Multizone laundry iron and method for the thermal regulation of

Details Multizone laundry iron and method for the thermal regulation of Multizone laundry iron and method for the thermal regulation of

1997-05-21

1999-01-26

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219255, 219505, 38 778, H05B 102

Patent

active

058641220

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to the general technical field of appliances conceived for the care of a textile article, such as a clothing article, by subjecting it to the combined action of a thermal treatment, a mechanical pressing treatment and a steam treatment.
The present invention concerns an electric steam iron comprising a hot part composed of a sole and a steam chamber, said hot part of the iron being subdivided into at least two thermal zones, each of them being provided with a heating element and associated with a control organ.


PRIOR ART

In pressing irons of the prior art, the thermal energy transmitted to the pressing sole is conventionally furnished by heating elements such as tubular heating elements, or even by heating elements of the flat type including a resistive strip. In this latter case the resistive strip forms a heating circuit defining on the pressing sole a heating zone, said strip being inserted between two electrically insulating films adhering to one another and also maintaining the resistive strip in place. In one case or the other, it is important to maintain or control the temperature of the pressing sole below an assigned temperature. To this end, it is conventional to use regulation means or temperature sensors, for example a thermostat, disposed in the pressing iron in thermal communication with the heating element. As a general rule the thermostat or any other temperature regulation or control organ is disposed in thermal communication with the heating element in a previously selected zone and often as close as possible to the zone identified as being the hottest at the level of the sole. In effect, it is in order to be careful to avoid or at least limit the conventional problem of exceeding frequently occurring in pressing irons.
Such a phenomenon is produced when the temperature control or regulation organ only records or controls a thermal image of the heating element which is shifted in time and/or in space. This occurs when the thermostat is for example situated in a zone which is too far from the heating element, in such a manner that the thermostat is triggered at the correct assigned temperature but too late, at least a portion of the pressing sole being already at a temperature greater than the assigned temperature. In order to remedy at least in part this conventional phenomenon of thermal disfunctioning, it is consequently well-known to systematically fix the temperature control or regulation organs in the zone of the heating element known to be the hottest.
This solution presents however inconveniences. On the one hand, determination of the hottest zone of a heating element, or even of a pressing iron sole is not always sufficiently precise and can even vary from one appliance to another. On the other hand, the necessity of systematically placing the temperature control organ in the hottest zone of the appliance constitutes an additional fabrication constraint limiting the possibilities of arranging and mounting the other organs of the appliance. This solution is that much more constraining, notably in pressing irons, when the volume available for mounting the different organs necessary for the functioning of the appliance is limited. This constraint thus constitutes a negative factor with regard to the freedom of design and arrangement of the organs in the available volume.
French Patent Application No. 2,691,723 discloses a household appliance particularly a pressing iron in which control of the temperature is improved. For this it comprises a heating element including at least one resistive strip forming a heating circuit delimiting a heating surface, and a temperature control or regulation organ disposed in thermal communication with said heating element, said heating surface comprising at least one local overheating zone opposite which is disposed the temperature control or regulation organ.
Nevertheless, despite the advance provided by such an arrangement and with the objective of offering an operator the best possible utilization c

REFERENCES:
patent: 2345413 (1944-03-01), Morton
patent: 2970394 (1961-02-01), Braumbaugh
patent: 3110975 (1963-11-01), Kircher
patent: 4716276 (1987-12-01), Motegi et al.
patent: 4939342 (1990-07-01), Frens et al.
patent: 5380983 (1995-01-01), Cavada et al.
patent: 5463205 (1995-10-01), Sham et al.

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