Automatic heating assembly with selective heating

• US 5,658,478 A
• Filed: 05/03/1994
• Issued: 08/19/1997
• Est. Priority Date: 05/03/1994
• Status: Expired due to Fees

• Current Assignee: Dalibor Satrapa, Hans E. Roeschel
• Original Assignee: Dalibor Satrapa, Hans E. Roeschel
• Inventors: Satrapa, Dalibor, Roeschel, Hans E.
• Primary Examiner(s): Paschall, Mark H.
• Application Number:
  US08/237,273
• Time in Patent Office: 1,204 Days
• Field of Search: 219/502, 219/506, 219/497, 219/494, 219/665, 219/660, 219/661, 219/702, 219/711, 219/518, 219/625, 219/626
• US Class Current: 219/502
• CPC Class Codes: F24C 3/126 on ranges
• CPC Class Codes: H05B 2213/03 Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
• CPC Class Codes: H05B 2213/05 Heating plates with pan detection means
• CPC Class Codes: H05B 3/746 Protection, e.g. overheat cutoff, hot plate indicator

Abstract

An automatic burner assembly is disclosed, which assembly is adapted to be automatically and selectively actuatable upon the placement of a given vessel thereon or in close proximity thereto, this assembly comprising a heating element operably coupled to a sensor assembly, where this assembly is capable of detecting the presence of a given vessel on or proximate to the heating element.

Claims

1. An automatic heating assembly comprising:

one or more heating elements arranged about a planar cooking surface where each element defines an upper and a lower surface, where said heating elements are operatively coupled to a sensor assembly and a power means;

said sensor assembly disposed beneath to said surface so as to be receivable to illumination at a first intensity from a light source disposed above and directed through the cooking surface and over the top surface of said heating elements in a first condition and at a second intensity when an object is placed on one or more of the elements, where said sensor assembly automatically actuates said heating elements when illuminated by light at said second intensity.

3. The assembly of claim 1 further including a light source disposed above said surface such as to illuminate the upper surface of said heating elements.

4. The assembly of claim 1 wherein said sensor assembly is operably coupled to said power means via on/off circuitry such that when said sensor assembly detects a fluctuation in the intensity of the light source the heating elements are automatically actuated.

5. The assembly of claim 1 wherein said sensor assembly includes a light guide and a light sensor where said light sensor is operably coupled to a circuit which in turn is coupled to said power means via a switch, where the signal transmitted by said light sensor to said circuit when in excess of a preset value, closes said switch and thus actuates said heating element.

6. The assembly of claim 1 where the temperature of said elements may be manually modulated.

7. The assembly of claim 1 further including means to deactivate said sensor assembly when light illumination over said surface falls below a preset value.

2. The assembly of claim where said second intensity is less than said first intensity.

8. A selective heating assembly comprising:

a substantially planar heating grid operatively coupled to a surface comprised of a plurality of independently heatable elements, where each such element defines an upper and lower surface, where further said heating grid is operatively coupled to one or more sensor assemblies and a power source;

said sensor assembly disposed beneath to said surface so as to be receivable to illumination at a first intensity from a light source disposed above and directed through said surface and about the top surface of said heatable elements in a first condition and at a second intensity when an object is placed on any given heatable elements, where said sensor assembly is adapted to selectively actuate one or more given elements when said sensor assembly is illuminated by said light at a second intensity.

9. The assembly of claim 8 wherein said sensor assembly is comprised of a light guide and an optical sensor where said assembly is adapted to detect variations in light intensity and translate such variations into an electrical signal.

10. The assembly of claim 9 wherein said sensor assembly comprises one or both of a light filter and a transparent cover.

11. The assembly of claim 8 wherein each said heating element is operably coupled to at least one sensor assembly.

12. The assembly of claim 8 wherein said heating elements allow the passage of selected wavelength light therethrough.

13. The assembly of claim 8 wherein said elements are formed from a group including glass or ceramics.

14. The assembly of claim 8 wherein the heating grid comprises a discrete heating means coupled to each heatable element.

15. The assembly of claim 8 where sensor assembly is operably coupled to a circuit which in turn is operably coupled to said power means via a switch such that the signal translated by said sensor assembly to said circuit when in excess of a selected value closes said switch and thus actuates said heating element.

16. The assembly of claim 8 wherein said light source is projected at less than a 60 degree angle with respect to the plane defined by said surface.

17. An assembly comprising:

one or more heating elements arranged about a substantially planar surface, where said elements are operatively coupled to an actuation assembly and a power means, where said assembly and said power means are operatively coupled via on/off circuitry;

said actuation assembly comprising one or more light sources disposed above the heating surface and adapted to direct a beam of light through said surface and across said elements and one or more sensors below the plane defined by the heating surface receptive to said light beam; and

said circuit adapted to couple said heating elements to said power means when said sensor receives a fluctuation in illumination emitted by one or more light sources.

18. The assembly of claim 17 where said heating elements comprise a natural gas burner, a feed line, a cut-off valve and a generator and flame element, where said generator and flame element is operably coupled to said circuit by a switch operable via a signal from said sensor.

19. The assembly of claim 17 where said heating elements comprise a resistor-type burner which is operably coupled to said power means via a contactor and a switch, where said switch is operable via a signal from said sensor.

20. The assembly of claim 17 where said sensor is comprised of a light guide and an optical receiver, where said receiver can include a photo resistor, photo diode, photo transistor, photothyristor, or video camera.

21. The assembly of claim 20 where said light guide is provided with a transparent cap which may be composed of glass, glass ceramic, ceramic, fused silica or a combination thereof.

22. The assembly of claim 20 where said light guide is operatively coupled with a light filter and the light sensor, where said light filter is adapted to absorb light of selected wavelengths.

23. The assembly of claim 20 where said light guide includes a fiber optic filament.

24. An assembly comprising:

one or more heating elements disposed about a semi-planar heating surface on which may be placed fluid containing vessels;

a power source;

a sensor assembly operably coupled to said heating elements and said power source via a switch where said sensor assembly is capable or translating fluctuations in light from one or more light sources disposed above the heating surface received thereby to engage or disengage said switch so as to actuate one or more heating elements where further said sensor is disposed below the heating surface.

25. The assembly of claim 24 where said sensor assembly includes means to emit a light beam and means to receive and translate reflections of said light beam into an electrical signal.

26. The assembly of claim 24 where said sensor assembly comprises a light guide and an optical sensor.

27. The assembly of claim 24 where said sensor assembly also includes an internal light source.

28. The assembly of claim 24 where said light guide includes a fiber optic filament.

29. The assembly of claim 24 wherein said sensor is receivable to a light source located above said heating elements.