FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
An induction iron
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai - 400 030, Maharashtra, India, an Indian Company
INVENTORS
Nadkarni Mayur and Kadam Purushottam of Appliances division, Crompton Greaves Ltd, Kanjur Marg (E), Mumbai - 400042, Maharashtra, India, both Indian Nationals
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the manner in which it is to be performed:

FIELD OF THE INVENTION
This invention relates to an induction iron.
BACKGROUND OF THE INVENTION
A conventional iron works on the principle of heat being transmitted to a sole plate through a heating element. A heating element generally consist of metal wires are used to conduct electrical current and transform the electrical current into heat. A nichrome wire, a high resistive wire is embedded magnesium oxide powder which is a good insulator and conductor of heat is used as the heating element. The heating element is press fitted into the sole plate and once current passes through it, it gets heated and the heat is transferred to sole plate through convection. The sole plate is usually made up of iron, stainless steel or aluminum. A conventional iron has a power chord which is attached to it even while the user uses it. It gets difficult to move the iron as the power chord gets sometimes entangled. With the power chord usually of a specific dimension the user is limited by length of the chord and therefore has restricted area on his iron board on which he irons the cloth. The power chord also sometimes gets burnt when it accidentally touches the hot sole plate during the ironing process and this can cause an electrical hazard. The present invention tries to eliminate at least one of the disadvantages as mentioned for a conventional iron.
OBJECTS OF THE INVENTION
An object of the invention is to provide a induction iron which is used to iron clothes.

Several aspects of the invention are described below with reference to examples for illustration. It should be understood that numerous specific details, relationships, and methods are set forth to provide a full understanding of the invention. One skilled in the relevant art, however, will readily recognize that the invention can be practiced without one or more of the specific details, or with other methods, etc. In other instances, well known structures or operations are not shown in detail to avoid obscuring the features of the invention.
DETAILED DESCRIPTION OF THE INVENTION
According to the invention there is provided induction iron for pressing clothes or garments. The induction iron comprises of a moveable unit and a stationary base unit. The moveable unit formed of a ferrous sole plate as a bottom surface and a top plate above defining a sealed enclosure filled up with a heat retention fluid and a handle made out of insulating material secured firmly over the top plate. The stationary unit formed of a glass top and a bottom plate and defines an enclosure that houses a current carrying coil to generate a magnetic flux to cause an inductive heating of the moveable unit placed over the glass top, and a electronic controller to provide alternating current to the current carrying coil and to receive a user input to cause a required inductive heating proportional to the user input by increasing or decreasing the current in the current carrying coil which in turn creates the magnetic field.
The inductive heating in the moveable plate is caused due to 'Eddy currents' generated by the magnetic field in the ferrous sole plate of the moveable unit. As is well known and appreciated by one skilled in the relevant arts, the eddy currents

generates heat in the ferrous sole plate due to 'skin effect'. The 'skin depth' of the sole plate causes an electrical resistance to the eddy currents generated and cause 'I2R' (T indicating the eddy currents and 'R' the electrical resistance of sole plate) losses which result in the heating of the sole plate.
The following is a detailed description of the invention with reference to the accompanying drawing, in which:
Figure 1 is an isometric view of an induction iron composed of a moving unit and a
stationary unit according to the invention.
Figure 2 is an isometric view of the stationary unit of the induction iron according to
the invention
Figure 3 is an exploded view of the stationary unit of the induction iron according to
the invention.
Figure 4 is a internal view of the stationary unit illustrating the manner in which the
temperature sensor of the stationary unit is interfaced with the moveable unit
according to the invention.
Figure 5 is an isometric view of the moveable unit of the induction iron according to
the invention.
Figure 6 is an exploded view of the moveable unit of the induction iron according to
the invention
In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements.

Figure 1 is an isometric view of an induction iron composed of a moving unit 1 and a stationary unit 2 according to the invention. Stationary unit 2 is connected to a power source and has the means to provide an alternating magnetic field. Moving plate 2 is placed over the stationary unit 2. The alternating magnetic field caused by stationary unit 2 causes a induced current in the moving unit 1 which results in the heating of moveable unit 2.
Figure 2 is an isometric view of the stationary unit 2 of the induction iron according to the invention. Figure 2 can be understood better in conjunction with Figure 3 which gives the exploded view of the stationary unit 2 and the internal construction. Figure 3 is shown comprising of a bottom plate 21, main body 22 and a glass top 28 which form a closed enclosure. Bottom plate 21 and main body 22 can be made from ABS plastic or poly propylene. Main board PCB 23 has the related electronic controlling circuitry which regulates the current in. A user can give his input by display cum touch screen 26. The display PCB 25 has the necessary electronics to display the kind of fabric as selected by the user on a display cum touch screen 26 and can also indicate the functioning of the stationary plate 2 and a magnetic filed being currently generated. Wiring 24 connects the display PCB 25 with the display cum touch screen 26. Copper coil 27 forms a current carrying coil which generates the magnetic field. The moving unit 1 of Figure 1 is placed over glass top 28. Glass is an excellent insulator of current and hence is chosen to form the top surface of the stationary unit 2. A temperature sensor 29 is connected to the electronic controller in the main board PCB 25, and is provided a small slot on the glass top 28 and is in touch with the sole plate of moving unit 1 as can be better seen in Figure 4.

Figure 4 is an internal view of the stationary unit illustrating the manner in which the temperature sensor of the stationary unit is interfaced with the moveable unit according to the invention. Sole plate 11 is connected to the temperature sensor 29 through the glass top 28 which is provided a small slot. The temperature sensor 29 is connected to the main board PCB 23 by means or wiring 24.
Figure 5 is an isometric view of the moveable unit 1 of the induction iron according to the invention and can be better understood in conjunction with Figure 6. Figure 6 is an exploded view of the moveable unit of the induction iron according to the invention The moveable unit 1 comprises of sole plate 11 a hollow enclosure 12 which holds a heat retention fluid like glycol, a top plate 13 which seals the enclosure and is provided with a handle 14 made from a heat insulating material which can be used to hold the moving plate when ironing the clothes.
As moveable unit I is placed on the stationary base unit 2, the heat retention fluid as contained in the moveable unit also gets heated up. The hot heat retention fluid helps to retain the heat on the sole plate 11 for a longer duration of time. The moveable unit 1 can be lifted from the stationary base 2 and used to iron or press the clothes.
Different kind of fabrics requires a different temperature grade to erase the creases of an un-pressed cloth. A user input to the electronic controller in stationary base unit, decides the magnitude of alternating current required to produce a magnetic field of appropriate strength to cause the sole plate 11 of the moveable unit 1 to get heated to the required temperature for the cloth to get ironed. A temperature sensor 29 connected to the sole plate 11 provided on the stationary unit 2 can indicate that the

required temperature corresponding to the user chosen input is reached and that the user may remove the moving unit for ironing the clothes. Temperature sensor 29 senses the temperature of the sole plate 11 t & cuts off the power supply to the stationary unit 2 if temperature of the sole plate 11 exceeds from the pre-programmed value as for an user input.
Example -: If user wants to press cotton shirt. He will select the cotton option using touch Screen 26 . The electronic controller of the main board PCB 23 has a pre-programmed value of electric current which needs to flow through the current carrying coil to create a magnetic field which causes the sole unit to get heated to a temperature suitable for ironing of cotton fabrics (for e.g. 200°C) . When sole plate 11 attains the temperature of 200° C, temperature sensor 29 senses the temperature as attained and cuts off the current supply to the copper coil 27. After using the moveable unit with the desired temperature for a while when the user can sense that the temperature of the sole plate 11 has reduced and place it on the stationary unit I to cause a re-heating.

We Claim:
1. A induction iron for pressing clothes or garments, the induction iron
comprising:
a moveable unit formed of
a) a ferrous sole plate as a bottom surface and a top plate above defining a sealed enclosure filled up with a heat retention fluid, and
b) a handle made out of insulating material secured firmly over the top plate, and
a stationary base unit formed of a glass top and a bottom plate defining a space that houses
a) a current carrying coil to generate a magnetic flux to cause an inductive
heating of the moveable unit placed over the glass top, and
b) a electronic controller to provide alternating current to the current
carrying coil and
to receive a user input to cause a required inductive heating proportional to the user input by increasing or decreasing the current in magnetic field, and
c) a temperature sensor and a display device, and
wherein, the moveable unit is magnetically coupled to the stationary base unit when placed over it and allows for inductive heating of the sole plate and the heat retention fluid therein and can be lifted by the handle and used for pressing clothes or garments.
2. A induction iron according to claim 1, wherein the temperature sensor senses
the temperature of the sole plate and indicates a signal on the display device for the
user to lift the moveable unit for pressing clothes or garments.

3. A induction iron according to claim 1 wherein the stationary base unit is powered by the main supply.
4. A induction iron according to claim 1, wherein the heat retention fluid is glycol.