B1
EP0154801B1 EP85101136A EP85101136A EP0154801B1 EP 0154801 B1 EP0154801 B1 EP 0154801B1 EP 85101136 A EP85101136 A EP 85101136A EP 85101136 A EP85101136 A EP 85101136A EP 0154801 B1 EP0154801 B1 EP 0154801B1
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EP
European Patent Office
Prior art keywords
conductors
conductor
mounting
base
receptacle
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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
EP85101136A
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German (de)
French (fr)
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EP0154801A3 (en
EP0154801A2 (en
Inventor
Werner Marx
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Wickmann Werke GmbH
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Wickmann Werke GmbH
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Priority to AT85101136T priority Critical patent/ATE42866T1/en
Publication of EP0154801A2 publication Critical patent/EP0154801A2/en
Publication of EP0154801A3 publication Critical patent/EP0154801A3/en
Application granted granted Critical
Publication of EP0154801B1 publication Critical patent/EP0154801B1/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00Protective 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
    • H01H85/02Details
    • H01H85/04Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/0411Miniature fuses
    • H01H85/0415Miniature fuses cartridge type
    • H01H85/0417Miniature fuses cartridge type with parallel side contacts

Definitions

  • the invention relates to a miniature fuse, consisting of a plastic base, a plastic cap and two conductors passing through the base, which are bridged within the cap by a fusible conductor soldered to the conductors, a receptacle for the fusible conductor being formed on each conductor above the base and the Connection between the receptacle and the fusible conductor is melted by melting soft solder, as well as a manufacturing process for this miniature fuse.
  • the invention is suitable for all fuses in which a fusible conductor is to be fastened to it in a transverse position, and for other electrical components on which another conductor is to be securely fastened to a conductor transversely to the latter. Since the invention is to be used preferably for miniature fuses of the above type, the invention is explained below only with reference to miniature fuses.
  • the fuse element When producing miniature fuses, the fuse element is softly soldered in the area of the ends of the pin-shaped conductors above the base. Especially when using fusible conductors made of very thin wire, the soldering is carried out by hand in order to establish a reliable connection between the conductors and the fusible conductor.
  • FR-PS 948 836 It is already known (FR-PS 948 836) to insert the fusible conductor ends in grooves or slots at the upper end of the two conductors before the fusible conductor ends are fastened by a solder application.
  • the fuse element can fall out of the slot in the course of further assembly if, for example, an immersion bath is used to apply the solder, and the conductors for this purpose are guided through the bath with the upper ends hanging downward.
  • the fuse element can also slide out of the slot later in use of the fuse if the fuse is arranged, for example, on heat-emitting printed circuit boards or in a housing exposed to heating, where there is a risk that the solder will soften.
  • the heat transferred can influence the soldering point between the connecting pin and the fuse element in such a way that the soldered connection is opened in the worst case.
  • the object of the invention is therefore to create a secure attachment of the fuse element to the conductors.
  • the extraordinarily small dimensions of the fusible link and the conductor must be taken into account, as well as the fact that fuses of the type concerned here are a typical mass-produced item, with which even a small additional effort drastically increases the overall manufacturing costs can cause.
  • the receptacle is formed by rolling in or bending the upper end of the conductor in the manner of an eyelet for embracing and holding the fuse element.
  • the fuse element receives an additional fastening by means of an eyelet-type receptacle through which the fuse element is caught.
  • a mechanical or positive connection is thus established between the fuse element and each of the two conductors of the miniature fuse before soft solder is additionally applied to the connection point. It is sufficient if the fuse element is initially only gripped and held by the receptacle and is finally secured by the soft soldering.
  • the possibilities for training the receptacle to perform this holding function are correspondingly diverse.
  • the fuse element can either be retracted or hooked into this receptacle shaped like an eyelet, depending on whether the receptacle completely or partially encompasses the fuse element, or the fuse element is placed on the conductor before it is rolled or bent so that after the formation of the receptacle of the fuse element is already in this.
  • the upper end of the conductor is expediently shaped flat, namely flattened, and recesses or notches are preferably provided in the region of the receptacle.
  • the conductors which are usually round in cross section, are shaped flat for fastening the fuse element, so that the receptacle encloses the fuse element with a flat section.
  • the notches are very important for the quality of the soldering because the solder not only adheres to the fuse element on both sides of the receptacle, but also reaches the fuse element through the notch and creates additional bridges between the fuse element and the receptacle or the conductor.
  • solder adheres to the jagged surface of the receptacle much better than if the receptacle had a smooth surface.
  • this form of the receptacle also has a certain capillary action when the liquid soft solder is applied, which contributes to a further improvement in the strength of the soldered connection.
  • a particularly economical method for producing the miniature fuse according to the invention is that a plurality of bases with inserted conductors, at de ren upper ends of the receptacle is prepared, aligned in a row next to each other, a continuous fusible conductor thread is stretched across the upper ends of the conductors in a stretched position and predetermined height, the recording by rolling or bending the upper ends of the conductors to embrace and holding the fusible conductor thread is formed, the soft solder is applied to the receptacle and the fusible conductor in this area and the connecting pieces between the fused conductors are separated. Then the fastening area is reground, cleaned and cleaned if necessary, whereupon the cap is placed on the base and fastened.
  • the preparation of the shape of the receptacle at the upper end of each conductor depending on the desired shape of the receptacle, for example in tilting, namely in a slight bending of the end of the conductor if the receptacle is to be produced by curling.
  • the flat forming and the production of an elongated cutout in the conductor above the base are also part of the preparatory work before the fuse element thread is attached. It is essential that a large number of units consisting of bases with inserted conductors are processed simultaneously by arranging the pedestals in a row in an aligned manner side by side.
  • the fusible conductor thread which runs simultaneously over the entire row of conductors, is encompassed and held by the upper ends of the conductors during the manufacture of the receptacle by rolling or bending the upper ends of the conductor, so that the solder can be melted in the further operation, and then the so separated formed fuse element from the common thread, whereupon the remaining work can be carried out.
  • a plastic base which is circular in cross section, is provided on its circumference with ribs 2 for fastening a plastic cap, not shown, and with two pin-shaped conductors 3 which pass through and are anchored in this base and whose contact pins are used, for example, to connect to circuit boards below the base Protrude base 1.
  • the conductors 3 are shaped flat and, as shown, have elongate cutouts 4. These flattened sections of the conductors 3 are rolled in with the inclusion of a dash-dotted fuse element 6 to form a receptacle 5 comprising the fuse element 6, as illustrated in FIG. 2, and after prior tilting at position 7.
  • the solder is then applied 8, followed by the separation of protruding fusible conductor parts, so that finally the final state according to FIG. 3 results.
  • a device 10 which is in the form of a strip, aligned in a row next to one another. If the flattening of the conductors 3 has already taken place before they are inserted into the base 1, the processing in the device 10 begins with the application of a fusible conductor thread 9 in an extended position to all conductors 3. Now the conductor 3, which is attached to the Position 7 are tilted so that the fusible conductor thread 9 is subsequently captured or encompassed by the receptacle 5 formed, as shown in FIG. 2 by the designation of the fusible conductor 6.
  • the individual fusible conductors 6 are separated therefrom, namely cut off from the common thread, and any necessary remaining work is carried out at the connection points, whereupon the cap (not shown) is placed on the Socket 1 is placed and firmly connected to it.
  • the same size of the eyelet-shaped receptacle 5 for Fusible conductors of different diameters can be used. This is because the gap between the fuse element and the receptacle 5 fills the solder 8 in each case, of which as much flows into the receptacle 5 as is needed to fill the gap.
  • an even greater capillary effect results from the larger space between it and the receptacle 5, ie the solder 8 is drawn into the eyelet-shaped receptacle 5.
  • the receptacle 5 forms a natural protection of the soldered connection against any kind of impairment of the fastening, also against direct mechanical action, especially also in the further course of the production.

Abstract

A sub-miniature fuse comprises a plastic base, and two conductors passing through the base and being bridged by a fuse wire soldered to the conductors. For obtaining a reliable fixture of the fuse wire to the conductors a fuse wire holder is formed on each of these conductors above the base and the connection between said holder and the fuse wire positioned in the latter is secured by melting on soft solder material. It is particularly advantageous to construct the holder by rolling up or bending over the upper end of each conductor.

Description

Die Erfindung betrifft eine Kleinstsicherung, bestehend aus einem Kunststoffsockel, einer Kunststoffkappe und zwei durch den Sockel hindurchtretenden Leitern, die innerhalb der Kappe durch einen an den Leitern angelöteten Schmelzleiter überbrückt sind, wobei an jedem Leiter oberhalb des Sockels eine Aufnahme für den Schmelzleiter gebildet und die Verbindung zwischen der Aufnahme und dem Schmelzleiter durch Aufschmelzen von Weichlot gefestigt ist, sowie ein Herstellungsverfahren für diese Kleinstsicherung.The invention relates to a miniature fuse, consisting of a plastic base, a plastic cap and two conductors passing through the base, which are bridged within the cap by a fusible conductor soldered to the conductors, a receptacle for the fusible conductor being formed on each conductor above the base and the Connection between the receptacle and the fusible conductor is melted by melting soft solder, as well as a manufacturing process for this miniature fuse.

Darüber hinaus eignet sich die Erfindung für alle Schmelzsicherungen, bei denen ein Schmelzleiter in Querlage an diesem zu befestigen ist, sowie für sonstige elektrische Bauelemente, an denen an einem Leiter quer zu diesem ein anderer Leiter sicher befestigt werden soll. Da die Erfindung bevorzugt für Kleinstsicherungen der vorstehenden Art verwendet werden soll, wird die Erfindung im folgenden ausschliesslich mit Bezug auf Kleinstsicherungen erläutert.In addition, the invention is suitable for all fuses in which a fusible conductor is to be fastened to it in a transverse position, and for other electrical components on which another conductor is to be securely fastened to a conductor transversely to the latter. Since the invention is to be used preferably for miniature fuses of the above type, the invention is explained below only with reference to miniature fuses.

Bei der Herstellung von Kleinstsicherungen wird der Schmelzleiter im Bereich der Enden der stiftförmigen Leiter oberhalb des Sockels weich aufgelötet. Insbesondere bei Verwendung von Schmelzleitern aus sehr dünnem Draht erfolgt die Verlötung von Hand, um eine zuverlässige Verbindung zwischen den Leitern und dem Schmelzleiter herzustellen.When producing miniature fuses, the fuse element is softly soldered in the area of the ends of the pin-shaped conductors above the base. Especially when using fusible conductors made of very thin wire, the soldering is carried out by hand in order to establish a reliable connection between the conductors and the fusible conductor.

Aber selbst wenn dieser Lötvorgang mit grösster Sorgfalt durchgeführt wird, ist die damit erreichbare Befestigung nicht allen Beanspruchungen gewachsen, denen die Kleinstsicherung im Laufe der weiteren Verarbeitung und besonders dem späteren Gebrauch ausgesetzt ist.But even if this soldering process is carried out with the greatest care, the fastening that can be achieved with it cannot withstand all the stresses to which the miniature fuse is exposed in the course of further processing and especially later use.

Es ist zwar bereits bekannt (FR-PS 948 836), die Schmelzleiterenden in Nuten oder Schlitze am oberen Ende der beiden Leiter einzulegen, ehe die Befestigung der Schmelzleiterenden durch einen Lotauftrag erfolgt. Der Schmelzleiter kann jedoch im Lauf der weiteren Montage aus dem Schlitz herausfallen, wenn beispielsweise ein Tauchbad für das Aufbringen des Schmelzlotes benutzt und die Leiter hierfür mit den oberen Enden nach unten hängend durch das Bad geführt werden. Der Schmelzleiter kann auch noch später im Gebrauch der Sicherung aus dem Schlitz herausgleiten, wenn die Sicherung beispielsweise auf Hitze abstrahlenden Leiterplatten oder in einem einer Erwärmung ausgesetzten Gehäuse angeordnet ist, wo die Gefahr besteht, dass das Lot aufweicht.It is already known (FR-PS 948 836) to insert the fusible conductor ends in grooves or slots at the upper end of the two conductors before the fusible conductor ends are fastened by a solder application. However, the fuse element can fall out of the slot in the course of further assembly if, for example, an immersion bath is used to apply the solder, and the conductors for this purpose are guided through the bath with the upper ends hanging downward. The fuse element can also slide out of the slot later in use of the fuse if the fuse is arranged, for example, on heat-emitting printed circuit boards or in a housing exposed to heating, where there is a risk that the solder will soften.

Überhaupt kann beim Einlöten der Kleinstsicherungen in Leiterplatten die übertragene Wärme die Lötstelle zwischen Anschlussstift und Schmelzleiter derart beeinflussen, dass im ungünstigsten Fall die Lötverbindung aufgeht.In general, when the miniature fuses are soldered into printed circuit boards, the heat transferred can influence the soldering point between the connecting pin and the fuse element in such a way that the soldered connection is opened in the worst case.

Der Erfindung liegt daher die Aufgabe zugrunde, eine sichere Befestigung des Schmelzleiters an den Leitern zu schaffen. Bei der gewünschten Verbesserung der Befestigung sind die ausserordentlich kleinen Abmessungen der Schmelzleiter und der Leiter ebenso zu berücksichtigen wie die Tatsache, dass es sich bei Sicherungen der hier betroffenen Art um einen typischen Massenartikel handelt, bei dem schon ein geringfügiger Mehraufwand eine drastische Steigerung der Fertigungskosten insgesamt verursachen kann.The object of the invention is therefore to create a secure attachment of the fuse element to the conductors. In the case of the desired improvement in the fastening, the extraordinarily small dimensions of the fusible link and the conductor must be taken into account, as well as the fact that fuses of the type concerned here are a typical mass-produced item, with which even a small additional effort drastically increases the overall manufacturing costs can cause.

Zur Lösung der Aufgabe ist erfindungsgemäss vorgesehen, dass die Aufnahme durch Einrollen oder Umbiegen des oberen Endes des Leiters nach Art einer Öse zum Umfassen und Halten des Schmelzleiters gebildet ist.To achieve the object, it is provided according to the invention that the receptacle is formed by rolling in or bending the upper end of the conductor in the manner of an eyelet for embracing and holding the fuse element.

Nach dieser Lösung erhält der Schmelzleiter neben der Lötung eine zusätzliche Befestigung durch eine Aufnahme nach Art einer Öse, durch die der Schmelzleiter erfasst wird. Es wird also eine mechanische bzw. formschlüssige Verbindung zwischen dem Schmelzleiter und jedem der beiden Leiter der Kleinstsicherung hergestellt, ehe zusätzlich Weichlot auf die Verbindungsstelle aufgebracht wird. Dabei reicht es aus, wenn der Schmelzleiter von der Aufnahme zunächst nur umfasst und gehalten wird und seine endgültige Befestigung durch die Weichlötung erhält. Entsprechend vielseitig sind die Möglichkeiten für die Ausbildung der Aufnahme zur Ausführung dieser Haltefunktion. In diese nach Art einer Öse geformte Aufnahme lässt sich der Schmelzleiter entweder nachträglich einziehen oder einhängen, je nachdem, ob die Aufnahme den Schmelzleiter ganz oder nur teilweise umfasst, oder man legt den Schmelzleiter bereits vor dem Einrollen oder Umbiegen auf den Leiter, so dass sich nach der Ausformung der Aufnahme der Schmelzleiter bereits in dieser befindet.According to this solution, in addition to the soldering, the fuse element receives an additional fastening by means of an eyelet-type receptacle through which the fuse element is caught. A mechanical or positive connection is thus established between the fuse element and each of the two conductors of the miniature fuse before soft solder is additionally applied to the connection point. It is sufficient if the fuse element is initially only gripped and held by the receptacle and is finally secured by the soft soldering. The possibilities for training the receptacle to perform this holding function are correspondingly diverse. The fuse element can either be retracted or hooked into this receptacle shaped like an eyelet, depending on whether the receptacle completely or partially encompasses the fuse element, or the fuse element is placed on the conductor before it is rolled or bent so that after the formation of the receptacle of the fuse element is already in this.

Das obere Ende des Leiters ist zweckmässig flach geformt, nämlich abgeflacht, und im Bereich der Aufnahme sind vorzugsweise Ausnehmungen oder Ausklinkungen vorgesehen. Die im Querschnitt gewöhnlich runden Leiter werden für die Befestigung des Schmelzleiters flach geformt, so dass die Aufnahme den Schmelzleiter mit einem flächenhaften Abschnitt umschliesst. Die Ausklinkungen sind für Qualität der Lötung sehr wesentlich, weil das Lötzinn so an dem Schmelzleiter nicht nur beiderseits der Aufnahme haftet, sondern den Schmelzleiter auch durch die Ausklinkung hindurch erreicht und zusätzliche Brücken zwischen dem Schmelzleiter und der Aufnahme bzw. dem Leiter schafft. Darüber hinaus haftet das Lötzinn an der in dieser Weise zerklüfteten Oberfläche der Aufnahme wesentlich besser als im Falle einer glattflächigen Ausbildung der Aufnahme. Schliesslich geht von dieser Form der Aufnahme auch eine gewisse Kapillarwirkung beim Aufbringen des flüssigen Weichlots aus, was zu einer weiteren Verbesserung der Festigkeit der Lötverbindung beiträgt.The upper end of the conductor is expediently shaped flat, namely flattened, and recesses or notches are preferably provided in the region of the receptacle. The conductors, which are usually round in cross section, are shaped flat for fastening the fuse element, so that the receptacle encloses the fuse element with a flat section. The notches are very important for the quality of the soldering because the solder not only adheres to the fuse element on both sides of the receptacle, but also reaches the fuse element through the notch and creates additional bridges between the fuse element and the receptacle or the conductor. In addition, the solder adheres to the jagged surface of the receptacle much better than if the receptacle had a smooth surface. Finally, this form of the receptacle also has a certain capillary action when the liquid soft solder is applied, which contributes to a further improvement in the strength of the soldered connection.

Es hat sich gezeigt, dass an dem oberen flach geformten Ende des Leiters die Ausbildung eines länglichen Ausschnitts zur .Erzielung der vorgenannten Wirkungen am vorteilhaftesten ist.It has been shown that at the upper flat-shaped end of the conductor the formation of an elongated cutout for . Achieving the above effects is most advantageous.

Ein besonders wirtschaftliches Verfahren zur Herstellung der erfindungsgemässen Kleinstsicherung besteht nach der Erfindung darin, dass mehrere Sockel mit eingesetzten Leitern, an deren oberen Enden die Aufnahme vorbereitet ist, in einer Reihe ausgerichtet nebeneinander angeordnet werden, ein durchgehender Schmelzleiterfaden in gestreckter Lage und vorgegebener Höhe quer über die oberen Enden der Leiter an diese angelegt wird, die Aufnahme durch Einrollen oder Umbiegen der oberen Enden der Leiter zum Umfassen und Halten des Schmelzleiterfadens gebildet wird, das Weichlot auf die Aufnahme und den Schmelzleiter in diesem Bereich aufgebracht wird und die Verbindungsstücke zwischen den gebildeten Schmelzleitern abgetrennt werden. Danach wird der Befestigungsbereich gegebenenfalls nachgeschliffen, geputzt und gesäubert, worauf die Kappe auf den Sockel aufgesetzt und befestigt wird.According to the invention, a particularly economical method for producing the miniature fuse according to the invention is that a plurality of bases with inserted conductors, at de ren upper ends of the receptacle is prepared, aligned in a row next to each other, a continuous fusible conductor thread is stretched across the upper ends of the conductors in a stretched position and predetermined height, the recording by rolling or bending the upper ends of the conductors to embrace and holding the fusible conductor thread is formed, the soft solder is applied to the receptacle and the fusible conductor in this area and the connecting pieces between the fused conductors are separated. Then the fastening area is reground, cleaned and cleaned if necessary, whereupon the cap is placed on the base and fastened.

Die Vorbereitung der Ausformung der Aufnahme am oberen Ende jedes Leiters besteht, je nach der gewünschten Form der Aufnahme, beispielsweise im Ankippen, nämlich in einem geringfügigen Umbiegen des Endes des Leiters, wenn die Aufnahme durch Einrollen hergestellt werden soll. Auch die Flachformung und die Herstellung eines länglichen Ausschnitts in dem Leiter oberhalb des Sockels zählt zu den vorbereitenden Arbeiten, bevor der Schmelzleiterfaden befestigt wird. Wesentlich ist, dass eine Vielzahl von Einheiten aus Sockeln mit eingesetzten Leitern gleichzeitig bearbeitet wird, indem die Sokkel in einer Vorrichtung in einer Reihe ausgerichtet nebeneinander angeordnet werden. Der gleichzeitig über die gesamte Reihe der Leiter verlaufende Schmelzleiterfaden wird in einem Arbeitsgang beim Herstellen der Aufnahme durch Einrollen oder Umbiegen der oberen Enden der Leiter von diesem umfasst und gehalten, so dass im weiteren Arbeitsgang das Aufschmelzen des Lötzinns erfolgen kann, danach das Abtrennen der so gebildeten Schmelzleiter von dem gemeinsamen Faden, worauf die Restarbeiten ausgeführt werden können.The preparation of the shape of the receptacle at the upper end of each conductor, depending on the desired shape of the receptacle, for example in tilting, namely in a slight bending of the end of the conductor if the receptacle is to be produced by curling. The flat forming and the production of an elongated cutout in the conductor above the base are also part of the preparatory work before the fuse element thread is attached. It is essential that a large number of units consisting of bases with inserted conductors are processed simultaneously by arranging the pedestals in a row in an aligned manner side by side. The fusible conductor thread, which runs simultaneously over the entire row of conductors, is encompassed and held by the upper ends of the conductors during the manufacture of the receptacle by rolling or bending the upper ends of the conductor, so that the solder can be melted in the further operation, and then the so separated formed fuse element from the common thread, whereupon the remaining work can be carried out.

Insgesamt wird so ohne erheblichen Mehraufwand eine wesentliche Verbesserung der Qualität der Befestigung des Schmelzleiters an den Leitern der Kleinstsicherung erreicht. Durch eine erhebliche Reduzierung des Ausschussanteils können sich vielmehr Einsparungen ergeben. Sehr wesentlich sind die Vorteile, die sich aufgrund der erfindungsgemässen Ausbildung und der höheren Zuverlässigkeit der Verbindung zwischen Schmelzleiter und Leiter bei der Verwendung der Kleinstsicherung ergeben.All in all, a significant improvement in the quality of the attachment of the fuse element to the conductors of the miniature fuse is achieved without considerable additional effort. A considerable reduction in the reject percentage can result in savings. The advantages that result from the design according to the invention and the higher reliability of the connection between the fuse element and the conductor when using the miniature fuse are very important.

Die Erfindung wird nachfolgend mit Bezug auf die Zeichnung näher erläutert. In den Zeichnungen zeigen:

  • Fig. 1 eine Vorderansicht eines Sockels einer Kleinstsicherung im Fertigungszustand vor dem Einrollen von durch den Sockel hindurchtretenden Leitern;
  • Fig. eine Seitenansicht zu Fig.1 mit Darstellung des nächsten Fertigungsschritts;
  • Fig. 3 eine Vorderansicht des Sockels nach erfolgter Befestigung eines Schmelzleiters an den Leitern;
  • Fig. 4 eine schematische Darstellung einer bei der Herstellung der Kleinstsicherung benutzten Vorrichtung.
The invention is explained in more detail below with reference to the drawing. The drawings show:
  • Figure 1 is a front view of a base of a miniature fuse in the manufacturing state before rolling in of conductors passing through the base.
  • 1 shows a side view of FIG. 1 showing the next manufacturing step;
  • 3 shows a front view of the base after a fuse element has been attached to the conductors;
  • Fig. 4 is a schematic representation of a device used in the manufacture of the miniature fuse.

Ein aus Kunststoff bestehender, im Querschnitt kreisförmiger Sockel 1 ist an seinem Umfang mit Rippen 2 für die Befestigung einer nicht dargestellten Kunststoffkappe sowie mit zwei durch diesen Sockel hindurchtretenden und in diesem verankerten stiftförmigen Leitern 3 versehen, deren zum Anschluss beispielsweise an Leiterplatten dienende Kontaktstifte unterhalb des Sockels 1 vorstehen. Oberhalb des Sockels 1 sind die Leiter 3 flach geformt und weisen, wie dargestellt, längliche Ausschnitte 4 auf. Diese abgeflachten Abschnitte der Leiter 3 werden unter Einbeziehung eines strich-punktierten Schmelzleiters 6 unter Bildung einer den Schmelzleiter 6 umfassenden Aufnahme 5, wie in Fig.2 veranschaulicht, eingerollt, und zwar nach vorherigem Ankippen an der Stelle 7. Danach erfolgt das Aufbringen des Lötzinns 8, darauf das Abtrennen überstehender Schmelzleiterteile, so dass sich schliesslich der Endzustand nach Fig. 3 ergibt.A plastic base, which is circular in cross section, is provided on its circumference with ribs 2 for fastening a plastic cap, not shown, and with two pin-shaped conductors 3 which pass through and are anchored in this base and whose contact pins are used, for example, to connect to circuit boards below the base Protrude base 1. Above the base 1, the conductors 3 are shaped flat and, as shown, have elongate cutouts 4. These flattened sections of the conductors 3 are rolled in with the inclusion of a dash-dotted fuse element 6 to form a receptacle 5 comprising the fuse element 6, as illustrated in FIG. 2, and after prior tilting at position 7. The solder is then applied 8, followed by the separation of protruding fusible conductor parts, so that finally the final state according to FIG. 3 results.

Für eine gemeinsame Bearbeitung einer Vielzahl von Einheiten, bestehend aus Sockel 1 und Leitern 3, werden diese Einheiten, wie schematisch in Fig. 4 dargestellt wird, in eine Vorrichtung 10, die die Form einer Leiste hat, in einer Reihe nebeneinander ausgerichtet eingesetzt. Falls die Abflachung der Leiter 3 bereits vor dem Einsetzen derselben in die Sockel 1 erfolgt ist, beginnt die Bearbeitung in der Vorrichtung 10 mit dem Anlegen eines Schmelzleiterfadens 9 in gestreckter Lage an sämtliche Leiter 3. Nun wird das Einrollen der Leiter 3, die an der Stelle 7 angekippt sind, so durchgeführt, dass der Schmelzleiterfaden 9 anschliessend, wie in Fig. 2 durch Bezeichnung des Schmelzleiters 6 dargestellt, von der gebildeten Aufnahme 5 erfasst bzw. umfasst ist. Nach dem Aufbringen des aus Zinn bestehenden Weichlots auf den gesamten Verbindungsbereich zwischen Aufnahme 5 und Schmelzleiterfaden 9 werden davon die einzelnen Schmelzleiter 6 abgeteilt, nämlich von dem gemeinsamen Faden abgeschnitten, und an den Verbindungsstellen werden gegebenenfalls notwendige Restarbeiten ausgeführt, worauf die nicht dargestellte Kappe auf den Sockel 1 aufgesetzt und mit diesem fest verbunden wird.For a joint processing of a multiplicity of units, consisting of base 1 and conductors 3, these units, as shown schematically in FIG. 4, are inserted in a device 10, which is in the form of a strip, aligned in a row next to one another. If the flattening of the conductors 3 has already taken place before they are inserted into the base 1, the processing in the device 10 begins with the application of a fusible conductor thread 9 in an extended position to all conductors 3. Now the conductor 3, which is attached to the Position 7 are tilted so that the fusible conductor thread 9 is subsequently captured or encompassed by the receptacle 5 formed, as shown in FIG. 2 by the designation of the fusible conductor 6. After applying the solder made of tin to the entire connection area between the receptacle 5 and fusible conductor thread 9, the individual fusible conductors 6 are separated therefrom, namely cut off from the common thread, and any necessary remaining work is carried out at the connection points, whereupon the cap (not shown) is placed on the Socket 1 is placed and firmly connected to it.

Abschliessend sei zur Veranschaulichung der geringen Baugrösse der Kleinstsicherung auf deren ungefähre Abmessungen hingewiesen:

  • Sockeldurchmesser ca. 7 mm
  • Leiterdurchmesser ca. 0,6 mm
  • Breite der abgeflachten Leiter ca. 1,2 mm
  • Leiterlänge oberhalb des Sockels vor dem Einrollen ca. 4,5 mm
  • Innendurchmesser der Aufnahme ca. 1 mm.
Finally, to illustrate the small size of the miniature fuse, we would like to point out its approximate dimensions:
  • Base diameter approx. 7 mm
  • Conductor diameter approx. 0.6 mm
  • Width of the flattened conductors approx. 1.2 mm
  • Conductor length above the base approx. 4.5 mm before rolling in
  • Inner diameter of the holder approx. 1 mm.

Es versteht sich von selbst, dass sich vorstehende Abmessungen lediglich auf ein einziges Ausführungsbeispiel beziehen und die Erfindung hierauf keinesfalls beschränkt werden soll.It goes without saying that the above dimensions relate only to a single exemplary embodiment and the invention should in no way be limited to these.

Es wird noch darauf hingewiesen, dass die gleiche Grösse der ösenförmigen Aufnahme 5 für Schmelzleiter verschiedener Durchmesser verwendet werden kann. Denn den Zwischenraum zwischen dem Schmelzleiter und der Aufnahme 5 füllt in jedem Falle das Lötzinn 8 aus, von dem jeweils so viel in die Aufnahme 5 fliesst, wie gebraucht wird, um den Zwischenraum auszufüllen. Bei der Befestigung sehr dünner Schmelzleiter 6 ergibt sich sogar durch den grösseren Zwischenraum zwischen diesem und der Aufnahme 5 eine noch grössere Kapillarwirkung, d. h. das Lötzinn 8 wird in die ösenförmige Aufnahme 5 gezogen. Die Aufnahme 5 bildet einen natürlichen Schutz der Lötverbindung gegen jegliche Art der Beeinträchtigung der Befestigung, auch gegenüber direkter mechanischer Einwirkung, vor allem auch im weiteren Fertigungsverlauf.It is also pointed out that the same size of the eyelet-shaped receptacle 5 for Fusible conductors of different diameters can be used. This is because the gap between the fuse element and the receptacle 5 fills the solder 8 in each case, of which as much flows into the receptacle 5 as is needed to fill the gap. When attaching very thin fuse element 6, an even greater capillary effect results from the larger space between it and the receptacle 5, ie the solder 8 is drawn into the eyelet-shaped receptacle 5. The receptacle 5 forms a natural protection of the soldered connection against any kind of impairment of the fastening, also against direct mechanical action, especially also in the further course of the production.

Claims (4)

1. Miniature fuse consisting of a plastics base (1), a plastics cap and two conductors (3) which pass through the base (1) and which are bridged within the cap by a fusing conductor (6) soldered onto the conductors (3), a mounting (5) for the fusing conductor (6) being formed on each conductor (3) above the base (1) and the connection between the mounting (5) and the fusing conductor (6) being secured by melting on soft solder (8), characterized in that the mounting (5) is formed by rolling in or bending over of the upper end of the conductor (3) in the form of an eye for enclosing and holding the fusing conductor (6).
2. Miniature fuse according to Claim 1, characterized in that the upper end of the conductor (3) is of flat shape and recesses (4) or jogs are provided in the region of the mounting (5).
3. Miniature fuse according to Claims 1 and 2, characterized in that an oblong aperture (4) is formed at the top flat-shaped end of the conductor (3).
4. Method of producing a miniature fuse according to one or more of Claims 1 to 3, characterized in that a plurality of bases (1) with inserted conductors (3), at the upper ends of which the mounting is prepared, are arranged adjacent to one another aligned in a row, a continuous fusing conductor filament (9) is laid against said conductors in elongated position and at a given height transversely across the upper ends of the conductors, the mounting (5) is formed by rolling in or bending over the upper ends of the conductors for enclosing and holding the fusing conductor filament (9), the soft solder (8) is applied to the mounting (5) and the fusing conductor (6) in this region and the connecting pieces between the fusing conductors (6) formed are severed.
EP85101136A 1984-03-10 1985-02-04 Miniature fuse and method of fabrication therefor Expired EP0154801B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85101136T ATE42866T1 (en) 1984-03-10 1985-02-04 MINIATURE FUSE AND METHOD OF MANUFACTURE THEREOF.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3408854 1984-03-10
DE19843408854 DE3408854A1 (en) 1984-03-10 1984-03-10 LOW FUSE AND MANUFACTURING METHOD HERE

Publications (3)

Publication Number Publication Date
EP0154801A2 EP0154801A2 (en) 1985-09-18
EP0154801A3 EP0154801A3 (en) 1986-04-02
EP0154801B1 true EP0154801B1 (en) 1989-05-03

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Application Number Title Priority Date Filing Date
EP85101136A Expired EP0154801B1 (en) 1984-03-10 1985-02-04 Miniature fuse and method of fabrication therefor

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Country Link
US (1) US4628293A (en)
EP (1) EP0154801B1 (en)
JP (1) JPS60258824A (en)
AT (1) ATE42866T1 (en)
DE (2) DE3408854A1 (en)

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JPH0720828Y2 (en) * 1989-06-14 1995-05-15 エス・オー・シー株式会社 Ultra-small current fuse
DE9015208U1 (en) * 1990-11-05 1991-01-17 Wickmann-Werke Gmbh, 5810 Witten, De
US5287079A (en) * 1992-11-09 1994-02-15 Cooper Industries, Inc. Sub-miniature plastic fuse
DE19803605B4 (en) * 1998-01-30 2004-08-26 Wickmann-Werke Gmbh Process for manufacturing electrical fuses
US6462472B1 (en) * 2000-04-12 2002-10-08 Chen Hsien Huang Fixing structure for safety fuse of Christmas lamp
CN101484962A (en) * 2006-06-16 2009-07-15 斯玛特电子公司 Small-sized surface-mounted fuse and method of manufacturing the same
US20080143471A1 (en) * 2006-12-15 2008-06-19 Chun-Chang Yen Fuse assembly
US20090108980A1 (en) * 2007-10-09 2009-04-30 Littelfuse, Inc. Fuse providing overcurrent and thermal protection
US8576041B2 (en) * 2008-12-17 2013-11-05 Cooper Technologies Company Radial fuse base and assembly
KR101038401B1 (en) * 2009-04-21 2011-06-03 스마트전자 주식회사 A small fuse and the manufacturing method of it
DE102009019059A1 (en) * 2009-04-27 2010-11-04 Chun-Chang Yen Base for fuse, has wire which is inserted for connection pin in vending machine, where connection pin is cut into sections and bulge is attached to connection pin

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US3123696A (en) * 1964-03-03 Cffalq l
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FR762124A (en) * 1932-11-15 1934-04-04 Molded insulating material circuit breaker bar with partition to prevent the propagation of the electric arc
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Also Published As

Publication number Publication date
JPH0542767B2 (en) 1993-06-29
ATE42866T1 (en) 1989-05-15
DE3408854A1 (en) 1985-09-12
US4628293A (en) 1986-12-09
EP0154801A3 (en) 1986-04-02
DE3570011D1 (en) 1989-06-08
JPS60258824A (en) 1985-12-20
EP0154801A2 (en) 1985-09-18

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