EP0249721A1 - Electric cooking plate - Google Patents

Electric cooking plate Download PDF

Info

Publication number
EP0249721A1
EP0249721A1 EP87106190A EP87106190A EP0249721A1 EP 0249721 A1 EP0249721 A1 EP 0249721A1 EP 87106190 A EP87106190 A EP 87106190A EP 87106190 A EP87106190 A EP 87106190A EP 0249721 A1 EP0249721 A1 EP 0249721A1
Authority
EP
European Patent Office
Prior art keywords
hotplate
temperature sensor
underside
switch housing
cover
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.)
Granted
Application number
EP87106190A
Other languages
German (de)
French (fr)
Other versions
EP0249721B1 (en
Inventor
Felix Schreder
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT87106190T priority Critical patent/ATE80934T1/en
Publication of EP0249721A1 publication Critical patent/EP0249721A1/en
Application granted granted Critical
Publication of EP0249721B1 publication Critical patent/EP0249721B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/105—Constructive details concerning the regulation of the temperature
    • 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
    • H05B3/70—Plates of cast metal

Definitions

  • the invention relates to an electric hotplate with a hotplate body which is provided on its underside facing away from a cooking surface around a central zone with at least one heating resistor and has at least one temperature limiter which is located in the heated area on the underside of the hotplate body with a switch housing receiving a limiter switch and one Has temperature sensor.
  • the invention has for its object to provide an electric hotplate of the type mentioned, in which on the one hand a space-saving arrangement of the temperature limiter is ensured with a simple structure and on the other hand the most accurate switching function of this temperature limiter is guaranteed with all thermal loads occurring.
  • the temperature sensor is designed as an exposed outside the switch housing expansion rod sensor, which is completely outside the generally unheated middle zone and at a distance from the underside of the hotplate body approximately parallel to this lies.
  • a temperature limiter which has an outer tube as a temperature sensor and an inner rod with different specific thermal expansion coefficients therein, usually has a snap switch as a limiter switch, this can nevertheless be used to protect against thermal loads set to a snap switch influenced by a bimetal in a more favorable position compared to the heated area of the hotplate, since the relatively long and high thermal forces emitting rod sensor can extend relatively far away from the switch housing.
  • the switch housing therefore does not need to be arranged in the relatively narrow area of the unheated central zone, so that there is space here for at least one further temperature sensor, assembly parts of the electric hotplate or other parts.
  • the configuration of the temperature sensor according to the invention can also assume a position in which it is practically continuously exposed to the heated area on the underside of the hotplate body from its end entering the switch housing to its free end.
  • the switch housing is expediently completely outside the cover.
  • the cover could have at least one window-like opening in the area of the switch housing, however, the switch housing can be shielded particularly well from the heat radiated from the underside of the hotplate body if an essentially completely closed wall section of the cover is provided between the switch housing and the underside of the hotplate body is.
  • This wall section, on which the switch housing with its associated side rests essentially over the entire surface, is usually made of sheet steel, so that the heat brought up to the intermediate wall section by heat conduction is dissipated from the latter essentially over the entire cover is, especially if this is otherwise apart from in the area of the intermediate wall section at a distance from the heated area of the underside of the hotplate body and is therefore cooler.
  • the switch housing itself consists of, for example, a ceramic insulating material, in particular steatite.
  • the inventive design it is even possible to support the switch housing at least approximately against the underside of the hotplate body, in particular against an insulating compound embedding the heating resistor, which leads to a very space-saving design without the risk that the function of the limiter switch can be impaired.
  • the cover In order not to have to support the switch housing directly on this underside, for example due to a window opening in the cover, the cover has on its underside a recess which accommodates the switch housing, the flat bottom wall of which rests approximately on the underside of the hotplate body.
  • the switch housing thus projects beyond the underside of the hotplate body only by its housing height and by the thickness of this bottom wall.
  • the temperature sensor can be guided as tightly as possible against air currents and as close as possible to the inside of the cover near the switch housing, the temperature sensor is inserted through an opening in the cover, which is adapted as closely as possible to the outer circumference of the temperature sensor, but is so far that the assembly of the temperature limiter is possible without difficulty.
  • the connecting line connecting the temperature limiter to the heating resistors is also expediently passed through a through opening in the cover on the inside thereof, so that the connecting lugs of the switch housing also lie outside the space covered by the cover.
  • the switch housing is on the outside or underside of the cover, the arrangement can be made such that the exposed or bare and non-insulated sections of the connecting leads that are connected to the switch housing are extremely short and only a correspondingly short bridge form between the switch housing and an insulating body made of ceramic, such as steatite, inserted into the through opening.
  • the temperature limiter is held by at least one plug-in holder on the hotplate, in particular exclusively on the cover, so that no separate fastening or clamping means are required to fix the switch housing.
  • the temperature limiter or the scarf tergeophuse can be hung up in a simple manner practically between the through opening for the temperature sensor and the through opening for the insulating body on two sides facing away from each other, so that no fasteners attack the switch housing itself, but at most by the resilient suspension against the underside of the associated wall section the cover is applied with low system pressure.
  • the sections of the connecting lines lying between the switch housing and the insulating body can be used by appropriate shaping.
  • the central axis of the temperature sensor lies approximately tangentially to an imaginary circle placed around the central axis of the hotplate body, the switch housing being approximately at the center of its width to be measured in the longitudinal direction of the temperature sensor in the area of the axial plane perpendicular to the central axis of the temperature sensor of the hotplate body can lie, which then essentially also applies to the receiving recess in the cover, so that its edge walls penetrated by the temperature sensor and by the connecting lines are provided parallel to this axial plane and at right angles to the temperature sensor.
  • the cover is based on the central axis of the hotplate body - directly adjacent to the radially inner as well as immediately adjacent to the radially outer side of the receiving recess or of the switch housing on at least one projecting over the underside of the hotplate body, supported by this one-piece ring flange, as a result of which there are also relatively strongly changing profiles in this area cover.
  • the switch housing can be open on its full inner width on one side, which is provided at the same time for mounting the switch parts in it, the switch housing then expediently with the edge surface of this open side, opposite which the switch parts and the associated end of the temperature sensor stand back, the underside of the hotplate body faces or is supported on this underside or on the associated wall section of the cover.
  • On the edge surface protruding spacers can be provided, so that there is a gap section between the remaining edge surface and the associated contact surface of the electric hotplate, which allows ventilation of the interior of the switch housing.
  • the switch housing can also have a housing cover which closes the latter on the open side, in particular a flat or plate-shaped flat cover, which forms a component integrated with the switch housing.
  • the temperature limiter can be designed essentially as described in DE-PS 2422625, to which reference is made for further details.
  • the design according to the invention is particularly suitable for those electric hotplates in which the hotplate body, in particular in the area thereof Underside, a further temperature sensor of a power control device is provided and are therefore suitable, at least for a short time, for relatively high thermal loads. It has been shown that there are temperature differences of around 140 ° C. between the temperature sensor and the switch housing during operation of the electric hotplate and that the temperature limiter can therefore be adjusted to a much higher switch-off temperature without the risk that switch parts will be damaged at these high limit temperatures can.
  • the hotplate body in the manner of an automatic hotplate, has the last-mentioned further temperature sensor in the form of a sensor capsule lying directly on the underside of the cooking vessel, in an opening provided in its center, these additional temperature sensors and the temperature limiter are suitable even for hotplates due to the inventive design relatively small diameter not in the way, but also spatially well completely separated from each other. While the further temperature sensor decreases the temperature directly on the cooking vessel, the temperature sensor of the temperature limiter decreases the temperature directly from the underside of the heated zone of the hotplate body.
  • an electric hotplate 1 has a circular or annular, solid hotplate body made of cast material 2, the annular flat top of which forms a cooking surface 3 and in the underside 4 at least one heating resistor, in particular at least two heating resistors 7 , 8 are inserted in such a way that the hotplate body 2 forms an annular, heated region 5 essentially adjoining its outer circumference and in the center a zone 6, which is delimited by the latter and is not directly heated.
  • the heating resistors 7, 8 lying in one another in spirals about the central axis 15 of the hotplate body 2 in a common plane are arranged in corresponding spiral grooves 9 in an area of the underside 4 of the hotplate body 2 closest to the cooking surface 3, with adjacent spiral grooves 9 being relatively thin Spiral bars 10 are separated from each other.
  • the heating resistors 7, 8 are embedded in the spiral grooves 9 with respect to the hotplate body 2 without contact in an insulating compound 11, which also covers the lower end edges of the spiral webs 11 with a thin layer 12 and has a concave and cross-sectionally penetrating section between two adjacent spiral webs 10 therefore against forms recessed lower surface over the end edges of the spiral webs 10.
  • the heated area 5 is delimited on the inner circumference by an annular flange 13 of the hotplate body 2 projecting further downward than the spiral webs 10 and on the outer circumference by an outer ring flange 14 projecting even further downward, which is slightly different from the outer circumference of the hotplate body 2 adjoining the cooktop 3 is offset inwards and carries a support ring 16 for supporting the electric hotplate in the region of an opening of a hob in an outer annular shoulder formed thereby.
  • the underside 4 of the hotplate body 2 is almost complete, namely in a ring zone extending from the outer ring flange 14 to the inner ring flange 13, covered by a cover-like cover 17 made of thin sheet metal, which bears essentially over the entire surface of the lower end edges of the ring flanges 13, 14 and thereby enclosing a corresponding annular space with the ring flanges 13, 14 and the underside of the hotplate body 2.
  • the cover 17 On the inner circumference of the inner ring flange 13, the cover 17 has a collar which is drawn towards the cooking surface 3 and surrounds a central opening and is formed at two diametrically opposed locations to form radially inward fastening tabs 18, which also have eye-like projections of the inner ring flange 13 used screws for securing the cover 17 are secured against the hotplate body 2.
  • the cover 17, which can also be supported only on the inner circumference of the outer ring flange 14, has a flange edge 19 lying in one plane, with which it lies against the ring flange 14.
  • a temperature sensor 21 (not shown in FIG. 2) of a hydraulic expansion system arranged so resiliently that it protrudes upwards over the cooking surface 3 in the relieving state and is pressed downward against the spring force by the placement of a cooking vessel.
  • This temperature sensor 21, which is stop-limited in its upper end position, is connected via a capillary tube 22, which is guided away from its underside, to the expansion element 24 of a power control device 23, for example formed by a pressure cell, for operating the electric hotplate, the expansion element 24 acting on a switch 25 of the power control device 23, which can be set to different power ranges of the electric hotplate with an actuating button 26 arranged on an adjusting shaft.
  • a temperature limiter 27 is also provided, in which the temperature sensor 28 and the switch housing 29 forming the switch head, including the limiter switch 30 located therein, are structurally integrated with one another and form a closed structural unit.
  • the switch housing 29, which is approximately oblong in plan view and rounded in two corner areas with relatively large radii of curvature, has on one long side adjacent to the associated rounding the rod-shaped and rectilinear temperature sensor 28 protruding approximately at right angles over this long side, the length of which is greater than that of the switch housing.
  • the temperature sensor 28 consists essentially of a metallic outer tube 31, which has one at its associated end seen flange plate 33 is fastened in a corresponding slot of the switch housing 29 and in this outer tube 31 arranged, non-metallic inner rod 32 of very low expansion coefficient, which is adjustable with its outer end at the free end of the outer tube 31 and with its inner end lying in the switch housing 29 is supported at a pressure point for actuating the limiter switch 30.
  • the central axis 35 of the temperature sensor 28 lies at right angles to an axial plane 34 of the central axis 15, which extends approximately through the middle between the longitudinal boundaries of the switch housing 29, the free end of the temperature sensor 28 reaching almost to the inner circumference of the outer ring flange 14, but without contact with it is.
  • the central axis 35 is also parallel to the cooking surface 3 or to the underside 4 of the hotplate body 2, but the temperature sensor 28 is essentially contact-free over its entire length with respect to this underside 2 and the cover 17 and is relatively close to a wall section parallel to it the cover 17 is.
  • the temperature sensor 28 is located essentially over its entire length within the space covered by the cover 17, while the switch housing 29 lies completely outside of this space on the underside of the cover 17, namely in a recess 36 molded into it.
  • This recess 36 has a flat wall section 37 as the bottom wall, on which the switch housing 29 rests with its upper side essentially over the entire surface.
  • On the wall section 37 close four transversely to this down, on the long sides of a roof th rectangle or square lying edge walls 38 to 41, which are inclined at acute angles downwards and outwards in cross section according to FIGS. 3 and 4 and have different heights.
  • the two edge walls 38, 39 which are approximately at right angles to the temperature sensor 28 have the greatest height, while the edge wall 41 lying at right angles thereto and closer to the central axis 15 has the smallest height, namely only from the level of the underside 4 of the heated area 5 to Level of the front edge of the inner ring flange 13 is sufficient; the opposite edge wall 40 has an intermediate height and merges with the shoulder 19 into the flange 19.
  • the width of the wall section 37 measured in the longitudinal direction of the switch housing 29 is only very slightly larger than the length of the switch housing 29, while the extension of the wall section 37 measured in the longitudinal direction of the temperature sensor 28 is larger compared to the associated width of the switch housing 29, but the switch housing 29 is immediate is adjacent to the edge wall 38 associated with the temperature sensor 28.
  • this edge wall 38 Provided in this edge wall 38 is a relatively narrow passage opening 42, which is adapted to the outer cross section of the temperature sensor 28, through which the temperature sensor 28 is inserted immediately adjacent to the switch housing 29 and on the limitation of which the temperature sensor 28 is supported in a point-like manner.
  • a larger through opening 43 is provided, into which an insulating piece 44 is inserted with almost no play, with a shaft section which on the inside of the recess 36 has a head which is widened relative to the through opening 43 and which can be located directly adjacent to the edge wall 39.
  • two connecting lines 45 are passed such that their exposed, double-angled section 46 between the insulating piece 44 and the switch housing 29 are relatively short, namely in the longitudinal direction of the temperature sensor 28 have an expansion that is only slightly larger than that Length of connecting lugs 47, which project beyond the side of the switch housing 29 remote from the temperature sensor 28, on both sides adjacent to its narrow sides and parallel to one another.
  • the insulating piece 44 is secured in its position in relation to the connecting lines 45 by bends of these connecting lines 45 lying directly adjacent to its two ends, the sections 46 adjacent to the insulating piece 44 being separated from one another and then angled once more in the direction of the switch housing 29.
  • the sections of the connecting lines 45 lying within the cover 17 are connected to connecting pins at the ends of the heating resistors 7, 8, which protrude downward beyond the insulating compound 11 and are located close to the recess 36.
  • the switch housing 29 of the temperature limiter 27 has a base body 48 which receives the limiter switch 30 and the flange plate 33 in a completely recessed manner, which is open on its upper side for inserting all the switch parts and the flange plate 33 and can be closed with a housing cover 49 which has the same layout.
  • the switch housing 29 extends at most up to the underside of the cover 17 formed by the flange edge 19 or projects only extremely slightly downwards over it.
  • the flat wall section 37 lies only linearly in the region of the end edges of the spiral webs 10 or the layer 12 and is contact-free in the region of the spiral grooves 9 with the formation of laterally open channels with respect to the insulating compound 11.
  • the configuration according to the invention or a similar configuration is also advantageously suitable for coupling the temperature sensor 28 to the area to be measured in a particularly closely or intensely heat-conducting manner by means of additional measures.
  • the temperature sensor 28 can be provided under the cover 17 with a baffle plate made of stainless steel or the like, which protrudes substantially beyond its outer shape and expediently closely surrounds the temperature sensor 28 approximately over its entire length and approximately parallel to the underside of the hotplate body 2 on both sides of the temperature sensor 28 protrudes.
  • This baffle 50 can be pushed in the longitudinal direction onto the temperature sensor 28 in a simple manner in that it is provided with slits lying one behind the other transversely to the temperature sensor 28 and sections lying between adjacent slits are alternately bent out of the plane of the baffle 50 in a channel-like manner on both sides, so that a plug opening for the temperature sensor 28 is formed in the longitudinal view of the temperature sensor 28 over the circumference.
  • the wings of the guide plate 50 projecting on both sides above the temperature sensor 28 can lie in a common plane or can be bent out of this plane in such a way that they are either closer to the underside 4 of the hotplate body 2 or even lie against it over a large area or that they are further away from it Bottom 4 are provided close to the cover 7, depending on how the thermal coupling should be adjusted.
  • the outer edge of the guide plate 50 can also be designed so that it is one Opposing surface of the rest of the hotplate, for example, lies directly adjacent to the inner surface of the outer ring flange 14, so that the temperature sensor 28 is secured against lateral deflections by a stop on this counter surface.
  • an auxiliary contact for a hot display or as a hot display can also be provided, so that the individual contacts can be dimensioned weaker due to lower power loads. This additional auxiliary contact closes when the temperature rises.
  • the design according to the invention is also suitable for those electric hotplates which do not have an automatic temperature sensor 21 in the center, but in which the breakthrough-free central zone 6 is occupied by other components, such as temperature switches, fastening elements or the like.

Abstract

An electric hotplate (1) with a temperature sensor (21) of a power control device provided in the center of the cooking surface (3) has on the underside of area (5) of hotplate body (2) directly heated by heating resistors (7, 8) a thermal cutout (27) with rod-like temperature sensors (28) projecting freely from a switch casing (29). Switch casing (29) is located outside a cover (17) of underside (4) of hotplate body (2) and temperature sensor (28) is located within said cover. In the case of high switching precision of thermal cutout (27), the limiter switch is still not damaged if the thermal cutout is set to relatively high cut-off temperatures.

Description

Die Erfindung betrifft eine Elektrokochplatte mit einem Koch­plattenkörper, der an seiner von einer Kochfläche abgekehrten Unterseite um eine Mittelzone mit mindestens einem Heizwider­stand versehen ist und mindestens einen Temperaturbegrenzer aufweist, der mit einem einen Begrenzerschalter aufnehmenden Schaltergehäuse im beheizten Bereich an der Unterseite des Kochplattenkörpers liegt und einen Temperaturfühler aufweist.The invention relates to an electric hotplate with a hotplate body which is provided on its underside facing away from a cooking surface around a central zone with at least one heating resistor and has at least one temperature limiter which is located in the heated area on the underside of the hotplate body with a switch housing receiving a limiter switch and one Has temperature sensor.

Es wurde bereits versucht, Temperaturbegrenzer als Temperatur-­Begrenzungsschutz unmittelbar an der Unterseite des beheizten Bereiches des Kochplattenkörpers anzuordnen, insbesondere weil angesichts der engen räumlichen Verhältnisse,insbesondere bei kleinen Kochplatten, die Unterbringung schwierig sein kann. Hierbei wurden hinsichtlich der Funktion des Temperatur-­Begrenzers auch gute Erfahrungen gemacht. Es hat sich jedoch gezeigt, daß insbesondere bei leistungsstarken Elektro­kochplatten, wie sie beispielsweise häufig durch soge­nannte Automatik-Elektrokochplatten gebildet sind, bei zu naher Lage des meist durch einen Schnappschalter ge­bildeten Begrenzerschalters beim beheizten Bereich bzw. bei den Heizwiderständen, Schwierigkeiten hinsichtlich der thermischen Belastung des Schalters und daraus folgend hinsichtlich dessen Funktion entstehen können. Insbesondere kann sich durch schlagartige hohe Er­hitzung des Begrenzerschalters die in der Regel vor­handene Schalterfeder in ihrer Federcharakteristik ändern, was zu einer Verjustierung des Schalters führt.Attempts have already been made to arrange temperature limiters as temperature limitation protection directly on the underside of the heated area of the hotplate body, in particular because, given the narrow spatial conditions, in particular in the case of small hotplates, the accommodation can be difficult. Good experiences have also been made with regard to the function of the temperature limiter. However, it has shown that especially with high-performance electric hot plates, such as are often formed by so-called automatic electric hot plates, when the limit switch, which is usually formed by a snap switch, is too close to the heated area or the heating resistors, difficulties with regard to the thermal load on the switch and consequently can arise with regard to its function. In particular, sudden spring heating of the limiter switch can change the spring characteristic of the switch spring that is usually present, which leads to an adjustment of the switch.

Der Erfindung liegt die Aufgabe zugrunde, eine Elektro­kochplatte der genannten Art zu schaffen, bei welcher einerseits bei einfachem Aufbau eine raumsparende An­ordnung des Temperaturbegrenzers und andererseits eine möglichst genaue Schaltfunktion dieses Temperaturbe­grenzers bei allen auftretenden thermischen Belastungen gewährleistet ist.The invention has for its object to provide an electric hotplate of the type mentioned, in which on the one hand a space-saving arrangement of the temperature limiter is ensured with a simple structure and on the other hand the most accurate switching function of this temperature limiter is guaranteed with all thermal loads occurring.

Zur Lösung dieser Aufgabe ist bei einer Elektrokoch­platte der eingangs beschriebenen Art gemäß der Er­findung vorgesehen, daß der Temperaturfühler als außer­halb des Schaltergehäuses freiliegender Dehnstabfühler ausgebildet ist, der vollständig außerhalb der in der Regel unbeheizten Mittelzone und mit Abstand von der Unterseite des Kochplattenkörpers etwa parallel zu die­ser liegt. Obwohl auch ein solcher, als Temperaturfühler ein Außenrohr und einen darin liegenden Innenstab unter­schiedlicher spezifischer Wärme-Ausdehnungskoifizienten aufweisender Temperaturbegrenzer meist als Begrenzer­schalter einen Schnappschalter aufweist, kann dieser doch zum Schutz vor thermischen Belastungen im Gegen­ satz zu einem von einem Bimetall beeinflußten Schnapp­schalter in eine gegenüber dem beheizten Bereich der Kochplatte günstigere Lage verlegt werden, da der relativ lange und bei jeglicher thermischen Belastung hohe Betätigungskräfte abgebende Stabfühler sich rela­tiv weit weg vom Schaltergehäuse erstrecken kann. Das Schaltergehäuse braucht daher nicht in dem relativ engen Bereich der unbeheizten Mittelzone angeordnet zu werden, so daß hier Raum für mindestens einen wei­teren Temperaturfühler, Montageteile der Elektrokoch­platte oder andere Teile bleibt. Auch kann durch die erfindungsgemäße Ausbildung der Temperaturfühler eine Lage einnehmen, in welcher er praktisch von seinem in das Schaltergehäuse eintretenden Ende bis zu seinem freien Ende ununterbrochen gleichmäßig dem beheizten Bereich an der Unterseite des Kochplattenkörpers aus­gesetzt ist.To solve this problem it is provided in an electric hot plate of the type described above according to the invention that the temperature sensor is designed as an exposed outside the switch housing expansion rod sensor, which is completely outside the generally unheated middle zone and at a distance from the underside of the hotplate body approximately parallel to this lies. Although such a temperature limiter, which has an outer tube as a temperature sensor and an inner rod with different specific thermal expansion coefficients therein, usually has a snap switch as a limiter switch, this can nevertheless be used to protect against thermal loads set to a snap switch influenced by a bimetal in a more favorable position compared to the heated area of the hotplate, since the relatively long and high thermal forces emitting rod sensor can extend relatively far away from the switch housing. The switch housing therefore does not need to be arranged in the relatively narrow area of the unheated central zone, so that there is space here for at least one further temperature sensor, assembly parts of the electric hotplate or other parts. The configuration of the temperature sensor according to the invention can also assume a position in which it is practically continuously exposed to the heated area on the underside of the hotplate body from its end entering the switch housing to its free end.

Es ist zwar denkbar, den Dehnstab-Temperaturbegrenzer verdeckt innerhalb der Elektrokochplatten-Einheit an­zuordnen, jedoch wären in diesem Fall bei leistungs­starken Elektrokochplatten aufwendige Maßnahmen zur Belüftung des Schaltergehäuses erforderlich. Dies kann nach einem weiteren Merkmal der Erfindung auf über­raschend einfache Weise dadurch vermieden werden, daß bei einer Elektrokochplatte, deren Unterseite mindestens teilweise mit einer Abdeckung versehen ist, das Schalter­gehäuse wenigstens teilweise außerhalb und der Tempe­raturfühler im wesentlichen innerhalb der Abdeckung, also innerhalb des von der Abdeckung und der Untersei­te des Kochplattenkörpers umschlossenen Raumes liegt, so daß das Schaltergehäuse ohne weiteres einer wirkungs­vollen Luftkühlung ausgesetzt ist, während der Tempe­raturfühler gegenüber der Belüftung abgedeckt ist.Although it is conceivable to arrange the expansion rod temperature limiter concealed within the electric hotplate unit, in this case complex measures for venting the switch housing would be necessary in the case of powerful electric hotplates. According to a further feature of the invention, this can be avoided in a surprisingly simple manner in that, in the case of an electric hotplate whose underside is at least partially provided with a cover, the switch housing is at least partially outside and the temperature sensor essentially inside the cover, that is to say inside the cover Cover and the underside of the hotplate body is enclosed space, so that the switch housing is easily exposed to effective air cooling, while the temperature sensor is covered from the ventilation.

Zweckmäßig liegt das Schaltergehäuse vollständig außer­halb der Abdeckung. Die Abdeckung könnte im Bereich des Schaltergehäuses mindestens einen beispielsweise fen­sterartigen Durchbruch aufweisen, jedoch kann das Schal­tergehäuse gegenüber der von der Unterseite des Koch­plattenkörpers abgestrahlten Wärme besonders gut abge­schirmt werden, wenn zwischen dem Schaltergehäuse und der Unterseite des Kochplattenkörpers ein im wesent­lichen vollständig geschlossener Wandabschnitt der Ab­deckung vorgesehen ist. Dieser Wandabschnitt, an wel­chem das Schaltergehäuse mit seiner zugehörigen Seite im wesentlichen ganzflächig anliegt, besteht in der Regel wie auch die Abdeckung aus Stahlblech, so daß die durch Wärmeleitung an den Zwischen-Wandabschnitt heran-geführte Wärme von diesem im wesentlichen über die gesamte Abdeckung abgeführt wird, insbesondere wenn die­se außer im Bereich des Zwischen-Wandabschnittes an­sonsten im Abstand vom beheizten Bereich der Unterseite des Kochplattenkörpers liegt und dadurch kühler ist. Das Schaltergehäuse selbst besteht aus einem beispiels­weise keramischen Isolierwerkstoff, insbesondere Steatit.The switch housing is expediently completely outside the cover. The cover could have at least one window-like opening in the area of the switch housing, however, the switch housing can be shielded particularly well from the heat radiated from the underside of the hotplate body if an essentially completely closed wall section of the cover is provided between the switch housing and the underside of the hotplate body is. This wall section, on which the switch housing with its associated side rests essentially over the entire surface, is usually made of sheet steel, so that the heat brought up to the intermediate wall section by heat conduction is dissipated from the latter essentially over the entire cover is, especially if this is otherwise apart from in the area of the intermediate wall section at a distance from the heated area of the underside of the hotplate body and is therefore cooler. The switch housing itself consists of, for example, a ceramic insulating material, in particular steatite.

Durch die erfindungsgemäße Ausbildung ist es sogar mög­lich, das Schaltergehäuse wenigstens annähernd gegen die Unterseite des Kochplattenkörpers, insbesondere gegen eine den Heizwiderstand einbettende Isoliermasse abzustützen, was zu einer sehr raumsparenden Ausbildung ohne die Gefahr führt, daß der Begrenzerschalter in seiner Funktion beeinträchtigt werden kann. Um das Schal­tergehäuse, beispielsweise durch einen Fensterdurch­bruch in der Abdeckung, nicht unmittelbar an dieser Unterseite abstützen zu müssen, weist die Abdeckung an ihrer Unterseite eine das Schalter-Gehäuse aufnehmende Vertiefung auf, deren ebene Bodenwand annähernd an der genannten Unterseite des Kochplattenkörpers anliegt.Due to the inventive design, it is even possible to support the switch housing at least approximately against the underside of the hotplate body, in particular against an insulating compound embedding the heating resistor, which leads to a very space-saving design without the risk that the function of the limiter switch can be impaired. In order not to have to support the switch housing directly on this underside, for example due to a window opening in the cover, the cover has on its underside a recess which accommodates the switch housing, the flat bottom wall of which rests approximately on the underside of the hotplate body.

Das Schaltergehäuse steht also über die Unterseite des Kochplattenkörpers nur um seine Gehäusehöhe sowie um die Dicke dieser Bodenwand vor.The switch housing thus projects beyond the underside of the hotplate body only by its housing height and by the thickness of this bottom wall.

Damit der Temperaturfühler möglichst dicht gegen Luftströmungen sowie möglichst nahe beim Schalterge­häuse an die Innenseite der Abdeckung geführt werden kann, ist der Temperaturfühler durch eine Durchtritts­öffnung in der Abdeckung gesteckt, die möglichst eng an den Außenumfang des Temperaturfühlers angepaßt, je­doch so weit ist, daß die Montage des Temperaturbe­grenzers ohne Schwierigkeiten möglich ist.So that the temperature sensor can be guided as tightly as possible against air currents and as close as possible to the inside of the cover near the switch housing, the temperature sensor is inserted through an opening in the cover, which is adapted as closely as possible to the outer circumference of the temperature sensor, but is so far that the assembly of the temperature limiter is possible without difficulty.

Auch die den Temperaturbegrenzer mit den Heizwider­ständen verbindende Anschlußleitung wird zweckmäßig durch eine Durchgangsöffnung in der Abdeckung an deren Innenseite geführt, so daß auch die Anschlußfahnen des Schaltergehäuses außerhalb des von der Abdeckung abgedeckten Raumes liegen. Obwohl das Schaltergehäuse also an der Außen- bzw. der Unterseite der Abdeckung liegt, kann dadurch die Anordnung so getroffen werden, daß die an das Schaltergehäuse anschließenden, frei­liegenden bzw. blanken und nicht isolierten Abschnitte der Anschlußleitungen äußerst kurz sind und lediglich eine entsprechend kurze Brücke zwischen dem Schalter­gehäuse und einem in die Durchgangsöffnung einge­setzten Isolierkörper aus Keramik, wie Steatit,bilden.The connecting line connecting the temperature limiter to the heating resistors is also expediently passed through a through opening in the cover on the inside thereof, so that the connecting lugs of the switch housing also lie outside the space covered by the cover. Thus, although the switch housing is on the outside or underside of the cover, the arrangement can be made such that the exposed or bare and non-insulated sections of the connecting leads that are connected to the switch housing are extremely short and only a correspondingly short bridge form between the switch housing and an insulating body made of ceramic, such as steatite, inserted into the through opening.

Eine besonders vorteilhafte Weiterbildung des Erfindungs­gegenstandes besteht darin, daß der Temperaturbegrenzer durch mindestens eine Steckhalterung an der Kochplatte, insbesondere ausschließlich an der Abdeckung gehaltert ist, so daß keinerlei gesonderte Befestigungs- oder Spannmittel zur Festlegung des Schaltergehäuses er­forderlich sind. Der Temperaturbegrenzer bzw. das Schal­ tergehäuse kann dabei in einfacher Weise praktisch zwischen der Durchtrittsöffnung für den Temperatur­fühler und der Durchgangsöffnung für den Isolierkör­per an zwei voneinander abgekehrten Seiten aufgehängt werden, so daß an dem Schaltergehäuse selbst keiner­lei Befestigungsmittel angreifen, sondern dieses allen­falls durch die federnde Aufhängung gegen die Unter­seite des zugehörigen Wandabschnittes der Abdeckung mit geringem Anlagedruck angelegt wird. Für diese federnde Anlage, aber auch für eine gewisse Dämpfung der Aufhängung des Temperaturbegrenzers,können die zwischen dem Schaltergehäuse und dem Isolierkörper lie­genden Abschnitte der Anschlußleitungen durch ent­sprechende Formgebung herangezogen werden.A particularly advantageous development of the subject matter of the invention is that the temperature limiter is held by at least one plug-in holder on the hotplate, in particular exclusively on the cover, so that no separate fastening or clamping means are required to fix the switch housing. The temperature limiter or the scarf tergehäuse can be hung up in a simple manner practically between the through opening for the temperature sensor and the through opening for the insulating body on two sides facing away from each other, so that no fasteners attack the switch housing itself, but at most by the resilient suspension against the underside of the associated wall section the cover is applied with low system pressure. For this resilient system, but also for a certain damping of the temperature limiter suspension, the sections of the connecting lines lying between the switch housing and the insulating body can be used by appropriate shaping.

Zur noch besseren, raumsparenden Unterbringung des Temperaturbegrenzers liegt die Mittelachse des Tempe­raturfühlers etwa tangential zu einem um die Zentral­achse des Kochplattenkörpers gelegten gedachten Kreis, wobei das Schaltergehäuse etwa mit der Mitte seiner in Längsrichtung des Temperaturfühlers zu messenden Breite im Bereich der zur Mittelachse des Temperatur­fühlers rechtwinkligen Axialebene des Kochplatten­körpers liegen kann, was dann im wesentlichen auch für die Aufnahme-Vertiefung in der Abdeckung gilt, so daß deren vom Temperaturfühler und von den Anschluß­leitungen durchsetzte Randwandungen parallel zu dieser Axialebene und rechtwinklig zum Temperaturfühler vor­gesehen sind.For an even better, space-saving accommodation of the temperature limiter, the central axis of the temperature sensor lies approximately tangentially to an imaginary circle placed around the central axis of the hotplate body, the switch housing being approximately at the center of its width to be measured in the longitudinal direction of the temperature sensor in the area of the axial plane perpendicular to the central axis of the temperature sensor of the hotplate body can lie, which then essentially also applies to the receiving recess in the cover, so that its edge walls penetrated by the temperature sensor and by the connecting lines are provided parallel to this axial plane and at right angles to the temperature sensor.

Um den Bereich der Abdeckung, in welchem der gegenüber dem Kochplattenkörper völlig berührungsfreie Tempe­raturbegrenzer angeordnet ist, auch bei sehr dünnwan­diger Ausbildung der Abdeckung möglichst formstabil ausbilden zu können, ist die Abdeckung - bezogen auf die Zentralachse des Kochplattenkörpers - unmittelbar benachbart zur radial inneren wie auch unmittelbar be­nachbart zur radial äußeren Seite der Aufnahmever­tiefung bzw. des Schaltergehäuses an mindestens einem über die Unterseite des Kochplattenkörpers vorstehenden, mit diesem einteiligen Ringflansch abgestützt, wodurch sich in diesem Bereich auch relativ stark wechselnde Profilierungen der Abdeckung ergeben.In order to be able to form the area of the cover in which the temperature limiter which is completely non-contact with respect to the hotplate body is as dimensionally stable as possible, even with a very thin-walled design of the cover, the cover is based on the central axis of the hotplate body - directly adjacent to the radially inner as well as immediately adjacent to the radially outer side of the receiving recess or of the switch housing on at least one projecting over the underside of the hotplate body, supported by this one-piece ring flange, as a result of which there are also relatively strongly changing profiles in this area cover.

Das Schaltergehäuse kann an einer Seite, die gleich­zeitig zur Montage der in ihm liegenden Schalterteile durch Einstecken vorgesehen ist, auf seiner vollen Innenweite offen sein, wobei das Schaltergehäuse dann zweckmäßig mit der Kantenfläche dieser offenen Seite, gegenüber welcher die Schalterteile und das zugehörige Ende des Temperaturfühlers zurückstehen, der Untersei­te des Kochplattenkörpers zugekehrt ist bzw. an dieser Unterseite oder am zugehörigen Wandungsabschnitt der Abdeckung abgestützt ist. An der Kantenfläche können noppenförmig vorstehende Distanzglieder vorgesehen sein, so daß sich ein Spaltabschnitt zwischen der übrigen Kantenfläche und der zugehörigen Anlagefläche der Elektro­kochplatte ergibt, welche eine Belüftung des Innenraumes des Schaltergehäuses ermöglicht. Das Schaltergehäuse kann aber auch außer dem so angeordneten und ausgebil­deten Gehäusekörper einen diesen an der offenen Seite schließenden, insbesondere flachen bzw. plattenförmig ebenen Gehäusedeckel aufweisen, welcher einen mit dem Schaltergehäuse integrierten Bauteil bildet. Der Tempe­raturbegrenzer kann im wesentlichen wie in der DE-PS 2422625 beschrieben ausgebildet sein, auf welche wegen weiterer Einzelheiten Bezug genommen wird.The switch housing can be open on its full inner width on one side, which is provided at the same time for mounting the switch parts in it, the switch housing then expediently with the edge surface of this open side, opposite which the switch parts and the associated end of the temperature sensor stand back, the underside of the hotplate body faces or is supported on this underside or on the associated wall section of the cover. On the edge surface protruding spacers can be provided, so that there is a gap section between the remaining edge surface and the associated contact surface of the electric hotplate, which allows ventilation of the interior of the switch housing. However, in addition to the housing body thus arranged and designed, the switch housing can also have a housing cover which closes the latter on the open side, in particular a flat or plate-shaped flat cover, which forms a component integrated with the switch housing. The temperature limiter can be designed essentially as described in DE-PS 2422625, to which reference is made for further details.

Die erfindungsgemäße Ausbildung eignet sich ganz be­sonders für solche Elektrokochplatten, bei denen am Kochplattenkörper, insbesondere im Bereich von dessen Unterseite, ein weiterer Temperaturfühler eines Lei­stungssteuergerätes vorgesehen ist und die daher wenigstens kurzzeitig für verhältnismäßig hohe ther­mische Belastungen geeignet sind. Es hat sich gezeigt, daß zwischen dem Temperaturfühler und dem Schalterge­häuse beim Betrieb der Elektrokochplatte Temperatur­unterschiede um etwa 140° C gegeben sind und daß da­her der Temperaturbegrenzer auf eine wesentlich höhere Abschalttemperatur justiert werden kann, ohne die Ge­fahr, daß Schalterteile bei diesen hohen Grenztempe­raturen beschädigt werden können. Weist der Kochplatten­körper nach Art einer Automatik-Kochplatte in einer in seinem Zentrum vorgesehenen Öffnung den zuletzt ge­nannten weiteren Temperaturfühler in Form einer un­mittelbar an der Unterseite des Kochgefäßes anliegenden Fühlkapsel auf, so sind sich durch die erfindungsgemäße Ausbildung dieser weitere Temperaturfühler und der Temperaturbegrenzer selbst bei Kochplatten relativ kleinen Durchmessers nicht im Wege, sondern auch räum­lich gut vollständig voneinander getrennt. Während der weitere Temperaturfühler die Temperatur unmittelbar am Kochgefäß abnimmt, nimmt der Temperaturfühler des Tempe­raturbegrenzers die Temperatur unmittelbar von der Un­terseite der beheizten Zone des Kochplattenkörpers ab.The design according to the invention is particularly suitable for those electric hotplates in which the hotplate body, in particular in the area thereof Underside, a further temperature sensor of a power control device is provided and are therefore suitable, at least for a short time, for relatively high thermal loads. It has been shown that there are temperature differences of around 140 ° C. between the temperature sensor and the switch housing during operation of the electric hotplate and that the temperature limiter can therefore be adjusted to a much higher switch-off temperature without the risk that switch parts will be damaged at these high limit temperatures can. If the hotplate body, in the manner of an automatic hotplate, has the last-mentioned further temperature sensor in the form of a sensor capsule lying directly on the underside of the cooking vessel, in an opening provided in its center, these additional temperature sensors and the temperature limiter are suitable even for hotplates due to the inventive design relatively small diameter not in the way, but also spatially well completely separated from each other. While the further temperature sensor decreases the temperature directly on the cooking vessel, the temperature sensor of the temperature limiter decreases the temperature directly from the underside of the heated zone of the hotplate body.

Diese und weitere Merkmale von bevörzugten Weiterbil­dungen der Erfindung gehen 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 und auf anderen Gebieten verwirklicht sein können. Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher erläutert. In den Zeichnungen zeigen

  • Fig. 1 einen Ausschnitt einer erfindungsgemäßen Elektrokochplatte in Seitenansicht,
  • Fig. 2 die Elektrokochplatte gemäß Fig. 1 in Ansicht von unten,
  • Fig. 3 einen Ausschnitt der Elektrokochplatte gemäß Fig. 1 in vergrößerter Darstellung und im Axialschnitt,
  • Fig. 4 einen Schnitt nach der Linie IV - IV in Fig. 3.
These and further features of preferred developments of the invention are also apparent from the description and the drawings, wherein the individual features can be implemented individually or in groups in the form of sub-combinations in one embodiment of the invention and in other fields. An embodiment of the invention is shown in the drawings and is explained in more detail below. Show in the drawings
  • 1 shows a detail of an electric hotplate according to the invention in side view,
  • 2 the electric hotplate according to FIG. 1 in a view from below,
  • 3 shows a detail of the electric hotplate according to FIG. 1 in an enlarged representation and in axial section,
  • 4 shows a section along the line IV-IV in FIG. 3.

Wie die Fig. 1 bis 4 zeigen, weist eine erfindungsgemäße Elektrokochplatte 1 einen kreis- bzw. ringförmigen, massiven Kochplattenkörper aus Gußwerkstoff 2 auf, dessen ringförmige ebene Oberseite eine Kochfläche 3 bildet und in dessen Unterseite 4 mindestens ein Heizwiderstand, insbesondere mindestens zwei Heizwiderstände 7,8 so ein­gesetzt sind, daß der Kochplattenkörper 2 einen im wesentlichen an seinen Außenumfang anschließenden, ring­förmigen, beheizten Bereich 5 und im Zentrum eine von diesem umgrenzte, nicht direkt beheizte Zone 6 bildet. Die in ineinanderliegenden Spiralen um die Zentral­achse 15 des Kochplattenkörpers 2 in einer gemeinsamen Ebene liegenden Heizwiderstände 7,8 sind in entsprechen­den Spiralnuten 9 in einem am nächsten bei der Koch­fläche 3 liegenden Bereich der Unterseite 4 des Koch­plattenkörpers 2 angeordnet, wobei benachbarte Spiral­nuten 9 durch verhältnismäßig dünne Spiralstege 10 von­einander getrennt sind. Die Heizwiderstände 7,8 sind in den Spiralnuten 9 gegenüber dem Kochplattenkörper 2 berührungsfrei in eine Isoliermasse 11 eingebettet, welche mit einer dünnen Schicht 12 auch die unteren Stirnkanten der Spiralstege 11 abdeckt und im Bereich zwischen jeweils zwei benachbarten Spiralstegen 10 im Querschnitt eine konkav einspringende und daher gegen­ über den Stirnkanten der Spiralstege 10 zurückver­setzte untere Fläche bildet. Der beheizte Bereich 5 ist am Innenumfang von einem weiter als die Spiral­stege 10 nach unten vorstehenden Ringflansch 13 des Kochplattenkörpers 2 und am Außenumfang von einem noch weiter nach unten vorstehenden äußeren Ring­flansch 14 begrenzt, welcher gegenüber dem an die Kochfläche 3 anschließenden Außenumfang des Koch­plattenkörpers 2 geringfügig nach innen versetzt ist und in einer dadurch gebildeten äußeren Ringschulter einen Tragring 16 zur Abstützung der Elektrokoch­platte im Bereich einer Öffnung einer Herdmulde trägt. Die Unterseite 4 des Kochplattenkörpers 2 ist nahezu vollständig, nämlich in einer vom äußeren Ringflansch 14 bis zum inneren Ringflansch 13 reichenden Ringzone, von einer deckelartigen Abdeckung 17 aus dünnem Blech abgedeckt, die an den unteren Stirnkanten der Ring­flansche 13,14 im wesentlichen ganzflächig anliegt und dadurch mit den Ringflanschen 13,14 und der Unter­seite des Kochplattenkörpers 2 einen entsprechenden Ringraum umschließt. Am Innenumfang des inneren Ring­flansches 13 weist die Abdeckung 17 einen zur Koch­fläche 3 hin gezogenen, eine zentrale Öffnung um­schließenden Kragen auf, der an zwei einander diame­tral gegenüberliegenden Stellen zu radial nach innen stehenden Befestigungslaschen 18 geformt ist, die mit in augenartige Ansätze des inneren Ringflansches 13 eingesetzten Schrauben zur Befestigung der Abdeckung 17 gegen den Kochplattenkörper 2 gesichert sind. Am Außen­umfang weist die Abdeckung 17, die auch nur am Innen­umfang des äußeren Ringflansches 14 abgestützt sein kann, einen in einer Ebene liegenden Flanschrand 19 auf, mit welchem sie an dem Ringflansch 14 anliegt.1 to 4 show, an electric hotplate 1 according to the invention has a circular or annular, solid hotplate body made of cast material 2, the annular flat top of which forms a cooking surface 3 and in the underside 4 at least one heating resistor, in particular at least two heating resistors 7 , 8 are inserted in such a way that the hotplate body 2 forms an annular, heated region 5 essentially adjoining its outer circumference and in the center a zone 6, which is delimited by the latter and is not directly heated. The heating resistors 7, 8 lying in one another in spirals about the central axis 15 of the hotplate body 2 in a common plane are arranged in corresponding spiral grooves 9 in an area of the underside 4 of the hotplate body 2 closest to the cooking surface 3, with adjacent spiral grooves 9 being relatively thin Spiral bars 10 are separated from each other. The heating resistors 7, 8 are embedded in the spiral grooves 9 with respect to the hotplate body 2 without contact in an insulating compound 11, which also covers the lower end edges of the spiral webs 11 with a thin layer 12 and has a concave and cross-sectionally penetrating section between two adjacent spiral webs 10 therefore against forms recessed lower surface over the end edges of the spiral webs 10. The heated area 5 is delimited on the inner circumference by an annular flange 13 of the hotplate body 2 projecting further downward than the spiral webs 10 and on the outer circumference by an outer ring flange 14 projecting even further downward, which is slightly different from the outer circumference of the hotplate body 2 adjoining the cooktop 3 is offset inwards and carries a support ring 16 for supporting the electric hotplate in the region of an opening of a hob in an outer annular shoulder formed thereby. The underside 4 of the hotplate body 2 is almost complete, namely in a ring zone extending from the outer ring flange 14 to the inner ring flange 13, covered by a cover-like cover 17 made of thin sheet metal, which bears essentially over the entire surface of the lower end edges of the ring flanges 13, 14 and thereby enclosing a corresponding annular space with the ring flanges 13, 14 and the underside of the hotplate body 2. On the inner circumference of the inner ring flange 13, the cover 17 has a collar which is drawn towards the cooking surface 3 and surrounds a central opening and is formed at two diametrically opposed locations to form radially inward fastening tabs 18, which also have eye-like projections of the inner ring flange 13 used screws for securing the cover 17 are secured against the hotplate body 2. On the outer circumference, the cover 17, which can also be supported only on the inner circumference of the outer ring flange 14, has a flange edge 19 lying in one plane, with which it lies against the ring flange 14.

In einer den Kochplattenkörper 2 innerhalb des inneren Ringflansches 13 im Zentrum durchsetzenden Öffnung 20 ist ein in Fig. 2 nicht dargestellter Temperatur­fühler 21 eines hydraulischen Ausdehnungssystemes so federnd angeordnet, daß er in entlastendem Zu­stand nach oben über die Kochfläche 3 vorsteht und durch das Aufsetzen eines Kochgefäßes entgegen Feder­kraft nach unten gedrückt wird. Dieser, in seiner oberen Endstellung anschlagbegrenzte Temperatur­fühler 21 ist über ein von seiner Unterseite wegge­führtes Kapillarrohr 22 mit dem beispielsweise durch eine Druckdose gebildeten Ausdehnungsglied 24 eines Leistungssteuergerätes 23 zur Bedienung der Elektro­kochplatte verbunden, wobei das Ausdehnungsglied 24 auf einen Schalter 25 des Leistungssteuergerätes 23 wirkt, welches mit einem auf einer Stellwelle ange­ordneten Betätigungsknopf 26 auf unterschiedliche Leistungsbereiche der Elektrokochplatte eingestellt werden kann.In an opening 20 penetrating the hotplate body 2 within the inner ring flange 13 in the center is a temperature sensor 21 (not shown in FIG. 2) of a hydraulic expansion system arranged so resiliently that it protrudes upwards over the cooking surface 3 in the relieving state and is pressed downward against the spring force by the placement of a cooking vessel. This temperature sensor 21, which is stop-limited in its upper end position, is connected via a capillary tube 22, which is guided away from its underside, to the expansion element 24 of a power control device 23, for example formed by a pressure cell, for operating the electric hotplate, the expansion element 24 acting on a switch 25 of the power control device 23, which can be set to different power ranges of the electric hotplate with an actuating button 26 arranged on an adjusting shaft.

Zusätzlich zum Temperaturfühler 21 und vollständig außerhalb des nicht direkt beheizten Bereiches 6,ist außerdem ein Temperaturbegrenzer 27 vorgesehen, bei welchem der Temperaturfühler 28 und das den Schalter­kopf bildende Schaltergehäuse 29 einschließlich des in diesem liegenden Begrenzerschalters 30 baulich miteinander integriert sind und eine geschlossene Bau­einheit bilden. Das in Draufsicht annähernd länglich rechteckige und in zwei Eckbereichen mit verhältnis­mäßig großen Krümmungsradien abgerundete Schalterge­häuse 29 weist an einer Längsseite benachbart zur zugehörigen Abrundung den etwa rechtwinklig über diese Längsseite vorstehenden, stabförmigen und geradlinigen Temperaturfühler 28 auf, dessen Länge größer als die des Schaltergehäuses ist. Der Temperaturfühler 28 besteht im wesentlichen aus einem metallischen Außen­rohr 31, das mit einer an seinem zugehörigen Ende vor­ gesehenen Flanschplatte 33 in einem entsprechenden Steckschlitz des Schältergehäuses 29 befestigt ist sowie einem in diesem Außenrohr 31 angeordneten, nichtmetallischen Innenstab 32 von sehr geringem Ausdehnungskoifizienten, der mit seinem äußeren Ende justierbar am freien Ende des Außenrohres 31 und mit seinem inneren, im Schaltergehäuse 29 liegenden Ende an einem Druckpunkt zur Betätigung des Begrenzer­schalters 30 abgestützt ist. Die Mittelachse 35 des Temperaturfühlers 28 liegt rechtwinklig zu einer Axialebene 34 der Zentralachse 15, die etwa durch die Mitte zwischen den Längsbegrenzungen des Schalter­gehäuses 29 geht, wobei das freie Ende des Temperatur­fühlers 28 nahezu bis zum Innenumfang des äußeren Ringflansches 14 reicht, jedoch gegenüber diesem be­rührungsfrei ist. Die Mittelachse 35 liegt ferner parallel zur Kochfläche 3 bzw. zur Unterseite 4 des Kochplattenkörpers 2, wobei jedoch der Temperatur­fühler 28 im wesentlichen über seine gesamte Länge gegenüber dieser Unterseite 2 und der Abdeckung 17 berührungsfrei ist und verhältnismäßig nahe bei einem zu ihm im Querschnitt parallelen Wandungsab­schnitt der Abdeckung 17 liegt.In addition to the temperature sensor 21 and completely outside the not directly heated area 6, a temperature limiter 27 is also provided, in which the temperature sensor 28 and the switch housing 29 forming the switch head, including the limiter switch 30 located therein, are structurally integrated with one another and form a closed structural unit. The switch housing 29, which is approximately oblong in plan view and rounded in two corner areas with relatively large radii of curvature, has on one long side adjacent to the associated rounding the rod-shaped and rectilinear temperature sensor 28 protruding approximately at right angles over this long side, the length of which is greater than that of the switch housing. The temperature sensor 28 consists essentially of a metallic outer tube 31, which has one at its associated end seen flange plate 33 is fastened in a corresponding slot of the switch housing 29 and in this outer tube 31 arranged, non-metallic inner rod 32 of very low expansion coefficient, which is adjustable with its outer end at the free end of the outer tube 31 and with its inner end lying in the switch housing 29 is supported at a pressure point for actuating the limiter switch 30. The central axis 35 of the temperature sensor 28 lies at right angles to an axial plane 34 of the central axis 15, which extends approximately through the middle between the longitudinal boundaries of the switch housing 29, the free end of the temperature sensor 28 reaching almost to the inner circumference of the outer ring flange 14, but without contact with it is. The central axis 35 is also parallel to the cooking surface 3 or to the underside 4 of the hotplate body 2, but the temperature sensor 28 is essentially contact-free over its entire length with respect to this underside 2 and the cover 17 and is relatively close to a wall section parallel to it the cover 17 is.

Der Temperaturfühler 28 befindet sich im wesentlichen über seine gesamte Länge innerhalb des von der Ab­deckung 17 abgedeckten Raumes, während das Schal­tergehäuse 29 vollständig außerhalb dieses Raumes an der Unterseite der Abdeckung 17, nämlich in einer in diese eingeformten Vertiefung 36 liegt. Diese Ver­tiefung 36 weist als Bodenwand einen ebenen Wandab­schnitt 37 auf, an welchem das Schaltergehäuse 29 mit seiner Oberseite im wesentlichen ganzflächig anliegt. An den Wandabschnitt 37 schließen vier quer zu diesem nach unten abstehende, an den Längsseiten eines gedach­ ten Rechteckes bzw. Quadrates liegende Randwandungen 38 bis 41 an, die im Querschnitt gemäß den Fig. 3 und 4 unter spitzen Winkeln nach unten und außen geneigt sind und unterschiedliche Höhen haben. Die beiden etwa rechtwinklig zum Temperaturfühler 28 stehenden, gleich­hohen Randwandungen 38,39 haben die größte Höhe, während die rechtwinklig dazu und näher bei der Zentralachse 15 liegende Randwandung 41 die kleinste Höhe hat, nämlich nur vom Niveau der Unterseite 4 des beheizten Bereiches 5 bis zum Niveau der Stirnkante des inneren Ringflan­sches 13 reicht; die gegenüberliegende Randwandung 40 hat eine dazwischenliegende Höhe und geht über einen Schulterabsatz in den Flanschrand 19 über. Die in Längsrichtung des Schaltergehäuses 29 gemessene Brei­te des Wandabschnittes 37 ist nur sehr wenig größer als die Länge des Schaltergehäuses 29, während die in Längsrichtung des Temperaturfühler 28 gemessene Er­streckung des Wandabschnittes 37 gegenüber der zuge­hörigen Breite des Schaltergehäuses 29 größer ist, das Schaltergehäuse 29 jedoch unmittelbar benachbart zu der dem Temperaturfühler 28 zugehörigen Randwandung 38 liegt. In dieser Randwandung 38 ist eine verhältnis­mäßig enge, an den Außenquerschnitt des Temperatur­fühlers 28 angepaßte Durchtrittsöffnung 42 vorgesehen, durch welche der Temperaturfühler 28 unmittelbar be­nachbart zum Schaltergehäuse 29 hindurch gesteckt ist und an deren Begrenzung der Temperaturfühler 28 punkt­förmig anliegend abgestützt ist. In der gegenüber­liegenden Randwandung 39 ist eine größere Durchgangs­öffnung 43 vorgesehen, in welche ein Isolierstück 44 annähernd spielfrei mit einem Schaftabschnitt einge­setzt ist, der an der Innenseite der Vertiefung 36 einen gegenüber der Durchgangsöffnung 43 erweiterten Kopf aufweist, welcher unmittelbar benachbart zur Rand­wandung 39 liegen kann. Durch das im Querschnitt vor­zugsweise flachovale Isolierstück 44, dessen größere Querschnittserstreckung parallel zum Wandabschnitt 37 liegt, sind zwei Anschlußleitungen 45 derart hindurch­geführt, daß deren zwischen dem Isolierstück 44 und dem Schaltergehäuse 29 freiliegende, zweifach abge­winkelte Abschnitt 46 verhältnismäßig kurz sind, näm­lich in Längsrichtung des Temperaturfühlers 28 eine Ausdehnung haben, die nur geringfügig größer als die Länge von Anschlußfahnen 47 ist, welche über die vom Temperaturfühler 28 abgekehrte Seite des Schalterge­häuses 29 beiderseits benachbart zu dessen Schmal­seiten und parallel zueinander vorstehen. Das Isolier­stück 44 ist in seiner Lage gegenüber den Anschlußlei­tungen 45 durch unmittelbar benachbart zu seinen bei­den Enden liegende Abwinkelungen dieser Anschlußlei­tungen 45 gesichert, wobei die Abschnitte 46 benach­bart zum Isolierstück 44 voneinander weg und dann ein weiteres Mal in Richtung zum Schaltergehäuse 29 abgewinkelt sind. Die innerhalb der Abdeckung 17 liegenden Abschnitte der Anschlußleitungen 45 sind an Anschlußstifte an den Enden der Heizwiderstände 7,8 angeschlossen, die über die Isoliermasse 11 nach unten vorstehen und nahe benachbart zur Vertiefung 36 liegen.The temperature sensor 28 is located essentially over its entire length within the space covered by the cover 17, while the switch housing 29 lies completely outside of this space on the underside of the cover 17, namely in a recess 36 molded into it. This recess 36 has a flat wall section 37 as the bottom wall, on which the switch housing 29 rests with its upper side essentially over the entire surface. On the wall section 37 close four transversely to this down, on the long sides of a roof th rectangle or square lying edge walls 38 to 41, which are inclined at acute angles downwards and outwards in cross section according to FIGS. 3 and 4 and have different heights. The two edge walls 38, 39 which are approximately at right angles to the temperature sensor 28 have the greatest height, while the edge wall 41 lying at right angles thereto and closer to the central axis 15 has the smallest height, namely only from the level of the underside 4 of the heated area 5 to Level of the front edge of the inner ring flange 13 is sufficient; the opposite edge wall 40 has an intermediate height and merges with the shoulder 19 into the flange 19. The width of the wall section 37 measured in the longitudinal direction of the switch housing 29 is only very slightly larger than the length of the switch housing 29, while the extension of the wall section 37 measured in the longitudinal direction of the temperature sensor 28 is larger compared to the associated width of the switch housing 29, but the switch housing 29 is immediate is adjacent to the edge wall 38 associated with the temperature sensor 28. Provided in this edge wall 38 is a relatively narrow passage opening 42, which is adapted to the outer cross section of the temperature sensor 28, through which the temperature sensor 28 is inserted immediately adjacent to the switch housing 29 and on the limitation of which the temperature sensor 28 is supported in a point-like manner. In the opposite edge wall 39, a larger through opening 43 is provided, into which an insulating piece 44 is inserted with almost no play, with a shaft section which on the inside of the recess 36 has a head which is widened relative to the through opening 43 and which can be located directly adjacent to the edge wall 39. Due to the preferably flat oval cross section 44, the larger Cross-sectional extent parallel to the wall section 37, two connecting lines 45 are passed such that their exposed, double-angled section 46 between the insulating piece 44 and the switch housing 29 are relatively short, namely in the longitudinal direction of the temperature sensor 28 have an expansion that is only slightly larger than that Length of connecting lugs 47, which project beyond the side of the switch housing 29 remote from the temperature sensor 28, on both sides adjacent to its narrow sides and parallel to one another. The insulating piece 44 is secured in its position in relation to the connecting lines 45 by bends of these connecting lines 45 lying directly adjacent to its two ends, the sections 46 adjacent to the insulating piece 44 being separated from one another and then angled once more in the direction of the switch housing 29. The sections of the connecting lines 45 lying within the cover 17 are connected to connecting pins at the ends of the heating resistors 7, 8, which protrude downward beyond the insulating compound 11 and are located close to the recess 36.

Das Schaltergehäuse 29 des Temperaturbegrenzers 27 weist einen den Begrenzerschalter 30 sowie die Flansch­platte 33 vollständig versenkt aufnehmenden Grund­körper 48 auf, der an seiner oberen Seite zum Ein­stecken sämtlicher Schalterteile sowie der Flansch­platte 33 offen ist und mit einem seinem Grundriß gleichenden Gehäusedeckel 49 verschlossen sein kann. Das Schaltergehäuse 29 reicht höchstens bis an die durch den Flanschrand 19 gebildete Unterseite der Ab­deckung 17 oder steht über diese nach unten nur äußerst geringfügig vor.The switch housing 29 of the temperature limiter 27 has a base body 48 which receives the limiter switch 30 and the flange plate 33 in a completely recessed manner, which is open on its upper side for inserting all the switch parts and the flange plate 33 and can be closed with a housing cover 49 which has the same layout. The switch housing 29 extends at most up to the underside of the cover 17 formed by the flange edge 19 or projects only extremely slightly downwards over it.

Der ebene Wandabschnitt 37 liegt nur linienförmig im Bereich der Stirnkanten der Spiralstege 10 bzw. der Schicht 12 an und ist im Bereich der Spiralnuten 9 unter Bildung seitlich offener Kanäle gegenüber der Isoliermasse 11 berührungsfrei.The flat wall section 37 lies only linearly in the region of the end edges of the spiral webs 10 or the layer 12 and is contact-free in the region of the spiral grooves 9 with the formation of laterally open channels with respect to the insulating compound 11.

Die erfindungsgemäße oder eine ähnliche Ausbildung eignet sich auch in vorteilhafter Weise dafür, den Temperaturfüh­ler 28 durch zusätzliche Maßnahmen besonders eng bzw. intensiv wärmeleitend an den zu messenden Bereich anzukop­peln. Beispielsweise kann der Temperaturfühler 28 unter der Abdeckung 17 mit einem wesentlich über seine Außenform vorstehenden Leitblech aus rostfreiem Stahl oder dgl. versehen sein, das den Temperaturfühler 28 zweckmäßig eng umschließend annähernd auf dessen ganzer Länge umgibt und etwa parallel zur Unterseite des Kochplattenkörpers 2 über beide Seiten des Temperaturfühlers 28 vorsteht. Dieses Leitblech 50 kann in einfacher Weise dadurch in Längsrich­tung auf den Temperaturfühler 28 aufschiebbar sein, daß es mit hintereinander quer zum Temperaturfühler 28 liegenden Schlitzen versehen ist und zwischen benachbarten Schlitzen liegende Abschnitte abwechselnd nach beiden Seiten rinnen­förmig aus der Ebene des Leitbleches 50 herausgebogen sind, so daß eine in Längsansicht des Temperaturfühlers 28 über den Umfang geschlossene Stecköffnung für den Tempera­turfühler 28 gebildet ist. Die beiderseits über den Tempe­raturfühler 28 vorstehenden Flügel des Leitbleches 50 können in einer gemeinsamen Ebene liegen oder aus dieser Ebene derart herausgebogen sein, daß sie entweder näher an der Unterseite 4 des Kochplattenkörpers 2 liegen oder sogar großflächig an dieser anliegen oder daß sie weiter entfernt von dieser Unterseite 4 nahe benachbart zur Abdeckung 7 vorgesehen sind, je nach dem,wie die Wärme­leit-Ankoppelung justiert werden soll. Der Außenrand des Leitbleches 50 kann auch so gestaltet sein, daß er einer Gegenfläche der übrigen Kochplatte, beispielsweise der Innenfläche des äußeren Ringflansches 14 unmittelbar benachbart gegenüberliegt, so daß der Temperaturfühler 28 durch Anschlag an dieser Gegenfläche gegen seitliche Auslenkungen gesichert ist.The configuration according to the invention or a similar configuration is also advantageously suitable for coupling the temperature sensor 28 to the area to be measured in a particularly closely or intensely heat-conducting manner by means of additional measures. For example, the temperature sensor 28 can be provided under the cover 17 with a baffle plate made of stainless steel or the like, which protrudes substantially beyond its outer shape and expediently closely surrounds the temperature sensor 28 approximately over its entire length and approximately parallel to the underside of the hotplate body 2 on both sides of the temperature sensor 28 protrudes. This baffle 50 can be pushed in the longitudinal direction onto the temperature sensor 28 in a simple manner in that it is provided with slits lying one behind the other transversely to the temperature sensor 28 and sections lying between adjacent slits are alternately bent out of the plane of the baffle 50 in a channel-like manner on both sides, so that a plug opening for the temperature sensor 28 is formed in the longitudinal view of the temperature sensor 28 over the circumference. The wings of the guide plate 50 projecting on both sides above the temperature sensor 28 can lie in a common plane or can be bent out of this plane in such a way that they are either closer to the underside 4 of the hotplate body 2 or even lie against it over a large area or that they are further away from it Bottom 4 are provided close to the cover 7, depending on how the thermal coupling should be adjusted. The outer edge of the guide plate 50 can also be designed so that it is one Opposing surface of the rest of the hotplate, for example, lies directly adjacent to the inner surface of the outer ring flange 14, so that the temperature sensor 28 is secured against lateral deflections by a stop on this counter surface.

Zusätzlich zu mindestens einem der beiden, die Leistung der Elektrokochplatte schaltenden Leistungskontakte kann auch noch ein Hilfskontakt für eine Heißanzeige bzw. als Heißanzeige vorgesehen sein, so daß die einzelnen Kontakte infolge geringerer Leistungsbelastungen schwächer dimen­sioniert werden können. Dieser zusätzliche Hilfskontakt schließt bei steigender Temperatur. Die erfindungsgemäße Ausbildung ist außer für sog. Automatik-Kochplatten auch für solche Elektrokochplatten geeignet, welche im Zentrum keinen Automatik-Temperaturfühler 21 aufweisen, bei wel­chen jedoch die durchbruchsfreie Mittelzone 6 durch andere Bauteile, wie Temperaturschalter, Befestigungsglieder oder ähnliches, belegt ist.In addition to at least one of the two power contacts that switch the power of the electric hotplate, an auxiliary contact for a hot display or as a hot display can also be provided, so that the individual contacts can be dimensioned weaker due to lower power loads. This additional auxiliary contact closes when the temperature rises. In addition to so-called automatic hotplates, the design according to the invention is also suitable for those electric hotplates which do not have an automatic temperature sensor 21 in the center, but in which the breakthrough-free central zone 6 is occupied by other components, such as temperature switches, fastening elements or the like.

Claims (11)

1. Elektrokochplatte (l) mit einem Kochplattenkörper (2), der an seiner von einer Kochfläche (3) abgekehrten Unterseite (4) um eine Mittelzone (6) mit mindestens einem Heizwider­stand (7, 8) versehen ist und wenigstens einen Temperatur­begrenzer (27) aufweist, der mit einem einen Begrenzerschal­ter (30) aufnehmenden Schaltergehäuse (29) im beheizten Bereich (5) an der Unterseite des Kochplattenkörpers (2) liegt und mit einem Temperaturfühler (28) versehen ist, dadurch gekennzeichnet, daß der Temperaturfühler (28) des Temperaturbegrenzers (27) als außerhalb des Schaltergehäu­ses (29) freiliegender Dehnstabfühler ausgebildet ist, der vollständig außerhalb der Mittelzone (6) und mit Abstand von der Unterseite (4) des Kochplattenkörpers (2) etwa para­lel zu dieser liegt.1. electric hotplate (l) with a hotplate body (2) which is provided on its underside (4) facing away from a cooking surface (3) around a central zone (6) with at least one heating resistor (7, 8) and at least one temperature limiter (27 ) which has a switch housing (29) receiving a limiter switch (30) in the heated area (5) on the underside of the hotplate body (2) and is provided with a temperature sensor (28), characterized in that the temperature sensor (28) the temperature limiter (27) is designed as an exposed rod sensor outside the switch housing (29), which is completely outside the central zone (6) and at a distance from the underside (4) of the hotplate body (2) approximately parallel to it. 2. Elektrokochplatte, insbesondere nach Anspruch l, dadurch gekennzeichnet, daß die Unterseite (4) des Kochplattenkör­pers (2) mindestens teilweise mit einer Abdeckung (l7) ver­sehen ist, und daß das Schaltergehäuse (29) wenigstens teil­weise außerhalb und der Temperaturfühler (28) im wesentli­ chen innerhalb der Abdeckung (l7) liegt, wobei vorzugswei­se das Schaltergehäuse (29) vollständig außerhalb der Ab­deckung (l7) liegt und insbesondere zwischen dem Schalter­gehäuse (29) und der Unterseite (4) des Kochplattenkörpers (2) ein im wesentlichen vollständig geschlossener Wandab­schnitt (37) vorgesehen ist.2. Electric hotplate, in particular according to claim l, characterized in that the underside (4) of the hotplate body (2) is at least partially provided with a cover (l7), and that the switch housing (29) at least partially outside and the temperature sensor (28) essentially Chen lies within the cover (l7), the switch housing (29) preferably lying completely outside the cover (l7) and in particular between the switch housing (29) and the underside (4) of the hotplate body (2) an essentially completely closed wall section ( 37) is provided. 3. Elektrokochplatte, insbesondere nach einem der vorhergehen­den Ansprüche, dadurch gekennzeichnet, daß das Schalterge­häuse (29) wenigstens annähernd gegen die Unterseite (4) des Kochplattenkörpers (2), insbesondere gegen eine den Heizwiderstand (7, 8) einbettende Isoliermasse (ll) abge­stützt ist, und daß vorzugsweise die Abdeckung (l7) an ihrer Unterseite eine das Schaltergehäuse (29) aufnehmende Ver­tiefung (36) aufweist, deren ebene Bodenwand annähernd an der Unterseite (4) des Kochplattenkörpers (2) anliegt.3. Electric hotplate, in particular according to one of the preceding claims, characterized in that the switch housing (29) is supported at least approximately against the underside (4) of the hotplate body (2), in particular against an insulating compound (11) embedding the heating resistor (7, 8) and that the cover (l7) preferably has on its underside a recess (36) accommodating the switch housing (29), the flat bottom wall of which rests approximately on the underside (4) of the hotplate body (2). 4. Elektrokochplatte, insbesondere nach einem der vorhergehen­den Ansprüche, dadurch gekennzeichnet, daß der Temperatur­fühler (28), insbesondere unmittelbar benachbart zum Schal­tergehäuse (29) durch eine Durchtrittsöffnung (42) einer Abdeckung (l7) an deren Innenseite geführt ist bzw. daß Anschlußleitungen (45) des Temperaturbegrenzers (27) vom Schaltergehäuse (29) durch eine Durchgangsöffnung (43) in der Abdeckung (l7) an deren Innenseite zum Heizwiderstand (7, 8) geführt sind und vorzugsweise im Bereich der Durchgangs­öffnung (43) in einem in diese eingesetzten Isolierkörper (44) aus Keramik o.dgl. liegen.4. Electric hotplate, in particular according to one of the preceding claims, characterized in that the temperature sensor (28), in particular directly adjacent to the switch housing (29) through a passage opening (42) of a cover (l7) is guided on the inside thereof or that connecting lines ( 45) of the temperature limiter (27) from the switch housing (29) through a through opening (43) in the cover (l7) on the inside thereof to the heating resistor (7, 8) and preferably in the area of the through opening (43) inserted into one Insulating body (44) made of ceramic or the like. lie. 5. Elektrokochplatte, insbesondere nach einem der vorhergehen­den Ansprüche, dadurch gekennzeichnet, daß der Temperatur­begrenzer (27) durch mindestens eine Steckhalterung an der Kochplatte, insbesondere ausschließlich an der Abdeckung (l7) gehaltert ist, wobei vorzugsweise der in die Durchtritts­öffnung (42) eingreifende Temperaturfühler (28) und/oder der auf der davon abgekehrten Seite des Schaltergehäuses (29) in die Durchgangsöffnung (43) eingreifende Isolierkörper (44) je­weils eine Steckhalterung bildet.5. Electric hotplate, in particular according to one of the preceding claims, characterized in that the temperature limiter (27) by at least one plug holder on the hotplate, in particular exclusively on the cover (l7) is held, the temperature sensor (28) engaging in the passage opening (42) and / or the insulating body (44) engaging in the passage opening (43) on the side of the switch housing (29) remote therefrom each forming a plug-in holder. 6. Elektrokochplatte, insbesondere nach einem der vorhergehen­den Ansprüche, dadurch gekennzeichnet, daß eine Durchtritts­öffnung (42) für den Temperaturfühler (28) und/oder eine Durchgangsöffnung (43) für Anschlußleitungen (45) in einem zur Unterseite (4) des Kochplattenkörpers (2) quer liegen­den Wandungsabschnitt einer Abdeckung (l7), insbesondere in zwei einander etwa parallel gegenüberliegenden und im Querschnitt geneigten Randwandungen (38, 39) der Vertiefung (36) vorgesehen sind.6. Electric hotplate, in particular according to one of the preceding claims, characterized in that a passage opening (42) for the temperature sensor (28) and / or a passage opening (43) for connecting lines (45) in one to the underside (4) of the hotplate body (2nd ) transverse wall section of a cover (l7), in particular in two edge walls (38, 39) of the recess (36) which are approximately parallel to one another and are inclined in cross section are provided. 7. Elektrokochplatte, insbesondere nach einem der vorhergehen­den Ansprüche, dadurch gekennzeichnet, daß an Anschlußfah­nen (47) des Schaltergehäuses (29) anschließende Abschnitt (46) von Anschlußleitungen (45), insbesondere zwischen den Anschlußfahnen (47) und dem Isolierkörper (44) liegende Abschnitte (46) als vorzugsweise winkelförmige federnde Tragarme für den Temperaturbegrenzer (27) vorgesehen sind, die aus formstabilem Vollquerschnittdraht bestehen.7. Electric hotplate, in particular according to one of the preceding claims, characterized in that on connecting lugs (47) of the switch housing (29) adjoining section (46) of connecting lines (45), in particular between the connecting lugs (47) and the insulating body (44) Sections (46) are provided as preferably angular, resilient support arms for the temperature limiter (27), which consist of dimensionally stable, full cross-sectional wire. 8. Elektrokochplatte, insbesondere nach einem der vorhergehen­den Ansprüche, dadurch gekennzeichnet, daß die Mittelachse (35) des Temperaturfühlers (28) etwa tangential zu einem um die Zentralachse (l5) des Kochplattenkörpers (2) geleg­ten Kreis liegt, der vorzugsweise etwa in der Mitte der Breite des die Heizwiderstände (7, 8) aufweisenden Berei­ches (5) vorgesehen ist, wobei insbesondere das Schalterge­häuse (29) im Bereich der zur Mittelachse (35) des Tempe­raturfühlers (28) rechtwinkligen Axialebene (34) des Koch­plattenkörpers (2) liegt.8. Electric hotplate, in particular according to one of the preceding claims, characterized in that the central axis (35) of the temperature sensor (28) is approximately tangential to a circle about the central axis (l5) of the hotplate body (2), which is preferably approximately in the middle the width of the area (5) having the heating resistors (7, 8) is provided, the switch housing (29) in particular being in the area of the axial plane (34) of the hotplate body (2) perpendicular to the central axis (35) of the temperature sensor (28). 9. Elektrokochplatte, insbesondere nach einem der vorhergehen­den Ansprüche, dadurch gekennzeichnet, daß das Schalterge­häuse (29) zwischen einem äußeren und einem inneren, an der Unterseite des Kochplattenkörpers (2) vorstehenden Ring­flansch (l4, l3) angeordnet ist, und daß vorzugsweise die Abdeckung (l7) benachbart zur Vertiefung (36) an mindestens einem dieser Ringflansche (l3, l4), insbesondere stirnsei­tig, abgestützt ist.9. Electric hotplate, in particular according to one of the preceding claims, characterized in that the switch housing (29) between an outer and an inner, on the underside of the hotplate body (2) projecting ring flange (l4, l3) is arranged, and that preferably the cover (l7) adjacent to the recess (36) is supported on at least one of these ring flanges (l3, l4), in particular on the end face. l0. Elektrokochplatte, insbesondere nach einem der vorhergehen­den Ansprüche, dadurch gekennzeichnet, daß das Schalterge­häuse (29) einen napfförmigen, an einer Seite für die einge­steckte Montage der Schalterteile und des Temperaturfühlers (28) offenen und insbesondere an dieser Seite mit einem Gehäusedeckel (49) verschlossenen Gehäusekörper (48) auf­weist, und daß vorzugsweise der Gehäusekörper (48) mit sei­ner offenen Seite der Unterseite (4) des Kochplattenkörpers (2) zugekehrt ist.l0. Electric hotplate, in particular according to one of the preceding claims, characterized in that the switch housing (29) has a cup-shaped housing body which is open on one side for the inserted assembly of the switch parts and the temperature sensor (28) and in particular is closed on this side with a housing cover (49) (48), and that the housing body (48) preferably faces the underside (4) of the hotplate body (2) with its open side. 11. Elektrokochplatte, insbesondere nach einem der vorhergehen­den Ansprüche, dadurch gekennzeichnet, daß an dem Kochplat­tenkörper (2), insbesondere im Bereich von dessen Untersei­te, ein weiterer Temperaturfühler eines Leistungssteuerge­rätes (23) vorgesehen ist, wobei vorzugsweise der Kochplat­tenkörper (2) in einer in seinem Zentrum vorgesehenen Öff­nung (20) diesen in den Bereich der Kochfläche (3) reichen­den Temperaturfühler (2l) aufweist, der insbesondere als hydraulischer Temperaturfühler (2l) über ein Kapillarrohr (22) mit einem auf einen Schalter (25) wirkenden Ausdehnungs­glied (24) verbunden ist.11. Electric hotplate, in particular according to one of the preceding claims, characterized in that a further temperature sensor of a power control device (23) is provided on the hotplate body (2), in particular in the region of its underside, preferably the hotplate body (2) in one The opening (20) provided in the center thereof has a temperature sensor (2l) reaching into the area of the cooking surface (3), which in particular as a hydraulic temperature sensor (2l) via a capillary tube (22) with an expansion element (24) acting on a switch (25). connected is.
EP87106190A 1986-05-27 1987-04-29 Electric cooking plate Expired - Lifetime EP0249721B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87106190T ATE80934T1 (en) 1986-05-27 1987-04-29 ELECTRIC HOTPLATE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3617742 1986-05-27
DE19863617742 DE3617742A1 (en) 1986-05-27 1986-05-27 ELECTRIC COOKING PLATE

Publications (2)

Publication Number Publication Date
EP0249721A1 true EP0249721A1 (en) 1987-12-23
EP0249721B1 EP0249721B1 (en) 1992-09-23

Family

ID=6301704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106190A Expired - Lifetime EP0249721B1 (en) 1986-05-27 1987-04-29 Electric cooking plate

Country Status (7)

Country Link
US (1) US4723067A (en)
EP (1) EP0249721B1 (en)
JP (1) JPS6366883A (en)
AT (1) ATE80934T1 (en)
AU (1) AU593481B2 (en)
DE (2) DE3617742A1 (en)
YU (1) YU96087A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1865752A1 (en) * 2006-06-09 2007-12-12 Eika, S.Coop Radiant heater mounted with a thermal switch in a cooking hob
US7488920B2 (en) 2004-06-14 2009-02-10 Eika, S. Coop Radiant heater in a cooking hob with a thermal switch

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128467A1 (en) * 1991-05-22 1992-11-26 Braun Ag TEMPERATURE SENSOR FOR A BREW BEVERAGE PREPARATION MACHINE
JP2636557B2 (en) * 1991-05-31 1997-07-30 日本鋼管株式会社 Method for detecting in-furnace tension of annealed material in horizontal continuous annealing furnace
DE4212289A1 (en) * 1992-04-11 1993-10-14 Ego Elektro Blanc & Fischer Electric heating unit esp. cooking plate - has at least one heating resistance with associated insulation and at least one electric connecting pin projecting from insulation and at least one insulated block
GB2335541A (en) * 1998-03-20 1999-09-22 Ceramaspeed Ltd Electric heater comprising a temperature sensing and limiting arrangement
WO2003034011A2 (en) * 2001-10-15 2003-04-24 Bezalel Urban Fire hazard prevention system
CN108770089A (en) * 2018-07-09 2018-11-06 江苏众众电热科技有限公司 A kind of new-energy automobile instrument desk heater
JP6935159B1 (en) 2020-04-30 2021-09-15 中外炉工業株式会社 Simulation method of processing state of strip

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749883A (en) * 1972-07-17 1973-07-31 Emerson Electric Co Electric heater assembly
DE2422625B2 (en) * 1974-05-10 1977-02-24 Fischer, Karl, 7519 Oberderdingen TEMPERATURE LIMITER
DE2551137A1 (en) * 1975-11-14 1977-05-18 Ego Elektro Blanc & Fischer ELECTRIC RADIATION HEATING FOR A CERAMIC GLASS PANEL
DE2620004A1 (en) * 1976-05-06 1978-01-19 Karl Fischer ELECTRIC COOKING PLATE WITH A TEMPERATURE LIMITER

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2148407A (en) * 1937-07-06 1939-02-21 Standard Electric Mfg Corp Surface burner control
US2311087A (en) * 1939-05-13 1943-02-16 Sandell Bror Hugo Ragnvald Electrically heated stove and the like
DE1120099B (en) * 1955-04-21 1961-12-21 Licentia Gmbh Electrically heated mass cooking plate
DE1127007B (en) * 1958-03-28 1962-04-05 Karl Fischer Electrically heated mass quick cooking plate
IL29462A (en) * 1967-02-16 1971-11-29 Fischer K Electric hot-plates
DE2459649B2 (en) * 1974-12-17 1979-10-18 Karl 7519 Oberderdingen Fischer Electric hotplate with a heating system consisting of three heating elements
DE2627373B2 (en) * 1976-06-18 1978-10-12 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen Signal device on cooking appliances with a glass ceramic hob
DE3027998A1 (en) * 1980-07-24 1982-02-25 Fischer, Karl, 7519 Oberderdingen ELECTRIC HOTPLATE WITH OVERHEATING PROTECTOR
DE8133341U1 (en) * 1980-11-17 1982-03-25 Micropore International Ltd., Droitwich, Worcestershire ELECTRIC RADIATION HEATER FOR COOKERS WITH GLASS CERAMIC COVER PANELS
DE3131462A1 (en) * 1981-08-08 1983-02-24 Karl 7519 Oberderdingen Fischer Temperature-limited hotplate
EP0079483B1 (en) * 1981-11-10 1986-02-26 E.G.O. Elektro-Geräte Blanc u. Fischer Control device for an electrical cooking plate
DE8301364U1 (en) * 1982-07-07 1987-06-25 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De
DE3315333A1 (en) * 1983-04-28 1984-10-31 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen COOKER WITH MULTIPLE ELECTRIC COOKING PLATES

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749883A (en) * 1972-07-17 1973-07-31 Emerson Electric Co Electric heater assembly
DE2422625B2 (en) * 1974-05-10 1977-02-24 Fischer, Karl, 7519 Oberderdingen TEMPERATURE LIMITER
DE2551137A1 (en) * 1975-11-14 1977-05-18 Ego Elektro Blanc & Fischer ELECTRIC RADIATION HEATING FOR A CERAMIC GLASS PANEL
DE2620004A1 (en) * 1976-05-06 1978-01-19 Karl Fischer ELECTRIC COOKING PLATE WITH A TEMPERATURE LIMITER

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7488920B2 (en) 2004-06-14 2009-02-10 Eika, S. Coop Radiant heater in a cooking hob with a thermal switch
EP1865752A1 (en) * 2006-06-09 2007-12-12 Eika, S.Coop Radiant heater mounted with a thermal switch in a cooking hob

Also Published As

Publication number Publication date
EP0249721B1 (en) 1992-09-23
YU96087A (en) 1989-10-31
JPS6366883A (en) 1988-03-25
US4723067A (en) 1988-02-02
ATE80934T1 (en) 1992-10-15
AU7334387A (en) 1987-12-03
AU593481B2 (en) 1990-02-08
DE3617742A1 (en) 1987-12-03
DE3781833D1 (en) 1992-10-29

Similar Documents

Publication Publication Date Title
EP0141923B1 (en) Temperature limiter for a glass-ceramic cooking unit
EP0585831B9 (en) Heater, especially for kitchen appliances
EP0544244B1 (en) Temperature - detector
EP0542142B1 (en) Radiant heating unit
DE3705260A1 (en) TEMPERATURE LIMITERS
DE102005045432A1 (en) Valve adjusting arrangement for use in heating and ventilation engineering, has pressure spring acting on metallic part and mounted in housing such that metallic part is held in end position during cessation of heating
WO2001062048A1 (en) Cooking surface comprising a temperature sensor
EP0249721B1 (en) Electric cooking plate
EP0100861B1 (en) Electric cooking plate with a temperature-protected switchgear
DE19824871A1 (en) Temperature switch, in particular adjustable temperature controller
EP0203449B1 (en) Heating unit for an electric cooking stove
EP0377169B1 (en) Switch apparatus
DE2422624A1 (en) TEMPERATURE LIMITER
DE3333645A1 (en) Temperature limiter for a glass-ceramic cooking unit
EP0307630A1 (en) Cooking plate
DE3315657A1 (en) Electric cooking appliance
DE3317100C2 (en) Monitoring device for hot plates, especially glass ceramic hot plates
EP0338285A1 (en) Electric-cooker plate
DE3519035A1 (en) Electrical hotplate
EP0258590B1 (en) Feed-through piece for connecting cables of an electric cooking plate
EP0235680B1 (en) Electrical cooking plate
DE4138814C2 (en) Temperature Control Unit
EP0442284B1 (en) Electric cooking plate
DE602004005160T2 (en) ELECTRIC RADIANT HEATER
EP0865058B1 (en) Electrical power regulator, in particular for electric heaters

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE ES FR GB GR IT LI SE

17P Request for examination filed

Effective date: 19871218

17Q First examination report despatched

Effective date: 19881003

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE ES FR GB GR IT LI SE

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

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19920923

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19920923

Ref country code: SE

Effective date: 19920923

REF Corresponds to:

Ref document number: 80934

Country of ref document: AT

Date of ref document: 19921015

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3781833

Country of ref document: DE

Date of ref document: 19921029

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19921216

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF THE APPLICANT RENOUNCES

Effective date: 19930305

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

Ref country code: GB

Effective date: 19930429

Ref country code: AT

Effective date: 19930429

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

Ref country code: CH

Effective date: 19930430

Ref country code: LI

Effective date: 19930430

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

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

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19931229

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Ref country code: DE

Effective date: 19940101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930429

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST