Heating device for a hob, and hob with such a heating device

Patent metadata

Field	Value
Publication number	US-12372248-B2
Application number	US-202217822179-A
Country	US
Kind code	B2
Filing date	Aug 25, 2022
Priority date	Sep 20, 2021
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A heating device for a hob has a flat carrier having a heating conductor side with heating conductors thereon and a switching device, the switching device having a movable switching contact and a mating contact associated therewith. The switching device has a switching arm movable in itself, said switching arm carries the switching contact and is electrically connected to an electric arm connecting means. The switching arm is fastened on the carrier and is formed from a bimetal strip. The mating contact is electrically connected to an electric mating connection means and fastened on the carrier. Switching arm, switching contact and mating contact are designed and arranged such that when a pre-defined switching temperature is exceeded, the switching contact and the mating contact are brought together, triggering a switching operation as a hot indicator for the hob, by the movement of the switching arm due to increasing heat.

First claim

The invention claimed is:

1. Heating device for a hob, said heating device having:
a flat/planar carrier having a heating conductor side and an opposite rear side,
at least one heating conductor on said heating conductor side, and
a switching device having a movable switching contact and a mating contact associated with said switching contact,
wherein:
said switching device has a switching arm movable/moving in itself,
said switching arm carries said switching contact and is connected electrically to an electric arm connecting means,
said switching contact is arranged on a free end of said switching arm,
said switching arm is fastened on said carrier,
said mating contact is electrically connected to an electric mating connection means,
said switching arm is formed from a bimetal strip,
said switching arm rests directly on said carrier and is fastened to said carrier together with said arm connecting means placed thereon, and
said switching arm, said switching contact and said mating contact are designed and arranged such that when a pre-defined switching temperature is exceeded, said switching contact and said mating contact are either separated or brought together, triggering a switching operation, by a movement of said switching arm due to increasing heat.

2. Heating device according to claim 1 , wherein said switching arm is a bimetal strip and consists of straight sections and of sections angled relative to each other by a maximum of 45° or are correspondingly curved by maximum 45°.

3. Heating device according to claim 1 , wherein said switching arm is a bimetal strip and consists of straight sections and/or of sections angled between 15° and 90° or are correspondingly curved, said switching arm consisting of three sections, namely a fastening section for fastening onto said heating device, a central section and a switching contact section adjoining said central section and carrying said switching contact.

4. Heating device according to claim 2 , wherein said switching arm is designed without snap function and wherein said switching arm consists of two or three straight sections connected to one another at an angle.

5. Heating device according to claim 3 , wherein said fastening section and the switching contact section extend parallel to one another and are two times to ten times as long as said central section.

6. Heating device according to claim 1 , wherein said switching arm has a fastening section, wherein a length of a remaining switching arm is movable and has said switching contact at its free end area.

7. Heating device according to claim 2 , wherein the switching arm has a central section angled in itself, such that two sections of said central section are angled at an angle of between 1° and 20° to each other.

8. Heating device according to claim 1 , wherein said switching arm is a bimetal strip and consists of straight sections and of sections angled between 15° and 90° or are correspondingly curved, said switching arm consisting of three sections, namely a fastening section for fastening onto said heating device, a central section and a switching contact section adjoining said central section and carrying said switching contact, and wherein is said switching arm is fastened with the fastening section.

9. Heating device according to claim 7 , wherein a positive connection to said carrier or to said electric arm connecting means is provided at said fastening section, a retaining projection and a retaining recess being provided for said positive connection.

10. Heating device according to claim 9 , wherein said retaining projection is provided at said fastening section, said retaining recess being provided on said arm connecting means.

11. Heating device according to claim 1 , wherein said switching arm is in strip form or has an elongated rectangular shape and its length is at least two times greater than its width.

12. Heating device according to claim 1 , wherein said mating contact is arranged fixed and immovable on said heating device.

13. Heating device according to claim 12 , wherein said mating contact together with said mating connection means is fastened onto said carrier, said mating contact being a part of a rivet for riveting said mating connection means to said carrier or being a part of said mating connection means itself.

14. Heating device according to claim 1 , wherein said mating contact is arranged movably/moving in itself on said carrier, said mating contact arm being fastened on said carrier and designed so resilient that as a force increases with which said switching arm presses said switching contact against said mating contact with increasing heat, said mating contact arm yields in said direction and said mating contact moves in a direction towards said carrier.

15. Heating device according to claim 1 , wherein said carrier is electrically insulated or has electrically insulating material, wherein said carrier consists of at least 90% of mica.

16. Heating device according to claim 1 , wherein said at least one heating conductor is attached permanently and irremovably on said carrier, said heating conductor having two ends, each of said two ends leading to a corresponding one of two contact fields attached to said carrier, said switching device being connected to said two contact fields, said two contact fields having a distance to one another of between 1 cm and 10 cm, said mating contact and said switching arm with said switching contact being electrically connected to one of said two contact fields.

17. Heating device according to claim 1 , wherein said switching device is arranged above a heating area covered by said at least one heating conductor and extends directly over at least one said heating conductor or over two said heating conductors.

18. Heating device according to claim 17 , wherein said switching device is arranged between an outer rim of said carrier and a central area of said carrier.

19. Heating device according to claim 1 , wherein said switching device is arranged outside a heating area of said carrier covered by said at least one heating conductor.

20. Heating device according to claim 1 , wherein said switching contact has a projecting edge in order to form a linear contact when it contacts a surface or said mating contact.

21. Hob with a heating device according to claim 1 , said hob having a hob plate with an upper side and an underside and said heating device being arranged with a rear side towards said underside of said hob plate, said hob having a hot indication device with a lamp, said lamp being switchable on and off by said switching device and being connected to said switching device to do so.

22. Hob according to claim 21 , wherein said heating device is in direct contact with said underside of said hob plate.

Assignees

• Ego Elektro Geraetebau Gmbh

Inventors

• Mandl Matthias
• Roth Martin
• Schmidt Kay

Classifications

• H05B1/0213

  using bimetallic elements · CPC title

• F24C7/083

  on tops, hot plates · CPC title

• F24C15/106

  electric circuits · CPC title

• F24C15/105

  Constructive details concerning the regulation of the temperature · CPC title

• F24C7/087 Primary

  of electric circuits regulating heat · CPC title