EP0194512B1 - Electrical heater for a bimetal, in particular for an electrical power regulator - Google Patents

Electrical heater for a bimetal, in particular for an electrical power regulator Download PDF

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Publication number
EP0194512B1
EP0194512B1 EP86102502A EP86102502A EP0194512B1 EP 0194512 B1 EP0194512 B1 EP 0194512B1 EP 86102502 A EP86102502 A EP 86102502A EP 86102502 A EP86102502 A EP 86102502A EP 0194512 B1 EP0194512 B1 EP 0194512B1
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EP
European Patent Office
Prior art keywords
bimetal
support
power control
heating system
control device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86102502A
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German (de)
French (fr)
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EP0194512A3 (en
EP0194512B2 (en
EP0194512A2 (en
Inventor
Willi Essig
Siegfried Mannuss
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Ego Elektrogeraete AG
Original Assignee
Ego Elektrogeraete AG
EGO Elektro Geraete AG
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Application filed by Ego Elektrogeraete AG, EGO Elektro Geraete AG filed Critical Ego Elektrogeraete AG
Priority to AT86102502T priority Critical patent/ATE75344T1/en
Publication of EP0194512A2 publication Critical patent/EP0194512A2/en
Publication of EP0194512A3 publication Critical patent/EP0194512A3/en
Publication of EP0194512B1 publication Critical patent/EP0194512B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H61/00—Electrothermal relays
    • H01H61/02—Electrothermal relays wherein the thermally-sensitive member is heated indirectly, e.g. resistively, inductively
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H89/00—Combinations of two or more different basic types of electric switches, relays, selectors and emergency protective devices, not covered by any single one of the other main groups of this subclass
    • H01H89/04—Combination of a thermally actuated switch with a manually operated switch

Definitions

  • the invention relates to an electrical heater for a bimetal, in particular for an electrical power control device, according to the preamble of claim 1.
  • An electrical power control device which is provided for electric heating devices and which supplies the power to the consumer in individual power pulses of different relative duty cycles has become known from DE-C-26 25 716. It has a bimetal in the form of an angle lever, which acts at one end on an electrical snap switch and on its longer bimetal working leg, which is arranged transversely to the snap switch, an electrical heating winding is wound with the interposition of insulating plates.
  • the electrical heating winding must consist of very thin wire when the control heating is connected in parallel with the consumer, because its attachment and contacting is a critical point in the manufacture and operation, because it should only consume very little power.
  • the bimetal working leg is supported on one side by an adjusting screw on the housing and acts on the switch pressure at its other end via an axis of rotation and the short bimetal leg.
  • the switch itself is pivotally mounted and can be pivoted from an adjustment curve under the action of an adjusting lever designed as a compensation bimetal.
  • GB-A-1 515 356 describes a bimetal heater according to the preamble of claim 1. While one side of the carrier is pressed against the bimetal by a spring bolt, the other side is contacted by a bow spring and pressed at the same time.
  • DE-U-7 327 063 shows a heating element which is contacted and fixed on both sides with a plate-like support by plug-in shoes which are fixed by bending tabs on a bimetal.
  • the object of the invention is to provide an electric heater for a bimetal and thus an improved power control device, which are simple in construction and have improved operational reliability and quick response even in the lower temperature range.
  • the carrier should also preferably be arranged on the side of the bimetal with the material with a greater coefficient of expansion and the bimetal can preferably be largely straight at room temperature in the region covered by the carrier. As a result, the bimetal bends away from the ceramic carrier, but is at a very short distance from it at the beginning of the heating.
  • the clip can be a preferably pocket-shaped spring material part fastened to the bimetal, which in particular has lateral guide edges.
  • the carrier can therefore simply be pushed into this pocket during assembly and is thus automatically contacted on one side.
  • the resistance layer can be contacted by a contact spring with a transmission contact.
  • This relatively light and thin contact spring yields slightly to the movements of the bimetal and thus the carrier and is sufficient to transmit the low heating current of the bimetal.
  • the contact spring can be shaped into a preferably oval cylinder and fixed in at least one corresponding opening in a housing. This creates a non-rotatable axis that fixes the contact spring in the desired position on the housing.
  • the free end of the bimetal which is preferably curved, can act directly on the actuation point of a snap switch. This eliminates the need for transmission levers or the like.
  • a snap switch can be used, the snap spring of which is attached to a flexible spring support and which is actuated by bending the spring support relative to a spring tongue supported on a fixed part.
  • the bimetal forms one leg of an angle lever which is pivotably mounted near its break point and on the other leg of which an adjustment curve acts.
  • This leg of the angle lever can consist of two approximately parallel strips, one of which is formed by a compensation bimetal and preferably located on the other strip supported by an adjusting screw. This creates a jointly swiveling working bimetal / compensation bimetal unit that only needs one swivel bearing for all movements acting on the snap switch (working travel of the bimetal, compensation travel and adjustment travel of the setting curve).
  • a helical spring advantageously presses this angle lever against the adjustment curve.
  • it can be arranged on a preferably bolt-shaped guide part which, during assembly, can be snapped behind a housing shoulder, preferably a housing slot, with a tensioned coil spring deflected from its central axis and can be disengaged when the angle lever is actuated.
  • the tensioned coil spring is thus fixed in the slot by means of the bolt.
  • the power control device can contain switch-off and / or signal contact springs which run approximately parallel to one another, one of the contact springs in the "off" state of the power control device being in a depression in a switching curve and preferably via an insulating contact piece to another (or more) of the contact springs acts.
  • this enables space-saving attachment of the contacts which are used for signal contact or double-pole disconnection and are manually operated when the power control device is switched on, and on the other hand the contacts are in the "off” state, i.e. by far the majority of the time, in an unloaded state and thus cannot tire.
  • the power control device 11 shown has a housing 12, which consists of a housing base plate 13 and a housing cover 14. They consist of thermosetting plastic material and can be screwed together at two corners with screws 15.
  • An adjusting shaft 16 is supported in both housing parts and carries an adjusting curve 17 and a switching curve 18.
  • An angular lever 20 is pivotally mounted about a pivot axis 19 in a housing corner and bears a working bimetal 22 and a compensation bimetal 23, which are riveted to the axle carrier 21, on a U-shaped axle support 21 offset in the longitudinal direction of the axis.
  • the working bimetal 22 first extends essentially straight approximately parallel to one side of the housing and is then bent in the shape of an arc in the direction of the center of the housing.
  • the snap switch 31 is arranged approximately parallel to the main extent of the working bimetal 22 between the latter and the setting shaft 16 or the switching curve 18 arranged thereon.
  • the normally open contact 29 cooperates with a fixed mating contact 32, which, like the other switch connections, is connected through the housing base plate to terminal tabs 33 which extend from the rear of the switch, i.e. protrude vertically from the outside of the housing base plate 13.
  • Other types of snap-action switches can also be used, which also allow switching contacts to be provided if desired.
  • a clip 35 made of spring material is attached by spot welding.
  • the clip forms a pocket on the surface of the bimetal facing the housing, which consists of the material with a larger expansion coefficient, into which one end of a carrier 36 can be inserted, which consists of a sheet or strip of electrically insulating ceramic material, which has good thermal conductivity properties Has.
  • the carrier carries on its side facing away from the bimetal an electrical resistance layer 37 in the form of a layer running along the carrier Strip, which is indicated in Figures 1 and 4 as a dashed line.
  • the resistance layer 37 can consist of thick-film resistors known per se, for example based on bismuth or Ru 2 0 7 .
  • the carrier can consist of A1 2 0 3 .
  • the pocket 39 formed by the clamp 35 extends over the entire width of the working bimetal 22 and the approximately equally wide carrier 36 and has lateral angled portions 40 which guide the carrier 36. Two wart-shaped features 41 in the clamp 35 press on one of the contact surfaces 38 and thus ensure a secure hold and good contact.
  • the carrier is held at its root in contact with the bimetal 22 and, after an offset 34 in the bimetal, at a small distance parallel to it, at least at room temperature, if the bimetal runs essentially straight in this area.
  • the bimetal bends away from the carrier, but then also receives sufficient radiant heat at the higher temperatures, so that there is still sufficient heat transfer. It is essential, however, that the good contact results in a quick response in the lower temperature range.
  • the other end of the carrier 36 is contacted by a thin contact spring 42 which rests on a contact surface 38 with laterally bent ends.
  • the material of the contact spring is widened at the fixed end and rolled into an oval cylinder 43, which lies in corresponding recesses in the housing parts 13, 14 and positions the contact spring.
  • the power is supplied via a welded wire 44 from a connecting tongue.
  • the contact spring therefore forms a connection which moves with the end of the carrier and which keeps its contact surface itself clean due to this movement.
  • the compensation bimetal 23 initially runs approximately at right angles to the working bimetal 22 and then bends slightly towards the center of the switch.
  • a spring plate strip 45 is attached parallel to it in the area of the axle carrier 21 and has a V-shaped bend 46 into which an adjusting screw 47 screwed into the free end of the compensation bimetal engages.
  • the adjusting screw 47 allows the compensation bimetal 23 and the strip 45 to be adjusted in their spacing from one another for adjusting the power control device.
  • a head 48 of a bolt 49 presses, which protrudes diagonally from a housing corner and carries a coil spring 50 on its shaft, which contacts the leg 51 of the bell crank 20 formed from compensation bimetal 23 and strip 45 with the bend 46 presses with the setting curve 17.
  • the setting curve has a spiral outer surface 52, which ends in its section with the largest radius in a projecting cam 53, which contains a detent recess in which the configuration 46 shown in FIG. 1 shows the power control device in the "off" state 11 lies.
  • a recess 54 At the end of the curve with the smallest radius there is a recess 54 which ensures reliable control of the maximum power (100% relative duty cycle).
  • the coil spring 50 Since the coil spring 50 is supported at one end in the cover part 14, but the assembly is based on the housing base plate 13, the coil spring itself would have to be preloaded with a special mounting device. This is advantageously avoided by, as shown in FIG. 6, a slot 56 being provided in the housing cover 14, into which the head 48 of the bolt 49 can be pressed during the preassembly.
  • the coil spring 50 bends somewhat from its straight position, since it is fixed at one end in a housing recess 57 and thus jams in a tensioned position.
  • the free end of the strip 45 presses against the head 48 for the first time when the setting curve is pivoted into the position shown in FIG. 1, the head 48 is released from its clamped position and automatically jumps into it under the action of the coil spring in Figure 6 dashed working position. It is positioned by a bend 58 of the strip 45.
  • two contact springs 60 and 61 are provided in the housing, which bear at their free ends contacts which are provided for signal contact or for switching off the second pole of the household power supply.
  • the self-resilient contact springs are attached on one side to holders inserted into the housing and integral with the flat tabs.
  • the contact spring 60 running close to the setting shaft has a bend 62 which runs on the switching curve 18 and, in the illustrated "off" state of the power control device 11, lies in a corresponding recess in the switching curve 18, is thereby relaxed and the contacts of both contact springs 60, 61 open Has.
  • the contact spring 61 for signal contact, i.e. the indication of whether the power control device is switched on is actuated by an insulating pressure piece 64 which is fastened to the contact spring 60.
  • the switching curve 18 has, apart from the depression, a concentric outer surface.
  • the mode of operation corresponds to that of a power control unit. If, when switched on by turning the setting shaft in FIG. 1 in a clockwise direction, the bend 46 comes out of the catch, whereby the user has to overcome resistance, the angle lever pivots counterclockwise to the desired setting value, as a result of which the working bimetal 22 has its free end 24 the snap spring support 30, which presses against it, gives space for pivoting counterclockwise. As a result, the snap switch 31 closes the previously opened contacts 29, 32 when the snap spring 26 is snapped and a connected consumer receives current as does the resistance layer 37, which is connected in parallel with the consumer, i.e. is operated with the full mains voltage.
  • the reaction time can easily be determined by the thickness and coupling of the carrier 36.
  • the compensation bimetal 23 bends and compensates for the ambient temperature.
  • the bimetallic heater described is particularly well suited for a power control device, but can also be used for other devices in which an advantageous heating of a bimetallic or similar part is important, e.g. in thermal time switches.
  • the position and size of the bend 34 of the working bimetal 22 can be used to determine the desired degree of thermal coupling of the heating to the bimetal, for example in order to vary the switching frequency. Carrier and bimetal could also be in contact with one another over most of the heating area.

Abstract

A power control includes a thick film resistor on an electrically insulating support plate, for heating a bimetal strip operating switch contacts connecting power to a load, and to the resistor. The support plate is secured and the resistor thereon is electrically contacted by means of a resilient clip at one end, in the vicinity of a fixed end of the bimetal strip. An opposite end of the support is connected to a power source via a movable contact spring. An opposite free end of the bimetal strip acts directly on the switch contacts to disconnect power upon bending of the bimetal strip with heat. The bimetal strip and a control operator for biasing the bimetal strip are shaped like an L, with two legs pivotable around a pin adjacent the base of the bimetal strip.

Description

Die Erfindung betrifft eine elektrische Beheizung für ein Bimetall, insbesondere für ein elektrisches Leistungssteuergerät, nach dem Oberbegriff des Anspruchs 1.The invention relates to an electrical heater for a bimetal, in particular for an electrical power control device, according to the preamble of claim 1.

Ein elektrisches Leistungssteuergerät, das für Elektrowärmegeräte vorgesehen ist und dem Verbraucher die Leistung in einzelnen Leistungsimpulsen unterschiedlicher relativer Einschaltdauer zuführt, ist aus der DE-C-26 25 716 bekannt geworden. Es hat ein in Form eines Winkelhebels ausgebildetes Bimetall, das mit einem Ende auf einen elektrischen Schnappschalter einwirkt und auf dessen längeren und quer zum Schnappschalter angeordneten Bimetall-Arbeitsschenkel eine elektrische Heizwicklung unter Zwischenschaltung von Isolierplättchen gewickelt ist. Die elektrische Heizwicklung muß, weil sie nur sehr geringe Leistungen aufnehmen soll, bei parallel zum Verbraucher geschalteter Steuerbeheizung aus sehr dünnem Draht bestehen, dessen Anbringung und Kontaktierung ein kritischer Punkt bei der Herstellung und im Betrieb ist. Der Bimetall-Arbeitsschenkel ist auf der einen Seite über eine Justierschraube am Gehäuse abgestützt und wirkt an seinem anderen Ende über eine Drehachse und den kurzen Bimetall-Schenkel auf den Schalterdruck ein. Der Schalter selbst ist schwenkbar gelagert und kann unter der Wirkung eines als Kompensationsbimetall ausgebildeten Stellhebels von einer Einstellkurve aus verschwenkt werden.An electrical power control device which is provided for electric heating devices and which supplies the power to the consumer in individual power pulses of different relative duty cycles has become known from DE-C-26 25 716. It has a bimetal in the form of an angle lever, which acts at one end on an electrical snap switch and on its longer bimetal working leg, which is arranged transversely to the snap switch, an electrical heating winding is wound with the interposition of insulating plates. The electrical heating winding must consist of very thin wire when the control heating is connected in parallel with the consumer, because its attachment and contacting is a critical point in the manufacture and operation, because it should only consume very little power. The bimetal working leg is supported on one side by an adjusting screw on the housing and acts on the switch pressure at its other end via an axis of rotation and the short bimetal leg. The switch itself is pivotally mounted and can be pivoted from an adjustment curve under the action of an adjusting lever designed as a compensation bimetal.

Die GB-A-1 515 356 beschreibt eine BimetallBeheizung nach dem Oberbegriff des Anspruchs 1. Während eine Seite des Trägers durch einen Federbolzen an das Bimetall angedrückt ist, wird die andere Seite durch eine Bügelfeder kontaktiert und gleichzeitig angedrückt.GB-A-1 515 356 describes a bimetal heater according to the preamble of claim 1. While one side of the carrier is pressed against the bimetal by a spring bolt, the other side is contacted by a bow spring and pressed at the same time.

Das DE-U-7 327 063 zeigt ein Heizelement, das mit einem plattenartigen Träger beidseitig durch Steckschuhe kontaktiert und festgelegt ist, die durch Umbiegen von Laschen auf einem Bimetall festgelegt werden.DE-U-7 327 063 shows a heating element which is contacted and fixed on both sides with a plate-like support by plug-in shoes which are fixed by bending tabs on a bimetal.

Aufgabe der Erfindung ist es, eine elektrische Beheizung für ein Bimetall und damit ein verbessertes Leistungssteuergerät zu schaffen, die einfach aufgebaut sind und eine verbesserte Betriebssicherheit, sowie ein schnelles Ansprechen auch im unteren Temperaturbereich haben.The object of the invention is to provide an electric heater for a bimetal and thus an improved power control device, which are simple in construction and have improved operational reliability and quick response even in the lower temperature range.

Diese Aufgabe wird gemäß der Erfindung durch den Anspruch 1 gelöst. Es ergibt sich eine sogenannte Wurzelbeheizung des Bimetalls, d. h. das Bimetall wird in dem Bereich am stärksten beheizt, das seinem freien, auf den Schalter einwirkende Ende entgegengesetzt ist, so daß sich durch Hebelwirkung eine besonders kräftige Auslenkung ergibt. Nahe einem Ende des Bimetalls kann ein elektrisch isolierender Träger mit einer darauf angeordneten elektrischen Widerstandsschicht durch eine Klammer festgelegt und einseitig elektrisch kontaktiert sein. Der Träger kann ein elektrisch isolierendes, aber relativ gut wärmeleitendes Keramikplättchen sein, auf dem die Widerstandsschicht, beispielsweise in Form eines sog. Dickschichtwiederstandes, aufgebracht ist. Auf dem Träger können sich an beide Enden der Widerstandsschicht auf dem Träger angebrachte Kontaktflächen anschließen, über die die Kontaktierung erfolgt. Der Träger sollte auch vorzugsweise auf der Seite des Bimetalls mit dem Material größeren Ausdehnungskoifizientens angeordnet sein und das Bimetall kann vorzugsweise bei Raumtemperatur in dem vom Träger überdeckten Bereich größtenteils gerade sein. Dadurch biegt sich das Bimetall von dem Keramikträger hinweg, ist aber am Beginn der Beheizung in sehr geringem Abstand von diesem.This object is achieved according to the invention by claim 1. There is a so-called root heating of the bimetal, i. H. the bimetal is most strongly heated in the area which is opposite its free end, which acts on the switch, so that a particularly strong deflection results from lever action. Near one end of the bimetal, an electrically insulating carrier with an electrical resistance layer arranged thereon can be fixed by a clamp and electrically contacted on one side. The carrier can be an electrically insulating, but relatively good heat-conducting ceramic plate, on which the resistance layer is applied, for example in the form of a so-called thick-film resistor. Contact surfaces, on which the contact is made, can be attached to the carrier on both ends of the resistance layer. The carrier should also preferably be arranged on the side of the bimetal with the material with a greater coefficient of expansion and the bimetal can preferably be largely straight at room temperature in the region covered by the carrier. As a result, the bimetal bends away from the ceramic carrier, but is at a very short distance from it at the beginning of the heating.

Die Klammer kann ein an dem Bimetall befestigtes, vorzugsweise taschenförmiges Federmaterialteil sein, das insbesondere seitliche Führungsränder hat. Der Träger kann also in diese Tasche bei der Montage einfach eingeschoben werden und wird dadurch automatisch einseitig kontaktiert. An dem am anderen Ende des Trägers befindlichen Ende kann die Widerstandsschicht durch eine Kontaktfeder mit einem Übertragungskontakt kontaktiert sein. Diese relativ leichte und dünne Kontaktfeder gibt den Bewegungen des Bimetall und damit des Trägers leicht nach und reicht zur Übertragung des geringen Heizstroms des Bimetalls aus. An ihrem dem Übertragungskontakt gegenüberliegenden Ende kann die Kontaktfeder zu einem vorzugsweise ovalen Zylinder geformt und in wenigstens einer entsprechenden Öffnung eines Gehäuses festgelegt sein. Dadurch wird eine nicht drehbare Achse geschaffen, die die Kontaktfeder in der gewünschten Lage am Gehäuse festlegt.The clip can be a preferably pocket-shaped spring material part fastened to the bimetal, which in particular has lateral guide edges. The carrier can therefore simply be pushed into this pocket during assembly and is thus automatically contacted on one side. At the other end of the carrier, the resistance layer can be contacted by a contact spring with a transmission contact. This relatively light and thin contact spring yields slightly to the movements of the bimetal and thus the carrier and is sufficient to transmit the low heating current of the bimetal. At its end opposite the transmission contact, the contact spring can be shaped into a preferably oval cylinder and fixed in at least one corresponding opening in a housing. This creates a non-rotatable axis that fixes the contact spring in the desired position on the housing.

Das Bimetall kann mit seinem freien Ende, das vorzugsweise gebogen ausgebildet ist, direkt auf den Betätigungspunkt eines Schnappschalter einwirken. Dadurch erübrigen sich Übertragungshebel oder dgl. Es kann ein Schnappschalter Verwendung finden, dessen Schnappfeder an einem biegsamen Federträger angebracht ist und der durch Biegung des Federträgers gegenüber einer an einem festen Teil eingestützten Federzunge betätigt wird.The free end of the bimetal, which is preferably curved, can act directly on the actuation point of a snap switch. This eliminates the need for transmission levers or the like. A snap switch can be used, the snap spring of which is attached to a flexible spring support and which is actuated by bending the spring support relative to a spring tongue supported on a fixed part.

Mit der elektrischen Beheizung ist es möglich, ein besonders vorteilhaftes Leistungssteuergerät herzustellen, bei dem das Bimetall einen Schenkel eines nahe seines Knickpunktes schwenkbar gelagerten Winkelhebels bildet, auf dessen anderen Schenkel eine Einstellkurve einwirkt. Dieser Schenkel des Winkelhebels kann aus zwei etwa parallel verlaufenden Streifen bestehen, von denen der eine von einem Kompensationsbimetall gebildet ist und sich vorzugsweise auf dem anderen Streifen über eine Justierschraube abstützt. Dadurch ist eine gemeinsam schwenkbare Einheit Arbeitsbimetall/Kompensationsbimetall geschaffen, die mit nur einer Schwenklagerung für alle auf den Schnappschalter einwirkenden Bewegungen auskommt (Arbeitsweg des Bimetalls, Kompensationsweg und Verstellweg der Einstellkurve).With the electric heating, it is possible to produce a particularly advantageous power control device in which the bimetal forms one leg of an angle lever which is pivotably mounted near its break point and on the other leg of which an adjustment curve acts. This leg of the angle lever can consist of two approximately parallel strips, one of which is formed by a compensation bimetal and preferably located on the other strip supported by an adjusting screw. This creates a jointly swiveling working bimetal / compensation bimetal unit that only needs one swivel bearing for all movements acting on the snap switch (working travel of the bimetal, compensation travel and adjustment travel of the setting curve).

Eine kraftschlüssige Andrückung dieses Winkelhebels an die Verstellkurve wird vorteilhaft von einer Schraubenfeder bewirkt. Zur Erleichterung der Montage kann diese auf einem vorzugsweise bolzenförmigen Führungsteil angeordnet sein, das bei der Montage mit gespannter und aus ihrer Mittelachse ausgelenkter Schraubenfeder hinter einer Gehäuseschulter, vorzugsweise einem Gehäuseschlitz, einrastbar und bei Betätigung des Winkelhebels ausrastbar ist. Mittels des Bolzens wird also die gespannte Schraubenfeder in dem Schlitz festgelegt. Bei der ersten Betätigung der Stellkurve, die schon bei der Justierung erfolgt, rastet der die Schraubenfeder haltende Bolzen automatisch aus dem Schlitz aus und bringt die Feder in Arbeitsstellung. Diese bevorzugte Montage kann auch bei anderen Teilen von Schaltern oder anderen Geräten vorteilhaft eingesetzt werden.A helical spring advantageously presses this angle lever against the adjustment curve. To facilitate assembly, it can be arranged on a preferably bolt-shaped guide part which, during assembly, can be snapped behind a housing shoulder, preferably a housing slot, with a tensioned coil spring deflected from its central axis and can be disengaged when the angle lever is actuated. The tensioned coil spring is thus fixed in the slot by means of the bolt. When the control curve is actuated for the first time, which is already done during adjustment, the bolt holding the coil spring automatically disengages from the slot and brings the spring into the working position. This preferred assembly can also be used advantageously in other parts of switches or other devices.

Das Leistungssteuergerät kann Abschalt-und/oder Signalkontaktfedern enthalten, die etwa parallel zueinander verlaufen, wobei eine der Kontaktfedern im "Aus"-Zustand des Leistungssteuergerätes in einer Vertiefung einer Schaltkurve liegt und vorzugsweise über ein isolierendes Schaltstück auf eine andere (oder mehrere) der Kontaktfedern einwirkt. Dadurch wird einerseits eine raumsparende Anbringung der für die Signalkontaktgabe oder doppelpolige Abschaltung gebrachten, beim Einschalten des Leistungssteuergerätes manuell betätigten Kontakte ermöglicht und andererseits sind die Kontakte im "Aus"-Zustand, d.h. den weitaus größten Teil der Zeit, im unbelasteten Zustand und können so nicht ermüden.The power control device can contain switch-off and / or signal contact springs which run approximately parallel to one another, one of the contact springs in the "off" state of the power control device being in a depression in a switching curve and preferably via an insulating contact piece to another (or more) of the contact springs acts. On the one hand, this enables space-saving attachment of the contacts which are used for signal contact or double-pole disconnection and are manually operated when the power control device is switched on, and on the other hand the contacts are in the "off" state, i.e. by far the majority of the time, in an unloaded state and thus cannot tire.

Merkmale von bevorzugten Weiterbildungen der Erfindung gehen außer aus den Unteransprüchen auch aus der Beschreibung und den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung verwirklicht sein können. Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigen

  • Fig. 1 eine Draufsicht auf ein Leistungssteuergerät mit abgenommenem Deckel,
  • Fig. 2 einen Schnitt nach der Linie 11/11 in Fig. 1,
  • Fig. 3 einen stark vergrößerten Detailschnitt nach der Linie 111 in Fig. 1,
  • Fig. 4 einen vergrößerten Detailschnitt nach der Linie IV in Fig. 2,
  • Fig. 5 eine Draufsicht auf einen Widerstandsträger und
  • Fig. 6 ein teilgeschnittenes Detail der in Fig. 1 oben links dargestellten Schraubenfeder.
Features of preferred developments of the invention emerge from the subclaims and also from the description and the drawings, the individual features being able to be implemented individually or in groups in the form of subcombinations in one embodiment of the invention. An embodiment of the invention is shown in the drawing and is explained in more detail below. Show it
  • 1 is a plan view of a power control device with the cover removed,
  • 2 shows a section along the line 11/11 in Fig. 1,
  • 3 shows a greatly enlarged detail section along the line 111 in FIG. 1,
  • 4 shows an enlarged detail section along the line IV in FIG. 2,
  • Fig. 5 is a plan view of a resistance carrier and
  • Fig. 6 is a partially sectioned detail of the coil spring shown in Fig. 1 top left.

Das dargestellte Leistungssteuergerät 11 besitzt ein Gehäuse 12, das aus einer Gehäusegrundplatte 13 und einem Gehäusedeckel 14 besteht. Sie bestehen aus duroplastischem Kunststoffmaterial und können mit Schrauben 15 an zwei Ecken zusammen geschraubt werden. In beiden Gehäuseteilen ist eine Einstellwelle 16 gelagert, die eine Einstellkurve 17 und eine Schaltkurve 18 trägt. Um eine Schwenkachse 19 in einer Gehäuseecke ist ein Winkelhebel 20 schwenkbar gelagert, der an einem U-förmigen Achsträger 21 in Längsrichtung der Achse gegeneinander versetzt ein Arbeitsbimetall 22 und ein Kompensationsbimetall 23 trägt, die am Achsträger 21 festgenietet sind. Das Arbeitsbimetall 22 erstreckt sich zuerst im wesentlichen gerade etwa parallel zu einer Gehäuseseite und ist dann bogenförmig in Richtung auf die Gehäusemitte abgebogen. Mit seinem freien Ende 24 drückt es gegen den Betätigungspunkt 25 eines Schnappschalters, dessen Schnappfeder 26 eine aus ihr heraus gebogene, an einem festen Träger 27 eingestützte Federzunge 28 hat und an ihren vom Arbeitskontakt 29 entfernten Ende im Bereich des Betätigungsdruckpunktes 25 mit einem biegsamen Schnappfederträger 30 verbunden ist. Der Schnappschalter 31 ist etwa parallel zur Haupterstreckung des Arbeitsbimetall 22 zwischen diesem und der Einstellwelle 16 bzw. der darauf angeordneten Schaltkurve 18 angeordnet. Der Arbeitskontakt 29 wirkt mit einem festen Gegenkontakt 32 zusammen, der durch die Gehäusegrundplatte hindurch, ebenso wie die anderen Schalteranschlüsse, mit Anschluß-Flachsteckzungen 33 verbunden ist, die von der Schalterrückseite, d.h. der Außenseite der Gehäusegrundplatte 13, senkrecht abstehen. Es können auch andere Schnappschaltertypen verwendet werden, die es auch gestatten, Umschaltkontakte vorzusehen, falls dies erwünscht ist.The power control device 11 shown has a housing 12, which consists of a housing base plate 13 and a housing cover 14. They consist of thermosetting plastic material and can be screwed together at two corners with screws 15. An adjusting shaft 16 is supported in both housing parts and carries an adjusting curve 17 and a switching curve 18. An angular lever 20 is pivotally mounted about a pivot axis 19 in a housing corner and bears a working bimetal 22 and a compensation bimetal 23, which are riveted to the axle carrier 21, on a U-shaped axle support 21 offset in the longitudinal direction of the axis. The working bimetal 22 first extends essentially straight approximately parallel to one side of the housing and is then bent in the shape of an arc in the direction of the center of the housing. With its free end 24, it presses against the actuation point 25 of a snap switch, the snap spring 26 of which has a spring tongue 28 bent out of it and supported on a fixed support 27 and at its end remote from the working contact 29 in the region of the actuation pressure point 25 with a flexible snap spring support 30 connected is. The snap switch 31 is arranged approximately parallel to the main extent of the working bimetal 22 between the latter and the setting shaft 16 or the switching curve 18 arranged thereon. The normally open contact 29 cooperates with a fixed mating contact 32, which, like the other switch connections, is connected through the housing base plate to terminal tabs 33 which extend from the rear of the switch, i.e. protrude vertically from the outside of the housing base plate 13. Other types of snap-action switches can also be used, which also allow switching contacts to be provided if desired.

Am Arbeitsbimetall 22 ist, wie insbesondere aus den Figuren 3 bis 5 zu erkennen ist, im Bereich seiner Wurzel, d.h. seinem am Achsträger 21 befestigten Ende, eine aus Federmaterial bestehende Klammer 35 durch Punktschweißung angebracht. Die Klammer bildet auf der zur Gehäuseseite gewandten Fläche des Bimetalls, die aus dem Material mit größerem Ausdehnungskoifizienten besteht, eine Tasche, in die ein Ende eines Trägers 36 gesteckt werden kann, der aus einem Blättchen oder Streifen aus elektrisch isolierendem Keramikmaterial besteht, das gute Wärmeleiteigenschaften hat. Der Träger trägt auf seiner vom Bimetall abgewandten Seite eine elektrische Widerstandsschicht 37 in Form eines längs des Trägers verlaufenden Streifens, die in Figur 1 und 4 als strichlierte Linie angedeutet ist. An den beiden Schmalseiten des langgestreckt rechteckigen Trägers sind zwei metallische Kontaktflächen 38 aufgebracht, auf die die Widerstandsschicht 37 heraufreicht und dadurch mit ihnen elektrisch leitend verbunden ist. Die Widerstandsschicht 37 kann aus an sich bekannten Dickschichtwiderständen bestehen, beispielsweise auf der Basis von Wismut bzw. Ru207. Der Träger kann aus A1203 bestehen. Die von der Klammer 35 gebildete Tasche 39 erstreckt sich über die gesamte Breite des Arbeitsbimetalls 22 und des etwa gleich breiten Trägers 36 und hat seitliche Abwinklungen 40, die den Träger 36 führen. Zwei warzenförmige Ausprägungen 41 in der Klammer 35 drükken auf eine der Kontaktflächen 38 und sorgen so fur einen sicheren Halt und gute Kontaktierung. Dadurch wird der Träger an seiner Wurzel in Kontakt zum Bimetall 22 und im übrigen, nach einer Abkröpfung 34 im Bimetall, mit geringem Abstand parallel zu diesem festgehalten, zumindest bei Raumtemperatur, wenn das Bimetall in diesem Bereich im wesentlichen gerade verläuft. Bei Erwärmung biegt sich das Bimetall zwar vom Träger weg, bekommt dann aber bei den höheren Temperaturen auch ausreichend Strahlungswärme, so daß noch eine ausreichende Wärmeübertragung vorliegt. Wesentlich ist jedoch, daß durch die gute Kontaktierung im unteren Temperaturbereich ein schnelles Ansprechen erfolgt.On the working bimetal 22, as can be seen in particular from FIGS. 3 to 5, in the region of its root, ie its end fastened to the axle support 21, a clip 35 made of spring material is attached by spot welding. The clip forms a pocket on the surface of the bimetal facing the housing, which consists of the material with a larger expansion coefficient, into which one end of a carrier 36 can be inserted, which consists of a sheet or strip of electrically insulating ceramic material, which has good thermal conductivity properties Has. The carrier carries on its side facing away from the bimetal an electrical resistance layer 37 in the form of a layer running along the carrier Strip, which is indicated in Figures 1 and 4 as a dashed line. On the two narrow sides of the elongated rectangular carrier, two metallic contact surfaces 38 are applied, to which the resistance layer 37 extends and is thus connected to them in an electrically conductive manner. The resistance layer 37 can consist of thick-film resistors known per se, for example based on bismuth or Ru 2 0 7 . The carrier can consist of A1 2 0 3 . The pocket 39 formed by the clamp 35 extends over the entire width of the working bimetal 22 and the approximately equally wide carrier 36 and has lateral angled portions 40 which guide the carrier 36. Two wart-shaped features 41 in the clamp 35 press on one of the contact surfaces 38 and thus ensure a secure hold and good contact. As a result, the carrier is held at its root in contact with the bimetal 22 and, after an offset 34 in the bimetal, at a small distance parallel to it, at least at room temperature, if the bimetal runs essentially straight in this area. When heated, the bimetal bends away from the carrier, but then also receives sufficient radiant heat at the higher temperatures, so that there is still sufficient heat transfer. It is essential, however, that the good contact results in a quick response in the lower temperature range.

Das andere Ende des Trägers 36 ist durch eine dünne Kontaktfeder 42 kontaktiert, die mit seitlich abgebogenen Enden auf einer Kontaktfläche 38 aufliegt. Das Material der Kontaktfeder ist am festgelegten Ende verbreitert und zu einem ovalen Zylinder 43 gerollt, der in entsprechenden Ausnehmungen der Gehäuseteile 13,14 liegt und die Kontaktfeder positioniert. Die Stromzuführung erfolgt über einen angeschweißten Draht 44 von einer Anschlußzunge her. Die Kontaktfeder bildet also einen sich mit dem Ende des Trägers bewegenden Anschluß, der seine Kontaktfläche aufgrund dieser Bewegung selbst sauber hält.The other end of the carrier 36 is contacted by a thin contact spring 42 which rests on a contact surface 38 with laterally bent ends. The material of the contact spring is widened at the fixed end and rolled into an oval cylinder 43, which lies in corresponding recesses in the housing parts 13, 14 and positions the contact spring. The power is supplied via a welded wire 44 from a connecting tongue. The contact spring therefore forms a connection which moves with the end of the carrier and which keeps its contact surface itself clean due to this movement.

Das Kompensationsbimetall 23 verläuft zu Beginn etwa rechtwinklig zum Arbeitsbimetall 22 und knickt dann etwas in Richtung Schaltermitte ab. Parallel zu ihm ist ein Federblechstreifen 45 im Bereich des Achsträgers 21 angebracht, der eine V-förmige Ausbiegung 46 hat, in die eine in das freie Ende des Kompensationsbimetalls eingeschraubte Justierschraube 47 eingreift. Durch die Justierschraube 47 können das Kompensationsbimetall 23 und der Streifen 45 in ihrem Abstand zueinander zur Einjustierung des Leistungssteuergerätes verstellt werden. Auf das freie Ende des Streifens 45 drückt ein Kopf 48 eines Bolzens 49, der diagonal aus einer Gehäuseecke hineinragt und auf seinem Schaft eine Schraubenfeder 50 führt, die den aus Kompensationsbimetall 23 und Streifen 45 gebildeten Schenkel 51 des Winkelhebels 20 mit der Ausbiegung 46 in Kontakt mit der Einstellkurve 17 drückt. Die Einstellkurve hat für eine stufenlose Einstellung des Leistungssteuergerätes eine spiralig verlaufende Außenfläche 52, die in ihrem Abschnitt mit größtem Radius in einer vorspringenden Nocke 53 endet, die eine Rastausnehmung enthält, in der die Ausprägung 46 im Figur 1 dargestellten "Aus"-Zustand des Leistungssteuergerätes 11 liegt. Am Kurvenende mit kleinstem Radius befindet sich eine Vertiefung 54, die für eine sichere Ansteuerung der Höchstleistung (100% relative Einschaltdauer) sorgt.The compensation bimetal 23 initially runs approximately at right angles to the working bimetal 22 and then bends slightly towards the center of the switch. A spring plate strip 45 is attached parallel to it in the area of the axle carrier 21 and has a V-shaped bend 46 into which an adjusting screw 47 screwed into the free end of the compensation bimetal engages. The adjusting screw 47 allows the compensation bimetal 23 and the strip 45 to be adjusted in their spacing from one another for adjusting the power control device. On the free end of the strip 45, a head 48 of a bolt 49 presses, which protrudes diagonally from a housing corner and carries a coil spring 50 on its shaft, which contacts the leg 51 of the bell crank 20 formed from compensation bimetal 23 and strip 45 with the bend 46 presses with the setting curve 17. For an infinitely variable setting of the power control device, the setting curve has a spiral outer surface 52, which ends in its section with the largest radius in a projecting cam 53, which contains a detent recess in which the configuration 46 shown in FIG. 1 shows the power control device in the "off" state 11 lies. At the end of the curve with the smallest radius there is a recess 54 which ensures reliable control of the maximum power (100% relative duty cycle).

Da sich die Schraubenfeder 50 mit ihrem einen Ende im Deckelteil 14 abstützt, die Montage aber von der Gehäusegrundplatte 13 ausgeht, wäre die Schraubenfeder an sich mit einer besonderen Montagevorrichtung vorzuspannen. Dies wird vorteilhaft vermieden, indem, wie in Figur 6 dargestellt ist, im Gehäusedeckel 14 ein Schlitz 56 vorgesehen ist, in den der Kopf 48 des Bolzens 49 bei der Vormontage hineingedrückt werden kann. Dabei biegt sich die Schraubenfeder 50 etwas aus ihrer geraden Lage aus, da sie mit ihrem einen Ende in einer Gehäusevertiefung 57 festgelegt ist und verklemmt sich so in gespannter Lage. Wenn das freie Ende des Streifens 45 das erste Mal gegen den Kopf 48 drückt, wenn die Einstellkurve in die in Figur 1 dargestellte Lage geschwenkt wird, dann wird der Kopf 48 aus seiner eingeklemmten Position frei gegeben und springt automatisch unter der Strekkungswirkung der Schraubenfeder in seine in Figur 6 strichliert eingezeichnete Arbeitsstellung. Er wird dabei von einer Abbiegung 58 des Streifens 45 positioniert.Since the coil spring 50 is supported at one end in the cover part 14, but the assembly is based on the housing base plate 13, the coil spring itself would have to be preloaded with a special mounting device. This is advantageously avoided by, as shown in FIG. 6, a slot 56 being provided in the housing cover 14, into which the head 48 of the bolt 49 can be pressed during the preassembly. The coil spring 50 bends somewhat from its straight position, since it is fixed at one end in a housing recess 57 and thus jams in a tensioned position. When the free end of the strip 45 presses against the head 48 for the first time when the setting curve is pivoted into the position shown in FIG. 1, the head 48 is released from its clamped position and automatically jumps into it under the action of the coil spring in Figure 6 dashed working position. It is positioned by a bend 58 of the strip 45.

Auf der dem Arbeitsbimetall 22 und dem Schnappschalter 31 gegenüberliegenden Seite der Einstellwelle sind im Gehäuse zwei Kontaktfedern 60 und 61 vorgesehen, die an ihren freien Enden Kontakte tragen, die für eine Signalkontaktgabe bzw. die Ausschaltung des zweiten Pols des Haushaltsstromnetzes vorgesehen sind. Die selbstfedernden Kontaktfedern sind einseitig an ins Gehäuse eingesteckten, mit den Flachsteckzungen einstückigen Haltern angebracht. Die nahe der Einstellwelle verlaufende Kontaktfeder 60 hat eine Ausbiegung 62, die auf der Schaltkurve 18 läuft und im dargestellten "Aus"-Zustand des Leistungssteuergerätes 11 in einer entsprechenden Vertiefung der Schaltkurve 18 liegt, dadurch entspannt ist und die Kontakte beider Kontaktfedern 60,61 geöffnet hat. Die Kontaktfeder 61 für Signalkontaktgabe, d.h. die Anzeige, ob das Leistungssteuergerät eingeschaltet ist, wird durch ein Isolier-Druckstück 64 betätigt, das an der Kontaktfeder 60 befestigt ist. Die Schaltkurve 18 hat, abgesehen von der Vertiefung eine konzentrische Außenfläche.On the opposite side of the adjusting shaft from the working bimetal 22 and the snap switch 31, two contact springs 60 and 61 are provided in the housing, which bear at their free ends contacts which are provided for signal contact or for switching off the second pole of the household power supply. The self-resilient contact springs are attached on one side to holders inserted into the housing and integral with the flat tabs. The contact spring 60 running close to the setting shaft has a bend 62 which runs on the switching curve 18 and, in the illustrated "off" state of the power control device 11, lies in a corresponding recess in the switching curve 18, is thereby relaxed and the contacts of both contact springs 60, 61 open Has. The contact spring 61 for signal contact, i.e. the indication of whether the power control device is switched on is actuated by an insulating pressure piece 64 which is fastened to the contact spring 60. The switching curve 18 has, apart from the depression, a concentric outer surface.

Die Arbeitsweise entspricht der eines Leistungssteuergerätes. Wenn bei Einschaltung durch Drehung der Einstellwelle in Figur 1 im Uhrzeigersinn die Ausbiegung 46 aus der Rast heraus kommt, wobei der Benutzer einen Widerstand überwinden muß, dann verschwenkt sich der Winkelhebel entgegen dem Uhrzeigersinn bis zum gewünschten Einstellwert, wodurch das Arbeitsbimetall 22 mit seinem freien Ende 24 dem dagegen drückenden Schnappfederträger 30 Raum zur Verschwenkung entgegen dem Uhrzeigersinn gibt. Dadurch schließt der Schnappschalter 31 die vorher geöffneten Kontakte 29,32 beim Umschnappen der Schnappfeder 26 und ein angeschlossener Verbraucher bekommt ebenso Strom wie die Widerstandsschicht 37, die mit dem Verbraucher parallel geschaltet ist, d.h. mit der vollen Netzspannung betrieben wird. Sie erwärmt den Träger 36 und dieser das Arbeitsbimetall, so daß es sich auslenkt und sein Ende 24 wieder verstärkt gegen den Betätigungsdruckpunkt 25 des Schnappschalters 31 drückt, so daß dieser nach einiger Zeit wieder geöffnet wird. Nach einer entsprechenden Abkühlzeit beginnt das Schaltspiel von neuem. Die Reaktionszeit kann leicht durch die Dicke und Ankopplung des Trägers 36 bestimmt werden. Die Stromzuführung zu dem von der Klammer 35 festgelegten Ende der durch die Widerstandsschicht 37 gebildeten Bimetallbeheizung erfolgt über den Kontakt des Arbeitsbimetalls mit dem unter Spannung stehenden Schnappschalter. Das Kompensationsbimetall 23 biegt sich entsprechend der Umgebungstemperatur aus und kompensiert diese.The mode of operation corresponds to that of a power control unit. If, when switched on by turning the setting shaft in FIG. 1 in a clockwise direction, the bend 46 comes out of the catch, whereby the user has to overcome resistance, the angle lever pivots counterclockwise to the desired setting value, as a result of which the working bimetal 22 has its free end 24 the snap spring support 30, which presses against it, gives space for pivoting counterclockwise. As a result, the snap switch 31 closes the previously opened contacts 29, 32 when the snap spring 26 is snapped and a connected consumer receives current as does the resistance layer 37, which is connected in parallel with the consumer, i.e. is operated with the full mains voltage. It heats the carrier 36 and this the working bimetal, so that it deflects and its end 24 presses again against the actuation pressure point 25 of the snap switch 31, so that it is opened again after some time. After a corresponding cooling time, the switching cycle starts again. The reaction time can easily be determined by the thickness and coupling of the carrier 36. The current supply to the end of the bimetallic heating formed by the resistance layer 37, which is defined by the clamp 35, takes place via the contact of the working bimetallic element with the live snap switch. The compensation bimetal 23 bends and compensates for the ambient temperature.

Beim Einschalten wurde die Kontaktfeder 60 und mit ihr über das Druckstück 64 die Kontaktfeder 61 in Figur 1 nach oben gedrückt und dadurch die Kontakte geschlossen.When switching on, the contact spring 60 and with it the pressure spring 64, the contact spring 61 in FIG. 1 was pressed up and the contacts closed.

Die beschriebene Bimetallheizung ist für ein Leistungssteuergerät besonders gut geeignet, kann aber auch für andere Geräte verwendet werden, bei denen es auf eine vorteilhafte Beheizung eines Bimetalls oder ähnlichen Teiles ankommt, z.B. bei thermischen Zeitschaltwerken.The bimetallic heater described is particularly well suited for a power control device, but can also be used for other devices in which an advantageous heating of a bimetallic or similar part is important, e.g. in thermal time switches.

Durch die Lage und Größe der Abkörpfung 34 des Arbeitsbimetalls 22 kann der gewünschte thermische Ankopplungsgrad der Heizung an das Bimetall bestimmt werden, um beispielsweise die Schalthäufigkeit zu variieren. Träger und Bimetall könnten auch über den größten Teil des Heizungsbereiches aneinander anliegen.The position and size of the bend 34 of the working bimetal 22 can be used to determine the desired degree of thermal coupling of the heating to the bimetal, for example in order to vary the switching frequency. Carrier and bimetal could also be in contact with one another over most of the heating area.

Claims (10)

1. Electrical heating system for a bimetal, particularly for an electrical power control device, in which close to one end of the bimetal (22) is fixed by a clip (35) and electrically contacted on one side an electrical insulating support (36) with an electric resistive film (37) thereon and in the heated area covered by the support (36) the bimetal (22) in the vicinity of the fixing of the support engages thereon, characterized in that at ambient temperature the bimetal (22) passes over a further, greatest part of the length of the support (36) at a limited distance from and substantially parallel to said support (36).
2. Heating system according to claim 1, characterized in that clip (35) is a spring material part fixed to bimetal (22) and preferably forming a pocket shape and which in particular has lateral guidance edges (40).
3. Heating system according to claims 1 or 2, characterized in that contact faces (38) applied to the support (36) are connected to both ends of the resistive film (37) preferably constructed as a thick film resistor.
4. Heating system according to one of the preceding claims, characterized in that at the end of support (36) opposite to clip (35) resistive film (37) is contacted by a contact spring (42), which is preferably shaped at its fixing end to a preferably oval cylinder (43) and is secured in at least one corresponding opening of a casing (12).
5. Heating system according to one of the preceding claims, characterized in that the end of the bimetal (22) connected to support (36) is fitted optionally in articulated manner to a casing (12).
6. Heating system according to one of the preceding claims, characterized in that support (36) is arranged on the side of bimetal (22) with the material having the higher expansion coefficient.
7. Heating system according to one of the preceding claims, characterized in that the preferably curved free end (24) of bimetal (22) acts directly on the actuating point (25) of a snap switch (31).
8. Power control device with an electrical heating of its bimetal (22) according to one of the preceding claims, characterized in that bimetal (22) forms one leg of a bent lever (20) pivotably mounted in the vicinity of its knee and on whose other leg (51) preferably comprising two roughly parallel strips acts a setting cam (17) and that of the two strips one is a compensation bimetal (23) and which is preferably supported on the other strip (45) by means of an adjusting screw (47).
9. Power control device according to claim 8, characterized in that for acting on one leg (51) of bent lever (20) a helical spring (50) is provided, which is arranged on a preferably bolt- like guidance part (49), which can be engaged behind a casing shoulder (56) with a tensioned helical spring deflected from its central axis and is disengageable on actuating bent lever (51
10. Power control device according to one of the preceding claims, characterized in that it contains disconnection and/or signal contact springs (60, 61), which are approximately parallel to one another, whereby one of the contact springs (60) in the "off" state of power control device (11) is located in a depression of an index cam (18) and preferably acts via an insulating contact piece (64) on another of the contact springs (61).
EP86102502A 1985-03-08 1986-02-26 Electrical heater for a bimetal, in particular for an electrical power regulator Expired - Lifetime EP0194512B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86102502T ATE75344T1 (en) 1985-03-08 1986-02-26 ELECTRICAL HEATER FOR A BIMETAL, IN PARTICULAR FOR AN ELECTRICAL POWER CONTROL UNIT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3508248 1985-03-08
DE19853508248 DE3508248A1 (en) 1985-03-08 1985-03-08 ELECTRIC HEATING FOR A BIMETAL, IN PARTICULAR FOR AN ELECTRICAL POWER CONTROL UNIT

Publications (4)

Publication Number Publication Date
EP0194512A2 EP0194512A2 (en) 1986-09-17
EP0194512A3 EP0194512A3 (en) 1987-12-23
EP0194512B1 true EP0194512B1 (en) 1992-04-22
EP0194512B2 EP0194512B2 (en) 1996-04-03

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EP86102502A Expired - Lifetime EP0194512B2 (en) 1985-03-08 1986-02-26 Electrical heater for a bimetal, in particular for an electrical power regulator

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US (1) US4704595A (en)
EP (1) EP0194512B2 (en)
JP (1) JPS61216212A (en)
AT (1) ATE75344T1 (en)
AU (1) AU589607B2 (en)
DE (2) DE3508248A1 (en)
ES (1) ES8706288A1 (en)
YU (1) YU46519B (en)

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DE2625716C3 (en) * 1976-06-09 1979-10-11 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen Power control unit
GB1515356A (en) * 1976-08-02 1978-06-21 Emi Ltd Electric switch
DE3143691A1 (en) * 1981-11-04 1983-05-11 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Control heating for a power control unit
JPS58108625A (en) * 1981-12-21 1983-06-28 株式会社日立製作所 Thick film relay

Also Published As

Publication number Publication date
EP0194512A3 (en) 1987-12-23
EP0194512B2 (en) 1996-04-03
YU33086A (en) 1988-02-29
JPS61216212A (en) 1986-09-25
JPH0582693B2 (en) 1993-11-22
DE3508248A1 (en) 1986-09-11
EP0194512A2 (en) 1986-09-17
DE3684940D1 (en) 1992-05-27
AU589607B2 (en) 1989-10-19
ES552774A0 (en) 1987-06-01
ATE75344T1 (en) 1992-05-15
US4704595A (en) 1987-11-03
ES8706288A1 (en) 1987-06-01
AU5440386A (en) 1986-09-11
YU46519B (en) 1993-11-16

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