Stoves and furnaces – Stoves – Cooking
Patent
1992-06-01
1993-11-09
Dority, Carroll S.
Stoves and furnaces
Stoves
Cooking
126 39R, 431328, F24C 300
Patent
active
052593614
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a cooking assembly for a cooker or a cooking top of the type that includes a cooking plate and at least one gas burner that enables a receptacle placed above said gas burner to be heated.
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of a grid in the form of a frame which needs to be cleaned frequently and whose appearance appears to be more and more out-of-date, even as used with a sheet of molded glass in which gas burners are received, as has been done recently, as illustrated in Documents U.S. Pat. No. 3,592,180 and U.S. Pat. No. 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 been provided with the appearance of vitroceramic plates having halogen lamps, since such plates benefit from two considerable advantages, mainly 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 Document FR-A-2 282 604 and in Document FR-A-2 351 359 which refers back to the other.
Such cooking assemblies are then fitted with radiant burners made of perforated ceramic (the ceramic material used has a cellular structure, possibly a honeycomb structure, and/or includes surface craters enabling combustion flames to be kept down in the cells of the ceramic).
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.
Attempts could have been made to mitigate the above-mentioned drawbacks by placing the perforated ceramic radiant burners no longer beneath the vitroceramic plate as applies in both of the above-mentioned documents, but flush with said plate, the plate being provided with holes associated with said radiant burners in order to allow said burners to act directly. However, such a solution is not practical, in reality, since it
REFERENCES:
patent: 3027936 (1962-04-01), Lamp
patent: 3468298 (1969-09-01), Teague et al.
patent: 3592180 (1971-07-01), Kweller
patent: 3597135 (1971-08-01), Kweller
patent: 4569328 (1986-02-01), Shukla et al.
patent: 4597734 (1986-07-01), McCausland et al.
Emont Michel
Lefebvre Michel
LeStrat Georges L.
Logel Bernard
Strasser Robert
Butagaz
Dority Carroll S.
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