Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
2001-08-16
2003-04-29
Paik, Sang (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C126S198000
Reexamination Certificate
active
06555794
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a stove for cooking food and like appliances with a door having a window and a temperature indicating device thereon.
2. Background Information
In general terms, a stove for cooking food comprises a stove body, with the stove body being configured with a base and the stove body further being configured with an interior chamber confined by walls comprising side walls, a front wall, and a rear wall.
An oven is disposed in the interior chamber of the stove body and the oven comprising a heating arrangement configured and disposed to provide heating to cook food in the oven. There is further provided control apparatus to control said the heating arrangement.
The oven usually comprises a door in the front wall, which door may comprise a window arrangement, with the window arrangement comprising a viewing area to view the interior of the oven.
U. S. Pat. No. 5,432,321 issued to Gerl on Jul. 11, 1995 discloses an oven which includes a normal heating device, a partial heating capacity device, a first indicator device associated with the normal heating device, a second indicator device associated with the partial heating capacity device, and a control unit. The control unit turns on a full heating capacity of the normal heating device in a preheating phase and turns on the first indicator device to indicate that the normal heating device is on. The control unit turns on the partial heating capacity device in the preheating phase and turns on the second indicator device to indicate the preheating phase. The control unit automatically switches over the normal heating device to a reduced heating capacity in a continued heating phase, when a selected command temperature is reached. The control unit turns off the partial heating capacity device and automatically turns off the second indicator device simultaneously with the switchover to the continued heating phase.
U.S. Pat. No. 5,928,540 issued to Antoine et al. on Jul. 27, 1999 refers to an oven door for closing a cooking chamber of an oven, the door being composed of: a frame on the oven; an inner wall and an outer wall both supported by the frame so that the inner wall is located between the cooking chamber and the outer wall, the inner wall and outer wall being positioned relative to one another to delimit an air space; and ventilation elements for establishing a flow of air between the inner wall and the outer wall in order to maintain the outer wall at a low temperature during a cooking operation, wherein the inner wall is made of glass, and the outer wall is removable from the frame and is made of a plastic material selected to withstand the temperatures to which it will be exposed during any cooking operation.
The window arrangement referred to above may comprise a plurality of panes, for example, a first pane and a second pane, with the second pane being disposed adjacent the first pane, and the first pane being disposed to face towards the interior of the oven upon installation in the stove.
The second pane would be disposed to face towards the exterior of the stove upon installation in the stove.
It would be advantageous, for example, for cleaning the oven to determine the interior temperature of the oven.
A temperature indicating device of the prior art is described in Federal Republic of Germany Published Patent Application No. DOS 19836732 A1 published on Feb. 24, 2000. A temperature-sensing element is attached in the vicinity of the surface of the door and, as the temperature of the door rises, indicates the elevated door temperature by changing color. One essential feature of this device is that it does not indicate the temperature of the interior of the oven, but only the temperature of the door. The element is preferably a film that is attached to the inside of the door and contains chemical substances that visibly change color as the temperature changes. Accordingly, the element must be designed so that it can survive the high temperatures to which it is exposed in ovens. A temperature-sensing element of this type is complex and expensive to manufacture.
U.S. Pat. No. 5,499,597 issued to Kronberg on Mar. 19, 1996 and entitled, “Optical temperature indicator using thermochromic semiconductors,” describes thermochromic materials to indicate temperatures, which can be used to indicate hazardous temperatures on hotplates.
In the prior art, bimetallic or electronic sensors are used as the temperature sensors to indicate the temperature of the interior of an oven. These sensors act on a display by means of a corresponding electronic system. Circuits of this type, are complex and expensive to manufacture. They also require power to operate.
International Published Application WO 97/26486 published on July 1997, entitled, “A control device for a domestic oven”; and International Published Application WO 97/34490 published on Sep. 25, 1997, entitled, “A heater unit for ovens,” describe various requirements for temperature indicators on the door of a domestic oven.
Austrian Patent No. 202,660 of Sep. 15, 1958 describes a roaster for electric ovens with a thermostatic control that is attached to the door. The controller is located between two shells of the door. A thermally conducting body transmits the heat from the inner shell of the door to a bimetallic switch. There is an indicator light that shows the status of the switch.
U.S. Pat. No. 5,589,958 issued to Lieb on Dec. 31, 1996 and entitled, “Kitchen ensemble having windows with controllable opacity,” describes a kitchen arrangement on which the front windows can be switched into a transparent or opaque status.
East German Patent No. DD 234 298 A 1 is for an adhesive film that indicates the temperature. This film is used to indicate the temperature in electric household appliances.
Japanese Published Patent Application JP 11351729 A, corresponding to U.S. Pat. No. 5,996,357 issued to Park on Dec. 7, 1999 and entitled, “System for checking an internal temperature of a refrigerator by using a thermochromic member,” describes a device to indicate the interior temperature of a cooling unit. For this purpose, the device has a thermochromic element.
OBJECT OF THE INVENTION
The object of the invention is to provide a stove and like appliance having a window with an indicator device that indicates when a specified temperature range in the interior of a heating and/or cooling device has been reached by changing color, whereby in a heating device, the temperature indicator device is not damaged by the high temperatures inside the oven.
SUMMARY OF THE INVENTION
The invention teaches that this object can be achieved by a stove for cooking food, said stove comprising: a stove body; said stove body being configured with a base; said stove body being configured with an interior confined by walls comprising side walls, a front wall, and a rear wall; an oven disposed in said interior of stove body; said oven comprising a heating arrangement configured and disposed to provide heating to cook food in said oven; control apparatus to control said heating arrangement; said oven comprising a door in said front wall; said door comprising a window arrangement, said window arrangement comprising a viewing area to view the interior of said oven; said window arrangement comprising a first pane and a second pane; said second pane being disposed adjacent said first pane; said first pane being disposed to face towards said interior of said oven upon installation in said stove; said second pane being disposed to face towards the exterior of said stove upon installation in said stove; and an indicator disposed adjacent to or in said second pane; said indicator being configured to change color upon the interior temperature of said oven reaching a predetermined temperature.
The invention teaches that this object can be accomplished, in accordance with one aspect, on a temperature indicator device of the type described above by the features comprising, in accordance with one aspect of the invention, that between two plates of the gl
Götz Bernhard
Gramlich Walter
Gros Oliver
Grützke Joachim
Leutner Kurt
Nils H. Ljungman & Associates
Paik Sang
Schott Glas
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