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EP0058372A1 - Thermal switch with bimetallic element - Google Patents

Thermal switch with bimetallic element Download PDF

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Publication number
EP0058372A1
EP0058372A1 EP82100918A EP82100918A EP0058372A1 EP 0058372 A1 EP0058372 A1 EP 0058372A1 EP 82100918 A EP82100918 A EP 82100918A EP 82100918 A EP82100918 A EP 82100918A EP 0058372 A1 EP0058372 A1 EP 0058372A1
Authority
EP
European Patent Office
Prior art keywords
carrier
contact spring
temperature switch
switch according
lug
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82100918A
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German (de)
French (fr)
Inventor
Ag Limitor
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0058372A1 publication Critical patent/EP0058372A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01H37/5427—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting encapsulated in sealed miniaturised housing
    • 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
    • H01H2037/5481—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting the bimetallic snap element being mounted on the contact spring

Definitions

  • the invention relates to a bimetal temperature switch in miniature design with the features mentioned in the preamble of claim 1.
  • the two connecting lugs mostly sheet metal strips of a few tenths of a millimeter in thickness, are each fastened to the insulating plastic carrier by a hollow rivet.
  • the one connecting lug generally also represents the immovable contact piece
  • the contact spring with the movable contact piece attached to its free end is a separate component from its connecting lug, which is electrically conductively connected to the connecting lug. Since the contact spring must have special spring properties and, particularly in the case of a miniature construction, is of substantially thinner design than the connection lugs which are subjected to greater mechanical stress, the contact spring cannot simultaneously form the associated connection lug.
  • the contact spring is connected to its connecting lug simply by means of the hollow rivet with which the connecting lug is also fastened to the plastic carrier.
  • the contact spring and its connecting lug are placed one above the other and both are penetrated by the hollow rivet.
  • This type of fastening is not sufficiently strong, but it can happen that the rivet - triggered or 8 promotes through thermal expansion and deformation of the plastic carrier - loosens.
  • the result of this is poor contact between the contact spring and its associated terminal lug, which leads to an increased electrical contact resistance between the two.
  • the increased over qanos resistance in turn can lead to local overheating with temperatures that are above the switch-off temperature of the bimetal temperature switch.
  • the risk of overheating can turn a bimetal temperature switch as a means of limiting temperature into a means of increasing temperature, thereby transforming a safety device into a risk factor.
  • connection lugs can be quite varied. They can be designed as soldering lugs, screwable or rivetable lugs or also pluggable, for example provided with a pin-shaped connection end.
  • the two connecting lugs can be placed individually in an injection mold and then molded together. However, it is preferable to start with two connecting lugs which are initially connected in one piece and which are produced, for example, by a single stamping and shaping process in the predetermined angled shape.
  • the connecting lugs, which are still connected, can be adjusted particularly easily in the injection mold.
  • the necessary separation of the two connecting lugs is then carried out after the injection molding process, for example by means of a punching process.
  • the carrier is expediently provided in its central section - where the punching is to take place - at least with a reduced thickness or even with an opening. In any case, the carrier is provided with an opening after the punching process, which still has the advantage that for assembly and adjustment of the contact spring this is also easily accessible from the side facing the carrier (claim 7).
  • a snap disk is a bimetallic disk embossed into a curved shape, which abruptly changes its curvature from concave to convex or vice versa from convex to concave when the switching temperature is exceeded or fallen below.
  • Such a snap disk is usually held at its edge on the one hand between tabs which are cut out of the contact spring at the front and rear and bent up, while on the other hand on both sides next to the Contact spring two upstanding tabs are provided, which prevent the snap disk from slipping out of the side of the tabs cut out of the contact spring.
  • the side flaps can also be embedded in the carrier during the formation of the carrier by extrusion coating with the carrier material without an additional operation. But they can also be formed as extensions of the contact spring.
  • the bimetal temperature switch according to FIGS. 1-3 consists of a flat, elongated carrier 1 made of hard, electrically insulating plastic, in which two soldering lugs 2, 3 pointing in opposite directions are embedded at opposite ends.
  • the embedding is done because ß the solder lugs 2,3 are overmolded with the plastic of the carrier 1. This results in a positive connection between the carrier 1 and the solder lugs 2, 3, which is further reinforced by the fact that the solder lug sections embedded in the carrier 1 are angled several times.
  • solder lugs 2, 3, which are provided with soldering lugs 4, 5, are aligned with the underside 6 of the carrier 1
  • other parts 7, 8 of the soldering lugs 2, 3 are aligned with the upper side 9 of the carrier 1
  • the contact spring 10 is connected by spot welding to the soldering lug 2, specifically by two welding spots 13 lying symmetrically to the longitudinal axis of the switch.
  • the carrier 1 is provided with an opening 14 around the welding spots 13, die qleichzeitiq ensures that the carrier 1 is not inadmissibly heated during spot welding.
  • bimetallic snap disk 16 arranged on the outside of the contact spring 10.
  • the bimetal snap disc is i.w. Rectangular and is held on its two broad sides by the overlapping tabs 15, while the long sides of the bimetallic snap disk 16 aligned with the longitudinal edges of the contact spring 10 are held between two laterally raised tabs 17.
  • These lateral tabs 17 are extensions of the soldering lug 2, which extends beyond the welding points 13 towards the center of the carrier 1.
  • the bimetallic snap disk 16 shown convex in FIG. 2 changes its direction of curvature from convex to concave when the switching temperature is exceeded and, with its ends, rests under the tabs 15, while its middle part rests on one in the contact spring 10 embossed convex, is supported upward facing protrusion 18, and thereby the contact piece 11 from Ge q entrust Federation lifts 12th Below the contact spring 10 in the area around the bulge 18, the carrier 1 is provided with a further opening 19 which enables tools to access the contact spring 10 from below.
  • the corresponding opening 19 serves another purpose.
  • connecting lugs 2 and 3 which are initially connected in one piece, which are inserted as one piece into an injection mold and then encapsulated with plastic to form the carrier 1.
  • the initially connected connecting lugs 2 and 3 have the shape of a sheet metal strip from which the solder lugs 4 and 5 are punched out at the ends and from which two tabs between the solder lugs 4 and 5 are cut out, pointing to the solder lugs 4 and 5 immediately adjacent to them, and for formation of the solder tab parts 7 and 8 aligned with the top 9 of the carrier 1 are bent up in steps.
  • S p on both its subsequent opening 19 of the Träqers 1 the sheet metal strip having two lateral recesses provided in such a way that after the extrusion coating of the sheet metal strip, the two soldering lugs 2 and 3 are connected to one another only by a web crossing the opening 19 of the carrier 1.
  • a sheet metal strip shaped in this way can be produced from a flat sheet metal strip in only one operation.
  • the initially connected connecting lugs 2 and 3 are separated from one another in the area of the opening 19 of the carrier 1, most simply by punching out the web between the two connecting lugs 2 and 3.
  • the opening 19 is not necessarily from the beginning provided in the carrier 1, it can rather be formed by the same punching process by which the two connecting lugs 2 and 3 are separated from one another.
  • the carrier 1 is expediently shaped in such a way that it is at least reduced in thickness in the region of the later opening 19 before the punching process.
  • the advantage of this embodiment is that the connecting lugs in the injection mold can be adjusted more easily.
  • the opening 14 of the carrier 1 provided in the first embodiment is not provided in the second embodiment. Instead, the carrier 1 is kept very short and the connecting lug part 8, which is aligned with the upper side 9 of the carrier 1 and on which the contact spring 10 is fastened by two welding points 13, is above the outer edge of the carrier 1 and is located above the opening 20 of the terminal lug 2, from which the part 8 was cut out. In a corresponding manner, the terminal lug part 7 carrying the fixed contact 12 also rakes beyond the carrier 1.
  • the second exemplary embodiment differs from the first exemplary embodiment in a further feature, namely that, unlike in the first exemplary embodiment, the two tabs 17 are not designed as extensions of the connecting lug 2, but are part of the contact spring 10; the tabs 17 can be produced by leaving two lateral extensions when the contact spring 10 is punched out of the contact spring semi-finished product and then raising them.
  • the advantage of this measure is that the injection mold for the carrier 1 is easier.

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

Abstract

An open thermal switch with bimetallic element is described which can be produced particularly cost-effectively in that its two connecting tabs (2, 3), which produce the electrical connection with contact piece (11) on the moving end of the contact spring (10) on the one hand and with the fixed contact piece (12) on the other hand, are embedded in a positive locking manner in the electrically insulating carrier (1) of the switch, preferably injection moulded with plastic. <IMAGE>

Description

Die Erfindung geht aus von einem Bimetalltemperaturschalter in Miniaturbauweise mit den im Oberbegriff des Anspruchs 1 genannten Merkmalen. Bei den bekannten Bimetallschaltern dieser Art sind die beiden Anschlußfahnen, zumeist Blechstreifen von einigen Zehntel Millimetern Dicke, durch je einen Hohlniet auf dem isolierenden Kunststoffträger befestigt. Während die eine Anschlußfahne in der Regel zugleich das unbewegliche Kontaktstück darstellt, ist die Kontaktfeder mit dem an ihrem freien Ende befestigten beweglichen Kontaktstück ein von ihrer Anschlußfahne gesondertes Bauteil, welches mit der Anschlußfahne elektrisch leitend verbunden ist. Da die Kontaktfeder besondere Federeigenschaften haben muß und vor allem bei Miniaturbauweise wesentlich dünner ausgebildet ist als die mechanisch stärker beanspruchten Anschlußfahnen, kann die Kontaktfeder nicht zugleich die zugehörige Anschlußfahne bilden.The invention relates to a bimetal temperature switch in miniature design with the features mentioned in the preamble of claim 1. In the known bimetallic switches of this type, the two connecting lugs, mostly sheet metal strips of a few tenths of a millimeter in thickness, are each fastened to the insulating plastic carrier by a hollow rivet. While the one connecting lug generally also represents the immovable contact piece, the contact spring with the movable contact piece attached to its free end is a separate component from its connecting lug, which is electrically conductively connected to the connecting lug. Since the contact spring must have special spring properties and, particularly in the case of a miniature construction, is of substantially thinner design than the connection lugs which are subjected to greater mechanical stress, the contact spring cannot simultaneously form the associated connection lug.

Die Verbindung der Kontaktfeder mit ihrer Anschlußfahne erfolgt beim Stand der Technik einfach mittels des Hohlniets, mit welchem auch die Anschlußfahne am Kunststoffträger befestigt ist. Die Kontaktfeder und ihre Anschlußfahne sind übereinandergelegt und werden beide vom Hohlniet durchsetzt. Diese Art der Befestigung ist nicht hinreichend fest, vielmehr kann es vorkommen, daß der Niet sich - ausgelöst oder ge-8 fördert durch Wärmedehnung und Verformung des Kunststoffträgers - lockert. Die Folge davon ist ein mangelhafter Kontakt zwischen der Kontaktfeder und ihrer zugehörigen Anschlußfahne, der zu einem erhöhten elektrischen Übergangswiderstand zwischen beiden führt. Der erhöhte Überqanoswiderstand wiederum kann zu lokalen Überhitzungen mit Temperaturen führen, die über der Ausschalttemperatur des Bimetalltemperaturschalters liegen. Die Überhitzungsgefahr kann aus einem Bimetalltemperaturschalter als Mittel zur Temperaturbegrenzung geradezu ein Mittel zur Temperatursteigerunq machen und dadurch eine Sicherheitseinrichtung in einen Risikofaktor verwandeln. Um dem zu begegnen, ist es Stand der Technik, die Kontaktfeder und ihre zugehörige Anschlußfahne zusätzlich miteinander zu verschweißen, vorzugsweise mittels eines Laserstrahles. Das bedeutet jedoch einen zusätzlichen Arbeitsschritt, der die Herstellung des Miniaturschalters verteuert.In the prior art, the contact spring is connected to its connecting lug simply by means of the hollow rivet with which the connecting lug is also fastened to the plastic carrier. The contact spring and its connecting lug are placed one above the other and both are penetrated by the hollow rivet. This type of fastening is not sufficiently strong, but it can happen that the rivet - triggered or 8 promotes through thermal expansion and deformation of the plastic carrier - loosens. The result of this is poor contact between the contact spring and its associated terminal lug, which leads to an increased electrical contact resistance between the two. The increased over qanos resistance in turn can lead to local overheating with temperatures that are above the switch-off temperature of the bimetal temperature switch. The risk of overheating can turn a bimetal temperature switch as a means of limiting temperature into a means of increasing temperature, thereby transforming a safety device into a risk factor. In order to counter this, it is state of the art to additionally weld the contact spring and its associated connecting lug to one another, preferably by means of a laser beam. However, this means an additional step that increases the cost of manufacturing the miniature switch.

Es ist die Aufgabe der vorliegenden Erfindung, durch eine neue Raumform des Bimetalltemperaturschalters seine Herstellung in einer zur Massenproduktion geeigneten Weise zu vereinfachen, ohne seine Funktionssicherheit zu beeinträchtigen.It is the object of the present invention to simplify its manufacture in a manner suitable for mass production by a new spatial shape of the bimetal temperature switch without impairing its functional reliability.

Diese Aufgabe wird gelöst durch einen Bimetalltemperaturschalter mit den im Anspruch 1 angegebenen Merkmalen. Das formschlüssige Einbetten der Anschlußfahnen erfolgt in einem Arbeitsgang mit der Herstellung des Trägers, vorzugsweise nach dem Kunststoffspritzverfahren (Anspruch 6). Damit sind durch das ohnehin erforderliche Formen des Trägers zugleich auch die Anschlußfahnen fixiert, sodaß ein bzw. zwei sonst erforderliche Nietvorgänge entfallen. Die Anschlußfahnen können recht vielgestaltig sein. Sie können als Lötfahnen, verschraubbare oder vernietbare Fahnen oder auch steckbar, z.B. mit einem stiftförmigen Anschlußende versehen, ausgebildet sein.This object is achieved by a bimetal temperature switch with the features specified in claim 1. The form-fitting embedding of the connection lugs takes place in one operation with the Her position of the carrier, preferably by the plastic injection molding process (claim 6). This means that at the same time also fixes the terminal lugs by the already required shapes of the wearer so that one or two otherwise necessary Nietvor g omitted ength. The connection lugs can be quite varied. They can be designed as soldering lugs, screwable or rivetable lugs or also pluggable, for example provided with a pin-shaped connection end.

Die beiden Anschlußfahnen können einzeln in eine Spritzgießform eingelegt und dann gemeinsam umspritzt werden. Vorzugsweise geht man jedoch von zwei zunächst einstückig zusammenhängenden Anschlußfahnen aus, welche z.B. durch einen einzigen Stanz-und Formgebungsvorgang in der vorgegebenen abqewinkelten Gestalt erzeugt werden. Die noch zusammenhängenden Anschlußfahnen können besonders leicht in der Spritzgießform justiert werden. Die erforderliche Trennung der beiden Anschlußfahnen erfolgt dann nach dem Spritzgießvorgang z.B. durch einen Stanzvorqang. Zur Erleichterung des Stanzvorgangs ist zweckmäßigerweise der Träger in seinem mittleren Abschnitt - dort wo die Stanzung erfolgen soll - weniqstens mit verringerter Dicke oder sogar mit einer Durchbrechung versehen. Jedenfalls ist der Träger nach dem Stanzvorgang mit einer Durchbrechung versehen, die noch den Vorteil hat, daß zur Montage und Justierung der Kontaktfeder diese auch von der dem Träger zugewandten Seite gut zugänglich ist (Anspruch 7).The two connecting lugs can be placed individually in an injection mold and then molded together. However, it is preferable to start with two connecting lugs which are initially connected in one piece and which are produced, for example, by a single stamping and shaping process in the predetermined angled shape. The connecting lugs, which are still connected, can be adjusted particularly easily in the injection mold. The necessary separation of the two connecting lugs is then carried out after the injection molding process, for example by means of a punching process. To facilitate the punching process, the carrier is expediently provided in its central section - where the punching is to take place - at least with a reduced thickness or even with an opening. In any case, the carrier is provided with an opening after the punching process, which still has the advantage that for assembly and adjustment of the contact spring this is also easily accessible from the side facing the carrier (claim 7).

Zur Verbindung der Kontaktfeder mit ihrer Anschlußfahne ist dann nur noch ein Löt- oder Schweißvorgang erforderlich; vorzugsweise erfolgt die Verbindung durch Punktschweißen (Anspruch 8). Im Ergebnis erhäl-t man so einen Bimetalltemperaturschalter, bei dem Kontaktprobleme zwischen der Kontaktfeder und ihrer Anschlußfahne nicht auftreten und obendrein die Nietvorgänqe entfallen sind. Daraus ergibt sich ein Preisvorteil des neuen Schalters. Ein weiterer Vorteil ist darin zu sehen, daß bei der Auswahl des Trägerwerkstoffs und bei der räumlichen Gestaltung des Trägers keine Rücksicht mehr auf die Vernietbarkeit des Trägers genommen werden muß, sodaß die Wahlfreiheit des Konstrukteurs größer geworden ist.Then only a soldering or welding process is required to connect the contact spring to its connecting lug; the connection is preferably carried out by spot welding (claim 8). As a result, a bimetal temperature switch is obtained in which there are no contact problems between the contact spring and its connecting lug and, moreover, the riveting processes are eliminated. This results in a price advantage for the new switch. Another advantage can be seen in the fact that in the selection of the carrier material and in the spatial design of the carrier there is no longer any need to take into account the rivetability of the carrier, so that the designer's freedom of choice has increased.

Vorteile bietet die Erfindung auch bei solchen Bimetalltemperaturschaltern, deren Bimetallelement eine lose Schnappscheibe ist (Ansprüche 3 bis 5). Eine Schnappscheibe ist eine in eine gekrümmte Gestalt geprägte Bimetallscheibe, die bei Überschreiten oder Unterschreiten der Schalttemperatur abrupt ihre Krümmung von konkav nach konvex bzw. umgekehrt von konvex nach konkav wechselt. Eine solche Schnappscheibe wird an ihrem Rand üblicherweise zum einen zwischen Laschen, die vorn und hinten aus der Kontaktfeder ausgeschnitten und hochgebogen sind, gehalten, während zum andern beidseits neben der Kontaktfeder zwei hochstehende Laschen vorgesehen sind, die verhindern, daß die Schnappscheibe seitlich aus den aus der Kontaktfeder ausgeschnittenen Laschen herausrutscht. Die seitlichen Laschen können ebenfalls bereits bei der Bildung des Trägers durch Umspritzen mit dem Trägermaterial ohne einen zusätzlichen Arbeitsgang mit in den Träger eingebettet werden. Sie können aber auch als Fortsätze der Kontaktfeder Gebildet sein.The invention also offers advantages in the case of such bimetal temperature switches, the bimetal element of which is a loose snap disk (claims 3 to 5). A snap disk is a bimetallic disk embossed into a curved shape, which abruptly changes its curvature from concave to convex or vice versa from convex to concave when the switching temperature is exceeded or fallen below. Such a snap disk is usually held at its edge on the one hand between tabs which are cut out of the contact spring at the front and rear and bent up, while on the other hand on both sides next to the Contact spring two upstanding tabs are provided, which prevent the snap disk from slipping out of the side of the tabs cut out of the contact spring. The side flaps can also be embedded in the carrier during the formation of the carrier by extrusion coating with the carrier material without an additional operation. But they can also be formed as extensions of the contact spring.

Die Ausgestaltungen nach Anspruch 8 und 10 ermöglichen es, daß die Punktschweißelektroden einander unmittelbar gegenüberliegend auf die Kontaktfeder und ihre Anschlußfahne aufgesetzt werden können.The configurations according to claims 8 and 10 enable the spot welding electrodes to be placed directly opposite one another on the contact spring and its connecting lug.

Zwei Ausführungsbeispiele der Erfindunq sind in den beigefügten Zeichnungen schematisch dargestellt und werden nachfolgend beschrieben.

  • Figur 1 ist die Draufsicht eines Bimetalltemperaturschalters mit Schnappscheibe,
  • Figur 2 ist der Längsschnitt A-A gemäß Fig. 1 durch den Bimetalltemperaturschalter,
  • Figur 3 ist die Ansicht des Bimetalltemperaturschalters von unten,
  • . Figur 4 ist die Draufsicht eines anderen Bimetalltemperaturschalters mit Schnappscheibe,
  • Finur 5 ist der Längsschnitt B-B durch den Bimetalltemperaturschalter qemäß Figur 4 und
  • Fiqur 6 ist die Ansicht des Bimetalltemperaturschalters aus Fiqur 4 von unten.
Two embodiments of the invention are shown schematically in the accompanying drawings and are described below.
  • FIG. 1 is a top view of a bimetal temperature switch with a snap disk,
  • FIG. 2 is the longitudinal section AA according to FIG. 1 through the bimetal temperature switch,
  • FIG. 3 is the bottom view of the bimetal temperature switch,
  • . FIG. 4 is a top view of another bimetal temperature switch with a snap disk,
  • Finur 5 is the longitudinal section BB through the bimetal temperature switch qemäß 4 and
  • Fiqur 6 is the bottom view of the bimetal temperature switch from Fiqur 4.

Der Bimetalltemperaturschalter gemäß Figur 1-3 besteht aus einem flachen, länglichen Träger 1 aus hartem, elektrisch isolierendem Kunststoff, in den an gegenüberliegenden Enden zwei in entgeqengesetzte Richtungen weisenden Lötfahnen 2,3 eingebettet sind. Die Einbettung ist dadurch erfolgt, daß die Lötfahnen 2,3 mit dem Kunststoff des Träqers 1 umspritzt sind. Dadurch ergibt sich eine formschlüssige Verbindung zwischen dem Träger 1 und den Lötfahnen 2,3, die dadurch noch verstärkt wird, daß die im Träger 1 eingebetteten Lötfahnenabschnitte mehrfach abgewinkelt sind. Während die mit Lötösen 4,5 versehenen Enden der Lötfahnen 2,3 mit der Unterseite 6 des Trägers 1 fluchten, fluchten andere Teile 7,8 der Lötfahnen 2,3 mit der Oberseite 9 des Trägers 1, wobei am einen Teil 8 die Kontaktfeder 10 mit an der Spitze angenietetem Kontaktstück 11 und am anderen Teil 7 das unbewegliche Gegenkontaktstück 12 angenietet ist.The bimetal temperature switch according to FIGS. 1-3 consists of a flat, elongated carrier 1 made of hard, electrically insulating plastic, in which two soldering lugs 2, 3 pointing in opposite directions are embedded at opposite ends. The embedding is done because ß the solder lugs 2,3 are overmolded with the plastic of the carrier 1. This results in a positive connection between the carrier 1 and the solder lugs 2, 3, which is further reinforced by the fact that the solder lug sections embedded in the carrier 1 are angled several times. While the ends of the solder lugs 2, 3, which are provided with soldering lugs 4, 5, are aligned with the underside 6 of the carrier 1, other parts 7, 8 of the soldering lugs 2, 3 are aligned with the upper side 9 of the carrier 1, the contact spring 10 on one part 8 with the contact piece 11 riveted to the tip and the immovable counter-contact piece 12 riveted to the other part 7.

Die Kontaktfeder 10 ist durch Punktschweißen mit der Lötfahne 2 verbunden, und zwar durch zwei symmetrisch zur Längsachse des Schalters liegende Schweißpunkte 13. Um die Schweißelektroden beidseitig einander gegenüberliegend aufsetzen zu können, ist der Träger 1 um die Schweißpunkte 13 herum mit einer Durchbrechung 14 versehen, die qleichzeitiq sicherstellt, daß der Träger 1 beim Punktschweißen nicht unzulässig erwärmt wird.The contact spring 10 is connected by spot welding to the soldering lug 2, specifically by two welding spots 13 lying symmetrically to the longitudinal axis of the switch. In order to be able to place the welding electrodes opposite one another on both sides, the carrier 1 is provided with an opening 14 around the welding spots 13, die qleichzeitiq ensures that the carrier 1 is not inadmissibly heated during spot welding.

Aus der Kontaktfeder 10 sind zwei in Länqsrichtung weisende und aufeinander zu gerichtete Laschen 15 ausgeschnitten und hochgebogen, die zur Halterung einer außen auf der Kontaktfeder 10 angeordneten Bimetallschnappscheibe 16 dienen. Die Bimetallschnappscheibe ist i.w. rechteckig geformt und wird an ihren beiden Breitseiten durch die übergreifenden Laschen 15 gehalten, während die mit den Längskanten der Kontaktfeder 10 fluchtenden Längsseiten der Bimetallschnappscheibe 16 zwischen zwei seitlich hochstehenden Laschen 17 gehalten werden. Diese seitlichen Laschen 17 sind Fortsätze der über die Schweißpunkte 13 hinaus zur Mitte des Trägers 1 hin verlängerten Lötfahne 2.From the contact spring 10, two tabs 15 pointing in the longitudinal direction and facing each other are cut out and bent up, which serve to hold a bimetallic snap disk 16 arranged on the outside of the contact spring 10. The bimetal snap disc is i.w. Rectangular and is held on its two broad sides by the overlapping tabs 15, while the long sides of the bimetallic snap disk 16 aligned with the longitudinal edges of the contact spring 10 are held between two laterally raised tabs 17. These lateral tabs 17 are extensions of the soldering lug 2, which extends beyond the welding points 13 towards the center of the carrier 1.

Die in Figur 2 konvex gezeichnete Bimetallschnappscheibe 16 wechselt bei Überschreiten der Schalttemperatur ihre Krümmungsrichtung von konvex nach konkav und stemmt sich dabei mit ihren Enden unter die Laschen 15, während sie sich mit ihrem Mittelteil auf einer in die Kontaktfeder 10 eingeprägten balligen, nach oben weisenden Ausbuchtung 18 abstützt und dadurch das Kontaktstück 11 vom Geqenkontaktstück 12 abhebt. Unterhalb der Kontaktfeder 10 im Bereich um die Ausbuchtung 18 herum ist der Träger 1 mit einer weiteren Durchbrechung 19 versehen, die von unten her einen Zugriff mittels Werkzeugen zur Kontaktfeder 10 ermöglicht.The bimetallic snap disk 16 shown convex in FIG. 2 changes its direction of curvature from convex to concave when the switching temperature is exceeded and, with its ends, rests under the tabs 15, while its middle part rests on one in the contact spring 10 embossed convex, is supported upward facing protrusion 18, and thereby the contact piece 11 from Ge q enkontaktstück lifts 12th Below the contact spring 10 in the area around the bulge 18, the carrier 1 is provided with a further opening 19 which enables tools to access the contact spring 10 from below.

Im zweiten Ausführungsbeispiel gemäß Fig. 4-6, in denen für entsprechende Elemente dieselben Bezugszahlen wie im ersten Ausführungsbeispiel verwendet worden sind, dient die entsprechende Durchbrechung 19 noch einem anderen Zweck. Zur Herstellung des Schalters Gemäß Fig. 4-6 geht man nämlich von zunächst einstückig zusammenhängenden Anschlußfahnen 2 und 3 aus, welche als ein Stück in eine Spritzgießform eingelegt und dann zur Bildung des Trägers 1 mit Kunststoff umspritzt werden. Die zunächst zusammenhängenden Anschlußfahnen 2 und 3 haben die Gestalt eines Blechstreifens, aus dem an den Enden die Lötösen 4 und 5 ausgestanzt sind und aus dem zwischen den Lötösen 4 und 5 zwei zu den ihnen unmittelbar benachbarten Lötösen 4 und 5 weisende Laschen ausqeschnitten und zur Bildung der mit der Oberseite 9 des Trägers 1 fluchtenden Lötfahnenteile 7 und 8 stufenförmig hochgebogen sind. Beid- spits der späteren Durchbrechung 19 des Träqers 1 ist der Blechstreifen mit zwei seitlichen Ausnehmungen versehen derart, daß nach dem Umspritzen des Blechstreifens die beiden Lötfahnen 2 und 3 nur durch einen die Durchbrechung 19 des Trägers 1 durchquerenden Steg miteinander verbunden sind. Ein derart geformter Blechstreifen läßt sich in nur einem Arbeitsgang aus einem ebenen Blechstreifen herstellen. Nach dem Entformen des Trägers 1 werden im Bereich der Durchbrechung 19 des Trägers 1 die zunächst zusammenhängenden Anschlußfahnen 2 und 3 voneinander getrennt, und zwar am einfachsten durch Ausstanzen des Stegs zwischen den beiden Anschlußfahnen 2 und 3. Die Durchbrechung 19 ist nicht notwendigerweise von Anfang an im Träger 1 vorgesehen, sie kann vielmehr durch denselben Stanzvorgang, durcn welchen die beiden Anschlußfahnen 2 und 3 voneinander getrennt werden, gebildet werden. Zweckmäßigerweise ist aber der Träger 1 so geformt, daß er schon vor dem Stanzvorgang im Bereich der späteren Durchbrechung 19 wenigstens in verminderter Dicke ausgeführt ist. Der Vorteil dieser Ausführungsform liegt darin, daß die Anschlußfahnen in der Spritzgießform leichter justiert werden können.In the second exemplary embodiment according to FIGS. 4-6, in which the same reference numbers as in the first exemplary embodiment have been used for corresponding elements, the corresponding opening 19 serves another purpose. For the manufacture of the switch according to FIGS. 4-6, one starts with connecting lugs 2 and 3, which are initially connected in one piece, which are inserted as one piece into an injection mold and then encapsulated with plastic to form the carrier 1. The initially connected connecting lugs 2 and 3 have the shape of a sheet metal strip from which the solder lugs 4 and 5 are punched out at the ends and from which two tabs between the solder lugs 4 and 5 are cut out, pointing to the solder lugs 4 and 5 immediately adjacent to them, and for formation of the solder tab parts 7 and 8 aligned with the top 9 of the carrier 1 are bent up in steps. S p on both its subsequent opening 19 of the Träqers 1, the sheet metal strip having two lateral recesses provided in such a way that after the extrusion coating of the sheet metal strip, the two soldering lugs 2 and 3 are connected to one another only by a web crossing the opening 19 of the carrier 1. A sheet metal strip shaped in this way can be produced from a flat sheet metal strip in only one operation. After the carrier 1 has been removed from the mold, the initially connected connecting lugs 2 and 3 are separated from one another in the area of the opening 19 of the carrier 1, most simply by punching out the web between the two connecting lugs 2 and 3. The opening 19 is not necessarily from the beginning provided in the carrier 1, it can rather be formed by the same punching process by which the two connecting lugs 2 and 3 are separated from one another. However, the carrier 1 is expediently shaped in such a way that it is at least reduced in thickness in the region of the later opening 19 before the punching process. The advantage of this embodiment is that the connecting lugs in the injection mold can be adjusted more easily.

Die beim ersten Ausführungsbeispiel vorgesehene Durchbrechung 14 des Trägers 1 ist beim zweiten Ausführungsbeispiel nicht vorgesehen. Statt dessen ist der Träger 1 sehr kurz gehalten und der mit der Oberseite 9 des Trägers 1 fluchtende Anschlußfahnenteil 8, auf welchen durch zwei Schweißpunkte 13 die Kontaktfeder 10 befestigt ist, steht über den äußeren Rand des Trägers 1 über und befindet sich über der Öffnung 20 der Anschlußfahne 2, aus welcher das Teil 8 ausgeschnitten wurde. In entsprechender Weise raqt auch das den festen Kontakt 12 tragende Anschlußfahnenteil 7 über den Träger 1 hinaus.The opening 14 of the carrier 1 provided in the first embodiment is not provided in the second embodiment. Instead, the carrier 1 is kept very short and the connecting lug part 8, which is aligned with the upper side 9 of the carrier 1 and on which the contact spring 10 is fastened by two welding points 13, is above the outer edge of the carrier 1 and is located above the opening 20 of the terminal lug 2, from which the part 8 was cut out. In a corresponding manner, the terminal lug part 7 carrying the fixed contact 12 also rakes beyond the carrier 1.

Das zweite Ausführungsbeispiel unterscheidet sich vom ersten Ausführungsbeispiel noch in einem weiteren Merkmal, und zwar sind die beiden Laschen 17 anders als im ersten Ausführungsbeispiel nicht als Fortsätze der Anschlußfahne 2 ausgebildet, sondern sind Teil der Kontaktfeder 10; die Laschen 17 können dadurch hergestellt werden, daß man beim Ausstanzen der Kontaktfeder 10 aus dem Kontaktfederhalbzeug zwei seitliche Fortsätze stehen läßt und diese dann hochstellt. Der Vorteil dieser Maßnahme liegt darin, daß die Spritzgießform für den Träger 1 einfacher wird.The second exemplary embodiment differs from the first exemplary embodiment in a further feature, namely that, unlike in the first exemplary embodiment, the two tabs 17 are not designed as extensions of the connecting lug 2, but are part of the contact spring 10; the tabs 17 can be produced by leaving two lateral extensions when the contact spring 10 is punched out of the contact spring semi-finished product and then raising them. The advantage of this measure is that the injection mold for the carrier 1 is easier.

Claims (10)

1. Bimetalltemperaturschalter, bei dem das unbewegliche Kontaktstück mit der ihm zugehörigen Anschlußfahne einerseits und die Kontaktfeder samt der ihr zugehörigen Anschlußfahne andererseits elektrisch voneinander isoliert an einem einstückigen Träger aus Kunststoff befestigt sind, wobei die Kontaktfeder an ihrem freien Ende ein Kontaktstück (das "bewegliche" Kontaktstück) trägt, welches bei geschlossenem Schalter am unbeweglichen Kontaktstück anliegt, und an ihrem anderen Ende mit der zugehörigen Anschlußfahne verlötet oder verschweißt ist, dadurch gekennzeichnet, daß wenigstens die der Kontaktfeder (10) zugehörige Anschlußfahne (2) formschlüssig in dem Träger (1) eingebettet ist.1. Bimetal temperature switch, in which the immovable contact piece with the associated lug on the one hand and the contact spring together with the associated lug on the other hand are electrically insulated from one another on a one-piece carrier made of plastic, the contact spring at its free end a contact piece (the "movable" Contact piece), which rests on the immovable contact piece when the switch is closed, and is soldered or welded to the associated connecting lug at its other end, characterized in that at least the connecting lug (2) associated with the contact spring (10) is positively inserted in the carrier (1). is embedded. 2. Bimetalltemperaturschalter nach Anspruch 1, dadurch gekennzeichnet, daß beide Anschluß- . fahnen (2,3) formschlüssiq in den Träger (1) eingebettet sind.2. Bimetal temperature switch according to claim 1, characterized in that both connection. f a hnen (2,3) formschlüssiq in the carrier (1) are embedded. 3. Bimetalltemperaturschalter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als Bimetallelement eine Schnappscheibe (16) vorgesehen ist, welche an ihrem vorderen und hinteren Rand mittels der Kontaktfeder (10) angeformten Laschen (15), Haken oder dergl. Halterungen und an ihren seitlichen Rändern durch zwei vom Träger (1) hochstehende und formschlüssig in den Träger (1) eingebettete seitliche Halterunqen (17) lose auf der Oberseite oder auf der Unterseite der Kontaktfeder (10) gehalten ist.3. Bimetallic temperature switch according to claim 1 or 2, characterized in that a snap disc (16) is provided as the bimetallic element, which on its front and rear edge by means of the contact spring (10) integrally formed tabs (15), hooks or the like side edges by two from the carrier (1) high standing and form-fittingly embedded in the carrier (1) lateral support units (17) is loosely held on the top or on the bottom of the contact spring (10). 4. Bimetalltemperaturschalter nach Anspruch 3, . dadurch gekennzeichnet, daß die seitlichen Halterungen (17) integraler Bestandteil der Anschlußfahne (2) sind, welche zur Kontaktfeder (10) gehört.4. Bimetal temperature switch according to claim 3,. characterized in that the lateral brackets (17) are an integral part of the connecting lug (2) which belongs to the contact spring (10). 5. Bimetalltemperaturschalter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als Bimetallelement eine Schnappscheibe (16) vorgesehen ist, welche an ihren Rändern mittels einer vorderen, einer hinteren und zweier seitlicher, der Kontaktfeder (10) angeformten Laschen (15, 17), Haken oder dergl. Halterungen lose auf der Oberseite oder auf der Unterseite der Kontaktfeder (10) gehalten ist.5. Bimetal temperature switch according to claim 1 or 2, characterized in that a snap disk (16) is provided as the bimetal element, which is formed on its edges by means of a front, a rear and two lateral, the contact spring (10) tabs (15, 17), Hooks or the like. Holders are held loosely on the top or on the bottom of the contact spring (10). 6. Bimetalltemperaturschalter nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Anschlußfahnen (2,3) und ggfs. die seitlichen Halterungen (17) durch Umspritzen mit dem Trägermaterial im Träger (1) eingebettet sind.6. Bimetallic temperature switch according to one of the preceding claims, characterized in that the connecting lugs (2, 3) and, if appropriate. The lateral brackets (17) are embedded in the carrier (1) by extrusion coating with the carrier material. 7. Bimptalltemperaturschalter nach Anspruch 6, dadurch gekennzeichnet, daß der Träger (1) zur räumlichen Trennung der beiden Anschlußfahnen (2,3) mit einer in seinem mittleren Abschnitt gelegenen Durchbrechung (19) versehen ist.7. Bim p tall temperature switch according to claim 6, characterized in that the carrier (1) for spatial separation of the two connecting lugs (2,3) is provided with an opening (19) located in its central section. 8. Bimetalltemperaturschalter nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Kontaktfeder (10) und ihre zugehörige Anschlußfahne (2) durch elektrische Punktschweißung miteinander verbunden sind.8. Bimetal temperature switch according to one of the preceding claims, characterized in that the contact spring (10) and its associated terminal lug (2) are connected to one another by electrical spot welding. 9. Bimetalltemperaturschalter nach Anspruch 8, dadurch gekennzeichnet, daß der Träger (1) im Bereich des bzw. der Schweißpunkte (13) durchbrochen ist.9. bimetal temperature switch according to claim 8, characterized in that the carrier (1) in the region of the or the welding points (13) is broken. 10. Bimetalltemperaturschalter nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das die Kontaktfeder (10) tragende Teil (8) der einen Anschlußfahne (2) aus dieser Anschlußfahne (2) ausgeschnitten, stufenförmig hochgestellt und mit seinem zum Anschlußende (4) der Anschlußfahne (2) weisenden Ende über den Rand des Trägers (1) frei hinausragt.10. Bimetal temperature switch according to one of claims 1 to 8, characterized in that the contact spring (10) carrying part (8) of a terminal lug (2) from this terminal lug (2) cut out, stepped up and with its to the terminal end (4) the connecting lug (2) pointing end protrudes freely over the edge of the carrier (1).
EP82100918A 1981-02-11 1982-02-09 Thermal switch with bimetallic element Withdrawn EP0058372A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813104827 DE3104827A1 (en) 1981-02-11 1981-02-11 "BIMETAL TEMPERATURE SWITCH"
DE3104827 1981-02-11

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EP0058372A1 true EP0058372A1 (en) 1982-08-25

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DE (1) DE3104827A1 (en)

Cited By (9)

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EP0069861A3 (en) * 1981-07-15 1984-10-17 INTER CONTROL Hermann Köhler Elektrik GmbH u. Co. KG Thermostat for electrically heated apparatuses
EP0181573A3 (en) * 1984-11-06 1987-06-16 Inter Control Hermann Kohler Elektrik Gmbh U. Co. Kg Temperature switch, particularly thermal release
EP0313674A1 (en) * 1987-10-27 1989-05-03 Temtech-Temperatur-Technik Hans Peter Bojer Thermal bimetallic switch
EP0290199A3 (en) * 1987-04-30 1990-08-01 Texas Instruments Incorporated Circuit interrupter device and method for making
GB2290169A (en) * 1994-06-10 1995-12-13 Uchiya Thermostat Double safety thermostat
WO1996036981A1 (en) * 1995-05-15 1996-11-21 Inter Control Hermann Köhler Elektrik GmbH & Co. KG Electric switchgear
US6515571B2 (en) * 2000-04-17 2003-02-04 Uchiya Thermostat Co., Ltd. Thermal protector
CN101288142B (en) * 2005-10-14 2010-12-01 打矢恒温器株式会社 Temperature switch
GB2481263A (en) * 2010-06-17 2011-12-21 Otter Controls Ltd Terminal for a thermally responsive electric switch

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DE8303325U1 (en) * 1983-02-08 1983-08-11 Zell, Manfred, 7530 Pforzheim Bimetal switch
DE3703826A1 (en) * 1987-02-07 1988-08-18 Limitor Ag Electrical thermal bimetallic switch
ES2005863A6 (en) * 1987-04-01 1989-04-01 Martinez Martinez Remedios Electrothermal protection device
GB9100186D0 (en) * 1991-01-04 1991-02-20 Otter Controls Ltd Improvements relating to thermally responsive electric switches
DE19501231C2 (en) * 1995-01-17 1998-01-29 Inter Control Koehler Hermann Thermally operable device with bimetal element
WO2016174794A1 (en) 2015-04-28 2016-11-03 ウチヤ・サーモスタット株式会社 Thermal protector
CN113770499B (en) * 2021-09-29 2025-04-04 苏州聚天合科技有限公司 A welding jig for resistance welding

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GB903807A (en) * 1960-04-04 1962-08-22 Eric Hardman Taylor Improvements in or relating to thermosensitive switches
DE1924701A1 (en) * 1968-05-15 1969-11-27 Otter Controls Ltd Thermally responsive snap switch
DE2052935A1 (en) * 1969-12-09 1971-07-15 Electrovac Thermal switch and process for its manufacture
GB1420218A (en) * 1972-04-15 1976-01-07 Lucas Electrical Co Ltd Electric switch
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Cited By (12)

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Publication number Priority date Publication date Assignee Title
EP0069861A3 (en) * 1981-07-15 1984-10-17 INTER CONTROL Hermann Köhler Elektrik GmbH u. Co. KG Thermostat for electrically heated apparatuses
EP0181573A3 (en) * 1984-11-06 1987-06-16 Inter Control Hermann Kohler Elektrik Gmbh U. Co. Kg Temperature switch, particularly thermal release
EP0290199A3 (en) * 1987-04-30 1990-08-01 Texas Instruments Incorporated Circuit interrupter device and method for making
EP0313674A1 (en) * 1987-10-27 1989-05-03 Temtech-Temperatur-Technik Hans Peter Bojer Thermal bimetallic switch
GB2290169A (en) * 1994-06-10 1995-12-13 Uchiya Thermostat Double safety thermostat
US5659285A (en) * 1994-06-10 1997-08-19 Uchiya Thermostat Co. Double safety thermostat having movable contacts disposed in both ends of a resilient plate
GB2290169B (en) * 1994-06-10 1998-12-09 Uchiya Thermostat Double safety thermostat
WO1996036981A1 (en) * 1995-05-15 1996-11-21 Inter Control Hermann Köhler Elektrik GmbH & Co. KG Electric switchgear
US6515571B2 (en) * 2000-04-17 2003-02-04 Uchiya Thermostat Co., Ltd. Thermal protector
CN101288142B (en) * 2005-10-14 2010-12-01 打矢恒温器株式会社 Temperature switch
GB2481263A (en) * 2010-06-17 2011-12-21 Otter Controls Ltd Terminal for a thermally responsive electric switch
GB2481263B (en) * 2010-06-17 2017-03-01 Otter Controls Ltd Thermally responsive electric switches

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DE3104827A1 (en) 1982-08-19
DE3104827C2 (en) 1991-09-12

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