Electric heating – Microwave heating – Field modification
Patent
1998-02-23
1999-12-14
Leung, Philip H.
Electric heating
Microwave heating
Field modification
219763, H05B 678
Patent
active
060021209
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an electric cooking oven comprising a microwave energy source, a waveguide whose outlet opens into a cooking chamber delimited by a rear wall, a top wall, a bottom wall and two side walls and a rotatable device within the cooking chamber, adapted to receive the foodstuffs to be cooked and to be driven in rotation by control means disposed outside the cooking chamber.
BACKGROUND OF THE INVENTION
Such an electric cooking oven permits generally placing, in the cooking chamber, a single dish of a foodstuff. Thus, given the construction of the rotatable device, when a user desires to treat several dishes, either different or the same for several persons, he must successively position the dish within the cooking chamber, program said electric cooking oven and, finally, start the operation of said electric oven. This operation is hence repeated as many times as there are dishes to be treated and requires, because of this, numerous manipulations by the user. On the other hand, in such cooking apparatus, when the foodstuffs to be cooked are disposed in receptacles or packages that are superposed and of dimensions adjacent that of the cooking chamber, these latter prevent good distribution of the microwaves, thereby leading to different treatments of the foodstuffs.
The object of the invention is to overcome these mentioned drawbacks by providing an electric cooking oven permitting treating simultaneously several foodstuffs.
SUMMARY OF THE INVENTION
According to the invention, the rotatable device comprises at least two rotatable plates, namely a lower plate and an upper plate, mounted removably in the cooking chamber, superposed and spaced from each other by a distance d and the outlet of the waveguide is adapted to promote good distribution of the waves over the two plates.
Thanks to an ingenious arrangement of the new rotatable device for reception in the cooking chamber, the manipulation of the dishes in the oven is greatly improved. Moreover, such a new rotatable reception device increases the conventional capacities of electric cooking ovens, namely the possibility of treating simultaneously several dishes, thereby limiting the consumption of electricity and increasing the rapidity of preparation of meals. On the other hand, judicious adaptation of the outlet in the cooking chamber improves, thanks to its correlation with said new rotatable reception device, the distribution of microwave energy in the cooking chamber and as a result each of the foodstuffs to be cooked disposed at different levels in the cooking chamber are subject to optimum microwave radiation permitting obtaining very good treatment of said foodstuff to be cooked.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will become apparent from the description which follows, given by way of non-limiting example, with reference to the accompanying drawings, in which:
FIG. 1 shows, schematically in perspective, a cooking chamber of an electric oven according to the invention, provided with a first rotatable reception device.
FIG. 2 shows schematically in perspective on a reduced scale another embodiment of an electric cooking oven according to the invention, and provided with a second rotatable device;
FIG. 3 is a vertical cross section, on a slightly enlarged scale, on the line I--I of FIG. 2, but in which the rotatable device is only partially represented;
FIGS. 4 and 5 are cross sectional elevational views of the chamber of the oven and of the waveguide according to two possible modified embodiments of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to FIG. 1, the electric cooking oven comprises, among other things, a source of microwave energy 2 such as for example a magnetron, a waveguide 3 whose outlet opens into a cooking chamber delimited by a rear wall 4, a top wall 5, a bottom wall 6, two side walls 7 and 8 and a door (not shown). In the illustrated example, the microwave energy source 2 and the waveguide 3 are fixed on the side wall 8. The cooking
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Leung Philip H.
Moulinex (S.A.)
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