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EP0283591B1 - Plaque de cuisson électrique, dispositif et méthode de montage d'une tôle de protection sur la plaque - Google Patents

Plaque de cuisson électrique, dispositif et méthode de montage d'une tôle de protection sur la plaque Download PDF

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Publication number
EP0283591B1
EP0283591B1 EP87119412A EP87119412A EP0283591B1 EP 0283591 B1 EP0283591 B1 EP 0283591B1 EP 87119412 A EP87119412 A EP 87119412A EP 87119412 A EP87119412 A EP 87119412A EP 0283591 B1 EP0283591 B1 EP 0283591B1
Authority
EP
European Patent Office
Prior art keywords
cover plate
pin
hotplate
electric hotplate
fixing means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87119412A
Other languages
German (de)
English (en)
Other versions
EP0283591A3 (en
EP0283591A2 (fr
Inventor
Robert Kicherer
Felix Schreder
Stefan Reif
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT87119412T priority Critical patent/ATE66730T1/de
Publication of EP0283591A2 publication Critical patent/EP0283591A2/fr
Publication of EP0283591A3 publication Critical patent/EP0283591A3/de
Application granted granted Critical
Publication of EP0283591B1 publication Critical patent/EP0283591B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/70—Plates of cast metal

Definitions

  • the invention relates to an electric hotplate with a hotplate body, which has a central, downwardly projecting pin, and with a cover plate covering its underside, as well as a device and a method for its attachment.
  • the object of the invention is to provide an electric hotplate, a device and a method in which the fastening of the cover plate, taking into account the automatic manufacture in mass production, can be carried out in a particularly cost-effective manner and yet safely without the advantages of a hotplate without being on the underside protruding fasteners need to be dispensed with in terms of storage and transport.
  • an electric hotplate in which the cover plate is fixed by a screwless, metallic fastening means which is provided between the outer surface of the pin and a recess of the cover plate which surrounds the pin and which locks in a resilient and / or form-fitting manner.
  • the fastening means can be a preferably barb-like claw, a snap-in or, particularly preferably, a securing means by means of protrusions that pass through Notches of the edge region of the pin are formed.
  • the cover plate can be deformed using the pin as a patrix during the pressing-on process to form a nozzle-like collar which bears against the outer surface of the pin and guides it, so that the notches are only a backup.
  • the fastening means can also consist of gripping edges formed in one piece from the cover plate, which are resiliently caulked like barbs on the outer surface of the pin.
  • the normally cast-rough surface of the pin advantageously contributes to this if the hotplate body is preferably made of cast metal.
  • a recess e.g. a circumferential groove can be provided, into which the fastening means snaps.
  • the fastener can consist of individual elements protruding inwards on the pegs, which run radially or star-shaped inwards, i.e. are separated from each other by incisions. These can spring individually and act like a self-locking wreath of barbs when pressed onto the pin.
  • a central pin several pins provided in central hotplate areas could also be provided.
  • bent tabs on the cover plate in the advantageously cup-shaped fastening area which grip the lower end face of the pin and on the one hand form an end stop when the cover plate is pressed on and on the other hand bring about a final fixing of the cover plate independently of the screwless fastening described , when a clamping bracket, part of the hob or the like is finally pressed against it by screwing into a central threaded hole of the pin.
  • a preferred device for attaching a cover plate has a press-in tool, with which the cover plate can be moved against the pin and whose press-in elements surrounding the pin carry out a corresponding deformation of the cover plate.
  • This deformation can be plastic in part, but should leave a residual elasticity to maintain the self-holding effect.
  • Fig. 1 shows an electric hotplate 11, which is installed in a mounting plate 12 of a built-in hob 33, which in turn is inserted into the opening of a worktop 34 of a kitchen furniture.
  • the electric hotplate engages in an opening 13 of the built-in plate 12 and is supported with built-in rings 17 on a raised rim 14 of the built-in plate.
  • the hotplate body 16 is made of cast metal, preferably cast iron, and has a flat, ring-shaped cooking surface 15 which surrounds a somewhat recessed, unheated central zone 23.
  • a The outer edge 18 of the hotplate body extends essentially cylindrically downward and carries the mounting ring 17 on the outside, supported by a flange.
  • a cover plate 27 rests on its underside and leads on the inside of the outer edge with a circumferential cylindrical surface which defines the outside an indentation 50 formed in a ring.
  • the heating of the electric hotplate is effected by helical heating resistors 22 which lie in spirally arranged grooves 21 on the underside of the hotplate body in a heated ring zone 19 which is delimited inward by a downward inner edge 20.
  • the heating resistors are embedded in an electrically insulating investment.
  • a cast-on central pin 24 is provided, which projects approximately as far down as the outer edge 18 and tapers downward somewhat (in the order of magnitude of the draft angle). It has a central threaded bore 25 into which a fastening screw 26 can be screwed, which clamps the hotplate against a lower clamping fastening plate 33.
  • a separate clamping bracket or other fastening means can also be provided, which are supported, for example, in the area of the coaming rim 14.
  • a screwless fastening means 52 is provided in the area of the cover plate surrounding the pin 24.
  • this central region is provided with a cup-shaped, upward-pointing shape 53, the upward-pointing bottom of which has an opening which corresponds to the outer cross-sectional shape of the pin 24 at the corresponding point, but is somewhat smaller.
  • gripping edges 54 which are directed toward the outer surface 55 of the pin and engage in a self-locking manner when the fastening means are pressed together with the cover plate onto the outer surface of the pin 24.
  • FIGS. 3 to 5 show a preferred, slightly modified embodiment, in which the fastening means 52 are formed by elements which are separated from one another by cuts. These incisions are approximately triangular and not very deep, so that there is a form of knurling or an inward star, the tips of which form the gripping edges 54. There are four sections 57 in the form of the upwardly bent tabs. It can also be seen that the pin 24 in this embodiment has a flat 58 which is formed by a substantially vertical plane. The opening between the fasteners is adapted to this shape, so that this also results in an anti-rotation device.
  • Fig. 3 it can be seen that the fastening means 52 are not, as in Fig. 1, provided on the (top) bottom of a cup-shaped configuration, but only a relatively flat groove-shaped depression is provided.
  • Fig. 4 and 5 shows their shape after attachment. It can be seen that the expression 53 is only so deep that the gripping edges 54 still come to lie on a cylindrical or slightly conical part of the outer surface, that is to say above a possible rounding or the like.
  • the cover plate 27 is embossed into the shape shown in Fig. 3, e.g. a flat shape 53 is made and the opening 59 is punched therefrom, the star-shaped structure being produced with individual elements 60 of the fastening means and at the same time the tabs which later form the support sections 57 are formed and brought into their basic shape.
  • the clear dimensions of the opening 59 i.e. the distance between the tips 54 of the elements 60 is smaller than the corresponding outer dimensions of the pin 24.
  • a press-in device shown in FIGS. 3 and 4 contains a press-in tool 61 in the form of a stamp, which can be advanced by means of a power drive 62 against the underside of the hotplate.
  • the insertion tool 61 has a spring-loaded central guide pin 63 which interacts with the threaded bore 25 and the tool at Pressing positioned to the hotplate, and pressing elements 64, which are arranged in a ring around the position provided for the pin and have a cam-like shape in cross section.
  • fastening means 52 that is to say the parts of the cover plate immediately adjacent to the edge of the opening 59 and thus on the elements 60, when pressed onto the pin inward and can tilt at the bottom so that they take on a barb-like shape.
  • the slope 65 should be such that, taking into account all the tolerances of the cover plate and the pin, the fastening element does not lie completely against it when it is pressed on. Due to this locking angle a measured between fastening means 52 and outer surface 55, which can be seen in FIGS.
  • FIGS. 8 shows a modified design of the fastening means 52, which in this case are projecting tabs separated from one another by incisions, so that the gripping edges 54 have the shape of circular segments and not, as in the embodiment according to FIGS. 2 to 5, tips.
  • This embodiment is preferred for harder sheet materials and in the case when the pin 24 can have larger dimensional deviations because the longer, trapezoidal elements 60 create a greater elastic reserve.
  • the cover plate When attaching the cover plate, it can be positioned correctly in relation to the hotplate.
  • the positioning of the rotational position is ensured in the automatic handling of the hotplates by the recess 31 in the edge, into which part of a mounting device engages.
  • the cover plate When the cover plate is pressed on, the corresponding recess 32 engages in the edge of the end cover, so that the end cover is also immediately fixed in the direction of rotation (possibly in addition to the securing by the flattened portion 58), but this could also be omitted.
  • a recess 66 in the form of a circumferential groove is provided in the pin 24, which can be carried out, for example, by means of a plunging tool when turning off the end face 56 or when drilling and tapping for the bore 25.
  • the cover plate is similar in shape to that of FIG. 1 and engages with its fastener when pressed into the groove 66 and is securely positively fixed there.
  • this version requires a certain amount of extra work when machining the hotplate body, it ensures a clear one and secure location.
  • a horizontal incision could also be provided, in which only part of the fastening means engages.
  • the fastening means would be designed in such a way that the cover plate can largely be pushed on without deformation and protruding fastening sections run into the groove by relative rotation of the cover plate.
  • the cover plate could then be brought with its recess 32 at the edge to snap into the recess 31 of the edge, so that a return rotation into the insertion position, which is necessary for the solution, is no longer possible without further ado.
  • this embodiment requires that the cover plate and hotplate body can be rotated against each other by a certain angle without this being impeded by connecting parts, for example the power supply lines.
  • a fixation would be possible without significant deformation of the cover plate.
  • application by simple axial compression, as described is preferred.
  • a particularly simple screwless fastening is created by the invention, which is ideally adapted to the conditions.
  • the cover plate is fixed without the need for separate fastening means and can be additionally secured by the support sections 57 during later installation.
  • the still simplest and most reliable method of fastening the electric hotplate to the stove by means of a bolt 26 can be maintained unchanged, and only a simple standard cap screw is required. If the burr created during punching is used to form an additional edge or cutting edge, which helps to improve the hold.
  • the punching should therefore be carried out in such a way that the punching ridge 67 is formed on the edge which can preferably penetrate into the material, for example the upper (inner) edge of the cover plate in the region of the opening 59 (FIGS. 6 and 7).
  • the depth of the expression 53 can vary depending on the shape of the cover plate of the pin. Possibly. the resulting cylindrical section of the shape can contribute to influencing the rigidity or elasticity of the fastening means.
  • FIGS. 10 to 12 corresponds in all parts, which are also provided with the same reference numerals, like the previous ones, to the embodiments already described, with the exception of the following changes:
  • the recess 53 and the opening 59 are provided in the cover plate and are a circular opening with a smaller diameter than that of the end face 56 of the pin 24, into which three tabs 45 protrude. This shape before attachment can be seen in Figure 11.
  • the center region of the cover plate 27 is deformed into a shape by means of an indentation tool 61 with the aid of the pin 24 as a mold-like tool half, which can be seen from FIG. 12.
  • the groove 53 is formed, from which the tabs extend at an angle to the end face 56 and form support sections 57 there.
  • the portions of the cover plate which bear against the outer surface 55 of the pin 24 are in the form of a nozzle-like shape which is shaped downward in the manner of a collar 79 formed, which rests largely flat on the outer surface 55 and does not necessarily have a self-locking effect, although there is quite a good hold in cooperation with the rough cast surface.
  • the notches 71 lie obliquely in the region of the peripheral edge 74 of the journal which connects the lateral surface 55 to the end surface 56 and each produce a projection 75 which projects beyond the lateral surface 55 and which secures the cover plate in the region of the formation 70 against being pulled off the journal. It has been found that this type of connection, in which the main fixing is preferably carried out by the formation 70 and only by means of the protrusions 75 against being pulled off, that the protrusions 75 can be very small, is possible, although in itself the casting material of the hotplate body Large-scale deformations are not permitted. This is possible with the striking tools.
  • cover plate is mostly provided on both sides, but in any case on the upward-facing inside with a thin aluminum coating or cladding 76.
  • the aluminum which is a softer metal than the steel sheet from which the cover sheet 27 is made, forms a smear layer during the deformation, which prevents the steel sheet from seizing on the spigot and thus contributes significantly to a crack-free and perfect deformation.
  • the aluminum coating of the steel sheet also has the advantage that an intermetallic connection between the aluminum and the steel creates a protective layer against corrosion when heated.
  • This version with a continuous, uninterrupted formation 70 has the advantage that the cover plate in the region of the pin 24 closes tightly, so that the space between the hotplate body and cover plate can also be kept largely sealed and thus protected from moisture.
  • the aluminum coating also contributes to this because it has adapted to the surface structure of the pin during the deformation.

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  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Baking, Grill, Roasting (AREA)
  • Cookers (AREA)
  • Packages (AREA)
  • Connection Of Plates (AREA)
  • Table Devices Or Equipment (AREA)
  • Resistance Heating (AREA)
  • Motor Or Generator Frames (AREA)
  • Electric Stoves And Ranges (AREA)

Claims (17)

  1. Plaque de cuisson électrique comportant un corps (16) de plaque de cuisson, qui comprend un téton central (24) saillant vers le bas, et comportant une tôle (27) de protection, recouvrant la face inférieure de la plaque (11) de cuisson, sur laquelle est fixée ladite tôle, caractérisée n ce que la tôle (27) de protection est arrêtée au moyen d'un dispositif métallique (52) de fixation sans vis, agencé entre la face extérieure (55) du téton (24) et une ouverture (53, 59) de la tôle (27) de protection, qui entoure le téton (24), ce dispositif assurant l'arrêt de façon élastique et/ou par engagement positif géométrique.
  2. Plaque de cuisson électrique selon la revendication 1, caractérisée en ce que le dispositif (52) de fixation peut être mis en place par une pression dirigée vers le haut, dans le sens du téton (24), appliquée sur la tôle (27) de protection.
  3. Plaque de cuisson électrique selon une des revendications 1 ou 2, caractérisée en ce que des saillies (75) assurant le maintien de la tôle (27) de protection sont réalisées sur le téton (24) el sont formées par des encoches (71) taillées par le bas dans la zone périphérique de la face frontale inférieure (56) du téton.
  4. Plaque de cuisson électrique selon une des revendications 2 ou 3, caractérisée en ce qu'il est prévu une partie (70) de la tôle (27) de protection, cette partie ayant la forme d'une tuyère, qui est réalisée lors de l'emmanchement de la tôle (27) de protection sur le téton (24) et enveloppe le téton (24) de façon étanche.
  5. Plaque de cuisson électrique selon une des revendications précédentes, caractérisée en ce que la tôle (27) de protection est revêtue, du moins du côté opposé à la plaque de cuisson (11), d'une couche (76) d'aluminium.
  6. Plaque de cuisson électrique selon une des revendications précédentes, caractérisée en ce que le dispositif élastique (52) de fixation, qui est réalisé de la même matière que la tôle (27) de protection, comporte au moins un bord (54) d'agrippage pourvu, s'il y a lieu, d'une arête de découpage, ce bord étant prévu à la périphérie de l'ouverture (53, 59) dans la tôle (27) de protection.
  7. Plaque de cuisson électrique selon une des revendications précédentes, caractérisée en ce que le dispositif (52) de fixation s'engage dans un retrait (66), et de préférence dans une gorge située dans la face extérieure (55) du téton (24).
  8. Plaque de cuisson électrique selon une des revendications précédentes, caractérisée en ce que le dispositif (52) de fixation est constitué d'une série d'éléments (60) saillant vers l'intérieur, vers le téton (24), séparés les uns des autres par des encoches réalisées dans la périphérie de l'ouverture (53, 59).
  9. Plaque de cuisson électrique selon une des revendications précédentes, caractérisée en ce que l'ouverture (53, 59) se compose d'une partie de la tôle (27) de protection exécutée en forme de cuvette inversée et d'une ouverture (59) prévue dans cette partie en cuvette inversée, et en ce que le dispositif (52) de fixation est disposé à la périphérie de l'ouverture (59), le dispositif (52) de fixation et la surface extérieure (55) du téton (24), qui s'effile de façon légèrement conique, étant conjugués comme un système à crampons après la mise en place du dispositif (52).
  10. Plaque de cuisson électrique selon une des revendications précédentes, caractérisée en ce que des pattes (57) d'appui de la tôle (27) de protection sont prévues au niveau de l'ouverture (53, 59), qui s'engagent sous une surface frontale inférieure (56) du téton (24), pourvue d'un trou fileté central (25), qui sont de préférence des languettes formées à la périphérie de l'ouverture (59) et s'étendent le long de la face extérieure (55) du téton (24), vers la surface frontale (56).
  11. Plaque de cuisson électrique selon une des revendications précédentes, caractérisée en ce que le téton (24), qui, dans l'ensemble, est rond, possède un méplat (58) qui se conjugue avec des parties correspondantes réalisées dans l'ouverture (53, 59), afin de constituer un frein interdisant la rotation.
  12. Plaque de cuisson électrique selon une des revendications précédentes, caractérisée en ce que la tôle (27) de protection repose, à sa périphérie, sur l'arête inférieure d'un bord extérieur (18), qui est prévu à la périphérie du corps (16) de la plaque de cuisson et est dirigé vers le bas, et que la tôle s'engage, de préférence, par l'intermédiaire d'une partie (32) emboutie vers le haut, réalisée dans le bord de la tôle de protection, dans une encoche (31) pratiquée dans l'arête inférieure (28).
  13. Plaque de cuisson électrique selon une des revendications précédentes, caractérisée en ce que le dispositif (52) de fixation est un verrouillage à baïonnette bloqué par un mouvement relatif entre la tôle (27) de protection et la plaque (11) de cuisson.
  14. Dispositif permettant l'installation d'une tôle (27) de protection sur un téton central (24) situé à la surface inférieure d'un corps (16) de plaque de cuisson d'une plaque de cuisson électrique (11), la tôle étant pourvue d'un dispositif (52) de fixation, caractérisé en ce qu'un outil (61) d'impression est prévu, qui comporte des éléments (64) d'impression entourant le téton et peut être déplacé en direction de la face inférieure du corps (16) de plaque de cuisson, de façon à enfoncer la tôle (27) de protection, dotée d'une ouverture centrale (53, 59), par une déformation élastique et, le cas échéant, une déformation plastique des zones adjacentes au bord de l'ouverture de la tôle (27) de protection, sur le téton (24) servant de matrice, les éléments (64) d'impression étant pourvus de préférence de surfaces (65) de formage, qui emboutissent le dispositif (52) de fixation de telle sorte qu'il adopte une forme oblique qui se bloque dans un sens opposé au sens de poussée, et en ce qu'un dispositif (72) est prévu, qui est intégré dans l'outil d'impression et est destiné à pratiquer des encoches dans la zone périphérique inférieure du téton (24).
  15. Procédé pour l'installation d'une tôle (27) de protection sur un téton central (24) situé sur la face inférieure d'un corps (16) de plaque de cuisson d'un plaque de cuisson électirque (11), la tôle (27) de protection étant pour-vue, au niveau du téton, d'une ouverture (59), caractérisé en ce que la tôle (27) de protection est emmanchée sur le téton (24), et en ce que, pendant cette opération, des zones périphériques de la tôle (27) de protection, qui entourent l'ouverture (59), se trouvent déformées, le cas échéant, en une forme conique arrondie ou en forme de collerette (70).
  16. Procédé selon la revendication 15, caractérisé en ce que, lors de la déformation, un graissage de l'interface entre la tôle (27) de protection et le téton (24) est assuré par une couche métallique (76) déposée sur la tôle de protection, cette couche étant constituée d'un métal plus doux que la matière de base constitutive de la tôle (27) de protection réalisée de préférence en acier.
  17. Procédé selon une des revendications 15 ou 16, caractérisé en ce que suite à l'emmanchement, des aspérités sont créées sur l'enveloppe extérieure (55) du téton (24) par un martelage.
EP87119412A 1987-03-22 1987-12-31 Plaque de cuisson électrique, dispositif et méthode de montage d'une tôle de protection sur la plaque Expired - Lifetime EP0283591B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87119412T ATE66730T1 (de) 1987-03-22 1987-12-31 Elektrokochplatte, vorrichtung und verfahren zur anbringung eines abdeckbleches an ihr.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3709438 1987-03-22
DE19873709438 DE3709438A1 (de) 1987-03-22 1987-03-22 Elektrokochplatte

Publications (3)

Publication Number Publication Date
EP0283591A2 EP0283591A2 (fr) 1988-09-28
EP0283591A3 EP0283591A3 (en) 1989-03-15
EP0283591B1 true EP0283591B1 (fr) 1991-08-28

Family

ID=6323755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87119412A Expired - Lifetime EP0283591B1 (fr) 1987-03-22 1987-12-31 Plaque de cuisson électrique, dispositif et méthode de montage d'une tôle de protection sur la plaque

Country Status (9)

Country Link
US (1) US4861969A (fr)
EP (1) EP0283591B1 (fr)
JP (1) JPS63262117A (fr)
AT (1) ATE66730T1 (fr)
AU (1) AU608302B2 (fr)
DE (2) DE3709438A1 (fr)
ES (1) ES2025627T3 (fr)
GR (1) GR3002896T3 (fr)
YU (1) YU46330B (fr)

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DE3301219A1 (de) * 1983-01-15 1984-07-19 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrokochplatte
ES278931Y (es) * 1984-04-18 1985-06-01 Teka Industrial, S.A. Dispositivo de fijacion superior rapida de placa electrica
EP0279367A3 (fr) * 1987-02-18 1989-07-26 E.G.O. Elektro-Geräte Blanc u. Fischer Appareil pour la cuisson

Also Published As

Publication number Publication date
ES2025627T3 (es) 1992-04-01
EP0283591A3 (en) 1989-03-15
US4861969A (en) 1989-08-29
JPS63262117A (ja) 1988-10-28
YU46330B (sh) 1993-05-28
YU56788A (en) 1990-10-31
AU608302B2 (en) 1991-03-28
ATE66730T1 (de) 1991-09-15
GR3002896T3 (en) 1993-01-25
DE3709438A1 (de) 1988-10-06
AU1339088A (en) 1988-09-22
EP0283591A2 (fr) 1988-09-28
DE3772555D1 (de) 1991-10-02

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