EP1855357B1 - Dispositif pour contacter électriquement une surface de contact, élément de chauffage avec un tel dispositif et appareil de cuisson avec un tel élément - Google Patents

Dispositif pour contacter électriquement une surface de contact, élément de chauffage avec un tel dispositif et appareil de cuisson avec un tel élément Download PDF

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Publication number
EP1855357B1
EP1855357B1 EP20060290778 EP06290778A EP1855357B1 EP 1855357 B1 EP1855357 B1 EP 1855357B1 EP 20060290778 EP20060290778 EP 20060290778 EP 06290778 A EP06290778 A EP 06290778A EP 1855357 B1 EP1855357 B1 EP 1855357B1
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EP
European Patent Office
Prior art keywords
contact
cooking device
heating element
contact area
contact member
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.)
Active
Application number
EP20060290778
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German (de)
English (en)
Other versions
EP1855357A1 (fr
Inventor
Markus Lingenheil
Reinhard Wassmus
Pascal Gluck
Wilhelm Reimers
Moritz Meye
Fabrice Thiebaud
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.)
Frima SA
Original Assignee
Frima SA
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 Frima SA filed Critical Frima SA
Priority to DE200650002434 priority Critical patent/DE502006002434D1/de
Priority to EP20060290778 priority patent/EP1855357B1/fr
Publication of EP1855357A1 publication Critical patent/EP1855357A1/fr
Application granted granted Critical
Publication of EP1855357B1 publication Critical patent/EP1855357B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • H05B3/08—Heater elements structurally combined with coupling elements or holders having electric connections specially adapted for high temperatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/22—Contacts for co-operating by abutting
    • H01R13/24—Contacts for co-operating by abutting resilient; resiliently-mounted
    • H01R13/2407—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means
    • H01R13/2421—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means using coil springs

Definitions

  • the invention relates to a cooking appliance having at least one heating element with at least one contact surface and a device for electrically contacting the contact surface.
  • a device for electrically contacting a contact surface in particular a flat conductor of a heating element is known, which has a housing in the form of a block for accommodating a connecting element with a contact member which is pressed on the conductor.
  • the contact member is spring-like for this purpose with a semi-circular contact surface, which is movable in the housing perpendicular to the contact surface formed.
  • EP 0 834 959 A2 is a terminal fenbart with a bow-shaped body in which a guide pin presses an electrical conductor on a busbar via spring forces of a compression spring.
  • a plug in which a plunger can be moved within a sleeve parallel to the axis of the sleeve by being biased by a spring so that a cable can be secured in the sleeve. More specifically, the plunger can be partially pulled out of the sleeve, the cable is inserted into the sleeve and the plunger is then released, so that it clamps the cable.
  • a contacting device for heating elements of cooking appliances which can work in a temperature range of 450 ° C., especially with large temperature gradients, becomes particularly problematic.
  • a contacting heating element is particularly in the context of WO 2005/032214 A2 , which discloses a cooking appliance according to the preamble of claim 1, set apart.
  • a resilient locking element is proposed, which has indeed been reinforced, but is still not optimized.
  • EP 1 580 515 A1 discloses a device for electrically contacting two electrodes, in which a substantially pointed contact member, namely the one Electrode, is movably supported by a spring whose longitudinal axis is oblique to the surface normal of a contact surface of the other electrode, so that at an approach of contact member and contact surface the electrode performs a translatory relative movement parallel to the electrode
  • US 2005/0064765 A1 is a device for electrical contact two connectors known, in which a contact member of the first connector is supported by the connector housing so that it can perform only an oblique translational movement relative to the surface normal of a contact surface of the second connector.
  • a sliding movement takes place parallel to the contact surface, which ensures a self-cleaning of the contact surface during contacting.
  • contact pins for electrically connecting a circuit board with a component.
  • a contact member When approaching a contact surface of the component to a contact member performs a cylindrical-section-shaped part of the contact member through a rotational movement, which leads to the sliding of the contact member on the contact surface.
  • a connector for a receiving unit which comprises a point-like contact member, which is supported by a spring and a holder such that the contact member performs a relative movement parallel to the contact surface when approaching the contact surface of the receiving unit, so the contact member on the contact surface slides, wherein the relative movement is composed of a translational and a rotational movement.
  • the object of the invention is to further develop the generic cooking appliance such that it ensures a safe and reliable power transmission or contacting in a non-fixed contact pair long term and constructively simple.
  • the device comprises a contact member and a holding member for movably supporting the contact member such that the contact member upon application of a force, in particular resulting from a thermal expansion, a Performs pendulum movement substantially parallel to the contact surface to unroll on the contact surface while avoiding a purely translational relative movement between the contact member and the contact surface.
  • the contact member contacts the contact surface for providing a contact in only one contact point.
  • the contact member can be pressed on at least one clamping means on the contact surface, wherein preferably the clamping means comprises a spring and / or at least partially disposed between the contact member and the holding member.
  • the contact member comprises a plunger, which in particular has a spherical segment-shaped area for abutment against the contact surface.
  • the plunger is disposed at least partially in the holding member and / or at least partially surrounded by a spring forming the coil spring, being ensured by the spring that the plunger with its longitudinal axis substantially perpendicular to the contact surface biased to the same is.
  • the plunger is at least partially made of stainless steel, and / or at least a portion of the plunger which bears against the contact surface, in particular the spherical segment-shaped region, silver and nickel, preferably in the form of a silver-nickel rivet is.
  • the contact surface is formed by a surface of a silver alloy or a silver surface.
  • the holding member comprises an electrically insulating sleeve, preferably a ceramic sleeve, which surrounds at least the contact member, preferably the contact member and the spring, at least in regions.
  • the sleeve has an at least partially obliquely extending to its longitudinal axis, in particular conically widening in the direction of the contact surface, inner surface to allow the pendulum movement of the contact member.
  • the angle between the inner surface of the sleeve and the longitudinal axis of the sleeve is between 1 ° and 3 °, in particular approximately 2 °.
  • the heating element is a flat heating element, preferably a thick film heating element.
  • the contact surface is covered by the heating element.
  • the holding member to the heating element in particular releasably, can be fastened.
  • the invention also embodiments are proposed, which are characterized by a first plate, preferably first stainless steel plate of the heating element, via which the holding member is fixed to the heating element.
  • the first plate has a, in particular substantially circular, first recess in the region of the contact surface to receive the sleeve, wherein the sleeve preferably on its side facing the contact surface has a projection, such as in the form of a peripheral edge, which engages behind the latter for holding the sleeve on the first plate.
  • embodiments are proposed, which are characterized by a second plate, in particular in the form of a stainless steel plate, a layer of one, in particular ceramic, dielectric, a resistance layer, a glass layer, a thermally and / or electrically insulating layer, preferably in the form of a microplate, and / or the first plate.
  • the layer of a dielectric, the resistive layer, the glass layer and the micro-plate are held.
  • the micro-plate has or have a second recess for the contact member and / or the holding member.
  • it comprises a crucible, preferably with a plurality of heating elements on at least one crucible outer wall, in particular on the crucible bottom.
  • the invention is thus based on the surprising finding that while avoiding a purely translational relative movement between a contact member and a contact surface, ie a contact pair, by a pendulum movement of the contact member substantially parallel to the contact surface, the contact pair can roll on each other.
  • a pendulum contact between the contact pair is maintained substantially, which ensures that the close-resistance on the one hand at the pendulum movements of the contact member relative to the contact surface and the other during the life of a device according to the invention for electrically contacting the contact surface by the contact member on a constant low level remains.
  • a hitherto usual B-fritting or fritting corrosion caused by translatory micromotion is avoided and a high temperature stability, even up to 450 ° C, is achieved.
  • the device according to the invention advantageously has a compact, self-contained and thus easily integrable design, namely due to a substantially sleeve-shaped, preferably insulating, holding member of the contact member.
  • a clamping means in particular in the form of a spring, it can be ensured that the contact force of the contact member is always perpendicular to the contact surface, and always determined and almost constant.
  • This contact force or spring force is namely largely defined exactly and temperature and tolerance independent.
  • the use of a silver-nickel rivet as part of the contact member and a surface From a silver alloy or a silver surface as a contact surface leads to a particularly good contact material pairing, which is coordinated.
  • the reliability of a contact can be optimized by the appropriate choice of materials, geometries and spring force. Firstly, contact wear can be minimized and, secondly, the stability of the contacts maximized by micro-movements between the contact pairs, i. H. the contact member and the contact surface, wear-friendly converted into a rolling motion.
  • the device according to the invention for the electrical contacting of a contact surface can be easily manufactured inexpensively.
  • An insert of this device for contacting heating elements, especially in cooking appliances, is thus easily possible.
  • FIG. 1 is a device 1 for electrically contacting a contact surface, that is a contacting device, shown for use in a cooking appliance according to the invention, namely for contacting a heating element 10.
  • the heating element 10 is usually made of a first, not shown stainless steel plate, whereupon a ceramic, not shown dielectric is applied to the turn, a resistive layer 12 is applied.
  • the resistive layer 12 is in turn coated with a glass layer 14 which protects the resistive layer 12 from contact, steaming or the like.
  • the glass layer 14 is fixedly connected to the resistive layer 12 for this purpose.
  • a mica or micro plate 16 is arranged as a buffer layer, in particular to thermally isolate the heating element 10 on the one hand and the other thermally, so that the heating element 10 supplied heat energy only in one direction, in the case of use in a not shown Crucible towards the interior of the crucible, is directed or radiated, ie in FIG. 1 downward.
  • a second stainless steel plate 17 is usually applied, which is used to compress all layers of the heating element 10 between the two stainless steel plates 17 via corresponding fastening devices, in particular rivets or screws. Since the different layers 12, 14, 16 and 17 have different coefficients of thermal expansion, small relative movements between the individual layers take place with temperature fluctuations.
  • the contacting device 1 has an electrically insulating ceramic sleeve 18 into which a plunger 20 made of an electrically conductive material, in particular a metal, is movably inserted. At the one end facing away from the heating element 10 of the plunger 20, a contact portion 22 is provided to electrically connect this plunger 20 with a power source, not shown. Further details of the plunger, that is to say its components and its construction, are explained below, in particular with reference to FIGS. 4 and 5.
  • FIG. 2 is another perspective view of the device 1 for electrically contacting a contact surface for use in a cooking appliance according to the invention, where again the electric heating element 10 with the resistance layer 12, the glass layer 14, the micro-plate 16 and the stainless steel plate 17 and the ceramic sleeve 18th , in which the plunger 20 is introduced, can be seen.
  • the ceramic sleeve 18 thus extends over a first recess 24 in the stainless steel plate 17 and a second recess 28 in the micro-plate 16, wherein the diameter of the first recess 24 corresponds to the outer diameter of the ceramic sleeve 18 substantially, while the diameter of the second recess 28 significantly larger than the outer diameter of the ceramic sleeve 18 is.
  • FIG. 3 shows the device 1 in a plan view, so that essentially only the stainless steel plate 17, the ceramic sleeve 18 and the plunger 20 can be seen with its contact region 22. Further, a rectangular dashed line 28 for illustrating the second recess 28, therein a first circular dashed line to illustrate the peripheral edge 26 of the ceramic sleeve 18 and concentrically therein a second circular dashed line to illustrate the first recess 24 is indicated.
  • FIG. 4 are essentially the same elements as in FIGS. 1 and 2 to see so that they are denoted by the same reference numerals.
  • the ceramic sleeve 18 is therefore hollow inside so that it can receive a (spiral) spring 30 and the plunger 20 to press the plunger 20 in the direction of a contact surface 32 made of silver or a silver alloy on the resistive layer 12 or press.
  • FIG. 5 is a detailed sectional view of the device 1 for electrically contacting a contact surface for use in a cooking appliance according to the invention, wherein the same elements are provided with the same reference numerals.
  • the plunger 20 at its other, lower, the resistance layer 12 facing the end of a ball portion-shaped rivet 34 which on the contact surface 32 of the heating element 10th can "roll".
  • the cooperation of the rivet 34 which may consist of a silver-nickel alloy, with the silver of the contact surface 32 ensures optimum electrical contact between the plunger 20 and the contact surface 32 due to a rolling motion caused by a pendulum movement of the plunger 20 in the is supported substantially parallel to the contact surface 32 and perpendicular to the axis of the plunger 20.
  • the inner surface 36 of the ceramic sleeve 18 has a slightly conical shape, which open to the heating element 10, more precisely to the resistance layer 12 out.
  • the inner surface 36 may have approximately an angle of 2 degrees to an inner wall of an ideal cylinder.
  • the plunger 20 is secured in a manner other than described, since it is important in the invention that the plunger 20 can perform with the rivet 34 on the contact surface 32 a pendulum and rolling motion, so that at a Relative movement between the ceramic sleeve 18 and / or the plunger 20 on the one hand and the contact surface 32 on the other hand, namely due to thermal expansion, no purely translational movements between the rivet 34 and the contact surface 32 arise, so the rivet 34 is securely pressed evenly on the contact surface 32.
  • Such relative movements due to different thermal expansion coefficients of the different materials of the heating element 10 take place in the micrometer range, so that the slightly conical inner surface 36 of the ceramic sleeve 18 provides enough freedom of movement for the plunger 20.
  • the spring 30 is arranged around the plunger 20. It should be noted that the spring force for each adjustment during a pendulum motion on the contact surface 32 is substantially equal. Furthermore, the tightness resistance, i. H. the resistance between the contact surface 32 and the plunger 20, maintained at a constant low level by between the rivet 34 and the contact surface 32 due to the spherical segment-shaped configuration of the rivet 34 is always only a punctiform contact. Also, is achieved by such an arrangement by the spring 30, that the contact force for a always determined and is still constant and on the other hand is always perpendicular to the contact surface 32.

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  • Baking, Grill, Roasting (AREA)

Claims (19)

  1. Appareil de cuisson comprenant au moins un élément chauffant (10) avec au moins une surface de contact (32) et un dispositif (1) pour mettre en contact électriquement la surface de contact (32), caractérisé en ce que
    le dispositif (1) comporte un élément de contact (20, 22, 26, 34) et un élément bloqueur (18) pour loger de manière mobile l'élément de contact (20, 22, 26, 34) de sorte que l'élément de contact (20, 22, 26, 34) effectue, lors de la sollicitation par une force résultant en particulier d'une expansion thermique, un mouvement pendulaire essentiellement de manière parallèle à la surface de contact (32), pour rouler sur la surface de contact (32) en évitant un mouvement relatif purement translatoire entre l'élément de contact (20, 22, 26, 34) et la surface de contact (32).
  2. Appareil de cuisson selon la revendication 1, caractérisé en ce que
    l'élément de contact (20, 22, 26, 34) est en contact avec la surface de contact (32) pour fournir un contact en seulement un point de contact.
  3. Appareil de cuisson selon la revendication 1 ou 2, caractérisé en ce que
    l'élément de contact (20, 22, 26, 34) peut être pressé sur la surface de contact (32) par l'intermédiaire d'au moins un moyen de serrage (30), le moyen de serrage comportant de préférence un ressort (30) et/ou étant agencé au moins par endroits entre l'élément de contact (20, 22, 26, 34) et l'élément bloqueur (18).
  4. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que
    l'élément de contact comporte un coulisseau (20, 22, 26, 34), qui présente en particulier un secteur (34), formant une partie de sphère, destiné à reposer sur la surface de contact (32).
  5. Appareil de cuisson selon la revendication 4, caractérisé en ce que
    le coulisseau (20, 22, 26, 34) est agencé au moins par endroits dans l'élément bloqueur (18) et/ou est entouré au moins par endroits par un ressort hélicoïdal formant le ressort (30), la précontrainte du coulisseau (20, 22, 26, 34) sur la surface de contact (32), avec son axe longitudinal essentiellement perpendiculaire à celle-ci, étant assurée par l'intermédiaire du ressort (30).
  6. Appareil de cuisson selon la revendication 4 ou 5, caractérisé en ce que
    le coulisseau (20, 22, 26, 34) est constitué au moins par endroits d'acier inoxydable, et/ou au moins un secteur, reposant sur la surface de contact (32), du coulisseau (20, 22, 26, 34), en particulier le secteur (34) formant une partie de sphère, comporte de l'argent et du nickel, de préférence sous la forme d'un rivet argent-nickel.
  7. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que
    la surface de contact (32) est formée par une surface constituée d'un alliage d'argent ou bien d'une surface en argent.
  8. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que
    l'élément bloqueur (18) comporte une gaine électriquement isolante, de préférence une gaine en céramique (18), qui entoure au moins par endroits au moins l'élément de contact (20, 22, 26, 34), de préférence l'élément de contact (20, 22, 22, 34) et le ressort (30).
  9. Appareil de cuisson selon la revendication 8, caractérisé en ce que
    la gaine (18) présente une surface intérieure (36), s'étendant au moins par secteurs diagonalement par rapport à l'axe longitudinal de la gaine, en particulier en s'évasant de manière conique en direction de la surface de contact (32), pour permettre le mouvement pendulaire de l'élément de contact (20, 22, 26, 34).
  10. Appareil de cuisson selon la revendication 9, caractérisé en ce que
    l'angle entre la surface intérieure (36) de la gaine (18) et l'axe longitudinal de la gaine (18) est compris entre 1° et 3°, et est en particulier d'environ 2°.
  11. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que
    l'élément chauffant (10) est un élément chauffant plat, de préférence un élément chauffant en couche épaisse.
  12. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que
    la surface de contact (32) est comprise dans l'élément chauffant (10).
  13. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que
    l'élément bloqueur (18) peut être fixé, en particulier de manière amovible, sur l'élément chauffant (10).
  14. Appareil de cuisson selon la revendication 13, caractérisé par
    une première plaque (17), de préférence une première plaque en acier inoxydable de l'élément chauffant (10), par l'intermédiaire de laquelle l'élément bloqueur (18) est fixé à l'élément chauffant (10).
  15. Appareil de cuisson selon la revendication 14, caractérisé en ce que
    la première plaque (17) présente un premier évidement (24), en particulier essentiellement circulaire, dans le secteur de la surface de contact (32), pour recevoir la gaine (18), la gaine (18) présentant une saillie, pouvant avoir la forme d'un bord périphérique (26), de préférence au niveau de son côté tourné vers la surface de contact (32), et qui engage par l'arrière la première plaque (17) afin de maintenir la gaine (18) sur celle-ci.
  16. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que
    l'élément chauffant comporte une seconde plaque, en particulier sous la forme d'une plaque en acier inoxydable, une couche constituée d'un diélectrique, en particulier en céramique, une couche de résistance (12), une couche de verre (14), une couche thermiquement et/ou électriquement isolante, de préférence sous la forme d'une plaque de mica (16), et/ou la première plaque (17).
  17. Appareil de cuisson selon la revendication 16, caractérisé en ce que
    la couche constituée d'un diélectrique, la couche de résistance (12), la couche de verre (14) et la couche de mica (16) sont fixées entre les première et seconde plaques d'acier inoxydable (17).
  18. Appareil de cuisson selon la revendication 16 ou 17, caractérisé en ce que
    la plaque de mica (16) présente un second évidement (28) pour l'élément de contact (20, 22, 26, 34) et/ou l'élément bloqueur (18).
  19. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que
    une casserole, avec de préférence une pluralité d'éléments chauffants au niveau d'au moins une paroi extérieure de la casserole, en particulier au niveau d'un fond de la casserole, est incluse.
EP20060290778 2006-05-11 2006-05-11 Dispositif pour contacter électriquement une surface de contact, élément de chauffage avec un tel dispositif et appareil de cuisson avec un tel élément Active EP1855357B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200650002434 DE502006002434D1 (de) 2006-05-11 2006-05-11 Vorrichtung zum elektrischen Kontaktieren einer Kontaktfläche, Heizelement mit solch einer Vorrichtung und Gargerät mit solch einem Heizelement
EP20060290778 EP1855357B1 (fr) 2006-05-11 2006-05-11 Dispositif pour contacter électriquement une surface de contact, élément de chauffage avec un tel dispositif et appareil de cuisson avec un tel élément

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060290778 EP1855357B1 (fr) 2006-05-11 2006-05-11 Dispositif pour contacter électriquement une surface de contact, élément de chauffage avec un tel dispositif et appareil de cuisson avec un tel élément

Publications (2)

Publication Number Publication Date
EP1855357A1 EP1855357A1 (fr) 2007-11-14
EP1855357B1 true EP1855357B1 (fr) 2008-12-24

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EP20060290778 Active EP1855357B1 (fr) 2006-05-11 2006-05-11 Dispositif pour contacter électriquement une surface de contact, élément de chauffage avec un tel dispositif et appareil de cuisson avec un tel élément

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EP (1) EP1855357B1 (fr)
DE (1) DE502006002434D1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3214722A (en) * 1964-11-17 1965-10-26 Amp Inc Terminal assembly for heating panel or the like
JP3520468B2 (ja) * 2000-06-21 2004-04-19 日本航空電子工業株式会社 コネクタ
JP3587301B2 (ja) * 2001-06-20 2004-11-10 株式会社エンプラス 電気部品用ソケット
CN2660717Y (zh) * 2003-09-23 2004-12-01 富士康(昆山)电脑接插件有限公司 输入输出连接器
US6935901B2 (en) * 2003-09-24 2005-08-30 Motorola, Inc. Self-cleaning connector
GB0406550D0 (en) * 2004-03-24 2004-04-28 Westland Helicopters Contact arrangement

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DE502006002434D1 (de) 2009-02-05
EP1855357A1 (fr) 2007-11-14

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