EP1704937B1 - Récipient de cuisson et procédé de fabrication d'un tel récipient de cuisson - Google Patents

Récipient de cuisson et procédé de fabrication d'un tel récipient de cuisson Download PDF

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Publication number
EP1704937B1
EP1704937B1 EP05006319A EP05006319A EP1704937B1 EP 1704937 B1 EP1704937 B1 EP 1704937B1 EP 05006319 A EP05006319 A EP 05006319A EP 05006319 A EP05006319 A EP 05006319A EP 1704937 B1 EP1704937 B1 EP 1704937B1
Authority
EP
European Patent Office
Prior art keywords
induction
base
cookware
induction element
ferromagnetic
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.)
Not-in-force
Application number
EP05006319A
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German (de)
English (en)
Other versions
EP1704937A1 (fr
Inventor
Gerd Kloppsteck
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.)
Heinrich Berndes GmbH and Co KG
Original Assignee
Heinrich Berndes GmbH and Co KG
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 Heinrich Berndes GmbH and Co KG filed Critical Heinrich Berndes GmbH and Co KG
Priority to AT05006319T priority Critical patent/ATE435079T1/de
Priority to DE502005007613T priority patent/DE502005007613D1/de
Priority to EP05006319A priority patent/EP1704937B1/fr
Publication of EP1704937A1 publication Critical patent/EP1704937A1/fr
Application granted granted Critical
Publication of EP1704937B1 publication Critical patent/EP1704937B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/18—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like
    • B21D51/22—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like pots, e.g. for cooking

Definitions

  • the present invention relates to a cookware according to the preamble of claim 1. Furthermore, the present invention relates to a method for producing a cookware.
  • Cookware of the type mentioned are already known from the prior art in various variants and embodiments.
  • a basic prerequisite for a cookware to be used on an induction hob of an induction cooker and heated by induction is that at least partially a ferromagnetic material must be present on a lower side of the cookware.
  • a high-frequency alternating magnetic field is generated by an induction hob, in which a coil is arranged, which induces eddy currents in the bottom of the induction-suitable cookware, which heat energy is released in a known manner.
  • a ferromagnetic base is attached in a flat manner to an underside of the cooking utensil otherwise not intended for induction heating.
  • the ferromagnetic induction bottom can dissolve from the cookware, so that the cookware is unusable, at least for use on an induction hob.
  • the EP 0 688 526 A1 discloses a cup-shaped cooking appliance with a container bottom, to which a circuit board of good conductive metallic material and a circuit board cover are attached. In the bottom of the board cover a plurality of recesses are formed, in each of which a filler made of ferromagnetic steel sheet is fitted. Overall, the cooking appliance and in particular the board with the board cover is relatively expensive.
  • the object of the present invention is to provide a cookware of the type mentioned above that is suitable for induction cookers and that has a longer service life than the cooking utensils previously known from the prior art.
  • Another object of the present invention is to provide a method by which an induction-capable cookware can be manufactured easily and inexpensively.
  • the object is achieved by a cookware of the type mentioned above with the characterizing features of claim 1.
  • the base of the main body has at least one opening which penetrates the ground and into which the at least one ferromagnetic induction element is inserted.
  • the at least one induction element which in turn can penetrate the soil after insertion into its associated opening, causes the cookware, whose base body is made of a non-induction hearthable material, can also be used on an induction hob of an induction cooker.
  • the thickness of the at least one induction element preferably corresponds at least in sections substantially to the thickness of the base of the base body.
  • the at least one induction element is aligned with the portions of the bottom, the at least one Limit opening for receiving the at least one induction element laterally.
  • the induction element can be aligned on the outside and / or on the inside of the cookware with the adjacent portions of the floor.
  • the cookware comprises a plurality of ferromagnetic induction elements, wherein each of the induction elements is inserted into an associated opening of the soil.
  • the ferromagnetic induction elements are arranged concentrically in the bottom of the base body. It has been found that with the concentric arrangement of the induction elements around a common center of the floor, the efficiency of heat generation can be improved.
  • ferromagnetic induction elements can be provided in an advantageous embodiment that extend the ferromagnetic induction elements from a common center of the bottom radially outward. If, for example, substantially nub-like shaped induction elements are used, they can be arranged substantially star-shaped with respect to a common center.
  • the ferromagnetic induction element has on a lower side a plurality of induction segments, which are inserted in at least one opening of the base assigned to them.
  • the induction segments extend from a common center radially outward.
  • the induction segments can be arranged concentrically on the underside of the induction element.
  • the induction segments are formed integrally with the induction element.
  • the induction element can thus be formed as a substantially plate-shaped element, on the underside of the induction segments are formed. This substantially plate-shaped induction element can be relatively easily inserted from the inside into the openings of the soil. Thus, for example, thermal stresses that can occur due to different thermal expansion coefficients of the materials can be avoided. If the induction element is pressed under high pressure into the openings of the bottom, a cohesive material connection can be produced by friction welding.
  • the bottom of the body has a circumferential recess on which the induction element rests at least in sections.
  • the base body is made of a non-ferritic metal, in particular of aluminum or cast aluminum.
  • the base body is made of a non-metallic material, in particular of plastic, glass or ceramic.
  • a material connection is produced between the at least one induction element and the sections of the floor which laterally delimit the at least one opening.
  • the at least one induction element is pressed into the at least one opening of the bottom. If the at least one induction element is pressed under high pressure into the at least one opening of the base, a cohesive connection between the at least one induction element and the areas of the base of the base body can be generated by friction welding, which laterally surrounds the at least one opening of the base limit.
  • a base body is produced with a plurality of openings which penetrate the floor and into which an induction element is inserted in each case. It has been shown that it is advantageous for a particularly high efficiency in the heat generation, if at least about 60 percent of the available on a bottom of the cookware contact surface is filled by the induction elements.
  • a base body is produced with a plurality of openings which penetrate the bottom and into which at least one induction segment, which is arranged on a lower side of the induction element, is inserted. Also in this way can be achieved that about 60 percent of the total area of the underside of the cookware have a ferromagnetic material.
  • the induction element may also have a plurality of induction segments on its underside.
  • Fig. 1 Reference is made, in which a longitudinal section through a cookware 1 according to an embodiment is shown in which not all the features belonging to the invention are realized.
  • the cookware 1 shown in this first embodiment is a saucepan. Basically, the cookware 1, for example, a pan or the like.
  • the cookware 1 comprises a main body 2 which is made of a material which is not suitable for heating by an induction hob of an induction cooker. This means that the base body 2 of the cookware 1 on the induction hob of an induction cooker during its operation can not be heated directly.
  • the base body 2 may be made of a metallic material such as aluminum, cast aluminum or an aluminum alloy, copper or a copper alloy.
  • the main body 2 can according to a variant also be made of a non-metallic material such as glass, ceramic or plastic.
  • the base body 2 laterally delimits an interior 3, which can receive the food during use of the cookware 1.
  • the base body 2 has a bottom 4, which comprises a plurality of openings (not provided with reference numerals).
  • the openings completely penetrate the bottom 4 of the main body 2 and, with respect to their size and shape, are suitable for respectively receiving a correspondingly shaped induction element 5 made of a ferromagnetic material.
  • the cookware 1 a total of six separate induction elements 5, which are each received in an associated opening in the bottom 4 of the base body 2. It can be seen that the induction elements 5 are arranged concentrically around a center of the bottom 4 in this embodiment and extend radially outward from this center.
  • Each of the induction elements 5 is, as already mentioned above, made of a ferromagnetic material, so that the induction elements 5 can heat up during the operation of the cooking vessel 1 on an induction hob of an induction cooker.
  • the induction elements 5 may be made of steel, cast steel or chrome steel.
  • the induction elements 5 can also be made of other ferromagnetic materials such as Example be made of nickel or ferromagnetic alloys.
  • the main body 2 is first produced with the corresponding openings in the bottom 4, in each of which one of the induction elements 5 is subsequently used.
  • the induction elements 5 can be used in this embodiment of the cookware 1 either from below or from above (that is, from the interior 3) in the openings provided for the bottom 4 of the base body 2
  • each of the induction elements 5 can be pressed under high pressure into its associated opening, so that by friction welding a cohesive connection between the induction elements 5 and the portions of the bottom 4, which laterally delimit the respective openings for the induction elements 5, can be produced ,
  • the induction elements 5 can also be inserted into the corresponding openings in the base 4 and then fixed by soldering or an alternative cohesive joining process.
  • the ferromagnetic induction elements 5 can be designed as a solid body or as a hollow body. It has been found that an embodiment of the induction elements 5 as a hollow body can be advantageous in particular when the induction elements 5 are pressed into the openings of the bottom 4 and a cohesive material connection is produced by friction welding.
  • the induction elements 5 in this exemplary embodiment are aligned both on an inner side which faces the inner space 3 and on an outer side with the areas of the base 4 of the base body 2 which are directly adjacent to the induction elements 5. This ensures in particular that the underside of the cooking vessel 1 is substantially planar.
  • the adjacent to the interior 3 of the cooking vessel 1 surface of the induction elements 5 is sealed with a suitable coating.
  • all the induction elements 5 are made of the same material, thus on the underside of the cookware 1 at the positions at which the induction elements 5 are provided , comparable thermal conditions prevail. It can also be provided according to a variant, that the induction elements 5 are made of different ferromagnetic materials.
  • the induction elements 5 can also be configured substantially knob-like.
  • a longitudinal section through a cookware 1 according to one embodiment of the present invention is shown.
  • the cookware 1 is again a saucepan.
  • the cookware 1 according to this embodiment may be, for example, a pan or the like.
  • the main body 2 is made as in the first embodiment of a non-induction cooker suitable material, which is therefore not suitable for induction heating on an induction hob.
  • the base body 2 may be made of a metallic material such as aluminum, cast aluminum or an aluminum alloy, copper or a copper alloy.
  • the main body 2 may alternatively be made of non-metallic materials such as glass, ceramic or plastic.
  • the base 4 of the base body 2 comprises a substantially annular depression 40, on which an edge region of the ferromagnetic induction element 5 rests in sections.
  • the induction element 5 is in alignment with the sections of the bottom 4 immediately adjacent thereto.
  • Fig. 4 is a plan view of the cookware according to Fig. 3 shown.
  • the induction element 5 comprises on a bottom side a total of six induction segments 50 which extend outward from a common center point.
  • the geometric shape of the induction segments 50 can be chosen arbitrarily in principle. It can be provided, for example, that a plurality of substantially knob-like shaped induction segments is used, which can be arranged concentrically on the underside of the induction element 5 and can extend radially outwardly from the center of the induction element 5.
  • knob-like segments may have different diameters. For example, if relatively small knob-like induction segments are used with a relatively small diameter, a relatively large number of openings in the bottom 4 of the base body 2 must be made available, in which the knob-like induction segments can each engage.
  • the induction element 5 with the induction segments 50 on its underside is made of a ferromagnetic material.
  • the ferromagnetic materials mentioned in the first embodiment can be used. It is advantageous that both the induction element 5 and the induction segments 50 are made of the same ferromagnetic material in order to avoid thermal stresses that may occur due to different thermal expansion coefficients, if possible. In principle, however, the induction element 5 and the induction segments 50 can also be made of different ferromagnetic materials.
  • the induction element 5 with the induction segments 50 can be pressed in the manufacture of the cookware 1 again under high pressure in the correspondingly provided openings of the bottom 4 of the base body 2, which receive the induction segments 50 of the induction element 5.
  • a cohesive material connection can be made.
  • the induction element 5 is not, as known from the prior art, attached from the outside to an underside of the bottom, but from the interior 3 into the corresponding cut openings of the bottom 4 of the base body second used. This leads to an increased stability of the entire arrangement and prevents the induction element 5 from becoming detached from the base 4 of the base body 2 during prolonged operation, for example due to thermal stresses.
  • the induction element 5 can also be attached in the base 4 of the base body 2 with the aid of other joining methods known from the prior art, in particular by soldering.
  • the main body 2 is first again generated together with the corresponding openings in the bottom 4, which are to receive the induction element 5 with the induction segments 50 on the underside of a non-induction cooker suitable material. Subsequently, the induction element 5 is pressed together with the induction segments 50 under high pressure in the openings provided for the bottom 4. Due to the heat generated thereby by friction between the areas of the bottom 4, which laterally delimit the openings and the induction segments 50 and the base plate 5 is in turn made by friction welding a cohesive ge connection between the materials.
  • the induction element 5 and the induction segments 50 can also be designed in this embodiment as a solid body or as a hollow body.
  • substantially knob-like shaped induction segments 50 can be used, which can be arranged concentrically on the underside of the induction element and can extend radially outwardly from the center.
  • the induction segments 50 should occupy at least about 60% of the total available area on the underside of the cookware 1 in order to achieve sufficient efficiency in heat generation.
  • the adjacent to the interior 3 of the cooking vessel 1 surface of the induction element 5 is sealed with a suitable coating.
  • An advantage of the advantageous embodiment of the present invention presented here is that the cookware 1 can be used on an induction hob of an induction cooker without distortions and tensions during operation to such an extent that the cookware 1 becomes unusable in the longer term.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cookers (AREA)

Claims (15)

  1. Ustensile de cuisson (1), qui comprend un corps de base (2) réalisé en un matériau qui ne convient pas pour les foyers à induction et qui présente un fond (4) dont au moins certaines parties comprennent un élément ferromagnétique d'induction (5),
    caractérisé en ce que
    le fond (4) du corps de base (2) présente au moins une ouverture qui traverse le fond (4) et dans laquelle le ou les éléments ferromagnétiques d'induction (5) sont insérés et
    en ce qu'au moins un élément ferromagnétique d'induction (5) présente sur sa face inférieure au moins un segment d'induction (50) qui est inséré dans une ouverture du fond (4) qui lui est associée.
  2. Ustensile de cuisson selon la revendication 1, caractérisé en ce que l'ustensile de cuisson (1) présente plusieurs éléments ferromagnétiques d'induction (5), chacun des éléments d'induction (5) étant inséré dans une ouverture du fond (4) qui lui est associée.
  3. Ustensile de cuisson selon la revendication 2, caractérisé en ce que les éléments ferromagnétiques d'induction (5) sont disposés concentriquement dans le fond (4) du corps de base (2).
  4. Ustensile de cuisson selon les revendications 2 ou 3, caractérisé en ce que les éléments ferromagnétiques d'induction (5) s'étendent radialement vers l'extérieur depuis le centre du fond (4).
  5. Ustensile de cuisson selon l'une des revendications 1 à 4, caractérisé en ce que l'élément ferromagnétique d'induction (5) présente sur sa face inférieure plusieurs segments d'induction (50) qui sont insérés chacun dans au moins une des ouvertures du fond (4) qui leur est associée.
  6. Ustensile de cuisson selon les revendications 1 ou 5, caractérisé en ce que les segments d'induction (50) s'étendent radialement vers l'intérieur depuis un centre commun.
  7. Ustensile de cuisson selon l'une des revendications 1 à 6, caractérisé en ce que les segments d'induction (50) sont disposés concentriquement sur la face inférieure de l'élément d'induction (5).
  8. Ustensile de cuisson selon l'une des revendications 1 à 7, caractérisé en ce que les segments d'induction (50) sont formés d'un seul tenant avec l'élément d'induction (5).
  9. Ustensile de cuisson selon l'une des revendications 1 à 8, caractérisé en ce que le fond (4) du corps de base (2) présente un creux périphérique (40) sur lequel reposent des parties du ou des éléments d'induction (5).
  10. Ustensile de cuisson selon l'une des revendications 1 à 9, caractérisé en ce que le corps de base (2) est réalisé en un matériau non ferreux, en particulier en aluminium ou en fonte d'aluminium.
  11. Ustensile de cuisson selon l'une des revendications 1 à 9, caractérisé en ce que le corps de base (2) est réalisé en un matériau non métallique, en particulier en matière synthétique, en verre ou en céramique.
  12. Procédé de fabrication d'un ustensile de cuisson, caractérisé par les étapes suivantes ;
    - dans un matériau qui ne convient pas pour les foyers à induction, on forme un corps de base (2) doté d'un fond (4) qui présente au moins une ouverture qui traverse complètement le fond (4),
    - on forme au moins un élément ferromagnétique d'induction (5) de telle sorte que sa taille et sa forme correspondent à la taille et à la forme d'une ou de plusieurs ouvertures du fond (4), au moins un segment d'induction (50) étant disposé sur la face inférieure de l'élément d'induction (5), et
    - on insère le ou les éléments ferromagnétiques d'induction (5) dans la ou les ouvertures.
  13. Procédé selon la revendication 12, caractérisé en ce qu'on réalise une liaison en correspondance de matière entre le ou les éléments d'induction (5) et les parties du fond (4) qui délimitent latéralement la ou les ouvertures.
  14. Procédé selon les revendications 12 ou 13, caractérisé en ce que le ou les éléments d'induction (5) sont enfoncés dans la ou les ouvertures du fond (4).
  15. Procédé selon l'une des revendications 12 à 14, caractérisé en ce que l'on forme un corps de base (2) qui présente plusieurs ouvertures qui traversent le fond (4) et dans chacune desquelles est inséré un élément d'induction (5).
EP05006319A 2005-03-22 2005-03-22 Récipient de cuisson et procédé de fabrication d'un tel récipient de cuisson Not-in-force EP1704937B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT05006319T ATE435079T1 (de) 2005-03-22 2005-03-22 Kochgeschirr und verfahren zur herstellung eines kochgeschirrs
DE502005007613T DE502005007613D1 (de) 2005-03-22 2005-03-22 Kochgeschirr und Verfahren zur Herstellung eines Kochgeschirrs
EP05006319A EP1704937B1 (fr) 2005-03-22 2005-03-22 Récipient de cuisson et procédé de fabrication d'un tel récipient de cuisson

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05006319A EP1704937B1 (fr) 2005-03-22 2005-03-22 Récipient de cuisson et procédé de fabrication d'un tel récipient de cuisson

Publications (2)

Publication Number Publication Date
EP1704937A1 EP1704937A1 (fr) 2006-09-27
EP1704937B1 true EP1704937B1 (fr) 2009-07-01

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ID=34934440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05006319A Not-in-force EP1704937B1 (fr) 2005-03-22 2005-03-22 Récipient de cuisson et procédé de fabrication d'un tel récipient de cuisson

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EP (1) EP1704937B1 (fr)
AT (1) ATE435079T1 (fr)
DE (1) DE502005007613D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVB20100003A1 (it) * 2010-10-26 2011-01-25 Andrea Ottoni Processo di produzione per l'applicazione di piastra o anello in materiale ferromagnetico sul lato del fondo di recipienti per cottura in alluminio o sue leghe.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5647271A (en) * 1992-07-06 1997-07-15 Seb Kitchenware with thermal conducting system
DE9315661U1 (de) * 1993-10-14 1994-02-24 Fa. Alfred Herzog, 58540 Meinerzhagen Kochgeschirr mit einer Aluminiumbodenplatte
DE4421904C2 (de) * 1994-06-24 1998-05-28 Vesta Ag & Co Ohg Topfförmiges Gar- und/oder Kochgerät
FI101260B (fi) * 1995-04-20 1998-05-29 Rondex Oy Ltd Menetelmä metalliosien liittämiseksi toisiinsa
IT1312566B1 (it) * 1999-05-21 2002-04-22 Lagostina Spa Apparecchio di cottura con fondo adatto all'adduzione di energiatermica mediante conduzione ed induzione elettromagnetica.

Also Published As

Publication number Publication date
ATE435079T1 (de) 2009-07-15
EP1704937A1 (fr) 2006-09-27
DE502005007613D1 (de) 2009-08-13

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