Stoves and furnaces – Heaters – Chemical
Patent
1987-03-23
1988-09-20
Yeung, James C.
Stoves and furnaces
Heaters
Chemical
126246, F24J 102
Patent
active
047717610
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a food tray including a heating device using the exothermic reaction of two reactive products.
Heating foods, culinary preparations, drinks in particular is known using the exothermic reaction for example of quick lime and water. Although the principle is simple, because it is based on a chemical reaction whose equation is known, on the other hand the practical application thereof is much less so. Numerous devices have been provided, but all come up against a few major problems: safety in operation on the one hand and efficiency on the other.
In so far as safety in operation is concerned, the reaction must take place more especially without the risk of burning for the user and the product to be consumed must be isolated sealingly from the reactive products and finally there must be good preservation of this product through insulation, also as tight as possible, from the external medium.
As for the efficiency, all depends on the reaction itself which must be complete, with optimized heat exchanges between the heater and the foods.
The aim of the present invention is to overcome all these problems. It relates more precisely to a food tray equipped with a reliable and efficient independent heater, in which the product to be heated is perfectly protected against any aggression from the reactive products, but on the other hand is in perfect thermal contact with the heat from the exothermic reaction, without it being necessary to use for this heating the steam released during the reaction which, moreover, only occurs for a very short time and proves insufficient.
It also relates to such a tray adapted for sealed closure of the whole which ensures good preservation thereof.
It relates finally to a tray cooperating with an insulating packing (external skirt) which allows the user, without the risk of burning, to handle the tray during and after heating.
The invention relates more precisely to a food tray including a heating device using the exothermic reaction of two reactive products, characterized in that the two parts or volumes (A) and (B) of the tray (1) receiving respectively the heater and the food receptacle are separated by a cover which provides insulation between the two parts (A) and (B) before and during the reaction while cooperating with the bottom of the food receptacle so as to ensure, by contact, the conduction and radiation of the heat from the heater towards the products to be heated contained in said receptacle, this latter having a profile complementary to the inner profile of part (B) of the container and its periphery while itself being closed by a lid isolating the contents of the food receptacle from the outside.
The invention will be better understood from the following explanations and the accompanying Figures in which:
FIG. 1 illustrates schematically the architecture of the different means used in a tray according to the invention,
FIGS. 2 and 3 illustrate the position of the tongue for opening the water pocket, and
FIGS. 4 to 7 show different variants for the sealed external closure of said container.
For the sake of clarity, the same elements bear the same references in all the Figures.
As shown in FIG. 1, a tray 1 includes two parts: the first A containing the heater properly speaking and the second B containing the food receptacle or preserve. According to an important feature of the invention, this tray 1, made for example from polypropylene, includes a shoulder 2 which serves as support point when this tray is inserted in an external packing 3 made for example from polystyrene whose function is to isolate the user thermally from said tray 1 when the heater is operating. To further improve the heat insulation and according to yet another feature of the invention, the inside of tray 1 is lined with an equally insulating material, such as cardboard. This lining 4 is in the form of a box and rests on the bottom of part A. The heater properly speaking is formed by a coated or complexed aluminium container 5. This container has a shoulder 6 on which bear two w
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patent: 3094981 (1963-06-01), Brewer
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patent: 3871357 (1975-03-01), Grosso et al.
patent: 4559921 (1985-12-01), Benmussa
Bourgueil Yves
Doukhan Jacques
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