EP0386533A2 - Electric cooking plate - Google Patents

Abstract

A mounting arrangement (1) is provided for an electric hotplate (2) using a support ring (10), which extends from the outermost circumferential area of the hotplate body (23) close to the cooking surface (24) to its outer circumference or to the mounting plate ( 3) forms a continuous one-piece, smooth surface and has a relatively flat collecting recess (13) for overflowing liquid between an inner and an outer ring profile (11, 12). The hotplate or the support ring can be assigned at least one shield and at least one securing and / or centering device for securing the position, so that simple and precise mounting results. Furthermore, the support ring (10) can be limited against downward deformation. <IMAGE>

Description

The invention relates to an electric hotplate or a mounting arrangement for at least one electric hotplate, which is designed according to the invention in such a way that a receptacle is assigned to it, which preferably determines its position of use, so that an arrangement which is advantageous for use is thereby achieved.

Furthermore, the invention relates to an electric hotplate with a cooking surface defining a setting plane on the top of a hotplate body and with a support ring defining a supporting plane on the underside with a supporting surface for support at the opening edge of a mounting plate provided for receiving the hotplate and with its upper side determining a standing level , wherein preferably the support ring between the hotplate body and the support surface passes substantially in one piece.

The invention is furthermore based on the object to provide an arrangement or an electric hotplate of the type mentioned, by means of which, with a simple construction and easy assembly, a securely supporting and sealed receptacle of the electric hotplate in a mounting plate is possible so that the cooking surface of the electric hotplate is at most is only slightly above the top of the mounting plate.

This object is achieved according to the invention in that means are provided by which an essentially one-piece, load-bearing connection between the hotplate body and the mounting plate is to be established and by which at least over a part of the peripheral zone surrounding the electric hotplate radially adjoining the outer periphery of the cooking surface a depression is formed in such a way that no parts projecting upward above the plateau are provided in this area. As a result, even with cooking vessels that protrude above the cooking surface and whose bottom is slightly lower in the edge region, there is no danger that they can stand up outside the outer circumference of the cooking surface, so that complete support is always guaranteed only on the cooking surface.

The depression is preferably in the form of a gutter-like catch depression, possibly segmented over the circumference, for example for boiling liquid or the like. formed and n if limited on one or at the side flanks by upright wall sections, these flanks expediently flat, namely rising at most at an angle of about 45 °. In this respect, the depression can be flat-shell-shaped in cross-section, curved in an arc-shaped manner over its entire width and / or V-shaped, or a mixed form of two or more of these basic shapes.

A particularly advantageous development of the described or another electric hotplate is that the support ring is assigned at least one securing member for easy releasable securing against lifting the hotplate out of the mounting plate, so that despite the immediate, downward securing of the hotplate body, the support ring itself is additionally is directly secured against the mounting plate and, for example, there is no risk that it can be pulled upwards when a stuck cooking vessel is lifted in the outer edge region. It is particularly advantageous if the securing member or the like, not by a bolt or the like, but by a snap member, a cabinet or bending tab. is formed, since the securing member can then be formed essentially in one piece with a sheet metal part. This sheet metal part can be the support ring itself or at least one separate sheet metal part which is expediently positively connected to the support ring, for example by means of a seam connection.

The electric hotplate according to the invention is also particularly suitable for installation in mounting plates made of temperature-sensitive materials, since the support ring can have a relatively large ring width in such a way that it radiates the heat energy directly supplied to it by the hotplate body to such an extent that it engages with the outside area with the mounting plate only has a relatively low temperature. Appropriately, additional means for heat shielding the mounting plate or the edge of the mounting opening from the electric hotplate are provided, which means can be structurally combined with the securing member or the securing members, so that no separate components are required. A lower, lid-like closure for the hotplate body can also be structurally combined with the shield or formed by it.

A particularly advantageous embodiment of an assembly or hob arrangement also results if the mounting plate is reduced or offset in thickness in the region of the engagement of the support ring, it preferably having a recessed ring shoulder on the top, so that the support ring approximately up to the outer periphery of the hotplate body only needs to reach at most the level of the top of the mounting plate and thus practically forms a flat or flush continuation of the base of the mounting plate.

Furthermore, according to the invention, means are provided for additional support of the support ring between the mounting plate and the electric hotplate, which means can connect to the mounting plate and / or the hotplate or can be at a distance from one or both of these components.

Due to the described designs or other shapes, the components made of sheet metal can have a very high strength despite the small sheet thickness and can even be designed to be continuously closed without openings. For example, the shielding can be bowl-shaped in the area of one, two or more electric hot plates, thereby forming an essentially closed receiving recess for the hot plate on the bottom. At least one corresponding shape can also be provided on the mounting plate itself, in particular if it consists of sheet metal, the mounting plate then being able to be completely free of perforations in the area of the respective hotplate and, for example, an essentially closed shielding on the underside of the hotplate or forms a lower cover for the hotplate body. For ventilation from below, however, the space below the support ring can also be essentially open over its entire width at least over part of the height of the hotplate.

For the described or other assembly arrangements, it is further proposed according to the invention to provide centering means which bring about mutual centering between the hotplate on the one hand and at least one of the components surrounding it on the other hand. The surrounding component can be a shield, a lower lid essentially limited to the electric hotplate, the mounting plate itself or the like. be. In particular if this component consists of sheet metal, the centering member can be formed in one piece in a simple manner, for example, it can be designed as a freely protruding tongue with its end edge directly opposite an outer peripheral surface of the hotplate body.

The design according to the invention is particularly suitable for so-called mass hotplates, in which the electric hotplate has a hotplate body made of cast metal, the upper side of which forms the high surface and an annular outer flange edge protrudes downward over its underside with a small distance within the outer circumference of the cooking surface. Within this outer flange edge or between this and a corresponding, radially inner flange edge, for example in the underside of the hotplate body there is at least one receiving groove which is approximately parallel to the vertical surface for at least one helical heating resistor and is embedded in a pressed insulating compound. Approximately in the center or within the inner flange edge and the heating resistor, the hotplate body has a downwardly projecting pin, in which clamping means can engage for the downward tensioning of the electric hotplate or the support ring. The electric hotplate can, however, also have a different design, for example a relatively flat plate-like shape and be provided on the underside with a layered heating resistor. It is also conceivable that the electric hot plate as a heater has a tubular heater, which possibly forms the hotplate body at least partially so that the top of its tubular jacket is provided directly as a high surface. It is also conceivable to cover the plateau by means of a translucent single plate made of glass ceramic or the like. to form, on the underside of which, for example, a radiant heater is provided as heating and which is to be used as a closed structural unit with a support ring in the mounting plate.

• Fig. 1 einen Ausschnitt einer erfindungsgemäß ange­ordneten Elektrokochplatte im Vertikal­schnitt,
• Fig. 2 bis 4 weitere Ausführungsbeispiele in Darstel­lungen entsprechend Fig. 1,
• Fig. 5 ein weiteres Ausführungsbeispiel in einem gegenüber Fig. 1 noch kleineren Ausschnitt,
• Fig. 6 bis 8 drei weitere Ausführungsbeispiele in Darstel­lungen entsprechend Fig. 5,
• Fig. 9 weitere Ausführungsbeispiele in Darstellungen entsprechend Fig. 1,
• Fig. 13 bis 18 weitere Ausführungsbeispiele in Darstellungen entsprechend Fig. 5,
• Fig. 19 bis 26 weitere Ausführungsbeispiele in Darstellungen entsprechend Fig. 1,
• Fig. 27 einen Ausschnitt der Fig. 26 in Ansicht von unten,
• Fig. 28 bis 34 weitere Ausführungsbeispiele in Darstellungen entsprechend Fig. 1,
• Fig. 35 einen Ausschnitt der Fig. 34 in Ansicht von unten.

These and further features of preferred developments of the invention are evident from the claims and also from the description and the drawings, the individual features being implemented individually or in groups in the form of sub-combinations in one embodiment of the invention and in other fields, and can represent advantageous and protectable versions for which protection is claimed here. Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:

• 1 shows a detail of an electric hotplate arranged according to the invention in vertical section,
• 2 to 4 further embodiments in representations corresponding to FIG. 1,
• 5 shows a further exemplary embodiment in an even smaller section than in FIG. 1,
• 6 to 8 three further exemplary embodiments in representations corresponding to FIG. 5,
• 9 further exemplary embodiments in representations corresponding to FIG. 1,
• 13 to 18 further embodiments in representations corresponding to FIG. 5,
• 19 to 26 further embodiments in representations corresponding to FIG. 1,
• 27 shows a detail of FIG. 26 in a view from below,
• 28 to 34 further exemplary embodiments in representations corresponding to FIG. 1,
• Fig. 35 shows a detail of Fig. 34 in a view from below.

The mounting arrangement 1 according to the invention shown in FIG. 1 is used for accommodating an electric hotplate 2 in the area of an installation opening 4 of a mounting plate 3 which is substantially larger than the outer circumference of the hotplate 2 and which, for example, has a kitchen worktop, an oven recess or. the like can be. The inner circumference 5 of the installation opening 4 is expediently essentially cylindrically limited and passes through the mounting plate 3 between the top 6 and its bottom 7, the top 6 determining the generally horizontal standing plane 8 of the mounting plate 3 as a standing surface. In the exemplary embodiment shown, the top 6 is provided, following the installation opening 4, with an annular shoulder 9 which is offset by less than half the plate thickness and whose step width is larger than its step height and smaller than the plate thickness.

For at least partial support of the hotplate 2 against the occurring weight forces and in particular for the seamless, closed connection of the outer periphery of the hotplate 2 with the mounting plate 3, a support ring 10 made of thin sheet metal, in particular stainless steel sheet, is provided, which is profiled, but essentially flat annular is designed such that it lies completely below the cooking surface 24 of the hotplate 2 and above the underside 7 or the support surface formed by the annular shoulder 9 approximately in the plane of the upper, plate-shaped solid part of the hotplate 2.

The support ring 10 forms a one-piece with it, radially inner and its inner circumference limiting ring profile 11, which is open in the cross-section downwards in the shape of an annular groove or diverging downwards in a V-shape with a rounded V-tip, such that the highest profile vertex is a few millimeters is below the cooking surface 24 and possibly slightly above the stand level 8. Furthermore, the support ring 10 has a radially outer, in one piece formed with it and forming its outer circumference outer ring profile 12, which overlaps the mounting plate 3 following the mounting opening 4 with at least part of its profile width. Between the two ring profiles 11, 12, a ring profile is provided, which forms a collecting recess 13, which is formed in a flat, channel-shaped manner over the circumference in such a way that its bottom 14 is essentially continuously flat and on each side via one of more than 15 °, in particular about 45 ° outwardly inclined flank 15 or 16 passes. The width of the recess 13 is several times, in particular more than five times larger than its depth. The radially inner flank 15 is formed directly by the associated V-profile leg of the ring profile 11, while the outer flank 16 merges into an annular disk-shaped, essentially flat edge 17, which is slightly lower than the highest vertex of the ring profile 11 lying top is approximately in the level 8. The recess 13 is limited to different heights on both sides, namely radially inside higher than radially outside.

The edge 17 falls flat and obliquely outwards at a few angular degrees in the radially outer region and merges via an approximately U-shaped fold 18 into an annular, radially inwardly directed and preferably annular disk-shaped flat fold leg 19, the ring width of which is substantially smaller than the shoulder width of the Ring shoulder 9 is. This fold leg 19, which lies approximately in the plane of the bottom 14, surrounds the ring profile forming the recess 13 with a radial spacing and forms with its underside an annular disk-shaped support surface 20 for support against the mounting plate 3 or the annular shoulder 9.

In the illustrated embodiment, a prefabricated profile seal 21 made of a rubber-elastic, essentially temperature-resistant material is arranged between the support ring 10 or its outer ring profile 12 and the mounting plate 3 or the ring shoulder 9, which rests with a profile web over the entire surface of the ring shoulder 9 and has profile legs adjoining this profile web for abutment on the upright shoulder surface and on the inner circumference 5 of the mounting plate 3. The profile seal 21 can also have a short profile web engaging under the mounting plate 3 on the underside, so that it engages the mounting plate 3 against forces perpendicular to the standing plane 8 practically positively from the inside of the mounting opening 4 and is thereby also secured against movements upwards. The profile seal 21, which can be made of rubber, covers the edges towards the outside and inside essentially without a gap and forms an expansion compensation element.

The fold 18 and the fold leg 19 lie on the inner circumference of the upwardly directed profile leg and on the upper side of the profile web assigned to the annular shoulder 9 under pretension, so that the profile seal 21 is thereby secured in its installed position, namely against radial narrowing. The profile seal 21 can also be glued to the mounting plate 3 and / or the support ring 10 can also be secured by gluing to the mounting plate 3 or to the profile seal 21. The upper profile leg of the profile seal 21 expediently extends at most to the standing level 8, so that there is practically a continuously flat and essentially gapless standing area from the upper side 6 to the edge 17 or to the recess 13.

The electric hotplate 2 shown has a cast-iron hotplate body 23, the upper, essentially plate-shaped area of which forms the cooking surface 24, which defines a setting plane 25. This level 25 is approximately in the plane of the base 8 or only a few millimeters, in particular less than 10 or 7 mm or preferably even less than 5 mm above the base 8.

Compared to its largest outer periphery, which is essentially defined by the cooking surface 24, the cooking plate body 23 has a flange edge 26 which projects over its underside and which projects downwards over the underside 7 of the mounting plate 3. Within the flange edge 26 of the hotplate body 23 is provided on the underside with one or more receiving grooves 27, the bottom surfaces of which are practically formed by the underside of the plate-shaped part, adjacent spiral turns of this receiving groove 27 being separated from one another by a spiral web which is less wide than that Flange edge 26 protrudes downward. In the respective Receiving groove 27 is a helical heating resistor 28 inserted without contact and completely embedded in a pressed insulating compound 29.

The outer periphery of the flange edge 26 passes in the area of the plate-shaped part of the hotplate body 23 or approximately at the level of the bottom surface of the receiving groove 27 via a small projecting annular shoulder into an acute-angled upwardly conical connecting surface 30, on which, with a rigid position, essentially the entire surface corresponds annular connecting leg 22 of the inner profile ring 11 of the support ring 10 abuts. This truncated cone-shaped downward connecting leg 22, which has substantially the same taper as the connecting surface 30, is formed by the radially inner profile leg of the V-shaped profile ring 11 and therefore passes directly into the apex of this profile ring 11. The hotplate body 23 has, in the area of the cooking surface 24 on the outer circumference, an annular bulge 31 projecting slightly outward beyond the connecting surface 30 and having a thickness of a few millimeters, namely a thickness that is smaller than the distance between the standing plane 8 and the setting plane 25. This annular bead 31 engages over the profile ring 11 almost to the apex and is rounded off on its peripheral edge. As a result, the profile ring 11 is positively secured in both directions of the central axis of the hotplate 2, which is perpendicular to the cooking surface 24, relative to the hotplate body 23. The connecting leg 22 extends downward only approximately to the level of the base 14 or only slightly below it, so that the entire support ring 10 lies practically within the plane of the upper, plate-shaped part of the hotplate body 23.

To achieve a cover of the mounting arrangement on the underside and / or to protect heat-sensitive components, a shield 32 is provided, which is expediently formed by at least one component made of sheet metal and is in the is essentially completely below the level 8 or the underside of the mounting plate 3. In the area of the mounting plate 3, the shield 32 forms a shielding plate 33, which is located at a short distance below the underside 7 and parallel to this or the mounting plate 3, which protrude inward beyond the inner circumference 5 of the mounting opening 4 and / or is essentially sealed on the lower one Profile leg of the profile seal 21 can rest. In the area of the hotplate 2, the shield 32 formed by a one-piece component forms a shielding bowl 34 which only projects downwards relative to the mounting plate 33 and into which the hotplate body 23 engages in such a way that the flange edge 26 is at a short distance above the essentially flat key bottom lies. In the center, the bowl bottom can have a through opening for a clamping bolt or the like. have, which engages in a central pin of the hotplate body 23. Furthermore, it is conceivable to absorb at least part of the weight forces to be absorbed by the hotplate 2 by directly supporting the hotplate body 23 on the underside. The bottom of the bowl merges into the shielding plate 33 via a bowl jacket lying below the support ring 10 and flared at an obtuse angle.

In the embodiment according to FIG. 2, the shield 32a is formed by separate components, namely a shielding jacket 35 and a shielding plate 33a, which has a through opening which is relatively closely matched to the outer circumference of the shielding jacket 35 and is penetrated by the shielding jacket 35. The shielding jacket 35 forms a closed assembly with the support ring 10 and is fastened with the fold 18 thereof. For this purpose, the shielding jacket 35 has at its upper end an outwardly angled, essentially flat annular collar 36, which is clamped in a form-fitting manner between the fold legs, so that the annular collar 36 lies directly below the edge 17. The shield jacket 35 surrounds the middle, the recess 13 forming ring profile with a small distance and lies with its outer circumference directly adjacent to the inner circumference of the associated profile leg of the profile seal 21. Since the shielding jacket 35 is fully open at the lower end, the support ring 10 is appropriately ventilated from below, the lower end of the shielding jacket 35 being above the flange rim 26.

In the case of the embodiment according to FIG. 3, the separate component is formed by a shielding bowl 34a, the bottom of which lies immediately below the flange edge 26a of the hotplate body 23a, which in this case is considerably shorter and only slightly protrudes downward beyond the insulating compound 29, and via a rounded transition section in passes over the substantially cylindrical shielding jacket 35a. This is attached to the support ring 10 with the collar 36a in the manner described. The shielding plate 33a is essentially the same as in FIG. 2 and is penetrated by the shielding bowl 34a.

4, the shielding jacket 35b is formed essentially in one piece with the support ring 10b or its ring collar 36b lies in the plane of the fold leg 19b, with the two parts either merging in one piece or, for example, by butt welding, for example in the area of the fold 18b can be connected. The shielding jacket 35b can rest against the profile seal 21 with a relatively high radial pressure, so that a securing against lifting out of the support ring 10b can be achieved with a high non-positive effect.

The embodiment according to FIG. 5 essentially corresponds to that according to FIG. 1, but the profile seal 21c is essentially only angular in cross section, so that it is almost exclusively within the ring shoulder 19c and does not cover the inner peripheral surface 5c. The same profile seals 21c are also provided in the embodiments according to FIGS. 6 to 8, the rest of the support ring and the shield in the case of the embodiment according to FIG. 6 being similar to FIG. 3 and similarly in the case of the embodiment according to FIG. 7 in FIG. 2 and in the case of the embodiment according to FIG. 8 are designed similarly to FIG. 4. The installation opening can thereby have a relatively small diameter.

In the embodiment according to FIG. 9, an additional lower support is provided for the profile region of the support ring 10 lying between the ring profiles 11, 12 so that it essentially serves only to support the base 14. The support lies at a short distance below the underside of the support ring 10, so that it only strikes the corresponding weight load and deflection on the top of the support and is thereby secured. This distance can correspond approximately to the height distance between the cooking surface 24 and the upper side 6 of the mounting plate 3, so that the hotplate 2 can, with a correspondingly high weight load, sink to the level of the upper side 6 of the plate, but then not lower and therefore also particularly heavy Cooking vessels are easy to move.

The support is essentially formed by a ring-shaped support part 37 below the support ring 10, which in the exemplary embodiment shown is formed in one piece with the shielding plate 33d or the shielding jacket 35d of the shielding bowl 34d as a sheet metal profile. As a result, the shielding jacket 35d also extends upward beyond the shielding plate 33d, so that the hotplate 2 is shielded from the inner periphery of the mounting plate 3 almost completely without gaps by the shielding 32d and the support ring 10. The shielding plate 33 can have a jacket part lying directly adjacent to the inner circumference of the profile seal 21 merge into the support part 37 or, as shown, this jacket part can lie within the profile seal 21 with a larger radial distance.

In the embodiment according to FIG. 10, a centering device 38 is provided for centering the hotplate 2 or the support ring 10 relative to the mounting plate 3, the centering device 38 being located outside the center of the hotplate 2, namely on the outer circumference formed by the flange edge 26 at a distance below of the support ring 10 and the heating resistor. For this purpose, several, in particular at least three tongue-shaped centering members 39, which can be uniformly distributed over the circumference of the hotplate 2, are bent out in one piece from the jacket of the shielding bowl 34 or the shielding plate 39. The centering members 39, which lie approximately parallel to the cooking surface, are bent out with their free ends and lie with these free ends directly adjacent to the outer circumference of the flange edge 26 below the center of its height, so that they can also absorb tilting movements of the hotplate 2. All centering members 39 are expediently in a common plane. Otherwise, the configuration according to FIG. 10 essentially corresponds to that according to FIG. 1.

11 has a relatively low outer flange edge 26e, which projects below the mounting plate 3 or the shielding plate 33e with less than half of its height, while in the case of the embodiment according to FIG Embodiments according to FIGS. 1, 2, 4, 9 and 10 of the flange edge with more than half of its height protrudes accordingly. The shielding jacket 35e is configured similarly to that in FIG. 2, but is assigned to a securing device 40, with which the support ring 10 is positively secured against movements perpendicular to the mounting plate 3, namely upwards and downwards with its radially outer edge or with its supporting surface 20 is clamped down against the mounting plate 3. For this purpose, the shielding jacket 35e has safety members 41 formed in one piece with it and protruding downward over its lower ring edge in the form of tongues or tabs, of which three or more can be distributed uniformly over the circumference. The shielding plate 33e extends radially inwards beyond the inner circumference of the shielding jacket 35e so that it engages under the recess 13. In the area of each securing element 41, the shielding plate 33e has an approximately circumferentially elongated, slot-shaped securing opening 42 for pushing through the associated securing tongue, which has a narrower shaft adjoining the shielding jacket 35e and a wider head which forms the lower end in such a way that the head on both sides of the shaft forms sloping shoulders. By interlocking the securing member 41, these clamping shoulders are braced on the underside of the shielding plate 33e, so that the support surface 20 is tightened more firmly against the mounting plate 3 with increasing inclination. By turning back the head of the securing member 41, the securing device 40 can still be released again.

As shown in FIG. 12, the support ring 10f with the shielding jacket 35f or with at least part of the shield 32f can also form a closed component made of sheet metal, for example, in that the annular collar 36f with its outer peripheral edge on the support ring 10f, for example in the region of Fold 18f connects and is either formed in one piece with it or is connected by welding in such a way that the annular collar 36f forms a common, essentially annular disk-shaped component with the folded leg 19f and the support surface 20f extends approximately to the outer circumference of the shielding jacket 35f. With a correspondingly large downward load, the edge 17f of the support ring 10f on the upper side can, as in the other embodiments as well of the collar 36f or the shielding jacket 35f so that there is a safeguard against too deep deflection.

In this case, the securing device 40f is designed in the manner of a bayonet-lock connection, which can be moved into the locking position or the release position by rotating the hotplate 2 or the support ring 10f about the common central axis. For this purpose, at the lower end of the shielding jacket 35f, radially inwardly protruding securing members 41f forming bayonet locking cams are angled, to which bayonet locking openings in the shielding plate 33f are assigned as securing openings 42f. These securing openings 42f, which can be approximately angular, for example, each form a correspondingly large insertion opening for inserting the securing member 41f with one angled leg and a blocking opening section adjoining in the circumferential direction with the other angled leg, the securing member 41f and / or the securing opening the angle-limiting corner bracket can have an incline by inclination, through which an axial clamping effect is achieved. The securing member 41f can have a molded-out cam for engaging in an opening of the last-mentioned tab. The securing device also radially fixes the hotplate or the support ring.

13 corresponds essentially to that of FIG. 2, however, the profile seal 21 is provided on the inner circumference with two spaced-apart ring ribs 43, which bear under prestress on the outer circumference of the shielding jacket 35 substantially linearly and below the ring shoulder 9 on corresponding profile legs are provided. This results in a much more precisely determined system with a higher specific surface pressure.

As shown in FIG. 14, the securing device 40g can also be designed as a snap connection, the locking members 41g, which are designed as snap cams and are essentially radially resilient, are formed in one piece from the shielding jacket 35g and protrude beyond its outer circumference. The securing members 41g, which have oblique securing flanks, are intended for contact with the underside of the shielding plate 33g, specifically in the edge region of its central through opening, for the shielding jacket 35g, which in this case forms the securing opening 42g. When inserting the support ring or the hotplate into the mounting plate 3, the securing members 41g run with their cam tips against the inner boundary of the securing opening 42g, as a result of which they are resiliently pressed radially inward until they are radially outward on the underside of the shielding plate 33g spring back in the secured position.

As shown in FIG. 15, the upwardly projecting leg of the profile seal 21h can also be widened to form a head profile in such a way that it overlaps the fold 18 of the support ring 10 radially inwards at least on part of the sloping profile area or even the mounting plate 3 on the top 6 slightly overlaps.

The securing device 40g according to FIG. 16 is essentially the same as that according to FIG. 14, but the respective securing member 41g is not in engagement with the shielding plate 33a, but with the underside of the mounting plate 3, a seal 2lc according to FIG. 5 being provided is. Such a seal 21c is also provided in the embodiment according to FIG. 17, but the securing device 40g is essentially the same as in FIG. 14. The same also applies to the embodiment according to FIG. 18, the securing element in FIGS. 16 and 18 being only a little for the sake of clarity Distance from its counter surface is provided, while it actually bears against this counter surface in the assembled state under pretension.

In the embodiment according to FIG. 18, the shielding plate 33i has an upwardly projecting collar 44 which delimits its central opening and which projects upwards into the installation opening 4 of the installation plate 3 and can rest against the inner circumference 5 thereof. In the illustrated embodiment, the collar 44 is extended upward beyond the annular shoulder 9, so that it also bears on the inner circumference of the profile seal 21c. The collar 44, which lies immediately adjacent to the outer circumference of the shielding jacket 35g and forms a further shield, can be formed in one piece with the shielding plate 33i or can be formed by a separate component, which may be connected to the shielding plate 33i by welding. Its transition region, rounded in cross section, into the shielding plate 39i serves as a counter surface for the securing members 41g.

The support ring 10k according to FIG. 19 is provided in particular for hotplates 2k which, instead of a flat annular bead and a frustoconical connecting surface in the edge region, have a recessed ring shoulder which is approximately rectangularly delimited and thereby have an annular collar 31k which projects approximately radially outward at the height of the cooking surface and which approximately as thick as the plate-shaped upper part of the hotplate body 23k and lies essentially in its plane. For the connection to such a hotplate body 23k, the support ring 10k has an inner ring profile 11k, which is approximately angular in cross section, with a downwardly directed angle leg resting on the outer peripheral surface of the flange edge 26k, while the adjoining, approximately ring-shaped angle leg on the underside that formed by the collar 31k Shoulder surface. This angle leg, which projects slightly radially outward beyond the annular collar 31k, merges directly into the flank 15k.

The middle ring profile forms an approximately V-shaped recess 13k, the bottom 14k of which is rounded in the shape of a partial circle and merges tangentially into both flanks 15k, 16k. The bottom 14k of the comparatively deep collecting channel lies above the underside 7 of the mounting plate 3 and above the underside of the insulating compound which absorbs the heating resistors, but below the supporting surface and the center of the thickness of the mounting plate 3. This allows the hotplate 2k to drop comparatively low resiliently without there is a risk that any liquid caught in the recess 13k will flow back onto the cooking surface. Since the inner ring profile 11k is slightly lower than the outer ring profile 12k or the edge 17k, there could be a risk that liquid between the ring profile 11k and the hotplate body 23k gets under the support ring 10k, which is almost due to the relatively large capacity of the recess 13k is excluded. In addition, the contact of the ring profile 11k on the hotplate body 23k is expediently provided in such a way that a liquid-tight connection results.

As shown in FIG. 20, the mounting plate 3m can also have a constant thickness up to the inner circumference 5m of the mounting opening, so that a stepped ring shoulder is not necessary and the inner circumference 5m extends over the entire thickness of the mounting plate 3m with the same width. In this case, the outer ring profile 12m expediently does not have an inwardly directed folding leg, but rather is made in one layer in its radially outermost region in such a way that its circumferential edge surface formed by a cutting edge with a sharp ring edge on the upper side 6m of the mounting plate 3m with pretension is present. This ring edge is useful by a radially sloping and sloping outwards thus frusto-conical frustum-shaped ring edge is formed, which adjoins the ring-shaped rim 17m and holds it at a short distance above the top 6m. The middle ring profile forming the recess 13m and the radially inner ring profile 11m are essentially the same as in FIG. 1.

In this case, the shielding jacket 35m is fastened with a ring collar 36m to the underside of the edge 17m, for example by spot welding, in such a way that it is at a short distance from the top 6m of the mounting plate 3m and thus there is less, stroke-limited travel. The securing device 40m has radially outward molded, for example bead-shaped, resilient securing members 41 which protrude from the shielding jacket 35m and which engage behind the mounting plate 3m adjacent to the inner circumference 5m on the underside 7m. The shielding jacket 35m lies on the largest part of its length in relation to the inner circumference 5m or the mounting plate 3m without contact, so that a thermal insulation gap, which may be ventilated from below, is formed.

The situation is similar in the embodiment according to FIG. 21, in which, in addition to the securing member or members 41n on the shielding jacket 35n, at least one cam or annular bead is provided for contacting the inner circumference 5n. In this embodiment, the outer ring profile 12n of the closure or support ring 10n is formed in two layers such that two sheet-metal layers in the form of annular disks essentially lie against one another over their entire surface, the upper layer 17n and the lower layer the folded leg 19n and the annular collar 36n of the shielding jacket 35n forms. This lower layer lies essentially over the entire surface of the top 6n of the mounting plate and extends approximately to the transition of the edge 17n into the flank 16n of the recess 13n.

22, the outer ring profile 12p essentially corresponds to that according to FIG. 2, but the ring collar 36p or the shielding jacket 35p is not, as in the embodiment according to FIG. 2, made of sheet metal material which is essentially the same thickness as the supporting ring 10p, but instead consists of a much thinner sheet, which, like a spring sheet, can have a steeply rising spring characteristic and is expediently only a few tenths of a millimeter thick. The securing device 50p with spacers for the inner circumference of the mounting plate 3p corresponds to that according to FIG. 21.

The support ring 10m according to FIG. 23 corresponds essentially to that according to FIG. 20, but the mounting plate 3 is provided with a stepped ring shoulder on which the support ring 10m also with its central ring profile, namely with the outer region adjoining the flank 16m of the bottom 14m of the depression 13m is seated directly. The outer ring edge 19m overlaps this ring shoulder 9, which is narrower and less deep than in FIG. 1, and rests on the upper side 6 of the mounting plate 3 in a manner similar to that in FIG. 20. As a result, a stepped or appropriately profiled ring gap is formed between the ring shoulder 9 and the top 6 on the one hand and the flank 16m and the outer ring profile 12m on the other hand, which is at least partially filled with a sealing adhesive 45. The shielding jacket 35m can rest with an annular collar on the annular shoulder 9 or in the manner of a collar-free sleeve with its upper end face on the underside of the supporting ring 10m, in particular on the bottom 14m by welding or the like. be attached.

24 corresponds to that according to FIG. 21, but the mounting plate 3 has an annular shoulder 9 which is narrower than the outer annular profile 12n or about half as narrow and which is filled with the adhesive 45 or the seal.

The support ring 10p according to FIG. 25 including the shielding jacket 35p corresponds to that according to FIG. 22, but here too the mounting plate 3 with an annular shoulder 9 for receiving the adhesive 45 or the like. provided, the folding leg 19p extends only over an outer part of the width of the adhesive 45, so that this is exposed in the radially inner region, if necessary, for the elastic stop of the edge 17p.

As shown in FIGS. 26 and 27, the mounting plate 3r can also be made in one piece with the shield 32r from sheet metal or another suitable material, so that, for example, the shielding bowl 34r with its shielding jacket 35r is molded directly onto the mounting plate 3r. Appropriately, the support ring 10r lies with its outer ring edge 19r at a radial distance within with its flank 16r on an upper side of the mounting plate 3r, preferably at the transition between the latter and the shielding jacket 35r in the manner of a centering, so that a very simple alignment the hotplate 2r opposite the installation opening. The shield 32r is formed in one piece with the centering device 38r, which in this embodiment forms four short centering members 39r which are evenly distributed over the circumference and whose ends lie directly adjacent to the outer circumference of the flange edge 26r. In Fig. 26, two further design variants are indicated below the shield 32r, of which the upper at the lower end of the shielding jacket forms an inwardly angled, narrow and at a relatively large distance from the flange edge 26r, while the lower forms a shield has jacket, which is also open at the bottom to its full width, so that there is a relatively good ventilation below the support ring 10r.

As shown in FIG. 28, the shield 32s can also completely accommodate the hotplate 2s in such a way that the bottom of the shielding bowl 34s lies directly below the flange edge 26s. The shielding bowl 34s has a bowl base which is curved in cross section, concave at the top and decreasing radially outward in the radius of curvature, as a result of which the mounting plate 3s is stiffened, so that it can be produced from very thin material. The support ring 10s essentially corresponds to that according to FIG. 20.

The outer ring profile 12t of the support ring 10t according to FIG. 29 is designed similarly to that according to FIG. 1, but the folded leg 19t lies directly against the top of the mounting plate 3t without an intermediate layer. This passes over a conical intermediate section 9t into the shielding jacket 35t, the taper of the intermediate section 9t corresponding to that of the flank 16t of the support ring 19t, so that this flank 16t can be relatively directly centered on the intermediate section 9t.

In the embodiment according to FIG. 30, two or three spaced-apart shielding parts of the shield 32u are again provided, the innermost shielding part being formed practically by the central ring profile of the support ring 10u, namely by the boundaries of the recess 13u. The outermost shielding part is provided as a shielding jacket 35u formed in one piece with the mounting plate 3u, and the middle shielding part is formed by the shielding bowl 34u, which is inserted with its ring collar 36u into the outer ring profile 12u of the support ring 10u. This annular collar 36u merges into the shielding bowl 34u via a conical intermediate section, this conical intermediate section cut on the one hand abuts the transition between the shielding plate 3u and the shielding jacket 35u and on the other hand the flank 16u is supported on it in the manner described with reference to FIG. 29.

In the case of the embodiment according to FIG. 31, the mounting plate 3v made of sheet metal forms an annular shoulder 9v by suitable deformation for receiving the angular profile seal 21v and the outer ring profile 12v of the supporting ring 10v, the bottom part of this annular shoulder 9v being similar to the second in a shielding jacket 35v Embodiment variant according to FIG. 26 passes over. This shielding jacket 35v is surrounded on the outer circumference by a further shielding part, namely the jacket of the shielding bowl 34v, which is attached with its ring collar 36v to the underside of the bottom part of the ring shoulder 9v, for example by spot welding, so that a correspondingly localized configuration of this bottom part is achieved by a double-layered design Stiffening is achieved.

The mounting plate 3w according to FIG. 32 is designed in the area of the installation opening similarly to the embodiment according to FIG. 31, but there is a further shielding jacket 35w within the jacket part adjoining the annular shoulder 9w, which is connected to the outer ring profile with its annular collar 36w 12w of the support ring is used low. As a result, the shielding jacket 35w can be assigned a securing device 40w designed in the manner of a self-engaging snap connection, which advantageously has hook-shaped latching bolts as securing members 41w, with which security openings 42w are associated in an inwardly angled collar of the jacket part of the mounting plate 3w.

In the embodiment according to FIG. 33, the shield 42y is again designed similarly to that according to FIG. 28, but the shield is in the transition region between the jacket bowl 34y and the actual useful part of the mounting plate 3y a recessed ring shoulder 9y for receiving the outer ring profile 12y of the support ring 10y is provided. This annular shoulder 9y can have a width that is smaller compared to the width of the ring profile 12y or only slightly larger than the width of the support surface, or it can, as indicated by dash-dotted lines in FIG. 33, the bottom 14y at least over part of its width or approximately to Reach under the inner ring profile 11y at a short distance and only pass into the bowl shell close to the outer circumference of the ring flange 26y. This results in a support part 37y which is directly connected to the mounting plate 3y or is formed in one piece therewith.

In the case of the embodiment according to FIGS. 34 and 35, two pot-shaped or bowl-shaped shielding areas or shielding parts, one above the other, are provided, of which the upper one directly connects with its jacket to the annular shoulder 9z, while the lower shielding bowl 34z with its annular collar 36z to the underside of this upper shielding part, namely at a distance within its outer circumference to the bottom underside. In addition, in the upper area of the shielding 32z adjoining the support ring 10z, two substantially coaxially interlocking shielding parts are provided, of which the outer part is formed by the jacket of the upper, pot-shaped shielding part and the inner part is formed by a shielding jacket 35z, which is similar to that shown in FIG. 4 connects to the support ring 10z. This shielding jacket 35z forms, at the lower end, as securing members 41z, bending tabs which, immediately adjacent to the outer circumference of the annular collar 36z, pass through securing openings 42z in the bottom of the upper pot-shaped shielding part and are angled below this bottom for securing purposes. A centering device 38z with centering members 39z is similar to that according to FIGS. 26 and 27 formed by the bottom of the upper pot-shaped shielding part, which lies slightly above the center of the height of the flange edge 26z.

1 to 35, the same reference numerals are used for corresponding parts, but with different letter indices, which is why corresponding description parts apply to all associated figures. The individual described ring profiles of the support rings as well as parts thereof can be combined as desired in further embodiments, so that further exemplary embodiments result. This also applies to the mounting plate, which can be composed, for example, of the described glass ceramic and sheet metal parts in the area of the ring shoulder, for the described parts of the shields, the centering and securing devices and the profile seals. The fact that the support ring is formed in one piece from its radially innermost boundary or from its directly touching transition into the hotplate body to its radially outermost limit, results in a continuously smooth and edge-free, but profiled upper side of the support ring as a connection between the outer circumference of the hotplate body and the mounting plate, so that, despite the formation of a recess on joints, openings or the like. can be completely dispensed with and yet the cooking surface only protrudes about 1 to 2 mm above the top of the mounting plate or even lies approximately in the plane of the top of the mounting plate. Thermal expansions and strain deformations are reversibly absorbed by this support ring and, in addition to the shielding between the hotplate body and the mounting plate, the supporting ring may also form a heat radiator, for example in such a way that it only at a temperature of about 400 ° C. in the area of the hotplate body in the area of the mounting plate still about half as high Temperature of the order of about 200 ° C, for example. The support ring can form the only support for the hotplate with respect to the mounting plate.

The design according to the invention is also advantageously suitable for grounding the support ring, the centering or shielding jacket and / or other metallic components outside the hotplate body. 1 shows a grounding part 46, for example formed by a sheet metal strip, which is connected in a manner not shown to the grounded hotplate body 23 in an electrically conductive manner, for example, in that it is screwed to its central pin. This grounding part 46 is guided on the underside of the hotplate body 23 radially to its outer circumference and is connected there in an electrically conductive manner to the supporting ring 10 via at least one grounding lug 47 or 48, for example, which is formed in one piece with it and is also indicated by broken lines. The tab-shaped or strip-shaped earthing lug 47 is guided obliquely upward from the underside of the outer flange edge 26 to the outer ring profile 12 of the support ring 10 and is connected to it, for example, in the same way as explained with reference to the ring collar 36 in FIG. 2. Instead of or in addition to this, the earthing lug 48 can also be guided upwards along the outer circumference of the flange edge 26 and connected to the support ring 10 in the region of the inner ring profile 11. The earthing lug 48 can be formed in one piece with the support ring 10, for example, by forming a continuation of the connecting leg 22 thereof. If the support ring 10 is punched out of sheet metal in a ring, the grounding lug 48 does not require any additional material because it can be practically formed from the punching waste to be punched out to form the ring opening.

As FIG. 1 also shows, instead of or in addition to this, an earthing lug 49 can also be provided for earthing the shield 32. This earthing lug 49, which can also be connected at one end to the outer ring profile 12 in the manner described and can be guided downward along the seal 21, penetrates, for example, the shielding plate 33 in the region of an opening adapted to it and is radial below the shielding plate 33 angled outwards and fastened with the leg thus formed on the underside of the shielding plate 33, for example with a screw. Due to the positive engagement of the earthing lug 49 in the shield 32 in the circumferential direction of the hotplate 2 and by its rigid connection to the support ring 10, the earthing lug 49 simultaneously forms an anti-rotation device for the support ring 10 and thus for the hotplate 2 relative to the installation trough formed by the shield 32 and thus relative to the mounting plate 3. It is also conceivable to distribute two or more such earthing lugs 49 or anti-rotation elements essentially uniformly over the circumference of the support ring 10 or the hotplate 2.

2, a grounding flag 49a is indicated by dash-dotted lines, which is attached with an upward-pointing leg to the inner circumference of the shielding jacket 35, for example by spot welding, and with its other leg also on the underside of the shielding plate 33a with a screw or the like. is set. However, this earthing lug 49a can also be formed in one piece with the shielding jacket 35, so that it starts from the lower ring edge thereof. Furthermore, in addition to this or instead of this, a grounding flag could be connected to the shielding jacket 35 or to the shielding plate 33a, which runs along the underside of the hotplate body and, as explained with reference to the grounding part 46, is electrically conductively connected to the hotplate body is. This earthing lug can also be connected to the inner circumference of the shielding jacket 35 or to the shielding plate 33a by spot welding.

Said anti-rotation device does not necessarily have to be structurally combined with an earthing lug, but it can also be formed in the case of the embodiment according to FIG. 1 by an angular tab, the angular shape of which corresponds to the cross section of the shielding jacket 35 shown in FIG. 2. The upper leg of this tab is then, as described with reference to the earthing lug 49, connected to the support ring 10, while the downward-pointing leg, which is essentially straight to its lower end, passes through the shield 32 in the manner described. To prevent rotation, it is also conceivable to provide a protruding anti-rotation element 50 on the shielding plate 33a, which is expediently formed in one piece with the shielding plate and is indicated by dash-dotted lines in FIG. 3. This anti-rotation element 50, of which several can be provided evenly distributed over the circumference, engages approximately radially inwardly protruding into an opening in the shielding jacket or in the shielding pot, this opening, not shown in detail, being appropriately closely adapted in the circumferential direction to the anti-rotation element 50 . In a plan view of the hotplate or in the direction in which it is to be inserted into the mounting plate 3, said opening is expediently so large that it protrudes beyond the free end of the anti-rotation element 50, which can be achieved in a simple manner, that the opening from the top of the anti-rotation member 50 down into the rounded transition area between the shielding jacket 35a and the bottom of the shielding pot 34a is extended accordingly. As a result, the anti-rotation element 50 and the associated securing opening can only be brought into and out of engagement by a relative movement approximately at right angles to the mounting plate 3. In the case of the training according to Fig. 2 would such a tab-shaped anti-rotation element engage in a centering opening of the shielding jacket 35, which starts from the lower longitudinal edge thereof. 1 are also provided in the embodiments according to FIGS. 11, 12, 32 and 34 and are also conceivable in the other embodiments. This also applies to the earthing described.

Claims (13)

1. Electric hotplate, characterized in that it is assigned a recording determining its position of use. 2. Electric hotplate according to claim 1, with a setting plane (25) determining the cooking surface (24) on the top of a hotplate body (23) and with a support plane (20) on the underside with a support plane (13) determining support plane for support at the opening edge a mounting plate (3) provided for receiving the hotplate (2) and with its upper side (6) defining a standing plane (8), the support ring (10) passing through between the hotplate body (23) and the support surface (20) essentially in one piece , characterized in that the support ring (10) between the hotplate body (2) and the support surface (20) has an essentially annular collecting recess (13) extending over its circumference. 3. Electric hotplate according to claim 1 or 2, characterized in that the support ring has a radially inner inner ring profile (11) for connection to the hotplate body (23) and a radially outer outer ring profile (12) with the support surface (20), that in particular the collecting recess (13) adjoins a profile flank (15 or 16) of at least one ring profile (11, 12) or the width of the collecting recess is substantially larger to at least twice as large as its depth and / or that the collecting recess (13) is of flat-shell shape to approximately rectangular V-shaped in cross section, so that the support ring (10) in the region of the deepest zone of the recess (13) preferably at most up to the level of the underside of the mounting plate (3) or half the height of the hotplate body (23) is sufficient and that in particular the recess (30) is delimited by gently rising flanks (15, 16). 4. Electric hotplate according to one of the preceding claims, characterized in that at least one further support is provided for the underside thereof, preferably the bottom (14) or one, in the radial distance within the outer circumference of the supporting ring (10 or 10m or 10r) Flank (16m, 16r) is assigned to the recess and / or that a shield (32g) is provided for the inner circumference of the installation opening of the mounting plate (3) and in particular is provided with at least one securing element (41g), preferably for the outer circumference of the hotplate ( 2) or the underside of the mounting plate (3) and / or the hotplate (2) at least one shield (32f) is provided, in particular especially at least partially connected to the support ring (10f) and / or penetrated by the securing member (41f) or designed as a shielding bowl (34 or 34z) and at least approximately to the underside of the component forming the mounting plate (3 or 3z) enough. 5. Electric hotplate, in particular according to one of the preceding claims, characterized in that the support ring (10, 10f, 10m, 10w, 10z) at least one position securing device (40, 40f, 40m, 40w, 40z) with at least one securing member (41 , 41f, 41m, 41w, 41z) for easily releasable securing against lifting off from the mounting plate (3, 3m, 3w, 3z) and that the securing member (41f, 41z) is essentially in one piece with the support ring and / or as a resilient snap member , Bending tab, locking cams or the like. formed and in particular is arranged substantially below the underside of the support plate. 6. Electric hotplate according to one of the preceding claims, characterized in that the support ring (10f or 10p) in the region of the support surface (20f) is at least double-layered and in particular that the lower ring layer of the support ring merges into a downwardly directed sleeve part and / or receives a downwardly directed sleeve part between itself and the upper ring layer, the securing member (41f) preferably being associated with the sleeve part. 7. Electric hotplate, in particular according to one of the preceding claims, characterized in that the support plate (3), in particular made of a ceramic material, such as glass ceramic, for receiving the support surface (20) of the support ring (10) is preferably offset in relation to its thickness , deepened Has annular shoulder (9), which is designed in particular for receiving a profile ring seal (21) provided for supporting the supporting ring (10), which preferably lines the annular shoulder (19) essentially completely or angularly and / or edges of the mounting plate or the support ring covered. 8. Electric hotplate according to one of the preceding claims, characterized in that at least one shield (32) is formed as a separate component from the hotplate (2) and in particular essentially in one piece or as a self-contained assembly under the hotplate (2) and the Mounting plate (3) passes through that at least one shield (32y) for the hotplate (2y) essentially in one piece with the mounting plate (3y) made of sheet metal or the like. is formed and / or that at least one shield for the underside of the hotplate (2a) forms an in particular one-part component with a jacket part passing through the installation opening and connected to the support ring. 9. Electric hotplate according to one of the preceding claims, characterized in that at least one additional support is provided for the support ring (10) between the support surface (20) essentially adjoining its outer circumference and the hotplate (2), and in particular by at least one support projecting upwards Supporting part (37) of the shield (32d) is formed and / or for the hotplate (2r) at least one centering member (39r) is provided, which is directed in particular against the outer circumference of its outer flange edge (26r) and is possibly formed out of the shield (32r) is, preferably a plurality of centering members (39r) distributed over the circumference in the form of freely projecting centering tongues or the like. are provided. 10. Electric hotplate according to one of the preceding claims, characterized in that the level (25) of the hotplate (2) is substantially only one to a few millimeters above the standing level (8) of the mounting plate (3) and that in particular the inner ring profile (11) forms the highest area of the support ring (10), the mounting plate (3 or 3s) preferably being formed at least partially by a solid plate made of non-metallic material, such as wood, glass, ceramic or the like, and / or consists at least partially of sheet metal. 11. Electric hotplate according to one of the preceding claims, characterized in that the support ring (10m) with respect to the mounting plate (3) is at least partially secured by gluing, preferably between the outer ring profile (12m) of the support ring (10m) and the mounting plate (3rd ) an adhesive (45) is provided. 12. Electric hotplate according to one of the preceding claims, characterized in that for the hotplate (2) or the support ring (10) an anti-rotation device is provided with respect to the receptacle, in particular with respect to the shield (32), preferably one with the support ring (10th ) non-rotatably connected securing part is in engagement with an anti-rotation element (50) of the shielding plate (33a). 13. Electric hotplate according to one of the preceding claims, characterized in that directly on the support ring (10) and / or on the shield (32a) an earthing part or the like by welding. is attached, preferably at least one earthing lug (47, 48, 49 or 49a) being electrically conductively connected to the hotplate body and / or to the shield (32 or 32a).

Images