EP0246923A1 - Fers à repasser - Google Patents

Fers à repasser Download PDF

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Publication number
EP0246923A1
EP0246923A1 EP87304597A EP87304597A EP0246923A1 EP 0246923 A1 EP0246923 A1 EP 0246923A1 EP 87304597 A EP87304597 A EP 87304597A EP 87304597 A EP87304597 A EP 87304597A EP 0246923 A1 EP0246923 A1 EP 0246923A1
Authority
EP
European Patent Office
Prior art keywords
coil
soleplate
iron
ironing
reservoir
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP87304597A
Other languages
German (de)
English (en)
Inventor
Laurie Edward Larsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Appliance Control Systems Holdings Pty Ltd
Original Assignee
Appliance Control Systems Holdings Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Appliance Control Systems Holdings Pty Ltd filed Critical Appliance Control Systems Holdings Pty Ltd
Publication of EP0246923A1 publication Critical patent/EP0246923A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F81/00—Ironing boards 
    • D06F81/08—Ironing boards  incorporating heating, steaming, or forced ventilation means

Definitions

  • the present invention relates to cordless irons and to a clothes ironing board incorporating a cordless electrically heated iron.
  • a conventional clothes iron consists of a sole­plate and a handle with the soleplace incorporating a resistive electrical heater. Accordingly, the iron is connected to an electric power supply by means of a cord. Clothes are ironed by means of an ironing board against which the clothes are pressed by the iron.
  • a particular problem which arises with the conventional clothes ironing system is that the hot iron is normally left on the board in an upright, rather than a horizontal, position while clothes are not being ironed and the lengthy cord hangs down below the board. In this position, the cord is able to be pulled by small children who may well succeed in pulling the hot iron on top of themselves.
  • cordless electric iron which incorporates a remote heating unit into which the iron is plugged for resistive heating and reheating.
  • a disadvantage of this known system is that prolonged ironing cannot be undertaken without reheating the iron on many successive ocassions. This necessitates constant replugging of the iron into the remote heating unit.
  • a further problem associated with such known types of cordless irons is that if the iron is provided with a steam generator, steaming causes more rapid loss of stored heat from the soleplate, and therefore exacerbates the replugging problem. In addition, water can also be emitted in drops from the soleplate rather than as steam because the soleplace is not hot enough.
  • a clothes ironing system comprising a substantially flat surface, a coil located adjacent said surface, an R.F. power supply connected to said coil to supply radio frequency electric current thereto, and an iron comprising a soleplate and a handle wherein said soleplate is thermally conductive and includes at least one portion which is electrically conductive whereby said radio frequency current supplied to said coil generates an RF electromagnet field which impinges upon said electrically conductive soleplate portion and inductively heats same.
  • an ironing board for use with a cordless electric iron, said board comprising a substantially flat surface, a coil located adjacent said surface, and and RF power supply connected to said coil to supply radio frequency electric current thereto.
  • a cordless electrically heated iron for use with the above described clothes ironing system, said cordless electric iron comprising a handle and a thermally conductive soleplate at least one portion of which is electrically conductive.
  • the preferred ironing board 1 of the present invention is of a substantially conventional configuration but is preferably made from a thermally insulating material such as fibreglass.
  • a coil 2 which preferably has 25 turns of copper wire having a cross-sectional area of 2.5 sq millimetres.
  • the board 1 is also provided with a number of ventilation holes 3 and a thermal sensor 4 in the form of a thermistor or like known component.
  • Figs. 3 and 4 illustrate the simplest embodiment of a cordless electrically heated iron 6 in accordance with the present invention.
  • the iron is formed from a cast iron soleplace 7 and a plastics handle 8 the preferred approximate dimensions for the soleplate 7 are 10cm x 20cm.
  • the thickness of the soleplate 7 is from 1mm to 3mm, preferably 1.5mm. Thus there is a substantial weight saving compared with conventional irons which have soleplates approximately 5mm thick.
  • Fig. 5 if the coil 2 is energized with alternating current at a radio frequency in the range of 30kHz-100kHz then an alternating magnetic field is setup about the coil 2 as schematically illustrated in Fig. 5. It will be apparent that this magnetic field passes through the soleplate 7 of an iron 6 located on the board 1 and therefore inductively heats the soleplate 7 by the generation of eddy currents. In this way the electrical energy supplied to the coil 2 is effectively transferred to the soleplate 7 via the magnetic field.
  • a transformer T has its primary winding connected to a conventional low frequency mains supply.
  • the output of one secondary winding is passed through a diode bridge and a substantially conventional rectifier circuit comprising intergrated circuit type LM304, a transistor T6, a resistor R7 and two smoothing capacitors C3 and C4.
  • the output of this power supply is 9 volts at a current capacity of approximately 20amps and is connected to one terminal T1 of the coil 2.
  • the other secondary winding of the transformer T is centre tapped and connected to a second diode bridge in order to supply a positive and negative 15 volt supply by means of a capacitors C5 and C6 and intergrated circuits types 7815 and 7915.
  • the positive output of this power supply is connected via normally closed relay 10 to a type 555 timer 11 connected as an RF oscillator.
  • the frequency determing components are resistors R1 and R2 and capacitors C1 and C2 which are selected to provide a square wave output having a frequency of approximately 50kHz.
  • This output is connected to the light emitting diode D4 of an opto-transistor T5 which is accordingly switched on and off at the rate determined by the timer/­oscillator 11.
  • the switching of transistor T5 is transferred via transistors T4 and T3 to a Darlington connection of transistors T1 and T2 which are connected between earth and terminal T2 of the coil 2.
  • the 20 amp current through the coil 2 is switched at the RF rate determined by the timer/oscillator 11.
  • the thermal sensor 4 can be used to switch into the open state the normally closed relay 10 in response to heat detected by the sensor 4 originating from the iron 6. In this way, the power supplied to the ironing board 1 and its coil 2 can be controlled.
  • the thermal sensor 4 is preferably provided with both a thermistor, and a conventional variable resistance in known fashion in order that the power supplied to the coil 2 can be adjusted in accordance with the intended fabrics to be ironed on the ironing board 1.
  • Fig. 7 it is desirable to provide a steam facility with irons and this is provided in accordance with the iron 16 of Fig. 7.
  • the soleplate 17 is provided with a plurality of apertures 19 through which it is intended that steam should issue.
  • a water reservoir 15 which is connected to a steam chamber 14 via a conduit 13 including a valve 12.
  • the valve 12 is operable by means of a push button switch 20.
  • the iron 26 of Fig. 8 includes an inductively heated steam generator.
  • the iron 26 is provided with a soleplate 27 having apertures 29 leading from a steam chamber 24.
  • the iron 26 has a handle 28 provided with a refillable water reservoir 25 formed from material such as plastic which is permeable to magnetic fields.
  • a stream conduit 23 connects the reservoir 25 with the stream chamber 24. It will be apparent that the conduit 23 exits from the side of the reservoir 25 furthest from the heel 30 of the iron 26 so that when the iron 26 is placed in the standby position (as illustrated by iron 60 of Fig. 5) then water does not run from the reservoir 25 to the steam chamber 24 via the conduit 23.
  • a coil 32 Located within the reservoir 25 is a coil 32 which is connected in series with a capacitor 33 via a switch 34.
  • the inductance of the coil 32 and the capacitance of the capacitor 33 are selected so as to form a resonant circuit at the RF frequency at which the coil 2 is supplied with energy.
  • d depth of penetration in meters
  • r resistivity of the material in ohm meters
  • u the absolute permeability of the material
  • w 2 ⁇ f
  • f the frequency.
  • the current at RF frequencies flows in an outer tubular portion of the wire enabling a tube rather than solid wire to be used if desired.
  • the skin depth is inversely proportional to the square root of the frequency and the skin depth of copper at 50Hz is 10mm, it follows that the skin depth of copper at 50kHz is 0.32mm.
  • the inductance of the coil 2 is where L is the inductance u is the permeability a is the cross-sectional area of the coil wire N is the number of turns, and l is the mean length of the magnetic path.
  • L 236 uH which in practice is considerably increased due to the reactance of flux leakage.
  • Z l + j 74.14 (i.e. 74.15 with a lagging phase angle of 89.2°.
  • F 57.6kHz.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Irons (AREA)
EP87304597A 1986-05-22 1987-05-22 Fers à repasser Withdrawn EP0246923A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU604686 1986-05-22
AU6046/86 1986-05-22

Publications (1)

Publication Number Publication Date
EP0246923A1 true EP0246923A1 (fr) 1987-11-25

Family

ID=3696549

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87304597A Withdrawn EP0246923A1 (fr) 1986-05-22 1987-05-22 Fers à repasser

Country Status (1)

Country Link
EP (1) EP0246923A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2392171A (en) * 2002-03-06 2004-02-25 Univ Loughborough Induction ironing system
FR2876119A1 (fr) * 2004-10-04 2006-04-07 Gerard Leroy Fer a repasser a induction
FR2880040A1 (fr) * 2004-12-29 2006-06-30 Laurent Francois Patric Renard Dispositif de fer a repasser a induction magnetique
EP1453360A3 (fr) * 1999-11-03 2006-12-20 Nexicor LLC Système de chauffage par induction et sa méthode de collage adhésif par chauffage inductif
EP1852545A2 (fr) * 2006-05-05 2007-11-07 Lung Wai Choi Appareil à repasser à induction et procédé.
US7681342B2 (en) * 2006-05-05 2010-03-23 Lung Wai Choi Induction ironing apparatus and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2133494A (en) * 1936-10-24 1938-10-18 Harry F Waters Wirelessly energized electrical appliance
US3742174A (en) * 1971-12-29 1973-06-26 Gen Electric Induction cooking appliance including cooking vessel having means for transmission of temperature data by light pulses
US4268737A (en) * 1978-04-11 1981-05-19 Sachs-Systemtechnik Gmbh Cordless inductive flat iron apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2133494A (en) * 1936-10-24 1938-10-18 Harry F Waters Wirelessly energized electrical appliance
US3742174A (en) * 1971-12-29 1973-06-26 Gen Electric Induction cooking appliance including cooking vessel having means for transmission of temperature data by light pulses
US4268737A (en) * 1978-04-11 1981-05-19 Sachs-Systemtechnik Gmbh Cordless inductive flat iron apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1453360A3 (fr) * 1999-11-03 2006-12-20 Nexicor LLC Système de chauffage par induction et sa méthode de collage adhésif par chauffage inductif
GB2392171A (en) * 2002-03-06 2004-02-25 Univ Loughborough Induction ironing system
FR2876119A1 (fr) * 2004-10-04 2006-04-07 Gerard Leroy Fer a repasser a induction
FR2880040A1 (fr) * 2004-12-29 2006-06-30 Laurent Francois Patric Renard Dispositif de fer a repasser a induction magnetique
EP1852545A2 (fr) * 2006-05-05 2007-11-07 Lung Wai Choi Appareil à repasser à induction et procédé.
EP1852545A3 (fr) * 2006-05-05 2009-04-08 Lung Wai Choi Appareil à repasser à induction et procédé.
US7681342B2 (en) * 2006-05-05 2010-03-23 Lung Wai Choi Induction ironing apparatus and method

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Inventor name: LARSEN, LAURIE EDWARD