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EP2189997A1 - Switching device - Google Patents

Switching device Download PDF

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Publication number
EP2189997A1
EP2189997A1 EP09013820A EP09013820A EP2189997A1 EP 2189997 A1 EP2189997 A1 EP 2189997A1 EP 09013820 A EP09013820 A EP 09013820A EP 09013820 A EP09013820 A EP 09013820A EP 2189997 A1 EP2189997 A1 EP 2189997A1
Authority
EP
European Patent Office
Prior art keywords
sealing element
switching
switching elements
switching device
heating
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.)
Granted
Application number
EP09013820A
Other languages
German (de)
French (fr)
Other versions
EP2189997B1 (en
Inventor
Rhys Jones
Stephen Newton
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.)
Linde Material Handling GmbH
Original Assignee
Linde Material Handling 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 Linde Material Handling GmbH filed Critical Linde Material Handling GmbH
Publication of EP2189997A1 publication Critical patent/EP2189997A1/en
Application granted granted Critical
Publication of EP2189997B1 publication Critical patent/EP2189997B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/7006—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard comprising a separate movable contact element for each switch site, all other elements being integrated in layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/86—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the casing, e.g. sealed casings or casings reducible in size
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2223/00—Casings
    • H01H2223/002—Casings sealed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/034—Environmental protection
    • H01H2239/036—Heating, e.g. against condensation

Definitions

  • the invention relates to a switching device having a housing cover, the recesses for relative to the housing cover movable switching elements, a arranged below the housing cover, the switching elements supporting or bearing, flat sealing element and a arranged below the sealing element switching contact surface element, wherein by transmitting the relative movement of the switching elements on the planar sealing element a contact on the switching contact surface element can be produced.
  • switching devices are used in which electrical pulses are triggered by actuation of switching elements.
  • key switches are widely used in which control commands are executed by pressing keys arranged in recesses of a housing cover.
  • Such switching devices are also used, for example, in industrial trucks to perform certain operations such as e.g. the switching on and off of drives or the actuation of safety devices.
  • industrial trucks which are operated at low ambient temperatures or in ambient conditions with high temperature fluctuations, for example within cold stores, it may lead to the formation of condensation in the recesses for the switching elements. Thereby, the mechanical mobility of the switching elements can be limited, so that the control commands can not be performed reliably.
  • a switching device which has a housing cover with recesses for the switching elements embodied, for example, as keys, a planar sealing element arranged therebelow, for example as a membrane, and a sealing element provided underneath the sealing element, Has switching contact surface element with printed electrical circuits. Immediately below the sheet-like sealing element, a heater is mounted.
  • the present invention has for its object, a switching device of the type mentioned in such a way that a reliable heating of the switching elements is ensured.
  • This object is achieved in that a heating device for the switching elements is provided on the flat sealing element or above the flat sealing element.
  • the heater In contrast to the known heated switching devices so the heater is not located below the flat sealing element, but on it or above. Thus, the heat transfer from the heater to the switching elements is no longer affected by the intermediate, planar sealing element.
  • recordings for the heating device are provided on the side of the housing cover facing the planar sealing element.
  • These receptacles are expediently designed as channels which surround the recesses for the switching elements.
  • the heating device comprises electrical heating wires which are fitted in the channels.
  • the heating wires can already be inserted into the channels of the housing cover. But they can also be applied according to a particularly advantageous variant on the sheet-like sealing element, so that they after assembly of the Switching device come to rest in the channels of the housing cover.
  • the heating wires may be incorporated in the sealing element or, for example, printed on the surface of the sealing element. The sealing properties of the flat sealing element are not diminished by the additional heating device. After assembly of the switching device, the channels for the heating wires are sealed by the sealing element.
  • the heating device alternatively or additionally directly below the switching elements arranged heating elements.
  • These heating elements may for example be punctiform and be supplied directly or by induction with electrical energy.
  • the heater is in the form of a heating matrix, which is preferably formed by a nickel-aluminum wire, to which an electric current is applied.
  • a heating matrix which is preferably formed by a nickel-aluminum wire, to which an electric current is applied.
  • wires have a particularly high temperature resistance.
  • the switching device is expediently designed as a keypad with key switches, wherein the switching elements are designed as keys which act in a depressed state on them associated contacts on the preferably as an electrical circuit board with printed electrical circuits (PCB: "printed circuit board”) formed Wegmorillonelement.
  • PCB printed circuit board
  • planar sealing element is preferably formed as a membrane, in which the keys are integrated in the form of flexible pressure caps.
  • the switching elements are designed as slide switches or toggle switches.
  • the switching device according to the invention is particularly suitable for use under difficult conditions at low ambient temperatures or at ambient conditions with high temperature fluctuations. With particular advantage, therefore, the switching device as a control device of a truck intended.
  • the housing of the switching device reliably protected against the ingress of dirt, oil, water, etc., and on the other hand reliably prevents freezing of the switching elements as a result of freezing condensation. As a result, the overall functionality of the switching device is guaranteed even in difficult environmental conditions.
  • FIG. 1 a key switching device is shown with a housing cover 1, which in particular has rectangular recesses 7 for keys. Underneath is formed a membrane formed as a flat sealing element 2, which carries flexible formed as keycaps pressure caps, which engage in the assembly of the key switching device in the recesses of the housing cover 1 and form as buttons formed switching elements.
  • the membrane rests on a switch contact surface element 3, which is designed as a printed circuit board (PCB) printed circuit board.
  • PCB printed circuit board
  • FIG. 2 a housing cover 1 is shown, which is provided for an equipment with a heating device according to the invention. These are around each recess 7 incorporated for the keys channels 5, in the heating wires 6, in particular in the form of a heating matrix, can be fitted or inserted. After inserting or fitting the heating wires 6 formed by the heating matrix into the channels 5 of the housing cover 1, the heating device is thus located directly in the region of the keycaps and above the planar sealing element 2.

Landscapes

  • Push-Button Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Abstract

The device has a housing cover (1) with recesses (7) for switching elements i.e. buttons, which are movable relative to the cover. A laminar sealing element (2) i.e. membrane, is arranged within the cover. A switching contact surface element (3) i.e. electrical conductor plate, is arranged within the sealing element. A contact to the surface element is made by relative motion of the switching elements over the sealing element. A heating device i.e. heating matrix, is provided on or above the sealing element. Channels are present on a side turned towards the sealing element.

Description

Die Erfindung betrifft eine Schalteinrichtung mit einer Gehäuseabdeckung, die Ausnehmungen für relativ zur Gehäuseabdeckung bewegliche Schaltelemente aufweist, einem unterhalb der Gehäuseabdeckung angeordneten, die Schaltelemente abstützenden oder tragenden, flächigen Dichtungselement und einem unterhalb des Dichtungselements angeordneten Schaltkontaktflächenelement, wobei durch Übertragung der Relativbewegung der Schaltelemente über das flächige Dichtungselement ein Kontakt auf dem Schaltkontaktflächenelement herstellbar ist.The invention relates to a switching device having a housing cover, the recesses for relative to the housing cover movable switching elements, a arranged below the housing cover, the switching elements supporting or bearing, flat sealing element and a arranged below the sealing element switching contact surface element, wherein by transmitting the relative movement of the switching elements on the planar sealing element a contact on the switching contact surface element can be produced.

Zum Betreiben von elektrisch gesteuerten Geräten jeglicher Art werden Schalteinrichtungen verwendet, bei denen durch Betätigung von Schaltelementen elektrische Impulse ausgelöst werden. Weit verbreitet sind beispielsweise Tastenschalter, bei denen durch Drücken von in Ausnehmungen einer Gehäuseabdeckung angeordneten Tasten, Steuerbefehle ausgeführt werden. Solche Schalteinrichtungen werden zum Beispiel auch in Flurförderzeugen eingesetzt, um bestimmte Arbeitsvorgänge wie z.B. das Ein- und Ausschalten von Antrieben oder die Betätigung von Sicherheitseinrichtungen, auszuführen. Bei Flurförderzeugen, die bei niedrigen Umgebungstemperaturen oder bei Umgebungsbedingungen mit hohen Temperaturschwankungen, beispielsweise innerhalb von Kühlhäusern, betrieben werden, kann es zur Bildung von Kondenswasser in den Ausnehmungen für die Schaltelemente kommen. Dadurch kann die mechanische Beweglichkeit der Schaltelemente eingeschränkt werden, so dass die Steuerbefehle nicht mehr zuverlässig ausgeführt werden können.To operate electrically controlled devices of any kind switching devices are used in which electrical pulses are triggered by actuation of switching elements. For example, key switches are widely used in which control commands are executed by pressing keys arranged in recesses of a housing cover. Such switching devices are also used, for example, in industrial trucks to perform certain operations such as e.g. the switching on and off of drives or the actuation of safety devices. In industrial trucks, which are operated at low ambient temperatures or in ambient conditions with high temperature fluctuations, for example within cold stores, it may lead to the formation of condensation in the recesses for the switching elements. Thereby, the mechanical mobility of the switching elements can be limited, so that the control commands can not be performed reliably.

Es sind bereits beheizte Schalteinrichtungen bekannt, die sich allerdings insbesondere für die bei Flurförderzeugen vorkommenden erschwerten Bedingungen nur begrenzt eignen. Beispielsweise ist in der EP 0 444 914 A2 eine Schalteinrichtung beschrieben, die eine Gehäuseabdeckung mit Ausnehmungen für die z.B. als Tasten ausgebildeten Schaltelemente, ein darunter angeordnetes z.B. als Membran ausgeführtes, flächiges Dichtungselement sowie ein unterhalb des Dichtungselements vorgesehenes, Schaltkontaktflächenelement mit gedruckten elektrischen Schaltkreisen aufweist. Unmittelbar unter dem flächigen Dichtungselement ist eine Heizeinrichtung angebracht.There are already known heated switching devices, which are, however, only limited, especially for the difficult conditions occurring in industrial trucks. For example, in the EP 0 444 914 A2 a switching device is described, which has a housing cover with recesses for the switching elements embodied, for example, as keys, a planar sealing element arranged therebelow, for example as a membrane, and a sealing element provided underneath the sealing element, Has switching contact surface element with printed electrical circuits. Immediately below the sheet-like sealing element, a heater is mounted.

Bei Schalteinrichtungen, die für einen Einsatz unter erschwerten Bedingungen vorgesehen sind, wird auf eine zuverlässige Abdichtung Wert gelegt, um ein Eindringen von Staub, Wasser, Öl etc. in das Gehäuse zu verhindern. Moderne Schalteinrichtungen weisen deshalb z.B. als Gummimembran ausgebildete flächige Dichtelemente auf. Derartige Dichtelemente wirken allerdings auch als Wärmeisolatoren, die eine ausreichende Wärmeübertragung von der unterhalb des Dichtelements angeordneten Heizeinrichtung zu den Schaltelementen verhindern.For switching devices intended for use in difficult conditions, emphasis is placed on reliable sealing in order to prevent the penetration of dust, water, oil etc. into the housing. Modern switching devices therefore have e.g. formed as a rubber membrane surface sealing elements. However, such sealing elements also act as heat insulators which prevent sufficient heat transfer from the arranged below the sealing element heater to the switching elements.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Schalteinrichtung der eingangs genannten Art so auszugestalten, dass eine zuverlässige Beheizung der Schaltelemente gewährleistet ist.The present invention has for its object, a switching device of the type mentioned in such a way that a reliable heating of the switching elements is ensured.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass auf dem flächigen Dichtungselement oder oberhalb des flächigen Dichtungselements eine Heizeinrichtung für die Schaltelemente vorgesehen ist.This object is achieved in that a heating device for the switching elements is provided on the flat sealing element or above the flat sealing element.

Im Gegensatz zu den bekannten beheizten Schalteinrichtungen ist also die Heizeinrichtung nicht unterhalb des flächigen Dichtungselements angeordnet, sondern darauf oder darüber. Somit wird der Wärmeübergang von der Heizeinrichtung zu den Schaltelementen nicht mehr durch das dazwischen liegende, flächige Dichtungselement beeinträchtigt.In contrast to the known heated switching devices so the heater is not located below the flat sealing element, but on it or above. Thus, the heat transfer from the heater to the switching elements is no longer affected by the intermediate, planar sealing element.

Vorzugsweise sind auf der dem flächigen Dichtungselement zugewandten Seite der Gehäuseabdeckung Aufnahmen für die Heizeinrichtung vorgesehen. Diese Aufnahmen sind zweckmäßigerweise als Kanäle ausgebildet, die die Ausnehmungen für die Schaltelemente umgeben.Preferably, recordings for the heating device are provided on the side of the housing cover facing the planar sealing element. These receptacles are expediently designed as channels which surround the recesses for the switching elements.

Gemäß einer besonders bevorzugten Ausführungsform der Erfindung umfasst die Heizeinrichtung elektrische Heizdrähte, die in die Kanäle eingepasst sind. Dabei können die Heizdrähte bereits in die Kanäle der Gehäuseabdeckung eingelegt sein. Sie können aber auch gemäß einer besonders vorteilhaften Variante auf dem flächigen Dichtungselement aufgebracht sein, so dass sie nach dem Zusammenbau der Schalteinrichtung in den Kanälen der Gehäuseabdeckung zu liegen kommen. Die Heizdrähte können in das Dichtungselement eingearbeitet sein oder z.B. auf die Oberfläche des Dichtungselements aufgedruckt sein. Die Dichtungseigenschaften des flächigen Dichtungselements werden dabei durch die zusätzliche Heizeinrichtung nicht geschmälert. Nach dem Zusammenbau der Schalteinrichtung sind die Kanäle für die Heizdrähte durch das Dichtungselement abgedichtet.According to a particularly preferred embodiment of the invention, the heating device comprises electrical heating wires which are fitted in the channels. The heating wires can already be inserted into the channels of the housing cover. But they can also be applied according to a particularly advantageous variant on the sheet-like sealing element, so that they after assembly of the Switching device come to rest in the channels of the housing cover. The heating wires may be incorporated in the sealing element or, for example, printed on the surface of the sealing element. The sealing properties of the flat sealing element are not diminished by the additional heating device. After assembly of the switching device, the channels for the heating wires are sealed by the sealing element.

Gemäß einer Weiterbildung des Erfindungsgedankens weist die Heizeinrichtung alternativ oder zusätzlich direkt unter den Schaltelementen angeordnete Heizelemente auf. Diese Heizelemente können beispielsweise punktförmig ausgebildet sein und direkt oder mittels Induktion mit elektrischer Energie versorgt werden.According to a development of the inventive concept, the heating device alternatively or additionally directly below the switching elements arranged heating elements. These heating elements may for example be punctiform and be supplied directly or by induction with electrical energy.

Als Heizeinrichtung kann jede Einrichtung verwendet werden, die eine Wärmezufuhr zu den Schaltelementen bzw. zu den Ausnehmungen für die Schaltelemente gewährleistet. Zweckmäßigerweise ist die Heizeinrichtung in Form einer Heizmatrix ausgeführt, die bevorzugterweise von einem Nickelaluminium-Draht gebildet wird, an den ein elektrischer Strom angelegt wird. Solche Drähte weisen eine besonders hohe Temperaturwiderstandsfähigkeit auf.As a heater, any device can be used which ensures a supply of heat to the switching elements or to the recesses for the switching elements. Conveniently, the heater is in the form of a heating matrix, which is preferably formed by a nickel-aluminum wire, to which an electric current is applied. Such wires have a particularly high temperature resistance.

Die Schalteinrichtung ist zweckmäßigerweise als Tastenfeld mit Tastenschaltern ausgeführt, wobei die Schaltelemente als Tasten ausgebildet sind, die in niedergedrücktem Zustand auf ihnen zugeordnete Kontakte auf dem vorzugsweise als elektrische Leiterplatte mit gedruckten elektrischen Schaltungen (PCB: "printed circuit board") ausgebildeten Schaltkontaktflächenelement einwirken.The switching device is expediently designed as a keypad with key switches, wherein the switching elements are designed as keys which act in a depressed state on them associated contacts on the preferably as an electrical circuit board with printed electrical circuits (PCB: "printed circuit board") formed Schaltkontaktflächenelement.

In diesem Fall ist das flächige Dichtungselement bevorzugt als Membran ausgebildet, in die die Tasten in Form von flexiblen Druckkappen integriert sind.In this case, the planar sealing element is preferably formed as a membrane, in which the keys are integrated in the form of flexible pressure caps.

Denkbar ist auch, dass die Schaltelemente als Schiebeschalter oder Kippschalter ausgebildet sind.It is also conceivable that the switching elements are designed as slide switches or toggle switches.

Die erfindungsgemäße Schalteinrichtung eignet sich insbesondere für einen Einsatz unter erschwerten Bedingungen bei niedrigen Umgebungstemperaturen oder bei Umgebungsbedingungen mit hohen Temperaturschwankungen. Mit besonderem Vorteil ist daher die Schalteinrichtung als Bedieneinrichtung eines Flurförderzeugs vorgesehen. Die besonderen Einsatzbedingungen von Flurförderzeugen z.B. in Kühlhäusern stellen an die Bedieneinrichtung eines Flurförderzeugs erhöhte Anforderungen, die durch die Erfindung optimal erfüllt werden können. Dabei wird mit der Erfindung einerseits das Gehäuse der Schalteinrichtung zuverlässig gegen das Eindringen von Schmutz, Öl, Wasser etc. geschützt und andererseits ein Einfrieren der Schaltelemente in Folge von gefrierendem Kondenswasser sicher verhindert. Dadurch wird insgesamt die Funktionsfähigkeit der Schalteinrichtung auch bei schwierigen Umgebungsbedingungen gewährleistet.The switching device according to the invention is particularly suitable for use under difficult conditions at low ambient temperatures or at ambient conditions with high temperature fluctuations. With particular advantage, therefore, the switching device as a control device of a truck intended. The particular conditions of use of industrial trucks, for example in cold stores, place increased demands on the operating device of a truck, which can be optimally fulfilled by the invention. In this case, with the invention on the one hand, the housing of the switching device reliably protected against the ingress of dirt, oil, water, etc., and on the other hand reliably prevents freezing of the switching elements as a result of freezing condensation. As a result, the overall functionality of the switching device is guaranteed even in difficult environmental conditions.

Weitere Vorteile und Einzelheiten der Erfindung werden anhand der in den schematischen Figuren dargestellten Ausführungsbeispiele näher erläutert. Hierbei zeigen

Figur 1
eine dreidimensionale Darstellung der Bauteile einer Tastenschalteinrichtung vor deren Zusammenbau und
Figur 2
eine dreidimensionale Darstellung einer Gehäuseabdeckung einer Tastenschalteinrichtung mit einer erfindungsgemäßen Heizeinrichtung.
Further advantages and details of the invention will be explained in more detail with reference to the embodiments illustrated in the schematic figures. Show here
FIG. 1
a three-dimensional representation of the components of a key switching device before assembling and
FIG. 2
a three-dimensional representation of a housing cover a key switching device with a heating device according to the invention.

In Figur 1 ist eine Tastenschalteinrichtung mit einer Gehäuseabdeckung 1 gezeigt, die insbesondere rechteckförmige Ausnehmungen 7 für Tasten aufweist. Darunter ist ein als Membran ausgebildetes flächiges Dichtungselement 2 angeordnet, das flexible als Tastenkappen ausgebildete Druckkappen trägt, welche beim Zusammenbau der Tastenschalteinrichtung in die Ausnehmungen der Gehäuseabdeckung 1 eingreifen und als Tasten ausgebildete Schaltelemente bilden. Die Membran liegt auf einem Schaltkontaktflächenelement 3 auf, das als Flachbaugruppe mit gedruckten elektrischen Schaltkreisen (PCB: "printed circuit board") ausgeführt ist. Das Schaltkontaktflächenelement 3 stützt sich schließlich auf einer Grundplatte 4 ab. Beim Drücken der Druckkappen stellen diese auf dem darunter liegenden Schaltkontaktflächenelement 3 elektrische Kontakte her, welche bestimmte Steuerbefehle auslösen.In FIG. 1 a key switching device is shown with a housing cover 1, which in particular has rectangular recesses 7 for keys. Underneath is formed a membrane formed as a flat sealing element 2, which carries flexible formed as keycaps pressure caps, which engage in the assembly of the key switching device in the recesses of the housing cover 1 and form as buttons formed switching elements. The membrane rests on a switch contact surface element 3, which is designed as a printed circuit board (PCB) printed circuit board. The switching contact surface element 3 is finally supported on a base plate 4. When the pressure caps are pressed, they produce electrical contacts on the underlying switching contact surface element 3, which trigger certain control commands.

In Figur 2 ist eine Gehäuseabdeckung 1 dargestellt, die für eine Ausrüstung mit einer erfindungsgemäßen Heizeinrichtung vorgesehen ist. Hierzu sind um jede Ausnehmung 7 für die Tasten Kanäle 5 eingearbeitet, in die Heizdrähte 6, insbesondere in Form einer Heizmatrix, eingepasst bzw. eingelegt werden können. Nach dem Einlegen bzw. Einpassen der von der Heizmatrix gebildeten Heizdrähte 6 in die Kanäle 5 der Gehäuseabdeckung 1 befindet sich somit die Heizeinrichtung direkt im Bereich der Tastenkappen und oberhalb des flächigen Dichtungselements 2.In FIG. 2 a housing cover 1 is shown, which is provided for an equipment with a heating device according to the invention. These are around each recess 7 incorporated for the keys channels 5, in the heating wires 6, in particular in the form of a heating matrix, can be fitted or inserted. After inserting or fitting the heating wires 6 formed by the heating matrix into the channels 5 of the housing cover 1, the heating device is thus located directly in the region of the keycaps and above the planar sealing element 2.

Beim Betrieb der Tastenschalteinrichtung kann bei Bedarf elektrischer Strom an die Heizvorrichtung angelegt werden, so dass der Bereich der Ausnehmungen 7 der Tasten in der Gehäuseabdeckung 1 direkt beheizt werden kann. Dadurch kann zuverlässig verhindert werden, dass Kondenswasser zwischen den Tasten und den Tastenausnehmungen festfriert und so die Tasten unbeweglich macht.When operating the key switching device, electric current can be applied to the heater, if necessary, so that the area of the recesses 7 of the keys in the housing cover 1 can be heated directly. This can reliably prevent condensation from freezing between the keys and the key recesses, thus rendering the keys immobile.

Claims (9)

Schalteinrichtung mit einer Gehäuseabdeckung, die Ausnehmungen für relativ zur Gehäuseabdeckung bewegliche Schaltelemente aufweist, einem unterhalb der Gehäuseabdeckung angeordneten, die Schaltelemente abstützenden oder tragenden, flächigen Dichtungselement und einem unterhalb des Dichtungselements angeordneten Schaltkontaktflächenelement, wobei durch Übertragung der Relativbewegung der Schaltelemente über das flächige Dichtungselement ein Kontakt auf dem Schaltkontaktflächenelement herstellbar ist, dadurch gekennzeichnet, dass auf dem flächigen Dichtungselement (2) oder oberhalb des flächigen Dichtungselements (2) eine Heizeinrichtung für die Schaltelemente vorgesehen ist.Switching device having a housing cover, the recesses for relative to the housing cover movable switching elements, arranged below the housing cover, the switching elements supporting or bearing, planar sealing element and a arranged below the sealing element switching contact surface element, wherein by transmitting the relative movement of the switching elements on the planar sealing element contact can be produced on the switch contact surface element, characterized in that on the flat sealing element (2) or above the flat sealing element (2) is provided a heating device for the switching elements. Schalteinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass auf der dem flächigen Dichtungselement (2) zugewandten Seite der Gehäuseabdeckung (1) Aufnahmen für die Heizeinrichtung vorgesehen sind.Switching device according to Claim 1, characterized in that receptacles for the heating device are provided on the side of the housing cover (1) facing the planar sealing element (2). Schalteinrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Aufnahmen als Kanäle (5) ausgebildet sind, die die Ausnehmungen (7) für die Schaltelemente umgeben.Switching device according to claim 2, characterized in that the receptacles are formed as channels (5) surrounding the recesses (7) for the switching elements. Schalteinrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Heizeinrichtung elektrische Heizdrähte (6) umfasst, die in die Kanäle (5) eingepasst sind.Switching device according to claim 3, characterized in that the heating device comprises electrical heating wires (6) which are fitted in the channels (5). Schalteinrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Heizdrähte (6) auf dem flächigen Dichtungselement (2) aufgebracht sind.Switching device according to claim 4, characterized in that the heating wires (6) are applied to the flat sealing element (2). Schalteinrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Heizeinrichtung direkt unter den Schaltelementen angeordnete Heizelemente aufweist.Switching device according to one of claims 1 to 5, characterized in that the heating device has heating elements arranged directly below the switching elements. Schalteinrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Schaltelemente als Tasten ausgebildet sind.Switching device according to one of claims 1 to 6, characterized in that the switching elements are designed as buttons. Schalteinrichtung nach Anspruch 7, dadurch gekennzeichnet, dass das flächige Dichtungselement (2) als Membran ausgebildet ist, in die die Tasten in Form von flexiblen Druckkappen integriert sind.Switching device according to claim 7, characterized in that the flat sealing element (2) is designed as a membrane, in which the keys are integrated in the form of flexible pressure caps. Schalteinrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass sie als Bedieneinrichtung eines Flurförderzeugs vorgesehen ist.Switching device according to one of claims 1 to 8, characterized in that it is provided as an operating device of a truck.
EP20090013820 2008-11-21 2009-11-03 Switching device Not-in-force EP2189997B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008058437 2008-11-21
DE102009020411A DE102009020411A1 (en) 2008-11-21 2009-05-08 switching device

Publications (2)

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EP2189997A1 true EP2189997A1 (en) 2010-05-26
EP2189997B1 EP2189997B1 (en) 2014-01-15

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ID=41692883

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EP20090013820 Not-in-force EP2189997B1 (en) 2008-11-21 2009-11-03 Switching device

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EP (1) EP2189997B1 (en)
DE (1) DE102009020411A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01221829A (en) * 1988-02-29 1989-09-05 Nippon Mektron Ltd Diaphragm type keyboard switch
EP0444914A2 (en) 1990-02-28 1991-09-04 Lucas Industries Public Limited Company Switch assembly
DE9200205U1 (en) 1992-01-10 1993-02-04 Dyna Systems GmbH, 8999 Scheidegg Input keyboard for special environmental conditions
EP0585536A1 (en) * 1992-09-02 1994-03-09 PROTO EL S.r.l. An anti-vandal hermetically sealed push-button panel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01221829A (en) * 1988-02-29 1989-09-05 Nippon Mektron Ltd Diaphragm type keyboard switch
EP0444914A2 (en) 1990-02-28 1991-09-04 Lucas Industries Public Limited Company Switch assembly
DE9200205U1 (en) 1992-01-10 1993-02-04 Dyna Systems GmbH, 8999 Scheidegg Input keyboard for special environmental conditions
EP0585536A1 (en) * 1992-09-02 1994-03-09 PROTO EL S.r.l. An anti-vandal hermetically sealed push-button panel

Also Published As

Publication number Publication date
EP2189997B1 (en) 2014-01-15
DE102009020411A1 (en) 2010-05-27

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