US3567906A - Planar surface heater with integral fasteners for heating element - Google Patents

Planar surface heater with integral fasteners for heating element Download PDF

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US3567906A
US3567906A US815649A US3567906DA US3567906A US 3567906 A US3567906 A US 3567906A US 815649 A US815649 A US 815649A US 3567906D A US3567906D A US 3567906DA US 3567906 A US3567906 A US 3567906A
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heating element
insulating board
glass
panel
plate
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Bohdan Hurko
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General Electric Co
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General Electric Co
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    • 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
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater

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  • a heated cooktop having a top glass-ceramic plate with one or more electrical resistance heating units adjacent the underside thereof to form one or more heated areas of the plate upon which a cooking utensil could be positioned for heating or cooking purposes.
  • a heating unit has a base plate upon which are supported a first lower layer of resilient insulation material, a second layer of semirigid insulating board, and a closely wound, sinuous, electrical resistance heating wire of flattened cross section, where the resistance wire is provided on its underside with fastening spikes that are embedded in the top of the insulating board.
  • the top of the resistance wire is in heat transfer relationship with the glassceramic plate.
  • the top plate is seated on a supporting surface independently of the heating units.
  • One embodiment incorporates a strip of elastic material under the peripheral edge of the top plate and in contact with the supporting surface to prevent direct contact between the top plate and supporting surface, while sealing the joint therebetween from the accumulation of liquids and soil.
  • a standard electric cooktop is usually provided with a plurality of metal sheathed electrical resistance heating elements which are each wound in the form of a coil and positioned in an opening formed in the cooktop. Each heating element is adapted to support a cooking utensil thereon. These metal sheathed heating elements are self-cleaning of food soil due to the high temperatures they are allowed to reach once they are energized, but it is possible for spillovers to drain through the heating element and accumulate in a collecting pan located beneath the cooktop.
  • cooktops or solid plate surface units have been proposed in which the exposed surface is formed of a glass-ceramic panel.
  • a generally milk-white, opaque glass-ceramic material has been suggested for this use. Examples of such material are the crystalline glass sold under the trademarks Pyroceram, Cer-Vit, and Hercuvit.
  • Pyroceram, Cer-Vit, and Hercuvit are the crystalline glass sold under the trademarks Pyroceram, Cer-Vit, and Hercuvit.
  • the opaque crystalline glass because of its smooth surface, not only presents a pleasing appearance but it is also readily cleanable.
  • There has been a problem, however, in these glass-ceramic heating units in obtaining satisfactory heating rates as compared with those available from the traditional, exposed, metal sheathed electrical resistance heating units.
  • An object of the present invention is to provide an improved solid plate surface heating unit which is pleasing in appearance, efficient in operation'and competitive with the operation of present day metal sheathed electrical resistance heating elements, as well as resistant to mechanical impact and serviceable over a long period of time.
  • a further object of the present invention is to provide a solid plate surface heating unit of the class described where the plate is of crystalline glass and the source of heat is a sinuous, flattened, electrical resistance wire with special means for fastening the wire to an insulating base.
  • a further object of the present invention is to provide a solid plate surface heating unit of the class described with a moisture proof resilient sealing means around the periphery of the plate that serves as a shock absorbing support means therefor.
  • a further object of the present invention is to provide a solid plate surface unit of the class described where the source of heat energy is supported on a'resilient insulating medium which serves to hold the heat source in form contact with the underside of the plate for good thermal conductivity.
  • a further object of the present invention is to provide a solid plate surface unit of the class described with insulating means for supporting the plate from a cooktop surface.
  • the present invention in accordance with one form thereof, relates to a solid plate surface heating unit comprising a crystalline glass plate supported at its periphery by a sealing medium. Beneath the plate is a closely wound, sinuous, electrical resistance wire flattened in cross section, and in strip form. There are means for fastening the resistance wire to an insulating base whereby the crystalline plate is protected against mechanical impacts.
  • the glass also has generally uniform temperature gradients due to a large contact surface area relationship between the heating means and the plate.
  • FIG. 1 is a top plan view of an electric cooktop embodying the present invention where the cooktop has a single solid glass plate with a series of four heated surface units and a related control panel.
  • FIG. 2 is an enlarged fragmentary plan view of a single solid plate surface unit with the crystalline glass plate removed to show the closely wound, sinuous, flattened electrical resistance wire in strip form that is supported on layers of insulating material of generally circular form. It will be understood that the heating element would ordinarily not be visible through the opaque glass.
  • FIG. 3 is a fragmentary cross-sectional elevational view on a slightly larger scale of the solid plate surface heating element taken on the line 3-3 of FIG. 2 and showing the supporting base plate for the surface heating element as well as two layers of insulating medium which carry the resistance wire on the top thereof and press the wire into good thermal contact with the underside of the crystalline plate. Particular attention is directed to the presence of staples fastened to the underside of the resistance wire and embedded in the top layer of the semirigid insulating medium to hold the wire in place.
  • FIG. 4 is a fragmentary detailed view of the staple method of joining the adjacent ends of two strips of the resistance wire.
  • FIG. 5 is a second modification of the present invention wherein the closely would sinuous .flattened electrical resistance heating wire is wound in a spiral coil somewhat resembling the configuration of a metal sheathed resistance heating element.
  • FIG. 6 is a fragmentary cross-sectional elevational view 'of a third modification of the present invention showing a ceramic layer formed on the underside of the glass plate where the ceramic layer has a high electrical resistivity.
  • FIG. 7 is a fragmentary cross-sectional elevational view similar to that of FIG. 6 of a fourth modification of the present invention where the heating wire is shown spaced away from the underside of the glass plate.
  • FIG. 1 a plan view of a kitchen counter 10 having built therein an electric cooktop 11 comprising a solid glass plate heating surface 12 surrounded by a metal trim frame 13 and having an adjoining control panel 15 that includes a multiple position switch 16 for each one of the four plate surface heating elements for obtaining various rates of heat energy.
  • the solid glass plate heating surface 12 is of crystalline glass which has a milk-white opaque appearance with generally a starlight design or target 19 centered over each one of the four individual surface heating elements for assistance in locating the proper position of the cooking utensils.
  • the present cooktop invention could also be used as the cooktop of an electric range with an underlying oven, or it could be built as a single solid plate surface unit.
  • FIG. 2 is an enlarged plan view of a fragment of a single solid plat'e surface unit. It shows a source of heat 21; namely, an electrical resistance heating wire of closely wound sinuous configuration that is flattened and made in strip form so that it can be cut in varying lengths. The lengths are arranged in a parallel pattern to form a generally circular heated area; for example, the smallest lengths 23 lie the opposite sides of the unit and gradually increasing lengths 24, 25 and 26 are used as the center of the heating element is approached.
  • a source of heat 21 namely, an electrical resistance heating wire of closely wound sinuous configuration that is flattened and made in strip form so that it can be cut in varying lengths.
  • the lengths are arranged in a parallel pattern to form a generally circular heated area; for example, the smallest lengths 23 lie the opposite sides of the unit and gradually increasing lengths 24, 25 and 26 are used as the center of the heating element is approached.
  • FIG. 3 taken on the line 3-3 of FIG. 2.
  • the nearest end of the short strip 23 of the heating wire 21 is formed with a vertical elongated terminal 28 which extends downwardly for over several inches inthe drawing.
  • a similar terminal arrangement would be made on the opposite end of the heating wire 21.
  • the opposite end of strip 23 is adapted to be joined to the adjacent end of the strip 24 by means of a relatively large staple 30.
  • a similar connection is made at the opposite end of the strip 24 for joining it with the adjacent end of the strip 24 by means of another staple 30.
  • FIG. 4 shows the relative size of the staple 30 and the length of its two spikes 32.
  • These staples 30 arelwelded or otherwise fastened to the underside of the heating wire 21 and are adapted to be embedded in a high temperature semirigid insulating board 34, as is best seen inFlG. 3.
  • Single'spikes 35 are also fastened beneath the heating wire adjacent the midportion of each strip 23, 24, 25 and 26 so as to hold the heating wire onto the board 34 and prevent its movement and possible damage during manufacture, assembly and shipment.
  • a second layer of resilient lower temperature insulating material 37 such as fiberglass or the like is positioned beneath the insulating board 34.
  • the upper semirigid insulating board or pad 34 is a high temperature insulating material such as is made from molded fibers of silica and alumina to withstand temperatures as high as 2000" F., and it provides a positive support for the heating wire 21.
  • the lower insulating pad 37 has lower insulating properties and it is slightly compressed to exert a lifting force on the upper board and press the heating wire 21 into good thermal contact with the underside of the glass-ceramic plate 18.
  • the heater wire is preferably made of a resistance element known as Kanthal A-1 sold by the Kanthal'Corp. of Stamford, Conn., having about 5.5 percent of aluminum, 2.2 percent of chromium, 0.5 percent of cobalt and the balance iron.
  • Kanthal A-1 sold by the Kanthal'Corp. of Stamford, Conn.
  • the aluminum oxidizes and a layer of A1 is formed on the surface of the heater and this serves to prevent current leakage when the heater wire is in direct contact with the hot crystalline glass plate.
  • the glass-ceramic plate 12 is first adapted to be positioned over a shallow metal pan 40.
  • the metal pan 40 may be either circular or of generally rectangular form and it is adapted to be seated in a cooperating opening cut in the countertop 10.
  • the peripheral edge of the glass-ceramic plate 12 is adapted to be seated on a short step or ledge 42 that encircles the pan.
  • a continuous strip of adhesive material 41 which is a nonhardening plastic material such as silicone rubber which retains its elasticity and resilience as well as forms a waterproof seal. It is also a thermal insulator and a shock absorbing medium to prevent damage of the glass-ceramic plate due to mechanical impact.
  • a trim strip 47 may be used around the periphery of the glass 12 to make a more permanent installation.
  • the bottom of the recessed pan 40 is shown with a circular hole 46 formed therein into which one of the heating elements 14 is seated.
  • the bottom of the' heating element 14 is furnished with a circular metal pan 43 as a supporting base which is seated within the hole 46'of the recessed framework and supported by a peripheral flange 44 from the edge of the hole.
  • This pan 43 receives the insulating layers 37 and 34 which carry the heating wire 21 on the top thereof.
  • a small hole 49 is shown formed in the bottom of the pan for receiving an insulating bushing 50 that is a hollow bushing for receiving one of the terminals 28 of the heating wire 21 therethrough.
  • This terminal 28 is threaded at its lower end and it first receives a connector 51 of a lead wire 52 thereover and they are joined together by means of a fastening nut 53.
  • FIG. A second modification of the present invention is depicted in FIG. where the glass-ceramic plate 12 is a round disc and it cooperates with a closely wound sinuous flattened resistance wire 21 that is of continuous form and it is wound in a coil starting as a small circle at the center and increasing in size as it nears the outer limit of the coil.
  • a similar result could be accomplished by this spiral coil arrangement.
  • a similar fastening means to the staples 30 would be used for holding the heating wire 21 to the underlying semirigid insulating board 34.
  • the third modification of the present invention is shown in FIG. 6 wherein the underside of the glass plate is coated with a ceramic layer 55 of high electrical resistivity such as silica or silicone dioxide or alumina so as to reduce the possibility of current leakage through the glass plate when it is being operated at high temperatures.
  • a ceramic layer 55 of high electrical resistivity such as silica or silicone dioxide or alumina
  • FIG. 7 The fourth modification of the present invention is shown in FIG. 7 showing the heater wire 21 spaced away from the underside of the glass plate 12 by an insulating ring 57 positioned around the periphery of the heating element 14. Moreover the tips of the spikes of the staples 30 are folded over against the underside of the block 34 to prevent the heater wire from touching the glass.
  • a surface heater comprising a heated panel of glassceramic material, thermal insulating means in strip form for supporting the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a first lower layer of resilient insulating material carried by the bottom plate, a second upper layer of semirigid insulating board carried by the said resilient layer, and an electrical resistance heating element supported on the top surface of the insulating board and having terminal portions for making electrical connection thereto, means for fastening the heating element to the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit from terminal to terminal, the lower layer of resilient insulating material being slightly compressed to bias the heating element into good contact with the underside of the glass-ceramic panel.
  • a surface heater as recited in claim 1 wherein the said connecting means between the ends of adjacent bands of the heating element comprise staples that are permanently attached between adjacent bands of the heating element and have spikes embedded into the insulating board.
  • a surface heater comprising a heated panel of glassceramic material, thermal insulating means in strip form adapted to support the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a layer of semirigid insulating board carried by said bottom plate, an electrical resistance heating element supported on the top surface of the insulating board-and having terminal portions for making electrical connections thereto, means for fastening the heating element to the insulating board including spikes integral with the underside of the heating element which penetrate the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit between said terminal portions, and resilient means carried by said bottom supporting plate for biasing the insulating board and its supported heating element upward into good thermal contact with the underside of the glass-ceramic panel.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Surface Heating Bodies (AREA)

Abstract

A heated cooktop having a top glass-ceramic plate with one or more electrical resistance heating units adjacent the underside thereof to form one or more heated areas of the plate upon which a cooking utensil could be positioned for heating or cooking purposes. A heating unit has a base plate upon which are supported a first lower layer of resilient insulation material, a second layer of semirigid insulating board, and a closely wound, sinuous, electrical resistance heating wire of flattened cross section where the resistance wire is provided on its underside with fastening spikes that are embedded in the top of the insulating board. The top of the resistance wire is in heat transfer relationship with the glass-ceramic plate. The top plate is seated on a supporting surface independently of the heating units. One embodiment incorporates a strip of elastic material under the peripheral edge of the top plate and in contact with the supporting surface to prevent direct contact between the top plate and supporting surface, while sealing the joint therebetween from the accumulation of liquids and soil.

Description

United States Patent [72] Inventor Bohdan Hurko Louisville, Ky. [21] App1.No. 815,649 [22] Filed Apr. 14, 1969 [45] Patented Mar. 2, 1971 [73] Assignee General Electric Company [54] PLANAR SURFACE HEATER WITH INTEGRAL FASTENERS FOR HEATING ELEMENT 4 Claims, 7 Drawing Figs.
[52] U.S. Cl 219/464, 219/467, 219/468, 219/542 [51] Int. Cl H05b 3/68, H05b 3/06, l-lOSb 3/16 [50] Field of Search 219/464- [56] References Cited UNITED STATES PATENTS 3,496,336 2/1970 Hingorany et al. 219/464 2,799,765 7/1957 Jenkins et al. 219/459 2,997,568 8/1961 Leipo1detal.... 219/213 3,086,101 4/1963 Scofield 2 l 9/464X 3,191,004 6/1965 l-locker 219/461 3,316,390 4/1967 Gaugler et a1. 219/464 3,346,721 10/1967 Bassett, Jr. 219/465 3,391,372 7/1968 McLean 3,406,279 10/1968 Ziver ABSTRACT: A heated cooktop having a top glass-ceramic plate with one or more electrical resistance heating units adjacent the underside thereof to form one or more heated areas of the plate upon which a cooking utensil could be positioned for heating or cooking purposes. A heating unit has a base plate upon which are supported a first lower layer of resilient insulation material, a second layer of semirigid insulating board, and a closely wound, sinuous, electrical resistance heating wire of flattened cross section, where the resistance wire is provided on its underside with fastening spikes that are embedded in the top of the insulating board. The top of the resistance wire is in heat transfer relationship with the glassceramic plate. The top plate is seated on a supporting surface independently of the heating units. One embodiment incorporates a strip of elastic material under the peripheral edge of the top plate and in contact with the supporting surface to prevent direct contact between the top plate and supporting surface, while sealing the joint therebetween from the accumulation of liquids and soil.
Z8 I j-7L1 PATE sum 1 0r 2 INVENTOR BOHDAN HURKO HlS ATTORNEY PLANAR SURFACE HEATER WITH INTEGRAL FASTENERS FOR HEATING ELEMENT BACKGROUND OF THE INVENTION The average housewife is becoming more interested in hav ing pleasing appearance designs around her home, as well as enjoying the improved ease of cleaning household kitchen appliances. Particular reference is made here to domestic ranges. As to the ease of cleaning the oven of a range, there has been widespread acceptance of the pyrolytic, self-cleaning oven such as is taught in US. Pat. No. 3,121,158 of Bohdan l-Iurko, the present inventor. The solution of the problem of maintaining a clean oven has turned the attention of the housewife to the ease of cleaning the cooktop. A standard electric cooktop is usually provided with a plurality of metal sheathed electrical resistance heating elements which are each wound in the form of a coil and positioned in an opening formed in the cooktop. Each heating element is adapted to support a cooking utensil thereon. These metal sheathed heating elements are self-cleaning of food soil due to the high temperatures they are allowed to reach once they are energized, but it is possible for spillovers to drain through the heating element and accumulate in a collecting pan located beneath the cooktop.
In order to reduce this cleaning problem, cooktops or solid plate surface units have been proposed in which the exposed surface is formed of a glass-ceramic panel. In particular, a generally milk-white, opaque glass-ceramic material has been suggested for this use. Examples of such material are the crystalline glass sold under the trademarks Pyroceram, Cer-Vit, and Hercuvit. The opaque crystalline glass, because of its smooth surface, not only presents a pleasing appearance but it is also readily cleanable. There has been a problem, however, in these glass-ceramic heating units in obtaining satisfactory heating rates as compared with those available from the traditional, exposed, metal sheathed electrical resistance heating units.
An object of the present invention is to provide an improved solid plate surface heating unit which is pleasing in appearance, efficient in operation'and competitive with the operation of present day metal sheathed electrical resistance heating elements, as well as resistant to mechanical impact and serviceable over a long period of time.
A further object of the present invention is to provide a solid plate surface heating unit of the class described where the plate is of crystalline glass and the source of heat is a sinuous, flattened, electrical resistance wire with special means for fastening the wire to an insulating base.
A further object of the present invention is to provide a solid plate surface heating unit of the class described with a moisture proof resilient sealing means around the periphery of the plate that serves as a shock absorbing support means therefor.
A further object of the present invention is to provide a solid plate surface unit of the class described where the source of heat energy is supported on a'resilient insulating medium which serves to hold the heat source in form contact with the underside of the plate for good thermal conductivity.
A further object of the present invention is to provide a solid plate surface unit of the class described with insulating means for supporting the plate from a cooktop surface.
SUMMARY OF THE INVENTION The present invention, in accordance with one form thereof, relates to a solid plate surface heating unit comprising a crystalline glass plate supported at its periphery by a sealing medium. Beneath the plate is a closely wound, sinuous, electrical resistance wire flattened in cross section, and in strip form. There are means for fastening the resistance wire to an insulating base whereby the crystalline plate is protected against mechanical impacts. The glass also has generally uniform temperature gradients due to a large contact surface area relationship between the heating means and the plate.
BRIEF DESCRIPTION OF THE DRAWINGS My invention will be better understood from the following description taken in conjunction with the accompanying drawings and its scope will be pointed out in the appended claims. 1
FIG. 1 is a top plan view of an electric cooktop embodying the present invention where the cooktop has a single solid glass plate with a series of four heated surface units and a related control panel. I
FIG. 2 is an enlarged fragmentary plan view of a single solid plate surface unit with the crystalline glass plate removed to show the closely wound, sinuous, flattened electrical resistance wire in strip form that is supported on layers of insulating material of generally circular form. It will be understood that the heating element would ordinarily not be visible through the opaque glass.
FIG. 3 is a fragmentary cross-sectional elevational view on a slightly larger scale of the solid plate surface heating element taken on the line 3-3 of FIG. 2 and showing the supporting base plate for the surface heating element as well as two layers of insulating medium which carry the resistance wire on the top thereof and press the wire into good thermal contact with the underside of the crystalline plate. Particular attention is directed to the presence of staples fastened to the underside of the resistance wire and embedded in the top layer of the semirigid insulating medium to hold the wire in place.
FIG. 4 is a fragmentary detailed view of the staple method of joining the adjacent ends of two strips of the resistance wire.
FIG. 5 is a second modification of the present invention wherein the closely would sinuous .flattened electrical resistance heating wire is wound in a spiral coil somewhat resembling the configuration of a metal sheathed resistance heating element.
FIG. 6 is a fragmentary cross-sectional elevational view 'of a third modification of the present invention showing a ceramic layer formed on the underside of the glass plate where the ceramic layer has a high electrical resistivity.
FIG. 7 is a fragmentary cross-sectional elevational view similar to that of FIG. 6 of a fourth modification of the present invention where the heating wire is shown spaced away from the underside of the glass plate.
DESCRIPTION OF THE PREFERRED EMBODIMENT Turning now to a consideration of the drawings, and in particular to FIG. 1 there is shown a plan view of a kitchen counter 10 having built therein an electric cooktop 11 comprising a solid glass plate heating surface 12 surrounded by a metal trim frame 13 and having an adjoining control panel 15 that includes a multiple position switch 16 for each one of the four plate surface heating elements for obtaining various rates of heat energy. The solid glass plate heating surface 12 is of crystalline glass which has a milk-white opaque appearance with generally a starlight design or target 19 centered over each one of the four individual surface heating elements for assistance in locating the proper position of the cooking utensils. It will be understood by those skilled in this art that the present cooktop invention could also be used as the cooktop of an electric range with an underlying oven, or it could be built as a single solid plate surface unit.
FIG. 2 is an enlarged plan view of a fragment of a single solid plat'e surface unit. It shows a source of heat 21; namely, an electrical resistance heating wire of closely wound sinuous configuration that is flattened and made in strip form so that it can be cut in varying lengths. The lengths are arranged in a parallel pattern to form a generally circular heated area; for example, the smallest lengths 23 lie the opposite sides of the unit and gradually increasing lengths 24, 25 and 26 are used as the center of the heating element is approached.
Attention is now directed to the slightly enlarged fragmentary view of FIG. 3 taken on the line 3-3 of FIG. 2. The nearest end of the short strip 23 of the heating wire 21 is formed with a vertical elongated terminal 28 which extends downwardly for over several inches inthe drawing. A similar terminal arrangement would be made on the opposite end of the heating wire 21. The opposite end of strip 23 is adapted to be joined to the adjacent end of the strip 24 by means of a relatively large staple 30. A similar connection is made at the opposite end of the strip 24 for joining it with the adjacent end of the strip 24 by means of another staple 30.
The enlarged fragmentary view of FIG. 4 shows the relative size of the staple 30 and the length of its two spikes 32. These staples 30 arelwelded or otherwise fastened to the underside of the heating wire 21 and are adapted to be embedded in a high temperature semirigid insulating board 34, as is best seen inFlG. 3. Single'spikes 35 are also fastened beneath the heating wire adjacent the midportion of each strip 23, 24, 25 and 26 so as to hold the heating wire onto the board 34 and prevent its movement and possible damage during manufacture, assembly and shipment.
A second layer of resilient lower temperature insulating material 37 such as fiberglass or the like is positioned beneath the insulating board 34. The upper semirigid insulating board or pad 34 is a high temperature insulating material such as is made from molded fibers of silica and alumina to withstand temperatures as high as 2000" F., and it provides a positive support for the heating wire 21. The lower insulating pad 37 has lower insulating properties and it is slightly compressed to exert a lifting force on the upper board and press the heating wire 21 into good thermal contact with the underside of the glass-ceramic plate 18.
The heater wire is preferably made of a resistance element known as Kanthal A-1 sold by the Kanthal'Corp. of Stamford, Conn., having about 5.5 percent of aluminum, 2.2 percent of chromium, 0.5 percent of cobalt and the balance iron. The aluminum oxidizes and a layer of A1 is formed on the surface of the heater and this serves to prevent current leakage when the heater wire is in direct contact with the hot crystalline glass plate.
As for the means of supporting the surface heating element 14, attention is directed to the cross-sectional elevational view of FIG. 3. The glass-ceramic plate 12 is first adapted to be positioned over a shallow metal pan 40. The metal pan 40 may be either circular or of generally rectangular form and it is adapted to be seated in a cooperating opening cut in the countertop 10. The peripheral edge of the glass-ceramic plate 12 is adapted to be seated on a short step or ledge 42 that encircles the pan. It is well to seal the peripheral edge of the glassceramic plate 12 with respect to the supporting step or ledge 42 of the pan 40, and this is accomplished by means of a continuous strip of adhesive material 41 which is a nonhardening plastic material such as silicone rubber which retains its elasticity and resilience as well as forms a waterproof seal. It is also a thermal insulator and a shock absorbing medium to prevent damage of the glass-ceramic plate due to mechanical impact. A trim strip 47 may be used around the periphery of the glass 12 to make a more permanent installation.
The bottom of the recessed pan 40 is shown with a circular hole 46 formed therein into which one of the heating elements 14 is seated. The bottom of the' heating element 14 is furnished with a circular metal pan 43 as a supporting base which is seated within the hole 46'of the recessed framework and supported by a peripheral flange 44 from the edge of the hole. This pan 43 receives the insulating layers 37 and 34 which carry the heating wire 21 on the top thereof. A small hole 49 is shown formed in the bottom of the pan for receiving an insulating bushing 50 that is a hollow bushing for receiving one of the terminals 28 of the heating wire 21 therethrough. This terminal 28 is threaded at its lower end and it first receives a connector 51 of a lead wire 52 thereover and they are joined together by means of a fastening nut 53.
A second modification of the present invention is depicted in FIG. where the glass-ceramic plate 12 is a round disc and it cooperates with a closely wound sinuous flattened resistance wire 21 that is of continuous form and it is wound in a coil starting as a small circle at the center and increasing in size as it nears the outer limit of the coil. Thus, instead of cutting the resistance wire into varying lengths and joining the lengths together in a parallel arrangement to form a source of heat energy of relatively large surface area, a similar result could be accomplished by this spiral coil arrangement. A similar fastening means to the staples 30 would be used for holding the heating wire 21 to the underlying semirigid insulating board 34.
The third modification of the present invention is shown in FIG. 6 wherein the underside of the glass plate is coated with a ceramic layer 55 of high electrical resistivity such as silica or silicone dioxide or alumina so as to reduce the possibility of current leakage through the glass plate when it is being operated at high temperatures.
The fourth modification of the present invention is shown in FIG. 7 showing the heater wire 21 spaced away from the underside of the glass plate 12 by an insulating ring 57 positioned around the periphery of the heating element 14. Moreover the tips of the spikes of the staples 30 are folded over against the underside of the block 34 to prevent the heater wire from touching the glass.
Modifications of this invention will occur to those skilled in this art, therefore it is to be understood that this invention is not limited to the particular embodiments disclosed but that it is intended to cover all modifications which are within the true spirit and scope of this invention as claimed.
I claim:
1. A surface heater comprising a heated panel of glassceramic material, thermal insulating means in strip form for supporting the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a first lower layer of resilient insulating material carried by the bottom plate, a second upper layer of semirigid insulating board carried by the said resilient layer, and an electrical resistance heating element supported on the top surface of the insulating board and having terminal portions for making electrical connection thereto, means for fastening the heating element to the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit from terminal to terminal, the lower layer of resilient insulating material being slightly compressed to bias the heating element into good contact with the underside of the glass-ceramic panel. I i
2. A surface heater as recited in claim 1 wherein the said fastening means for the heating element includes spikes integral with the'underside of the element which penetrate the insulating board.
3. A surface heater as recited in claim 1 wherein the said connecting means between the ends of adjacent bands of the heating element comprise staples that are permanently attached between adjacent bands of the heating element and have spikes embedded into the insulating board.
4. A surface heater comprising a heated panel of glassceramic material, thermal insulating means in strip form adapted to support the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a layer of semirigid insulating board carried by said bottom plate, an electrical resistance heating element supported on the top surface of the insulating board-and having terminal portions for making electrical connections thereto, means for fastening the heating element to the insulating board including spikes integral with the underside of the heating element which penetrate the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit between said terminal portions, and resilient means carried by said bottom supporting plate for biasing the insulating board and its supported heating element upward into good thermal contact with the underside of the glass-ceramic panel.

Claims (4)

1. A surface heater comprising a heated panEl of glass-ceramic material, thermal insulating means in strip form for supporting the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a first lower layer of resilient insulating material carried by the bottom plate, a second upper layer of semirigid insulating board carried by the said resilient layer, and an electrical resistance heating element supported on the top surface of the insulating board and having terminal portions for making electrical connection thereto, means for fastening the heating element to the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit from terminal to terminal, the lower layer of resilient insulating material being slightly compressed to bias the heating element into good contact with the underside of the glass-ceramic panel.
2. A surface heater as recited in claim 1 wherein the said fastening means for the heating element includes spikes integral with the underside of the element which penetrate the insulating board.
3. A surface heater as recited in claim 1 wherein the said connecting means between the ends of adjacent bands of the heating element comprise staples that are permanently attached between adjacent bands of the heating element and have spikes embedded into the insulating board.
4. A surface heater comprising a heated panel of glass-ceramic material, thermal insulating means in strip form adapted to support the periphery of the panel from a metal base, at least one heating unit mounted beneath the panel and comprising a bottom supporting plate attached to said metal base, a layer of semirigid insulating board carried by said bottom plate, an electrical resistance heating element supported on the top surface of the insulating board and having terminal portions for making electrical connections thereto, means for fastening the heating element to the insulating board including spikes integral with the underside of the heating element which penetrate the insulating board, said heating element comprising a series of bands of sinuous flattened resistance wire, and means for connecting together each end of adjacent bands to form a continuous circuit between said terminal portions, and resilient means carried by said bottom supporting plate for biasing the insulating board and its supported heating element upward into good thermal contact with the underside of the glass-ceramic panel.
US815649A 1969-04-14 1969-04-14 Planar surface heater with integral fasteners for heating element Expired - Lifetime US3567906A (en)

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US3737624A (en) * 1970-09-16 1973-06-05 Progressive Products Co Electric grill with a thin-film heating element
US3749883A (en) * 1972-07-17 1973-07-31 Emerson Electric Co Electric heater assembly
US3833793A (en) * 1972-08-05 1974-09-03 J Hughes Electrical cooker unit for a ceramic glass plate type electrical cooker
DE2551137A1 (en) * 1975-11-14 1977-05-18 Ego Elektro Blanc & Fischer ELECTRIC RADIATION HEATING FOR A CERAMIC GLASS PANEL
FR2345884A1 (en) * 1976-03-26 1977-10-21 Gen Electric SURFACE HEATING UNIT
US4100395A (en) * 1976-06-29 1978-07-11 Glenro, Inc. Expanded element radiant heating device
DE2729930A1 (en) 1977-07-02 1979-01-11 Karl Fischer Radiation heater for glass ceramic cooker hob - has insulating ring with rebate and base plate holding support plate for heating element
JPS54144265A (en) * 1978-04-29 1979-11-10 Jenaer Glaswerk Schott & Gen Heating and*or cooking panel of glass or vitreous ceramic with fixed frame and fitting element
FR2423728A1 (en) * 1978-04-21 1979-11-16 Jenaer Glaswerk Schott & Gen VITRIFIED CERAMIC COOKING SURFACE, SURROUNDED BY A FRAMING GLUED WITH AN ADHESIVE PRESENTING A PERMANENT ELASTICITY
DE2821662A1 (en) * 1978-05-18 1979-11-22 Thielmann Ag Kg Geb BUILT-IN HOB
DE3131463A1 (en) * 1981-08-08 1983-02-24 Fischer, Karl, 7519 Oberderdingen ELECTRIC HOTPLATE WITH A SURROUNDING RING
US4471214A (en) * 1981-07-24 1984-09-11 E.G.O. Elektro-Gerate Blanc Und Fischer Electrical heating element for heating a plate and process for the production thereof
US4659906A (en) * 1984-01-20 1987-04-21 Vitronics Corporation Infrared panel emitter and method of producing the same
DE3606117A1 (en) * 1986-02-26 1987-08-27 Ego Elektro Blanc & Fischer Cooking unit with radiant heating element
GB2197169A (en) * 1986-10-25 1988-05-11 Micropore International Ltd Radiant heaters
US4778978A (en) * 1986-02-26 1988-10-18 E.G.O. Elektro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
US4788414A (en) * 1986-04-24 1988-11-29 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant heating unit for cookers or the like
US4843218A (en) * 1985-12-20 1989-06-27 Bosch-Siemens Hausgerate Gmbh Heating element for thermal heating devices, especially cooking stations
DE3914990A1 (en) * 1989-05-06 1990-11-08 Ako Werke Gmbh & Co RADIATION HEATING DEVICE
DE2760339C2 (en) * 1975-11-14 1994-04-14 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De
DE4229213A1 (en) * 1992-09-03 1994-11-03 Franz Josef Ridder Ceran EURO-UNIVERSAL 580 x 510 m/m hob (cool top platform), in the colours white, brown and Inoxx 18/10
EP0619690A3 (en) * 1993-04-08 1995-01-04 Schott Glaswerke Protective means for transport, assembly and operating assistance for glass and ceramic glass plates.
US5432320A (en) * 1992-10-20 1995-07-11 Schott Glaswerke Cooking range
US5498853A (en) * 1992-09-03 1996-03-12 E.G.O. Elektro-Gerate Blanc U. Fischer Heater, particularly for kitchen appliances
US5530224A (en) * 1994-03-25 1996-06-25 Sassman; Mark S. System and method for retrofitting cooktops with a ceramic glass cooking surface
USD386945S (en) * 1996-10-15 1997-12-02 Mendoza Carmelyn M Combined disposable spill and splatter cover for a range top
WO1998012899A1 (en) * 1996-09-21 1998-03-26 Ako-Werke Gmbh & Co. Kg Radiant heating element with a metal foil heat conductor
US5753892A (en) * 1995-02-25 1998-05-19 E.G.O. Elektro-Gerate Blanc Und Fischer Gmbh & Co. Kg Electric radiant heater and method for its manufacture
US5791336A (en) * 1997-02-13 1998-08-11 Maytag Corporation Frameless cooktop
US5796075A (en) * 1992-03-09 1998-08-18 E.G.O. Elektro-Gerate Blanc Und Fisher Gmbh & Co. Kg Heater, particularly for kitchen appliances
US5837975A (en) * 1996-07-29 1998-11-17 Emerson Electric Co. Corrugated strip, radiant heater element
US6018147A (en) * 1998-04-01 2000-01-25 Ceramaspeed Limited Base for an electric heater and method of manufacture
US6051817A (en) * 1997-07-15 2000-04-18 Ako-Werke Gmbh & Co. Kg Heating conductor for radiant heating bodies of a cooking hob
US6087637A (en) * 1998-06-30 2000-07-11 Schott-Geraete Gmbh Table-top cooking appliance
AU728302B2 (en) * 1997-07-15 2001-01-04 Diehl Ako Stiftung & Co. Kg Heating conductor for radiant heating bodies of a cooking hob
US6276357B1 (en) * 1999-02-02 2001-08-21 Bsh Bosch Und Siemens Hausgeraete Gmbh Cooktop with a cooktop frame
USD464845S1 (en) 2001-06-21 2002-10-29 Maytag Corporation Graphic burner grate on a smooth ceramic cooktop of a gas cooking appliance
US20040159651A1 (en) * 2003-02-19 2004-08-19 Maytag Corporation One-piece burner element/switch support for a cooktop
DE10258726B4 (en) * 2002-12-05 2007-06-21 E.G.O. Elektro-Gerätebau GmbH Heating device for a surface heating
US7573004B1 (en) * 2006-02-21 2009-08-11 Structured Materials Inc. Filament support arrangement for substrate heating apparatus
US20130062130A1 (en) * 2011-09-14 2013-03-14 Hutchinson Electric or Hybrid Motor Vehicle Bodywork Structure, This Vehicle, and Method for Controlling/Modifying the Temperature of the Passenger Compartment Thereof
USD696894S1 (en) * 2011-10-28 2014-01-07 Electrolux Home Products Corporation N.V. Induction cooker
DE102013113046A1 (en) 2013-11-26 2015-05-28 Aixtron Se Supporting or connecting elements on a heating element of a CVD reactor
US20150201465A1 (en) * 2014-01-10 2015-07-16 General Electric Company Oven range appliance
EP2217861B1 (en) * 2007-10-12 2017-08-02 BSH Hausgeräte GmbH Gas cooking hob

Cited By (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737624A (en) * 1970-09-16 1973-06-05 Progressive Products Co Electric grill with a thin-film heating element
US3749883A (en) * 1972-07-17 1973-07-31 Emerson Electric Co Electric heater assembly
US3833793A (en) * 1972-08-05 1974-09-03 J Hughes Electrical cooker unit for a ceramic glass plate type electrical cooker
US4161648A (en) * 1975-11-14 1979-07-17 E. G. O. Elektro-Geraete Blanc Und Fischer Electrical radiation heater for a glass ceramic plate
FR2331931A1 (en) * 1975-11-14 1977-06-10 Ego Elektro Blanc & Fischer ELECTRIC RADIATION HEATING DEVICE FOR CERAMIC GLASS PLATE
DE2760339C2 (en) * 1975-11-14 1994-04-14 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De
DE2551137A1 (en) * 1975-11-14 1977-05-18 Ego Elektro Blanc & Fischer ELECTRIC RADIATION HEATING FOR A CERAMIC GLASS PANEL
FR2345884A1 (en) * 1976-03-26 1977-10-21 Gen Electric SURFACE HEATING UNIT
US4100395A (en) * 1976-06-29 1978-07-11 Glenro, Inc. Expanded element radiant heating device
DE2729930A1 (en) 1977-07-02 1979-01-11 Karl Fischer Radiation heater for glass ceramic cooker hob - has insulating ring with rebate and base plate holding support plate for heating element
FR2423728A1 (en) * 1978-04-21 1979-11-16 Jenaer Glaswerk Schott & Gen VITRIFIED CERAMIC COOKING SURFACE, SURROUNDED BY A FRAMING GLUED WITH AN ADHESIVE PRESENTING A PERMANENT ELASTICITY
US4243016A (en) * 1978-04-21 1981-01-06 Jenaer Glaswerk Schott & Gen. Vitreous ceramic cooker hob plate with permanently elastically adhesively attached circumferentially surrounding frame
FR2424486A1 (en) * 1978-04-29 1979-11-23 Jenaer Glaswerk Schott & Gen HEATING OR COOKING SURFACES IN GLASS OR VITROCERAMIC WITH A FRAME AND REINFORCEMENTS FIXED BY GLUING
JPS54144265A (en) * 1978-04-29 1979-11-10 Jenaer Glaswerk Schott & Gen Heating and*or cooking panel of glass or vitreous ceramic with fixed frame and fitting element
US4492217A (en) * 1978-04-29 1985-01-08 Jenaer Glaswerk Schott & Gen. Panel assembly, particularly a glass or vitreous ceramic heater or cooker panel assembly
DE2821662A1 (en) * 1978-05-18 1979-11-22 Thielmann Ag Kg Geb BUILT-IN HOB
US4471214A (en) * 1981-07-24 1984-09-11 E.G.O. Elektro-Gerate Blanc Und Fischer Electrical heating element for heating a plate and process for the production thereof
DE3131463A1 (en) * 1981-08-08 1983-02-24 Fischer, Karl, 7519 Oberderdingen ELECTRIC HOTPLATE WITH A SURROUNDING RING
US4659906A (en) * 1984-01-20 1987-04-21 Vitronics Corporation Infrared panel emitter and method of producing the same
US4843218A (en) * 1985-12-20 1989-06-27 Bosch-Siemens Hausgerate Gmbh Heating element for thermal heating devices, especially cooking stations
US5001328A (en) * 1986-02-26 1991-03-19 E.G.O. Eleckro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
US4778978A (en) * 1986-02-26 1988-10-18 E.G.O. Elektro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
US4900899A (en) * 1986-02-26 1990-02-13 E.G.O. Elektro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
DE3606117A1 (en) * 1986-02-26 1987-08-27 Ego Elektro Blanc & Fischer Cooking unit with radiant heating element
US4788414A (en) * 1986-04-24 1988-11-29 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant heating unit for cookers or the like
US4864105A (en) * 1986-10-25 1989-09-05 Ceramaspeed Limited Radiant heaters
GB2197169B (en) * 1986-10-25 1990-04-04 Micropore International Ltd Radiant heaters
AU611398B2 (en) * 1986-10-25 1991-06-13 Micropore International Limited Radiant heaters
GB2197169A (en) * 1986-10-25 1988-05-11 Micropore International Ltd Radiant heaters
DE3914990A1 (en) * 1989-05-06 1990-11-08 Ako Werke Gmbh & Co RADIATION HEATING DEVICE
US5796075A (en) * 1992-03-09 1998-08-18 E.G.O. Elektro-Gerate Blanc Und Fisher Gmbh & Co. Kg Heater, particularly for kitchen appliances
DE4229213A1 (en) * 1992-09-03 1994-11-03 Franz Josef Ridder Ceran EURO-UNIVERSAL 580 x 510 m/m hob (cool top platform), in the colours white, brown and Inoxx 18/10
US5498853A (en) * 1992-09-03 1996-03-12 E.G.O. Elektro-Gerate Blanc U. Fischer Heater, particularly for kitchen appliances
US5432320A (en) * 1992-10-20 1995-07-11 Schott Glaswerke Cooking range
US6054203A (en) * 1993-04-08 2000-04-25 Schott Glas Transport shield, assembly aid and operating means for glass and glass ceramic panels
EP0619690A3 (en) * 1993-04-08 1995-01-04 Schott Glaswerke Protective means for transport, assembly and operating assistance for glass and ceramic glass plates.
US6063478A (en) * 1993-04-08 2000-05-16 Schott Glaswerke Transport shield, assembly aid and operating means for glass ceramic panels
US5530224A (en) * 1994-03-25 1996-06-25 Sassman; Mark S. System and method for retrofitting cooktops with a ceramic glass cooking surface
US5753892A (en) * 1995-02-25 1998-05-19 E.G.O. Elektro-Gerate Blanc Und Fischer Gmbh & Co. Kg Electric radiant heater and method for its manufacture
US5837975A (en) * 1996-07-29 1998-11-17 Emerson Electric Co. Corrugated strip, radiant heater element
DE19638640A1 (en) * 1996-09-21 1998-04-02 Ako Werke Gmbh & Co Radiant heater with a metal foil heating conductor
WO1998012899A1 (en) * 1996-09-21 1998-03-26 Ako-Werke Gmbh & Co. Kg Radiant heating element with a metal foil heat conductor
DE19638640C2 (en) * 1996-09-21 2000-11-30 Diehl Ako Stiftung Gmbh & Co Radiant heater with a metal foil heating conductor
USD386945S (en) * 1996-10-15 1997-12-02 Mendoza Carmelyn M Combined disposable spill and splatter cover for a range top
US5791336A (en) * 1997-02-13 1998-08-11 Maytag Corporation Frameless cooktop
US6051817A (en) * 1997-07-15 2000-04-18 Ako-Werke Gmbh & Co. Kg Heating conductor for radiant heating bodies of a cooking hob
AU728302B2 (en) * 1997-07-15 2001-01-04 Diehl Ako Stiftung & Co. Kg Heating conductor for radiant heating bodies of a cooking hob
US6018147A (en) * 1998-04-01 2000-01-25 Ceramaspeed Limited Base for an electric heater and method of manufacture
US6087637A (en) * 1998-06-30 2000-07-11 Schott-Geraete Gmbh Table-top cooking appliance
US6276357B1 (en) * 1999-02-02 2001-08-21 Bsh Bosch Und Siemens Hausgeraete Gmbh Cooktop with a cooktop frame
USD464845S1 (en) 2001-06-21 2002-10-29 Maytag Corporation Graphic burner grate on a smooth ceramic cooktop of a gas cooking appliance
DE10258726B4 (en) * 2002-12-05 2007-06-21 E.G.O. Elektro-Gerätebau GmbH Heating device for a surface heating
US20040159651A1 (en) * 2003-02-19 2004-08-19 Maytag Corporation One-piece burner element/switch support for a cooktop
US6888107B2 (en) 2003-02-19 2005-05-03 Maytag Corporation One-piece burner element/switch support for a cooktop
US7573004B1 (en) * 2006-02-21 2009-08-11 Structured Materials Inc. Filament support arrangement for substrate heating apparatus
EP2217861B1 (en) * 2007-10-12 2017-08-02 BSH Hausgeräte GmbH Gas cooking hob
US20130062130A1 (en) * 2011-09-14 2013-03-14 Hutchinson Electric or Hybrid Motor Vehicle Bodywork Structure, This Vehicle, and Method for Controlling/Modifying the Temperature of the Passenger Compartment Thereof
US10086675B2 (en) * 2011-09-14 2018-10-02 Hutchinson Electric or hybrid motor vehicle bodywork structure, this vehicle, and method for controlling/modifying the temperature of the passenger compartment thereof
USD696893S1 (en) * 2011-10-28 2014-01-07 Electrolux Home Products Corporation N.V. Induction cooker
USD696894S1 (en) * 2011-10-28 2014-01-07 Electrolux Home Products Corporation N.V. Induction cooker
DE102013113046A1 (en) 2013-11-26 2015-05-28 Aixtron Se Supporting or connecting elements on a heating element of a CVD reactor
US20150201465A1 (en) * 2014-01-10 2015-07-16 General Electric Company Oven range appliance
US9521708B2 (en) * 2014-01-10 2016-12-13 Haier Us Appliance Solutions, Inc. Oven range appliance

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