Radiant heating element for a cooking area

Details Radiant heating element for a cooking area Radiant heating element for a cooking area

1999-06-04

2000-09-19

Paik, Sang

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

21944811, H05B 368

Patent

active

061215872

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention concerns a radiant heating body for a cooking location, in particular in relation to a glass ceramic plate, wherein an insulating bottom having an insulating annular rim portion is provided in a pot member and a heating element is arranged in an air space above the insulating bottom and a safety temperature limiter is provided on the pot member.
2. Discussion of the Prior Art
Radiant heating bodies of that kind are commercially known and are described for example in DE 35 36 981 C2. The safety temperature limiter serves to protect the glass ceramic plate from overheating. The safety temperature limiter comprises, in a tube, an expansion bar which extends in the air space above the heating element. An expansion bar regulator of that kind is a complicated and thus expensive component. Furthermore arranging the expansion bar in the air space involves a correspondingly large structural height in respect of the radiant heating body.
A glass ceramic cooking zone having an energy regulator and a bimetal regulator which is disposed laterally on the radiant heating body is described in HEA-Bilderdienst 6.2, August 1983, pages 17 and 18. The bimetal regulator is closed to start the cooking procedure. The bimetal regulator-opens at a cooking zone temperature of about 125.degree. C. In this case also safety temperature limitation is effected by means of the expansion bar sensor of the energy regulator.


SUMMARY OF THE INVENTION

The object of the present invention is to propose a radiant heating body of the kind set forth in the opening part of this specification, in which an expansion bar is not required, while affording a low degree of switching hysteresis in respect of safety temperature limitation.
In accordance with the invention the foregoing object is attained in that as a safety temperature limiter there is provided a bimetal switch component having a housing or a base plate which is fixed to the pot member. A bimetal element is disposed in the housing or on the base plate at a side towards the air space. Formed in the annular rim portion is a through-opening through which the bimetal element is directly or indirectly thermally coupled to the air space.
The bimetal switch component is an inexpensive component and results, in a simple manner, in a sufficiently low level of switching hysteresis as it reacts quickly to the heat radiation from the heating element. Severe overshooting of the temperature beyond a limit value is also avoided as a result. A further advantage of the arrangement of the bimetal switch component is that there are various simple possible ways of setting or adjusting the response temperature of the bimetal member.
A structural advantage is that the bimetal switch component has practically no influence on the structural height of the radiant heating body because it does not extend in the air space between the insulating bottom and the glass ceramic plate.
Preferably the temperature at which the bimetal element responds is greater than 300.degree. C. That substantially suppresses the influences of the ambient temperature of the radiant heating body.
In a preferred development of the invention the function of an adjustable energy regulator is integrated into the bimetal switch component. For that purpose, connected to the bimetal element or a switch contact which is actuable thereby is an adjusting member with which the response temperature of the bimetal element is adjustable.


BRIEF DESCRIPTION OF THE DRAWINGS

Further advantageous configurations of the invention are set forth in the appendant claims and the following description of embodiments by way of example. In the drawing:
FIG. 1 is a plan view of part of a radiant heating body with a bimetal switch component in a first embodiment, with an annular member which is partially broken away in the drawing,
FIG. 2 is a view in section taken along line II--II in FIG. 1,
FIG. 3 is a partly sectional view of the bimetal switch component,
FIG. 4 is a view of the bimetal switch

REFERENCES:
patent: 3622155 (1971-11-01), Komazaki et al.
patent: 4388520 (1983-06-01), McWilliams
patent: 4810857 (1989-03-01), Goessler
HEA Bilderdienst 6.2, Aug. 1983; pp. 17 and 18.

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