CA1099791A - Enameled metal turntable in a combination microwave and electric oven - Google Patents
Enameled metal turntable in a combination microwave and electric ovenInfo
- Publication number
- CA1099791A CA1099791A CA286,731A CA286731A CA1099791A CA 1099791 A CA1099791 A CA 1099791A CA 286731 A CA286731 A CA 286731A CA 1099791 A CA1099791 A CA 1099791A
- Authority
- CA
- Canada
- Prior art keywords
- turntable
- oven
- microwave
- oven cavity
- electric
- 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.)
- Expired
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- Electric Ovens (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
Abstract of the Disclosure A sheath heater is disposed between a turntable and a bottom wall of an oven cavity in a combination microwave and electric oven. The turntable is made of an enameled metal plate to ensure stable or uniform cooking in both the microwave cooking and electric heating cooking modes. In a preferred form, openings are formed in the enameled metal turntable to stir the microwave energy in the microwave cooking mode.
Description
~ 9~
-The present invention xelates to a combination micro-wave and electric oven and~ more particularly, to such an oven includ~n~ a turntable.
~ combination microwave and electric oven has been developed as disclosed in U.S. Patent No. 3,172,98~ entitled "COMBINATION EIJECTRIC AND ELECTRONIC OVENS " on March 9, 1965 . A
turn~able is provided to faci~itats uniform microwave cooking, and a heater mean~ is disposed below the turntable to maintain the oven temperature at a predetermined value in the electric heating mode. ` -In the conventional combination microwave and electric oven, a~heater means is disposed between a stainless steel turn-table and a bottom wall of an oven cavity. The conventional combinatlon microwave and electric oven such as disclosed in the above~mentioned U.S. Patent NO. 3,172,987 is very large and, therefore, a suf~icient space is provided between the stainless steel turntable and the heater means~
However! when a compact si~e combination microwave and electric oven is desired to be fabricated, the distance between the twrntable and the heater means is unavoidably reduced. When ~ the turntable is made of stainless steel, uniform cooking can not -~ be achieved in the electric cooking mode, because the stainless steel turntable does not have a uniform surface temperature when ~he heater means is close to the turntable.
Moreovar, there is a possibility of sparks being gener-ated by the stainless steel t~rntable when microwaves of a high frequency, ~or example, 2450MHZ, are introduced into the oven cavity~
' , ~ ~ I
~997~
Accord,ing to the present invention there is provided a combination microwave and electric oven comprising an oven cavity, microwave generation means for microwave cooking pur-poses, a turntable disposed in a lower seclion of the oven cavity, and a heater means disposed be~ween the turntable and a bottom wall of the oven cavity for electric cooking purposes, wherein the turntable is a metallic turntable coated with heat resistant non-metallic material to prevent the occurence of sparks when the turntable is rotated during microwave cooking operations and to ensure the even distribution of heat within the turntable during electric cooking operation.
According to the present invention, there is also provided a turntable for use in a combination microwave and electric oven including an oven cavity, microwave generation means for microwave cooking purposes and a heater means disposed between the turntable and a bottom wall of the oven cavity for electric cooking purposes, the turntable being disposed in a lower section of the oven cavity and comprising: a metal ,;
body of a high thermal conductivity for reflecting microwaves ~ '-and transmitting heat energy; and a heat resistant non-metallic materlal layer formed on the metal body for preventing an occurrence of sparks during microwave cooking and for uniformly distributing the heat energy when the heater means is energi~ed.
' ~ , ~ ' , `;
:~99~
Such an oven can be of a compact size and yet can achieve stable and uniform cooking in both microwave cooking and elactric heating cooking modes.
The heat resistant non-metallic coating on the metal turntable, which may be an enamel, functions to render more uniform the surface temperature of the turntable in the electric heating cooking mode, and to prevent the occurrence of sparks in the microwave cooking mode. In a preferred form, openings are formed in the turntable to stlr the microwave energy in the microwave cooking mode during rotation of the turntable.
The present invention will be more fully understood from the detailed description given below by way of example of preferred embodiments thereoE and with reference to the accom- ~ ;
panying drawings, which are given by way of illustration only and are not limita~ive of the present inven-tion, in which:
Figure 1 is a sectional view of a combination micro-wave and electric oven including an embodiment of an enameled metal turntable;
Figure 2 is a sectional view of the enameled metal turntable employed within the oven of Figure l;
Figure 3 is a plan view showing the enameled metal turntable of Figure 2 and showing in dotted lines a coupler for driving the turntable;
Figure 4 is a perspective view of the coupler shown in Figure 3;
.
- 2a -,, ~9~
Figure 5 is a plan view oE another embodiment of an enameled metal turn-table;
Figure 6 is a sectional view of the enameled turn-table as seen at VI-VI o~ Figure 5.
Figure 1 shows a combination mi.crowave and electric oven 10 which mainly comprises an oven wall 12 defining an oven cavity, an enameled metal turntable 14 for supportin~ a foods-tuff mounted thereon, and a sheath heater 16 disposed between the turntable 14 and the bottom wall o~ the oven cavity in a ~ashion -to surround a coupler 30 described below.
An upper heater unit 18 compri.ses a sheath heater 180 and a reflec-tion plate 182. The upper heater unit 18 and -the sheath heater ].6 function, in combination, to heat the oven in an electric heating cooking mode. A hea-t insulating wall or an athermanous wall 20 made of, for example, glass wool, asbestos or calcium silicate is provided in such a manner as to surround ;' the oven wall 12, whereby -the oven cavity is readily maintained ~ .
: at a high temperature in the electric heating cooking mode.
l~icrowave energy genera-ted from a magnetron 22 is intro-~; 20 duced into the oven cavity through a waveguide 24 for performing ; microwave cooking~ A power supply unit 25 is disposed outside the oven cavity.
, The enameled metal turntable 14 is driven to rotate in :~
both the microwave cooking mode and the electric hea-ting cooking mode through the use of a turntable motor 26, a drive mechanism ~! 28, and the coupler 30.
,1 Figure 2 shows a sectional view of the enameled metal -turntable 14, which mainly comprises a steel plate 140 coated -~
with enamel 142. Coupling projec-tions 144 are formed on -the bottom 1~99~
surface of the enameled metal tuxntable 14. I'he enameled metal turntable 14 is removably engaged with the coupler 30 through the use of the coupling projections 144. The thickness of the enamel 1~2 is preferably in the range from 0.1 through O.5 mm.
Figure 3 shows the enameled metal turntable 14 engaged with the coupler 30. Like elements corresponding to those of Figures 1 and 2 are indicated by like numerals.
The enameled metal turntable 14 i9 driven to rotate about the center thereo~, and supportiny roll~rs 3~ are rotatably fixed to the bottom wall of the oven cavity at desired positions to ensure stable rotation of the enameled metal turntable 14.
- Figure 4 show~ the coupler 30, which is made of heat-resisting plastics and has projections 3QO which are engaged with the coupling pro~ections 144 for rotating the enameled metal ~-~ turntable 14.
-~ Figures 5 and 6 show another embodiment of the enameled metal turntable. Like elements corresponding to those of Figures
-The present invention xelates to a combination micro-wave and electric oven and~ more particularly, to such an oven includ~n~ a turntable.
~ combination microwave and electric oven has been developed as disclosed in U.S. Patent No. 3,172,98~ entitled "COMBINATION EIJECTRIC AND ELECTRONIC OVENS " on March 9, 1965 . A
turn~able is provided to faci~itats uniform microwave cooking, and a heater mean~ is disposed below the turntable to maintain the oven temperature at a predetermined value in the electric heating mode. ` -In the conventional combination microwave and electric oven, a~heater means is disposed between a stainless steel turn-table and a bottom wall of an oven cavity. The conventional combinatlon microwave and electric oven such as disclosed in the above~mentioned U.S. Patent NO. 3,172,987 is very large and, therefore, a suf~icient space is provided between the stainless steel turntable and the heater means~
However! when a compact si~e combination microwave and electric oven is desired to be fabricated, the distance between the twrntable and the heater means is unavoidably reduced. When ~ the turntable is made of stainless steel, uniform cooking can not -~ be achieved in the electric cooking mode, because the stainless steel turntable does not have a uniform surface temperature when ~he heater means is close to the turntable.
Moreovar, there is a possibility of sparks being gener-ated by the stainless steel t~rntable when microwaves of a high frequency, ~or example, 2450MHZ, are introduced into the oven cavity~
' , ~ ~ I
~997~
Accord,ing to the present invention there is provided a combination microwave and electric oven comprising an oven cavity, microwave generation means for microwave cooking pur-poses, a turntable disposed in a lower seclion of the oven cavity, and a heater means disposed be~ween the turntable and a bottom wall of the oven cavity for electric cooking purposes, wherein the turntable is a metallic turntable coated with heat resistant non-metallic material to prevent the occurence of sparks when the turntable is rotated during microwave cooking operations and to ensure the even distribution of heat within the turntable during electric cooking operation.
According to the present invention, there is also provided a turntable for use in a combination microwave and electric oven including an oven cavity, microwave generation means for microwave cooking purposes and a heater means disposed between the turntable and a bottom wall of the oven cavity for electric cooking purposes, the turntable being disposed in a lower section of the oven cavity and comprising: a metal ,;
body of a high thermal conductivity for reflecting microwaves ~ '-and transmitting heat energy; and a heat resistant non-metallic materlal layer formed on the metal body for preventing an occurrence of sparks during microwave cooking and for uniformly distributing the heat energy when the heater means is energi~ed.
' ~ , ~ ' , `;
:~99~
Such an oven can be of a compact size and yet can achieve stable and uniform cooking in both microwave cooking and elactric heating cooking modes.
The heat resistant non-metallic coating on the metal turntable, which may be an enamel, functions to render more uniform the surface temperature of the turntable in the electric heating cooking mode, and to prevent the occurrence of sparks in the microwave cooking mode. In a preferred form, openings are formed in the turntable to stlr the microwave energy in the microwave cooking mode during rotation of the turntable.
The present invention will be more fully understood from the detailed description given below by way of example of preferred embodiments thereoE and with reference to the accom- ~ ;
panying drawings, which are given by way of illustration only and are not limita~ive of the present inven-tion, in which:
Figure 1 is a sectional view of a combination micro-wave and electric oven including an embodiment of an enameled metal turntable;
Figure 2 is a sectional view of the enameled metal turntable employed within the oven of Figure l;
Figure 3 is a plan view showing the enameled metal turntable of Figure 2 and showing in dotted lines a coupler for driving the turntable;
Figure 4 is a perspective view of the coupler shown in Figure 3;
.
- 2a -,, ~9~
Figure 5 is a plan view oE another embodiment of an enameled metal turn-table;
Figure 6 is a sectional view of the enameled turn-table as seen at VI-VI o~ Figure 5.
Figure 1 shows a combination mi.crowave and electric oven 10 which mainly comprises an oven wall 12 defining an oven cavity, an enameled metal turntable 14 for supportin~ a foods-tuff mounted thereon, and a sheath heater 16 disposed between the turntable 14 and the bottom wall o~ the oven cavity in a ~ashion -to surround a coupler 30 described below.
An upper heater unit 18 compri.ses a sheath heater 180 and a reflec-tion plate 182. The upper heater unit 18 and -the sheath heater ].6 function, in combination, to heat the oven in an electric heating cooking mode. A hea-t insulating wall or an athermanous wall 20 made of, for example, glass wool, asbestos or calcium silicate is provided in such a manner as to surround ;' the oven wall 12, whereby -the oven cavity is readily maintained ~ .
: at a high temperature in the electric heating cooking mode.
l~icrowave energy genera-ted from a magnetron 22 is intro-~; 20 duced into the oven cavity through a waveguide 24 for performing ; microwave cooking~ A power supply unit 25 is disposed outside the oven cavity.
, The enameled metal turntable 14 is driven to rotate in :~
both the microwave cooking mode and the electric hea-ting cooking mode through the use of a turntable motor 26, a drive mechanism ~! 28, and the coupler 30.
,1 Figure 2 shows a sectional view of the enameled metal -turntable 14, which mainly comprises a steel plate 140 coated -~
with enamel 142. Coupling projec-tions 144 are formed on -the bottom 1~99~
surface of the enameled metal tuxntable 14. I'he enameled metal turntable 14 is removably engaged with the coupler 30 through the use of the coupling projections 144. The thickness of the enamel 1~2 is preferably in the range from 0.1 through O.5 mm.
Figure 3 shows the enameled metal turntable 14 engaged with the coupler 30. Like elements corresponding to those of Figures 1 and 2 are indicated by like numerals.
The enameled metal turntable 14 i9 driven to rotate about the center thereo~, and supportiny roll~rs 3~ are rotatably fixed to the bottom wall of the oven cavity at desired positions to ensure stable rotation of the enameled metal turntable 14.
- Figure 4 show~ the coupler 30, which is made of heat-resisting plastics and has projections 3QO which are engaged with the coupling pro~ections 144 for rotating the enameled metal ~-~ turntable 14.
-~ Figures 5 and 6 show another embodiment of the enameled metal turntable. Like elements corresponding to those of Figures
2 through 4 are indicated by like numerals. As shown in Figures 5 and 6, openings 146 are fo~med in the enameled metal turntable ~ ~0 14 ~or stirring the microwaves introduced into the oven cavity during the microwave cooking modes as enameled metal turntable 14 rotates.
The invention being thus described, it will be obvious to those skilled in the art that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifi-cations are intended to be included within the scope of the following claims.
. ~ ,
The invention being thus described, it will be obvious to those skilled in the art that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifi-cations are intended to be included within the scope of the following claims.
. ~ ,
Claims (17)
1. A combination microwave and electric oven compris-ing:
an oven cavity, microwave generation means for microwave cooking purposes, a turntable disposed in a lower section of said oven cavity, and a heater means disposed between said turntable and a bottom wall of said oven cavity for electric cooking purposes, wherein said turntable is a metallic turntable coated with heat resistant non-metallic material to prevent the occurence of sparks when said turntable is rotated during microwave cooking operations and to ensure the even distribution of heat within said turntable during electric cooking operations.
an oven cavity, microwave generation means for microwave cooking purposes, a turntable disposed in a lower section of said oven cavity, and a heater means disposed between said turntable and a bottom wall of said oven cavity for electric cooking purposes, wherein said turntable is a metallic turntable coated with heat resistant non-metallic material to prevent the occurence of sparks when said turntable is rotated during microwave cooking operations and to ensure the even distribution of heat within said turntable during electric cooking operations.
2. The oven as claimed in claim 1, wherein said heat resistant non-metallic material is an enamel.
3. An oven as claimed in claim 2, wherein the thickness of said enamel is in the range from 0.1 through 0.5 mm.
4. An oven as claimed in claim 2 or 3, wherein openings are provided in the turntable.
5. An oven as claimed in claim 1 and further comprising a turntable motor and a coupler arranged to be rotated by the turntable motor, the coupler having first projections formed thereon and the turntable having second projections formed thereon near the central portion of the bottom surface of the turntable for removably engaging said first projections to transmit rotation of said coupler to the turntable.
6. An oven as claimed in claim 5, wherein said heater means is close to the bottom surface of the turntable and is dis-posed in a fashion to surround said coupler.
7. An oven as claimed in claim 5 or 6, wherein said coupler is made of heat-resisting plastics.
8. A combination microwave and electric oven comprising:
an oven cavity;
a microwave generation means for microwave cooking purposes;
a turntable disposed in a lower section of said oven cavity; and a heat means disposed between said turntable and a bottom wall of said oven cavity for electric cooking purposes;
said turntable comprises a metal turntable coated with a heat-resistant non-metallic material for preventing an occurrence of sparks while said turntable is driven to rotate during microwave cooking, and for ensuring uniform heating during electric cooking;
said oven cavity being insulated on at least a portion of an outer surface thereof to maintain said oven cavity at an elevated temperature during electric cooking.
an oven cavity;
a microwave generation means for microwave cooking purposes;
a turntable disposed in a lower section of said oven cavity; and a heat means disposed between said turntable and a bottom wall of said oven cavity for electric cooking purposes;
said turntable comprises a metal turntable coated with a heat-resistant non-metallic material for preventing an occurrence of sparks while said turntable is driven to rotate during microwave cooking, and for ensuring uniform heating during electric cooking;
said oven cavity being insulated on at least a portion of an outer surface thereof to maintain said oven cavity at an elevated temperature during electric cooking.
9. The combination microwave oven and electric oven of claim 8, wherein the heat resistant non-metallic material is an enamel having a thickness of 0.1 to 0.5 mm.
10. A turntable for use in a combination microwave and electric oven including an oven cavity, microwave generation means for microwave cooking purposes and a heater means disposed between said turntable and a bottom wall of said oven cavity for electric cooking purposes, said turntable being disposed in a lower section of said oven cavity and comprising:
a metal body of a high thermal conductivity for reflecting microwaves and transmitting heat energy; and a heat resistant non-metallic material layer formed on said metal body for preventing an occurrence of sparks during microwave cooking and for uniformly distributing the heat energy when the heater means is energized.
a metal body of a high thermal conductivity for reflecting microwaves and transmitting heat energy; and a heat resistant non-metallic material layer formed on said metal body for preventing an occurrence of sparks during microwave cooking and for uniformly distributing the heat energy when the heater means is energized.
11. A turntable according to claim 10, wherein the heat resistant non-metallic material layer is an enamel having a thickness of 0.1 through 0.5 mm.
12. A turntable according to claim 10, wherein openings are formed in the turntable metal body and the heat resistant non-metallic layer.
13. A combination microwave and electric oven comprising:
an oven cavity;
a microwave generation means for microwave cooking purposes;
a coupler projecting upwardly from a bottom wall of said oven cavity;
a metal turntable disposed at the lower section of said oven cavity including coupling projections extending down-wardly therefrom to mate with said coupler, an enamel material having a thickness of 0.1 through 0.5 mm formed on said turntable and said coupling projections for preventing an occurrence of sparks while said turntable is driven to rotate during microwave cooking, and for ensuring uniform heating during electric cooking;
and a heater means disposed between said turntable and the bottom wall of said oven cavity for electric cooking purposes.
an oven cavity;
a microwave generation means for microwave cooking purposes;
a coupler projecting upwardly from a bottom wall of said oven cavity;
a metal turntable disposed at the lower section of said oven cavity including coupling projections extending down-wardly therefrom to mate with said coupler, an enamel material having a thickness of 0.1 through 0.5 mm formed on said turntable and said coupling projections for preventing an occurrence of sparks while said turntable is driven to rotate during microwave cooking, and for ensuring uniform heating during electric cooking;
and a heater means disposed between said turntable and the bottom wall of said oven cavity for electric cooking purposes.
14. A combination microwave and electric oven accord-ing to claim 13, wherein openings are formed in the metal turn-table and the enamel material.
15. A turntable for use in a combination microwave and electric oven including an oven cavity, a microwave generation means for microwave cooking purposes and a heater means disposed between said turntable and a bottom wall of said oven cavity for electric cooking purposes, said turntable being disposed in a lower section of said oven cavity, comprising:
a metal body of a high thermal conductivity for re-flecting microwaves and transmitting heat energy, said metal body including coupling projections extending downwardly there-from; and an enamel material layer having a thickness of 0.1 through 0.5 mm formed on said metal body and said coupling pro-jections for preventing an occurrence of sparks during microwave cooking and for uniformly distributing the heat energy when the heater means is energized.
a metal body of a high thermal conductivity for re-flecting microwaves and transmitting heat energy, said metal body including coupling projections extending downwardly there-from; and an enamel material layer having a thickness of 0.1 through 0.5 mm formed on said metal body and said coupling pro-jections for preventing an occurrence of sparks during microwave cooking and for uniformly distributing the heat energy when the heater means is energized.
16. A turntable according to claim 15, wherein open-ings are formed in the turntable metal body and said layer of enamel material.
17. A combination microwave and electric oven com-prising:
an oven cavity;
a microwave generation means for microwave cooking purposes;
a turntable disposed in a lower section of said oven cavity;
a heater means disposed between said turntable and a bottom wall of said oven cavity for electric cooking purposes;
said turntable comprises a metal turntable coated with an enamel material for preventing an occurrence of sparks while said turntable is driven to rotate during microwave cooking) and for ensuring uniform heating during electric cooking; and supporting rollers operatively disposed adjacent a bottom wall of said oven cavity to ensure stable rotation of the enameled metal turntable.
an oven cavity;
a microwave generation means for microwave cooking purposes;
a turntable disposed in a lower section of said oven cavity;
a heater means disposed between said turntable and a bottom wall of said oven cavity for electric cooking purposes;
said turntable comprises a metal turntable coated with an enamel material for preventing an occurrence of sparks while said turntable is driven to rotate during microwave cooking) and for ensuring uniform heating during electric cooking; and supporting rollers operatively disposed adjacent a bottom wall of said oven cavity to ensure stable rotation of the enameled metal turntable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA286,731A CA1099791A (en) | 1977-09-14 | 1977-09-14 | Enameled metal turntable in a combination microwave and electric oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA286,731A CA1099791A (en) | 1977-09-14 | 1977-09-14 | Enameled metal turntable in a combination microwave and electric oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1099791A true CA1099791A (en) | 1981-04-21 |
Family
ID=4109529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA286,731A Expired CA1099791A (en) | 1977-09-14 | 1977-09-14 | Enameled metal turntable in a combination microwave and electric oven |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1099791A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108800233A (en) * | 2018-06-23 | 2018-11-13 | 四川大学 | A kind of pallet that micro-wave oven heating uniformity can be improved |
-
1977
- 1977-09-14 CA CA286,731A patent/CA1099791A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108800233A (en) * | 2018-06-23 | 2018-11-13 | 四川大学 | A kind of pallet that micro-wave oven heating uniformity can be improved |
| CN108800233B (en) * | 2018-06-23 | 2024-03-15 | 四川大学 | Tray capable of improving heating uniformity of microwave oven |
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Legal Events
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| MKEX | Expiry |