Textiles: fluid treating apparatus – Machines – Combined
Patent
1995-08-04
1996-10-08
Coe, Philip R.
Textiles: fluid treating apparatus
Machines
Combined
34 86, 68 20, 68207, 134105, D06F 3904, D06F 3908, A47L 1542
Patent
active
055619924
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to the field of electric domestic appliances used for washing and/or drying dishes or laundry.
BACKGROUND OF THE INVENTION
With the above-mentioned appliances, various washing and/or drying cycles are carried out which are controlled by a programmer and which must almost always use water or air heated to a predetermined temperature.
Because the thermal energy produced by means of electric resistances has proved substantially more expensive than that produced by means of the burner of a central heating system, there are various appliances in the prior art which, for the washing operation, draw water from the central hot-water system and mix it by means of a mixer with a required quantity of cold water before introducing it into the appliance, generally at the bottom of same, so that the different types of cycle can be carried out. The programmer controls the operation of the mixer so as to arrive at the temperatures indicated for the various cycles.
However nowadays this type of operation has various disadvantages.
The first of these is that the water, once introduced into the electric domestic appliance, gradually cools on contact with the appliance and the articles to be washed or dried, and therefore, in order to be efficient, the cycle must have a duration relative to the average temperature which the water will have during said cycle, for which reason such duration will be appreciably greater than that which would be required for a cycle during which the water maintained a constant temperature.
SUMMARY OF THE INVENTION
The second disadvantage is due to the fact that, in the majority of prewash cycles, for example in washing-machines, where such an operation takes place at a temperature of approx. 40.degree. C., the water, coming into contact with the incrustations of dirt on the fabrics at that temperature, confer to the dirt itself a resistance against removal which is greater than that which this would have if the prewash were carried out at a lower temperature. Therefore an appliance would be beneficial which could start the prewash at a low temperature, and could then increase the temperature of the water gradually as required, for example up to about the 40.degree. C. mentioned above.
In addition, washing-machines known as washer/dryers in particular are not able to dry all the laundry which they can hold for washing. This operation is therefore usually best carried out by means of a further appliance designed exclusively for this purpose which uses the heat produced by resistors incorporated inside elements of suitable design.
The best result would involve a washing-machine which could change the temperature of the water during its various cycles without resorting to expensive electrical energy and which could also proceed to dry all the washed laundry without this having to be removed either in total or in part from the appliance, or a dryer which could dry the laundry without resorting to heat produced electrically. In the case of dish-washers, the problems are similar and it would be convenient not to have to resort to the use of electrical energy either for heating the water or for drying the dishes.
One solution of these problems has been proposed by the inventor by means of the object of this application, namely an electric domestic appliance corresponding to the state of the art described in the preamble of the attached claim 1, but characterized in accordance with the characterizing section of said claim 1.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment according to the invention is now described in more detail, reference also being made to the attached drawings in which:
FIG. 1 shows a perspective schematic view, seeing through a washing-machine according to the invention;
FIG. 2 shows a diagram of a possible arrangement of the coils which is effective both for washing-machines and for dish-washers and dryers.
DETAILED DESCRIPTION OF THE DEVICE
With reference to FIG. 1, in an electric domestic appliance according to the
REFERENCES:
patent: 3406413 (1968-10-01), Ridley
patent: 4376378 (1983-03-01), Svenningsen
patent: 4514914 (1985-05-01), Kitzmiller
patent: 4727733 (1988-03-01), Huber
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