Electric heating – Inductive heating – With heat exchange
Patent
1998-08-17
1999-10-26
Leung, Philip H.
Electric heating
Inductive heating
With heat exchange
219624, 219649, 219464, 126211, 126390, 99DIG14, H05B 612
Patent
active
059733039
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the field of kitchen technology for induction stoves, in particular the field of stove top surfaces for induction cooking stoves and starts with the European printed patent document EP 0637898 A1. The present invention thus starts with the state of the art, where a stone plate is employed simultaneously as a work surface top and as a stove surface top for inductive cooking. The surface of stone is selected for the reason that the sturdiness, the ease of care, and in particular the insensitivity against burning food residues into the surface of the stove surface top make it advantageous for employment in the kitchen. For this purpose, the stone plate has to be mechanically stabilized in order to counter a possible crack formation based on the high heat development during cooking. For this purpose, the stone plate is reinforced mechanically by a reinforcement, for example by way of a carbon fiber lamination, which carbon fiber lamination is adhesively glued between two halves of the plate with a heat-resistant compound material in order to prevent crack formation based on tensile stress. The induction coils are then placed into countersunk recesses up to close under the surface of the stone, wherein the underside of the stone surface is again protected at this location with a carbon fiber laminate against crack formation (compare EP 0637898 A1). The expensive production of this arrangement caused by several expensive and time-consuming work steps, as well as caused by the high weight of this massive form of construction can however by now be avoided with the aid of modern stone processing methods based on large-surface cutting of thin stone plates with a water jet.
On the one hand, it is an object of the present invention to introduce this new technology for the arrangement of a light-weight construction of induction stove surfaces made of stone in the kitchen technology, which serves also for the production of conventional kitchen work plates made of stone and which makes possible the production of stone stove surface tops with simultaneous suitability as a kitchen work surface plate in a continuous fashion. On the other hand, the invention assures a clearly improved protection against the cracking of the stone surface upon heat interaction.
This object is accomplished by the features of claim 1. In particular, a uniformly thin-cut stone surface plate is in this case connected over the full face in a planar and continuous way with a reinforcement plate. The large-face alignment in a purely horizontal direction at each location of the reinforcement, solidly adhesively attached to the stone, serves for the optimum tensile stabilization of the stone in order to prevent the crack formation in the stone by heat. The induction coils are applied below, or are integrated into the continuous reinforcement plate.
In addition, an additional torsion stabilization for receiving the pressure on the surface and for the connection to the subconstruction or kitchen cabinet supporting the stove surface top can be produced by a subconstruction in the form of a frame in light-weight construction, for example of wood or of aluminum. The front edge of the surface plate can be reinforced by a trim made of the same or of a different stone material in the thickness, which gives the surface plate the appearance of a massive stone surface plate or granite surface plate. Other materials, for example wood or metal, can also be employed as a trim or border.
The high tensile stability based on the throughout horizontal alignment of the reinforcement is an essential advantage achieved with the present invention, wherein anyway substantially lesser tensile forces occur based on the low thickness of the stone surface plate than is the case in a massive construction form, and this occurs with less weight. This construction form of stove surface tops made of stone assures in addition the flexible movable application of the induction coils below the stone surface, since the surface top exhibits essentially the
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patent: 4221672 (1980-09-01), McWilliams
patent: 4625098 (1986-11-01), Joe
patent: 5043559 (1991-08-01), Scott
patent: 5640947 (1997-06-01), Shute
Kasper Horst M.
Leung Philip H.
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