EP0088747A1 - Thermostatic switch - Google Patents

Thermostatic switch Download PDF

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Publication number
EP0088747A1
EP0088747A1 EP83890027A EP83890027A EP0088747A1 EP 0088747 A1 EP0088747 A1 EP 0088747A1 EP 83890027 A EP83890027 A EP 83890027A EP 83890027 A EP83890027 A EP 83890027A EP 0088747 A1 EP0088747 A1 EP 0088747A1
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EP
European Patent Office
Prior art keywords
point
bimetallic snap
transmission member
snap disk
attack
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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.)
Granted
Application number
EP83890027A
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German (de)
French (fr)
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EP0088747B1 (en
Inventor
Helmut Dipl.-Ing. Bayer
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Electrovac AG
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Electrovac AG
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Publication of EP0088747A1 publication Critical patent/EP0088747A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H37/5409—Bistable switches; Resetting means

Definitions

  • the invention relates to a thermal switch with a temperature sensor formed from a bimetallic snap disk, which interacts via a transmission member with a contact system which has at least one movable contact-carrying or forming contact carrier, the movable contact rests under spring force on at least one fixed contact and in the event of a temperature-related movement of the transmission member, at least approximately perpendicular to the direction of adjustment of the same under spring force in the direction of the transmission member, there is provided a locking member which moves the contact carrier after a temperature-related. Holds movement in its end position.
  • Thermal switches are often used as temperature limiters, where they have the task of switching off an electrically heated device or switching on a warning device when a maximum permissible temperature is reached.
  • the electrically heated device is generally switched on again automatically or the warning device is switched off. This reactivation of the device or the deactivation of the warning device also takes place if the cause of the rise in temperature up to the maximum permissible maximum value is in a defective device, that is, even if the error has not been remedied.
  • thermal switches have already become known in which an at least approximately perpendicular to the direction of movement of the transmission member acting under the force of a spring inhibitor is provided, which during or after displacement of the transmission member due to the temperature-related movement of the thermobimetal element Change in the switching state of the contact system achieved thereby prevented.
  • a thermal switch has become known from US Pat. No. 3,081,388, in which an inhibiting device which is essentially designed as a blocking member acts on a movable spring of the contact system.
  • the locking member which is under the force of a spring, bears against the contact spring and has a projection for this purpose. If the contact spring is pressed upwards by the thermobimetal element via the transmission element, the projection engages under the contact spring, so that it is held in this position, even if the thermobimetal element returns to the starting position.
  • a thermal switch has become known from AT-PS 354 140, in which the inhibiting device acts directly on the transmission element.
  • thermal switches are relatively complex. In particular with small electrical devices, however, this represents a considerable disadvantage because the installation of such switches results in a not inconsiderable increase in price. Among other things, this applies especially with electric irons, for example, where protection against overheating is of the utmost importance.
  • the temperature regulators built into electric irons, with which the ironing temperature can be adjusted depending on the material to be ironed, can fail, especially after prolonged use, which results in overheating, which in turn can cause a fire.
  • the aim of the invention is accordingly to provide a thermal switch that is as simple, inexpensive and suitable for mass production as possible, but which nevertheless functions perfectly and is insensitive to impact.
  • the point of application of the thermal bimetallic snap disc on the transfer member is located at the end of the transfer member facing away from the contact system and, with two bearing points of the thermal bimetallic snap disk, is at least approximately arranged in a plane lying parallel to the adjustment direction of the transfer member, the one bearing point the edge of the bimetallic snap disk opposite the point of attack and the second bearing point between the Attack point and the first bearing point, and wherein the locking member is arranged at the end of the transmission member facing away from the contact system.
  • the distance of the point of attack from the first bearing point forms the load arm of the lever, the distance of the second bearing point from the first bearing point forms the power arm.
  • the adjustment path of the end of the load arm, which acts on the transmission element, which is decisive for the path of the movable contact of the contact system, is greater the closer the second bearing point is to the first bearing point.
  • the locking member is arranged at the end of the transmission member facing away from the contact system, a sufficiently large distance of the locking member from the contact system and thus from its contacts is achieved.
  • the displacement of the point of attack of the bimetallic snap disk at the end of the transmission member facing away from the contact system is greater than the extent of the part of the locking member which brings about the locking parallel to the longitudinal direction of the transmission member, whereby the locking member is certain to move back after a temperature-related deformation of the bimetallic snap disk of the contact system prevented in its starting position.
  • FIGS. 1 to 3 has a housing 1 which is provided with a base plate 2.
  • a bimetallic snap disk 3 which interacts with a transmission member 4 which can be locked with a locking member 5 after a temperature-related movement of the transmission member 4.
  • the transmission element 4 interacts with a contact system which has two connecting lugs 6, 7, the connecting lug 6 being fastened to the housing 1 with a rivet 8.
  • the connecting lug 7 is also fastened to the housing 1 with a rivet which forms the fixed contact 9 of the contact system.
  • a resilient contact carrier 10 is also attached to the housing 1, which carries a movable contact 11 which is opposite the fixed contact 9.
  • the contacts 9, 11 form a normally closed contact.
  • the bimetallic snap disk 3 is mounted on the base plate 2 at two bearing points 12, 13.
  • One bearing point 12 holds the edge of the bimetallic snap disk 3 against the base plate 2, whereas the second bearing point 13 is formed by a bulge in the base plate 2 on which the bimetallic snap disk 3 rests. That of the first Bearing point 12 opposite edge of the bimetallic snap disk 3 lies below the end of the transmission element 4 facing away from the contact system, against which the locking element 5 rests in the starting position shown in FIG.
  • the locking member 5 consists of a leaf spring pressing against the transmission member 4, which is attached to a locking member holder .14 with a rivet 15.
  • the point of attack of the thermal bimetallic snap disk 3 on the transfer member 4 is thus arranged on the end of the transfer member 4 facing away from the contact system with the two bearing points 12, 13 of the thermal bimetallic snap disk 3 in a plane in which the central axis of the transfer member 4 also lies, the second bearing 13 is arranged on the transmission member 4 between the first bearing point 12 and the point of application of the bimetallic snap disk 3.
  • a one-armed lever is formed, the force arm of which is formed by the two bearing points 12, 13 and the load arm of which is formed by the first bearing point 12 and the point of application of the bimetallic snap disk 3 on the transmission element 4.
  • the bimetallic snap disk 3 If the bimetallic snap disk 3 is now heated, it jumps when the snap temperature is reached into the position shown in FIG. 2, whereby the locking member 4 moves in the direction of arrow 16 and the contact carrier 10 is adjusted in such a way that the contacts 9, 11 are separated the connected circuit is interrupted.
  • the bimetallic snap disk 3 If the bimetallic snap disk 3 is now cooled again, it springs back into the position shown in FIG. 1 when the relevant snap temperature is reached. However, the locking member 5 still engages under the transmission member 4, so that the contacts 9, 11 are kept in the separate position even after the thermal bimetallic snap disk 3 has cooled.
  • the locking element 5 must be pushed away from the transmission element 4, for example with the aid of a tool, so that it is moved into the position shown in FIG. 1 under the force of the resilient contact carrier 10 brought.
  • Figures 4 to 6 differs from that of Figures 1 to 3 first in that the locking member 5, as shown in Figures 4 to 6, not in the starting position against the transmission member 4, but against the end face of the Thermo bimetallic snap disk 3 presses.
  • the transmission member 4 rests only on the thermal bimetallic snap disk 3 under the force of the resilient contact carrier 10 (FIG. 1).
  • the blocking member 5 does not immediately engage under the transmission member 4, as is the case in the exemplary embodiment according to FIGS. 1 to 3, but the bimetallic snap disk 3.
  • the bimetallic snap disk 3 remains in that shown in FIG Position, although it takes the form as shown in Fig.4.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

Bei einem thermischen Schalter mit einer über ein Übertragungsglied (4) auf ein Kontaktsystem (9, 11) wirkenden Thermobimetallschnappscheibe (3) ist diese als einarmig wirkender Hebel ausgebildet, wobei die Angriffsstelle der Thermobimetallschnappscheibe (3) an dem dem Kontaktsystem (9, 11) abgewandten Ende des Übertragungsgliedes (4) liegt und die Thermobimetallschnappscheibe (3) einerseits an einem der Angriffsstelle am Übertragungsglied (4) gegenüberliegenden Rand derselben, anderseits zwischen diesem und der Angriffsstelle gelagert ist. Die Lagerungen (12, 13) und die Angriffsstelle sind in einer parallel zur Verstellrichung des Übertragungsgliedes (4) liegenden Ebene angeordnet. Um eine selbsttätige Rückstellung des Kontaktsystems (9, 11) nach einem temperaturbedingten Schaltvorgang zu vermeiden, ist an dem der Thermobimetallschnappscheibe (3) zugewandten Ende des Übertragungsgliedes (4) ein Sperrglied (5) angeordnet, das nach dem temperaturbedingten Schaltvorgang das Übertragungsglied (4) und bzw. oder die Thermobimetallschnappscheibe (3) untergreift.In the case of a thermal switch with a thermobimetal snap disc (3) acting on a contact system (9, 11) via a transmission element (4), the latter is designed as a lever with one arm, the point of attack of the thermobimetal snap disc (3) on the contact system (9, 11) opposite end of the transmission member (4) and the thermal bimetallic snap disc (3) is on the one hand at one of the point of attack on the transmission member (4) opposite edge thereof, and on the other hand is mounted between the latter and the point of attack. The bearings (12, 13) and the point of attack are arranged in a plane lying parallel to the direction of adjustment of the transmission element (4). In order to avoid an automatic resetting of the contact system (9, 11) after a temperature-related switching operation, a locking member (5) is arranged on the end of the transmission member (4) facing the thermobimetal snap disk (3), which locks the transmission member (4) after the temperature-related switching operation. and / or engages under the bimetallic snap disk (3).

Description

Die Erfindung betrifft einen thermischen Schalter mit einem aus einer Thermobimetallschnappscheibe gebildeten Temperaturfühler, der über ein Übertragungsglied mit einem Kontaktsystem zusammenwirkt, das einen mindestens einen beweglichen Kontakt tragenden bzw. bildenden Kontaktträger aufweist, wobei der bewegliche Kontakt unter Federkraft im Ruhezustand an mindestens einem festen Kontakt anliegt und ein bei einer temperaturbedingten Bewegung des Übertragungsgliedes zumindest angenähert senkrecht zur Verstellrichtung desselben unter Federkraft in Richtung zum Übertragungsglied verstellbares Sperrglied vorgesehen ist, das den Kontaktträger nach einer temperaturbedingten . Bewegung desselben in seiner Endstellung festhält.The invention relates to a thermal switch with a temperature sensor formed from a bimetallic snap disk, which interacts via a transmission member with a contact system which has at least one movable contact-carrying or forming contact carrier, the movable contact rests under spring force on at least one fixed contact and in the event of a temperature-related movement of the transmission member, at least approximately perpendicular to the direction of adjustment of the same under spring force in the direction of the transmission member, there is provided a locking member which moves the contact carrier after a temperature-related. Holds movement in its end position.

Thermische Schalter werden häufig als Temperaturbegrenzer eingesetzt, wo sie die Aufgabe haben, bei Erreichen einer maximal zulässigen Temperatur ein elektrisch geheiztes Gerät abzuschalten bzw. eine Warneinrichtung einzuschalten. Bei den thermischen Schaltern üblicher Bauart wird bei Absinken der Temperatur vom erreichten Maximalwert das elektrisch geheizte Gerät im allgemeinen wieder selbsttätig eingeschaltet bzw. die Warneinrichtung abgeschaltet. Dieses Wiedereinschalten des Gerätes bzw. das Abschalten der Warneinrichtung erfolgt auch dann, wenn die Ursache des Ansteigens der Temperatur bis zum maximal zulässigen Höchstwert in einem fehlerhaften Gerät liegt, also auch dann, wenn der Fehler nicht behoben wurde.Thermal switches are often used as temperature limiters, where they have the task of switching off an electrically heated device or switching on a warning device when a maximum permissible temperature is reached. In the case of the thermal switches of conventional design, when the temperature drops from the maximum value reached, the electrically heated device is generally switched on again automatically or the warning device is switched off. This reactivation of the device or the deactivation of the warning device also takes place if the cause of the rise in temperature up to the maximum permissible maximum value is in a defective device, that is, even if the error has not been remedied.

Um diesen Nachteil zu vermeiden, sind bereits thermische Schalter bekannt geworden, bei denen eine zumindest angenähert senkrecht zur Bewegungsrichtung des Übertragungsgliedes wirkende, unter der Kraft einer Feder stehende Hemmvorrichtung vorgesehen ist, die bei bzw. nach Verschiebung des Übertragungsgliedes durch die temperaturbedingte Bewegung des Thermobimetallelementes eine Veränderung des dadurch erreichten Schaltzustandes des Kontaktsystems verhindert.In order to avoid this disadvantage, thermal switches have already become known in which an at least approximately perpendicular to the direction of movement of the transmission member acting under the force of a spring inhibitor is provided, which during or after displacement of the transmission member due to the temperature-related movement of the thermobimetal element Change in the switching state of the contact system achieved thereby prevented.

So ist durch die US-PS 3 081 388 ein thermischer Schalter bekannt geworden, bei dem eine im wesentlichen als Sperrglied ausgebildete Hemmvorrichtung auf eine bewegliche Feder des Kontaktsystems einwirkt. Das unter der Kraft einer Feder stehende Sperrglied liegt an der Kontaktfeder an und weist hierzu einen Vorsprung auf. Wird die Kontaktfeder durch das Thermobimetallelement über das Übertragungsglied nach oben gedrückt, so untergreift der Vorsprung die Kontaktfeder, so daB diese in dieser Stellung festgehalten wird, auch wenn das Thermobimetallelement Wieder die Ausgangslage einnimmt.Thus, a thermal switch has become known from US Pat. No. 3,081,388, in which an inhibiting device which is essentially designed as a blocking member acts on a movable spring of the contact system. The locking member, which is under the force of a spring, bears against the contact spring and has a projection for this purpose. If the contact spring is pressed upwards by the thermobimetal element via the transmission element, the projection engages under the contact spring, so that it is held in this position, even if the thermobimetal element returns to the starting position.

Durch die AT-PS 354 140 ist ein thermischer Schalter bekannt geworden, bei dem die Hemmvorrichtung unmittelbar auf das Übertragungsglied einwirkt.A thermal switch has become known from AT-PS 354 140, in which the inhibiting device acts directly on the transmission element.

Die bekannten thermischen Schalter sind relativ aufwendig. Insbesondereobei elektrischen Kleingeräten stellt dies aber einen erheblichen Nachteil dar, weil der Einbau solcher Schalter eine nicht unerhebliche Verteuerung zur Folge hat. Dies trifft u.a. vor allem beispielsweise bei elektrischen Bügeleisen zu, bei denen eine Sicherung gegen Überhitzung von größter Bedeutung ist. Die in elektrischen Bügeleisen eingebauten Temperaturregler, mit denen die Bügeltemperatur je nach dem zu bügelnden Material einstellbar ist, können, insbesondere nach längerem Gebrauch, versagen, was eine Überhitzung zur Folge hat, die wieder Ursache einer Brandentstehung sein kann.The known thermal switches are relatively complex. In particular with small electrical devices, however, this represents a considerable disadvantage because the installation of such switches results in a not inconsiderable increase in price. Among other things, this applies especially with electric irons, for example, where protection against overheating is of the utmost importance. The temperature regulators built into electric irons, with which the ironing temperature can be adjusted depending on the material to be ironed, can fail, especially after prolonged use, which results in overheating, which in turn can cause a fire.

Das Ziel der Erfindung besteht demgemäß darin, einen möglichst einfachen, billigen und für Massenfertigung.geeigneten thermischen Schalter zu schaffen, der dennoch einwandfrei funktioniert und stoßunempfindlich ist.The aim of the invention is accordingly to provide a thermal switch that is as simple, inexpensive and suitable for mass production as possible, but which nevertheless functions perfectly and is insensitive to impact.

Erfindungsgemäß liegt bei einem thermischen Schalter der eingangs genannten Art die Angriffsstelle der Thermobimetallschnappscheibe an dem Übertragungsglied an dem dem Kontaktsystem abgewandten Ende des Übertragungsgliedes und ist mit zwei Lagerstellen der Thermobimetallschnappscheibe zumindest angenähert in einer parallel zur Verstellrichtung des Übertragungsgliedes liegenden Ebene angeordnet, wobei die eine Lagerstelle an dem der Angriffsstelle gegenüberliegenden Rand der Thermobimetallschnappscheibe und die zweite Lagerstelle zwischen der Angriffsstelle und der ersten Lagerstelle liegt, und wobei das Sperrglied bei dem dem Kontaktsystem abgewandten Ende des Übertragungsgliedes angeordnet ist.According to the invention, in the case of a thermal switch of the type mentioned at the beginning, the point of application of the thermal bimetallic snap disc on the transfer member is located at the end of the transfer member facing away from the contact system and, with two bearing points of the thermal bimetallic snap disk, is at least approximately arranged in a plane lying parallel to the adjustment direction of the transfer member, the one bearing point the edge of the bimetallic snap disk opposite the point of attack and the second bearing point between the Attack point and the first bearing point, and wherein the locking member is arranged at the end of the transmission member facing away from the contact system.

Durch diese MaBnahme wird nicht nur das angestrebte Ziel erreicht. Dadurch, daß die Angriffsstelle der Thermobimetallschnappscheibe an dem dem Kontakt-. system abgewandten Ende des Übertragungsgliedes mit zwei Lagerstellen der Thermobimetallschnappscheibe zumindest angenähert in einer parallel zur Verstellrichtung des Übertragungsgliedes liegenden Ebene angeordnet ist, wobei die eine Lagerstelle an dem der Angriffsstelle gegenüberliegenden Rand der Thermobisetallschnappscheibe und die zweite Lagerstelle zwischen der Angriffsstelle und der ersten Lagerstelle liegt, ergibt sich für die Betätigung des Übertragungsgliedes durch die Thermobimetallschnappscheibe ein einarmiger Hebel, der an der ersten Lagerstelle schwenkbar gelagert ist.und bei dem die zweite Lagerstelle die Angriffsstelle der den Hebel verschwenkenden Kraft bildet, die durch die temperaturbedingte Formver- änderung der Thermobimetallschnappscheibe bestimmt ist. Die Entfernung der Angriffsstelle von der ersten Lagerstelle bildet den Lastarm des Hebels, die Entfernung der zweiten Lagerstelle von der ersten Lagerstelle den Kraftarm. Der für den Weg des beweglichen Kontaktes des Kantaktsystems maßgebliche Verstellweg des Endes des Lastarmes, das am Übertragungsglied angreift, ist umso größer je näher die zweite Lagerstelle der ersten Lagerstelle liegt.This measure not only achieves the desired goal. The fact that the point of attack of the bimetallic snap disc on the contact. End of the transmission member facing away from the system with two bearing points of the bimetallic snap disk is arranged at least approximately in a plane lying parallel to the direction of adjustment of the transmission member, the one bearing point lying at the edge of the bimetallic snap disk opposite the point of attack and the second bearing point between the point of attack and the first bearing point there is a one-armed lever for the actuation of the transmission member by the thermobimetal snap disk, which is pivotably mounted at the first bearing point and in which the second bearing point forms the point of application of the force pivoting the lever, which is determined by the temperature-related change in shape of the thermobimetal snap disk. The distance of the point of attack from the first bearing point forms the load arm of the lever, the distance of the second bearing point from the first bearing point forms the power arm. The adjustment path of the end of the load arm, which acts on the transmission element, which is decisive for the path of the movable contact of the contact system, is greater the closer the second bearing point is to the first bearing point.

Dadurch, daß das Sperrglied bei dem dem Kontaktsystem abgewandten Ende des Übertragungsgliedes angeordnet ist, wird ein hinreichend groBer Abstand des Sperrgliedes vom Kontaktsystem und damit von dessen Kontakten erzielt.Due to the fact that the locking member is arranged at the end of the transmission member facing away from the contact system, a sufficiently large distance of the locking member from the contact system and thus from its contacts is achieved.

Vorteilhafterweise ist der Verstellweg der Angriffsstelle der Thermobimetallschnappscheibe an dem dem Kontaktsystem abgewandten Ende des Übertragungsgliedes größer als die Ausdehnung des die Sperre herbeiführenden Teiles des Sperrgliedes parallel zur Längsrichtung des Übertragungsgliedes, wodurch erreicht wird, daß das Sperrglied nach einer temperaturbedingten Verformung der Thermobimetallschnappscheibe mit Sicherheit eine Rückbewegung des Kontaktsystems in seine Ausgangslage verhindert.Advantageously, the displacement of the point of attack of the bimetallic snap disk at the end of the transmission member facing away from the contact system is greater than the extent of the part of the locking member which brings about the locking parallel to the longitudinal direction of the transmission member, whereby the locking member is certain to move back after a temperature-related deformation of the bimetallic snap disk of the contact system prevented in its starting position.

Dies wird zweckmäßigerweise dadurch realisiert, daß das Sperrglied in der sperrenden Stellung das Übertragungsglied oder die Thermobimetallschnappscheibe untergreift.This is expediently realized in that the locking member in the locking position, the transmission member or the bimetallic snap under the pane.

Die Erfindung wird anhand der Zeichnung näher erläutert, in der zwei Ausführungsbeispiele schematisch dargestellt sind. Es zeigen:

  • Fig.1 einen Schnitt nach der Linie I-I der Fig.3 eines erfindungsgemäßen thermischen Schalters in seiner Ausgangsstellung;
  • Fig.2 in seiner Stellung nach einer temperaturbedingten Verformung der Thermobimetallschnappscheibe;
  • Fig.3 einen Schnitt nach der Linie III-III der Fig. 1;
  • Fig. 4 bis 6 ein zweites Ausführungsbeispiel, wobei nur jene Teile des thermischen Schalters dargestellt sind, die den Verstellmechanismus des Übertragungsgliedes versinnbildlichen; wobei die Fig.4 einen Schnitt nach der Linie IV-IV der Fig.6 in der Ausgangsstellung, die Fig.5 einen Schnitt nach der Linie IV-IV der Fig.6 in der Stellung nach einer temperaturbedingten Verformung der Thermobimetallschnappscheibe und Fig.6 einen Schnitt nach der Linie VI-VI der Fig.4 zeigt.
The invention is explained in more detail with reference to the drawing, in which two exemplary embodiments are shown schematically. Show it:
  • 1 shows a section along the line II of Figure 3 of a thermal switch according to the invention in its initial position;
  • 2 in its position after a temperature-related deformation of the bimetallic snap disk;
  • 3 shows a section along the line III-III of Fig. 1;
  • 4 to 6 show a second exemplary embodiment, only those parts of the thermal switch which represent the adjusting mechanism of the transmission element being shown; 4 shows a section along line IV-IV of FIG. 6 in the starting position, FIG. 5 shows a section along line IV-IV of FIG. 6 in the position after a temperature-related deformation of the bimetallic snap disk, and FIG. 6 a section along the line VI-VI of Figure 4 shows.

Das in den Figuren 1 bis 3 dargestellte Ausführungsbeispiel weist ein Gehäuse 1 auf, das mit einer Bodenplatte 2 versehen ist. Im Gehäuse 1 befindet sich eine Thermobimetallschnappscheibe 3, die mit einem Übertragungsglied 4 zusammenwirkt, das mit einem Sperrglied 5 nach einer temperaturbedingten Bewegung des Übertragungsgliedes 4 verriegelbar ist. Das Übertragungsglied 4 wirkt mit einem Kontaktsystem zusammen, das zwei Anschlußfahnen 6,7 aufweist, wobei die AnschluBfahne 6 mit einem Niet 8 am Gehäuse 1 befestigt ist. Die AnschluBfahne 7 ist gleichfalls mit einem Niet am Gehäuse 1 befestigt, der den festen Kontakt 9 des Kontaktsystems bildet. Mit dem Niet 8 ist auch ein federnder Kontaktträger 10 am Gehäuse 1 befestigt, der einen beweglichen Kontakt 11 trägt, der dem festen Kontakt 9 gegenüberliegt. Die Kontakte 9,11 bilden dabei einen Ruhekontakt.The exemplary embodiment shown in FIGS. 1 to 3 has a housing 1 which is provided with a base plate 2. In the housing 1 there is a bimetallic snap disk 3 which interacts with a transmission member 4 which can be locked with a locking member 5 after a temperature-related movement of the transmission member 4. The transmission element 4 interacts with a contact system which has two connecting lugs 6, 7, the connecting lug 6 being fastened to the housing 1 with a rivet 8. The connecting lug 7 is also fastened to the housing 1 with a rivet which forms the fixed contact 9 of the contact system. With the rivet 8, a resilient contact carrier 10 is also attached to the housing 1, which carries a movable contact 11 which is opposite the fixed contact 9. The contacts 9, 11 form a normally closed contact.

Die Thermobimetallschnappscheibe 3 ist an der Bodenplatte 2 an zwei Lagerstellen 12,13 gelagert. Die eine Lagerstelle 12 hält den Rand der Thermobimetallschnappscheibe 3 an die Bodenplatte 2, wohingegen die zweite Lagerstelle 13 durch eine Ausbuchtung der Bodenplatte 2 gebildet ist, auf der die Thermobimetallschnappscheibe 3 aufruht. Der der ersten Lagerstelle 12 gegenüberliegende Rand der Thermobimetallschnappscheibe 3 liegt unterhalb des dem Kontaktsystem abgewandten Endes des Übertragungsgliedes 4, an dem das Sperrglied 5 in der in Fig.1 dargestellten Ausgangsstellung anliegt. Das Sperrglied 5 besteht dabei aus einer gegen das Übertragungsglied 4 drückenden Blattfeder, die an einer Sperrgliedhalterung .14 mit einem Niet 15 befestigt ist.The bimetallic snap disk 3 is mounted on the base plate 2 at two bearing points 12, 13. One bearing point 12 holds the edge of the bimetallic snap disk 3 against the base plate 2, whereas the second bearing point 13 is formed by a bulge in the base plate 2 on which the bimetallic snap disk 3 rests. That of the first Bearing point 12 opposite edge of the bimetallic snap disk 3 lies below the end of the transmission element 4 facing away from the contact system, against which the locking element 5 rests in the starting position shown in FIG. The locking member 5 consists of a leaf spring pressing against the transmission member 4, which is attached to a locking member holder .14 with a rivet 15.

Die Angriffsstelle der Thermobimetallschnappscheibe 3 an dem Übertragungsglied 4 ist somit an dem dem Kontaktsystem abgewandten Ende des Übertragungsgliedes 4 mit den beiden Lagerstellen 12,13 der Thermobimetallschnappscheibe 3 in einer Ebene angeordnet, in der auch die Mittelachse des Übertragungsgliedes 4 liegt, wobei die zweite Lagerstelle 13 zwischen der ersten Lagerstelle 12 und der Angriffsstelle der Thermobimetallschnappscheibe 3 an dem Übertragungsglied 4 angeordnet ist. Dadurch wird ein einarmiger Hebel gebildet, dessen Kraftarm durch die beiden Lagerstellen 12,13 und dessen Lastarm durch die erste Lagerstelle 12 und die Angriffsstelle der Thermobimetallschnappscheibe 3 am Übertragungsglied 4 gebildet wird.The point of attack of the thermal bimetallic snap disk 3 on the transfer member 4 is thus arranged on the end of the transfer member 4 facing away from the contact system with the two bearing points 12, 13 of the thermal bimetallic snap disk 3 in a plane in which the central axis of the transfer member 4 also lies, the second bearing 13 is arranged on the transmission member 4 between the first bearing point 12 and the point of application of the bimetallic snap disk 3. As a result, a one-armed lever is formed, the force arm of which is formed by the two bearing points 12, 13 and the load arm of which is formed by the first bearing point 12 and the point of application of the bimetallic snap disk 3 on the transmission element 4.

In der in Fig.1 dargestellten und in Fig.3 voll gezeichneten Ausgangsstellung befindet sich der von der ersten Lagerstelle 12 abgewandte Rand der Thermobimetallschnappscheibe 3 unterhalb des Übertragungsgliedes 4, wobei die Thermobimetallschnappscheibe 3 in Richtung zum Kontaktsystem durchgebogen ist, der bewegliche Kontakt 11 am festen Kontakt 9 anliegt und ein an die Anschlußfahnen 6,7 angeschlossener Stromkreis geschlossen ist. Das Sperrglied 5 liegt in dieser Ausgangsstellung am AuBenumfang des Übertragungsgliedes 4 an.In the initial position shown in FIG. 1 and fully drawn in FIG. 3, the edge of the thermal bimetallic snap disk 3 facing away from the first bearing point 12 is located below the transfer element 4, the thermal bimetallic snap disk 3 being bent in the direction of the contact system, the movable contact 11 being fixed Contact 9 is present and a circuit connected to the terminal lugs 6, 7 is closed. In this starting position, the locking member 5 rests on the outer circumference of the transmission member 4.

Wird nun die Thermobimetallschnappecheibe 3 erwärmt, so springt sie bei Erreichen der Schnapptemperatur in die in Fig.2 dargestellte Stellung, wodurch das Sperrglied 4 in Richtung des Pfeiles 16 bewegt und der Kontaktträger 10 in dem Sinne verstellt wird, daß die Kontakte 9,11 getrennt werden, der angeschlossene Stromkreis also unterbrochen wird. Dabei untergreift das Sperrglied 5, wie dies strichliert in Fig.3 dargestellt ist, das Übertragungsglied 4, wodurch dieses in jener Lage gehalten wird, in der die Kontakte 9,11 getrennt sind.If the bimetallic snap disk 3 is now heated, it jumps when the snap temperature is reached into the position shown in FIG. 2, whereby the locking member 4 moves in the direction of arrow 16 and the contact carrier 10 is adjusted in such a way that the contacts 9, 11 are separated the connected circuit is interrupted. The locking member 5, as shown in broken lines in FIG. 3, engages under the transmission member 4, as a result of which it is held in the position in which the contacts 9, 11 are separated.

Wird nunmehr die Thermobimetallschnappscheibe 3 wieder abgekühlt, so springt sie bei Erreichen der bezüglichen Schnapptemperatur in die in Fig.1 gezeigte Lage zurück. Das Sperrglied 5 untergreift aber nach wie vor das Übertragungsglied 4, so daß auch nach Abkühlung der Thermobimetallschnappscheibe 3 die Kontakte 9,11 in der voneinander getrennten Stellunggehalten werden.If the bimetallic snap disk 3 is now cooled again, it springs back into the position shown in FIG. 1 when the relevant snap temperature is reached. However, the locking member 5 still engages under the transmission member 4, so that the contacts 9, 11 are kept in the separate position even after the thermal bimetallic snap disk 3 has cooled.

Soll der thermische Schalter wieder in seine in Fig.1 dargestellte Ausgangslage gebracht werden, so muB beispielsweise mit Hilfe eines Werkzeuges das Sperrglied 5 vom Übertragungsglied 4 weggedrückt werden, so daß dieses unter der Kraft des federnden Kontaktträgers 10 in die in Fig.1 dargestellte Lage gebracht wird.If the thermal switch is to be returned to its initial position shown in FIG. 1, the locking element 5 must be pushed away from the transmission element 4, for example with the aid of a tool, so that it is moved into the position shown in FIG. 1 under the force of the resilient contact carrier 10 brought.

Bei dem in den Figuren 4 bis 6 dargestellten Ausführungsbeispiel sind die Bauteile, die den Bauteilen nach dem in den Figuren 1 bis 3 dargestellten Ausführungsbeispiel gleichen, mit den gleichen Bezugsziffern versehen.In the exemplary embodiment illustrated in FIGS. 4 to 6, the components which are the same as the components according to the exemplary embodiment illustrated in FIGS. 1 to 3 are provided with the same reference numbers.

Das Ausführungsbeispiel nach den Figuren 4 bis 6 unterscheidet sich von jenem nach den Figuren 1 bis-3 zunächst dadurch, daß das Sperrglied 5, wie dies die Figuren 4 bis 6 zeigen, in der Ausgangsstellung nicht gegen das Übertragungsglied 4, sondern gegen die Stirnfläche der Thermobimetallschnappscheibe 3 drückt. Das Übertragungsglied 4 ruht lediglich unter der Kraft des federnden Kontaktträgers 10 (Fig.1) auf der- Thermcbimetallschnappscheibe 3 auf.The embodiment of Figures 4 to 6 differs from that of Figures 1 to 3 first in that the locking member 5, as shown in Figures 4 to 6, not in the starting position against the transmission member 4, but against the end face of the Thermo bimetallic snap disk 3 presses. The transmission member 4 rests only on the thermal bimetallic snap disk 3 under the force of the resilient contact carrier 10 (FIG. 1).

Nach einer temperaturbedingten Verformung der Thermobimetallschnappscheibe 3 untergreift das Sperrglied 5 nicht unmitts bar das Übertragungsglied 4, wie dies beim Ausführungsbeispiel nach den Figuren 1 bis 3 der Fall ist, sondern die Thermobimetallschnappscheibe 3. Nach Temperaturrückgang verbleibt die Thermobimetallschnappscheibe 3 in der in Fig.5 dargestellten Lage, wobei sie allerdings jene Form einnimmt, wie sie in Fig.4 dargestellt ist.After a temperature-related deformation of the bimetallic snap disk 3, the blocking member 5 does not immediately engage under the transmission member 4, as is the case in the exemplary embodiment according to FIGS. 1 to 3, but the bimetallic snap disk 3. After the temperature has dropped, the bimetallic snap disk 3 remains in that shown in FIG Position, although it takes the form as shown in Fig.4.

Claims (4)

1. Thermischer Schalter mit einem aus einer Thermobimetallschnappscheibs gebildeten Temperaturfühler, der über ein Übertragungsglied mit einem Kontaktsystem zusammenwirkt, das einen mindestens einen beweglichen Kontakt tragenden bzw. bildenden Kontaktträger aufweist, wobei der bewegliche Kontakt unter Federkraft im Ruhezustand an mindestens eine festen Kontakt anliegt, und ein bei einer temperaturbedingten Bewegung des Übertragungsgliedes zumindest angenähert senkrecht zur Verstellrichtung desselben unter Federkraft in Richtung zum Übertragungsglied verstellbares Sperrglied vorgesehen ist, das den Kontaktträger nach einer temperaturbedingten Bewegung desselben in seiner Endstellung festhält, dadurch gekennzeichnet, daß die Angriffsstelle der Thermobimetallschnappscheibe (3) an dem Übertragungsglied (4) an dem dem Kontaktsystem abgewandten Ende des Übertragungsgliedes (4) liegt unc mit zwei Lagerstellen (12,13) der Thermobimetallsschnappscheihe (3) zumindest angenähert in einer parallel zur Verstellrichtung des Übertragungsgliedes (4) liegenden Ebene angeordnet ist, wobei die eine Lagerstelle (12) an dem der Angriffsstelle gegenüberliegenden Rand der Thermobimetallschnappscheibe (3) und die zweite Lagerstelle (13) zwischen der Angriffsstelle und der ersten Lagerstelle (12) liegt, und daß das Sperrglied (5) bei dem dem Kontaktsystem abgewandten Ende des Übertragungsgliedes (4) angeordnet ist.1.Thermal switch with a temperature sensor formed from a bimetallic snap disk, which interacts via a transmission member with a contact system which has at least one movable contact-bearing or forming contact carrier, the movable contact rests under spring force against at least one fixed contact, and an at least approximately perpendicular to the adjustment direction of the same under spring force in the direction of the transfer member locking member is provided at a temperature-related movement of the transfer member, which holds the contact carrier after a temperature-related movement of the same in its end position, characterized in that the point of attack of the bimetallic snap disk (3) on the Transfer member (4) at the end of the transfer member (4) facing away from the contact system is unc at least approximately in parallel with two bearing points (12, 13) of the thermo bimetallic snap disc (3) is arranged to the adjustment direction of the transmission member (4) lying level, the one bearing point (12) on the opposite edge of the bimetallic snap disk (3) and the second bearing point (13) between the point of attack and the first bearing point (12), and that the locking member (5) is arranged at the end of the transmission member (4) facing away from the contact system. 2. Thermischer Schalter nach Anspruch 1, dadurch gekennzeichnet, daß der Verstellweg der Angriffsstelle der Thermobimetallschnappscheibe (3) an dem dem Kontaktsystem abgewandten Ende des Übertragungsgliedes (4) größer ist als die Ausdehnung des die Sperre herbeiführenden Teiles des Sperrgliedes (5) parallel zur Längsrichtung des Übertragungsgliedes (4).2. Thermal switch according to claim 1, characterized in that the adjustment path of the point of attack of the bimetallic snap disk (3) at the end of the transmission member (4) facing away from the contact system is greater than the extent of the part of the locking member (5) which brings about the lock parallel to the longitudinal direction the transmission link (4). 3. Thermischer Schalter nach Anspruch 2, dadurch gekennzeichnet, daB das Sperrglied (5) in der sperrenden Stellung das Übertragungsglied (4) untergreift.3. Thermal switch according to claim 2, characterized in that the blocking member (5) engages under the transmission member (4) in the blocking position. 4. Thermischer Schalter nach Anspruch 2, dadurch gekennzeichnet, daß das Sperrglied (5) in der sperrenden Stellung die Thermobimetallschnappscheibe (3) untergreift.4. Thermal switch according to claim 2, characterized in that the locking member (5) in the locking position engages under the bimetallic snap disk (3).
EP83890027A 1982-03-03 1983-02-24 Thermostatic switch Expired EP0088747B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT831/82 1982-03-03
AT0083182A AT383696B (en) 1982-03-03 1982-03-03 THERMAL SWITCH

Publications (2)

Publication Number Publication Date
EP0088747A1 true EP0088747A1 (en) 1983-09-14
EP0088747B1 EP0088747B1 (en) 1986-08-20

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Family Applications (1)

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EP83890027A Expired EP0088747B1 (en) 1982-03-03 1983-02-24 Thermostatic switch

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US (1) US4554525A (en)
EP (1) EP0088747B1 (en)
AT (1) AT383696B (en)
DE (1) DE3365386D1 (en)

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AT386489B (en) * 1984-06-15 1988-08-25 Electrovac THERMAL SWITCH WITH A TEMPERATURE SENSOR MADE FROM A THERMAL BIMETALLIC SNAP DISC
GB9100186D0 (en) * 1991-01-04 1991-02-20 Otter Controls Ltd Improvements relating to thermally responsive electric switches
DE4321960A1 (en) * 1992-07-16 1994-01-20 Electrovac Thermal switch
US5986535A (en) * 1998-01-20 1999-11-16 Texas Instruments Incorporated Low cost thermostat apparatus and method for calibrating same
JPH11353992A (en) * 1998-04-07 1999-12-24 Yamada Electric Mfg Co Ltd Thermal protector
CN2552154Y (en) * 2002-06-11 2003-05-21 邵志成 Key-type temp controller with improved touch structure
US7071809B2 (en) * 2002-11-25 2006-07-04 Honeywell International Inc. Thermal fuse containing bimetallic sensing element
US7766006B1 (en) * 2007-03-09 2010-08-03 Coprecitec, S.L. Dual fuel vent free gas heater
CN102208302B (en) * 2010-03-31 2013-06-05 浙江家泰电器制造有限公司 Temperature control switch
CN107214201B (en) * 2017-07-27 2019-11-05 合肥东方节能科技股份有限公司 A kind of guide and guard deflector roll cooling system
DE102018100890B3 (en) * 2018-01-16 2019-07-18 Marcel P. HOFSAESS Temperature-dependent switch
DE102019112074B4 (en) * 2019-05-09 2020-12-17 Marcel P. HOFSAESS Temperature dependent switch
DE102019125452B4 (en) * 2019-09-20 2021-04-22 Marcel P. HOFSAESS Temperature dependent switch
DE102019125451B4 (en) * 2019-09-20 2021-04-08 Marcel P. HOFSAESS Temperature dependent switch
DE102019128367B4 (en) * 2019-10-21 2021-06-10 Marcel P. HOFSAESS TEMPERATURE DEPENDENT SWITCH

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Also Published As

Publication number Publication date
EP0088747B1 (en) 1986-08-20
ATA83182A (en) 1986-12-15
US4554525A (en) 1985-11-19
DE3365386D1 (en) 1986-09-25
AT383696B (en) 1987-08-10

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