EP0647957B1 - Thermal cut out with a trip-free mechanism - Google Patents

Thermal cut out with a trip-free mechanism Download PDF

Info

Publication number
EP0647957B1
EP0647957B1 EP19930810713 EP93810713A EP0647957B1 EP 0647957 B1 EP0647957 B1 EP 0647957B1 EP 19930810713 EP19930810713 EP 19930810713 EP 93810713 A EP93810713 A EP 93810713A EP 0647957 B1 EP0647957 B1 EP 0647957B1
Authority
EP
European Patent Office
Prior art keywords
rocker
base plate
contact portion
temperature limiter
bar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19930810713
Other languages
German (de)
French (fr)
Other versions
EP0647957A1 (en
Inventor
Alfred Reifers
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.)
ETHECO EUROPEAN THERMOSTAT COMPANY
Original Assignee
ETHECO European Thermostat Co
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 ETHECO European Thermostat Co filed Critical ETHECO European Thermostat Co
Priority to EP19930810713 priority Critical patent/EP0647957B1/en
Priority to DE59300293T priority patent/DE59300293D1/en
Publication of EP0647957A1 publication Critical patent/EP0647957A1/en
Application granted granted Critical
Publication of EP0647957B1 publication Critical patent/EP0647957B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2671—Means to detect leaks in the pressure sensitive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means
    • H01H2037/705—Resetting means wherein the switch cannot be closed when the temperature is above a certain value

Definitions

  • the invention relates to a temperature limiter mentioned in the preamble of claim 1.
  • Temperature limiters can be used to monitor heat generation systems and to switch them off in the event of an excessive temperature rise. A temperature limiter remains blocked after it is switched off until it is switched on again manually. A reset button is usually used for this. Temperature limiters are partly with extended safety functions such as an actuation safety device or breakage safety device. The actuation safety device ensures that the system monitored by the temperature limiter cannot be switched on as long as the reset button is pressed.
  • a temperature limiter according to the preamble of claim 1 is known as RAK series 08 from the data sheet CE1P1147 D from Landis & Gyr from April 1989. With this temperature limiter, the actuation safety function is implemented by means of an additional switch which interrupts the current path each time the reset button is pressed.
  • the invention has for its object to realize a temperature limiter with an actuation safety device without additional parts such as switches.
  • Fig. 1 shows a section of a temperature limiter in the operational ON position
  • the switching mechanism is constructed in a manner known per se on the interaction of a drive element 1, a spring clip 2, a tilting system 3 and a correspondingly designed geometric shape of a base plate 4.
  • the spring clip 2 shows the top view of the spring clip 2, which consists of a U-shaped frame 5 and a beam 6, one end of which, for example, via two spring bars 7 resiliently mounted in the arch of the frame 5 and the other end is free.
  • a cam 8 and a spring terminal contact piece 9 are attached at the free end.
  • the frame 5 contains bores 10a and 10b for fastening the spring clip 2 on the base plate 4 (Fig. 1).
  • FIG. 3 shows the top view of a rocker switch 12 which is designed as a rectangular leaf spring 12a with a tongue 12b punched out along the long side.
  • a rocker contact piece 13 On one narrow side of the leaf spring 12a at the fixed end of the tongue 12b there is a rocker contact piece 13 and on the other narrow side of the leaf spring 12a opposite the free end of the tongue 12b there is a rectangular recess 12c. Between this recess 12c and the free end of the tongue 12b, the leaf spring 12a is provided with a V-shaped embossment across the leaf spring 12a, which serves as the drive point 12d of the tilting system 3 (FIG. 1).
  • the tilting system 3 in FIG. 1 consists of a support 11 arranged rigidly on the base plate 4, which has a first and a second cutting edge bearing 11a or 11b, and of the rocker switch 12a, b, d.
  • the rocker switch 12 (FIG. 3) is suspended with its recess 12c in the first cutter bearing 11a and is supported with the free end of the tongue 12b in the second cutter bearing 11b of the carrier 11 in such a way that the leaf spring 12a is under tension.
  • the bistable tilting system 3 thus formed tilts from one stable state to the other stable state when the leaf spring 12a is pressed from one side of the second cutting edge bearing 11b over the support point of the tongue 12b in the second cutting edge bearing 11b.
  • the spring clamp 2 and the support 11 are fastened to the base plate 4 in such a way that in the operational ON position of the temperature limiter, the spring clamp 2 acts on the drive point 12d of the tilting system 3 via the cams 8 and that the spring clamp contact piece 9 and the rocker contact piece 13 have a closed one make electrical contact.
  • the drive element 1 is installed in the base plate 4 in such a way that it can be displaced along a y-axis 14.
  • a sensor system 15 filled with an expansion material determines the position of the drive element 1 on the y-axis 14 as a function of the temperature.
  • the drive element 1 acts approximately in the middle of the beam 6 (FIG.
  • the actuation safety is based on a mechanism in which a reset button 18 acts when actuated via a first element on the bar 6 with the spring terminal contact piece 9 and via a second element on the switching rocker 12 with the rocker contact piece 13 in such a way that between the rocker contact piece 13 and the spring terminal contact piece 9 a distance arises and the electrical contact between the rocker switch 12 and the spring terminal 2 is interrupted.
  • actuation safety can be achieved inexpensively solely by constructive measures using the spring clamp 2 which is necessary anyway for break safety. It is therefore possible to dispense with an additional switch, which is necessary only for the safety of actuation and which interrupts the current path of the temperature limiter when the reset button 18 is actuated. This simplifies and reduces the cost of manufacturing the temperature limiter.
  • the force of the drive element 1 on the bar 6 of the spring clamp 2 is advantageously reduced, so that the spring clamp 2 relaxes and returns to its rest position.
  • the electrical contact between the spring terminal contact piece 9 and the rocker contact piece 13 opens, the switching rocker 12 being prevented mechanically by the stop element 17 from following the spring terminal contact piece 9 in its rest position. This mechanism ensures that the temperature limiter is unbreakable.
  • the temperature limiter has a cover 21 which can be fastened on the base plate 4 to protect the electrical switching device formed from the spring terminal 2 and the tilting system 3.
  • a particularly advantageous embodiment combines the reset button 18 and the two actuating elements in one part as a plunger with two stepped steps 19, 20.
  • a spring 23 inserted between a stop of the reset button 18 and the cover 21 prevents the reset button 18 from interfering with the tilting system 3 in its movement.
  • the reset button 18 is pressed in against the force of the spring 23, the first step 19 comes to rest on the bar 6 and then the second step 20 on the rocker switch 12.
  • the bar 6 has, for example, two extensions 6a and 6b (FIG. 2), which serve as a contact surface for the reset button 18.
  • the two stages 19 and 20 are formed at a distance a such that the reset button 18 removes the bar 6 from the stop surface 16 before the switching rocker 12 tilts back pushes the OFF position into the ON position so far that even after the rocker switch 12 tilts back into the ON position, a distance remains between the contact pieces 9 and 13 and the electrical contact between the spring terminal 2 and the rocker switch 12 is reliably interrupted ; the reset is actuation-safe, ie each time the reset button 18 is pressed in, the current path of the temperature limiter is interrupted, so that the system monitored with it cannot be operated electrically.
  • the actuation safety function can also be implemented in such a way that the two actuation elements form part of a lever arm which is resiliently attached to the cover 21 and can be actuated via the reset button 18.
  • a particularly robust construction which in any case forces the electrical contact between the contact pieces 9 and 13 to be interrupted when the reset button 18 is actuated, can be realized in that the rocker switch 12 is designed in such a way that it in turn lies advantageously on the stop element 17, when the spring clip contact piece 9 is pushed out of its normal working position, so that the rocker contact piece 13 and the spring clip contact piece 9 are electrically separated.
  • the stop element 17 is designed as part of the base plate 4.
  • the switch of the temperature limiter is advantageously designed as a changeover switch, which consists of the spring terminal contact piece 9 and an OFF contact piece 22 fastened to the base plate 4, and the rocker contact piece 13 is riveted onto the leaf spring 12a in such a way that the rocker contact piece is in the OFF position 13 and the OFF contact piece 22 are electrically short-circuited, so that the position of the rocker switch 12 can be monitored electrically.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermally Actuated Switches (AREA)

Description

Die Erfindung betrifft einen Temperaturbegrenzer der im Oberbegriff des Anspruchs 1 genannten Art.The invention relates to a temperature limiter mentioned in the preamble of claim 1.

Solche Temperaturbegrenzer sind zur Überwachung von Wärmeerzeugungsanlagen und zu deren Abschaltung im Falle eines übermässigen Temperaturanstieges einsetzbar. Ein Temperaturbegrenzer bleibt nach seinem Abschalten blockiert, bis er von Hand wieder eingeschaltet wird. Dazu dient in der Regel ein Rückstellknopf. Temperaturbegrenzer sind teilweise mit erweiterten Sicherheitsfunktionen wie z.B. einer Betätigungssicherheitseinrichtung oder Bruchsicherheitseinrichtung ausgerüstet. Die Betätigungssicherheitseinrichtung gewährleistet, dass die mit dem Temperaturbegrenzer überwachte Anlage nicht eingeschaltet werden kann, solange der Rückstellknopf betätigt ist.Such temperature limiters can be used to monitor heat generation systems and to switch them off in the event of an excessive temperature rise. A temperature limiter remains blocked after it is switched off until it is switched on again manually. A reset button is usually used for this. Temperature limiters are partly with extended safety functions such as an actuation safety device or breakage safety device. The actuation safety device ensures that the system monitored by the temperature limiter cannot be switched on as long as the reset button is pressed.

Ein Temperaturbegrenzer gemäss dem Oberbegriff des Anspruchs 1 ist unter der Bezeichnung RAK Serie 08 aus dem Datenblatt CE1P1147 D von Landis & Gyr vom April 1989 bekannt. Bei diesem Temperaturbegrenzer ist die Betätigungssicherheitsfunktion mittels eines zusätzlichen Schalters verwirklicht, der den Strompfad bei jedem Eindrücken des Rückstellknopfes unterbricht.A temperature limiter according to the preamble of claim 1 is known as RAK series 08 from the data sheet CE1P1147 D from Landis & Gyr from April 1989. With this temperature limiter, the actuation safety function is implemented by means of an additional switch which interrupts the current path each time the reset button is pressed.

Der Erfindung liegt die Aufgabe zugrunde, einen Temperaturbegrenzer mit einer Betätigungssicherheitseinrichtung ohne zusätzliche Teile wie beispielsweise Schalter zu verwirklichen.The invention has for its object to realize a temperature limiter with an actuation safety device without additional parts such as switches.

Die genannte Aufgabe wird erfindungsgemäss gelöst durch die Merkmale des Anspruchs 1.According to the invention, the stated object is achieved by the features of claim 1.

Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Fig. 1 bis 3 näher erläutert.An exemplary embodiment of the invention is explained in more detail below with reference to FIGS. 1 to 3.

Es zeigen:

Fig. 1
einen schematischen Aufbau eines Temperaturbegrenzers,
Fig. 2
eine Federklemme und
Fig. 3
eine Schaltwippe.
Show it:
Fig. 1
a schematic structure of a temperature limiter,
Fig. 2
a spring clip and
Fig. 3
a rocker switch.

Die Fig. 1 zeigt einen Ausschnitt eines Temperaturbegrenzers in der betriebsmässigen EIN-Stellung, dessen Schaltmechanismus in an sich bekannter Weise auf dem Zusammenspiel eines Antriebselementes 1, einer Federklemme 2, eines Kippsystems 3 und einer entsprechend gestalteten geometrischen Form einer Grundplatte 4 aufgebaut ist.Fig. 1 shows a section of a temperature limiter in the operational ON position, the switching mechanism is constructed in a manner known per se on the interaction of a drive element 1, a spring clip 2, a tilting system 3 and a correspondingly designed geometric shape of a base plate 4.

Die Fig. 2 zeigt die Draufsicht der Federklemme 2, die aus einem u-förmigen Rahmen 5 und aus einem Balken 6 besteht, dessen eines Ende über beispielsweise zwei Federstege 7 federnd im Bogen des Rahmens 5 angebracht und dessen anderes Ende frei ist. Auf dem Balken 6 sind in der Nähe der Federstege 7 ein Nocken 8 und beim freien Ende ein Federklemmenkontaktstück 9 angebracht. Der Rahmen 5 enthält Bohrungen 10a und 10b zur Befestigung der Federklemme 2 auf der Grundplatte 4 (Fig. 1).2 shows the top view of the spring clip 2, which consists of a U-shaped frame 5 and a beam 6, one end of which, for example, via two spring bars 7 resiliently mounted in the arch of the frame 5 and the other end is free. On the bar 6 near the spring bars 7, a cam 8 and a spring terminal contact piece 9 are attached at the free end. The frame 5 contains bores 10a and 10b for fastening the spring clip 2 on the base plate 4 (Fig. 1).

Die Fig. 3 zeigt die Draufsicht einer Schaltwippe 12, die als rechteckförmige Blattfeder 12a mit einer entlang der Längsseite freigestanzten Zunge 12b ausgebildet ist. Auf der einen Schmalseite der Blattfeder 12a beim festen Ende der Zunge 12b befindet sich ein Wippenkontaktstück 13 und auf der anderen Schmalseite der Blattfeder 12a gegenüber dem freien Ende der Zunge 12b befindet sich eine rechteckförmige Aussparung 12c. Zwischen dieser Aussparung 12c und dem freien Ende der Zunge 12b ist die Blattfeder 12a mit einer v-förmigen Prägung quer über die Blattfeder 12a versehen, die als Antriebsstelle 12d des Kippsystems 3 (Fig. 1) dient.FIG. 3 shows the top view of a rocker switch 12 which is designed as a rectangular leaf spring 12a with a tongue 12b punched out along the long side. On one narrow side of the leaf spring 12a at the fixed end of the tongue 12b there is a rocker contact piece 13 and on the other narrow side of the leaf spring 12a opposite the free end of the tongue 12b there is a rectangular recess 12c. Between this recess 12c and the free end of the tongue 12b, the leaf spring 12a is provided with a V-shaped embossment across the leaf spring 12a, which serves as the drive point 12d of the tilting system 3 (FIG. 1).

Das Kippsystem 3 in der Fig. 1 besteht aus einem starr auf der Grundplatte 4 angeordneten Träger 11, der ein erstes und ein zweites Schneidenlager 11a bzw. 11b aufweist, und aus der Schaltwippe 12a, b, d. Die Schaltwippe 12 (Fig. 3) ist mit ihrer Aussparung 12c im ersten Schneidenlager 11a eingehängt und stützt sich mit dem freien Ende der Zunge 12b im zweiten Schneidenlager 11b des Trägers 11 so ab, dass die Blattfeder 12a unter Zugspannung steht. Das so gebildete bistabile Kippsystem 3 kippt von einem stabilen Zustand in den anderen stabilen Zustand, wenn die Blattfeder 12a von der einen Seite des zweiten Schneidenlagers 11b über den Stützpunkt der Zunge 12b im zweiten Schneidenlager 11b hinweg gedrückt wird.The tilting system 3 in FIG. 1 consists of a support 11 arranged rigidly on the base plate 4, which has a first and a second cutting edge bearing 11a or 11b, and of the rocker switch 12a, b, d. The rocker switch 12 (FIG. 3) is suspended with its recess 12c in the first cutter bearing 11a and is supported with the free end of the tongue 12b in the second cutter bearing 11b of the carrier 11 in such a way that the leaf spring 12a is under tension. The bistable tilting system 3 thus formed tilts from one stable state to the other stable state when the leaf spring 12a is pressed from one side of the second cutting edge bearing 11b over the support point of the tongue 12b in the second cutting edge bearing 11b.

Die Federklemme 2 und der Träger 11 sind so an der Grundplatte 4 befestigt, dass in der betriebsmässigen EIN-Stellung des Temperaturbegrenzers die Federklemme 2 über den Nocken 8 auf die Antriebsstelle 12d des Kippsystems 3 einwirkt und dass das Federklemmenkontaktstück 9 und das Wippenkontaktstück 13 einen geschlossenen elektrischen Kontakt bilden. Das Antriebselement 1 ist so in die Grundplatte 4 eingebaut, dass es entlang einer y-Achse 14 verschiebbar ist. Beispielsweise ein mit einem Dehnstoff gefülltes Fühlersystem 15 bestimmt die Lage des Antriebselementes 1 auf der y-Achse 14 in Funktion der Temperatur. Das Antriebselement 1 wirkt etwa in der Mitte des Balkens 6 (Fig. 2) mit einer Kraft so auf den Balken 6 ein, dass das freie Ende des Balkens 6 gegen die Kraft des Federelementes 2 aus der Ruhelage auf der Grundplatte 4 angehoben wird, bis das Ende auf einer Anschlagsfläche 16 eines an der Grundplatte 4 befestigten Anschlagselementes 17 aufliegt und der Balken 6 die Auslenkung des Antriebselementes 1 mit dem Nocken 8 auf die Antriebsstelle 12d des Kippsystems 3 überträgt.The spring clamp 2 and the support 11 are fastened to the base plate 4 in such a way that in the operational ON position of the temperature limiter, the spring clamp 2 acts on the drive point 12d of the tilting system 3 via the cams 8 and that the spring clamp contact piece 9 and the rocker contact piece 13 have a closed one make electrical contact. The drive element 1 is installed in the base plate 4 in such a way that it can be displaced along a y-axis 14. For example, a sensor system 15 filled with an expansion material determines the position of the drive element 1 on the y-axis 14 as a function of the temperature. The drive element 1 acts approximately in the middle of the beam 6 (FIG. 2) with a force on the beam 6 such that the free end of the beam 6 is raised against the force of the spring element 2 from the rest position on the base plate 4 until the end rests on a stop surface 16 of a stop element 17 fastened to the base plate 4 and the bar 6 transmits the deflection of the drive element 1 with the cam 8 to the drive point 12d of the tilting system 3.

Bei steigender Temperatur nimmt die Krafteinwirkung des Antriebselementes 1 auf den Balken 6 zu, der Balken 6 dreht sich gegen die Federkraft des Rahmens 5 (Fig. 2) um die Anschlagsfläche 16 und drückt mit dem Nocken 8 auf die Antriebsstelle 12d des Kippsystems 3, bis beim Erreichen der Schalttemperatur die Blattfeder 12a über das zweite Schneidenlager 11b hinaus geschoben ist und das Kippsystem 3 in die stabile AUS-Stellung kippt und der elektrische Kontakt zwischen dem Wippenkontaktstück 13 und dem Federklemmenkontaktstück 9 unterbrochen ist.With increasing temperature, the force of the drive element 1 increases on the bar 6, the bar 6 rotates against the spring force of the frame 5 (Fig. 2) Stop surface 16 and presses the cam 8 onto the drive point 12d of the tilting system 3 until, when the switching temperature is reached, the leaf spring 12a is pushed beyond the second cutting edge bearing 11b and the tilting system 3 tilts into the stable OFF position and the electrical contact between the rocker contact piece 13 and the spring terminal contact piece 9 is interrupted.

Die Betätigungssicherheit beruht auf einem Mechanismus, bei dem ein Rückstellknopf 18 beim Betätigen über ein erstes Element auf den Balken 6 mit dem Federklemmenkontaktstück 9 und über ein zweites Element auf die Schaltwippe 12 mit dem Wippenkontaktstück 13 so einwirkt, dass zwischen dem Wippenkontaktstück 13 und dem Federklemmenkontaktstück 9 ein Abstand entsteht und der elektrische Kontakt zwischen der Schaltwippe 12 und der Federklemme 2 unterbrochen ist.The actuation safety is based on a mechanism in which a reset button 18 acts when actuated via a first element on the bar 6 with the spring terminal contact piece 9 and via a second element on the switching rocker 12 with the rocker contact piece 13 in such a way that between the rocker contact piece 13 and the spring terminal contact piece 9 a distance arises and the electrical contact between the rocker switch 12 and the spring terminal 2 is interrupted.

Vorteile dieser Lösung sind, dass die Betätigungssicherheit allein durch konstruktive Massnahmen unter Ausnutzung der für die Bruchsicherheit ohnehin notwendigen Federklemme 2 kostengünstig verwirklicht werden kann. Damit kann auf einen nur wegen der Betätigungssicherheit notwendigen zusätzlichen Schalter, der den Strompfad des Temperaturbegrenzers beim Betätigen des Rückstellknopfs 18 unterbricht, verzichtet werden. Somit vereinfacht und verbilligt sich die Herstellung des Temperaturbegrenzers.Advantages of this solution are that the actuation safety can be achieved inexpensively solely by constructive measures using the spring clamp 2 which is necessary anyway for break safety. It is therefore possible to dispense with an additional switch, which is necessary only for the safety of actuation and which interrupts the current path of the temperature limiter when the reset button 18 is actuated. This simplifies and reduces the cost of manufacturing the temperature limiter.

Bei einem Verlust des Dehnstoffes des Fühlersystems 15 durch ein Leck vermindert sich mit Vorteil die Kraft des Antriebselementes 1 auf den Balken 6 der Federklemme 2, so dass sich die Federklemme 2 entspannt und in ihre Ruhelage zurückkehrt. Dabei öffnet sich der elektrische Kontakt zwischen dem Federklemmenkontaktstück 9 und dem Wippenkontaktstück 13, wobei die Schaltwippe 12 durch das Anschlagselement 17 auf mechanische Weise gehindert ist, dem Federklemmenkontaktstück 9 in dessen Ruhelage zu folgen. Durch diesen Mechanismus ist die Bruchsicherheit des Temperaturbegrenzers gewährleistet.If the expansion material of the sensor system 15 is lost due to a leak, the force of the drive element 1 on the bar 6 of the spring clamp 2 is advantageously reduced, so that the spring clamp 2 relaxes and returns to its rest position. The electrical contact between the spring terminal contact piece 9 and the rocker contact piece 13 opens, the switching rocker 12 being prevented mechanically by the stop element 17 from following the spring terminal contact piece 9 in its rest position. This mechanism ensures that the temperature limiter is unbreakable.

Beispielsweise weist der Temperaturbegrenzer einen auf der Grundplatte 4 befestigbaren Deckel 21 zum Schutz der aus der Federklemme 2 und dem Kippsystem 3 gebildeten elektrischen Schaltvorrichtung auf. Eine besonders vorteilhafte Ausgestaltung fasst den Rückstellknopf 18 und die beiden Betätigungselemente in einem Teil als Stössel mit zwei abgesetzten Stufen 19, 20 zusammen. Eine zwischen einen Anschlag des Rückstellknopfes 18 und den Deckel 21 eingelegte Feder 23 verhindert, dass der Rückstellknopf 18 das Kippsystem 3 in der Bewegung stört. Beim Eindrücken des Rückstellknopfs 18 gegen die Kraft der Feder 23 kommt zuerst die erste Stufe 19 auf dem Balken 6 und alsdann die zweite Stufe 20 auf der Schaltwippe 12 zum Aufliegen. Der Balken 6 weist beispielsweise zwei Fortsätze 6a und 6b (Fig. 2) auf, die als Auflagefläche für den Rückstellknopf 18 dienen. Die beiden Stufen 19 und 20 sind in einem Abstand a derart ausgebildet, dass der Rückstellknopf 18 den Balken 6 von der Anschlagsfläche 16 vor dem Zurückkippen der Schaltwippe 12 von der AUS-Stellung in die EIN-Stellung so weit wegdrückt, dass auch nach dem Zurückkippen der Schaltwippe 12 in die EIN-Stellung ein Abstand zwischen den Kontaktstücken 9 und 13 verbleibt und die elektrische Kontaktgabe zwischen der Federklemme 2 und der Schaltwippe 12 sicher unterbrochen ist; die Rückstellung ist betätigungssicher, d.h. bei jedem Eindrücken des Rückstellknopfes 18 ist der Strompfad des Temperaturbegrenzers unterbrochen, so dass die damit überwachte Anlage elektrisch nicht betreibbar ist. Die Betätigungssicherheitsfunktion kann auch so verwirklicht sein, dass die beiden Betätigungselemente ein Teil eines federnd am Deckel 21 angebrachten Hebelarmes bilden, der über den Rückstellknopf 18 betätigbar ist.For example, the temperature limiter has a cover 21 which can be fastened on the base plate 4 to protect the electrical switching device formed from the spring terminal 2 and the tilting system 3. A particularly advantageous embodiment combines the reset button 18 and the two actuating elements in one part as a plunger with two stepped steps 19, 20. A spring 23 inserted between a stop of the reset button 18 and the cover 21 prevents the reset button 18 from interfering with the tilting system 3 in its movement. When the reset button 18 is pressed in against the force of the spring 23, the first step 19 comes to rest on the bar 6 and then the second step 20 on the rocker switch 12. The bar 6 has, for example, two extensions 6a and 6b (FIG. 2), which serve as a contact surface for the reset button 18. The two stages 19 and 20 are formed at a distance a such that the reset button 18 removes the bar 6 from the stop surface 16 before the switching rocker 12 tilts back pushes the OFF position into the ON position so far that even after the rocker switch 12 tilts back into the ON position, a distance remains between the contact pieces 9 and 13 and the electrical contact between the spring terminal 2 and the rocker switch 12 is reliably interrupted ; the reset is actuation-safe, ie each time the reset button 18 is pressed in, the current path of the temperature limiter is interrupted, so that the system monitored with it cannot be operated electrically. The actuation safety function can also be implemented in such a way that the two actuation elements form part of a lever arm which is resiliently attached to the cover 21 and can be actuated via the reset button 18.

Eine besonders robuste Konstruktion, die das Unterbrechen des elektrischen Kontaktes zwischen den Kontaktstücken 9 und 13 beim Betätigen des Rückstellknopfes 18 in jedem Fall erzwingt, ist dadurch verwirklichbar, dass die Schaltwippe 12 derart gestaltet ist, dass sie ihrerseits mit Vorteil auf dem Anschlagselement 17 aufliegt, wenn das Federklemmenkontaktstück 9 aus seiner normalen Arbeitslage weggedrückt ist, so dass das Wippenkontaktstück 13 und das Federklemmenkontaktstück 9 elektrisch getrennt sind. Eine vorteilhafte Ausgestaltung ergibt sich, wenn das Anschlagselement 17 als Teil der Grundplatte 4 ausgebildet ist. Mit Vorteil ist der Schalter des Temperaturbegrenzers als Umschalter ausgebildet, der aus dem Federklemmenkontaktstück 9 und aus einem an der Grundplatte 4 befestigten AUS-Kontaktstück 22 besteht, und ist das Wippenkontaktstück 13 so auf der Blattfeder 12a aufgenietet, dass in der AUS-Stellung das Wippenkontaktstück 13 und das AUS-Kontaktstück 22 elektrisch kurzgeschlossen sind, so dass die Stellung der Schaltwippe 12 elektrisch überwacht werden kann.A particularly robust construction, which in any case forces the electrical contact between the contact pieces 9 and 13 to be interrupted when the reset button 18 is actuated, can be realized in that the rocker switch 12 is designed in such a way that it in turn lies advantageously on the stop element 17, when the spring clip contact piece 9 is pushed out of its normal working position, so that the rocker contact piece 13 and the spring clip contact piece 9 are electrically separated. An advantageous embodiment results if the stop element 17 is designed as part of the base plate 4. The switch of the temperature limiter is advantageously designed as a changeover switch, which consists of the spring terminal contact piece 9 and an OFF contact piece 22 fastened to the base plate 4, and the rocker contact piece 13 is riveted onto the leaf spring 12a in such a way that the rocker contact piece is in the OFF position 13 and the OFF contact piece 22 are electrically short-circuited, so that the position of the rocker switch 12 can be monitored electrically.

Claims (7)

  1. A temperature limiter having a drive element (1) for a sensor element (15), a reset button (18) and an electrical switching contact formed from a spring terminal contact portion (9) on the bar (6) of a spring terminal (2) and a rocker contact portion (13) on the switching rocker (12) of a bistable tilt system (3) having an ON and an OFF-position, wherein after a limit temperature at the sensor element (15) is exceeded the tilt system (3) is in the OFF position and the switching contact (9, 13) is opened, characterised in that a base plate (4) is provided as a fixing element for the tilt system (3) and for the spring terminal (2), that arranged on the base plate (4) is a stop element (17) with a support surface (16) for the free end of the bar (6), which establishes the normal position of the bar (6) and the spring terminal contact portion (9) when lifted away from the base plate (4) by means of the drive element (1), that the movement of the switching rocker (12) is limited in a direction towards the base plate (4) by a means (9 and 17 respectively) in the ON-position, and that the reset button (18) has a rest position and two actuating elements (19; 20) for displacement of the bar (6) and for actuation of the switching rocker (12) wherein upon actuation of the reset button (18) to prevent contact between the two contact portions (9; 13) the first actuating element (19) pushes the free end of the bar (6) away from the support surface (16) before the switching rocker (12) tilts from the OFF-position into the ON-position by means of the second actuating element (20).
  2. A temperature limiter according to claim 1 characterised in that the reset button (18) is in the form of a thrust member which as the actuating elements has two steps (19; 20) which are displaced by a predetermined spacing (a).
  3. A temperature limiter according to claim 1 or claim 2 characterised in that the movement of the switching rocker (12) is limited by the rocker contact portion (13) or the stop element (17) in the ON-position in a direction towards the base plate (4).
  4. A temperature limiter according to one of claims 1 to 3 characterised in that the stop element (17) is an integral part of the base plate (4).
  5. A temperature limiter according to one of claims 1 to 4 characterised in that in the OFF-position the movement of the switching rocker (12) is limited in a direction away from the base plate (4) by an OFF-contact portion (22).
  6. A temperature limiter according to claim 5 characterised in that in the OFF-position the rocker contact portion (13) of the switching rocker (12) and the OFF-contact portion (22) form an electrical contact.
  7. A temperature limiter according to one of claims 1 to 6 characterised in that the electrical contact between the spring terminal contact portion (9) and the rocker contact portion (13) is separated as soon as, as a result of failure of the temperature sensor (15), the drive element (1) applies no force to the bar (6) and the spring terminal (2) is relieved of stress.
EP19930810713 1993-10-12 1993-10-12 Thermal cut out with a trip-free mechanism Expired - Lifetime EP0647957B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19930810713 EP0647957B1 (en) 1993-10-12 1993-10-12 Thermal cut out with a trip-free mechanism
DE59300293T DE59300293D1 (en) 1993-10-12 1993-10-12 Safety temperature limiter with free release mechanism.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19930810713 EP0647957B1 (en) 1993-10-12 1993-10-12 Thermal cut out with a trip-free mechanism

Publications (2)

Publication Number Publication Date
EP0647957A1 EP0647957A1 (en) 1995-04-12
EP0647957B1 true EP0647957B1 (en) 1995-06-21

Family

ID=8215042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930810713 Expired - Lifetime EP0647957B1 (en) 1993-10-12 1993-10-12 Thermal cut out with a trip-free mechanism

Country Status (2)

Country Link
EP (1) EP0647957B1 (en)
DE (1) DE59300293D1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005043255B3 (en) * 2005-09-09 2007-01-04 Simplex Armaturen + Fittings Gmbh & Co. Kg Valve fitting, e.g. for wall heater, has control unit to control return temperature of heater and formed as breakdown safety unit to switch off heater during breakdown, where valve and safety unit are arranged within valve arrangement
ITMI20060454U1 (en) * 2006-12-21 2008-06-22 T & G Spa REFINED LIMITER THERMOSTAT
CN114779852B (en) * 2022-04-28 2023-10-31 徐州凯特电器设备有限公司 Intelligent temperature controller capable of automatically powering off

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH345684A (en) * 1956-07-30 1960-04-15 Landis & Gyr Ag Temperature limiter with thermally triggered toggle switch
DE1180026B (en) * 1958-04-09 1964-10-22 Licentia Gmbh Heat switch with a snap switch
DE2605465A1 (en) * 1976-02-12 1977-08-18 Emerson Electric Gmbh Switch with thermal safety tripping - with manually operated resetting mechanism and contact arm engageable by push rods
DE3010445A1 (en) * 1979-03-30 1980-10-09 Ego Regeltech Temp. controller for protection switch - has snap-action spring for switch which prevents return to on-position from off-position

Also Published As

Publication number Publication date
DE59300293D1 (en) 1995-07-27
EP0647957A1 (en) 1995-04-12

Similar Documents

Publication Publication Date Title
EP1203385B1 (en) Multipolar circuit-protection assembly for a collector rail system
DE3411275C2 (en)
DE2600333B2 (en) Resettable circuit breaker
DE102009043105B4 (en) Electrical switching device with a contact bridge
DE3411273C2 (en) Circuit breaker
DE102006031584A1 (en) Miniaturized electrical switch
DE2917557C2 (en) Thermal circuit breaker
EP0088747B1 (en) Thermostatic switch
EP0107152A1 (en) Thermostat
EP0347592B1 (en) Door latch device for electric apparatuses
EP0391086B1 (en) Push button operated overload circuit breaker
EP0647957B1 (en) Thermal cut out with a trip-free mechanism
DE2747784A1 (en) ELECTRIC SAFETY DISCONNECTOR
EP0058409B1 (en) Pressure-operated electric switching device
DE2732723C2 (en) Electrical switching device
EP0824262B1 (en) Snap action switch with casing
DE102022205306B3 (en) surge protection arrangements
DE2745548C3 (en) Intrinsically safe temperature limiter
DE3338244C2 (en)
EP0805469B1 (en) Electrical switchgear
DE2815095C3 (en) Bimetal relay
DE3322297C2 (en)
DE10243597B4 (en) breakers
CH670013A5 (en)
DE3009255C2 (en) Changeover contact device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19940826

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ETHECO EUROPEAN THERMOSTAT COMPANY

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR IT LI NL

REF Corresponds to:

Ref document number: 59300293

Country of ref document: DE

Date of ref document: 19950727

ET Fr: translation filed
ITF It: translation for a ep patent filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: GERHARD H. ULRICH PATENTANWALT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20001020

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020501

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20020501

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20021017

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20021029

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20021218

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031031

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040501

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040630

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051012