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Electric iron with illumination means. Disclosure Number: IPCOM000009831D
Publication Date: 2002-Sep-20
Document File: 2 page(s) / 79K

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Electric iron with illumination means

It is common known that steam iron applies steam onto the fabric by using heat energy to evaporate water. Normally a tiny pilot lamp, which is arranged electrically in series with the thermostat and in parallel to the heater, is arranged on the top of iron handle, the side of the body or on top of the water tank. The pilot lamp is on when the thermostat is ON, supplying current to the heater and the pilot lamp. It is OFF when the thermostat cut-off the electrical supply to the heater and the pilot lamp. In this manner the pilot lamp indicates to the user whether the iron has been heated to the set temperature, thus is ready for ironing.

In this application, consider a situation where the iron is not in use but is still plugged in with the power switched on, for example, resting on heel during a break in the ironing process, in this state the iron is standby for use. It is noted that the pilot lamp will not be on for most of the time, as the on time is rather brief, especially in iron with high power to weight ratio. This is because the very fast heat up but rather slow cooling of the iron sole coupled with the inherent large switch range (the different between the thermostat On and OFF temperature). However, since the iron is substantially silent, with no other visible indicator, it is difficult for someone else in the household to detect or be aware of the status of the iron, that it is in standby mode and that it is hot.

In another application, the pilot lamp is connected in parallel to the thermostat, which in turn is connected in series with the heater. In this application the pilot lamp indicates that power supply is present or absent. The problem described above is eliminated.  However to indicate the state of thermostat on or off, in order for the user to deduce if the set ironing temperature is reached, the use of another pilot lamp as described above is necessary.

Pilot lamp of the above applications typically consist of a miniature neon lamp with a small lamp cover of less then 6 square centimeters, visible with a limited viewing angle and is typically given the red or amber color. Such lamps are designed for the viewing of the actual user during the ironing process. Though such a lamp can be viewed from a few steps away, the observer must be present within the limited viewing angle of the lamp.

To provide a clear illuminated portion of the iron body that is visible at a large distance with a la...