WO1999041949A2 - Dessus de cuisiniere - Google Patents

Dessus de cuisiniere Download PDF

Info

Publication number
WO1999041949A2
WO1999041949A2 PCT/DK1999/000061 DK9900061W WO9941949A2 WO 1999041949 A2 WO1999041949 A2 WO 1999041949A2 DK 9900061 W DK9900061 W DK 9900061W WO 9941949 A2 WO9941949 A2 WO 9941949A2
Authority
WO
WIPO (PCT)
Prior art keywords
cooktop
coil structures
wood
projecting
induction
Prior art date
Application number
PCT/DK1999/000061
Other languages
English (en)
Other versions
WO1999041949A3 (fr
Inventor
Christian Eskildsen
Pelle ÖSTLUND
Original Assignee
Aktiebolaget Electrolux
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 Aktiebolaget Electrolux filed Critical Aktiebolaget Electrolux
Priority to DE69932039T priority Critical patent/DE69932039T2/de
Priority to AU22660/99A priority patent/AU2266099A/en
Priority to EP99902514A priority patent/EP1062841B1/fr
Publication of WO1999041949A2 publication Critical patent/WO1999041949A2/fr
Publication of WO1999041949A3 publication Critical patent/WO1999041949A3/fr

Links

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 slab of wood may be chosen to fit in with the remaining wooden structures in the kitchen, and indeed food may be prepared directly on the kitchen table, the wood forming a suitable basis for knives, etc.
  • 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 shows a set of induction coil structures without any cooktop
  • Fig. 2 shows a cooktop with recesses or cavities corresponding to the placement of the induction coil structures from below, and
  • Fig. 3 in exagerration shows the cupola shape of an induction coil according to an embodiment of the invention.
  • 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)

Abstract

Cette invention se rapporte à un dessus de cuisinière remplaçable, qui est conçu pour être utilisé avec le chauffage par induction d'ustensiles de cuisson et que l'on obtient en séparant les structures à serpentins de la surface supérieure de la cuisinière. Cette surface supérieure est constituée par une plaque d'un matériau isolant, par exemple du bois, du marbre ou du plastique, pourvue de cavités sur sa face inférieure qui correspondent exactement aux structures à serpentins faisant saillie depuis la structure mécanique de la cuisinière située en dessous. Ce dessus de cuisinière est parfaitement plat et peut servir de table de travail d'usage général en cuisine.
PCT/DK1999/000061 1998-02-10 1999-02-10 Dessus de cuisiniere WO1999041949A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69932039T DE69932039T2 (de) 1998-02-10 1999-02-10 Kochfeld
AU22660/99A AU2266099A (en) 1998-02-10 1999-02-10 A cooktop
EP99902514A EP1062841B1 (fr) 1998-02-10 1999-02-10 Dessus de cuisiniere

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK0193/98 1998-02-10
DK19398 1998-02-10

Publications (2)

Publication Number Publication Date
WO1999041949A2 true WO1999041949A2 (fr) 1999-08-19
WO1999041949A3 WO1999041949A3 (fr) 1999-10-14

Family

ID=37415644

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1999/000061 WO1999041949A2 (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)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1473582A (en) * 1973-05-25 1977-05-18 Sachs Systemtechnik Gmbh Electrical heating system
EP0637898A1 (fr) * 1994-05-24 1995-02-08 Kolja Kuse Plan de travail et de cuisson

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1473582A (en) * 1973-05-25 1977-05-18 Sachs Systemtechnik Gmbh Electrical heating system
EP0637898A1 (fr) * 1994-05-24 1995-02-08 Kolja Kuse Plan de travail et de cuisson

Also Published As

Publication number Publication date
ATE331419T1 (de) 2006-07-15
DE69932039D1 (de) 2006-08-03
EP1062841A2 (fr) 2000-12-27
WO1999041949A3 (fr) 1999-10-14
DE69932039T2 (de) 2007-01-11
EP1062841B1 (fr) 2006-06-21
AU2266099A (en) 1999-08-30

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