Heat conductor for a cooking plate

Details Heat conductor for a cooking plate Heat conductor for a cooking plate

1999-03-19

2000-10-24

Paik, Sang

Electric heating

Heating devices

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

219541, H05B 368, H05B 308

Patent

active

061370908

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention concerns a heating conductor which can be fitted in a geometrical pattern into a radiant heating body of a cooking hob.
2. Description of the Prior Art
A heating conductor comprising a flat strip is described in DE 42 29 375 A1 and EP 0 585 832 A1. The desired spiral-shaped geometrical pattern is formed by the flat strip being laid in suitable turns on an insulating bottom of the radiant heating body. In that arrangement the large surfaces of adjacent flat strip portions face towards each other. Only the narrow edges of the flat strip face towards the cooking hob or surface.
In accordance with DE 38 00 676 A1 a flat strip heating conductor of that kind is laid in a star-shaped geometrical pattern.
Flat strip heating conductors of that kind are complicated and expensive to lay and to fix to the insulating bottom. Their narrow edges which are towards the cooking surface or hob cover only a small part of the cooking hob.
EP 0 175 662 B1 describes a heating conductor whose geometrical pattern is formed by stamping out of a foil laminate including a metal foil. That heating conductor is only suitable for temperatures of up to a maximum of 400.degree. C. and thus cannot be used for a radiant heating body. Flexibility of the heating conductor is desirable in this case because it is to be fitted into vehicle seats. Disposed between the current connections is an auxiliary web which is to be cut out after the electrical connections have been made.


SUMMARY OF THE INVENTION

The object of the present invention is to propose a heating conductor of the kind set forth in the opening part of this specification, which can be easily mounted in radiant heating bodies and which has good radiation properties.
In accordance with the invention the foregoing object is attained by a heating conductor which can be fitted in a geometrical pattern into a radiant heating body of a cooking hob.
Because of the thinness of the metal foil, for example 0.05 mm to 0.1 mm, and the size of the diameter of the geometrical pattern, for example 10 cm to 30 cm, a heating conductor of that kind is a delicate structure which has little stability in respect of shape and which in itself bends easily and in which the heating limbs bend easily. That increases difficulties in regard to handleability upon transportation and assembly.
In order to stabilise the heating conductor, stabilisation limbs are left in the operation of severing the heating conductor out of the metal foil, the stabilisation limbs resulting in a certain degree of stiffening of the structure of the heating conductor so that transportation and assembly thereof is less susceptible to trouble. However the stabilisation limbs necessarily form in the heating conductor undesired electrical short-circuits between the heating limbs. They must be removed prior to operation. That is effected by applying an electrical voltage which results, in the stabilisation limbs, in a current which heats them up in such a way that they burn out. When that happens the heating limbs are not damaged as the width thereof is substantially greater than that of the stabilisation limbs. The thickness of the stabilisation limbs and the heating limbs is the same because they come from the same metal foil.
Preferably each two adjacent heating limbs are connected to holding tongues or connecting limbs and the stabilisation limbs are provided between adjacent holding tongues or connecting limbs. In order to provide a smooth external contour for the geometrical pattern, the stabilisation limbs extend on the outside at the geometrical pattern.


BRIEF DESCRIPTION OF THE DRAWINGS

Further advantageous configurations of the invention are set forth in the following description of embodiments given by way of example. In the drawing:
FIG. 1 shows a heating conductor with parallel heating limbs in its two halves,
FIG. 2 shows a heating conductor which is composed of six segments,
FIG. 3 shows a heating conductor involving a star-shaped pattern,
FIG. 4 shows

REFERENCES:
patent: 2399753 (1946-05-01), McLarn
patent: 3495328 (1970-02-01), Ziver
patent: 4286377 (1981-09-01), Hurko et al.
patent: 4500865 (1985-02-01), Tanaka et al.
patent: 4859835 (1989-08-01), Balderson

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