WO2012055709A2

WO2012055709A2 - Pot support and gas cooking point

Info

Publication number: WO2012055709A2
Application number: PCT/EP2011/067969
Authority: WO
Inventors: Karsten Willmann
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2010-10-27
Filing date: 2011-10-14
Publication date: 2012-05-03
Also published as: EP2633239B1; EP2633239A2; WO2012055709A3; RU2013122752A; DE102010042988A1; CN103154617A; RU2551603C2

Abstract

A pot support (1) for a gas burner (6) comprises a thermochromic material in at least one region (5) of the pot support (1). A gas cooking point (10) is equipped with at least one gas burner (6) and a corresponding pot support (1).

Description

Pot carrier and gas hob

The present invention relates to a pot carrier for a gas burner and a gas hob. Pot supports are arranged around a gas burner to create a support surface for food containers.

Known pot supports are generally designed as a peripheral frame with inwardly projecting fingers, the fingers create the support surface.

When operating the gas hob, the gas flames heat both the cookware and the pot carrier. Before after a cooking process, the corresponding gas stove and the pot carrier can be cleaned, the operator must wait until the pot carrier has cooled, so as not to injure themselves. In known pot carriers, the operator is dependent on their experience to estimate whether the pot carrier still has a temperature that can lead to burns when touching, for example, with unprotected hands.

Against this background, it is an object of the present invention to provide an improved pot carrier for a gas hob. Accordingly, a pot carrier for a gas burner is proposed in which a thermochromic material is arranged in at least one region of the pot carrier.

Thermochromic materials change their external appearance depending on the temperature. By a color change from low temperature to high temperature, the operator of a gas hob, which is equipped with a corresponding pot carrier, be displayed whether the pot carrier still has a temperature that is too high for touching, for example, with bare hands. In this respect, the thermochromic material can be selected such that it appears in a first color at a temperature of the pot carrier, which is higher than a threshold temperature, and in a second color at a pot carrier temperature which is below the threshold temperature. For example, the threshold temperature is selected as a temperature at which no combustion or injury occurs the human skin on contact more occurs. There are also multi-level color transitions possible.

In one embodiment of the pot carrier, the thermochromic material is arranged in a recess of the pot carrier. The recess may be, for example, a bore or a remote area of a pot carrier strip. If the thermochromic material is introduced, for example in the manner of a paint or a plastic in a recess, an aesthetically particularly favorable overall impression is achieved. It is also conceivable that the thermochromic material is attached as a removable display element in or on the pot carrier. In this respect, the thermochromic material can be mounted as an indicator on existing pot carrier or retrofitted to indicate the operator too high a temperature of the pot carrier. For example, in one embodiment, the display element is implemented as a clip. A clip is then clipped on, for example, a finger or a bar of the pot carrier.

In a preferred embodiment of the pot carrier, the region with the thermochromic material is arranged, when the pot carrier is used as intended, on one side of the pot carrier, which is remote from the gas burner.

If the area or the display area or the display element is attached or arranged by the side facing away from the gas burner and, in particular, the gas burner flames, it is in the heat shadow of the gas burner during operation. In general, these are the points on the pot carrier, which are touched by the operator, for example, to initiate a cleaning process. It is also known as a heat shadow, which is usually the coldest point of the pot carrier even during operation of the gas burner.

In yet another embodiment of the pot carrier, the thermochromic material is formed as a thermosetting plastic material. Thermosets are usually cross-linked polymers. Unlike thermoplastics, they are not meltable or deformable. Thermochromic thermosets are known in which thermochromic pigments are incorporated as thermochromic materials. In this respect, in the production of the thermoset, which is used for example as a display element or is embedded in a recess of the pot carrier, already the Pigent be added with themochromic properties. Conventional thermochromic pigments can be prepared with single and multi-stage color circuits, in particular in temperature ranges between 0 ° C and 100 ° C.

Preferably, the thermochromic material has a color change in a temperature range between 40 ° C and 70 ° C. However, other temperature ranges can be used. In general, temperatures between 40 ° C and 60 ° C, and in particular between 40 ° C and 45 ° C are sufficiently safe so that no combustion takes place upon contact with a material of the corresponding temperature. The thermochromic material preferably has a temperature resistance up to 450 ° C. In a further embodiment, the thermochromic material has a temperature resistance up to 400 ° C. The temperatures mentioned correspond approximately to the temperatures caused by gas burners on pans. In a further development, the pot carrier may comprise a pot carrier frame as a base of the pot carrier in or on a cooktop and further comprise a plurality of inwardly projecting fingers of the frame. The tops of the fingers form a support surface for a food container. Preferably, the region (with the thermochromic material) is disposed on a vertical portion of one of the fingers. It is thereby achieved that the sections which are generally used for removing or removing the pot carrier from a gas hob or a gas cooktop are characterized with regard to their temperature properties by the thermochromic material. The operator, upon color change towards the temperature indicating a safe color temperature range, recognizes that removal is safe at the location.

Preferably, the area is disposed on an outer side of one of the fingers. Furthermore, a gas hob is proposed with at least one gas burner and a pot carrier as described above.

In one embodiment of the gas hob, the gas burner and the pan support are arranged on a cooking surface or in a cooktop. The pot supports are arranged such that the area is visible from an operating position of the operator of the gas hob. As a result, when using the gas hob, the operator can always determine whether the pan support has a temperature that is too high to handle the pan support.

In the proposed measures for displaying the temperature of a pot carrier through areas with thermochromic materials or a display element no additional energy is needed. There are also no electrical or other sensors necessary to provide electrical indicators for the temperature of the pot carrier in gas stoves, which usually have no power supply. Furthermore, the color change is reversible, so that the display of the temperature of the pot carrier can be made again and again.

In addition, a gas stove with one or more gas hobs, which includes the above-described pot carrier is proposed. The gas stove can be designed as a stand-alone unit with a base cabinet or as a built-in gas hob.

Further possible implementations of the invention also include not explicitly mentioned combinations of features described above or below with regard to the exemplary embodiments. The expert will also add individual aspects as improvements or additions to the respective basic shape of the pot carrier or the cooking area.

Further advantageous embodiments and aspects of the invention are the subject of the dependent claims and the embodiments of the invention described below. Furthermore, the invention will be explained in more detail by means of preferred embodiments with reference to the attached figures. It shows:

Figure 1 shows an embodiment of a pot carrier in a perspective view;

Figure 2 shows an embodiment of a gas hob with a gas burner in a perspective view;

Figure 3 shows a second embodiment of a pot carrier in a perspective view;

and FIG. 4 shows a third embodiment of a pot carrier in a perspective view.

In the figures, identical or functionally identical elements are provided with the same reference numerals, unless stated otherwise. 1 shows a perspective view of an embodiment of a pot carrier. The pot carrier 1 in this case comprises a circumferential pot carrier frame 2, which forms a base SF, with which the pot carrier 1 is usually placed on a gas hob, a gas stove or a gas hob. From the frame 2, fingers 3, each comprising a vertical section 4, protrude into the interior of the frame 2. The tops of the fingers 3 provide a support surface AF for cookware.

FIG. 1 also shows a region 5 of the pot carrier 1 in which a thermochromic material is provided. The thermochromic material region 5 is provided on the outside of one of the vertical portions 4 of one of the fingers 3. During operation of a gas burner in the interior of the pot carrier 1, the region 5 with the thermochromic material lies in the heat shadow. Usually, the pot carrier is also touched at these points by operators.

The thermochromic material changes its color reversibly as a function of the temperature. The temperature range is therefore selected substantially between room temperature (about 20 ° C - 30 ° C) and 40 ° C to 70 ° C. In this temperature window, for example, provided as a thermochromic plastic region 5 changes its color. For example, a color change from blue to red through the Choice of material mixtures of thermochromic pigments can be adjusted in the plastic. For example, a signal color red is selected for high temperatures, for example above 50 ° C, to indicate to the user that the pan support should not be touched unprotected. Especially with gas hobs with gas burners, this heat indicator on the pot carrier is advantageous because the pot carrier can become dirty during the cooking process and must be cleaned frequently. In contrast to electric stoves or electric hobs with smooth glass ceramic surfaces of electric stoves, the elements of gas cookers can not be cleaned so easily. For gas cookers usually removal of the pot carrier for the cleaning process is necessary. To indicate to the user potentially dangerously heated pan supports, for example made of metal, the area 5 is provided with thermochromic material. This reduces the risk of burning or being injured by hot pot carriers. As materials for thermochromic pigments or thermochromic materials are particularly suitable thermosetting plastics that are thermally stable. In the case of thermosetting plastics, crosslinked polymers are generally used and mixed with specially developed thermochromic pigments. There are multi-level color changes that are reversible, conceivable. The thermochromic region 5, as shown in FIG. 1, may be designed to be detachable as a display element or may also be provided in a recess in the pot carrier.

2 shows an embodiment of a gas hob with a gas burner and a pot carrier in a perspective view. Essentially, the pot carrier 1, which is arranged around a gas burner 6, comprises the same elements as has been explained with reference to FIG. 2A shows the gas hob 10 with a burning gas burner 6. The gas burner 6 has a gas burner head 7 with outlet openings for gas, which burns and forms a ring of gas burner flames 8. The gas flames 8 radiate heat and heat the pot support 1 in particular on the pot carrier fingers 3. In the illustration of FIG. 2A, a region of thermochromic material 5 is provided on a vertical section 4 of the right-hand finger 3 (in the orientation of FIG. 2A). The thermochromic material, which is shown hatched here, indicates with its color, that a heating of the Pot carrier is done and a touch is dangerous, for example, with a hand or a finger. The hatching signal, for example, a red color, which serves as a warning.

Even when switching off the gas burner, the pot carrier remains heated for a certain time. Without a thermochromic material display element, the user might unwillingly touch and remove the pot carrier for cleaning. In the figure 2B, the gas burner 6 is indicated in the off state. However, the display element 5 or the thermochromic material is still in a state in which it indicates the temperature of the pot carrier 1 above a suitable threshold temperature. Only after the pan support 1 and in particular the vertical section 4 of the finger 3 has cooled, is a color change in the direction of an example security hinting color such as blue or green. Only then should a user with bare hands touch the pot carrier. In Figure 2C, the color change of the display element 5 is indicated, which is shown without hatching. Now it is safe for the user or the operator to remove the pot carrier 1, for example, for cleaning of the cooking area 10. FIG. 2D shows how the pot carrier, in which the thermochromic material indicates a temperature, for example below 50 ° C. or advantageously below 45 ° C., is shown.

FIG. 3 shows a second embodiment of a pot carrier. The illustration in FIG. 3 is a section of the pot carrier 1 1 with a finger 3, the vertical section 4 of which is connected to the pot carrier frame 2. In the vertical portion 4, a recess 12 is provided in the manner of a bore. The bore can be, for example, a round bore or pot bore and allows the use of a display element in the pot carrier 1 1. The bore can pierce the pot carrier 11 completely, so that for example a cylindrical pin made of thermosetting plastic with thermochromic pigments can be used as a display element. As far as the operator is concerned, a display point on the vertical section 4 of the pot carrier 11 is visible. FIG. 4 shows a third embodiment of a pot carrier. The pot carrier 13 in turn has a wedge-shaped recess on a vertical section 4 of a finger 3 in the region 15. In the recess, a correspondingly shaped plastic part 14 can be used as a display element. The display element 14 may alternatively be clipped as a clip to a vertical portion 4 of the pot carrier. Then no recess is required. With a clip, there is the advantage that even delivered and used pot carriers can be retrofitted with a display element 14 in order to increase the safety for the operator. In the figure 4 is indicated by the arrow P as the display element 14 is removable from the pot carrier.

The proposed pot carrier with an area comprising a thermochromic material, safe and reliable by a color change in a temperature window, which may be determined by the choice of material mixture, a secure temperature display for an operator achieved. Overall, especially in gas stoves, which are equipped with corresponding pot carriers, increased security achieved because the operator can recognize on the basis of the color of the pot carrier or the area with the thermochromic material on or in the pan support, whether a touch is safely possible. Gas stoves that are equipped with appropriate pot carriers are therefore particularly safe and user-friendly.

Used reference signs:

1 pot carrier

2 frames

3 fingers

4 finger section

5 area

6 gas burners

7 burner head

8 burner flames

9 operators

10 gas hob

11 pot holder

12 hole

13 pot carrier

14A indicator

14B clip

15 area

AF bearing surface

SF stand space

P removal direction

Claims

1. pot carrier (1) for a gas burner (6), characterized in that in at least one region (5) of the pot carrier (1) a thermochromic material is arranged.

2. pot carrier (1) according to claim 1, characterized in that the thermochromic material in a recess of the pot carrier (1) is arranged.

3. pot carrier (1) according to claim 1 or 2, characterized in that the

thermochromic material as a removable display element (14) in or on the pot carrier (1) is attached.

4. pot carrier (1) according to claim 3, characterized in that the display element (14 B) is designed as a clip.

5. pot carrier (11) according to any one of claims 1-4, characterized in that the thermochromic material in a bore (12) in the pot carrier (11) is fixed

6. pot carrier (1) according to any one of claims 1-5, characterized in that the region (5) is arranged at the intended use of the pot carrier (1) on one side of the pot carrier (1), which faces away from the gas burner (6) is.

7. pot carrier (1) according to any one of claims 1-6, characterized in that the thermochromic material is a thermosetting plastic material.

8. pot carrier (1) according to any one of claims 1-7, characterized in that the thermochromic material has a color change in a temperature range between 40 ° C and 70 ° C.

9. pot carrier (1) according to any one of claims 1-8, characterized in that the thermochromic material has a temperature resistance at least up to 450 ° C.

10. pot carrier (1) according to any one of claims 1-5, characterized in that the pot carrier (1) has a frame as a base (SF) of the pot carrier (1) in or on a cooktop and a plurality of inwardly projecting fingers of the frame ( 3), whose upper sides form a bearing surface (AF) for a food container.

11. pot carrier (1) according to claim 10, characterized in that the region (5) on a vertical portion (4) of the fingers (3) is arranged.

12. pot carrier (1) according to claim 10 or 1 1, characterized in that the region (5) on an outer side of one of the fingers (3) is arranged.

13. Gas cooking point (10) with at least one gas burner (6) and a pot carrier (1) according to one of claims 1 - 1 1.

14. Gas cooking point (10) according to claim 13, characterized in that the gas burner (6) and the pot carrier (1) are arranged on a cooking surface or in a cooktop and the pot carrier (1) is arranged such that the area of an operating position an operator of the gas hob (10) is visible.

15. Gas stove with at least one gas hob (10) according to claim 13 or 14.