EP2191689B1 - Hob and method for producing a hob - Google Patents

Description

The invention relates to a hob with a cooking surface made of glass ceramic designed for positioning a preparation vessel and to a method for producing a hob.

From the DE 87 01 926 U1 is a device for control technical operation of the heating elements of cooker hobs known. The stove comprises a cooking surface with a quadrangular glass ceramic pane, as well as a display field strip, which is formed separately from the glass ceramic pane and adjoins the glass ceramic pane at its front edge. The display panel strip is transparent and can be arranged under this light emitting diodes. The glass ceramic pane and the display panel strip are surrounded by a frame, wherein the glass ceramic pane and the display zone strip can be sealed relative to the frame and against each other. The display panel strip thus extends beyond the dimensions of the glass ceramic pane. The arrangement is therefore very space-intensive.

Furthermore, from the DE 103 12 449 A1 a stove with a stove top known, which has a Herdplattenabdeckplatte glass ceramic. In addition, the stove plate comprises an insert plate, which is arranged within the hearth cover plate and is thus surrounded over its entire edge thereof. The insert plate is preferably also a glass ceramic plate. However, it may be specified with colorants, dyeing layers, coloring pigments or dyeing coatings. A gap formed between the insert plate and the hearth cover plate is covered with a decorative frame. This allows only a relatively insufficient attachment and positioning of the components to each other, and very limited display options.

In addition, from the DE 196 12 621 C2 a hob with a cooking surface made of glass or glass ceramic known. In the cooking surface at least one recessed functional zone is arranged, which may be made of glass or glass ceramic. This functional element is by means of a temperature-resistant, dense and permanently elastic Connection in a recess of the hob mounted flush with this. The compound may be formed as an elastic or rigid connection and, for example, be a silicone rubber. The functional zone can thus also be glued into the cooking surface. Below the functional zone display elements may be arranged, whereby the functional zone then serves as a display surface and is preferably formed of a transparent, non-colored glass or plastic. The arrangement of the functional zone within the cooking surface, this functional zone occupies a relatively large amount of space and therefore minimizes the possible space for other components or zones of the hob. In addition, the display capability of this functional element or the functional zone with respect to different colors of the display is severely limited. Glass ceramic hobs usually have red displays, since commercially available glass ceramics only let through light in the red spectral range. Light in the yellow spectral range is distorted to appear as orange to the viewer. All other colors are strongly attenuated or even completely absorbed, this is especially the case in the blue spectral range as well as for white light.

From the DE 38 02 406 A1 and the EP 0 593 891 A1 Hobs are known, as indicated in the preamble of claim 1.

Furthermore, from the EP 1 505 354 A1 , of the EP 1 465 460 A1 , of the WO 2008/042805 A each known a hob plate, which is transparent to light in the blue spectral range. The document DE 198 57 117 A1 relates to the formation of moldings, for example cooktops from continuously homogeneously colored glass ceramic, the hue is in the color between dark gray and light gray, with the effect of low soiling and low visibility of traces of wear, such as scratches u. ä.

The document DE 693 11 197 T2 relates to an infrared and ultraviolet radiation absorbing glass which has a neutral gray color and a sufficiently high visible light transmittance and is suitable for use in windows of buildings, automobiles and other vehicles and optionally also for furniture and cooking appliances.

It is an object of the present invention to provide a hob, which can be designed to minimize space and also allows a higher and more flexible and more realistic color representation for displaying information.

This object is achieved by a hob having the features of claim 1, and a method comprising the features of claim 14.

An inventive hob comprises a cooking surface on which one or more preparation vessels are positionable. The cooking surface is made of glass ceramic. The cooking surface comprises a peripheral cutout in the glass ceramic, in which a translucent insert is arranged, which is formed of a material different from the glass ceramic, which is transparent to light of the blue spectral range. This design of the cooking surface, a compact and very space-saving hob can be created, which also with regard to a flexibilization of the display, in particular the display option different and more colors, is improved, and beyond that also enhances the appearance of color fastness improves.

Especially with regard to the increasing number of displays and setting options which are to be presented to a user of the hob specifically and easily perceived, can be worn by this design of the hob improved account. In addition to the very general specific differentiation through several color representations of displays, moreover, the specification with colors of warning displays and the like can be individualized, whereby the perceptibility for a user can be improved. Preferably, the insert is arranged at its front edge flush with the front edge of the glass ceramic. With regard to the insertion of the insert in the cutout thus a particularly space-saving design can be created. The inserter is thus arranged completely within the dimensions of the cooking surface if the cutout were not formed, and thus the cooking surface would not dispose of this cutout. An area enlargement does not occur thereby. In addition, however, it can also be ensured that a further undesired restriction of the surface area of the cooking surface is prevented by the marginal positioning of the insert, and thus other zones need not be reduced in their dimensions. This is a significant advantage over embodiments in which functional zones are integrated into the cooking surface, that they are virtually surrounded over their entire peripheral edge of the cooking surface of glass ceramic. The insert according to the hob according to the invention is thus also optimally positioned in the hob and optimally positioned in this regard to the cooking surface.

Since the insert is permeable, in particular translucent, to light of the blue spectral range, this is therefore not a glass ceramic. According to the insert of gray glass is formed. This ensures on the one hand the transmission of light in the blue spectral range as well as the transmission of light in the red and yellow spectral range. In addition, light colors of other spectral ranges are also transmitted, so that a display area of the hob can be generated by the depositor, which a variety different color representations for different displays and also warnings possible. The individualization of the displays and also the recognizability and perceptibility of such a specific display can thereby be perceived more intuitively and more easily for the user, in particular if a plurality of such displays appear simultaneously on the hob.

Preferably, the insert is glued into the cutout of the glass ceramic. It proves particularly preferable if the insert is fastened with different adhesives in the cutout. In addition to a positionally stable arrangement thereby also the production process can be optimized and during the manufacture, the attachment of the relative positioning of the individual components to each other safely be achieved. Unwanted tolerances can be effectively prevented. Through the use of different adhesives, the different requirements during the manufacturing process can be taken into account.

Preferably, the insert is secured to the cutout with a UV (ultraviolet) adhesive and a silicone adhesive. With the UV adhesive can thus be achieved during the manufacturing process, the positional fixation of the components to each other and beyond with the silicone adhesive, the permanent connection can be ensured.

Preferably, the UV adhesive is formed selectively in the gap formed between the insert and the glass ceramic in the cutout and the silicone adhesive is continuous and thus formed as a strand. By this configuration, the amount of adhesive can be minimized or optimized. As a result of the only selective application of the UV adhesive, sufficient positioning can also be achieved and the manufacturing process can be shortened. The silicone adhesive formed as a contiguous strand can preferably achieve a complete filling of the gap in the cutout and thereby achieve an effective and lasting stable connection between the glass ceramic and the insert.

Preferably, the gap between the insert and the glass ceramic and the adhesive formed in the gap are covered on the upper side by a decorative frame.

Dirt or wear of the adhesive in the gap can be prevented. In addition, a high-quality impression can be conveyed by this configuration.

Since, in particular, the glass ceramic and the insert are coordinated with one another so that they appear to be the same material parts for a user looking at the hob, the interface between the glass ceramic and the insert can also be concealed by this decorative frame, and this overall visual impression is not falsified , Thus, there is virtually no difference between the display and / or operating region formed by the insert and the cooking surface area formed by the glass ceramic. In addition, the clear separation of display and / or operating area and cooking surface area can be generated by this area delimitation with the decorative frame. The user thus clearly sees where he may, if necessary, access the hob without burning himself. In addition, by this surface separation with the decorative frame over the gap between the insert and the glass ceramic damage to the electronics arranged under the depositor can be prevented because the user recognizes by this decorative frame the separation to the effect that he no hot pot or other preparation vessel to set it up. Not least can be prevented by this decorative frame that undesirably a preparation vessel from the cooking surface in the display and / or operating area slips.

By filling the gap between the insert and the glass ceramic with an adhesive, in particular a plurality of different adhesives, the heat conduction between the glass ceramic and the insert can thereby also be at least substantially reduced. Preferably, the adhesive is therefore also a poor heat-conducting structure.

The glass ceramic and the insert arranged in the cutout are preferably positioned relative to one another in such a way that they are spaced apart from one another and non-contact with each other and the gap has a width between 2 mm and 6 mm, in particular 4 mm. By this dimensioning and arrangement, the unwanted heat transfer from the glass ceramic or the cooking surface can be prevented on the insert.

Preferably, the decorative frame has a width between 10 mm and 20 mm, in particular 15 mm. By this dimensioning the sufficient coverage of the gap between the glass ceramic and the depositor on the one hand ensures and on the other hand ensures a sufficient mechanical symbolic separation between the cooking surface area and the display and control area, which can be detected quickly and reliably at any time.

Preferably, the decorative frame has a height between 0.5 mm and 1 mm, in particular 0.7 mm, in its partial area which covers the gap between the insert and the glass ceramic on the top. As a result, a relatively flat-building decorative frame can be made possible, which nevertheless can be made stable. In addition to a saving of material thus a weight minimization can be achieved.

Preferably, the insert has on its rear side, at least in regions, a black support that is transparent to light in the blue spectral range. As a result, the same overall impression between the glass ceramic and the insert can be improved even further for the observer. For the user, thus, an overall image is presented, which conveys a visual impression that both the cooking surface and the insert are made of the same material, although this is actually not the case.

Last but not least, this embodiment of the insert can also ensure that components arranged thereunder, in particular the electronics and / or at least one light source, are covered and can not be seen from above through the insert. Under a concealment of the light source is understood that the emitted light passes through the insert in the activated state, that the light source as such with their shape, etc., but not or almost impossible to recognize in particular in the deactivated state.

It can be provided that the black support is designed as a film. Likewise, however, it can also be provided that the black edition is a print. The film is designed in particular as an adhesive film, wherein a coating can be produced for example by a material spray on this back.

Preferably, at least one symbol and / or a scale is applied to the back of the insert, by which or by which the user of the hob, the setting and / or display settings of a functional component of the hob, such as a cooking zone or the like, or a selected preparation program, can be displayed. Also, the symbol and / or the scale can be applied as a foil or as printing on this back. By having both the black pad and a symbol and / or a scale formed on the back of the insert, wear by abrasion or scratching can be prevented.

Preferably, at least one centering element is formed on the back of the insert, which is designed for relative positioning to a further component of the hob, in particular a display unit and / or a light source. Preferably, the centering element engages in the assembled state of the hob in a corresponding centering recess in the display unit or a circuit board on which the electronics for the display unit and / or a light source is arranged, a. This embodiment of the insert can be made possible in a particularly effective manner, the exact relative positioning of the insert to the underlying display unit and / or the light source. As a result, it can be reliably and precisely ensured that the display or the light emitted by a light source passes through the light at the desired specific location of the insert and can be recognized by the observer. A symbol and / or a scale is thus backlit at the exact desired position and unwanted shadowing or light distortions and thus a blurred perceived image can be prevented.

Preferably, the insert is trapezoidal, whereby the adjustments in the neck can be made particularly low. Preferably, the cutout is formed trapezoidal, whereby a shape equality between the cut and the insert is given.

In a method according to the invention for producing a hob, a glass ceramic of a cooking surface of the hob is cut out at the edge and in a Used decorative frame, wherein in the edge-side cutout a blue light-permeable insert is used, which is preferably connected to two different adhesives with the glass ceramic. By this embodiment, a space-minimized hob can be provided, in which the positioning of the individual components can be fixed relative to each other exactly and can be maintained exactly during the manufacturing process. Unwanted tolerances can be avoided.

Preferably, it is provided that the insertion of the glass ceramic and the insert takes place in the decorative frame before the introduction of both adhesives and only then a first adhesive and subsequently a second adhesive for connection of the insert is introduced with the glass ceramic. By this procedure, a very effective and thus time-minimized production can be achieved.

It can also be provided that first the glass ceramic is glued to the insert and this overall construct is subsequently inserted into the decorative frame.

Preferably, the decorative frame is provided with its rear side pointing upwards and the glass ceramic provided with the cutout inserted with its rear side pointing upwards into the decorative frame, wherein the insert facing upwards with its rear side is inserted into the cutout in this way. The production and assembly is thus performed quasi in an inverted position, since this positioning can be done relatively easily. This is in particular given by the fact that the decorative frames are formed quasi trough-like and allows easy and self-holding insertion of the glass ceramic and the insert.

In addition, by such a procedure, the subsequent introduction of the adhesives can be made very accurate. In particular, a UV adhesive is then first introduced, which is preferably introduced only selectively into the gap between the insert and the glass ceramic. After the curing of the UV adhesive, a silicone adhesive is then preferably introduced into the gap as a coherent strand.

Preferably, the gap filled with the adhesive between the insert and the glass ceramic is covered on the top with a decorative frame.

The hob includes a decorative frame which surrounds the glass ceramic and the insert circumferentially. This can be formed as a separate decorative frame to those decorative frame, which covers the gap between the insert and the glass ceramic in the cutout. Preferably, however, it is provided that the decorative frame which surrounds the glass ceramic and the insert circumferentially and the decorative frame, which covers the gap between the insert and the glass ceramic in the cutout of the glass ceramic, are integrally formed. Here, too, a simple and tolerance-free attachment of the components can thus be made possible. In addition, the production can be accelerated because not two separate decorative frames must first be accurately positioned relative to each other and then the other components must be connected to it. Again, unwanted tolerances can thus be avoided.

Advantageous embodiments of the hob according to the invention are to be regarded as advantageous embodiments of the method according to the invention.

Fig. 1

eine Draufsicht auf ein erfindungsgemäßes Kochfeld;

Fig 2

eine Schnittdarstellung des Kochfelds gemäß Fig. 1;

Fig. 3

eine vergrößerte Darstellung einer Draufsicht des Einlegers des Kochfelds gemäß Fig .1; und

Fig. 4

eine Seitenansicht des Einlegers gemäß Fig. 3.

An embodiment of the invention will be explained in more detail with reference to schematic drawings. Show it:

Fig. 1

a plan view of an inventive hob;

Fig. 2

a sectional view of the hob according to Fig. 1 ;

Fig. 3

an enlarged view of a top view of the insert of the hob according to Fig .1 ; and

Fig. 4

a side view of the insert according to Fig. 3 ,

In the figures, identical or functionally identical elements are provided with the same reference numerals.

In Fig. 1 is a cooking field 1 is shown in a plan view, which has a cooking surface 2 of glass ceramic 3. On this glass ceramic 3, a preparation vessel, such as a pot or a pan or the like, can be positioned or placed. The cooking surface 2 comprises at least one cooking zone not shown in detail, which has a heating device.

At the front edge 7 of the glass ceramic 3 and thus also of the hob 1, an edge-side cutout 4 is formed centrally in the glass ceramic 3 in the x-direction. Im in Fig. 1 shown assembled state of the hob 1, a depositor 5 is arranged in this cutout 4, which is formed from a different material compared to the glass ceramic 3. In particular, this diversity of the material is designed with regard to the different optical properties of the glass ceramic 3 and the insert 5. The cutout 4 and the insert 5 are trapezoidal in the embodiment, wherein a front edge 6 of the insert 5 is arranged flush with the front edge 7 of the glass ceramic 3. The insert 5 thus does not extend beyond the front edge 7 of the glass ceramic, whereby a space-saving design of the hob 1 is achieved. However, by the insert 5 is positioned as far outside and thus in the marginal cutout 4, the other cooking surface 2 is not limited in their dimensions and the functionality especially with regard to the dimensioning and arrangement of the cooking zones, thus by the position of the insert 5 not impaired.

The insert 5 is formed according to the invention of gray glass and permeable, inter alia, for light in the blue spectral range, in particular translucent. In addition, the insert 5 is also permeable to light in the red and yellow spectral range. With this configuration, the display of different colors can be made possible, whereby a variety of settings, various operations and various displays can be specified in color. By means of this distinguishing feature, the user of the hob 1 can thus also be made more quickly and more distinguishably able to display a wide variety of information. Since the material of the glass ceramic 3 absorbs light of the blue spectral range, the functionality of the hob and in particular of the display and / or operating region of the hob 1 can be substantially improved by the insert 5. By the insert 5 of the display and / or operating range of the hob 1 is specified. These are below of the insert 5 one or more light sources, in particular light emitting diodes, arranged. Likewise, a board, which has the control electronics, is arranged below the insert 5.

The insert 5 is spaced and arranged without contact to the glass ceramic 3 in the cutout 4. A formed between the insert 5 and the glass ceramic 3 gap 8 has a width b1, which is about 4 mm in the embodiment.

The insert 5 is connected by two different adhesives with the glass ceramic 3 in the cutout 4. On the one hand, provision is made for fastening to be provided by means of a UV adhesive which is only selectively formed, on the other hand, in addition, a silicone adhesive 10 being provided. This is formed strand-like and extends over the entire length of the cutout 4 between the glass ceramic 3 and the insert 5. The UV adhesive is realized only by the adhesive dots 9a, 9b, 9c and 9d.

In addition, this UV adhesive is also peripherally provided for the attachment of a decorative frame 12 with the glass ceramic 3 and the insert 5, wherein in this regard adhesive dots 9e, 9f, 9g, 9h, 9i, 9j, 9k, 9l and 9m are marked. Both the location of these adhesive dots 9e to 9m and the number of adhesive dots on each of the peripheral sides of the perimeter are merely exemplary. Preferably, a plurality of such adhesive dots are formed on each of the peripheral sides on the circumference.

In addition to the circumferentially formed decorative frame 12 and the gap 8 in the cutout 4 by a decorative frame 13 when viewed from above and thus in the plan view according to Fig. 1 covered. Preferably, the decorative frame 12 and the decorative frame 13 is integrally formed, and form the entire decorative frame eleventh

The decorative frame 13 has a width b2, which is 15 mm in the embodiment.

In addition to the decorative frame 11, the hob 1 also comprises a mounting frame 14 (FIG. Fig. 2 ) which is connected to the decorative frame 11 in particular with the peripheral decorative frame 12. Between the decorative frame 11 and the mounting frame 14 is the Glass ceramic 3 and the insert 5 arranged or clamped and held positionally stable.

On the back of the insert 5 two centering elements 15 and 16 are arranged in the embodiment, which extend like a pin down. The centering elements 15 and 16 engage in the assembled state of the hob 1 in recesses of the underlying board of the control electronics, whereby an exact positioning between the insert 5 and the display unit and / or the light sources is given. As a result, the light emitted by the light sources and the display unit light can pass in a very precise manner at the desired specific positions through the insert 5 and a position-specific backlighting can be ensured.

In Fig. 2 is a sectional view along the section line II-II of the hob 1 according to Fig. 1 shown. The same as the centering element 16 downwardly tapered centering element 15 is shown. In the illustration according to Fig. 2 is the clarity serving the decorative frame 13 is not shown on the gap 8. As in the illustration according to Fig. 2 can be seen, the insert 5 has the same thickness (expansion in the z-direction) as the glass ceramic 3.

In Fig. 3 is a plan view of the insert 5 shown. On the front of a scale 22 and 23, 24, 25 and 26 areas to recognize symbols can be seen. Both the scale 22 and the areas 23 to 26 are on an in Fig. 4 shown rear side 18 of the insert 5 arranged, in particular imprinted. The scale 22 and the areas 23 to 26 are printed from a white color, which when viewed from the top by the configuration of the insert 5 as gray glass no longer pure white, but appear in a gray tone. In addition, the scale 22 and the areas 23 to 26, the transmission of the light in the blue spectral range is not affected.

In Fig. 4 is a side view of the insert 5 as shown in FIG Fig. 3 shown. On the back 18, in addition to the printing with the scale 22 and the areas 23 to 26 on the remaining surface, a black support 21 is applied, which as a film or in particular can be realized as a print. This overlay 21 does not affect the transmission of the light of the blue spectral range.

The centering element 15 has a splice 19, with the attachment to corresponding components of the hob 1 is made possible. In addition, the tip 20 of the centering element 15 engages in the mentioned recess in the arranged under the insert 5 board. In an analogous manner, the centering element 16 is formed.

For the production of the hob 1 as shown in FIG Fig. 1 First, the decorative frame 12, 13 is turned over and the top is thus turned down on a mounting device. The already provided with the cutout 4 glass ceramic 3 is then also turned around and with their in Fig. 1 shown top turned down in this decorative frame 12, 13 used. In a corresponding manner, the introduction of the insert 5 in the decorative frame 12, 13 method, so that here then the top or front 17 is arranged facing downward. In a subsequent manufacturing step, the UV adhesive is then introduced selectively, as shown by way of example at the corresponding adhesive points 9a to 9m. In particular, several adhesive dots are realized on the peripheral sides per side. After curing of the UV adhesive, the silicone adhesive 10 is then introduced as a strand in the gap 8. The printing of the insert 5 on the back 18 with the areas 23 to 26, the scale 22 and the black support 21 is carried out before inserting the insert 5 in the inverted decorative frame 12, 13. By means of the UV adhesive and the silicone adhesive 10, the insert 5 is connected to the decorative frame 12, 13 and the glass ceramic 3.

Subsequently, the mounting frame 14 is then mounted. Further or preceding process steps are of secondary importance to the invention and are not mentioned here in detail since they represent essentially known process steps.

In addition, it should be mentioned that the connection between the insert 5 and the glass ceramic 3 can also be realized otherwise. The adhesive connection can thus also be replaced by another type of connection or optionally additionally supplemented
become.

Claims (14)

1. Hob with a cooking surface (2) which is embodied from glass ceramic (3), embodied for positioning of a preparation vessel, wherein the cooking surface (2) features a cutout (4) in the outside edge of the glass ceramic (3), in which an insert (5) is arranged, characterised in that the insert (5) is embodied from a material that differs from the glass ceramic (3), which is permeable to light of the blue spectral range, and the insert (5) is embodied from grey glass.
2. Hob according to claim 1, characterised in that a front edge (6) of the insert (5) is arranged flush with the front edge (7) of the glass ceramic (3).
3. Hob according to one of the preceding claims, characterised in that the hob (5) is glued into the cutout (4).
4. Hob according to claim 3, characterised in that the insert (5) is attached with different adhesives (9a through 9m, 10) in the cutout (4).
5. Hob according to claim 3 or 4, characterised in that the insert (5) is attached with a UV adhesive (9a to 9m) and a silicon adhesive (10) in the cutout (4).
6. Hob according to claim 5, characterised in that, in the gap (8) formed between the insert (5) and the glass ceramic (3) in the cutout (4) the UV adhesive (9a through 9d) is embodied as dots and the silicon adhesive (10) as a contiguous bead.
7. Hob according to one of the preceding claims, characterised in that a gap (8) formed between the insert (5) and the glass ceramic (3) in the cutout (4) has a width (b1) of between 2 mm and 6 mm, especially 4 mm.
8. Hob according to one of the preceding claims, characterised in that the gap (8) between the insert (5) and the glass ceramic (3) and the adhesive (9a through 9d, 10) embodied in the gap is covered at the top by a decorative frame (11, 12, 13).
9. Hob according to claim 8, characterised in that the decorative frame (13) has a width (b2) of between 10 mm and 20 mm, especially 15 mm.
10. Hob according to claim 8 or 9, characterised in that the decorative frame (13) has a height of between 0.5 mm and 1 mm, especially 0.7 mm.
11. Hob according to one of the preceding claims, characterised in that at least one symbol (23 through 26) and/or a scale (22) is applied to the rear side (18) of the insert (5).
12. Hob according to one of the preceding claims, characterised in that at least one centring element (15, 16) is embodied on the rear side (18) of the insert (5), which is embodied for relative positioning in relation to a further component of the hob (1), especially a display unit and/or light source.
13. Hob according to one of the preceding claims, characterised in that the insert (5) is embodied in the shape of a trapezoid.
14. Method for producing a hob (1), in which a glass ceramic (3) of a cooking surface (2) is cut out on one edge and is inserted into a decorative frame (11, 12, 13) and an insert (5) embodied from grey glass, which is permeable to light in the blue spectral range, is inserted into the edge cutout (4).

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