EP1410688A1 - Dispositif de securite de signalisation de temperature elevee, destine a des poeles et appareils associes - Google Patents

Dispositif de securite de signalisation de temperature elevee, destine a des poeles et appareils associes

Info

Publication number
EP1410688A1
EP1410688A1 EP00937995A EP00937995A EP1410688A1 EP 1410688 A1 EP1410688 A1 EP 1410688A1 EP 00937995 A EP00937995 A EP 00937995A EP 00937995 A EP00937995 A EP 00937995A EP 1410688 A1 EP1410688 A1 EP 1410688A1
Authority
EP
European Patent Office
Prior art keywords
glass
smooth
liquid crystal
crystal composition
hot
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Withdrawn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
EP00937995A
Other languages
German (de)
English (en)
Other versions
EP1410688A4 (fr
Inventor
William S. Lerner
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1410688A1 publication Critical patent/EP1410688A1/fr
Publication of EP1410688A4 publication Critical patent/EP1410688A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/12—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance
    • G01K11/16—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials
    • G01K11/165—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in colour, translucency or reflectance of organic materials of organic liquid crystals
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/04—Heating plates with overheat protection means

Definitions

  • This invention relates to safety devices used in cooking and in particular to safety devices that alert someone that the surface of a stove is too hot to touch.
  • Smooth cooktop stoves presently are also dangerous if touched on their top surface when they are still hot, even after use.
  • These smooth cooktop stoves, or “smoothtops" as they are sometimes called, utilize as the heating element separate areas on the top surface of the stove (at the same location that gas stove would have burners) which are made of glass.
  • a strong light source such as a halogen lights.
  • the light source projects the light upward to the surface area of the smoothtop ' s heating element - the glass area on the top surface of the stove. Since the glass area is coated on its bottom with a dark coating, when the light strikes it, the heat from the strong light is absorbed by the glass area and these glass surfaces form each heating element of the stove.
  • the smooth cooktop is the use of a "ribbon heating element" where the smooth glass surface is heated by a coiled electric circuit called a "ribbon element” just underneath it instead of by a halogen light source. The heat is transmitted directly upward so that only the heat element itself gets hot and the rest of the cooktop surface remains cool.
  • the ribbon heating element also has another feature whereby the heating element is made of two concentric circles so that the option exists of two sizes of the heating element to match the two different sizes of the pans that need to be heated. This new technology does not solve the problem of warning adults and children that the heating element should not be touched when the cooking process has ended. If anything, it generates the additional hazard that someone can be lulled into touching the heating element after thinking the heating element is cool since the surface right adjacent to it is indeed cool.
  • toaster ovens because of its mobility the danger of touching the window of a toaster oven exceeds that of the typical immobile oven.
  • the toaster oven can be placed on a counter top or other portion of the kitchen not directly in the "cooking center". Consequently, an adult and especially a child, or the elderly, is not likely to remember not to touch a window of a toaster oven when it is off (soon after it had been on) .
  • the door of a toaster oven can be left open and jut out further toward someone in the kitchen.
  • U.S. Patent No. 3,827,301 to Parker discloses an apparatus for indicating the temperature of a surface of an appliance. It has a first portion in contact ,with the appliance surface or connected by copper wires or heat pipes to the appliance surface. It has a second portion, a poor heat conducting member in heat exchanging relationship to the ambient environment, that has bands of liquid crystal material extending away from the first portion thereby creating a temperature gradient extending away from the surface of the appliance.
  • liquid crystal compositions that change color and remain at that color when they reach or exceed a certain temperature
  • liquid crystal compositions such as cholesteric liquid crystals or various types of liquid crystal polymers designed to turn color when they reach a certain temperature, and that are shaped in the outline of the word "HOT"
  • the device is an improved electric coil whose central area contains the liquid crystals.
  • the liquid crystal display is embedded in the glass areas that form the heating elements of the smooth cooktop stove.
  • the liquid crystal display is in the shape of a ring surrounding the heating element (and visible when pots are placed on the heating element) which ring may have an interrupted area in the outline of the letters "HOT").
  • the liquid crystals are embedded in a recessed disk mounted on top of the central element of the gas stove's burner.
  • the liquid crystals stay red as long as the temperature they sense exceeds a certain degree Fahrenheit, such as 115 degrees Fahrenheit, which has been found to be too hot to touch.
  • the liquid crystal display is embedded in the glass areas that form the heating elements of the smooth cooktop stove.
  • FIG. 1 is a top plan view of a gas stove having the device of the present invention on each burner.
  • FIG. 2 is an enlarged fragmentary plan view of a heating element of a gas stove having the device of the present invention.
  • FIG. 3 is an enlarged fragmentary cross-sectional view taken along line 3—3 of FIG. 2.
  • FIG. 4 is the prior art smooth cook top stove showing light indicators.
  • FIG. 5 is a top plan view of the device of the present invention used on an electric stove.
  • FIG. 6 is an enlarged fragmentary plan view of one heating element of an electric stove having the device of the present invention.
  • FIG. 7 is an enlarged fragmentary cross-sectional view taken along line 7—7 of FIG. 6.
  • FIG. 8 is a top plan view of the device of the present invention on the smooth surface of a cook top stove.
  • FIG. 9 is an enlarged fragmentary plan view of one heating element of a smooth cook top stove having the device of the present invention.
  • FIG. 9A is an enlarged fragmentary plan view of one heating element of a smooth cook top stove and having the device of the present invention in the shape of a ring surrounding the heating element.
  • FIG. 10 is a enlarged fragmentary cross-sectional view taken along line 10—10 of FIG. 9.
  • FIG. 10A is a enlarged fragmentary cross-sectional view taken along line 10A—10A of FIG. 9A.
  • FIG. 11 is a front elevational view of a wall stove having the device of the present invention.
  • FIG. 12 is an enlarged fragmentary front elevational view of one heating element of a smooth cook top stove having the device of the present invention.
  • FIG. 13 is a enlarged fragmentary cross-sectional view taken along line 13—13 of FIG. 12.
  • FIG. 14 is a front elevational view of a wall oven having the device of the present invention.
  • FIGS. 1-3 One of the embodiments of the present invention is for stoves that employ gas heat, as seen in FIGS. 1-3.
  • the top of the stove 100 typically has four heating elements 7 , that are called burners and that are covered by metal grates 9, that are open in the middle.
  • Each burner or heating element is situated in a recessed area 8 and is surrounded by the metal grate.
  • FIG. 2 there is a central metal element 10 in which a series of gas inlet holes on the side 10a of the central metal element permit gas to flow through and ignite.
  • the central metal element 10 has a disk 12 on a top surface 12a of the central metal element 10 and this disk 12 contains liquid crystals 14 in the form of the letters "HOT" that change color when they reach a certain temperature.
  • the central metal element 10 itself can have embedded therein on its top surface the liquid crystals 14 in the shape of the letters "HOT” using known methods.
  • the temperature of the grates upon which pots and pans rest during cooking may be roughly equal to the temperature of the central metal element 10. Accordingly, whenever the letters "HOT" become red both the grates and the central metal element may be too hot to touch. However, there may be some discrepancy between the temperature of the grates and that of the central metal element 10.
  • the turning temperature as an option, the temperature at which the liquid crystal compositions 14 (such as cholesteric liquid crystals or various types of liquid crystal polymers designed to turn red at a specific temperature) turn red, can be calibrated by lowering the turning temperature by an estimate of the amount of this discrepancy so that if either the grates or the central metal element 10 is too hot the liquid crystals 14 will remain red.
  • the liquid crystal compositions 14 such as cholesteric liquid crystals or various types of liquid crystal polymers designed to turn red at a specific temperature
  • FIGS. 5-7 depict an embodiment of the present invention for the top surface of electric stoves.
  • Electric stoves typically have four heating elements on the top of the stove made of electric coils 20 wound in a serpentine configuration and sitting on a metal rest 21.
  • electric coils 20 have a recessed disk 22 in a central area of each coil 20 that is connected to and held up by the metal rest 21.
  • FIGS. 5 shows top plan view and FIG. 6 shows an enlarged fragmentary plan view of electric coil 20 of the present invention having central disk 22 containing liquid crystal compositions 24 (which may be cholesteric liquid crystals or various types of liquid crystal polymers designed to turn color at a specific temperature) that are in the shape of the letters "HOT" embedded on the top surface 22a thereof.
  • liquid crystal compositions 24 which may be cholesteric liquid crystals or various types of liquid crystal polymers designed to turn color at a specific temperature
  • the liquid crystals 24 become red whenever the temperature of central disk 22 exceeds 115 degrees Fahrenheit and remains red unless and until this temperature is crossed again.
  • This electric coil 20 may be made by embedding the liquid crystals 24 on the top surface 22a of the central disk 22 using methods well known in the art. Alternatively, existing electric coils can be modified by fitting thereon a disk containing on its top surface liquid crystals 24 embedded therein.
  • the central disk 22 containing liquid crystals 24 in the shape of the letters "HOT" embedded on the top surface 22a is recessed roughly a quarter of an inch below the surface of the electric coil 20 so that when pans and pots are placed on the electric coils they do not scratch the central disk 22.
  • FIGS. 8-10 depict an embodiment of the present invention for use with smooth cooktop stoves, sometimes called “smoothtops” or "cooktops".
  • smooth cooktop stoves have heating elements that consist essentially of an area of glass surface 30 that is smooth on top and whose underside is made dark enough to absorb light.
  • each area 30 Underneath each area 30, usually circular, is a strong light source 36, such as a halogen lights.
  • the light source 36 projects the light upward to the surface area of the smoothtop's heating element - the glass area 30 on the top surface of the stove. Since each glass area is coated on its bottom with a dark coating, when the light strikes it, the heat from the strong light is absorbed by the darkened portion of the smooth area of glass 30.
  • These glass surfaces 30 form the heating elements of the stove. For cooking, cooking utensils are simply placed over the area (which may be square, round, etc.) of the heating element on the glass surface.
  • Some smooth cooktop stoves employ "radiant" heat sources for the glass areas instead of halogen light sources 36 but the effect is the same.
  • some smooth cooktop stoves have halogen lamps (under each area 30 as before) but they emit infrared waves that provide light and heat.
  • the heat alert device of the present invention when used for the smooth surface of cooktop stoves of either type would comprise liquid crystal composition 32 embedded in the top surface of each glass area 30, which is the heating element on the smooth cooktop stove using known methods.
  • the liquid crystal composition 32 may be made in the exact shape of the letters "HOT” by spraying the composition of liquid crystals 32 over each glass area 30 after covering the glass area 30 with a cardboard stencil or other cut-out in the outline or shape of the letters "HOT".
  • the liquid crystal composition is designed to turn red and remain red whenever the temperature of the smooth area of glass exceeds a specified temperature, such as 115 degrees Fahrenheit.
  • the liquid crystal display is in the shape of a ring surrounding the heating element (and visible when pots are placed on the heating element) which ring may have an interrupted area in the outline of the letters "HOT", as seen in FIGS. 9A and 10A.
  • the liquid crystal composition 32 is embedded on the stove surface in the outline of a ring (and in the letters "HOT") in a location of surrounding the heating element, i.e. surrounding the top surface of the smooth glass or metal areas 30 on the stove surface 31.
  • FIGS. 8-10 (including FIGS. 9A, 10A) have been described in terms of smoothtops with heating elements made of smooth glass surfaces, other variations of smooth top stoves exist - in particular smooth metal tops called electric cooktops. The difference is that a light source 36 would not be used under the surface to generate heat - instead the metal gets hot by being connected to a heat source that may be electric (not shown) .
  • some smooth cooktops use a "ribbon heating element" instead of halogen light sources where the smooth glass surface is heated by a coiled electric circuit called a "ribbon element" directly and immediately underneath the glass instead of by a halogen light source.
  • FIGS. 8-9 which depicts the present invention for use with glass cooktops also depicts the present invention as applied to smooth metal cooktop stoves and as applied to ribbon heating elements.
  • FIG. 10 which describes the present invention for use with glass cooktops that employ halogen light sources, the top part of FIG. 10 also depicts a cross section of the liquid crystal composition for smoothtops - for metal cooktops and glass cooktops using ribbon heating elements the halogen light source 36 would not be present but everything else would be the same.
  • the liquid crystal composition 32 would still be embedded in the top surface of the smooth metal areas 30 on the stove surface in the shape of the letters "HOT".
  • FIGS. 11-13 depict a wall oven whose window surface 40 has embedded thereon the liquid crystal composition 46 of the present invention in the shape of the letters "HOT".
  • the liquid crystal composition 46 is designed to turn red and remain red whenever the temperature of the smooth area of glass exceeds a specified temperature, such as 115 degrees Fahrenheit. The purpose is to warn children or adults not to touch the surface of the window 40 that gets very hot when the oven is on. There is not present a convenient and effective warning method in use for the vertical surfaces of oven windows. This is particularly important since when the oven is turned off, the window 40 remains hot even though it appears that everything is off.
  • Toaster ovens also have a window surface 40 which would have embedded thereon the liquid crystal composition 46 of the present invention in the shape of the letters "HOT".
  • the liquid crystal composition 46 is designed to turn red and remain red whenever the temperature of the smooth area of glass exceeds a specified temperature, such as 115 degrees Fahrenheit.
  • Hot plates can be thought of as small mobile electric stoves having one heating element.
  • Warming trays can be thought of as small mobile smooth cooktop ovens having one smooth surface as a heating element.
  • the hot plate and the warming tray the present invention would be applied to the heating element and function the same way as described with respect to their larger and more permanent counterparts - the electric stove and the cooktop stove.
  • the present invention makes use of any liquid crystal composition that changes color and remains at that color when a specified temperature is reached or exceeded - it need not necessarily be cholesteric, although it has been found that cholesteric liquid crystals do this effectively. It is also within the scope of the present invention to make use of a liquid crystal composition that changed color when it reached a specified temperature or temperature range but changed to a third color at a higher threshold temperature, so long as the third color is significantly different from the first color - although this would certainly not be the ideal kind of liquid crystal composition. The ideal composition turns red at a specified temperature and remains red above that temperature.
  • the present invention contemplates that other letters and other letter shapes besides that of "HOT” could be used as a warning although it is believed that the simple arrangement of the letters "HOT” in the simplest typeset provide the best warning.
  • the present invention also contemplates that the liquid crystal composition in the outline of the letters "HOT” can be embedded in a surface of a stove, toaster oven or other appliance where the surface is vertical and perpendicular to the floor, not only horizontal.
  • the drawings depict the liquid crystal composition embedded on the surface of the stove in a particular configuration and depth, it is contemplated by the present invention that the depth and configuration of the liquid crystal composition can vary and still be within the scope of this invention.
  • glass disks containing liquid crystal compositions in the shape of the letters "HOT" can be made so as to be purchased separately by the consumer as a glass disk having embedded therein the liquid crystal composition to be affixed to a glass surface area of a cooktop stove, a wall oven or a toaster oven.

Abstract

Selon la présente invention, des compositions de cristaux liquides (24) telle que des cristaux liquides cholestériques, conçus pour prendre la couleur rouge à une température spécifiée et au-dessus de cette température, et pour garder cette couleur rouge à cette température et au-dessus de cette température, et formant les contours du mot 'HOT' (chaud), sont noyés dans la surface de l'élément chauffant (20) de poêles ou dans la surface vitrifiée de fours encastrés, de sorte qu'ils prennent la couleur rouge et avertissent instantanément toute personne que l'élément chauffant du poêle ou la vitre se trouve à une température trop élevée pour être touchée. Dans les poêles électriques, les cristaux liquides sont contenus dans la zone en retrait de la bobine électrique. Dans les poêles à surface de cuisson lisse, l'affichage de cristaux liquides est noyé dans une surface supérieure de la partie lisse du verre (30) qui forme l'élément chauffant du poêle. Dans les poêles à gaz, les cristaux liquides sont noyés dans un disque monté sur la surface supérieure de l'élément métallique central (10) de l'élément chauffant.
EP00937995A 2000-05-31 2000-05-31 Dispositif de securite de signalisation de temperature elevee, destine a des poeles et appareils associes Withdrawn EP1410688A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/014990 WO2001093640A1 (fr) 2000-05-31 2000-05-31 Dispositif de securite de signalisation de temperature elevee, destine a des poeles et appareils associes

Publications (2)

Publication Number Publication Date
EP1410688A1 true EP1410688A1 (fr) 2004-04-21
EP1410688A4 EP1410688A4 (fr) 2004-06-16

Family

ID=21741444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00937995A Withdrawn EP1410688A4 (fr) 2000-05-31 2000-05-31 Dispositif de securite de signalisation de temperature elevee, destine a des poeles et appareils associes

Country Status (3)

Country Link
EP (1) EP1410688A4 (fr)
AU (1) AU2000253098A1 (fr)
WO (1) WO2001093640A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7554060B2 (en) 2006-09-29 2009-06-30 England Raymond O Displaying cooking-related information
DE102010002882A1 (de) 2010-03-15 2011-09-15 BSH Bosch und Siemens Hausgeräte GmbH Glaskeramik-Kochfeld

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0603969A1 (fr) * 1992-12-22 1994-06-29 Laboratoires D'electronique Philips S.A.S. Appareil à effet thermique muni d'un indicateur de température
US5499597A (en) * 1994-11-01 1996-03-19 Kronberg; James W. Optical temperature indicator using thermochromic semiconductors

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870316A (en) * 1956-05-18 1959-01-20 Philco Corp Heaters
US3384736A (en) * 1966-04-29 1968-05-21 Gen Electric Surface heating device
US3384735A (en) * 1966-04-29 1968-05-21 Gen Electric Surface heating device
GB8709051D0 (en) * 1987-04-15 1987-05-20 Emi Plc Thorn Thermochromic temperature sensor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0603969A1 (fr) * 1992-12-22 1994-06-29 Laboratoires D'electronique Philips S.A.S. Appareil à effet thermique muni d'un indicateur de température
US5499597A (en) * 1994-11-01 1996-03-19 Kronberg; James W. Optical temperature indicator using thermochromic semiconductors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO0193640A1 *

Also Published As

Publication number Publication date
AU2000253098A1 (en) 2001-12-11
EP1410688A4 (fr) 2004-06-16
WO2001093640A1 (fr) 2001-12-06

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