EP1062841B1 - Dessus de cuisiniere - Google Patents

Dessus de cuisiniere Download PDF

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Publication number
EP1062841B1
EP1062841B1 EP99902514A EP99902514A EP1062841B1 EP 1062841 B1 EP1062841 B1 EP 1062841B1 EP 99902514 A EP99902514 A EP 99902514A EP 99902514 A EP99902514 A EP 99902514A EP 1062841 B1 EP1062841 B1 EP 1062841B1
Authority
EP
European Patent Office
Prior art keywords
cooktop
wood
coil structures
projecting
grain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99902514A
Other languages
German (de)
English (en)
Other versions
EP1062841A2 (fr
Inventor
Christian Eskildsen
Pelle ÖSTLUND
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.)
Electrolux AB
Original Assignee
Electrolux AB
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 Electrolux AB filed Critical Electrolux AB
Publication of EP1062841A2 publication Critical patent/EP1062841A2/fr
Application granted granted Critical
Publication of EP1062841B1 publication Critical patent/EP1062841B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them

Definitions

  • the invention relates to a cooktop using induction at elevated frequencies for the transfer of energy to cooking vessels placed on said cooktop.
  • the surface may be completelty flat and hence easy to clean, 2) the surface does not become hot due to the primary transfer of energy, 3) the cooking vessel does not need to have a plane bottom surface.
  • the thermal time constant of heating is basically only dependent on the cooking vessel..
  • the top of the projecting coil structures are slightly upwardly curved, the height of crown being in the interval 0.2-1.5 mm. This has the advantage that the support of the thin remaining layer of wood is increased, and the wood may hence be almost veneer-like in character and still retain its strenght.
  • the radius of curvature of the curved top is larger in the plane of the direction of the grain of the wood than across the grain.
  • the top surface of the projecting coil structures thereby become ellipsoidal in character. This embodiment takes into account the difference in flexibility of the veneer along and across the grain.
  • Fig. 1 is shown four induction coil structures 1, 2, 3, and 4 which comprise a core of ferrite or magnetically conducting concrete and a coil, energised by a source of ELF power which is not shown.
  • the induction coil structures are disposed below a protective layer 5 in one piece, although they protrude like low cylinders or truncated cones above the plane of the support 6.
  • the protective layer 5 is thin, as it is completely supported by the coil-and-core structures and the support plane. It does not have to be heat resistant, because the only heating it will experience are losses in the coil and possible conduction of heat from the cooking vessels above.
  • the protective layer may be vacuum molded in a thermoplastic material.
  • Fig. 2 is shown a slab 7 of wood or other natural material or a plastic material. Cavities or recesses 8, 9, 10, and 11 are formed so that the slab may be lowered on top of the support plane with the induction coil structures in such a way that each induction coil structure 1, 2, 3, and 4 is completely enclosed in the cavity, with the top of each coil structure supporting the thin layer 12, 13, 14, and 15 of material remaining after shaping the cavities.
  • the material for the slab only needs to fulfil the conditions of thermal and electrical insulation, and that the strenght of the remaining thin layer is sufficient not to tear when a kitchen utensil slides across it.
  • the top is perfectly flat and may be used as a general kitchen worktable.
  • Fig. 3 is shown an embodiment of the coil structure which ensures that the thin layer 12, 13, 14, and 15 is fully supported. This is obtained by a very small stretching of the thin layer due to a very small curvature of the top of the induction coil structures 1, 2, 3, and 4. Due to the difference in elasticity in the two directions in wood, viz. along and across the grain it has been determined to be advantageous to provide a difference in the radius of curvature in the two directions.
  • the radius of curvature is in practice in the order of 1 to 5 m.
  • the protective layer 5 is a thin sheet of e.g. polyester, the slight curvature is provided in the induction coil, and tightening the sheet transfers this curvature to the top supporting the thin layer 12, 13, 14, and 15.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
  • General Induction Heating (AREA)
  • Magnetic Heads (AREA)

Claims (3)

  1. Dessus de cuisinière utilisant l'induction à fréquences élevées destinée au transfert d'une énergie à des récipients de cuisine placés sur ledit dessus de cuisinière,
    caractérisé en ce qu'il comprend un support (6) destiné à un certain nombre de structures de bobine de chauffage par induction (1, 2, 3, 4) en saillie à partir du support (6) et recouvert par une surface de protection, et un plan en bois ou en autre matériau isolant correspondant (7) comprenant des retraits (8, 9, 10, 11) situés sur le côté inférieur correspondant aux structures de bobine en saillie (1, 2, 3, 4), la mince embase des retraits (12, 13, 14, 15) étant supportée par la structure de bobine en saillie 1, 2, 3, 4).
  2. Dessus de cuisinière selon la revendication 1, en particulier pour une utilisation avec un matériau en bois, caractérisé en ce que le sommet des structures de bobine en saillie (1, 2, 3, 4) est légèrement courbé vers le haut, la hauteur de la couronne se situant dans un intervalle de 0,2 à 1,5 mm.
  3. Dessus de cuisinière selon la revendication 2 fabriqué dans un matériau en bois, caractérisé en ce que le rayon de courbure du sommet courbé est plus grand dans le plan de la direction des veines du bois que dans la direction transversale des veines.
EP99902514A 1998-02-10 1999-02-10 Dessus de cuisiniere Expired - Lifetime EP1062841B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK19398 1998-02-10
DK19398 1998-02-10
PCT/DK1999/000061 WO1999041949A2 (fr) 1998-02-10 1999-02-10 Dessus de cuisiniere

Publications (2)

Publication Number Publication Date
EP1062841A2 EP1062841A2 (fr) 2000-12-27
EP1062841B1 true EP1062841B1 (fr) 2006-06-21

Family

ID=37415644

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99902514A Expired - Lifetime EP1062841B1 (fr) 1998-02-10 1999-02-10 Dessus de cuisiniere

Country Status (5)

Country Link
EP (1) EP1062841B1 (fr)
AT (1) ATE331419T1 (fr)
AU (1) AU2266099A (fr)
DE (1) DE69932039T2 (fr)
WO (1) WO1999041949A2 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH581937A5 (fr) * 1973-05-25 1976-11-15 Sachs Systemtechnik Gmbh
ATE136722T1 (de) * 1994-05-24 1996-04-15 Kolja Kuse Arbeitsplattenkochfeld

Also Published As

Publication number Publication date
AU2266099A (en) 1999-08-30
ATE331419T1 (de) 2006-07-15
DE69932039T2 (de) 2007-01-11
WO1999041949A3 (fr) 1999-10-14
DE69932039D1 (de) 2006-08-03
EP1062841A2 (fr) 2000-12-27
WO1999041949A2 (fr) 1999-08-19

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