EP1062841A2 - A cooktop - Google Patents
A cooktopInfo
- Publication number
- EP1062841A2 EP1062841A2 EP99902514A EP99902514A EP1062841A2 EP 1062841 A2 EP1062841 A2 EP 1062841A2 EP 99902514 A EP99902514 A EP 99902514A EP 99902514 A EP99902514 A EP 99902514A EP 1062841 A2 EP1062841 A2 EP 1062841A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooktop
- coil structures
- wood
- projecting
- induction
- 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
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
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK19398 | 1998-02-10 | ||
DK19398 | 1998-02-10 | ||
PCT/DK1999/000061 WO1999041949A2 (en) | 1998-02-10 | 1999-02-10 | A cooktop |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1062841A2 true EP1062841A2 (en) | 2000-12-27 |
EP1062841B1 EP1062841B1 (en) | 2006-06-21 |
Family
ID=37415644
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99902514A Expired - Lifetime EP1062841B1 (en) | 1998-02-10 | 1999-02-10 | A cooktop |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1062841B1 (en) |
AT (1) | ATE331419T1 (en) |
AU (1) | AU2266099A (en) |
DE (1) | DE69932039T2 (en) |
WO (1) | WO1999041949A2 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH581937A5 (en) * | 1973-05-25 | 1976-11-15 | Sachs Systemtechnik Gmbh | |
DE59400190D1 (en) * | 1994-05-24 | 1996-05-15 | Kolja Kuse | Countertop hob |
-
1999
- 1999-02-10 WO PCT/DK1999/000061 patent/WO1999041949A2/en active IP Right Grant
- 1999-02-10 EP EP99902514A patent/EP1062841B1/en not_active Expired - Lifetime
- 1999-02-10 AU AU22660/99A patent/AU2266099A/en not_active Abandoned
- 1999-02-10 AT AT99902514T patent/ATE331419T1/en not_active IP Right Cessation
- 1999-02-10 DE DE69932039T patent/DE69932039T2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9941949A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO1999041949A2 (en) | 1999-08-19 |
DE69932039D1 (en) | 2006-08-03 |
AU2266099A (en) | 1999-08-30 |
EP1062841B1 (en) | 2006-06-21 |
DE69932039T2 (en) | 2007-01-11 |
ATE331419T1 (en) | 2006-07-15 |
WO1999041949A3 (en) | 1999-10-14 |
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