Cordless inductive flat iron apparatus

• US 4,268,737 A
• Filed: 04/11/1978
• Issued: 05/19/1981
• Est. Priority Date: 04/11/1978
• Status: Expired due to Term

• Current Assignee: Sachs-Systemtechnik GmbH
• Original Assignee: Sachs-Systemtechnik GmbH
• Inventors: Fischer, Wolfgang, Paschakarnis, Peter
• Primary Examiner(s): Reynolds, B. A.
• Assistant Examiner(s): Leung, Philip H.
• Application Number:
  US05/895,515
• Time in Patent Office: 1,134 Days
• Field of Search: 219/10.49, 219/10.57, 219/10.61, 219/10.67, 219/10.75, 219/497, 219/246, 219/10.77, 219/494, 219/10.79
• US Class Current: 219/618
• CPC Class Codes: D06F 81/08 incorporating heating, steaming, or forced ventilation means

Abstract

An apparatus in which a cordless flat iron is energized by a one or more high-frequency oscillators subjacent the normally horizontal work supporting surface of an associated ironing board. The sole plate of the iron consists of a thin layer of conductive material and is electrically and thermally insulated from the handle of the flat iron. The magnetic field of a polarity alternating at high frequency which is generated above the work supporting surface by the oscillator generates eddy currents in the sole plate when the flat iron is placed on the surface or separated from the surface by normally nonconductive textile material to be ironed.

Claims

1. A cordless flat iron apparatus comprising:

(a) a flat iron including a sole plate of conductive material and a handle electrically and thermally insulated from said sole plate;

(b) an ironing board movable into a position to define an approximately horizontal, upwardly directed work supporting surface;

(c) energy transmitting means carried on said ironing board and including oscillator means and a plurality of coils associated with said oscillator means and positioned closely subjacent said surface for generating a magnetic field of a polarity alternating at high frequency above said work supporting surface in said position of the ironing board and for thereby inductively transmitting energy to said sole plate when said flat iron is placed on said surface, said coils being spaced from each other in a direction parallel to said surface, each of said coils being an element of an independent high frequency oscillator;

(d) temperature sensing means for sensing the temperature of said sole plate by said iron;

(e) transmitter means operatively connected to said sensing means providing a wireless signal in response to the sensed temperature;

(f) means for supplying power to said transmitter wherein the output of one of said coils is connected to a rectifier stage, said rectifier stage being coupled to a smoothing stage, said smoothing stage having output terminals for supplying power to said transmitter;

(g) receiver means carried by said ironing board for receiving said signal, and a reference signal generator carried by said board to generate a reference signal;

(h) a comparator circuit connected to said receiver means and to said reference generator for comparing the received signal and said reference signal, and for controlling the output of said oscillator means in response to the relationship between the compared signals; and

(i) an additional surface is also included adjacent to said work supporting surface for depositing said iron, an additional coil being provided subjacent said additional surface, said coil being coupled to one of the high frequency oscillators.

2. The cordless flat iron apparatus as set forth in claim 1, wherein said sole plate includes a flat spiral of sheet metal having a plurality of turns insulated from each other, and conductive means for short-circuiting said spiral.

3. The cordless flat iron apparatus as set forth in claim 2, wherein said conductive means includes a temperature-responsive normally closed switch interrupting the short circuit in said spiral if a predetermined temperature is exceeded.

4. The cordless flat iron apparatus as set forth in claim 1, wherein said oscillator means includes at least one coil, and means for securing said coil to said ironing board in a plurality of respective, alternative positions subjacent to said surface and differently spaced from the same in a transverse direction.

5. The cordless flat iron apparatus as set forth in claim 1, wherein said oscillator means includes power supply means for converting alternating current of less than 100 CPS to high frequency alternating current and at least one coil closely subjacent said surface and connected to said power supply.

6. The cordless flat iron apparatus as set forth in claim 1, wherein said energizing means includes means for producing an alternating current in response to said magnetic field, and rectifying means for rectifying said alternating circuit.

7. The cordless flat iron apparatus as set forth in claim 1, wherein said wireless signal is an infrared signal.

8. The cordless flat iron apparatus as set forth in claim 1, wherein said wireless signal is an ultrasound signal.