EP0031514A1 - Electric heating radiator, and process and apparatus for its manufacture - Google Patents

Electric heating radiator, and process and apparatus for its manufacture Download PDF

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Publication number
EP0031514A1
EP0031514A1 EP80107754A EP80107754A EP0031514A1 EP 0031514 A1 EP0031514 A1 EP 0031514A1 EP 80107754 A EP80107754 A EP 80107754A EP 80107754 A EP80107754 A EP 80107754A EP 0031514 A1 EP0031514 A1 EP 0031514A1
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EP
European Patent Office
Prior art keywords
heating coils
groove
carrier body
heating
grooves
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
EP80107754A
Other languages
German (de)
French (fr)
Other versions
EP0031514B1 (en
Inventor
Gerhard Gössler
Eugen Wilde
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
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Publication date
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Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT80107754T priority Critical patent/ATE13793T1/en
Publication of EP0031514A1 publication Critical patent/EP0031514A1/en
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Publication of EP0031514B1 publication Critical patent/EP0031514B1/en
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Classifications

    • 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
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49083—Heater type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
    • Y10T29/49133—Assembling to base an electrical component, e.g., capacitor, etc. with component orienting
    • Y10T29/49135—Assembling to base an electrical component, e.g., capacitor, etc. with component orienting and shaping, e.g., cutting or bending, etc.
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49147—Assembling terminal to base
    • Y10T29/49151—Assembling terminal to base by deforming or shaping
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body

Definitions

  • the invention relates to electric radiant heaters, in particular for glass ceramic plates with a support body made of an electrically and heat-insulating material with grooves into which helical heating resistors are inserted.
  • the object of the invention is therefore to propose a radiant heater and method and device for its production, with which a secure fixing with little effort and without additional tools such as kit, .Cement or the like. is possible.
  • the determination can be made by pressing the heating coils into grooves in a shaped body, which have a small undersize compared to the heating coils.
  • the heating coils are pressed slightly into the groove side walls (possibly with a slight deformation of the heating coil cross section) and thus securely fixed.
  • An indentation into the base of the groove, in particular in the projections provided there, is also possible.
  • heating coils when inserting the heating coils into suitable grooves, to deform the heating coils, for example from a circular into an oval cross section, by pressing from above, the narrow ones Press the sides of the resulting oval into the groove side walls. It is also possible, after inserting the heating coils into suitable grooves, to press the webs provided between the grooves, ie in the area of the groove side walls somewhat above the coils, in such a way that a section overlapping the heating coils is produced. The heating coils can also be pressed into the groove side wall.
  • the pressing can be carried out both in the fully cured state of the carrier body, which consists of an insulating ceramic or fibrous material.
  • the carrier body which consists of an insulating ceramic or fibrous material.
  • the heating coils can be pressed in with very little resistance, so that the process can also be used for the thinnest heating coils.
  • Fig. 1 shows a radiant heater 11 which is arranged below a glass ceramic plate 12 which forms the cooking surface of a cooking appliance.
  • the radiant heater 11 is supported by springs 14 on a support structure 13, which may consist, for example, of a sheet metal recess. It serves to heat cooking vessels placed on the glass-ceramic plate 12, by means of radiation, which can penetrate part of the glass-ceramic plate and, on the other hand, heat it.
  • the radiant heater 11 consists of a normally. circular flat carrier shell 15 made of sheet metal, in which a carrier body 16 made of an electrically and thermally insulating material is introduced. It can consist of a ceramic or inorganic insulating material be made.
  • the carrier body 16 also has the shape of a flat circular shell with a substantially flat bottom 18 and a raised edge 17 which is pressed against the underside of the glass ceramic plate 12 under the action of the springs 14.
  • the carrier body 16 has spirally arranged grooves 19 in which electrical heating resistors in the form of heating coils 20 are located. Their arrangement and fastening in the grooves can be seen more clearly from the following drawing figures.
  • the heating resistors are connected to a domestic electrical network via a switch or controller.
  • FIG. 2 shows in detail the arrangement of the heating coils 20 in the grooves.
  • a heating coil with a circular coil cross section is introduced into a groove whose width corresponds to the outside diameter of the coil, while the depth is less than the coil diameter.
  • a elevations 31 are arranged centrally, which can either consist of a rib running in the longitudinal direction of the groove or of individual projections on the groove bottom.
  • the heating coils are now pressed into the groove in such a way that they rest on the groove side walls and are thus well guided laterally, but penetrate into the elevations 31. As a result, the heating coil is held in the lower area, in particular against displacements in the longitudinal direction of the groove and coil.
  • the elevations are thus deformed in such a way that a toothing is created between them and the heating coil.
  • the carrier body 16a deforms in the region of the elevations in such a way that a securing against falling out upwards also arises, which is advantageous but not as important as the fixing in the longitudinal direction.
  • the embodiment of Figure 3 has grooves 19 b, which are slightly narrower than the outer diameter of the heating coils.
  • the groove bottom 22 b is flat.
  • the heating coils 20 When the heating coils 20 are pressed in, they press laterally into the groove side walls 21b, so that indentations 23 are formed there, which in turn bring about a particularly good fixing in the longitudinal direction of the groove.
  • the depth of the groove is again less than the outer diameter of the coil, so that the upper coil section protrudes on the support body 16 b, which results in good radiation conditions in this area.
  • the groove is preferably somewhat deeper than half the diameter of the heating coil, so that the widest point of the heating coil is still in the region of the indentations 23.
  • the carrier body 16 c is shown in a further embodiment after the heating coils 20 have been inserted, but before their final fixing.
  • a groove 19 c the width of which corresponds to the outer diameter of the heating coils 20, which have a circular cross section when inserted, and whose depth is between half and full coil diameter, the heating coils are laid. Thereafter, the heating coils are acted on with a tool 24, which has the shape of a plate with downwardly projecting, in the exemplary embodiment triangularly shaped ribs 25 which extend in the longitudinal direction centrally over the grooves 19c.
  • k ommen characterized the heating coils, a shape corresponding to a lying, rounded B, said lying on the open groove side outer spiral portion 26 of the deformed heating coils 20 c has an indentation.
  • the overall shape of the coil is widened, so that it digs into the side walls 21 of the groove 19 c and forms indentations 23 c there, which, as in the embodiment according to FIG. 3, ensure the fixing of the heating coils.
  • ribs of any desired basic shape can be used, so that the helix which is most favorable in terms of the definition and the radiation properties is obtained Have shapes made, for example a flat oval.
  • the inflection in section 26, however, has the advantage that a larger section of the heating coils is located on the upper side directly facing the glass ceramic plate.
  • a carrier body 16 d is also shown before its completion.
  • the grooves 19 d correspond to those according to FIG. 4, however the carrier body 16 d in FIG. 6 is formed from the ceramic or fiber-like mass, but has not yet been dried or fired, as a result of which it obtains its final hardness.
  • the heating coils 20 are suitable, but without indentations in the grooves 19 d.
  • FIG. 7 shows the same carrier body 16 d after drying or firing.
  • a shrinkage occurs in the material of the carrier body, i.e. the carrier body shrinks.
  • grooves 19 d according to Figure 6 reduced in their dimensions to those of the groove 19 d 'according to Figure 7.
  • the dimensions of the heating coils which are not influenced by the hardening, are therefore pressed into the side walls 21 d of the grooves and form impressions 23 d there, which have the same effect as in FIGS. 3 and 5.
  • small deformations of the heating coils as a result of the lateral indentation which, however, can be prevented, in particular in FIG.
  • FIG. 8 also shows a manufacturing stage of a carrier body 16 e, in which the grooves 19 e are substantially wider than they are deep, so that heating coils 20 e with a flat oval coil cross section could largely be inserted therein.
  • a tool 27 which has triangular projections 28 on its underside, but which are arranged centrally above the webs 90, is inserted into these webs 29 acts so that apart in the manner of a rivet head 30 (Fig.9) and thus define the heating coils 20 e, which remain essentially unchanged in shape.
  • the rivet head-like deformations 30 form a particularly good safeguard against the heating coils 20 e falling out.
  • the deformation between FIGS. 8 and 9 can follow in the already hardened or wet state, the shrinkage in the latter case (method according to FIGS. 6 and 7) helping to determine it.
  • the fixing methods according to the individual described embodiments are particularly advantageous in their combination, especially when it comes to fixing very thin wires, which are also particularly critical with regard to creep.
  • the fixing can be carried out with fewer fuses; in this case, for example, the partitions between the grooves can also be partially omitted or only partially present. This improves the heat transfer conditions.
  • the depth of the indentations of the heating coils in the walls of the groove consisting of the side and bottom walls depend on the winding diameter of the wire load and the specific load on the heated surface and the wire thickness.
  • the heating coils are also protected against falling over. This could occur if the wire forming the heating coils loses so much strength at high temperatures that the individual turns of the coils fall laterally onto one another unless they are supported.
  • the type of shaped body will also have to be taken into account. So you become, for example, with impressions
  • the types of fixing made prefer a relatively soft molded body made of fibrous material, while in the embodiment according to FIGS. 6 and 7 a ceramic material that is hard after firing is primarily suitable.
  • the heating coils can also be introduced into the carrier body, which has been pre-dried or pre-hardened but has not yet been fully heard.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Electric Ovens (AREA)
  • Surface Heating Bodies (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Cookers (AREA)

Abstract

Das Verfahren zur Herstellung eines elektrischen Strahlheizkörpers (11), der insbesondere für die Heizung von Glaskeramik-Kochplatten (12) bestimmt ist, besteht darin, daß wendelförmige Heizwiderstände (20) in spiralförmigen Nuten (19) so eingelegt oder eingedrückt werden, daß der Trägerkörper (16) oder die Heizwendeln (20) selbst sich verformen und damit am Trägerkörper (16) festgelegt werden. Sie dringen dabei in Wand- oder Bodenbereiche der Nut (19) ein oder werden von Teilen des Trägerkörpers (16) auf andere Weise durch formschlüssigen Eingriff festgelegt. Eine Vorrichtung zur Durchführung dieses Verfahrens besitzt ein Werkzeug (24, 27) mit Rippen (25, 28), die den Trägerkörper (16e) oder die Heizwendeln (20, 20c) zur formschlüssigen Festlegung verformen. Es entsteht dabei ein Strahlheizkörper, dessen trägerkörper (16) im Nutbereich der Heizwendeln (20) teilweise umgreifende Verformungen hat.The method for producing an electric radiant heater (11), which is intended in particular for heating glass ceramic hot plates (12), consists in that helical heating resistors (20) are inserted or pressed into spiral grooves (19) in such a way that the carrier body (16) or the heating coils (20) deform themselves and are thus fixed on the carrier body (16). They penetrate into the wall or floor areas of the groove (19) or are fixed by parts of the carrier body (16) in another way by positive engagement. A device for carrying out this method has a tool (24, 27) with ribs (25, 28) which deform the support body (16e) or the heating coils (20, 20c) for positive locking. The result is a radiant heater, the support body (16) of which partially encompasses deformations in the groove area of the heating coils (20).

Description

Die Erfindung bezieht sich auf elektrische Strahlheizkörper, insbesondere für Glaskeramikplatten mit einem Trägerkörper aus einem elektrisch- und wärmeisolierenden Material mit Nuten, in die wendelförmige Heizwiderstände eingelegt werden.The invention relates to electric radiant heaters, in particular for glass ceramic plates with a support body made of an electrically and heat-insulating material with grooves into which helical heating resistors are inserted.

Bei derartigen Strahlheizkörpern ist es stets ein Problem, die Heizwendeln in den Nuten so festzulegen, daß sie während des Transportes und der Benutzung der Strahlheizkörper einwandfrei fixiert sind. Dabei ist es wichtig, daß die Wendeln nicht nur gegen Herausfallen gesichert sind, sondern auch in Längsrichtung der Wendeln bzw. Nuten nicht zum Verschieben (kriechen) neigen. Die thermischen Bewegungen beim Aufheizen und Abkühlen unterstützen die Kriechneigung, durch die einzelne Abschnitte der Wendeln sich dichter zusammenschließen, während andere sich auseinanderziehen. Dadurch tritt in den verdichteten Bereichen eine stärkere Aufheizung ein, die zu einem frühzeitigen Ausfall des Heizwiderstandes führt.With such radiant heaters, it is always a problem to fix the heating coils in the grooves so that they are properly fixed during transport and use of the radiant heaters. It is important that the spirals are not only secured against falling out, but also do not tend to move (creep) in the longitudinal direction of the spirals or grooves. The thermal movements during heating and cooling support the tendency to creep, as a result of which individual sections of the coils close together while others pull apart. This results in a stronger heating in the densified areas, which leads to an early failure of the heating resistor.

Bisher wurden derartige Heizwendeln in den Nuten durch hitzebeständigen Zement oder Kit festgelegt. Wollte man die Nuten so formen, daß schon bei der Herstellung des Trägerkörpers Vorsprünge bzw. Hinterschneidungen entstehen, so wäre das Einlegen der Heizwendeln sehr schwierig.So far, such heating coils have been fixed in the grooves by means of heat-resistant cement or kit. If one wanted to shape the grooves in such a way that protrusions or undercuts were created during the manufacture of the carrier body, the insertion of the heating coils would be very difficult.

Aufgabe der Erfindung ist es daher, einen Strahlheizkörper sowie Verfahren und Vorrichtung zu seiner Herstellung vorzuschlagen, mit denen eine sichere Festlegung mit geringem Arbeitsaufwand und ohne zusätzliche Hilfsmittel wie Kit, .Zement o.dgl. möglich ist.The object of the invention is therefore to propose a radiant heater and method and device for its production, with which a secure fixing with little effort and without additional tools such as kit, .Cement or the like. is possible.

Diese Aufgabe wird durch die kennzeichnenden Merkmale der Ansprüche 1,10 bzw. 11 gelöst.This object is solved by the characterizing features of claims 1, 10 and 11 respectively.

Durch diese Maßnahmen werden also die Heizwendeln im Bereich der Nut durch Eindringen in das Material des Trägerkörpers selbst festgelegt. Die Festlegung selbst erfolgt unmittelbar bei der Einbringung der Heizwendeln bzw. im Anschluß daran und macht keinen wesentlichen zeitlichen Mehraufwand. Die Werkzeuge,die-zum Einpressen bzw. Verpressen verwendet werden, können diese Arbeitsgänge weitgehend in den Vorgang des Wendeleinlegens integrieren.These measures therefore fix the heating coils in the area of the groove by penetrating into the material of the carrier body itself. The determination itself takes place immediately when the heating coils are inserted or afterwards and does not require any significant additional time. The tools that are used for pressing in or pressing in can largely integrate these work steps into the process of inserting the helix.

Die Festlegung kann durch Einpressen der Heizwendeln in Nuten eines Formkörpers erfolgen, die ein geringes Untermaß gegenüber den Heizwendeln haben. Dabei werden(ggf.unter leichter Verformung des Heizwendelquerschnittes) die Heizwendeln leicht in die Nutseitenwände hineingedrückt und so sicher festgelegt. Auch eine Eindrückung in den Nutgrund, insbesonde;e in dort vorgesehene Erhebungen,ist möglich.The determination can be made by pressing the heating coils into grooves in a shaped body, which have a small undersize compared to the heating coils. The heating coils are pressed slightly into the groove side walls (possibly with a slight deformation of the heating coil cross section) and thus securely fixed. An indentation into the base of the groove, in particular in the projections provided there, is also possible.

Es ist auch vorteilhaft möglich ,beim Einlegen der Heizwendeln in passende Nuten die Heizwendeln beispielsweise von einem kreisförmigen in einen ovalen Querschnitt durch Verpressen von oben her zu verformen, wobei sich die schmalen Seiten des entstehenden Ovals in die Nutseitenwände hineindrücken. Es ist ferner möglich, nach dem Einlegen der Heizwendeln in passende Nuten die zwischen den Nuten vorgesehenen Stege,d.h. im Bereich der Nutseitenwände etwas oberhalb der Wendeln,so zu verpressen, daß ein die Heizwendeln übergreifender Abschnitt entsteht. Auch dabei kann eine Eindrückung der Heizwendeln in die Nutseitenwand vorgesehen werden.It is also advantageously possible, when inserting the heating coils into suitable grooves, to deform the heating coils, for example from a circular into an oval cross section, by pressing from above, the narrow ones Press the sides of the resulting oval into the groove side walls. It is also possible, after inserting the heating coils into suitable grooves, to press the webs provided between the grooves, ie in the area of the groove side walls somewhat above the coils, in such a way that a section overlapping the heating coils is produced. The heating coils can also be pressed into the groove side wall.

Bei diesen Ausführungsformen kann die Einpressung sowohl in fertig ausgehärtetem Zustand des Trägerkörpers, der aus einem isolierenden keramischen oder fasrigen Material besteht, vorgenommen werden. Es ist aber auch möglich, die Einpressung bzw. Verpressung vorzunehmen, bevor der Trägerkörper, beispielsweise durch Brennen oder Trocknen ausgehärtet ist.In diesem Falle ist das Einpressen der Heizwendeln mit sehr wenig Widerstand möglich, so daß das Verfahren auch für dünnste Heizwendeln brauchbar ist. Es ist jedoch auch möglich, die Heizwendeln in passende Nuten des noch nicht ausgehärteten, noch feuchten Trägerkörpers einzulegen und dann den Aushärtungs- bzw. Brennvorgang vorzunehmen. Durch das Schwinden des Materials des Trägerkörpers erfolgt dann eine Verringerung auch der Nut-Abmessungen, so daß die Spirale sich in deren Wandungen einpreßt.In these embodiments, the pressing can be carried out both in the fully cured state of the carrier body, which consists of an insulating ceramic or fibrous material. However, it is also possible to press in or press in before the carrier body has hardened, for example by firing or drying. In this case, the heating coils can be pressed in with very little resistance, so that the process can also be used for the thinnest heating coils. However, it is also possible to insert the heating coils into suitable grooves in the not yet cured, still moist support body and then to carry out the curing or firing process. The shrinkage of the material of the carrier body then also results in a reduction in the groove dimensions, so that the spiral is pressed into the walls thereof.

Es ist grundsätzlich bei allen Ausführungsformen möglich, die Festlegung durch Eindringen in die Nutwandungen über die gesamte Länge der Heizwendeln vorzunehmen. Es ist jedoch auch möglich, durch Vorsehen entsprechender Vorsprünge und Ausnehmungen in den Nutwandungen die Festlegung nur im gewissen Längsabständen abschnittsweise vorzunehmen, wenn beispielsweise aufgrund großer Drahtstärke die Stabilität der Heizwendeln groß genug ist, um in den Zwischenräumen auch ohne Festlegung auszukommen.In principle, it is possible in all embodiments to make the determination by penetrating the groove walls over the entire length of the heating coils. However, it is also possible, by providing corresponding projections and recesses in the groove walls, to make the determination only in certain longitudinal distances in sections, for example if the stability of the heating coils is large enough to get by without gaps in the interspaces due to the large wire thickness.

Weitere Vorteile und Merkmale gehen aus den Unteransprüchen und der Beschreibung im Zusammenhang mit den Zeichnungen hervor. Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

  • Fig. 1 einen schematischen Schnitt durch einen Strahlheizkörper und einen Teil einer Glaskeramik-Kochstelle,
  • Fig. 2 einen Detailschnitt durch eine Ausführungsform,
  • Fig. 3 einen Detailschnitt durch eine weitere Ausführungsform,
  • Fig. 4 und 5, jeweils zwei Herstellungsschritte
  • 6 und 7 weiterer Ausführungsformen. sowie8 und 9
Further advantages and features emerge from the subclaims and the description in connection with the drawings. Embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
  • 1 shows a schematic section through a radiant heater and part of a glass ceramic hob,
  • 2 shows a detail section through an embodiment,
  • 3 shows a detail section through a further embodiment,
  • 4 and 5, two manufacturing steps each
  • 6 and 7 of further embodiments. as well as 8 and 9

Fig. 1 zeigt einen Strahlheizkörper 11, der unterhalb einer Glaskeramikplatte 12 angeordnet ist, die die Kochfläche eines Kochgerätes bildet. Der Strahlheizkörper 11 ist durch Federn 14 an einerTrägerkonstruktion 13 abgestützt, die beispielsweise aus einer Blechmulde bestehen kann. Sie dient dazu, auf die Glaskeramikplatte 12 gestellte Kochgefäße zu beheizen, und zwar mittels Strahlung, die die Glaskeramikplatte zu einem Teil durchdringen kann und sie andererseits erwärmt.Fig. 1 shows a radiant heater 11 which is arranged below a glass ceramic plate 12 which forms the cooking surface of a cooking appliance. The radiant heater 11 is supported by springs 14 on a support structure 13, which may consist, for example, of a sheet metal recess. It serves to heat cooking vessels placed on the glass-ceramic plate 12, by means of radiation, which can penetrate part of the glass-ceramic plate and, on the other hand, heat it.

Der Strahlheizkörper 11 besteht aus einer normalerweise . kreisrunden flachen Trägerschale 15 aus Blech, in der ein Trägerkörper 16 aus einem elektrisch und thermisch isolierenden Material eingebracht ist. Er kann aus einer keramischen oder aus anorganischen Fasern bestehen Isoliermasse hergestellt sein. Der Trägerkörper 16 hat ebenfalls die Form einer flachen kreisrunden Schale mit einem im wesentlichen flachen Boden 18 und einem hochstehenden Rand 17, der unter der Wirkung der Federn 14 an die Unterseite der Glaskeramikplatte 12 angepreßt wird.The radiant heater 11 consists of a normally. circular flat carrier shell 15 made of sheet metal, in which a carrier body 16 made of an electrically and thermally insulating material is introduced. It can consist of a ceramic or inorganic insulating material be made. The carrier body 16 also has the shape of a flat circular shell with a substantially flat bottom 18 and a raised edge 17 which is pressed against the underside of the glass ceramic plate 12 under the action of the springs 14.

Der Trägerkörper 16 hat beim Ausführungsbeispiel spiralig angeordnete Nuten 19, in denen elektrische Heizwiderstände in Form von Heizwendeln 20 liegen. Ihre Anordnung und Befestigung in den Nuten geht aus den folgenden Zeichnungsfiguren deutlicher hervor. Die Heizwiderstände werden über einen Schalter bzw. Regler an ein elektrisches Haushaltsnetz angeschlossen.In the exemplary embodiment, the carrier body 16 has spirally arranged grooves 19 in which electrical heating resistors in the form of heating coils 20 are located. Their arrangement and fastening in the grooves can be seen more clearly from the following drawing figures. The heating resistors are connected to a domestic electrical network via a switch or controller.

Fig.2 zeigt im Detail die Anordnung der Heizwendeln 20 in den Nuten. Bei dieser Ausführungsform wird eine Heizwendel mit kreisrundem Wendelquerschnitt in eine Nut eingebracht, deren Breite dem Außendurchmesser der Wendel entspricht, während die Tiefe geringer ist als der Wendeldurchmesser. Am Nutboden 22 der Nut 19 a sind Erhebungen 31 mittig angeordnet, die entweder aus einer in Nutlängsrichtung durchlaufenden Rippe oder aus einzelnen Vorsprüngen am Nutboden bestehen können. Die Heizwendeln sind nun so in die Nut eingepreßt, daß sie an den Nutseitenwänden anliegen und somit seitlich gut geführt sind, jedoch in die Erhebungen 31 eindringen. Dadurch wird die Heizwendel im unteren Bereich festgehalten, und zwar insbesondere gegen Verschiebungen in Längsrichtung der Nut und Wendel. Die Erhebungen werden also derart verformt,daß eine Verzahnung zwischen ihnen und der Heizwendel entsteht. Außer der Festlegung in Nutlängsrichtung verformt sich der Trägerkörper 16 a im Bereich der Erhebungen so, daß auch eine Sicherung gegen Herausfallen nach Oben entsteht, die vorteilhaft, jedoch nicht so wichtig ist, wie die Festlegung in Längsrichtung.2 shows in detail the arrangement of the heating coils 20 in the grooves. In this embodiment, a heating coil with a circular coil cross section is introduced into a groove whose width corresponds to the outside diameter of the coil, while the depth is less than the coil diameter. On the groove bottom 22 of the groove 19 a elevations 31 are arranged centrally, which can either consist of a rib running in the longitudinal direction of the groove or of individual projections on the groove bottom. The heating coils are now pressed into the groove in such a way that they rest on the groove side walls and are thus well guided laterally, but penetrate into the elevations 31. As a result, the heating coil is held in the lower area, in particular against displacements in the longitudinal direction of the groove and coil. The elevations are thus deformed in such a way that a toothing is created between them and the heating coil. In addition to the fixing in the longitudinal direction of the groove, the carrier body 16a deforms in the region of the elevations in such a way that a securing against falling out upwards also arises, which is advantageous but not as important as the fixing in the longitudinal direction.

Die Ausführungsform nach Fig.3 besitzt Nuten 19 b, die etwas schmaler sind als der Außendurchmesser der Heizwendeln.The embodiment of Figure 3 has grooves 19 b, which are slightly narrower than the outer diameter of the heating coils.

Der Nutboden 22 b ist eben. Beim Einpressender Heizwendeln 20 pressen diese sich seitlich in die Nutseitenwände 21 b ein, so daß dort Eindrückungen 23 entstehen, die wiederum eine besonders gute Festlegung in Nutlängsrichtung bewirken. Die Tiefe der Nut ist wiederum geringer als der Außendurchmesser der Wendel, so daß der obere Wendel abschnitt auf dem Trägerkörper 16 b hinausragt, was gute Abstrahlungsverhältnisse in diesem Bereich ergibt. Vorzugsweise ist die Nut jedoch etwas tiefer als der halbe Durchmesser der Heizwendel, so daß die breiteste Stelle der Heizwendel noch im Bereich der Eindrückungen 23 liegt.The groove bottom 22 b is flat. When the heating coils 20 are pressed in, they press laterally into the groove side walls 21b, so that indentations 23 are formed there, which in turn bring about a particularly good fixing in the longitudinal direction of the groove. The depth of the groove is again less than the outer diameter of the coil, so that the upper coil section protrudes on the support body 16 b, which results in good radiation conditions in this area. However, the groove is preferably somewhat deeper than half the diameter of the heating coil, so that the widest point of the heating coil is still in the region of the indentations 23.

In Fig. 4 ist der Trägerkörper 16 c bei einer weiteren Ausführungsform nach dem Einlegen der Heizwendeln 20, jedoch vor deren endgültiger Festlegung dargestellt. In eine Nut 19 c, die in ihrer Breite dem Außendurchmesser der Heizwendeln 20 entspricht, die beim Einlegen einen kreisrunden Querschnitt haben, und deren Tiefe zwischen dem halben und vollen Wendeldurchmesser liegt, sind die Heizwendeln engelegt. Danach wird mit einem Werkzeug 24, das die Form einer Platte mit nach unten vorragenden, im Ausführungsbeispiel dreieckig geformten Rippen 25 hat, die in Längsrichtung mittig über den Nuten 19 c verlaufen, auf die Heizwendeln eingewirkt.4, the carrier body 16 c is shown in a further embodiment after the heating coils 20 have been inserted, but before their final fixing. In a groove 19 c, the width of which corresponds to the outer diameter of the heating coils 20, which have a circular cross section when inserted, and whose depth is between half and full coil diameter, the heating coils are laid. Thereafter, the heating coils are acted on with a tool 24, which has the shape of a plate with downwardly projecting, in the exemplary embodiment triangularly shaped ribs 25 which extend in the longitudinal direction centrally over the grooves 19c.

Wie aus Fig.5 ersichtlich ist,bekommen dadurch die Heizwendeln eine Form,die einem liegenden, abgerundeten B entspricht, wobei der an der offenen Nutseite liegende äußere Wendelabschnitt 26 der verformten Heizwendeln 20 c eine Eindrückung hat. Durch diese Verformung wird die Wendel in ihrer Gesamtform verbreitert, so daß sie sich in die Seitenwände 21 der Nut 19 c eingräbt und dort Eindrückungen 23 c bildet, die, wie beim Ausführungsbeispiel nach Fig.3,für die Festlegung der Heizwendeln sorgen. Statt der im Querschnitt dreiecksförmigen Rippen 25 können Rippen jeder beliebigen Grundform genommen werden, so daß sich jeweils die von der Festlegung und von den Abstrahlungseigenschaften her günstigsten Wendelformen herstellen lassen, beispielsweise auch ein flaches Oval. Die Einbiegung im Abschnitt 26 hat jedoch den Vorteil, daß ein größerer Abschnitt der Heizwendeln an der oberen, unmittelbar der Glaskeramikplatte zugewandten Seite liegt.As is apparent from Fig.5 BE, k ommen characterized the heating coils, a shape corresponding to a lying, rounded B, said lying on the open groove side outer spiral portion 26 of the deformed heating coils 20 c has an indentation. As a result of this deformation, the overall shape of the coil is widened, so that it digs into the side walls 21 of the groove 19 c and forms indentations 23 c there, which, as in the embodiment according to FIG. 3, ensure the fixing of the heating coils. Instead of the triangular ribs 25 in cross section, ribs of any desired basic shape can be used, so that the helix which is most favorable in terms of the definition and the radiation properties is obtained Have shapes made, for example a flat oval. The inflection in section 26, however, has the advantage that a larger section of the heating coils is located on the upper side directly facing the glass ceramic plate.

In Fig. 6 ist ebenfalls ein Trägerkörper 16 d vor seiner Fertigstellung gezeigt. Die Nuten 19 d entsprechen denen nach Fig. 4, jedoch ist der Trägerkörper 16 d in Figur 6 zwar aus der keramischen oder faserartigen Masse geformt, jedoch noch nicht getrocknet bzw. gebrannt, wodurch er seine Endhärte bekommt. In Fig.6 liegen die Heizwendeln 20 passend, jedoch ohne Eindrückungen in den Nuten 19 d.In Fig. 6, a carrier body 16 d is also shown before its completion. The grooves 19 d correspond to those according to FIG. 4, however the carrier body 16 d in FIG. 6 is formed from the ceramic or fiber-like mass, but has not yet been dried or fired, as a result of which it obtains its final hardness. In Figure 6, the heating coils 20 are suitable, but without indentations in the grooves 19 d.

In Fig. 7 ist der gleiche Trägerkörper 16 d nach dem Trocknen bzw. Brennen gezeigt. Beim Brennen entsteht in dem Material des Trägerkörpers eine Schwindung, d.h. der Trägerkörper schrumpft zusammen. Dabei werden u.a. auch Nuten 19 d nach Fig.6 in ihren Abmessungen auf diejenigen der Nut 19 d' nach Fig.7 verringert. Die in ihren Maßen durch die Aushärtung nicht beeinflußten Heizwendeln drücken sich daher in die Seitenwände 21 d der Nuten ein und bilden dort Eindrükkungen 23 d,die die gleiche Wirkung haben wie in den Fig.3 und 5. Wie in Fig.3 können sich auch hier geringe Verformungen der Heizwendeln infolge des seitlichen Eindrückens einstellen, die jedoch, insbesondere in Figur 3 durch eine entsprechende Abstützung beim Eindrücken verhindert werden können.7 shows the same carrier body 16 d after drying or firing. When burning, a shrinkage occurs in the material of the carrier body, i.e. the carrier body shrinks. Among other things, also grooves 19 d according to Figure 6 reduced in their dimensions to those of the groove 19 d 'according to Figure 7. The dimensions of the heating coils, which are not influenced by the hardening, are therefore pressed into the side walls 21 d of the grooves and form impressions 23 d there, which have the same effect as in FIGS. 3 and 5. As in FIG set small deformations of the heating coils as a result of the lateral indentation, which, however, can be prevented, in particular in FIG.

In Fig. 8 ist ebenfalls eine Fertigungsstufe eines Trägerkörpers 16 e gezeigt, bei dem die Nuten 19 e wesentlich breiter als tief sind, so daß darin weitgehend passend Heizwendeln 20 e mit einem flachovalen Wendelquerschnitt eingelegt werden konnten. Nach dem Einlegen der Heizwendeln wird mit einem Werkzeug 27, das an seiner Unterseite dreiecksförmige Vorsprünge 28 besitzt, die jedoch mittig über den Stegen 90 angeordnet sind, auf diese Stege 29 eingewirkt, so daß sich nach Art eines Nietkopfes 30 auseinanderdrücken (Fig.9) und damit die im wesentlichen in ihrer Form unverändert bleibenden Heizwendeln 20 e festlegen. Außer der Festlegung in Längsrichtung,die durch ein nach innen wandern der Seitenwände 21 e geschieht, bilden die nietkopfartigen Verformungen 30 eine besonders gute Sicherung gegen Herausfallen der Heizwendeln 20 e. Die Verformung zwischen den Figuren 8 und 9 kann im bereits ausgehärteten oder auch nassen Zustand folgen, wobei im letzteren Falle die Schwindung (Verfahren nach Fig.6 und 7) bei der Festlegung mithilft.8 also shows a manufacturing stage of a carrier body 16 e, in which the grooves 19 e are substantially wider than they are deep, so that heating coils 20 e with a flat oval coil cross section could largely be inserted therein. After the heating coils have been inserted, a tool 27, which has triangular projections 28 on its underside, but which are arranged centrally above the webs 90, is inserted into these webs 29 acts so that apart in the manner of a rivet head 30 (Fig.9) and thus define the heating coils 20 e, which remain essentially unchanged in shape. In addition to the fixing in the longitudinal direction, which is caused by an inward migration of the side walls 21 e, the rivet head-like deformations 30 form a particularly good safeguard against the heating coils 20 e falling out. The deformation between FIGS. 8 and 9 can follow in the already hardened or wet state, the shrinkage in the latter case (method according to FIGS. 6 and 7) helping to determine it.

Besonders vorteilhaft sind die Festlegungsverfahren nach den einzelnen beschriebenen Ausführungsformen in ihrer Kombination, insbesondere wenn es um die Festlegung sehr dünner Drähte geht, die auch bezüglich des Kriechens besonders kritisch sind. Bei relativ dicken Drähten kann dagegen die Festlegung mit weniger Sicherungen erfolgen, dabei können beispielsweise auch die Zwischenwände zwischen den Nuten teilweise weggelassen werden oder nur abschnittsweise vorhanden sein. Dadurch werden die Wärmeübertragungsverhältnisse verbessert. Insbesondere bei der Ausführungsform nach den Fig.8 und 9 ist es bei dickeren Drähten möglich,die Verformungen 30 nur abschnittsweise vorzusehen. Die Tiefe der Eindrückungen der Heizwendeln in die aus Seiten- und Bodenwand bestehenden Wandungen der Nut sind abhängig vom Wickeldurchmesser der Drahtbelastung und der spezifischen Belastung der beheizten Fläche sowie der Drahtstärke. Die Heizwendeln sind bei den Ausführungsformen auch gegen Umfallen geschützt. Dies könnte auftreten, wenn der die Heizwendeln bildende Draht bei hohen Temperaturen so viel an Festigkeit verliert, daß die einzelnen Windungen der Wendeln seitlich aufeinanderfallen, sofern sie nicht gestützt sind.The fixing methods according to the individual described embodiments are particularly advantageous in their combination, especially when it comes to fixing very thin wires, which are also particularly critical with regard to creep. In the case of relatively thick wires, on the other hand, the fixing can be carried out with fewer fuses; in this case, for example, the partitions between the grooves can also be partially omitted or only partially present. This improves the heat transfer conditions. In particular in the embodiment according to FIGS. 8 and 9, it is possible with thicker wires to provide the deformations 30 only in sections. The depth of the indentations of the heating coils in the walls of the groove consisting of the side and bottom walls depend on the winding diameter of the wire load and the specific load on the heated surface and the wire thickness. In the embodiments, the heating coils are also protected against falling over. This could occur if the wire forming the heating coils loses so much strength at high temperatures that the individual turns of the coils fall laterally onto one another unless they are supported.

Bei der Auswahl der einzelnen Ausführungsformen für die Festlegung wird auch die Art des Formkörpers zu berücksichtigen sein. So wird man beispielsweise bei den durch Eindrückungen im fertig ausgehärteten Zustand vorgenommenen Festlegungsarten einen relativ weichen, aus fasrigem Material hergestellten Formkörper vorziehen, während bei der Ausführungsform nach den Figuren 6 und 7 in erster Linie ein nach dem Brennen hartes keramisches Material in Frage kommt. Dabei kann die Einbringung der Heizwendeln auch in den zwar vorgetrockneten bzw. vorgehärteten, aber noch nicht ganz durchgehörteten Trägerkörper erfolgen.When selecting the individual embodiments for the definition, the type of shaped body will also have to be taken into account. So you become, for example, with impressions In the fully hardened state, the types of fixing made prefer a relatively soft molded body made of fibrous material, while in the embodiment according to FIGS. 6 and 7 a ceramic material that is hard after firing is primarily suitable. The heating coils can also be introduced into the carrier body, which has been pre-dried or pre-hardened but has not yet been fully heard.

Claims (13)

1. Verfahren zur Herstellung eines elektrischen Strahlheizkörpers, insbesondere für Glaskeramik-Kochplatten, mit einem Trägerkörper aus einem elektrisch- und wärmeisolierenden Material mit Nuten, in die wendelförmige Heizwiderstände eingelegt werden, dadurch gekennzeichnet, daß der Trägerkörper (16,16 a46 e) und/oder die Heizwendeln (20,20b-20e) während oder nach dem Einbringen der Heizwendeln zu deren Festlegung verformt werden.1. A method for producing an electric radiant heater, in particular for glass ceramic hotplates, with a support body made of an electrically and heat-insulating material with grooves into which helical heating resistors are inserted, characterized in that the support body (16, 16 a46 e) and / or the heating coils (20, 20b-20e) are deformed during or after the heating coils have been inserted in order to fix them. 2.Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Verformung des Trägerkörpers (16a,16b) durch die Einpressung der Heizwendeln (20) vorgenommen wird.2.The method according to claim 1, characterized in that the deformation of the carrier body (16a, 16b) is carried out by pressing in the heating coils (20). 3.Verfahren nach Anspruch 1 oder 2,dadurch gekennzeichnet, daß das Einlegen der Heizwendeln (20,20e) vor der endgültigen Verfestigung des Materials des Trägerkörpers (16d,16e) vorgenommen wird und die Verformung durch Schwinden des Trägerkörpers (16d,16e) geschieht.3.The method according to claim 1 or 2, characterized in that the insertion of the heating coils (20, 20e) before the final solidification of the material of the carrier body (16d, 16e) is carried out and the deformation takes place by shrinkage of the carrier body (16d, 16e). 4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Verformung der Heizwendeln (20c) durch eine Veränderung des Wendelquerschnittes nach ihrem Einlegen in die Nuten (19c) vorgenommen wird.4. The method according to claim 1 or 2, characterized in that the deformation of the heating coils (20c) is carried out by changing the coil cross-section after it has been inserted into the grooves (19c). 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Heizwendeln (20) mit kreisrundem Wendelquerschnitt eingelegt und durch Verpressen von der Nutaußenseite her verformt werden.5. The method according to claim 4, characterized in that the heating coils (20) are inserted with a circular helical cross-section and are deformed by pressing from the outside of the groove. 6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Heizwendeln (20) in Teile der Nutwandung (Nutseitenwände 21,21b und/oder Nutkrümmungen 22) eingedrückt werden.6. The method according to any one of the preceding claims, characterized in that the heating coils (20) in parts of the groove wall (groove side walls 21,21b and / or groove curvatures 22) are pressed. 7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die Teile der Nutwandung (21,21b,22),in die die Heizwendeln(20) eingedrückt werden, sich in Nutlängsrichtung in Abstand voneinander befinden.7. The method according to claim 6, characterized in that the parts of the groove wall (21, 21b, 22) into which the heating coils (20) are pressed are located at a distance from one another in the longitudinal direction of the groove. 8. Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß der Wendelquerschnitt zumindest nach der Verformung oval ist, wobei die kleinere Achse des Ovals in Abstrahlungsrichtung liegt.8. The method according to any one of claims 4 to 7, characterized in that the helical cross-section is oval at least after the deformation, the smaller axis of the oval lying in the radiation direction. 9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Verformung des Trägerkörpers (16e) durch Verpressen zumindest eines Teils des zwischen zwei benachbarten Nuten (19e) befindlichen Steges (29) des Trägerkörpers (16e) erfolgt.9. The method according to any one of the preceding claims, characterized in that the deformation of the carrier body (16e) is carried out by pressing at least a portion of the web (29) of the carrier body (16e) located between two adjacent grooves (19e). 10. Vorrichtung zur Herstellung von Strahlheizkörpern mit dem Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß ein Werkzeug (24,27) mit einer plattenförmigen Arbeitsfläche und Vorsprüngen bzw.Rippen (25, 28) vorgesehen ist, das gegen den Strahlheizkörper (11) preßbar ist, wobei die Vorsprünge bzw. Rippen (25,28) Teile des Trägerkörpers (16e) und/oder der Heizwendeln(20, 20c) verformen.10. Device for producing radiant heaters with the method according to any one of claims 1 to 9, characterized characterized in that a tool (24, 27) with a plate-shaped working surface and projections or ribs (25, 28) is provided which can be pressed against the radiant heater (11), the projections or ribs (25, 28) being parts of the Deform the support body (16e) and / or the heating coils (20, 20c). 11. Elektrischer Strahlheizkörper, insbesondere für Glaskeramikplatten mit einem Trägerkörper aus einem elektrisch-und wärmeisolierenden Material mit Nuten, in die wendelförmige Heizwiderstände eingelegt sind, dadurch gekennzeichnet, daß der Trägerkörper (16,16a - 16 e)im Nutbereich Verformungen (23,23 c,23 d) aufweist, die die Heizwendeln (20,20c,20e) teilweise umgreifen.11. Electric radiant heater, in particular for glass ceramic plates with a support body made of an electrically and heat-insulating material with grooves, are inserted into the helical heating resistors, characterized in that the support body (16,16a - 16 e) in the groove area deformations (23,23 c , 23 d) which partially surround the heating coils (20, 20c, 20e). 12. Strahlheizkörper nach Anspruch 11,dadurch gekennzeichnet, daß der Trägerkörper (16a - 16 e) in den Nutwandungen(21, 21 b,21 d,22) Eindrückungen (23, 23c,23d) aufweist, die der Form der Heizwendeln (20, 20c, 20e) entsprechen und in denen die Heizwendeln paßgenau aufgenommen sind.12. Radiant heater according to claim 11, characterized in that the carrier body (16a - 16 e) in the groove walls (21, 21 b, 21 d, 22) has indentations (23, 23c, 23d) which corresponds to the shape of the heating coils (20th , 20c, 20e) and in which the heating coils are accommodated with a precise fit. 13. Strahlheizkörper nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß der Trägerkörper (16, 16a - 16 e) aus einem während des Herstellungsvorganges härtbaren fasrigen oder keramischen Material besteht.13. Radiant heater according to claim 11 or 12, characterized in that the carrier body (16, 16a - 16 e) consists of a curable fibrous or ceramic material during the manufacturing process.
EP80107754A 1979-12-14 1980-12-09 Electric heating radiator, and process and apparatus for its manufacture Expired EP0031514B1 (en)

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DE19792950302 DE2950302A1 (en) 1979-12-14 1979-12-14 ELECTRIC RADIANT RADIATOR, METHOD AND DEVICE FOR PRODUCING IT

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EP0210575A1 (en) * 1985-07-31 1987-02-04 E.G.O. Elektro-Geräte Blanc u. Fischer Electrical radiant heating element for heating hot plates, and process and device for its manufacture
EP2056649A3 (en) * 2007-10-30 2009-11-04 E.G.O. Elektro-Gerätebau GmbH Holder for an electric heater and electric heating device and method for production

Also Published As

Publication number Publication date
ATE13793T1 (en) 1985-06-15
DE3070761D1 (en) 1985-07-18
EP0031514B1 (en) 1985-06-12
ES254990Y (en) 1982-05-01
DE2950302A1 (en) 1981-06-19
ES254990U (en) 1981-09-01
ZA807784B (en) 1981-12-30
GR71640B (en) 1983-06-20
US4380116A (en) 1983-04-19
YU314580A (en) 1983-02-28
AU6540080A (en) 1981-06-18
JPH0328031B2 (en) 1991-04-17
ES497675A0 (en) 1982-02-01
AU539828B2 (en) 1984-10-18
ES8202666A1 (en) 1982-02-01
JPS5693283A (en) 1981-07-28
YU39453B (en) 1984-12-31

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