EP2697568B1 - Control element and a household device - Google Patents

Control element and a household device Download PDF

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Publication number
EP2697568B1
EP2697568B1 EP12711653.1A EP12711653A EP2697568B1 EP 2697568 B1 EP2697568 B1 EP 2697568B1 EP 12711653 A EP12711653 A EP 12711653A EP 2697568 B1 EP2697568 B1 EP 2697568B1
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EP
European Patent Office
Prior art keywords
operating element
plastic
filler
element according
main body
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.)
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EP12711653.1A
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German (de)
French (fr)
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EP2697568A1 (en
Inventor
Stéphane CLAUSS
Martin Oberhomburg
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Priority to PL12711653T priority Critical patent/PL2697568T3/en
Priority to EP12711653.1A priority patent/EP2697568B1/en
Publication of EP2697568A1 publication Critical patent/EP2697568A1/en
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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
    • G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
    • G05G1/08—Controlling members for hand actuation by rotary movement, e.g. hand wheels
    • G05G1/10—Details, e.g. of discs, knobs, wheels or handles
    • 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
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20732—Handles
    • Y10T74/20834—Hand wheels
    • Y10T74/2084—Knob or dial

Definitions

  • the invention relates to an operating element for household appliances, in particular a control knob for a thermal household appliance. Furthermore, the invention relates to a household appliance with at least one control knob.
  • control elements such as control knobs
  • plastic gag is often used. But these do not convey the high-quality feeling of metal gags.
  • plastic toggle metallic It is known to coat plastic toggle metallic.
  • a household appliance is described with a plastic control element, which is outweighed with a nickel coating.
  • the nickel coating is further provided with a noble metal coating, which improves the resistance of the operating element to external influences.
  • An advantage here is that the visual impression of the gag is very good.
  • a disadvantage is that the sense of touch continues to correspond to the tactile sensation imparted by plastic.
  • the usually very thin metallic layer is not sufficient to give a good feeling of metal to the user.
  • metal feeling herein is meant the feeling imparted to the user when touching a metallic body.
  • a metallic body usually feels cold or cool to the user even when the body has room temperature, for example.
  • gags made of aluminum-zinc alloys Al-Zn alloy
  • Zamak Zamak
  • Object of the present invention is thus to provide a plastic operating element, in particular a plastic control knob, which gives the user the feeling of a metal gag there.
  • a plastic operating element in particular a plastic control knob, which gives the user the feeling of a metal gag there.
  • both the visual impression and the sense of touch should be considered.
  • the invention is based on the finding that this object can be achieved by using as the material for the operating element a plastic which has a filling.
  • an operating element for a household appliance wherein the operating element has a base body made of plastic.
  • the operating element is characterized in that the plastic is mixed with filler, which has a higher thermal conductivity than the plastic.
  • an operating element an element is referred to in the context of the invention, controlled by the functions and services of the household appliance by the user, that is controlled or adjusted, can be.
  • the operating element here is preferably a mechanical operating element, in particular a switch or toggle.
  • a mechanical control element in this context, an operating element is referred to, which is mechanically actuated by the user.
  • Other functions of the control element can be performed electrically or otherwise.
  • domestic appliances are in particular heat-conducting domestic appliances, such as ovens, stoves and cooking stoves.
  • control element according to the invention can also be used, for example, in large appliances of white goods, such as, for example, refrigerators, freezers, freezers, electric cookers, washing machines, dishwashers, extractor hoods and tumble dryers.
  • control element according to the invention can also be used on small appliances, such as a toaster.
  • the part of the control element is referred to, on which the user exerts the force for actuating the operating element.
  • the main body thus represents the part of the operating element which is touched or grasped by the user.
  • the contact or the encompassing takes place indirectly, that is to say over the coating.
  • the plastic is mixed with filler, which have a higher thermal conductivity than the plastic.
  • the plastic is preferably a polymer.
  • a filler is understood as meaning a plastic in which filler is incorporated or incorporated in a plastic matrix.
  • the plastic is thus interspersed with the filler.
  • the filler is uniformly distributed in the plastic or the plastic matrix.
  • the thermal conductivity is referred to in particular as the specific thermal conductivity ( ⁇ ).
  • the control element By providing in the base body filler with higher thermal conductivity in the plastic, the control element can be produced on the one hand cost. On the other hand, however, by increasing the thermal conductivity of the main body due to the addition of the filler, a metallic feel when touching the control element is generated.
  • the present invention makes particular use of the fact that the tactile sensation of metal gags is mainly due to the high thermal conductivity.
  • the handling of a metal gag at ambient temperatures gives a cold feeling.
  • the ambient temperature ( ⁇ 20 ° C) is colder than the skin of the fingers (> 30 ° C) and there is a rapid heat transfer between the toggle and the finger, which gives a cold feeling. This feeling, which can also be called "cool touch", can only be achieved with high thermal conductivity.
  • the thermal conductivity of aluminum is for example ⁇ 200 W / mK and for conventional plastics only 0.2-0.3 W / mK.
  • a plastic gag can not produce the "cool touch". With the control knob according to the invention, however, this "cool touch" can be generated.
  • the fillers are also provided in the plastic, that is distributed in this, damage due to mechanical stress, which can occur in a pure coating is not to be feared.
  • the material thickness of the main body is generally greater, so that the heat transfer can take place over a greater distance in the material.
  • the use of a filled plastic is advantageous since the filler is distributed in the plastic matrix and so on the surface, which is touched by the user - optionally by a coating -, the contact between the skin of the user and the filler is ge employersrleitstet. This achieves the heat transfer necessary to create a metallic feel.
  • filler of higher thermal conductivity is advantageous because it can be added specifically according to the thermal and mechanical requirements and the control can thus be modified according to the desired use.
  • the composition and the amount of filler can be varied.
  • the normal operating temperature of the household appliance in the area of the operating element can be taken into account.
  • the filler is preferably present in particle form in the plastic of the body.
  • the filler may be present as spheres, grains, fibers and / or as a powder.
  • the desired thermal conductivity of the material of the base body can be adjusted in a simpler and more reliable manner in the preferred form of the filler according to the invention as a particle.
  • the material of the filler may be selected from a variety of materials as long as the thermal conductivity of the material is higher than the thermal conductivity of the plastic into which the filler is introduced.
  • metallic fillers according to the invention in particular copper powder or aluminum powder or stainless steel powder.
  • the advantage of metallic fillers is in particular the low acquisition costs and their mechanical strength.
  • metallic fillers and, in particular, copper, for example in the form of powder are advantageous since these, and in particular a plastic offset or filled with same, can also be galvanically coated with materials such as chromium or nickel.
  • copper has a thermal conductivity of 400W / mK and thus already lower amounts of filler sufficient to achieve a desired thermal conductivity of the material of the main body of the control element.
  • ceramic fillers and / or glass fillers such as glass beads, and / or carbon fillers, such as graphite or diamond to use.
  • Other possible fillers include aluminum nitride or boron nitride.
  • the material of the base body has a thermal conductivity of 0.5 to 30 W / mK, preferably from 1 to 20 W / mK.
  • the material of the main body of the plastic is referred to with the incorporated or introduced filler.
  • This thermal conductivity can be adjusted by selecting the material of the fillers and their amount accordingly.
  • the thermal conductivity of the material of the body is preferably increased compared to a pure plastic body, but much lower compared to pure metal bodies.
  • An advantage of this average thermal conductivity is that the operating element can also be used in household appliances in which the operating temperature in the region of the operating element is high. Such household appliances are, for example, gas cookers, which may be integrated in ovens or may be present as a separate household appliance.
  • the volume fraction of the filler in the material of the main body is less than 70%, preferably less than 50%.
  • This amount of fillers has proven to be particularly advantageous in fillers containing copper or made of copper. By this amount of fillers, the properties of the matrix material of the body, that is the plastic, and those of the filler can be optimally combined.
  • the plastic of the base body preferably represents a thermoplastic.
  • the plastic of the base body, which is mixed with the fillers comprises technical polymers, in particular polyamides.
  • polystyrene As technical polymers, inter alia, the following polymers are referred to.
  • Further examples of engineering polymers are PBT (polybutylene terephthalate), polycarbonates (PC), polyoxymethylene (POM), polypropylene (PP), polystyrene (PS) and the like.
  • Polyamides are preferred according to the invention. It has been found that polyamides with fillers according to the present invention, in particular with copper powder, have a suitability for coating, in particular with metallic coatings.
  • the coating preferably represents a metallic coating.
  • the base body being made of a plastic with a filler of higher thermal conductivity
  • the metallic coating is no longer solely responsible for imparting a metallic feel when the operating element is touched.
  • the thickness of the coating can therefore be minimized.
  • the coating preferably has a thickness of less than 0.1 mm.
  • the coating may be, for example, a nickel or chromium plating.
  • the visual impression of the operating element is improved by the metallic coating and, in particular, a metallic appearance is produced.
  • control element is a control knob.
  • an operating element is referred to, which is usually actuated by rotational movement and optionally in addition by axial movement.
  • rotational movement the user is in contact with the operating element for a longer time, so that in this case the advantages of the operating element according to the invention come into play in particular.
  • the control element according to the invention can represent an injection molded part.
  • plastic as the matrix material for the base body, complex shapes of the control element can be easily produced by injection molding become.
  • the injection molding of thermally conductive plastics differs from the injection molding of the pure polymer matrix.
  • By filling the plastic with particles and the increase in the thermal conductivity of the plastic mass is an accelerated transport of thermal energy from the plastic into the colder tool instead.
  • the filled polymer solidifies faster in the edge area and narrows flow paths and cavities.
  • the process control and the process parameters are therefore adapted to these changed material properties in the production of a control element according to the invention.
  • the injection speed and the injection pressure are preferably increased in comparison to processes with pure plastic.
  • the invention relates to a household appliance with at least one control element, wherein at least one of the control elements represents an inventive control element.
  • the control element on a base made of plastic, wherein the plastic is mixed with filler, which has a higher thermal conductivity than the plastic.
  • the household appliance represents a cooking point, in particular a gas hob.
  • the advantages of the present invention in particular the adjustable or set thermal conductivity of the control element, come particularly to bear.
  • control element according to the invention applies - as far as applicable - accordingly for the household appliance according to the invention and vice versa.
  • FIG. 1 is a schematic sectional view of an embodiment of an operating element 1 according to the invention shown.
  • this consists of a main body 10 and an axle 11.
  • the main body 10 is provided with a coating 12 on its outer side.
  • the main body 10 and the axle 11 are shown as separate components in the illustrated embodiment, it is within the scope of the invention that they form an integral, that is a single, component.
  • the control element 1 is in the illustrated embodiment, a rotationally symmetrical control knob, which can be rotated about the axis of rotation D of the axle 11.
  • a lid which represents a part of the base body 10 in the illustrated embodiment.
  • the control element 1 with other elements such as an actuating shaft (not shown) can be connected.
  • the base body 10 is provided with a coating 12.
  • the control knob 1 grooves 13 are also introduced at the closed end, which facilitate rotation of the control knob 1 for the user.
  • Advantages of the present invention include a noble appearance, brushed stainless steel, for example.
  • an inventive control element in particular a control knob according to the invention has a "cool touch" effect. Compared to a pure metal gag, the operating element according to the invention also allows higher operating temperatures.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Cookers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Description

Die Erfindung betrifft ein Bedienelement für Haushaltsgeräte, insbesondere einen Bedienknebel für ein thermisches Haushaltsgerät. Weiterhin betrifft die Erfindung ein Haushaltsgerät mit mindestens einem Bedienknebel.The invention relates to an operating element for household appliances, in particular a control knob for a thermal household appliance. Furthermore, the invention relates to a household appliance with at least one control knob.

An vielen Haushaltsgeräten werden Bedienelemente, wie beispielsweise Bedienknebel, genutzt um Leistungen oder Funktionen einstellen. zu können. Aus Kostengründen oder wegen externer physikalischer Beanspruchungen, werden oft Kunststoffknebel eingesetzt. Diese vermitteln aber nicht das hochwertige Gefühl von Metallknebeln.On many household appliances, control elements, such as control knobs, are used to set performance or functions. to be able to. For cost reasons or because of external physical stress, plastic gag is often used. But these do not convey the high-quality feeling of metal gags.

Es ist bekannt Kunststoffknebel metallisch zu beschichten. In der DE 102008043125 A1 wird ein Haushaltsgerät mit einem Bedienelement aus Kunststoff beschrieben, die mit einer Nickelbeschichtung überwogen ist. Die Nickelbeschichtung ist ferner mit einer Edelmetallbeschichtung versehen, die die Beständigkeit des Bedienelementes gegenüber äußeren Einflüssen verbessert. Ein Vorteil hierbei ist, dass der optische Eindruck des Knebels sehr gut ist. Ein Nachteil ist, dass das Tastgefühl weiterhin dem Tastgefühl entspricht, das von Kunststoff vermittelt wird. Die in der Regel sehr dünne metallische Schicht ist nicht ausreichend, um ein gutes Metallgefühl an den Benutzer zu vermitteln. Als Metallgefühl wird hierin das Gefühl bezeichnet, dass dem Benutzer bei Berührung eines metallischen Körpers vermittelt wird. Insbesondere fühlt sich ein metallischer Körper für den Benutzer in der Regel kalt oder kühl an, selbst wenn der Körper beispielsweise Raumtemperatur besitzt.It is known to coat plastic toggle metallic. In the DE 102008043125 A1 a household appliance is described with a plastic control element, which is outweighed with a nickel coating. The nickel coating is further provided with a noble metal coating, which improves the resistance of the operating element to external influences. An advantage here is that the visual impression of the gag is very good. A disadvantage is that the sense of touch continues to correspond to the tactile sensation imparted by plastic. The usually very thin metallic layer is not sufficient to give a good feeling of metal to the user. As metal feeling herein is meant the feeling imparted to the user when touching a metallic body. In particular, a metallic body usually feels cold or cool to the user even when the body has room temperature, for example.

Weiterhin wurde vorgeschlagen, ein Metallgewicht in einen Kunststoffknebel zu integrieren, wobei das Metallgewicht von dem Kunststoffknebel umgeben ist. Hierdurch wird zwar eine hochwertige Haptik geschaffen. Ein Nachteil dieser Variante ist aber, dass das Knebelgewicht nur dann bemerkbar ist, wenn der Knebel abgezogen ist und einen ausreichend großen Durchmesser aufweist.Furthermore, it has been proposed to integrate a metal weight in a plastic gag, wherein the metal weight is surrounded by the plastic gag. Although this creates a high-quality feel. A disadvantage of this variant, however, is that the toggle weight is only noticeable when the gag is pulled off and has a sufficiently large diameter.

Weiterhin sind Knebel aus Aluminium-Zink-Legierungen (Al-Zn-Legierung), insbesondere Zamak, bekannt. Ein Vorteil hierbei ist, dass diese Knebel ein sehr gutes Metallgefühl vermitteln. Allerdings können die Knebel in vielen Geräten wegen der niedrigen zulässigen Temperaturgrenze nicht verwendet werden.Furthermore, gags made of aluminum-zinc alloys (Al-Zn alloy), in particular Zamak, are known. An advantage here is that this gag is a very good one Convey metal sensation. However, the toggles can not be used in many devices because of the low allowable temperature limit.

Aufgabe der vorliegenden Erfindung ist es somit, ein Kunststoffbedienelement, insbesondere einen Kunststoffbedienknebel, zu schaffen, der dem Benutzer das Gefühl eines Metallknebels gibt. Hierbei sollen sowohl der optische Eindruck als auch der Tastsinn berücksichtigt werden.Object of the present invention is thus to provide a plastic operating element, in particular a plastic control knob, which gives the user the feeling of a metal gag there. Here, both the visual impression and the sense of touch should be considered.

Der Erfindung liegt die Erkenntnis zugrunde, dass diese Aufgabe gelöst werden kann, indem als Material für das Bedienelement ein Kunststoff, der eine Füllung aufweist, verwendet wird.The invention is based on the finding that this object can be achieved by using as the material for the operating element a plastic which has a filling.

Gemäß der vorliegenden Erfindung wird diese Aufgabe daher gelöst durch ein Bedienelement für ein Haushaltsgerät, wobei das Bedienelement einen Grundkörper aus Kunststoff aufweist. Das Bedienelement ist dadurch gekennzeichnet, dass der Kunststoff mit Füllstoff versetzt ist, der eine höhere Wärmeleitfähigkeit als der Kunststoff aufweist.According to the present invention, this object is therefore achieved by an operating element for a household appliance, wherein the operating element has a base body made of plastic. The operating element is characterized in that the plastic is mixed with filler, which has a higher thermal conductivity than the plastic.

Als Bedienelement wird im Sinne der Erfindung ein Element bezeichnet, über das Funktionen und Leistungen des Haushaltsgerätes von dem Benutzer kontrolliert, das heißt gesteuert oder eingestellt, werden können. Das Bedienelement ist hierbei vorzugsweise ein mechanisches Bedienelement, wie insbesondere ein Schalter oder Knebel. Als mechanisches Bedienelement wird in diesem Zusammenhang ein Bedienelement bezeichnet, das durch den Benutzer mechanisch betätigt wird. Weitere Funktionen des Bedienelements können allerdings elektrisch oder andersartig ausgeführt sein. Als Haushaltsgerät werden im Sinne der vorliegenden Erfindung insbesondere wärmeführende Haushaltsgeräte, wie Backöfen, Herde und Kochstellen verstanden. Das erfindungsgemäße Bedienelement kann aber beispielsweise auch bei Großgeräten weißer Ware, wie beispielsweise Kühlschränken, Gefrierschränken, Gefriertruhen, Elektroherden, Waschmaschinen, Geschirrspülmaschinen, Dunstabzugshauben und Wäschetrockner verwendet werden. Schließlich kann das erfindungsgemäße Bedienelement auch an Kleingeräten verwendet werden, wie beispielsweise einem Toaster.As an operating element, an element is referred to in the context of the invention, controlled by the functions and services of the household appliance by the user, that is controlled or adjusted, can be. The operating element here is preferably a mechanical operating element, in particular a switch or toggle. As a mechanical control element in this context, an operating element is referred to, which is mechanically actuated by the user. Other functions of the control element, however, can be performed electrically or otherwise. For the purposes of the present invention, domestic appliances are in particular heat-conducting domestic appliances, such as ovens, stoves and cooking stoves. However, the control element according to the invention can also be used, for example, in large appliances of white goods, such as, for example, refrigerators, freezers, freezers, electric cookers, washing machines, dishwashers, extractor hoods and tumble dryers. Finally, the control element according to the invention can also be used on small appliances, such as a toaster.

Als Grundkörper des Bedienelementes wird erfindungsgemäß der Teil des Bedienelementes bezeichnet, auf den der Benutzer die Kraft zum Betätigen des Bedienelementes ausübt. Insbesondere stellt der Grundkörper somit den Teil des Bedienelementes dar, der von dem Benutzer berührt oder umgriffen wird. Bei einem beschichteten Grundkörper erfolgt hierbei die Berührung beziehungsweise das Umgreifen indirekt, das heißt über die Beschichtung.As the main body of the control element according to the invention the part of the control element is referred to, on which the user exerts the force for actuating the operating element. In particular, the main body thus represents the part of the operating element which is touched or grasped by the user. In the case of a coated base body, the contact or the encompassing takes place indirectly, that is to say over the coating.

Erfindungsgemäß ist der Kunststoff mit Füllstoff versetzt, der eine höhere Wärmeleitfähigkeit als der Kunststoff aufweisen. Der Kunststoff stellt vorzugsweise ein Polymer dar. Als mit Füllstoff versetzt wird hierbei ein Kunststoff verstanden, in dem in einer Kunststoffmatrix Füllstoff aufgenommen oder eingebunden ist. Der Kunststoff ist somit mit dem Füllstoff durchsetzt. Vorzugsweise ist der Füllstoff gleichmäßig in dem Kunststoff beziehungsweise der Kunststoffmatrix verteilt. Als Wärmeleitfähigkeit wird im Sinne der Erfindung insbesondere die spezifische Wärmeleitfähigkeit (λ) bezeichnet. Obwohl in der Beschreibung von Füllstoff im Singular gesprochen wird, versteht es sich, dass dieser aus mehreren Teilen bestehen kann und auch aus verschiedenen Materialien bestehen kann.According to the invention, the plastic is mixed with filler, which have a higher thermal conductivity than the plastic. The plastic is preferably a polymer. In this case, a filler is understood as meaning a plastic in which filler is incorporated or incorporated in a plastic matrix. The plastic is thus interspersed with the filler. Preferably, the filler is uniformly distributed in the plastic or the plastic matrix. In the context of the invention, the thermal conductivity is referred to in particular as the specific thermal conductivity (λ). Although the description of filler in the singular is spoken, it is understood that it may consist of several parts and may also consist of different materials.

Indem in dem Grundkörper Füllstoff mit höherer Wärmeleitfähigkeit in dem Kunststoff vorgesehen ist, kann das Bedienelement zum einen kostengünstig hergestellt werden. Zum anderen wird aber durch die Erhöhung der Wärmeleitfähigkeit des Grundkörpers aufgrund der Zugabe des Füllstoffs, ein metallisches Gefühl beim Berühren des Bedienelementes erzeugt. Mit der vorliegenden Erfindung wird insbesondere die Tatsache genutzt, dass das Tastgefühl von Metallknebeln hauptsächlich auf die hohe Wärmeleitfähigkeit zurückzuführen ist. Die Handhabung eines Metallknebels bei Umgebungstemperaturen vermittelt ein kaltes Gefühl. Die Umgebungstemperatur (~20°C) ist nämlich kälter als die Haut der Finger (>30°C) und es kommt zu einer schnellen Wärmeübertragung zwischen dem Knebel und dem Finger, was ein kaltes Gefühl vermittelt. Dieses Gefühl, das auch als "cool touch" bezeichnet werden kann, kann nur bei hoher Wärmeleitfähigkeit erzielt werden. Die Wärmeleitfähigkeit von Aluminium liegt beispielsweise bei ~200 W/mK und bei konventionellen Kunststoffen bei nur 0,2-0,3 W/mK. Ein Kunststoffknebel kann also den "cool touch" nicht erzeugen. Mit dem erfindungsgemäßen Bedienknebel hingegen kann dieser "cool touch" erzeugt werden.By providing in the base body filler with higher thermal conductivity in the plastic, the control element can be produced on the one hand cost. On the other hand, however, by increasing the thermal conductivity of the main body due to the addition of the filler, a metallic feel when touching the control element is generated. The present invention makes particular use of the fact that the tactile sensation of metal gags is mainly due to the high thermal conductivity. The handling of a metal gag at ambient temperatures gives a cold feeling. The ambient temperature (~ 20 ° C) is colder than the skin of the fingers (> 30 ° C) and there is a rapid heat transfer between the toggle and the finger, which gives a cold feeling. This feeling, which can also be called "cool touch", can only be achieved with high thermal conductivity. The thermal conductivity of aluminum is for example ~ 200 W / mK and for conventional plastics only 0.2-0.3 W / mK. A plastic gag can not produce the "cool touch". With the control knob according to the invention, however, this "cool touch" can be generated.

Da der Füllstoffe zudem in dem Kunststoff vorgesehen ist, das heißt verteilt in diesem vorliegt, ist eine Beschädigung durch mechanische Beanspruchung, die bei einer reinen Beschichtung auftreten kann nicht zu befürchten. Zudem ist im Vergleich zu einer Beschichtung in der Regel die Materialstärke des Grundkörpers größer, so dass der Wärmetransport über eine größere Strecke in dem Material erfolgen kann. Weiterhin ist die Verwendung eines gefüllten Kunststoffs von Vorteil, da der Füllstoff verteilt in der Kunststoffmatrix vorliegt und so an der Oberfläche, die durch den Benutzer - gegebenenfalls durch eine Beschichtung - berührt wird, der Kontakt zwischen der Haut des Benutzers und dem Füllstoff gewährleitstet ist. Dadurch wird die Wärmeübertragung, die zur Erzeugung eines metallischen Gefühls notwendig ist, erzielt. Schließlich ist das Vorsehen von Füllstoff höherer Wärmeleitfähigkeit vorteilhaft, da dieser entsprechend der thermischen und mechanischen Anforderungen gezielt zugegeben werden kann und das Bedienelement somit entsprechend dem gewünschten Einsatz modifiziert werden kann. Insbesondere kann die Zusammensetzung und die Menge des Füllstoffs variiert werden. Somit kann beispielsweise der normalen Betriebstemperatur des Haushaltsgerätes im Bereich des Bedienelementes Rechnung getragen werden.Since the fillers are also provided in the plastic, that is distributed in this, damage due to mechanical stress, which can occur in a pure coating is not to be feared. In addition, in comparison to a coating, the material thickness of the main body is generally greater, so that the heat transfer can take place over a greater distance in the material. Furthermore, the use of a filled plastic is advantageous since the filler is distributed in the plastic matrix and so on the surface, which is touched by the user - optionally by a coating -, the contact between the skin of the user and the filler is gewährleitstet. This achieves the heat transfer necessary to create a metallic feel. Finally, the provision of filler of higher thermal conductivity is advantageous because it can be added specifically according to the thermal and mechanical requirements and the control can thus be modified according to the desired use. In particular, the composition and the amount of filler can be varied. Thus, for example, the normal operating temperature of the household appliance in the area of the operating element can be taken into account.

Der Füllstoff liegt vorzugsweise in Partikelform in dem Kunststoff des Grundkörpers vor. Insbesondere kann der Füllstoff als Kugeln, Körner, Fasern und/oder als Pulver vorliegen. Im Vergleich zu chemisch behandelten Kunststoffen, bei denen Zusatzstoffe chemisch gebunden sind, kann bei der erfindungsgemäß bevorzugten Form des Füllstoffs als Partikel, die gewünschte Wärmeleitfähigkeit des Materials des Grundkörpers einfacher und zuverlässiger eingestellt werden.The filler is preferably present in particle form in the plastic of the body. In particular, the filler may be present as spheres, grains, fibers and / or as a powder. Compared to chemically treated plastics, in which additives are chemically bonded, the desired thermal conductivity of the material of the base body can be adjusted in a simpler and more reliable manner in the preferred form of the filler according to the invention as a particle.

Das Material des Füllstoffs kann aus einer Vielzahl von Materialien gewählt werden, solange die Wärmeleitfähigkeit des Materials höher ist als die Wärmeleitfähigkeit des Kunststoffes, in die der Füllstoff eingebracht wird. Besonders bevorzugt werden erfindungsgemäß metallische Füllstoffe, insbesondere Kupfer-Pulver oder Aluminium-Pulver oder Edelstahl-Pulver, verwendet. Der Vorteil metallischer Füllstoffe liegt insbesondere in den geringen Anschaffungskosten und in deren mechanischer Festigkeit. Zudem sind metallische Füllstoffe und insbesondere Kupfer, beispielsweise in der Form von Pulver vorteilhaft, da diese und insbesondere ein mit diesem versetzter oder gefüllter Kunststoff mit Materialien wie Chrom oder Nickel auch galvanisch beschichtet werden können. Zudem weist Kupfer eine Wärmeleitfähigkeit von 400W/mK auf und somit reichen bereits geringere Mengen an Füllstoff aus, um eine gewünschte Wärmeleitfähigkeit des Materials des Grundkörpers des Bedienelementes zu erzielen.The material of the filler may be selected from a variety of materials as long as the thermal conductivity of the material is higher than the thermal conductivity of the plastic into which the filler is introduced. Particular preference is given to using metallic fillers according to the invention, in particular copper powder or aluminum powder or stainless steel powder. The advantage of metallic fillers is in particular the low acquisition costs and their mechanical strength. In addition, metallic fillers and, in particular, copper, for example in the form of powder, are advantageous since these, and in particular a plastic offset or filled with same, can also be galvanically coated with materials such as chromium or nickel. In addition, copper has a thermal conductivity of 400W / mK and thus already lower amounts of filler sufficient to achieve a desired thermal conductivity of the material of the main body of the control element.

Es liegt aber auch im Rahmen der Erfindung, zusätzlich oder alternativ, keramische Füllstoffe und/oder Glasfüllstoffe, wie beispielsweise Glaskugeln, und/oder Kohlenstofffüllstoffe, wie beispielsweise Graphit oder Diamant, zu verwenden. Weitere mögliche Füllstoffe umfassen Aluminiumnitrid oder Bornitrid.However, it is also within the scope of the invention, additionally or alternatively, ceramic fillers and / or glass fillers, such as glass beads, and / or carbon fillers, such as graphite or diamond to use. Other possible fillers include aluminum nitride or boron nitride.

Vorzugsweise weist das Material des Grundkörpers eine Wärmeleitfähigkeit von 0,5 bis 30 W/mK, vorzugsweise von 1 bis 20 W/mK, auf. Als das Material des Grundkörpers wird der Kunststoff mit dem darin aufgenommenen beziehungsweise eingebrachten Füllstoff bezeichnet. Diese Wärmeleitfähigkeit kann eingestellt werden, indem das Material der Füllstoffe und deren Menge entsprechend gewählt werden. Die Wärmeleitfähigkeit des Materials des Grundkörpers ist vorzugsweise im Vergleich zu einem reinen Kunststoffgrundkörper erhöht, im Vergleich zu reinen Metallgrundkörpern aber wesentlich niedriger. Ein Vorteil dieser mittleren Wärmeleitfähigkeit, besteht darin, dass das Bedienelement auch bei Haushaltsgeräten verwendet werden kann, bei denen die Betriebstemperatur im Bereich des Bedienelementes hoch ist. Solche Haushaltsgeräte sind beispielsweise Gaskochstellen, die in Herden integriert sein können oder als separates Haushaltsgerät vorliegen können. Durch die relativ geringe Wärmeleitfähigkeit im Vergleich zu Metallgrundkörpern kann eine Verletzung des Benutzers, insbesondere ein Verbrennen ausgeschlossen werden. Andererseits ist das Tastempfinden bei dieser bevorzugten Wärmeleitfähigkeit näher an dem eines metallischen Grundköpers als bei einem rein aus Kunststoff bestehenden Grundkörper. Mit der erfindungsgemäß erreichbaren mittleren Wärmeleitfähigkeit des Materials des Grundkörpers des erfindungsgemäßen Bedienelementes kann dieses somit bis zu 100fach stärker wärmeleitend ist als ungefüllter Kunststoff sein.Preferably, the material of the base body has a thermal conductivity of 0.5 to 30 W / mK, preferably from 1 to 20 W / mK. As the material of the main body of the plastic is referred to with the incorporated or introduced filler. This thermal conductivity can be adjusted by selecting the material of the fillers and their amount accordingly. The thermal conductivity of the material of the body is preferably increased compared to a pure plastic body, but much lower compared to pure metal bodies. An advantage of this average thermal conductivity is that the operating element can also be used in household appliances in which the operating temperature in the region of the operating element is high. Such household appliances are, for example, gas cookers, which may be integrated in ovens or may be present as a separate household appliance. Due to the relatively low thermal conductivity compared to metal bodies, injury to the user, in particular burning, can be ruled out. On the other hand, the tactile sensation in this preferred thermal conductivity is closer to that of a Metallic Grundköpers than in a purely plastic base body. With the inventively achievable average thermal conductivity of the material of the main body of the control element according to the invention this can thus be up to 100 times more thermally conductive than unfilled plastic.

Gemäß einer Ausführungsform beträgt der Volumenanteil des Füllstoffs in dem Material des Grundkörpers weniger als 70%, vorzugsweise weniger als 50%. Diese Menge an Füllstoffen hat sich insbesondere bei Füllstoffen als vorteilhaft erwiesen, die Kupfer enthalten oder aus Kupfer bestehen. Durch diese Menge an Füllstoffen können die Eigenschaften des Matrixmaterials des Grundkörpers, das heißt des Kunststoffes, und die des Füllstoffes optimal kombiniert werden.According to one embodiment, the volume fraction of the filler in the material of the main body is less than 70%, preferably less than 50%. This amount of fillers has proven to be particularly advantageous in fillers containing copper or made of copper. By this amount of fillers, the properties of the matrix material of the body, that is the plastic, and those of the filler can be optimally combined.

Der Kunststoff des Grundkörpers stellt vorzugsweise einen thermoplastischen Kunststoff dar. Gemäß einer bevorzugten Ausführungsform, umfasst der Kunststoff des Grundkörpers, das mit den Füllstoffen versetzt wird, technische Polymere, insbesondere Polyamide.The plastic of the base body preferably represents a thermoplastic. According to a preferred embodiment, the plastic of the base body, which is mixed with the fillers, comprises technical polymers, in particular polyamides.

Als technische Polymere werden unter anderem folgende Polymere bezeichnet. Polyamide (PA), ABS (Acrylnitril-Butadien-Styorl), das mit Copolymercarbonaten versetzt werden kann, und für die Beschichtung, insbesondere mit metallischen Beschichtungen, geeignet ist. Weitere Beispiele für technische Polymere sind PBT (Polybutylentherephtalat), Polycarbonate (PC), Polyoxymethylen (POM), Polypropylen (PP), Polystyrol (PS) und dergleichen.As technical polymers, inter alia, the following polymers are referred to. Polyamides (PA), ABS (acrylonitrile-butadiene-styrene), which can be mixed with copolymeric carbonates, and for the coating, especially with metallic coatings, is suitable. Further examples of engineering polymers are PBT (polybutylene terephthalate), polycarbonates (PC), polyoxymethylene (POM), polypropylene (PP), polystyrene (PS) and the like.

Polyamide sind erfindungsgemäß bevorzugt. Es hat sich gezeigt, dass Polyamide mit Füllstoffen entsprechend der vorliegenden Erfindung, insbesondere mit Kupfer-Pulver, eine Eignung zur Beschichtung, insbesondere mit metallischen Beschichtungen, aufweisen.Polyamides are preferred according to the invention. It has been found that polyamides with fillers according to the present invention, in particular with copper powder, have a suitability for coating, in particular with metallic coatings.

Gemäß einer Ausführungsform des Bedienelementes ist der Grundkörper des Bedienelementes beschichtet. Die Beschichtung stellt hierbei vorzugsweise eine metallische Beschichtung dar. Indem der Grundkörper aus einem Kunststoff mit Füllstoff höherer Wärmeleitfähigkeit besteht, ist die metallische Beschichtung nicht mehr alleine für die Vermittlung eines metallischen Gefühls beim Berühren des Bedienelementes verantwortlich. Die Dicke der Beschichtung kann daher minimiert werden. Die Beschichtung weist vorzugsweise eine Dicke von weniger als 0,1mm auf. Die Beschichtung kann zum Beispiel eine galvanische Beschichtung mit Nickel oder Chrom sein. Zudem wird durch die metallische Beschichtung der optische Eindruck des Bedienelementes verbessert und insbesondere ein metallisches Aussehen erzeugt wird.According to one embodiment of the operating element of the main body of the control element is coated. In this case, the coating preferably represents a metallic coating. By virtue of the base body being made of a plastic with a filler of higher thermal conductivity, the metallic coating is no longer solely responsible for imparting a metallic feel when the operating element is touched. The thickness of the coating can therefore be minimized. The coating preferably has a thickness of less than 0.1 mm. The coating may be, for example, a nickel or chromium plating. In addition, the visual impression of the operating element is improved by the metallic coating and, in particular, a metallic appearance is produced.

Vorzugsweise stellt das Bedienelement einen Bedienknebel dar. Als Bedienknebel wird ein Bedienelement bezeichnet, das in der Regel durch Drehbewegung und gegebenenfalls zusätzlich durch axiale Bewegung betätigt wird. Bei einer Drehbewegung ist der Benutzer für längere Zeit mit dem Bedienelement in Kontakt, so dass hierbei die Vorteile des erfindungsgemäßen Bedienelementes besonders zum Tragen kommen.Preferably, the control element is a control knob. As a control knob, an operating element is referred to, which is usually actuated by rotational movement and optionally in addition by axial movement. During a rotational movement, the user is in contact with the operating element for a longer time, so that in this case the advantages of the operating element according to the invention come into play in particular.

Das erfindungsgemäße Bedienelement kann ein Spritzgussteil darstellen. Durch die Verwendung von Kunststoff als Matrixmaterial für den Grundkörper können durch Spritzguss auf einfache Weise auch komplexe Formen des Bedienelements hergestellt werden. Der Spritzguss thermisch leitfähiger Kunststoffe, insbesondere der erfindungsgemäß verwendeten Kunststoffe mit Füllstoffen, unterscheidet sich vom Spritzguss der reinen Polymermatrix. Durch das Füllen des Kunststoffes mit Partikeln und dem Ansteigen der Wärmeleitfähigkeit der Kunststoffmasse findet ein beschleunigter Transport der thermischen Energie vom Kunststoff in das kältere Werkzeug statt. Das gefüllte Polymer erstarrt im Randbereich schneller und verengt Fließwege und Kavitäten. Genau wie das Werkzeug werden daher bei der Herstellung eines erfindungsgemäßen Bedienelementes die Prozessführung und die Prozessparameter an diese veränderten Werkstoffeigenschaften angepasst. Insbesondere werden vorzugsweise zusätzlich zu der Werkzeugtemperatur auch die Einspritzgeschwindigkeit und der Einspritzdruck im Vergleich zu Prozessen mit reinem Kunststoff erhöht.The control element according to the invention can represent an injection molded part. By using plastic as the matrix material for the base body, complex shapes of the control element can be easily produced by injection molding become. The injection molding of thermally conductive plastics, in particular of the plastics with fillers used according to the invention, differs from the injection molding of the pure polymer matrix. By filling the plastic with particles and the increase in the thermal conductivity of the plastic mass is an accelerated transport of thermal energy from the plastic into the colder tool instead. The filled polymer solidifies faster in the edge area and narrows flow paths and cavities. Just like the tool, the process control and the process parameters are therefore adapted to these changed material properties in the production of a control element according to the invention. In particular, in addition to the mold temperature, the injection speed and the injection pressure are preferably increased in comparison to processes with pure plastic.

Gemäß einem weiteren Aspekt betrifft die Erfindung ein Haushaltsgerät mit mindestens einem Bedienelement, wobei mindestens eines der Bedienelemente ein erfindungsgemäßes Bedienelement darstellt. Insbesondere weist das Bedienelement einen Grundkörper aus Kunststoff auf, wobei der Kunststoff mit Füllstoff versetzt ist, der eine höhere Wärmeleitfähigkeit als der Kunststoff aufweist.According to a further aspect, the invention relates to a household appliance with at least one control element, wherein at least one of the control elements represents an inventive control element. In particular, the control element on a base made of plastic, wherein the plastic is mixed with filler, which has a higher thermal conductivity than the plastic.

Gemäß einer bevorzugten Ausführungsform stellt das Haushaltsgerät eine Kochstelle, insbesondere eine Gaskochstelle, dar. Bei dieser Art eines Haushaltsgerätes kommen die Vorteile der vorliegenden Erfindung, insbesondere die einstellbare beziehungsweise eingestellte Wärmeleitfähigkeit des Bedienelementes, besonders zum Tragen.According to a preferred embodiment, the household appliance represents a cooking point, in particular a gas hob. In this type of household appliance, the advantages of the present invention, in particular the adjustable or set thermal conductivity of the control element, come particularly to bear.

Vorteile und Merkmale, die bezüglich des erfindungsgemäßen Bedienelementes beschrieben werden, gelten - soweit anwendbar - entsprechend für das erfindungsgemäße Haushaltsgerät und umgekehrt.Advantages and features that are described with respect to the control element according to the invention apply - as far as applicable - accordingly for the household appliance according to the invention and vice versa.

Die Erfindung wird im Folgenden erneut unter Bezugnahme auf die beiliegenden Zeichnungen erläutert. Hierbei zeigen:

Figur 1:
eine schematische Schnittansicht eines Bedienelements gemäß einer Ausführungsform der vorliegenden Erfindung; und
Figur 2:
eine schematische, perspektivische Unteransicht des Bedienelements nach Figur 1.
The invention will be explained again below with reference to the accompanying drawings. Hereby show:
FIG. 1:
a schematic sectional view of a control element according to an embodiment of the present invention; and
FIG. 2:
a schematic, perspective bottom view of the control element according to FIG. 1 ,

In Figur 1 ist eine schematische Schnittansicht einer Ausführungsform eines erfindungsgemäßen Bedienelements 1 gezeigt. Dieses besteht in der dargestellten Ausführungsform aus einem Grundkörper 10 und einem Achsteil 11. Der Grundkörper 10 ist an dessen Außenseite mit einer Beschichtung 12 versehen. Obwohl der Grundkörper 10 und das Achsteil 11 in der dargestellten Ausführungsform als separate Bauteile gezeigt sind, liegt es im Rahmen der Erfindung, dass diese ein integrales, das heißt ein einziges, Bauteil bilden.In FIG. 1 is a schematic sectional view of an embodiment of an operating element 1 according to the invention shown. In the illustrated embodiment, this consists of a main body 10 and an axle 11. The main body 10 is provided with a coating 12 on its outer side. Although the main body 10 and the axle 11 are shown as separate components in the illustrated embodiment, it is within the scope of the invention that they form an integral, that is a single, component.

Das Bedienelement 1 stellt in der dargestellten Ausführungsform einen rotationssymmetrischen Bedienknebel dar, der um die Drehachse D des Achsteils 11 gedreht werden kann. An einem axialen Ende ist der Bedienknebel 1 durch einen Deckel verschlossen, der in der dargestellten Ausführungsform einen Teil des Grundkörpers 10 darstellt. An dem gegenüberliegenden axialen Ende ist das Achsteil 11 vorgesehen, über das das Bedienelement 1 mit weiteren Elementen, wie beispielsweise einer Betätigungsachse (nicht gezeigt) verbunden werden kann. An dem äußeren Umfang der Mantelfläche des Grundkörpers 10 und an dem durch den Deckel geschlossenen axialen Ende ist der Grundkörper 10 mit einer Beschichtung 12 versehen. An dem äußeren Umfang des Bedienknebels 1 sind an dem geschlossenen Ende zudem Nuten 13 eingebracht, die eine Drehung des Bedienknebels 1 für den Benutzer erleichtern.The control element 1 is in the illustrated embodiment, a rotationally symmetrical control knob, which can be rotated about the axis of rotation D of the axle 11. At one axial end of the control knob 1 is closed by a lid, which represents a part of the base body 10 in the illustrated embodiment. At the opposite axial end of the axle member 11 is provided, via which the control element 1 with other elements, such as an actuating shaft (not shown) can be connected. At the outer periphery of the lateral surface of the base body 10 and at the axial end closed by the cover, the base body 10 is provided with a coating 12. At the outer periphery of the control knob 1 grooves 13 are also introduced at the closed end, which facilitate rotation of the control knob 1 for the user.

Vorteile der vorliegenden Erfindung sind unter anderem ein edles Aussehen, zum Beispiels Edelstahl gebürstet. Zudem weist ein erfindungsgemäßes Bedienelement, insbesondere ein erfindungsgemäßer Bedienknebel einen "cool touch"-Effekt auf. Gegenüber einem reinen Metallknebel sind mit dem erfindungsgemäßen Bedienelement zudem höhere Betriebstemperaturen zulässig.Advantages of the present invention include a noble appearance, brushed stainless steel, for example. In addition, an inventive control element, in particular a control knob according to the invention has a "cool touch" effect. Compared to a pure metal gag, the operating element according to the invention also allows higher operating temperatures.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Bedienelementoperating element
1010
Grundkörperbody
1111
Achsteilaxle
1212
Beschichtungcoating
1313
Nutengroove
DD
Drehachse BedienelementRotary axis control element

Claims (12)

  1. Operating element for a domestic appliance, wherein the operating element (1) has a main body (10) made of plastic, characterised in that the plastic is admixed with filler, which has a higher thermal conductivity than the plastic.
    Admixed with filler here refers to a plastic in which filler is held or incorporated in a plastic matrix.
  2. Operating element according to claim 1, characterised in that the filler is present in particle form, in particular as spheres, grains, fibres or as powder.
  3. Operating element according to one of claims 1 or 2, characterised in that the filler comprises metal fillers, in particular powdered copper, aluminium or stainless steel, and/or ceramic fillers and/or glass fillers and/or carbon fillers.
  4. Operating element according to one of claims 1 to 3, characterised in that the material of the main body (10) has a thermal conductivity of 1 to 20 W/mK.
  5. Operating element according to one of claims 1 to 4, characterised in that the proportion by volume of filler in the material of the main body (10) is less than 70%, preferably less than 50%.
  6. Operating element according to one of claims 1 to 5, characterised in that the plastic of the main body (10), which is admixed with filler, comprises a technical polymer, in particular polyamide.
  7. Operating element according to one of claims 1 to 6, characterised in that the main body (10) of the operating element (1) is coated.
  8. Operating element according to claim 7, characterised in that the coating is a metal coating (12).
  9. Operating element according to one of claims 1 to 8, characterised in that the operating element (1) is an operating knob.
  10. Operating element according to one of claims 1 to 9, characterised in that the operating element (1) is an injection moulded part.
  11. Domestic appliance having at least one operating element, characterised in that at least one of the operating elements is an operating element according to one of claims 1 to 10.
  12. Domestic appliance according to claim 11, characterised in that it is a cooktop, in particular a gas cooktop.
EP12711653.1A 2011-04-11 2012-04-03 Control element and a household device Active EP2697568B1 (en)

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PL12711653T PL2697568T3 (en) 2011-04-11 2012-04-03 Control element and a household device
EP12711653.1A EP2697568B1 (en) 2011-04-11 2012-04-03 Control element and a household device

Applications Claiming Priority (3)

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EP11290185 2011-04-11
PCT/EP2012/056031 WO2012139926A1 (en) 2011-04-11 2012-04-03 Operator control element and domestic appliance
EP12711653.1A EP2697568B1 (en) 2011-04-11 2012-04-03 Control element and a household device

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EP2697568A1 EP2697568A1 (en) 2014-02-19
EP2697568B1 true EP2697568B1 (en) 2016-11-30

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CN (1) CN103459931A (en)
ES (1) ES2609777T3 (en)
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US20140013897A1 (en) 2014-01-16
WO2012139926A1 (en) 2012-10-18
CN103459931A (en) 2013-12-18
EP2697568A1 (en) 2014-02-19
PL2697568T3 (en) 2017-04-28
US10331160B2 (en) 2019-06-25
ES2609777T3 (en) 2017-04-24

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