EP0134929B1 - Apparatus for heating hot plates - Google Patents

Apparatus for heating hot plates Download PDF

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Publication number
EP0134929B1
EP0134929B1 EP84107169A EP84107169A EP0134929B1 EP 0134929 B1 EP0134929 B1 EP 0134929B1 EP 84107169 A EP84107169 A EP 84107169A EP 84107169 A EP84107169 A EP 84107169A EP 0134929 B1 EP0134929 B1 EP 0134929B1
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EP
European Patent Office
Prior art keywords
food
heating
housing
plate
heating element
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
Application number
EP84107169A
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German (de)
French (fr)
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EP0134929A1 (en
Inventor
Paul Lüscher
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.)
Luekon Fabrik fur Elektrothermische Apparate und Elektrische Stabheizkorper Paul Luescher
Original Assignee
Luekon Fabrik fur Elektrothermische Apparate und Elektrische Stabheizkorper Paul Luescher
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Application filed by Luekon Fabrik fur Elektrothermische Apparate und Elektrische Stabheizkorper Paul Luescher filed Critical Luekon Fabrik fur Elektrothermische Apparate und Elektrische Stabheizkorper Paul Luescher
Priority to AT84107169T priority Critical patent/ATE29957T1/en
Publication of EP0134929A1 publication Critical patent/EP0134929A1/en
Application granted granted Critical
Publication of EP0134929B1 publication Critical patent/EP0134929B1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/028—Heaters specially adapted for trays or plates to keep food or liquids hot

Definitions

  • the invention relates to an apparatus for heating heat-storing food heating plates, with a housing into which a plurality of food heating plates can be inserted through slots in a housing wall and in which an electrical heating device is arranged.
  • Devices of this type have been known for a long time, for example from CH-A-323 543.
  • the electrical heating device for heating the common housing interior to an end temperature is arranged.
  • the food heating plates inserted into the housing are heated together and removed and reinserted individually as required.
  • the object of the invention is therefore to avoid the disadvantage of high energy consumption or to enable energy savings in a device of the type mentioned, in which the electrical heating device is arranged in the housing and the food warming plates do not contain any electrical energy savings, and yet a quick individual to ensure automatic heating of the required hot plates up to a predetermined final temperature.
  • the heating device consists of heating elements which are each individually assigned to one of the food heating plates in the housing in order to heat this food heating plate, that a switch is arranged for switching on and off each heating element, which is switched by the associated food heating plate can be actuated in the inserted state, and that each heating element can also be switched off by a thermostat switch arranged in the housing, which is controlled by a temperature sensor which is arranged to determine the temperature of the respectively assigned food heating plate.
  • the apparatus it is not necessary to heat the entire housing with all the food warming plates if only a few food warming plates are required. Instead, you can push as many plates into the housing as needed at any given time or at any number of times.
  • the inserted heating element is automatically switched on by each inserted plate and remains switched on until the plate has reached a desired predetermined end temperature.
  • the temperature sensor assigned to each plate monitors the temperature of the plate itself; the heating element in question and the surroundings of the plate can be at a higher temperature than the desired end temperature of the plate during the heating of the plate, so that a very rapid heating of each individual plate is ensured.
  • food warming plates that have been used and have cooled down can be individually heated up again very quickly to the desired final temperature at any time.
  • An apparatus for heating objects in which each object is assigned its own heating element, which is switched on with a limit switch actuated by the object in the state inserted into the apparatus, is known per se from FR-A-2 357 221.
  • the objects to be heated are here a kind of boxes for holding containers which contain food to be heated.
  • the power supply to all heating elements is switched on together before the food is used and is switched off or reduced again by a timer after a predetermined period of time. In such an apparatus, it is not possible to automatically and quickly automatically heat objects at different times to a predetermined final temperature.
  • thermostatically controlled heating ovens or the like are also known, in which objects can be heated to a predetermined final temperature, but in which - with the disadvantage described at the beginning - the entire interior of the housing is heated with a single heating device.
  • DE-B-1 130 565 describes an apparatus for heating two food heating plates with a common radiator. The radiator is switched off by a thermostat switch when the temperature in the interior of the housing in the radiator has reached a predetermined final value. In such devices, the temperature of the objects to be heated approaches the final temperature maintained in the housing asymptotically, and rapid and individual heating of the objects to the final temperature, as in the apparatus of the present invention, is not possible.
  • thermostat switch is provided for each food warming plate.
  • the thermostat switches are also arranged separately from the food heating plates in the housing, they are controlled by the temperatures of the plates, which are determined by temperature sensors.
  • a thermostat switch controlled by a temperature sensor is also known per se, cf. US-A-2 834 868.
  • the temperature sensor is only used because the thermostat switch is separated from the heating element; the temperature sensor also detects the temperature of the heating element or pan bottom in which the heating element is embedded.
  • the apparatus shown has a housing 1 with a front wall 2, in which several parallel horizontal slots 3 are provided, through which heat-storing heating plates 4 can be pushed into the housing.
  • Each food heating plate 4 is fastened to a bracket 8 by means of supporting rods 5, the ends of which form handles and at the same time feet for setting up the plate 4.
  • guide rails 7 are arranged for each plate 4 or behind each slot, which receive the support rods 5.
  • an electrical heating element 8 is arranged in the housing 1 under each feed heating plate 4 or between the guide rails 7 associated therewith. Under each heating element 8 there is a heat shield in the form of a radiation plate 9.
  • Each food heating plate 4 touches with the end face in the inserted state of an associated horizontal heat transfer pin 10, which is mounted in heat-resistant guides 11, 12 so as to be axially displaceable against rotation and is pressed by a spring 1.3 against the end face of the plate 4.
  • a thermostatic switch 14 is fastened with good thermal conductivity.
  • the thermostat switch 14 has two connecting terminals 15 which touch two contact blades 17 fastened on an insulating plate 16.
  • the electrical circuit of the elements described, which are assigned to each of the plates 4, is shown in FIG. 4.
  • the circuit to the heating element 8 runs from a (all heating elements common) main switch 18 via a first of the contact fins 17, the thermostat switch 14 and the second of the contact fins 17.
  • a signal lamp 19 is connected in parallel to the heating element 8 for each heat storage plate 4.
  • Another signal lamp 420 is located between a connection terminal of the heating element 8 and the one connection terminal 15 of the thermostat switch 14.
  • the mode of operation is as follows for each food heating plate 4.
  • the pin 10 holds the thermostat switch 14 with its connecting terminals 15 in contact with the contact blades 17.
  • the circuit via the contact blades 17 and the thermostat switch 14 to the heating element 8 is closed.
  • the plate 4 is heated by the heating element 8 until it reaches a predetermined end temperature. This final temperature of the plate 4 is transferred via the heat-conducting pin 10 to the thermostat switch 14, which opens and switches off the heating element 8.
  • the signal lamp 19 lights up. It goes out when the thermostat switch 14 switches off.
  • the signal lamp 20 lights up. This signals the readiness of the heated inserted plate 4.
  • Such can for example have the form of pressed-in cams 21 (FIG. 2) in the guide rails 7, which cams fully inserted plate 4 engage in corresponding recesses in the plate support rods 5.

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  • Devices For Warming Or Keeping Food Or Tableware Hot (AREA)
  • Cookers (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)

Abstract

An apparatus for heating food-warmer plates includes a housing into which a plurality of the food-warmer plates may be slid through slots in a wall of the housing. An electrical heating element is disposed under each food-warmer plate inserted into the housing. The heating elements may be switched on and off individually. In this way it is possible to heat only that number of food-warmer plates which is actually needed.

Description

Die Erfindung bezieht sich auf einen Apparat zum Aufheizen von wärmespeichernden Speisewärmeplatten, mit einem Gehäuse, in welches mehrere Speisewärmeplatten durch Schlitze in einer Gehäusewand hindurch einschiebbar sind und in welchem eine elektrische Heizeinrichtung angeordnet ist.The invention relates to an apparatus for heating heat-storing food heating plates, with a housing into which a plurality of food heating plates can be inserted through slots in a housing wall and in which an electrical heating device is arranged.

Apparate dieser Art sind seit längerer Zeit bekannt, etwa aus der CH-A-323 543. In den bekannten Apparaten ist die elektrische Heizeinrichtung zum Aufheizen des gangen Gehäuseinnenraumes auf eine Endtemperatur angeordnet. Die in das Gehäuse eingeschobenen Speisewärmeplatten werden gemeinsam aufgeheizt und nach Bedarf jeweils einzeln entnommen und wieder eingeschoben.Devices of this type have been known for a long time, for example from CH-A-323 543. In the known devices, the electrical heating device for heating the common housing interior to an end temperature is arranged. The food heating plates inserted into the housing are heated together and removed and reinserted individually as required.

Wenn nur wenige aufgeheizte Wärmeplatten tatsächlich benötigt werden, dann brauchen die bekannten Apparate zu diesem Zweck relativ viel Energie, weil stets das ganze Gehäuse und alle in dieses eingeschobenen Wärmeplatten, auch die nicht benötigten, aufgeheizt werden müssen.If only a few heated heating plates are actually required, then the known apparatuses require a relatively large amount of energy for this purpose, because the entire housing and all heating plates inserted therein, including those that are not required, must always be heated.

Dieser Nachteil ist bei einem Apparat zum Aufheizen von Speisewärmeplatten anderer Art vermieden, bei dem in jede Speisewärmeplatte ein eigenes elektrisches Heizelement eingebaut ist und ein Gehäuse, in welches mehrere solcher Speisewärmeplatten einschiebbar sind, keine Heizeinrichtung, sondern lediglich elektrische Kontakte für den Anschluss der Speisewärmeplatten enthält (FR-A-2 286 630). Speisewärmeplatten, die elektrische Einrichtungen enthalten und an denen Anschlusskontakte für diese Einrichtungen vorhanden sind, sind jedoch zumindest für die gewerbliche Verwendung, z. B. in Restaurantbetrieben, nicht geeignet, weil sie nicht in einfacher Weise ordnungsgemäss gereinigt werden können. Bei der Reinigung muss auf die elektrischen Einrichtungen und Anschlusskontakte Rücksicht genommen werden. Bei unvorsichtigem Reinigen oder Waschen besteht immer die Gefahr einer Beschädigung der elektrischen Einrichtungen und/oder Anschlusskontakte, wobei sich Kurzschlüsse oder lebensgefährliche Erdschlüsse ergeben können.This disadvantage is avoided in an apparatus for heating up different types of food heating plates, in which a separate electrical heating element is installed in each food heating plate and a housing into which several such food heating plates can be inserted does not contain a heating device, but only electrical contacts for the connection of the food heating plates (FR-A-2 286 630). Food heating plates, which contain electrical devices and on which there are connection contacts for these devices, are at least for commercial use, e.g. B. in restaurants, not suitable because they can not be cleaned properly in a simple manner. The electrical equipment and connection contacts must be taken into account when cleaning. Careless cleaning or washing always poses a risk of damage to the electrical equipment and / or connection contacts, which can result in short circuits or life-threatening earth faults.

Die Aufgabe der Erfindung besteht daher darin, bei einem Apparat der eingangs angegebenen Art, bei dem die elektrische Heizeinrichtung im Gehäuse angeordnet ist und die Speisewärmeplatten keine elektrischen Teile enthalten, den Nachteil des hohen Energieverbrauchs zu vermeiden bzw. Energieeinsparungen zu ermöglichen und trotzdem ein rasches individuelles automatisches Aufheizen jeweils benötigter Speisewärmeplatten bis auf eine vorbestimmte Endtemperatur zu gewährleisten.The object of the invention is therefore to avoid the disadvantage of high energy consumption or to enable energy savings in a device of the type mentioned, in which the electrical heating device is arranged in the housing and the food warming plates do not contain any electrical energy savings, and yet a quick individual to ensure automatic heating of the required hot plates up to a predetermined final temperature.

Die Aufgabe wird erfindungsgemäss dadurch gelöst, dass die Heizeinrichtung aus Heizelementen besteht, die einzeln jeweils einer der Speisewärmeplatten im Gehäuse zugeordnet sind, um diese Speisewärmeplatte aufzuheizen, dass für das Ein- und Ausschalten jedes Heizelementes jeweils ein Schalter angeordnet ist, der durch die zugeordnete Speisewärmeplatte im eingeschobenen Zustand betätigbar ist, und dass jedes Heizelement auch durch je einen im Gehäuse angeordneten Thermostatschalter ausschaltbar ist, der von einem Temperaturfühler gesteuert ist, welcher zum Feststellen der Temperatur der jeweils zugeordneten Speisewärmeplatte angeordnet ist.The object is achieved according to the invention in that the heating device consists of heating elements which are each individually assigned to one of the food heating plates in the housing in order to heat this food heating plate, that a switch is arranged for switching on and off each heating element, which is switched by the associated food heating plate can be actuated in the inserted state, and that each heating element can also be switched off by a thermostat switch arranged in the housing, which is controlled by a temperature sensor which is arranged to determine the temperature of the respectively assigned food heating plate.

Im erfindungsgemässen Apparat ist es nicht nötig, das ganze Gehäuse mit allen Speisewärmeplatten aufzuheizen, wenn nur einige wenige Speisewärmeplatten benötigt werden. Stattdessen kann man in einem gegebenen Zeitpunkt oder auch in beliebig verschiedenen Zeitpunkten jeweils soviele Platten ganz in das Gehäuse hineinschieben, wie gerade benötigt werden. Durch jede eingeschobene Platte wird automatisch das zugeordnete Heizelement eingeschaltet und bleibt so lange eingeschaltet, bis die Platte eine gewünschte vorbestimmte Endtemperatur erleicht hat. Der jeder Platte zugeordnete Temperaturfühler überwacht dabei die Temperatur der Platte selbst ; das betreffende Heizelement und die Umgebung der Platte können während des Aufheizens der Platte eine höhere Temperatur als die gewünschte Endtemperatur der Platte haben, so dass ein sehr rasches Aufheizen jeder einzelnen Platte gewährleistet ist. In gleicher Weise wie eben beschrieben können auch Speisewärmeplatten, die gebraucht worden sind und sich dabei abgekühlt haben, in beliebigen Zeitpunkten einzeln sehr rasch wieder auf die gewünschte Endtemperatur aufgeheizt werden.In the apparatus according to the invention, it is not necessary to heat the entire housing with all the food warming plates if only a few food warming plates are required. Instead, you can push as many plates into the housing as needed at any given time or at any number of times. The inserted heating element is automatically switched on by each inserted plate and remains switched on until the plate has reached a desired predetermined end temperature. The temperature sensor assigned to each plate monitors the temperature of the plate itself; the heating element in question and the surroundings of the plate can be at a higher temperature than the desired end temperature of the plate during the heating of the plate, so that a very rapid heating of each individual plate is ensured. In the same way as just described, food warming plates that have been used and have cooled down can be individually heated up again very quickly to the desired final temperature at any time.

Ein Apparat zum Heizen von Gegenständen, in welchem jedem Gegenstand je ein eigenes Heizelement zugeordnet ist, das je mit einem vom Gegenstand im in den Apparat eingeschobenen Zustand betätigten Endlagenschalter eingeschaltet wird, ist an sich aus der FR-A-2 357 221 bekannt. Die zu heizenden Gegenstände sind hier eine Art Schachteln zur Aufnahme von Behältern, welche aufzuwärmende Speisen enthalten. Die Stromzufuhr zu allen Heizelementen (über die betreffenden Endlagenschalter) wird vor der Verwendung der Speisen gemeinsam eingeschaltet und von einem Zeitgeber nach Ablauf einer vorbestimmten Zeitspanne wieder abgeschaltet oder reduziert. In einem solchen Apparat ist es nicht möglich, Gegenstände zu verschiedenen Zeitpunkten individuell und rasch automatisch jeweils bis auf eine vorbestimmte Endtemperatur aufzuheizen.An apparatus for heating objects, in which each object is assigned its own heating element, which is switched on with a limit switch actuated by the object in the state inserted into the apparatus, is known per se from FR-A-2 357 221. The objects to be heated are here a kind of boxes for holding containers which contain food to be heated. The power supply to all heating elements (via the relevant limit switches) is switched on together before the food is used and is switched off or reduced again by a timer after a predetermined period of time. In such an apparatus, it is not possible to automatically and quickly automatically heat objects at different times to a predetermined final temperature.

Anderseits sind auch thermostatisch gesteuerte Wärmeschränke o. dgl. bekannt, in denen Gegenstände auf eine vorbestimmte Endtemperatur aufgeheizt werden können, in denen aber wiederum - mit dem eingangs beschriebenen Nachteil - mit einer einzigen Heizeinrichtung der ganze Gehäuseinnenraum aufgeheizt wird. Aehnlich beschreibt die DE-B-1 130 565 einen Apparat zum Aufheizen von zwei Speisewärmeplatten mit einem gemeinsamen Heizkörper. Der Heizkörper wird von einem Thermostatschalter ausgeschaltet, wenn die Temperatur im Gehäuseinnenraum beim Heizkörper einen vorbestimmten Endwert erreicht hat. In solchen Einrichtungen nähert sich die Temperatur der aufzuheizenden Gegenstände asymptotisch der im Gehäuse aufrechterhaltenen Endtemperatur, ein rasches und individuelles Aufheizen der Gegenstände auf die Endtemperatur, wie im Apparat der vorliegenden Erfindung, ist nicht möglich.On the other hand, thermostatically controlled heating ovens or the like are also known, in which objects can be heated to a predetermined final temperature, but in which - with the disadvantage described at the beginning - the entire interior of the housing is heated with a single heating device. Similarly, DE-B-1 130 565 describes an apparatus for heating two food heating plates with a common radiator. The radiator is switched off by a thermostat switch when the temperature in the interior of the housing in the radiator has reached a predetermined final value. In such devices, the temperature of the objects to be heated approaches the final temperature maintained in the housing asymptotically, and rapid and individual heating of the objects to the final temperature, as in the apparatus of the present invention, is not possible.

Im erfindungsgemässen Apparat ist für jede Speisewärmeplatte je ein eigener Thermostatschalter vorgesehen. Die Thermostatschalter sind zwar ebenfalls getrennt von den Speisewärmeplatten im Gehäuse angeordnet, sie werden jedoch von den Temperaturen der Platten gesteuert, die von Temperaturfühlern festgestellt werden.In the apparatus according to the invention, a separate thermostat switch is provided for each food warming plate. Although the thermostat switches are also arranged separately from the food heating plates in the housing, they are controlled by the temperatures of the plates, which are determined by temperature sensors.

Ein von einem Temperaturfühler gesteuerter Thermostatschalter ist zwar ebenfalls an sich bekannt, vgl. US-A-2 834 868. Hier wird der Temperaturfühler aber lediglich verwendet, weil der Thermostatschalter vom Heizelement getrennt ist ; der Temperaturfühler stellt auch hier die Temperatur des Heizelementes bzw. des Pfannenbodens fest, in den das Heizelement eingelassen ist.A thermostat switch controlled by a temperature sensor is also known per se, cf. US-A-2 834 868. Here, however, the temperature sensor is only used because the thermostat switch is separated from the heating element; the temperature sensor also detects the temperature of the heating element or pan bottom in which the heating element is embedded.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnungen näher erläutert. In diesen zeigen :

  • Figur 1 eine perspektivische Ansicht eines Apparates zum Aufheizen von Speisewärmeplatten,
  • Figur 2 schematisch einen Vertikalschnitt durch einen Teil des Apparates,
  • Figur 3 schematisch einen Horizontalschnitt und
  • Figur 4 ein elektrisches Schaltschema für eines der Heizelemente in dem Apparat.
An embodiment of the invention is explained below with reference to the drawings. In these show:
  • FIG. 1 shows a perspective view of an apparatus for heating food warming plates,
  • FIG. 2 shows schematically a vertical section through part of the apparatus,
  • Figure 3 schematically shows a horizontal section and
  • Figure 4 is an electrical circuit diagram for one of the heating elements in the apparatus.

Der dargestellte Apparat besitzt ein Gehäuse 1 mit einer Vorderwand 2, in der mehrere parallele horizontale Schlitze 3 vorgesehen sind, durch welche hindurch wärmespeichernde Speisewärmeplatten 4 in das Gehäuse geschoben werden können. Jede Speisewärmeplatte 4 ist über Tragstäbe 5 an einem Bügel 8 befestigt, dessen Enden Handgriffe und zugleich Füsse zum Aufstellen der Platte 4 bilden. In dem Gehäuse 1 sind für jede Platte 4 bzw. hinter jedem Schlitz 3 Führungsschienen 7 angeordnet, welche die Tragstäbe 5 aufnehmen.The apparatus shown has a housing 1 with a front wall 2, in which several parallel horizontal slots 3 are provided, through which heat-storing heating plates 4 can be pushed into the housing. Each food heating plate 4 is fastened to a bracket 8 by means of supporting rods 5, the ends of which form handles and at the same time feet for setting up the plate 4. In the housing 1 3 guide rails 7 are arranged for each plate 4 or behind each slot, which receive the support rods 5.

Ferner ist im Gehäuse 1 unter jeder Speisewärmeplatte 4 bzw. zwischen den dieser zugeordneten Führungsschienen 7 je ein elektrisches Heizelement 8 angeordnet. Unter jedem Heizelement 8 befindet sich eine Wärmeabschirmung in Form eines Strahlungsblechs 9.Furthermore, an electrical heating element 8 is arranged in the housing 1 under each feed heating plate 4 or between the guide rails 7 associated therewith. Under each heating element 8 there is a heat shield in the form of a radiation plate 9.

Jede Speisewärmeplatte 4 berührt mit der Stirnseite in eingeschobenem Zustand je einen zugeordneten horizontalen Wärmeübertragungsstift 10, der in wärmebeständigen Führungen 11, 12 verdrehungssicher axial verschiebbar gelagert ist und von einer Feder 1.3 gegen die Stirnseite der Platte 4 gedrückt wird. Auf dem von der Platte 4 abgekehrten Ende dieses Stiftes 10 ist metallisch gut wärmeleitend ein Thermostatschalter 14 befestigt. Der Thermostatschalter 14 besitzt zwei Anschlussklemmen 15, welche zwei auf einer Isolierplatte 16 befestigte Kontaktlamellen 17 berühren.Each food heating plate 4 touches with the end face in the inserted state of an associated horizontal heat transfer pin 10, which is mounted in heat-resistant guides 11, 12 so as to be axially displaceable against rotation and is pressed by a spring 1.3 against the end face of the plate 4. On the end of this pin 10 facing away from the plate 4, a thermostatic switch 14 is fastened with good thermal conductivity. The thermostat switch 14 has two connecting terminals 15 which touch two contact blades 17 fastened on an insulating plate 16.

Die elektrische Schaltung der beschriebenen Elemente, die jeweils jeder der Platten 4 zugeordnet sind, ist in Fig. 4 dargestellt. Der Stromkreis zum Heizelement 8 verläuft von einem (allen Heizelementen gemeinsamen) Hauptschalter 18 über eine erste der Kontaktlamellen 17, den Thermostatschalter 14 und die zweite der Kontaktlamellen 17. Zum Heizelement 8 ist für jede Wärmespeicherplatte 4 eine Signallampe 19 parallelgeschaltet. Eine weitere Signallampe 420 liegt zwischen einer Anschlussklemme des Heizelementes 8 und der einen Anschlussklemme 15 des Thermostatschalters 14.The electrical circuit of the elements described, which are assigned to each of the plates 4, is shown in FIG. 4. The circuit to the heating element 8 runs from a (all heating elements common) main switch 18 via a first of the contact fins 17, the thermostat switch 14 and the second of the contact fins 17. A signal lamp 19 is connected in parallel to the heating element 8 for each heat storage plate 4. Another signal lamp 420 is located between a connection terminal of the heating element 8 and the one connection terminal 15 of the thermostat switch 14.

Die Wirkungsweise ist für jede Speisewärmeplatte 4 die folgende.The mode of operation is as follows for each food heating plate 4.

Wenn die Platte 4 ganz in das Gehäuse 1 hineingeschoben ist, hält der Stift 10 den Thermostatschalter 14 mit seinen Anschlussklemmen 15 in Anlage an den Kontaktlamellen 17. Der Stromkreis über die Kontaktlamellen 17 und den Thermostatschalter 14 zum Heizelement 8 ist geschlossen. Die Platte 4 wird vom Heizelement 8 aufgeheizt, bis sie eine vorbestimmte Endtemperatur erreicht. Diese Endtemperatur der Platte 4 wird über den Wärmeleitstift 10 zum Thermostatschalter 14 übertragen, welcher öffnet und das Heizelement 8 ausschaltet.When the plate 4 is fully pushed into the housing 1, the pin 10 holds the thermostat switch 14 with its connecting terminals 15 in contact with the contact blades 17. The circuit via the contact blades 17 and the thermostat switch 14 to the heating element 8 is closed. The plate 4 is heated by the heating element 8 until it reaches a predetermined end temperature. This final temperature of the plate 4 is transferred via the heat-conducting pin 10 to the thermostat switch 14, which opens and switches off the heating element 8.

Während des Aufheizens, d. h. solange das Heizelement 8 eingeschaltet ist, leuchtet die Signallampe 19. Sie erlischt, wenn der Thermostatschalter 14 ausschaltet.During heating, i.e. H. As long as the heating element 8 is switched on, the signal lamp 19 lights up. It goes out when the thermostat switch 14 switches off.

Bei ausgeschaltetem Thermostatschalter 14, und solange die Anschlussklemmen 15 durch eine eingeschobene Platte 4 an den Kontaktlamellen 17 anliegen, leuchtet die Signallampe 20. Diese signalisiert die Bereitschaft der aufgeheizten eingeschobenen Platte 4.When the thermostat switch 14 is switched off and as long as the connecting terminals 15 are in contact with the contact blades 17 through an inserted plate 4, the signal lamp 20 lights up. This signals the readiness of the heated inserted plate 4.

Wenn die Platte 4 herausgezogen wird, wird der Wärmeübertragungsstift 10 durch die Feder 13 zurückgeschoben, so dass sich die Anschlussklemmen 15 des Thermostatschalters 14 von den Kontaktlamellen 17 trennen. Der Stromkreis zum Heizelement 8 sowie zu den Signallampen 19 und 20 wird damit unterbrochen.When the plate 4 is pulled out, the heat transfer pin 10 is pushed back by the spring 13, so that the connection terminals 15 of the thermostat switch 14 separate from the contact blades 17. The circuit to the heating element 8 and to the signal lamps 19 and 20 is thus interrupted.

In dem beschriebenen Apparat ist es auf einfache Weise möglich, nur diejenigen Speisewärmeplatten 4 aufzuheizen, welche für den Gebrauch gewünscht werden : Die nicht zu beheizenden Platten 4, die sich auch im Gehäuse 1 befinden, werden einfach um etwa 1 cm zurückgezogen ; dadurch werden die Anschlussklemmen 15 der betreffenden Thermostatschalter 14 von den Kontaktlamellen 17 getrennt, die den nicht zu beheizenden Platten 4 zugeordneten Heizelemente 8 bleiben ausgeschaltet.In the apparatus described, it is possible in a simple manner to heat only those food heating plates 4 which are desired for use: the plates 4 which are not to be heated and which are also in the housing 1 are simply pulled back by about 1 cm; as a result, the connection terminals 15 of the relevant thermostat switches 14 are separated from the contact blades 17, the heating elements 8 assigned to the plates 4 not to be heated remain switched off.

Es ist vorteilhaft, für die Platten 4 in der ganz eingeschobenen Stellung eine Rastvorrichtung vorzusehen. Eine solche kann beispielsweise die Form von eingepressten Nocken 21 (Fig. 2) in den Führungsschienen 7 haben, welche Nocken bei ganz eingeschobener Platte 4 in entsprechende Ausnehmungen in den Platten-Tragstäben 5 eingreifen.It is advantageous to provide a locking device for the plates 4 in the fully inserted position. Such can for example have the form of pressed-in cams 21 (FIG. 2) in the guide rails 7, which cams fully inserted plate 4 engage in corresponding recesses in the plate support rods 5.

Claims (6)

1. Apparatus for heating heat-accumulating food-warmer plates (4), including a housing (1) into which a plurality of food-warmer plates (4) may be slid through slots (3) in a wall (2) of the housing, and in which an electrical heating device is located, characterized in that the heating device comprises heating elements (8) which are each individually associated with a respective one of the food-warmer plates (4) in the housing (1) for heating this foodwarmer plate, in that a switch (15, 17) is provided for switching each heating element (8) on and off, said switch being actuated by the respective associated food-warmer plate (4) in the inserted position thereof, and in that each heating element (8) is arranged to also be switched off by an associated thermostatic switch (14) located in the housing (1), said thermostatic switch being controlled by a temperature sensor (10) which is arranged to sense the temperature of the respective associated food-warmer plate (4).
2. Apparatus according to claim 1, characterized in that each temperature sensor (10) comprises a heat transfer body which is arranged to be moved by the respective associated food- warmer plate (4) in the inserted position thereof and to which the thermostatic switch (14) is attached, and in that terminals (15) of the thermostatic switch (14) together with stationary contacts (17) form the respective first-named switch (15, 17).
3. Apparatus according to claim 1 or 2, characterized in that a pilot lamp (19) is associated with each heating element (8), said lamp being lit when the heating element (8) is switched on.
4. Apparatus according to any one of claims 1 to 3, characterized in that a pilot lamp (20) is associated with each heating element (8), said lamp being lit when both the first switch (15,17) is closed and at the same time the thermostatic switch (14) is open.
5. Apparatus according to any one of claims 1 to 4, characterized in that locking means (21) are mounted in the housing (1) for each food-warmer plate (4), so as to lock the food-warmer plate (4) in the fully inserted position.
6. Apparatus according to any one of claims 1 to 5, characterized in that each heating element (8) is mounted in the housing (1) beneath the respective associated food-warmer plate (4), and an associated heat radiation shield (9) is provided beneath the heating element (8).
EP84107169A 1983-07-13 1984-06-22 Apparatus for heating hot plates Expired EP0134929B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84107169T ATE29957T1 (en) 1983-07-13 1984-06-22 DEVICE FOR HEATING FOOD PLATES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3834/83 1983-07-13
CH3834/83A CH661400A5 (en) 1983-07-13 1983-07-13 APPARATUS FOR HEATING HEATING PLATES.

Publications (2)

Publication Number Publication Date
EP0134929A1 EP0134929A1 (en) 1985-03-27
EP0134929B1 true EP0134929B1 (en) 1987-09-30

Family

ID=4264469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107169A Expired EP0134929B1 (en) 1983-07-13 1984-06-22 Apparatus for heating hot plates

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US (1) US4580035A (en)
EP (1) EP0134929B1 (en)
AT (1) ATE29957T1 (en)
CH (1) CH661400A5 (en)
DE (1) DE3466473D1 (en)

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Also Published As

Publication number Publication date
US4580035A (en) 1986-04-01
ATE29957T1 (en) 1987-10-15
EP0134929A1 (en) 1985-03-27
DE3466473D1 (en) 1987-11-05
CH661400A5 (en) 1987-07-15

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