EP0275517A2 - Overload snap circuit-breaking switch for domestic apparatuses - Google Patents

Overload snap circuit-breaking switch for domestic apparatuses Download PDF

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Publication number
EP0275517A2
EP0275517A2 EP87118881A EP87118881A EP0275517A2 EP 0275517 A2 EP0275517 A2 EP 0275517A2 EP 87118881 A EP87118881 A EP 87118881A EP 87118881 A EP87118881 A EP 87118881A EP 0275517 A2 EP0275517 A2 EP 0275517A2
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EP
European Patent Office
Prior art keywords
contact
overcurrent protection
switch according
protection snap
snap switch
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.)
Granted
Application number
EP87118881A
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German (de)
French (fr)
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EP0275517A3 (en
EP0275517B1 (en
Inventor
Rolf Pirdzuns
Wolfgang Dr. Polligkeit
Michael Dr. Schluckebier
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Vorwerk and Co Interholding GmbH
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Vorwerk and Co Interholding GmbH
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Priority to AT87118881T priority Critical patent/ATE83337T1/en
Publication of EP0275517A2 publication Critical patent/EP0275517A2/en
Publication of EP0275517A3 publication Critical patent/EP0275517A3/en
Application granted granted Critical
Publication of EP0275517B1 publication Critical patent/EP0275517B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/04—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrothermal opening

Definitions

  • the invention relates to an overcurrent protection snap-action switch for household appliances, in particular floor care devices, with one-sided fixed contact, which at the same time contains the power connection and with an interrupter contact part on the other hand, the contact system also being designed as a power connection and the contact spring being held in one of two end positions by means of a metal center strip , by the metal central strip being subjected to tension, is designed as a resistance element and the metal edge strips are prestressed, so that when the resistance element is cold, the contacts engage and when the resistance element heats up due to current flow, the contacts snap into a de-energized position with separation and the original element cools down after the resistance element has cooled Contact position can be restored by means of an externally actuated reset button.
  • overcurrent protection snap switches have the purpose of suddenly protecting household appliances, in particular floor care devices, from overcurrent damage when the electric motor is blocked, by automatically interrupting the power supply immediately and restoring the normal operating state only after manual reset.
  • Such overcurrent protection snap-action switches are known from DE-PS 1 513 242.
  • This document describes such a switch of the type mentioned at the outset, in which two movable contact arms are arranged in parallel, the ends of which are on the one hand in a two-part receptacle and which are free floating opposite side carries a contact.
  • the thin center tongue is electrically conductive at a connection point, but is only positively fixed.
  • the contact side transmits via spring contact via a contact the electrical energy to the second connection point.
  • the thin center tongue forms an electrical resistance element which expands in accordance with the value exceeding the nominal current and can snap the free contact from its first end position into the de-energized position with the contact pieces separated.
  • the reset is carried out by means of a reset that can be operated manually from the outside.
  • the invention has for its object to provide an overcurrent protection snap-action switch of the type mentioned, which, while avoiding the aforementioned shortcomings, grants a safe, long-lasting switching duration in the devices mentioned above, the arc occurring only being conducted to the designated locations and the mechanical stress on the thin central tongue is reduced.
  • the contact spring (1) finds its position in the adjustable contact receptacle (14), which consists of the contact bottom (14a) and the contact top (14b). Between the two there is a split prism hole (15) in the rear area Adjusting mandrels (16) of different diameters are introduced in order to keep the contact area (27) constant.
  • Fig. 2 the front view of the contacting underside (14a) is shown.
  • the U-shaped outer webs (2a, 2b) of the contact spring (1) are inserted into the receptacles (13a, 13b) flattened on one side and held in a form-fitting manner.
  • the thin center tongue (3) then lies in the V-shaped notch (28) and is hung behind the upper part of the connection pole (24) in the contact area (27) with the retaining web (2a), so that the contact spring (1) is mechanically defined is held in the adjustable contact receptacle (14) and is connected in an electrically conductive manner to the connection pole (24).
  • the contact spring (1) On the opposite side, the contact spring (1) is kept free and carries on its contact support surface (6) the contact (7), with its contact support surface (6 ⁇ ), which in its working end position lies against the front area (10) of the contact tongue (9) and so on guarantees the current flow to the connection pole (25).
  • an overcurrent protection switch (19) according to the invention is shown, in which the contact spring (1), the adjustable contact (14) and the fixed contact side (9) with the associated mating contact (7) are installed on the inside.
  • the contact (14) is supported against a base (20) and carries a return spring (21) for the reset button (22) in the abutment area (20a).
  • This reset button (22) is recessed in the area of the thin center tongue (3) so that its longer side webs (23) come into contact with the U-shaped outer webs (2a, 2b) of the contact spring (1) when the button (22) is pressed reach.
  • the outer webs (2a, 2b) are pressed down, whereas the thin central web (3) is held in the contact (14).
  • the outer webs (2a, 2b) snap through and the contact (7) closes with the fixed contact tongue (9), so that an electrical contact is established between the connection poles (24 and 25).
  • the contact spring (1) increases as a result of a fault in the consumer (not shown here)
  • the thin central tongue (3) heats up due to resistance and expands out.
  • the contact spring (1) snaps back into the previous state and separates the contacts (9) and (7) from one another.
  • the molding (4) in the U-bottom (5) of the outer webs (2a, 2b) is subjected to bending.
  • the contact support surface (6) of the contact (7) is designed in the shape of a spherical segment and the front area (10) of the contact tongue (9) is surrounded by an insulating piece (11) molded integrally on the switch housing (12). This ensures that the arc (18) cannot move in the direction of the thin center tongue (3).
  • a field of a spark guide magnet 17, 17 'in the form of a permanent magnet is introduced, which runs as shown in FIGS. 4 and 5.
  • the spark guide magnets (17, 17 ⁇ ) can, however, also be designed as electromagnets which are connected to the circuit in such a way that the field and current direction run in the same direction.

Abstract

The invention is directed to an overcurrent-protective switch for household appliances such as a vacuum cleaner. The snap switch has a housing in which a contact mounting unit is mounted at one end of the housing and contains one of two current terminals of the switch. The other current terminal is mounted at the other end of the housing and is configured to define a contact-engaging surface. A resilient interrupting contact member is fixedly connected to the one current terminal and has a metal center strip by means of which it is held in one of two end positions. In the first end position, the contact member is held in contact engagement with the contact-engaging surface of the other current contact terminal and, in the second end position, it is disengaged from the contact-engaging surface. When the center resistance strip is cool, the contact member is in its first position and the current circuit between the two current terminals is closed. On the other hand, when excessive current passes through the center strip, the latter heats and expands causing the contact member to snap over into the second position to interrupt the current circuit between the two current terminals. A reset plunger returns the contact member to its first position.

Description

Die Erfindung betrifft einen Überstromschutz-Schnappschalter für Haushaltsgeräte, insbesondere Bodenpflegegeräte, mit einseitig fixierter Kontaktaufnahme, die gleichzeitig den Stromanschluß beinhaltet und mit einem Unterbrecherkontaktteil andererseits, wobei die Kontaktanlage ebenfalls als Stromanschluß ausgebildet ist und die Kontaktfeder mittels eines Metallmittelstreifens in einer von zwei Endlagen gehalten ist, indem der Metallmittelstreifen auf Zug beansprucht, als ein Widerstandselement ausgebildet ist und die Metallrandstreifen vorgespannt sind, so daß bei kaltem Widerstandselement die Kontakte in Anlage und bei stromdurchflußbedingter Erwärmung des Widerstandselements die Kontakte unter Trennung in eine stromlose Lage umschnappen und nach Erkalten des Widerstandselements die ursprüngliche Kontaktlage mittels eines von außen betätigbaren Resetiertasters wieder herstellbar ist.The invention relates to an overcurrent protection snap-action switch for household appliances, in particular floor care devices, with one-sided fixed contact, which at the same time contains the power connection and with an interrupter contact part on the other hand, the contact system also being designed as a power connection and the contact spring being held in one of two end positions by means of a metal center strip , by the metal central strip being subjected to tension, is designed as a resistance element and the metal edge strips are prestressed, so that when the resistance element is cold, the contacts engage and when the resistance element heats up due to current flow, the contacts snap into a de-energized position with separation and the original element cools down after the resistance element has cooled Contact position can be restored by means of an externally actuated reset button.

Derartige Überstromschutz-Schnappschalter haben den Zweck, Haushaltsgeräte, insbesondere Bodenpflegegeräte, vor Überstromschäden bei blockiertem Elektromotor schlagartig zu schützen, indem sie die Stromzufuhr sofort automatisch unterbrechen und erst nach manueller Resetierung den normalen Betriebszustand wieder herstellen.Such overcurrent protection snap switches have the purpose of suddenly protecting household appliances, in particular floor care devices, from overcurrent damage when the electric motor is blocked, by automatically interrupting the power supply immediately and restoring the normal operating state only after manual reset.

Bekannt sind derartige Überstromschutz-Schnappschalter aus der DE-PS 1 513 242. Diese Schrift beschreibt einen solchen Schalter der eingangs genannten Art, in welchem sich zwei bewegliche Kontaktarme in paralleler Anordnung befinden, wobei sich die Enden einerseits in einer zweigeteilten Aufnahme befinden und die frei schwebende Gegenseite einen Kontakt trägt. Hierbei ist die dünne Mittelzunge an einem Anschlußpunkt elektrisch leitend, jedoch nur formschlüssig festgelegt. Die Kontaktseite überträgt mittels Federdruck über einen Kontakt die elektrische Energie auf den zweiten Anschlußpunkt. Hierbei bildet die dünne Mittelzunge ein elektrisches Widerstandselement, welches sich, entsprechend des den Nennstrom überschreitenden Werts, ausdehnt und den freien Kontakt aus seiner ersten Endlage unter Trennung der Kontaktstücke in die stromlose Lage einschnappen läßt. Die Rückstellung erfolgt mittels eines von außen manuell betätigbaren Rückstellers.Such overcurrent protection snap-action switches are known from DE-PS 1 513 242. This document describes such a switch of the type mentioned at the outset, in which two movable contact arms are arranged in parallel, the ends of which are on the one hand in a two-part receptacle and which are free floating opposite side carries a contact. Here, the thin center tongue is electrically conductive at a connection point, but is only positively fixed. The contact side transmits via spring contact via a contact the electrical energy to the second connection point. Here, the thin center tongue forms an electrical resistance element which expands in accordance with the value exceeding the nominal current and can snap the free contact from its first end position into the de-energized position with the contact pieces separated. The reset is carried out by means of a reset that can be operated manually from the outside.

Eine derartige Lösung hat jedoch den Nachteil, daß bei Einsatz eines solchen Überstromschutz-Schnappschalters in einem Bodenpflegegerät, die dünne Mittelzunge häufig elektrisch und mechanisch zerstört wird, da das normale Einsatzgebiet derartiger Sicherheitseinrichtungen im Hi-fi bzw. im Elektronikbereich liegt. Geht man davon aus, daß ein Bodenpflegegerät nach statistischem Durchschnitt einmal pro Woche durch eingesaugte Gegenstände oder Teppichfransen vollständig blockiert wird und eine Strombelastung von ca. 2,5 A bei 220 V vorliegt, kommt man zu ca. 52 Schaltungen pro Jahr. Bedingt durch die notwendige dünne Mittelzunge, die die Schnappschaltung der Kontakte herbeiführt und die elektrische Belastung springt beim Schaltvorgang der Schaltlichtbogen nicht immer sicher auf die dafür vorgesehenen Kontakte, sondern teilweise auf den vorderen Bereich der dünnen Mittelzunge, die sodann "durchgeschweißt" wird. Zumindest jedoch so stark beschädigt wird, daß beim nächsten "normalen" Schaltvorgang der dünne Mittelsteg an dieser Stelle mechanisch bricht.However, such a solution has the disadvantage that when such an overcurrent protection snap-in switch is used in a floor care device, the thin center tongue is often electrically and mechanically destroyed, since the normal area of use of such safety devices is in hi-fi or electronics. If one assumes that a floor care device is blocked once a week by objects or carpet fringes and that there is a current load of approx. 2.5 A at 220 V, this leads to approx. 52 switching operations per year. Due to the necessary thin center tongue, which brings about the snap switching of the contacts and the electrical load does not always jump securely onto the contacts provided for this during the switching process of the switching arc, but partly on the front area of the thin center tongue, which is then "welded through". At least, however, it is so badly damaged that the thin central web breaks mechanically at this point during the next "normal" switching operation.

Die Erfindung hat nun zur Aufgabe, einen Überstromschutz-­Schnappschalter der eingangs genannten Art zu schaffen, der, unter Vermeidung der vorgenannten Mängel, eine sichere, langlebige Schaltdauer in den vorbezeichneten Geräten gewährt, wobei der auftretende Lichtbogen nur zu den dafür vorgesehenen Stellen geleitet und die mechanische Belastung der dünnen Mittelzunge verringert wird.The invention has for its object to provide an overcurrent protection snap-action switch of the type mentioned, which, while avoiding the aforementioned shortcomings, grants a safe, long-lasting switching duration in the devices mentioned above, the arc occurring only being conducted to the designated locations and the mechanical stress on the thin central tongue is reduced.

Diese Aufgabe wird entsprechend des kennzeichnenden Teils des Anspruchs 1 gelöst. In den daran anschließenden Unteransprüchen sind vorteilhafte Ausgestaltungen der Erfindung beschrieben.This object is achieved in accordance with the characterizing part of claim 1. Advantageous embodiments of the invention are described in the subsequent subclaims.

Nachfolgend soll anhand der Zeichnungen ein erfindungsgemäßes Beispiel dargestellt und näher beschrieben werden.An example according to the invention is to be illustrated and described in more detail below with reference to the drawings.

Es zeigen:

  • Fig. 1: eine schematische Darstellung eines erfindungsgemäßen Schalters mit allen zugehörigen Einbauteilen im Schnitt,
  • Fig. 2: die Vorderansicht des Kontaktaufnahmeunterteils, in dem die einseitig abgeflachten Aufnahmen dargestellt sind,
  • Fig. 3: eine Draufsicht auf das Schnappelement mit Kontakt, U-förmigen Außenstegen und der dünnen Mittelzunge,
  • Fig. 4: eine schematische Darstellung der Kontaktanordnung mit zerstörerischem Schaltfunken, der von der Magnetanordnung vom vorderseitigen Kontaktbereich zum Kontakt hin geleitet ist.
  • Fig. 5: eine schematische Darstellung der Kontaktanordnung mit dem Schaltfunken, der von der Magnetanordnung vom Kontakt zum vorderseitigen Kontaktbereich geleitet ist.
Show it:
  • 1: a schematic representation of a switch according to the invention with all associated installation parts in section,
  • 2: the front view of the lower contact part, in which the flattened receptacles are shown,
  • 3: a top view of the snap element with contact, U-shaped outer webs and the thin central tongue,
  • Fig. 4: a schematic representation of the contact arrangement with destructive switching sparks, which is guided by the magnet arrangement from the front contact area to the contact.
  • 5: shows a schematic representation of the contact arrangement with the switching spark which is conducted from the magnet arrangement from the contact to the front-side contact area.

Nach Fig. 1 findet die Kontaktfeder (1) ihre Lage in der justierbaren Kontakt-Aufnahme (14), die aus der Kontaktaufnahme-Unterseite (14a) und der Kontaktaufnahme-­Oberseite (14b) besteht. Zwischen beiden befindet sich im hinteren Bereich ein geteiltes Prismenloch (15), in welches Justierdorne (16) verschiedenen Durchmessers eingebracht werden, um den Kontaktbereich (27) konstant zu halten. In Fig. 2 ist die Vorderansicht der Kontaktaufnahme-Unterseite (14a) dargestellt. In die einseitig abgeflachten Aufnahmen (13a,13b) werden die U-förmigen Außenstege (2a,2b) der Kontaktfeder (1) eingesteckt und formschlüssig gehalten. Die dünne Mittelzunge (3) liegt dann in der V-förmigen Kerbe (28) und wird hinter dem oberen Teil des Anschlußpols (24) im Kontaktbereich (27) mit dem Haltesteg (2a) eingehängt, so daß die Kontaktfeder (1) mechanisch definiert in der justierbaren Kontakt-Aufnahme (14) gehalten und elektrisch leitend mit dem Anschlußpol (24) verbunden ist. Auf der Gegenseite ist die Kontaktfeder (1) freigehalten und trägt auf ihrer Kontaktauflagefläche (6) den Kontakt (7), mit dessen Kontaktauflageoberfläche (6ʹ), der in seiner Arbeitsendlage gegen den vorderseitigen Bereich (10) der Kontaktzunge (9) anliegt und so den Stromfluß zum Anschlußpol (25) garantiert.According to Fig. 1, the contact spring (1) finds its position in the adjustable contact receptacle (14), which consists of the contact bottom (14a) and the contact top (14b). Between the two there is a split prism hole (15) in the rear area Adjusting mandrels (16) of different diameters are introduced in order to keep the contact area (27) constant. In Fig. 2 the front view of the contacting underside (14a) is shown. The U-shaped outer webs (2a, 2b) of the contact spring (1) are inserted into the receptacles (13a, 13b) flattened on one side and held in a form-fitting manner. The thin center tongue (3) then lies in the V-shaped notch (28) and is hung behind the upper part of the connection pole (24) in the contact area (27) with the retaining web (2a), so that the contact spring (1) is mechanically defined is held in the adjustable contact receptacle (14) and is connected in an electrically conductive manner to the connection pole (24). On the opposite side, the contact spring (1) is kept free and carries on its contact support surface (6) the contact (7), with its contact support surface (6ʹ), which in its working end position lies against the front area (10) of the contact tongue (9) and so on guarantees the current flow to the connection pole (25).

In den Fig. 1 bis 3 ist ein erfindungsgemäßer Überstromschutz-­Schalter (19) dargestellt, in den innenseitig die Kontaktfeder (1), die justierbare Kontaktaufnahme (14) sowie die feststehende Kontaktseite (9) mit dem zugehörigen Gegenkontakt (7) eingebaut sind. Die Kontaktaufnahme (14) stützt sich gegen einen Sockel (20) und trägt im Stoßflächenbereich (20a) eine Rückstellfeder (21) für den Resetiertaster (22). Dieser Resetiertaster (22) ist im Bereich der dünnen Mittelzunge (3) ausgespart, so daß seine längeren Seitenstege (23) bei Druck auf den Taster (22) mit den U-förmigen Außenstegen (2a,2b) der Kontaktfeder (1) in Berührung gelangen. Hierdurch werden die Außenstege (2a,2b) nach unten gedrückt, wohingegen der dünne Mittelsteg (3) in der Kontaktaufnahme (14) festgehalten ist. Bei entsprechendem Druckweg schnappen die Außenstege (2a,2b) durch und der Kontakt (7) schließt sich mit der festen Kontaktzunge (9), so daß ein elektrischer Kontakt zwischen den Anschlußpolen (24 und 25) hergestellt ist. Erhöht sich nun der Stromfluß durch die Kontaktfeder (1) infolge einer Störung am - ­hier nicht dargestellten - Verbraucher, so erwärmt sich widerstandsbedingt die dünne Mittelzunge (3) und dehnt sich aus. Infolge der Rückfederkraft der Außenstege (2a,2b) schnappt die Kontaktfeder (1) wieder in den vorherigen Zustand und trennt die Kontakte (9) und (7) voneinander. Hierbei wird, wie ersichtlich, die Anformung (4) im U-Boden (5) der Außenstege (2a,2b) auf Biegung beansprucht. Gleichzeitig kann - bei Fehlen der erfindungsgemäßen Merkmale - im vorderseitigen Bereich (10) der Kontaktzunge (9) bedingt durch die Ausbildung des auftretenden elektrischen Feldes E der Lichtbogen (18) auf die dünne Mittelzunge (3) unkontrolliert überspringen - dargestellt in den Fig. 4 und 5 -. Um dieses zu vermeiden, ist die Kontaktauflagefläche (6) des Kontakts (7) kugelsegmentförmig gestaltet und der vordere Bereich (10) der Kontaktzunge (9) von einem, am Schaltergehäuse (12) materialeinheitlich angeformten Isolierstück (11) umfaßt. Hierdurch wird erzielt, daß der Lichtbogen (18) sich nicht in Richtung der dünnen Mittelzunge (3) hin bewegen kann.1 to 3, an overcurrent protection switch (19) according to the invention is shown, in which the contact spring (1), the adjustable contact (14) and the fixed contact side (9) with the associated mating contact (7) are installed on the inside. The contact (14) is supported against a base (20) and carries a return spring (21) for the reset button (22) in the abutment area (20a). This reset button (22) is recessed in the area of the thin center tongue (3) so that its longer side webs (23) come into contact with the U-shaped outer webs (2a, 2b) of the contact spring (1) when the button (22) is pressed reach. As a result, the outer webs (2a, 2b) are pressed down, whereas the thin central web (3) is held in the contact (14). With a corresponding pressure path, the outer webs (2a, 2b) snap through and the contact (7) closes with the fixed contact tongue (9), so that an electrical contact is established between the connection poles (24 and 25). If the current flow through the contact spring (1) increases as a result of a fault in the consumer (not shown here), the thin central tongue (3) heats up due to resistance and expands out. As a result of the resilience of the outer webs (2a, 2b), the contact spring (1) snaps back into the previous state and separates the contacts (9) and (7) from one another. As can be seen, the molding (4) in the U-bottom (5) of the outer webs (2a, 2b) is subjected to bending. At the same time - in the absence of the features according to the invention - in the front area (10) of the contact tongue (9), due to the formation of the electric field E occurring, the arc (18) can jump over the thin central tongue (3) in an uncontrolled manner - shown in FIG and 5 -. In order to avoid this, the contact support surface (6) of the contact (7) is designed in the shape of a spherical segment and the front area (10) of the contact tongue (9) is surrounded by an insulating piece (11) molded integrally on the switch housing (12). This ensures that the arc (18) cannot move in the direction of the thin center tongue (3).

Nach den Fig. 4 und 5 wird diese Maßnahme durch die Funkenleitmagnete (17,17ʺ) unterstützt. Durch die Anwesenheit eines Magnetfeldes B wirkt zusätzlich noch die Lorentz-Kraft auf die bewegten Elektronen nach der Gleichung

Figure imgb0001
= e -e (
Figure imgb0002
+
Figure imgb0003
×
Figure imgb0004
).
Je stärker das Magnetfeld B ist, desto stärker werden die Elektronen von V (bzw. E) abgelenkt. Um dem Lichtbogenüberschlag vorzubeugen bzw. ihn zu vermeiden, wird ein Feld eines Funkenleitmagneten 17,17ʺ in Form eines Permanentmagneten eingebracht, welches wie in Fig. 4 und 5 dargestellt verläuft. Die Funkenleitmagnete (17,17ʺ) können jedoch auch als Elektromagnete ausgebildet ssein, welche mit dem Stromkreis so geschaltet sind, daß Feld und Stromrichtung in gleicher Richtung verlaufen.4 and 5, this measure is supported by the spark guide magnets (17, 17ʺ). Due to the presence of a magnetic field B, the Lorentz force also acts on the moving electrons according to the equation
Figure imgb0001
= e -e (
Figure imgb0002
+
Figure imgb0003
×
Figure imgb0004
).
The stronger the magnetic field B is, the more the electrons are deflected by V (or E). In order to prevent arcing or to avoid arcing, a field of a spark guide magnet 17, 17 'in the form of a permanent magnet is introduced, which runs as shown in FIGS. 4 and 5. The spark guide magnets (17, 17ʺ) can, however, also be designed as electromagnets which are connected to the circuit in such a way that the field and current direction run in the same direction.

Claims (12)

1) Überstromschutz-Schnappschalter für Haushaltsgeräte, insbesondere Bodenpflegegeräte, mit einseitig fixierter Kontaktaufnahme, die gleichzeitig den Stromanschluß beinhaltet und mit einem Unterbrecherkontaktteil andererseits, wobei die Kontaktanlage ebenfalls als Stromanschluß ausgebildet ist und die Kontaktfeder mittels eines Metallmittelstreifens in einer von zwei Endlagen gehalten ist, indem der Metallmittelstreifen auf Zug beansprucht, als ein Widerstandselement ausgebildet ist und die Metallrandstreifen vorgespannt sind, so daß bei kaltem Widerstandselement die Kontakte in Anlage und bei stromdurchflußbedingter Erwärmung des Widerstandselements die Kontakte unter Trennung in eine stromlose Lage umschnappen und nach Erkalten des Widerstandslements die ursprüngliche Kontaktlage mittels eines von außen betätigbaren Resetiertasters wieder herstellbar ist, dadurch gekennzeichnet, daß die Kontaktfeder (1) aus U-förmigen Außenstegen (2a,2b) und einer dünnen Mittelzunge (3) besteht, wobei der Übergang von den U-förmigen Außenstegen (2a,2b) zur dünnen Mittelzunge (3) über asymmetrische Radien (R1,R2) erfolgt, so daß der Übergang im Bereich der Anformung (4) der Mittelzunge (3) am U-Boden (5) in Walzrichtung des Metalls konisch ausgebildet ist und die Kontaktauflagefläche (6) des Kontakts (7) vergrößert ist und daß im letztgenannten Bereich Funkenleitmagnete (17,17ʺ) angeordnet sind.1) Overcurrent protection snap switch for household appliances, in particular floor care devices, with one-sided fixed contact, which simultaneously contains the power connection and with an interrupter contact part on the other hand, the contact system also being designed as a power connection and the contact spring being held in one of two end positions by means of a metal center strip by the metal center strip is subjected to tension, is designed as a resistance element and the metal edge strips are prestressed, so that when the resistance element is cold, the contacts engage and when the resistance element heats up due to current flow, the contacts snap into a de-energized position, and after cooling the resistance element, the original contact position by means of an externally actuated reset button can be restored, characterized in that the contact spring (1) consists of U-shaped outer webs (2a, 2b) and a thin central tongue (3), wobe i the transition from the U-shaped outer webs (2a, 2b) to the thin central tongue (3) takes place via asymmetrical radii (R1, R2), so that the transition in the area of the molding (4) of the central tongue (3) on the U-floor (5) is conical in the rolling direction of the metal and the contact contact surface (6) of the contact (7) is enlarged and that spark guiding magnets (17, 17ʺ) are arranged in the latter area. 2) Überstromschutz-Schnappschalter nach Anspruch 1, dadurch gekennzeichnet, daß die Radien (R1,R2) sich von den Außenstegen (2a,2b) von 0,5 auf 2 mm verlaufend zur Mittelzunge (3) hin erstrecken.2) Overcurrent protection snap switch according to claim 1, characterized in that the radii (R1, R2) extend from the outer webs (2a, 2b) from 0.5 to 2 mm to the central tongue (3). 3) Überstromschutz-Schnappschalter nach Anspruch 1, dadurch gekennzeichnet, daß die Außenstege (2a,2b) auf ihrer, dem Kontakt (7) abgewandten Seite, in einseitig abgeflachten Aufnahmen (13a,13b) einer Kontaktaufnahme (14) gehalten sind.3) Overcurrent protection snap-action switch according to claim 1, characterized in that the outer webs (2a, 2b) on their side facing away from the contact (7) are held in receptacles (13a, 13b) flattened on one side of a contact (14). 4) Überstromschutz-Schnappschalter nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß die Kontaktaufnahme (14), die aus einer Kontaktaufnahme-Unterseite (14a) und aus einer Kontaktaufnahme-Oberseite (14b) besteht, mittels eines Prismenloches (15) und darin einbringbaren Justierdornen (16) gestaltet ist.4) Overcurrent protection snap switch according to claim 1 to 3, characterized in that the contact (14), which consists of a contact-underside (14a) and a contact-making top (14b), by means of a prism hole (15) and insertable therein Adjusting mandrels (16) is designed. 5) Überstromschutz-Schnappschalter nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß die Kontaktauflageoberfläche (6ʹ) des Kontakts (7) kugelabschnittförmig ausgebildet sind.5) overcurrent protection snap switch according to claim 1 to 4, characterized in that the contact support surface (6ʹ) of the contact (7) are spherical section-shaped. 6) Überstromschutz-Schnappschalter nach Anspruch 5, dadurch gekennzeichnet, daß die Kontaktauflageoberfläche (6ʹ) halbkugelförmig gestaltet ist.6) overcurrent protection snap switch according to claim 5, characterized in that the contact support surface (6ʹ) is hemispherical. 7) Überstromschutz-Schnappschalter nach Anspruch 6 dadurch gekennzeichnet, daß der vorderseitige Bereich (10) der Kontaktzunge (9) von einem Isolierstück (11), welches am Schaltergehäuse (12) befestigt ist, umfaßt ist.7) overcurrent protection snap switch according to claim 6, characterized in that the front region (10) of the contact tongue (9) by an insulating piece (11) which is attached to the switch housing (12) is included. 8) Überstromschutz-Schnappschalter nach Anspruch 6 und 7, dadurch gekennzeichnet, daß im Bereich der Kontaktzunge (9) und derem vorderen Bereich (10) sowie der Kontaktauflagefläche (6) des Kontakts (7) lichtbogenbeeinflussende Funkenleitmagnete (17,17ʺ) angeordnet sind.8) overcurrent protection snap switch according to claim 6 and 7, characterized in that in the area of the contact tongue (9) and its front area (10) and the contact support surface (6) of the contact (7) arc-influencing spark guide magnets (17, 17ʺ) are arranged. 9) Überstromschutz-Schnappschalter nach Anspruch 8, dadurch gekennzeichnet, daß die Funkenleitmagnete (17,17ʺ) als Dauermagnete ausgebildet sind.9) overcurrent protection snap switch according to claim 8, characterized in that the spark guide magnets (17, 17ʺ) are designed as permanent magnets. 10) Überstromschutz-Schnappschalter nach Anspruch 8, dadurch gekennzeichnet, daß die Funkenleitmagnete (17,17ʺ) als Elektromagnete ausgebildet sind.10) overcurrent protection snap switch according to claim 8, characterized in that the spark guide magnets (17, 17ʺ) are designed as electromagnets. 11) Überstromschutz-Schnappschalter nach Anspruch 8 bis 10, dadurch gekennzeichnet, daß das von den Funkenleitmagneten (17,17ʺ) ausgehende Magnetfeld (B) parallel zum elektrischen Feld (E) des Lichtbogens (18) angeordnet ist.11) Overcurrent protection snap switch according to claim 8 to 10, characterized in that the magnetic field (B) emanating from the spark guide magnet (17, 17ʺ) is arranged parallel to the electric field (E) of the arc (18). 12) Überstromschutz-Schnappschalter nach Anspruch 11, dadurch gekennzeichnet, daß das von den Funkenleitmagneten (17,17ʺ) ausgehende Magnetfeld (B) senkrecht zum elektrischen Feld (E) des Lichtbogens (18) angeordnet ist.12) Overcurrent protection snap-action switch according to claim 11, characterized in that the magnetic field (B) emanating from the spark guide magnet (17, 17ʺ) is arranged perpendicular to the electric field (E) of the arc (18).
EP87118881A 1987-01-17 1987-12-19 Overload snap circuit-breaking switch for domestic apparatuses Expired - Lifetime EP0275517B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87118881T ATE83337T1 (en) 1987-01-17 1987-12-19 OVERCURRENT PROTECTION SWITCH FOR HOUSEHOLD APPLIANCES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873701275 DE3701275A1 (en) 1987-01-17 1987-01-17 OVERCURRENT PROTECTION SNAP SWITCH FOR HOUSEHOLD APPLIANCES
DE3701275 1987-01-17

Publications (3)

Publication Number Publication Date
EP0275517A2 true EP0275517A2 (en) 1988-07-27
EP0275517A3 EP0275517A3 (en) 1990-01-03
EP0275517B1 EP0275517B1 (en) 1992-12-09

Family

ID=6319009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118881A Expired - Lifetime EP0275517B1 (en) 1987-01-17 1987-12-19 Overload snap circuit-breaking switch for domestic apparatuses

Country Status (6)

Country Link
US (1) US4821009A (en)
EP (1) EP0275517B1 (en)
JP (1) JPS63190223A (en)
AT (1) ATE83337T1 (en)
DE (2) DE3701275A1 (en)
ES (1) ES2037066T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995020234A1 (en) * 1994-01-21 1995-07-27 Littelfuse, Inc. Improved breaker or resettable fuse device
US5451729A (en) * 1993-03-17 1995-09-19 Ellenberger & Poensgen Gmbh Single or multipole circuit breaker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004001781A1 (en) * 2002-06-25 2003-12-31 Gerard Industries Pty Ltd Improved electrical switch
CN102931019B (en) * 2012-10-25 2015-05-20 昌辉汽车电器（黄山）股份公司 Mechanical structure controlling light changing function by utilizing combined switch

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GB1116688A (en) * 1964-12-30 1968-06-12 Nikko Denki Seisakusho Ltd Circuit breaker device
DE1275188B (en) * 1961-02-06 1968-08-14 Tung Sol Ind Inc Hot wire snap switch
GB2073493A (en) * 1980-04-04 1981-10-14 Bk Patent Dev Remotely resettable thermal switch
FR2531266A1 (en) * 1982-07-29 1984-02-03 Hutogepgyar Compressor motor overheating protector for domestic refrigerator
GB2125626A (en) * 1982-08-07 1984-03-07 Terence Henry Taylor Arc interruption in air break switch

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US2913557A (en) * 1956-10-22 1959-11-17 Westinghouse Electric Corp Circuit interrupter
DE2621478B2 (en) * 1976-05-14 1978-03-02 Siemens Ag, 1000 Berlin Und 8000 Muenchen Arc extinguishing device for DC switching devices
FR2491676A1 (en) * 1980-10-03 1982-04-09 Thomson Csf ELECTROMAGNETIC RELAY
DE3337562A1 (en) * 1983-10-15 1985-04-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Extinguishing device for a line-protection circuit breaker

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Publication number Priority date Publication date Assignee Title
DE1275188B (en) * 1961-02-06 1968-08-14 Tung Sol Ind Inc Hot wire snap switch
GB1116688A (en) * 1964-12-30 1968-06-12 Nikko Denki Seisakusho Ltd Circuit breaker device
GB2073493A (en) * 1980-04-04 1981-10-14 Bk Patent Dev Remotely resettable thermal switch
FR2531266A1 (en) * 1982-07-29 1984-02-03 Hutogepgyar Compressor motor overheating protector for domestic refrigerator
GB2125626A (en) * 1982-08-07 1984-03-07 Terence Henry Taylor Arc interruption in air break switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451729A (en) * 1993-03-17 1995-09-19 Ellenberger & Poensgen Gmbh Single or multipole circuit breaker
WO1995020234A1 (en) * 1994-01-21 1995-07-27 Littelfuse, Inc. Improved breaker or resettable fuse device

Also Published As

Publication number Publication date
DE3701275A1 (en) 1988-07-28
DE3783025D1 (en) 1993-01-21
DE3701275C2 (en) 1990-05-31
ATE83337T1 (en) 1992-12-15
US4821009A (en) 1989-04-11
ES2037066T3 (en) 1993-06-16
JPS63190223A (en) 1988-08-05
EP0275517A3 (en) 1990-01-03
EP0275517B1 (en) 1992-12-09

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