Induction-heated electric hob having support with indicia
First Claim
1. An induction-heated electric hob of the type in which an upper plate serves as a support for a metal cooking utensil, the upper plate being formed of a non-metallic material, below which is situated one or more inductor coils each being a flat coil i the form of a strand of a suitable conductive material in a plurality of flat turns, and having first and second terminals;
- and insulated support plate for the hob positioned between the upper plate and coextensive with it, which has one or more associated cutouts therein in which said one or more inductor coils is supported;
a converter connected to a suitable supply of electrical power and providing to said inductor coil terminals an alternating current of a suitable frequency; and
the improvement which comprisesbetween said support plate and said upper plate, an intermediate complex which is sufficiently opaque to visibly conceal the inductor coil or coils therebeneath, and formed as a continuous sheet coextensive with the upper plate and the support plate suitable to cushion the upper plate from the support plate and the inductor coil or coils and also to prevent liquids from reaching the inductor coil or coils in the event of fracture of the upper plate;
said upper plate being formd of a transparent glass-ceramic material; and
indicia formed beneath the transparent upper plate to indicate the positions of the one or more inductor coils, said indicia being visible through the upper plate yet protected thereby from abrasion from the utensil or from cleaning.
2 Assignments
0 Petitions
Accused Products
Abstract
Induction-heated hob or cookplate has a glass-ceramic transparent top plate, one or more inductor coils below the top plate, and a support plate that has cutout or cutouts in which the inductor coil or coils are situated. The inductor coil or coils is in the form of a spiral or flat winding or a square or rectangular flat winding. A converter receives household power (e.g. 220 v, 60 Hz) and provides an alternating current of suitable frequency (e.g. 25 KHz to 30 KHz) to the inductor coils. Between the support plate and the top plate there is an intermediate complex composed, e.g., of a mica sheet and a glass fabric sheet. Markings or decoration are disposed on the underside of the top plate or on the glass fabric sheet, where they are clearly visible through the transparent top plate, but are not subject to abrasion from cooking utensils or scrubbing. The intermediate complex serves as a cushion or shock absorber for the top plate permitting the latter to be of thinner construction than otherwise, thus reducing the spacing from the inductor coil to the cooking utensil. Also, the intermediate complex also serves as a barrier layer preventing liquids from reaching the inductor coils if the top plate should crack.
50 Citations
10 Claims
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1. An induction-heated electric hob of the type in which an upper plate serves as a support for a metal cooking utensil, the upper plate being formed of a non-metallic material, below which is situated one or more inductor coils each being a flat coil i the form of a strand of a suitable conductive material in a plurality of flat turns, and having first and second terminals;
- and insulated support plate for the hob positioned between the upper plate and coextensive with it, which has one or more associated cutouts therein in which said one or more inductor coils is supported;
a converter connected to a suitable supply of electrical power and providing to said inductor coil terminals an alternating current of a suitable frequency; and
the improvement which comprisesbetween said support plate and said upper plate, an intermediate complex which is sufficiently opaque to visibly conceal the inductor coil or coils therebeneath, and formed as a continuous sheet coextensive with the upper plate and the support plate suitable to cushion the upper plate from the support plate and the inductor coil or coils and also to prevent liquids from reaching the inductor coil or coils in the event of fracture of the upper plate; said upper plate being formd of a transparent glass-ceramic material; and indicia formed beneath the transparent upper plate to indicate the positions of the one or more inductor coils, said indicia being visible through the upper plate yet protected thereby from abrasion from the utensil or from cleaning. - View Dependent Claims (2, 3)
- and insulated support plate for the hob positioned between the upper plate and coextensive with it, which has one or more associated cutouts therein in which said one or more inductor coils is supported;
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4. An induction-heated electric hob of the type in which an upper plate serves as a support for a metal cooking utensil, the upper plate being formed of a non-metallic material;
- below which is situated one or more inductor coils each being a flat coil in the form of a strand of a suitable conductive material in a plurality of flat turns, and having first and second terminals;
below said upper plate, an insulated support plate for the hob substantially coextensive with the upper plate and which has one or more associated cutouts therein in which said one or more inductor coils is supported;
a converter connected to a suitable supply of electrical power and providing to said inductor coil terminals an alternating current of a suitable frequency; and
the improvement which comprises, in between the support plate and the upper plate, a mica sheet covering the support plate and one or more inductor coils, and a layer of small-mesh glass fabric atop said mica sheet and against a lower surface of the upper plate, wherein said upper plate is formed of a transparent ceramic-glass material; and
indicia situated beneath the upper plate and visible therethrough to demark positions of the one or more inductor coils situated beneath the mica sheet. - View Dependent Claims (5, 6, 7, 8, 9, 10)
- below which is situated one or more inductor coils each being a flat coil in the form of a strand of a suitable conductive material in a plurality of flat turns, and having first and second terminals;
Specification