Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1992-06-01
1994-05-17
Reynolds, Bruce A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
126211, 126220, 126 37A, F24C 1510, F24C 1536
Patent
active
053130499
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a cooking assembly for a cooker or for a cooking top, this assembly being of the type comprising a cooking plate and at least one integrated heat generator enabling a receptacle to be heated without coming directly into contact therewith.
Cooking assemblies have been known for a long time that make use of gas burners, natural gas or LPG, as have the advantages they provide (flexibility, low inertia, adjustments immediately visible), however their drawbacks are also known (presence of a grid in the form of a frame which needs to be cleaned frequently and whose appearance appears to be more and more out-of-date, even as used with a sheet of molded glass on which gas burners are placed, as has been done recently, and as illustrated in U.S. Pat. Nos. 3,592,180 and 3,597,135 for example).
Cooking assemblies have also been known for a long time that use plates with electrical resistances, that do not use any frame-like grid since the receptacles to be heated are placed directly on the hotplates, however their drawbacks are also known (high inertia, adjustments difficult to visualize).
An important change has occurred with the appearance of vitroceramic plates having halogen lamps, since such plates benefit from two considerable advantages, namely ease of cleaning (the surface of the cooking plate is plane over its entire area) and an external appearance that is clearly new, giving a more modern look.
However, such systems still suffer from limited flexibility, and they require sophisticated design to ensure safety. In addition, it remains necessary to ensure that the vitroceramic plate does not rise to a temperature that is too high, thereby requiring safety devices to be present (temperature sensors and temperature limiters) with the drawback of limiting heating power.
Attempts have also been made to renovate gas cookers by using a vitroceramic cooking plate, as illustrated for example in Documents FR-A-2 282 604 and FR-A-2 351 359.
However, the presence of gas burners disposed beneath the plane vitroceramic plate further increases thermal inertia and causes efficiency to be considerably reduced. Under such circumstances, the heat transmitted comes almost solely from radiation: the combustion gases are trapped beneath the vitroceramic plate and must be removed via slots provided at the back of said plate, such that practically no heat is transmitted by convection. The option of transmitting heat by convection is thus almost totally lost, which heat potentially constitutes about two-thirds of the heat energy produced by a gas burner. In addition, it is even more necessary under such circumstances to ensure that the vitroceramic plate is not overheated, thus requiring temperature limiters to be provided between the gas burners and the said plate (it is essential to keep temperature to below about 540.degree. C., thereby also putting a limit on the types of burner that can be used, and in particular preventing direct contact with a naked flame). The confinement of the combustion gases also constitutes a difficulty that is very difficult to overcome, and in any event puts a limit on utilization options: finally, this technique which tends towards an electrical installation does not give rise to performance that is equivalent to that obtained from halogen lamps or induction.
An object of the invention is to design a cooking assembly whose design makes it possible to obtain the main advantages of more recent electrical systems that have a cooking plate, while avoiding the drawbacks of the prior art with respect to inertia and safety.
Another object of the invention is to make it possible, if so desired, to use gas burners, with the advantages specific to gas, and without putting limits on the type of burner used.
Another object of the invention is to design a cooking assembly making it possible to use a vitroceramic cooking plate without running the risk of said plate becoming too hot, and without confining the atmosphere beneath it.
More particularly, the present invention provides a
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Emont Michel
Le Strat Georges
Lefebvre Michel
Logel Bernard
Strasser Robert
Butagaz
Jeffery John A.
Reynolds Bruce A.
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