CN109237553B

CN109237553B - Hot plate device with hot plate and furnace frame

Info

Publication number: CN109237553B
Application number: CN201810757004.2A
Authority: CN
Inventors: M.布拉策尔; M.丰克; G.克吕格
Original assignee: EGO Elektro Geratebau GmbH
Current assignee: EGO Elektro Geratebau GmbH
Priority date: 2017-07-11
Filing date: 2018-07-11
Publication date: 2022-07-19
Anticipated expiration: 2038-07-11
Also published as: ZA201804474B; EP3428540B1; RU2018124651A3; EP3428540A1; PL3428540T3; CN109237553A; RU2018124651A; RU2768337C2; DE102017211812A1

Abstract

A hot plate device has a hot plate with a hot plate body having a flat upper side and a lower side, a short tubular annular portion provided in a surrounding manner on the lower side, wherein the annular portion is arranged on the lower side close to an outer periphery of the hot plate body so as to protrude from the latter and, on the outer side, has a concave latching recess. A fastening ring for fastening a hot plate to a hob plate of a hob is provided, said fastening ring having a continuously encircling annular body on which at least two protruding latching projections are provided as latching connections for interaction with the recessed latching recesses of the short tubular annular portion.

Description

Hot plate device with hot plate and furnace frame

Technical Field

The present invention relates to a hot plate arrangement with a hot plate fastened to a furnace frame plate of a furnace frame. The invention also relates to such a hob with a corresponding hob plate and at least one hot plate arrangement thereon.

Background

From document EP 957661 a2 a hotplate is known with a hotplate body with a flat upper and lower side. A short tubular annular portion projects from the underside, proximate the outer periphery. A central thread is provided in the center of the underside of the hot plate body for screw-fitting the hot plate by means of a rod-shaped or cross-shaped counter bearing (counter bearing), the hot plate being inserted from above into a receiving opening in the furnace frame plate relative to the lower side of the furnace frame plate. However, depending on the type of construction of the counter bearing, there is the disadvantage that such a screw fit may deform the hot plate or the hot plate body, respectively, which may adversely affect the efficiency of the hot plate, or the transfer of the heating output of said hot plate to the cooking vessel placed thereon, respectively.

Disclosure of Invention

The invention is based on the object of achieving the initially mentioned hot plate device and a hob provided with at least one such hot plate device, by means of which the problems of the prior art can be solved and in particular a hot plate can be fastened to the hob in a simple and secure manner without any damaging effect.

This object is achieved by a hot plate device having the features of claim 1 and by a hob provided with at least one such hot plate device and having the features of claim 27. Advantageous and preferred design embodiments of the invention are the subject matter of the other claims and are explained in more detail below. Many of the features mentioned herein below are described only in the context of a hot plate arrangement or only in the context of a hob. Independently of this, however, the features are intended to be able to be applied individually and independently of one another not only to the hot plate device but also to the hob. The words of the claims are incorporated by express reference into the content of the description.

It is provided that the heat plate has a heat plate body with a flat upper side and a flat lower side. The heating conductor or the heating element, respectively, is arranged on the underside in a manner known per se from the prior art, which will not be explained further. Furthermore, a short tubular annular portion, advantageously substantially corresponding to the annular portion of the known prior art, is provided on the lower side of the hot plate body. The short tubular annular portion is provided on the lower side close to the outer periphery of the hot plate body, in particular integrally molded therewith, and is thus an integral component part of the hot plate body. The short tubular annular portion is configured to be at least partially, and advantageously completely, circumferentially disposed. The short tubular annular portions project from the lower side in a direction away from the upper side, respectively, and are substantially perpendicular with respect to the upper side. The height of the short tubular annular portion may advantageously vary between 1cm and 5cm, particularly advantageously between 2cm and 3 cm.

According to the invention, it is provided that the short annular tubular part has at least one concave latching recess or a convex latching projection in the form of a latching recess. The heat plate arrangement further has snap connection means as a snap connection for interacting with the at least one concave snap recess or the at least one protruding snap projection of the short tubular ring section. The snap connection means are thus configured for fastening the hot plate to the furnace frame plate by means of the short tubular annular portion. The snap connection means are respectively configured as a separate part from the thermal plate body, or at least as a separate part from the thermal plate body.

When the latching connection means are additionally also supported on the furnace frame plate, the latching connection advantageously holds the hot plate on the furnace frame plate of the furnace frame on the underside of said furnace frame plate. A pretension for the support is advantageously provided here, in particular for keeping the latching connection immovable.

Since the receiving opening for the hotplate on the furnace frame plate is usually only slightly larger than the mentioned short tubular ring-shaped portion, the fastening means distributed in this outer region can be realized as a snap-fit connection for the hotplate with the furnace frame plate. Since the mentioned outer periphery of the hot plate body in this region is advantageously supported on the furnace shelf plate, in particular on the upper side of the furnace shelf plate around the receiving opening, by an intermediate covering ring (also called a bead) known per se, a fastening of the hot plate to the furnace shelf plate is performed which does not introduce any significant forces into the hot plate body, in particular forces which may deform the hot plate body or which may adversely affect the planarity of the upper side of the hot plate body. Another potential advantage provided by the snap-lock connection is that the snap-lock connection can be established in an advantageously precisely predefined configuration without the use of tools. The snap connection may also be configured such that the snap connection may also be released without tools for subsequent disassembly or repair, or at least may be easily released using simple tools. The aforementioned pretensioning can also occur on the covering ring or the bead, respectively, or can be absorbed by the latter, advantageously by shaping thereof.

In an advantageous embodiment of the invention, a concave latching recess or a convex latching projection of the ring part is provided on the outside of the ring part. The concave latching recess or the projecting latching projection is thus located substantially below the periphery of the receiving opening and easily enables a twist-free fastening of the hot plate to the mentioned furnace frame plate. Alternatively, the concave latch recess or the convex latch protrusion may also be provided on the inner side; in this case, however, the design embodiment of the fastening ring is significantly more complicated.

In a further embodiment of the invention, a plurality of latching recesses or the latching projections mentioned can be provided one after the other in a direction away from the upper side of the heat plate and therefore with different spacings from the upper side. Thereby, since different snap depths can be provided, it is thereby possible that the snap connection is established by the annular portion in the receiving opening of the furnace frame plate by different insertion depths of the hot plate. Alternatively, a plurality of latching projections or latching recesses arranged one behind the other at a distance may also be attached to the fastening ring, which, however, makes the construction of the fastening ring significantly more complicated.

In a first embodiment of the basic design of the invention, the hot plate arrangement has a fastening ring as a snap connection means, by means of which the hot plate is fastened to the furnace frame plate. The fastening ring is configured separately from the hot plate and has a continuously encircling annular body having a shape corresponding to the encircling short tubular annular portion, thus being circular or annular with advantageously larger or smaller diameters, respectively. The fastening ring has at least one protruding locking projection and/or one recessed locking recess on the ring-shaped body. The protruding catch projection and/or the recessed catch recess interact with the recessed catch recess or the protruding catch projection on the short tubular annular portion and thus form a catch connection between the fastening ring and the tubular portion. When the fastening ring is also supported on the furnace frame plate or on its underside, respectively, the hot plate is held on the furnace frame plate of the furnace frame by means of this snap-on connection of the fastening ring. A pretensioning of the support is advantageously provided here, in particular for keeping the latching connection immovable.

In another design embodiment of the invention, the fastening ring may have a diameter that is greater than the diameter of the annular portion. The diameter can be 1 to 5 percent larger; in other words, there may be a radial spacing between the two portions of between 1mm and 10 mm. The spacing of the fastening ring from the annular portion should not be so great that no disturbing offset between the portions can occur. At the same time, the latching effect should be able to be performed in as active a manner as possible. In particular, a continuously encircling annular body has the mentioned spacing.

In an advantageous configuration of the invention, at least two projecting latching projections are provided on the annular body of the fastening ring. Thus, communicating latching recesses are provided on the ring-shaped part, which facilitates the production of two parts in each case. In particular when the hot plate body is produced in a known manner by casting, the latching recess is provided thereon relatively easily, for example as a milled recess or a plurality of grooves, or a groove, respectively. The locking recesses can then be produced by a subtractive process, which is easier than specially constructing a casting mold. In particular, existing casting molds can therefore also be used continuously.

The mentioned snap projections on the surrounding annular body of the fastening ring may advantageously be provided as separate parts and fastened to said surrounding annular body. The annular body and the latching projection are particularly advantageously made of metal and are connected to one another by welding. Even when the latching recesses on the annular portion of the heat plate body are provided in a circumferential manner or continuously, respectively, it is suggested that the latching projections are not configured in a continuous manner, so that they are still provided distributed, preferably in the same manner, in order to establish a uniform and secure latching connection. The snap connection is significantly better by the improved snap function of the snap projections of the fastening ring when there are separate snap projections configured separately from each other. Three, four or six such latching projections are advantageously provided.

Alternatively, it is possible for the fastening ring to be produced integrally as an annular body and preferably as a latching projection. For example, the latching projections herein may be bent from the remaining annular body.

The protruding latching projections of the fastening ring preferably have the shape of partial ring segments. The length of the projecting latching projections can advantageously be at least 5%, particularly preferably approximately 8% to 15%, or 2cm to 5cm, respectively, of the circumference of the fastening ring in each case.

If the fastening body and the latching projections of the fastening ring originally were to be separate parts, it is therefore possible for the separate parts to be produced from different material thicknesses. The fastening ring can thus be configured to be relatively stable and rigid in the first place in order to establish a firm and stable mounting of the hot plate on the hob plate. The latching projections can be made of a thinner and more elastic material, which has a certain spring effect, so that the latching connection is established in an actively automatic manner.

In an advantageous design embodiment of the invention, the latching projection has an angled cross section when viewed in the longitudinal direction. The cross section may have two legs, wherein the first leg, which is the fastening leg in the radial direction, points outward or extends outward, respectively. Thus, the first leg portion can be said to be parallel to the upper side of the hot plate body. The latching projection can be connected to the annular body in the above-mentioned manner via this side or the upper side of the fastening leg, respectively. The second leg of the latching projection as a latching leg with respect to the first latching leg may be bent at an angle of between 95 ° and 135 °. When the fastening ring extends externally around the short tubular annular portion, the catch legs should point radially inwards and away from the upper side of the hot plate body. The latching legs are thus supported from the outside in the latching recess or on the latching projection of the tubular part. By means of the mentioned corners an active latching effect and thus a stable latching connection can be achieved which presses the latching projection and in particular the second latching leg mainly in the direction of the upper side of the heat plate body. The hot plate is thus held firmly in the receiving opening of the furnace frame plate.

In a development of the invention, the second latching legs of the latching projections can form the radially innermost region of the fastening ring. The radius of the second latching legs may be smaller than the radius of the encircling annular body by 1mm to 10 mm. The second latching legs may engage into corresponding latching recesses in the ring-shaped portion at a depth of 0.5mm to 2mm or even 3mm, as seen in the radial direction.

In an advantageous development of the invention, the annular body can have an angled cross section, advantageously as a cross section of a double leg. The first leg may extend substantially parallel to the protruding ring portion. The second leg may be angled radially outwardly with respect to said first leg, for example at an angle between 70 ° and 110 °, advantageously substantially orthogonal, such that the second leg points substantially in a radial direction or extends in a radial direction. The material thickness of the fastening ring may be between 1mm and 3 mm. The material thickness of the snap-lock projections on the fastening ring can be small, for example, between 0.3mm and 1.5 mm.

The described snap-lock protrusions can be provided or fastened, respectively, to the above-mentioned fastening ring in one area, in particular in a plurality of areas provided in an even distribution. The latching projection is in particular provided as a separate part on the underside of the radially outwardly bent second leg of the fastening ring. The latching projections thus form part of the fastening ring, which is furthest away from the hob plate, so that the encircling annular body of the fastening ring can be supported on the underside of the hob plate.

In a further second basic design embodiment of the invention, the snap-on connection means have at least two separate snap clips for the hot plate in order to fasten the hot plate to the hob plate by means of the short tubular ring section. The female latching recesses or the projecting latching projections for latching connection to the short tubular ring section or, respectively, one of the latching clips herein for engagement therein, advantageously have spring latching legs or latching sections corresponding to the above-mentioned latching projections on the fastening ring. The latching clips still have fastening legs or fastening portions by means of which they are supported from below with respect to the furnace floor plate.

In a development of the invention, the latching clip can have a contact-pressure portion which adjoins the fastening leg or the fastening portion. The contact pressure portion, which may also be a contact pressure leg, is preferably provided at the free end opposite the latching leg or the latching portion. The contact pressure portion is engageable through a receiving opening of the furnace frame plate. The latching clip can thus be prevented from rotating or twisting, and the latching connection can be released therein, by bearing against or by exerting a contact pressure on the outside of the ring section, respectively.

The concave latching recess is preferably attached to the outside of the protruding ring-shaped portion of the heat plate body. The concave catch recess may be spaced from the underside of the platen body or from the connection of the protruding ring portion to the platen body by at least 40% of the height of the ring portion. Said distance is advantageously about 60% to 70% of the height. Thus, the latching recess should not be just at the end of the ring section, but at the same time should not be too close to the hot plate, in order to allow a latching connection that can be established in a reliable manner. This spacing from the free end of the protruding annular portion may preferably be at least 1mm, particularly preferably at least 4 mm.

As already mentioned above, the concave latching recess on the outside of the ring section is advantageously configured as a circumferential groove, so that instead of a continuous circumferential manner, an interruption can be provided. The length of the latching recesses on the outside of the protruding ring section should amount to between 30% and 70% of the circumference of the ring section. Even when it is not relevant for a snap-lock connection with a plurality of separate snap-lock projections of the fastening ring, since the snap-lock projections can be completely locked with the surrounding snap-lock recesses as recesses, a positioning protection or an anti-rotation protection, respectively, can be achieved and, likewise, an indication of the position easily recognizable by the installation technician can be achieved. For example, the individual latching recesses may thus have a length which is at most 1% to 10% longer than the length of the protruding latching projections on the annular body. In a further embodiment of the invention, it is also possible that such an anti-rotation protection is provided only for a single latching recess on the ring part and a single latching projection on the fastening ring, which is sufficient for this function.

Alternatively, as mentioned at the outset, it can be provided that a continuously encircling groove forming a concave latching recess for a plurality of latching projections of the fastening ring is provided on the outside of the ring section. This can be produced very easily by turning the hot plate body.

In order to assemble or construct the hob according to the invention, respectively, the hob has a hob plate with at least one receiving opening, and the previously described hot plates are introduced into the receiving opening from the upper side of the hob plate until the hot plates are supported on the upper side. The surrounding cover ring, which may be provided herein as a bead having a cross section shaped substantially as an inverted U, is previously assembled on the hot plate. Such a covering ring according to the known prior art is supported below the periphery of the heat plate body, which projects beyond the annular portion in the radial direction and projects slightly beyond said projecting periphery in the radial direction. The covering ring is supported on the upper side of the hob plate, in particular on the upper side of the raised area, in the center of which the receiving opening is located, by means of radially outward and relatively long legs around the receiving opening. After fastening, the covering ring bears in a force-impacting manner thereon and forms a protection against dirt and/or liquid ingress between the hot plate and the hob plate.

In order to fasten the hot plate to the hob plate, a fastening ring such as described above is then pushed onto the short tubular ring-shaped portion from the underside of the hob plate in such a way that the fastening ring bears on the underside of the hob plate. By means of the protruding latching projection or the recessed latching recess, the fastening ring interacts as a latching connection with the recessed latching recess or the protruding latching projection of the short tubular annular portion in such a way that the hot plate is fastened to the furnace frame plate in the receiving opening. For this purpose, the latching projections and latching recesses have to be optionally in a specific mutual rotational position, which is however easy to achieve, for example, by means of markings on the parts. Different lengths of the latching projections and/or latching recesses can also be provided, which makes it possible to visualize that the latching connection is realized by a single position only.

In the case of a completely assembled hob, it can be provided that a portion of the fastening ring, in particular of the annular body, projects upwards through the receiving opening by means of the above-mentioned first leg. Thus, an additional centering and positioning accurate arrangement of the fastening ring on the hob plate can be performed. The fastening ring is advantageously covered by the aforementioned preferred covering ring.

In a further embodiment of the invention, it can be provided that the recess or the projection is provided on the inner circumference of the receiving opening. The communicated protrusion or the communicated notch can be respectively arranged on the fastening ring. Thereby, both a predefined assembly position and in particular an advantageous anti-rotation protection device can be achieved. Here, the recess can be stamped relatively easily together into the peripheral edge of the receiving opening when the receiving opening is produced, for example by means of a correspondingly modified stamping tool; alternatively, the notches may also be incorporated subsequently. Corresponding projections can be produced on the fastening ring, for example, by bending a portion or a type of tab (tab) outwards, which then bears in a recess on the inner circumference of the receiving opening.

These and other features are apparent from the description and drawings, not only from the claims, but also from the independent features which can be realized in each case by themselves or jointly in the form of sub-combinations in the embodiments of the invention and in other fields and can constitute advantageous and inherently protectable embodiments as claimed herein. The separation of the present application into separate paragraphs and sub-headings does not limit the overall effectiveness of the statements made below.

Drawings

Exemplary embodiments of the invention are schematically illustrated in the drawings and will be explained in more detail below. In the drawings:

fig. 1 shows a sectional view through a section of a hob according to the invention, with a first latching connection according to the invention of a hot plate on a hob plate;

FIG. 2 shows an enlarged cross-sectional view through a fastening ring corresponding to FIG. 1;

FIG. 3 shows a plan view of the entire fastening ring corresponding to FIG. 2;

FIG. 4 shows an oblique view of the hot plate of FIG. 1 with two surrounding latching notches as grooves;

FIG. 5 shows a cross-sectional view through the thermal plate of FIG. 4 in the view of FIG. 1;

FIG. 6 shows a modification of the hot plate in a view similar to FIG. 5, with only a single surrounding latch recess;

FIG. 7 shows an oblique view from below of another heat plate according to the invention, with the latching notches not in a completely encircling manner;

figure 8 shows a plan view of a hob according to the invention with four hot plates;

FIG. 9 shows a sectional view through a section of another hob according to the invention, with a second snap connection according to the invention of a hot plate on the hob plate;

FIG. 10 shows a plan view of a latching clip corresponding to FIG. 9;

Fig. 11 shows a plan view of the underside of fig. 9, with four latching clips for fastening.

Detailed Description

Fig. 1 shows a hob 11 according to the invention in a sectioned lateral sectional view. The hob 11 has a hob plate 13 formed of a stainless steel plate, said hob plate 13 having an upper side 14 and a lower side 15. These can also be other materials, such as enamelled or painted steel sheets. The elevation 17 is likewise conventional per se and, as shown in fig. 8, is rotationally symmetrical and has the aforementioned receiving opening 18 in the center, provided for the hot plate device 20 according to the invention. A hot plate device 20 is inserted into and fastened to said housing opening 18.

The platen device 20 itself has a platen 22, the platen 22 having a platen body 23 with an upper side 25 and a lower side 26. As is known for hot plates, the upper side 25 is mainly flat. The annular portion 28 projects from the lower side 26, or respectively integrally molded thereon, generally orthogonally with respect to the upper side 25, and may in fact be about 1cm to 2cm long. A projecting outer peripheral edge 29 is provided on platen body 23 so as to be radially outward of annular portion 28. For this purpose, the heat plate 22 is constructed in principle as known from the prior art.

The annular portion 28 on the outer side 30 has two identically configured recessed snap-

lock notches

32a and 32b on top of each other, which represent part of the present invention and are heretofore unknown. The latch recesses 32a and 32b may be configured so as to correspond to fig. 4 or 7. The latching

notches

32a and 32b are in principle of identical construction and extend obliquely into the outer side 30 of the ring portion 28, that is to say, for example, at an angle of approximately 10 ° to 15 °. The mutual spacing of the latching

notches

32a and 32b can be a few millimeters, for example 3mm to 6 mm.

A fastening ring 35 made up of a plurality of parts extends around the annular portion 28. On the one hand, the fastening ring 35 has a continuous circumferential annular body 37 (for which purpose reference is also made to the enlarged independent view of fig. 2 and to the plan view of fig. 3). The annular body 37 has an angled cross section with a first vertical leg 38 which extends substantially parallel to the longitudinal direction of the annular portion 28 or respectively orthogonally with respect to the upper side 25 of the hot plate 22. The first leg 38 merges into the second leg 39 in a substantially orthogonal manner, which is advantageously achieved by the production of a one-piece part, preferably from metal or thick sheet metal, respectively. A latching projection 41 is provided on the underside of the second leg 39, in particular fastened thereto, in particular fixedly welded thereto in the case of a corresponding metal construction. The latching projection 41 has a first fastening leg 42 which extends parallel to the second leg 39 of the annular body 37 and is fastened to the latter, advantageously fixedly welded thereto. The second latching legs 43 of the latching projections 41 are bent in an angular manner with respect thereto, advantageously at an angle of approximately 100 ° to 110 °. The catch projection 41 is advantageously made of a bent metal plate, for example, having a half thickness, for example, 1mm to 2mm, compared to the annular body 37. The length of the second shackle leg 43 in cross section may be about 8mm to 12mm, or even up to 15 mm.

As can be seen in the plan view of fig. 3, four identical latching projections 41 are fastened (advantageously fixedly welded) to the fastening ring 35. The latching projections 41 are distributed in the same manner, but this is not essential, wherein each latching projection 41 is about half the length of the spacing between two adjacent latching projections. It is also clear from fig. 3 that the latching projections 41 are radially within the annular body 37 or respectively engage further inwards. This is a significant advantage in terms of the fastening function.

In the case of the hot plate device 20 of the hob 11 in fig. 1, a surrounding covering ring 45 with a cross section shaped as a substantially inverted U is supported on the outside 30 of the ring section 28 below the outer peripheral edge 29. The surrounding cover ring 45 is formed from a thinner metal sheet, advantageously a stainless steel sheet, which is relatively resilient. Such covering rings 45 are known from the prior art and need not be explained here in further detail. The covering ring 45 serves to achieve a visually attractive connection, or protection against contamination and liquid ingress, respectively, and a corresponding transition between the hot plate 22 and the upper side 14 of the hob plate 13. The hotplate 22 is pushed against the furnace frame plate 13 or its upper side 14, respectively, by means of a covering ring 45. The heat plate 22, which is a snap connection, is held therein, with the snap projections 41 engaging in a spring-like manner in the snap recesses 32b by way of their snap legs 43 as on the annular body 37 of the fastening ring 35. The latching legs 43 here are bent radially inwards with respect to the fastening legs 42 and can therefore be bent at a slightly larger angle, so that said latching legs 43 also engage in an actively fixed manner in the latching

notches

32a or 32 b.

To establish the snap-fit connection, the heat plate 22 with the covering ring 45 preassembled on the annular portion 28 is introduced from the upper side 14 into the receiving opening 18. The platens 22 described herein should be in a desired or predefined rotational position, respectively. The fastening ring 35 is then guided over the annular portion 28 on the underside 15 of the hob plate 13, ideally also in a precisely predefined mutual rotational position. Although the annular body 37 projects with its first leg 38 through the receiving opening 18 as well, so that said annular body 37 is supported with its second leg 39 on the underside 15 of the furnace frame plate 13 on the periphery of the receiving opening 18, the lower end of the latching leg 43 of the latching projection 41 latches into the latching recess 32b and thus fixedly holds the hotplate 22 against the furnace frame plate 13 on the annular portion 28.

As mentioned above, the index (index) projection 40, indicated by a dashed line in fig. 3, can be provided at a specific position on the fastening ring 35, advantageously on the annular body 37. The index projection 40 can interact with a readily imaginable and correspondingly configured recess on the inner circumference of the receiving opening 18 in such a way that the index projection 40 engages in said recess in a rotationally fixed manner. When the fastening ring 35 in a similar manner is configured to be fixed against rotation with respect to the hot plate 22 or the annular portion 28 of the hot plate, respectively, the entire anti-rotation protection device can be realized. Any rotation of the fastening ring 35 with respect to the furnace frame plate 13 can thus be prevented in a form-fitting manner, and not just in a force-fitting manner as in fig. 1.

This is better conceivable in a manner corresponding to fig. 7 by means of a design embodiment of the heat plate 122, wherein the latching

notches

132a and 132b are also provided exactly so as to be connected to one another on the outer side 130 of the ring portion 128, said latching

notches

132a and 132b, however, not being in a completely encircling manner. The latching

notches

132a and 132b are configured so as to be only slightly longer than the latching projections 41 or the latching legs 43, respectively, so that, according to fig. 3, said notches and projections or legs, respectively, jointly form a form-fitting anti-rotation protection means. The fastening of the hotplate 122 to the hob in a precisely predefined rotational position can be performed by corresponding markings on the hotplate 122, for example by means of a recess 131 on the underside of the annular portion 128, wherein a form-fitting anti-rotation protection is also formed thereby.

When the four latching projections 41 or latching legs 43 according to fig. 3 engage in the latching recesses 32a or 32b according to fig. 4, respectively, on the ring portion 28, the anti-rotation protection of the hot plate 22 on the hob plate 13 can be realized not only by the design embodiment of the hot plate body 123 in a manner corresponding to fig. 7 or by the index projections 40 in a manner corresponding to fig. 3, but also by friction only in a force-fitting manner.

The angled view of the platen 22 of FIG. 4 illustrates how the two snap-

lock notches

32a and 32b are configured to wrap around, or to wrap around grooves, respectively. This is the simplest in terms of production and can be performed by a turning procedure on the hot plate body 23 which is done in itself. The hot plates, which are conventional per se, can thus also be machined in a corresponding manner for the invention, respectively, or casting molds known per se can be used, so that no major investment costs are required for the invention.

The hot plate 22 in figure 1 is again shown in isolation in the sectional view of figure 5. It can be seen how an annular portion 28 projects on the bottom of the hot plate body 23, having a flat upper side 25 and an outer peripheral edge 29, a surrounding design embodiment of said annular portion 28 being easily visible from figure 4. The two

latching notches

32a and 32b on top of each other can be seen particularly clearly here, said latching

notches

32a and 32b being configured as oblique recesses. The mutual spacing of the latching

notches

32a and 32b is relatively small, so that a relatively fine graduation of the latching depth is possible. With this design embodiment, the upper latching recess 32a can be used with a slightly lower covering ring 45 or shorter latching legs 43, as can be easily imagined with the aid of fig. 1. Even more latching notches can easily be provided.

In a modification thereof, according to FIG. 6, where platens 222 have a platen body 223 of otherwise identical construction, only a single snap-lock recess 232 is provided, including upper side 225 and lower side 226, as well as outer periphery 229 and annular portion 228. The latch recess 232 is provided at the same position as the lower latch recess 32b in the case of fig. 5. This design embodiment is to be secured by means of a snap connection in only a single position.

It can furthermore be provided that an opening with a spacing from each outer circumference is provided in the latching legs 43, which opening is also alternatively on the lower circumference, through which opening a tool, for example a narrow screwdriver, can be introduced in order to release the latching connection again. To this end, the latching legs 43 may be bent in a radially outward manner and thus away from the latching notches 32 b. When this applies to all latching legs 43 of the latching projection 41, including for example successive corresponding latching recesses, the fastening ring 35 can be removed again and the hot plate 22 can be detached, for example replaced.

The hob 11 according to the invention can be seen in plan view in fig. 8. Four hot plate arrangements 20 or four hot plates 22 are respectively mounted in a hob plate 13, which is rectangular in nature, which has an upper side 14, in particular in the center of the respective elevation 17 provided. However, there may also be fewer hot plate devices 20 on one hob, in some cases only a single hot plate device 20 on the hob.

As an easily conceivable alternative, the recess can also be provided on the inside of the ring-shaped part 28, and the latching legs can in this case engage from the outside to the inside in the manner of a U-shaped assembly claw. In this case, the latter should also project outwards and bear on the underside 15 of the hob plate 13.

In fig. 9 to 11, in a second basic design embodiment of the invention with a further hot plate arrangement 320 according to the invention, in a manner similar to fig. 1, a further hob 311 according to the invention is shown in section in a side sectional view. The stove rack 311 has a stove rack plate 313 with an upper side 314 and a lower side 315, said stove rack plate 313 having a raised portion 317 which is rotationally symmetrical about a central receiving opening 318 in the raised portion. A hot plate 322 having a hot plate body 323 and an upper side 325 and an annular portion 328 comprising a covering ring 345 is fastened from above to the hob plate 313. The hot plate 322 corresponds to the hot plate in fig. 1, wherein a short encircling annular portion 328 is molded to the underside 326 and on the outside 330 of said annular portion 328 there are two groove-shaped

latching notches

332a and 332b extending at least partially in the circumferential direction.

In order to fasten and fix hot plate 322 to hob plate 313, a latching clip 341 is provided in a sectional view, said latching clip 341 advantageously consisting of a thin metal plate having a certain thickness (for example, 0.7mm to 1.5mm) and having a specific shape. The latching clip 341 is supported by fastening legs 342 projecting radially outwards, close to the receiving opening 318, against the underside 315 of the furnace frame plate 313 or against the lower inner circumference of the receiving opening 318, respectively. The elongated latching legs 343 project downwards in a similar manner to the latching projections 41 of the fastening ring 35 according to fig. 1. The latching legs 343 latch into the lower latching recesses 332b, said latching legs 343 fixedly holding the hotplate 320 on the hob 311 by support against the underside 315 of the hob plate 313.

On the one hand, in order to keep the latching clip 341 in its position in a reasonably stable manner and without being excessively inclined (here in a counterclockwise manner), said latching clip 341 projects through the receiving opening 318 by means of the upper contact pressure leg 344 and bears on the inner periphery of said receiving opening 318. On the other hand, the contact pressure leg 344 is supported by its free end with respect to the outer side 330 of the ring portion 328. The latching clips 341 are thus in fact fixedly supported at three points and hold the hot plate 322 or respectively not only pull said hot plate 322 in the longitudinal direction of the annular portion 328 towards the face of the furnace frame plate 313 but also center the annular portion 328 within the accommodation opening 318.

As can be seen from the bottom view of fig. 11, a plurality of latching clips 341, in particular four latching clips 341 of this type, are advantageously provided. The latching clips 341 are advantageously distributed in a desired manner, but this is not necessarily required. Even when it can be said that the surrounding annular body 37 of the fastening ring 35 holding all latching projections 41 together is therefore omitted compared to the previous exemplary embodiment, a stable fastening of the hotplate 322 or the hotplate arrangement 322, respectively, to the hob 311 can thus be performed. Each of the latch clips 341 is held in place independently and in an automated manner. Due to the fastening by means of the latching clips during the assembly procedure of the hob 311, several manipulations by hand may actually be required. Meanwhile, the separate snap clips 341 may be easier to fasten than a single unified fastening ring 35 having a plurality of snap protrusions thereon.

In some cases, the mentioned latching clips can be machined and bent from suitable spring stainless steel or the like (as is known for such latching clips), so that the production of the latching clips is very cost-effective. It is desirable to see from the plan view of fig. 10 of the latching clip 341 how the latching legs 343 transition into the fastening legs 342 towards the top, which in turn are adjoined by the contact-pressure legs 344. Such a latching clip can easily be bent from a corresponding metal sheet. A single thickness of sheet metal may be used and, as shown in the cross-sectional view of fig. 9, the forming is also relatively simple. Of course, more complex shapes can also be provided, for example, a metal sheet is also folded on itself for greater strength as a double of the material thickness. In order to improve the fastening of the hot plate to the hob 311, the spring effect of the faces substantially orthogonal to the hob plate 313 is also achieved in particular by a U-shaped bend (with a slight spacing between them) on the fastening legs 342.

An anti-rotation protection of hot plates 322 on hob 311 can also be easily achieved by such independent latching clips 341. For this purpose, the latching

recesses

332a or 332b are advantageously not integrated in a continuous circumferential manner, which, as mentioned above, is also suitable in principle for the receiving opening 318. A projection or a recess intended to prevent the latching clip 341 from sliding in the circumferential direction may again be provided on the receiving opening 318. However, this is easily conceivable and need not be further explained in this regard.

Claims

1. A platen apparatus having a platen, wherein the platen has:

-a heat plate body having a flat upper side and a lower side;

-a short tubular annular portion on the underside of the platen body, wherein the short tubular annular portion

-arranged on said lower side, close to the outer periphery of said hotplate body;

-at least partially in a circumferential manner;

-projecting away from the lower side or perpendicular to the lower side, respectively, in a direction towards the upper side,

it is characterized in that the preparation method is characterized in that,

-the short tubular annular portion has at least one concave catch recess or at least one convex catch projection on the inner side and/or the outer side;

-a snap connection means is provided as a snap connection to interact with at least one concave snap recess or at least one convex snap projection of the short tubular annular portion;

-the snap connection means are configured to be separated from the thermal plate body;

-the snap connection means are configured to fasten the hot plate to a hob plate by means of the short tubular annular portion;

wherein the snap-on connection means have a fastening ring for fastening the hot plate to the furnace frame plate by means of the short tubular ring-shaped portion, wherein the fastening ring has:

-a continuously encircling annular body;

-at least two protruding catch projections and/or recessed catch recesses on the annular body for interacting in a catch connection with the recessed catch recesses or protruding catch projections of the short tubular annular portion.

2. A heat plate arrangement as claimed in claim 1, wherein a concave latching recess or a convex latching projection of the ring-shaped portion is provided on the outer side of the ring-shaped portion.

3. A heat plate device as claimed in claim 1, characterized in that a plurality of concave catch recesses or convex catch projections on the ring portion are provided in succession with one another in the direction for establishing the catch connection or in the direction away from the upper side of the heat plate body, respectively, wherein the concave catch recesses or convex catch projections in said direction have in each case a different spacing from the upper side of the heat plate body.

4. A platen arrangement as claimed in claim 1, wherein the annular body has a diameter greater than a diameter of the annular portion.

5. A platen arrangement according to claim 4, wherein the annular body has a diameter 1% to 5% greater than the diameter of the annular portion, with a radial spacing of 1mm to 10 mm.

6. A hot plate device as claimed in claim 1, characterized in that at least two protruding latching projections are provided on the surrounding annular body, which are fastened as separate parts to the surrounding annular body.

7. A hot plate device as claimed in claim 6, wherein the at least two protruding latching projections are composed of metal and are fixedly welded to the annular body.

8. A hot plate device according to claim 1, wherein the protruding catch projections or the recessed catch recesses are distributed in the same way on the annular body.

9. A hot plate device according to claim 8, wherein four protruding latching projections are provided.

10. A platen arrangement according to claim 1, wherein the protruding snap projections on the tightening ring have the shape of part annular segments.

11. A platen arrangement according to claim 10, wherein the projecting snap-lock projections on the tightening ring are in each case at least 5% in length of the circumference of the tightening ring.

12. A platen device according to claim 1, wherein the latching projections have an angled cross-section with two legs, wherein a first leg in a radial direction is directed outwards, extends along one side of the annular body and is connected to the annular body by said side, wherein a second leg is bent at an angle between 95 ° and 135 ° with respect to the first leg and is directed radially inwards and away from the upper side of the platen body.

13. A platen arrangement according to claim 12, wherein the second leg of the snap-lock projection forms a radially innermost region of the fastening ring.

14. A hot plate device as claimed in claim 13, wherein the second leg has a radius which is 1mm to 10mm smaller than the radius of the surrounding annular body.

15. A platen device in accordance with claim 1, wherein said annular body has an angled cross-section that is a two-leg cross-section with a first leg extending parallel to said protruding annular portion and a second leg angled with respect to said first leg curving radially outward.

16. A hot plate device as claimed in claim 1, wherein the projecting snap-lock projection is fastened to an area of the fastening ring.

17. A hot plate device as claimed in claim 12, wherein the projecting snap-on projections are fastened to an area of the fastening ring and the projecting snap-on projections are fastened to the underside of the radially outwardly bent second leg of the fastening ring.

18. A hot plate device according to claim 1, wherein a concave snap recess is provided attached to the outside of the protruding ring shaped portion.

19. A platen device as claimed in claim 18, wherein the concave catch recess is provided attached to the outside of the projecting annular portion so that the connection with the underside of the platen body or with the projecting annular portion and the platen body is spaced by at least 40% of the height of the annular portion.

20. A hot plate device as claimed in claim 1, wherein the concave latching recess on the outside of the ring-shaped portion is configured not in a continuous encircling manner but with an interruption.

21. A hot plate apparatus as claimed in claim 20, wherein the length of the catch recess on the outside of the protruding annular portion is at most 1% to 10% longer than the length of the protruding catch projection on the annular body.

22. A hot plate device as claimed in claim 1, wherein the concave latching recess on the outside of the ring-shaped portion is configured as a continuous and circumferential groove.

23. A hob with a hob plate with at least one receiving opening; and having at least one hot plate device on the hob plate, wherein the hot plate device is constructed according to claim 1; having a hot plate, wherein the hot plate is introduced into the receiving opening from an upper side of the furnace frame plate and bears on the upper side, wherein the short tubular annular portion protrudes through the receiving opening, wherein, for fastening the hot plate to the furnace frame plate, a fastening ring is pushed onto the short tubular annular portion from a lower side of the furnace frame plate in such a way that the fastening ring bears on the lower side of the furnace frame plate, and the protruding latching projection or the recessed latching recess of the fastening ring acts as a latching connection in such a way that it interacts with the recessed latching recess or the protruding latching projection of the short tubular annular portion of the hot plate in the receiving opening in such a way that the hot plate is fastened to the furnace frame plate.

24. The hob according to claim 23, characterized in that a surrounding annular cover extends around the stub-like annular portion just below the upper side of the hot plate, which stub-like annular portion extends around above the upper side of the furnace hob plate and is supported on the upper side by a lower peripheral edge, wherein the surrounding annular cover supports on the upper side in a force-impacting manner after the snap-on connection between the fastening ring and the stub-like annular portion.

25. The hob according to claim 24, characterized in that a notch or a protrusion is provided on said receiving opening and a communicating protrusion or notch is provided on said fastening ring, said notches or said protrusions engaging each other as an anti-rotation protection of said fastening ring with respect to said hob plate.