EP2189997A1 - Dispositif de commutation - Google Patents

Dispositif de commutation 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)
English (en)
Other versions
EP2189997B1 (fr
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/fr
Application granted granted Critical
Publication of EP2189997B1 publication Critical patent/EP2189997B1/fr
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)
EP20090013820 2008-11-21 2009-11-03 Dispositif de commutation Not-in-force EP2189997B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008058437 2008-11-21
DE102009020411A DE102009020411A1 (de) 2008-11-21 2009-05-08 Schalteinrichtung

Publications (2)

Publication Number Publication Date
EP2189997A1 true EP2189997A1 (fr) 2010-05-26
EP2189997B1 EP2189997B1 (fr) 2014-01-15

Family

ID=41692883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090013820 Not-in-force EP2189997B1 (fr) 2008-11-21 2009-11-03 Dispositif de commutation

Country Status (2)

Country Link
EP (1) EP2189997B1 (fr)
DE (1) DE102009020411A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01221829A (ja) * 1988-02-29 1989-09-05 Nippon Mektron Ltd 膜型キーボードスイッチ
EP0444914A2 (fr) 1990-02-28 1991-09-04 Lucas Industries Public Limited Company Agencement commutateur
DE9200205U1 (de) 1992-01-10 1993-02-04 Dyna Systems GmbH, 8999 Scheidegg Eingabetastatur für besondere Umweltbedingungen
EP0585536A1 (fr) * 1992-09-02 1994-03-09 PROTO EL S.r.l. Clavier à boutons-poussoirs antivandalisme étanche

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01221829A (ja) * 1988-02-29 1989-09-05 Nippon Mektron Ltd 膜型キーボードスイッチ
EP0444914A2 (fr) 1990-02-28 1991-09-04 Lucas Industries Public Limited Company Agencement commutateur
DE9200205U1 (de) 1992-01-10 1993-02-04 Dyna Systems GmbH, 8999 Scheidegg Eingabetastatur für besondere Umweltbedingungen
EP0585536A1 (fr) * 1992-09-02 1994-03-09 PROTO EL S.r.l. Clavier à boutons-poussoirs antivandalisme étanche

Also Published As

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

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