WO2005039366A1

WO2005039366A1 - A set of sheets for protection of a surface of an induction-cooking device and the use of sheets

Info

Publication number: WO2005039366A1
Application number: PCT/DK2004/000721
Authority: WO
Inventors: Willy Kjeldsen
Original assignee: Willy Kjeldsen
Priority date: 2003-10-29
Filing date: 2004-10-20
Publication date: 2005-05-06
Also published as: DK200301597A

Abstract

The use of sheets (1) of a thin heat resistant material such as baking foil is disclosed for the protection of an upwardly facing surface (2) of an induction-cooking device by placing the sheet (1) upon said surface (2) prior to the placing of a cooking vessel on the surface on the induction-cooking device, so that the sheet is situated between the cooking vessel and the surface. Furthermore is disclosed a set of such sheets (1, 1’) which set comprises a plurality of sheets of a first selected size and a plurality of sheets of at least one other selected size (1’) deviating from the first selected size (1) so that more heating parts of the surface with different extension may be covered with different sizes of sheets from the same set.

Description

A SET OF SHEETS FOR PROTECTION OF A SURFACE OF AN INDUCTION-COOKING DEVICE AND THE USE OF SHEETS

The present invention relates to the use of sheets of a thin heat resistant material such as baking foil for protection of an upwardly facing surface of an induction-cooking device by placing the sheets upon set surface prior to the placing of a cooking vessel on the surface of the induction-cooking device so that the sheet is situated between the cooking vessel and the surface. The invention furthermore relates to a set of such sheets, which set comprises a plurality of sheets of a first selected size and a plurality of sheets of at least one other selected size deviating from the first selected size, so that more heating parts of the surface of different extension may be covered with different sizes of sheets from the same set.

BACKGROUND Induction-cooking devices, in which one or typically more sources for providing an electromagnetic flux are situated beneath a plane plate with a hard surface arranged so that normally three or four heating circular parts of the surface are formed, are well known today. The advantages of these cooking devices are many the regulation of heat supply is precise and may be adjusted instantaneously, the surface is only heated a little so that the risk of burns is reduced and food remains will not tend to burn and stick to the plate, which because it is plane also easily can be cleaned.

One problem which is also known from the so-called ceramic cooking plates where the heating is facilitated by infrared radiation, is that the hard surface on which the cooking vessels are placed may be receptive to scratches from hard impurities such as salt grains, which are situated between the cooking vessel and the surface. The scratches make it more difficult to uphold a high hygienic standard and when many scratches are present the appearance of the surface is also reduced and may have the consequence that the plate must be replaced. The formation of scratches is today delimited by the hardness of the surface and by having the uses of the cooking devices observing certain precautions such as cleaning the cooking vessels carefully before they are placed on the surface, to refrain from letting the cooking vessels slide on the plate and instead lift them when they are to be moved and furthermore to refrain from adding salt into the cooking vessels when these are placed on the cooking device.

By the term cooking vessel is here understood equipment, which is used for heating of foodstuff on the cooking device such as pots, saucepans, kettles, frying pans, waffle irons, etc.

The purpose of the present invention is to provide assistance for users of induction- cooking devices for reducing the risk of scratching that surface upon which the cooking vessels are placed.

SHORT DESCRIPTION OF THE INVENTION

This purpose is fulfilled with the present invention by the use of a sheet of a thin heat resistant material for the protection of an upwardly facing surface of an induction- cooking device by placing the sheet upon said surface prior to the placing of a cooking vessel on the surface of the induction-cooking device. A direct contact between the cooking vessel and the surface is prevented and thereby are impurities which stick to the bottom of the cooking vessel when it is situated on the surface of the cooking device prevented from coming into contact with the surface and impurities which already are present on said surface will be held between the sheet and the surface and will therefore not scratch the surface when the cooking vessel slides along this or in any other way is moved thereon.

By providing a set of such sheets which comprises a plurality of sheets within two or more different selected sizes it is furthermore achieved to make it simple for a user to protect the different sizes of heating parts or cooking areas of the surface of an induction-cooking device. The present invention relates to the use of a sheet of a thin heat resistant material for the protection of an upwardly facing surface of an induction-cooking device by placing the sheet upon said surface prior to the placing of a cooking vessel on the surface of the induction-cooking device, so that the sheet is situated between the cooking vessel and the surface and covers a heating part of the surface.

The thin heat resistant material is preferably a substantially non-electrically conducting material whereby a current is not generated and runs within the material which would disturb the electromagnetic flux from the heating area and reduce the efficiency of the cooking device.

The thin heat resistant material is preferably of a thickness of from 0.01 mm to 0.5 mm preferably from 0.02 mm to 0.1 mm such as about 0.05 mm. Hereby only a minimal extra air gap is created between the source which generates the electromagnetic flux and the bottom of the cooking vessel whereby the coefficient of efficiency of the induction-cooking device is only affected to an insignificant degree.

The thin heat resistant material is preferably a flexible material and in particularly preferred are the known materials which are normally referred to as baking foil.

The sheet may be cut to a size so that it covers a heating part of the surface, in particular a circular part, and a zone outside this part where this zone preferably extends between 5 mm and 30 mm from the outer periphery of the heating part. The shape of the cut sheet is also preferably circular.

The present invention furthermore relates to a set of sheets of a thin heat resistant material for the protection of an upwardly facing surface of an induction-cooking device which set comprises a plurality of sheets of a first selected size and a plurality of sheets of at least one other selected size deviating from the first selected size. The sizes are preferably selected so that they cover a heating part of the surface, preferably a circular part, and a zone outside of this part where this zone preferably extends between 5 mm and 30 mm from the outer periphery of the heating part. It is preferred that the selected sizes are so that they cover heating parts of the surface with at least one of the diameters of 160 mm, 190 mm and 220 mm which corresponds to standard sizes for cooking areas.

DESCRIPTION OF AN EXAMPLE An example of the present invention is described in the following with reference to the accompanying drawing Fig. 1. On the figure is shown the surface 3 of an induction-cooking device on which surface is shown four heating areas 2 also designated as cooking areas. Under each of the heating areas 2 means are arranged for generating of pulsating electromagnetic flux, which is concentrated within the heating area 2 so that the bottom of a cooking vessel, which is placed upon the area 2 is heated by the flux. The spreading of the flux in the plane of the surface 3 may be controlled by the construction of the surface plate and its delimitation on the surface 3 is shown by the line 4. A sheet 1 of baking foil is provided which is paper of 0.04 mm - 0.006 mm thickness flexible and heat resistant up till about 280 degrees Celsius, which optionally is coated with a slipping coating such as silicone. This material, the baking foil, is itself known for other purposes. The sheet 1 is cut circularly so that it covers the heating area 2 and a zone of approximately 15 mm outside of this, but other shapes than circular may also be applied. Due to its small thickness and because it is not electrically conducting the baking foil substantially does not disturb the magnetic flux or reduces the efficiency degree of the inductive heating.

For the heating areas 2' which have an extension that deviates from the extension of the first heating areas 2, a sheet 1 ' of a different size is provided.

Claims

1. Use of a sheet of a thin heat resistant material for the protection of an upwardly facing surface of an induction-cooking device, characterised in that the sheet is placed upon said surface prior to the placing of a cooking vessel on the surface of the induction-cooking device, so that the sheet is situated between the cooking vessel and the surface and covers a heating part of the surface.

2. Use according to claim 1, where thin heat resistant material is substantially non- electrically conducting.

3. Use according to claim 1 or 2, where the thin heat resistant material has a thickness of from 0.01 mm to 0.5 mm, preferably from 0.02 mm to 0.1 mm.

4. Use according to any of the preceding claims, where the thin heat resistant material is flexible.

5. Use according to any of the preceding claims, where the thin heat resistant material is baking foil.

6. Use according to any of the preceding claims, where the sheet is cut to a size so that it covers a heating part of the surface, preferably a circular part, and a zone outside this part where said zone preferably extends between 5 mm and 30 mm from the outer periphery of the heating part.

7. A set of sheets of a thin heat resistant material for the protection of an upwardly facing surface of an induction-cooking device, which set comprises a plurality of sheets of a first selected size and a plurality of sheets of at least one other selected size deviating from the first selected size.

8. A set of sheets according to claim 7, where each of the sizes is selected so that they cover a heating part of the surface, preferably a circular part, and a zone outside this part, where this zone preferably extends between 5 mm and 30 mm from the outer periphery of the heating part.

9. A set of sheets according to claim 7 or 8, where the selected sizes are so that they cover heating parts of the surface of at least one of the diameters 160 mm, 190 mm and 220 mm.

10. A set of sheets according to any of the claims 7-9 where the thin heat resistant material is substantially non-electrically conducting.

11. A set of sheets according to any of claims 7-10 where the thin heat resistant material is of a thickness of from 0.01 mm to 0.5 mm, preferably from 0.02 mm to 0.1 mm.

12. A set of sheets according to any of the claims 7-11, where the thin heat resistant material is flexible.

13. A set of sheets according to any of the claims 7-12, where the thin heat resistant material is baking foil.