EP0810619A1 - Interrupteur à bouton poussoir pour appareils ménagers - Google Patents

Interrupteur à bouton poussoir pour appareils ménagers Download PDF

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Publication number
EP0810619A1
EP0810619A1 EP96108473A EP96108473A EP0810619A1 EP 0810619 A1 EP0810619 A1 EP 0810619A1 EP 96108473 A EP96108473 A EP 96108473A EP 96108473 A EP96108473 A EP 96108473A EP 0810619 A1 EP0810619 A1 EP 0810619A1
Authority
EP
European Patent Office
Prior art keywords
circuit board
switch according
contact surfaces
switching
film
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
EP96108473A
Other languages
German (de)
English (en)
Other versions
EP0810619B1 (fr
Inventor
Klaus Imer
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.)
Haschkamp Wolfgang Dipl-Kfm
Original Assignee
Haschkamp Joachim Dipl-Ing
Haschkamp Wolfgang Dipl-Kfm
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 Haschkamp Joachim Dipl-Ing, Haschkamp Wolfgang Dipl-Kfm filed Critical Haschkamp Joachim Dipl-Ing
Priority to DE59605881T priority Critical patent/DE59605881D1/de
Priority to DE29609439U priority patent/DE29609439U1/de
Priority to AT96108473T priority patent/ATE196384T1/de
Priority to EP96108473A priority patent/EP0810619B1/fr
Priority to DK96108473T priority patent/DK0810619T3/da
Publication of EP0810619A1 publication Critical patent/EP0810619A1/fr
Application granted granted Critical
Publication of EP0810619B1 publication Critical patent/EP0810619B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H13/702—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 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705—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 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • 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
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/20—Driving mechanisms
    • 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
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H01H13/56—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state upon the next application of operating force
    • H01H13/562—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state upon the next application of operating force making use of a heart shaped cam
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/01—Protective enclosure
    • H01H2201/012—Inert gas in contact space
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2213/00—Venting
    • H01H2213/01—Venting with internal pressure of other switch sites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2213/00—Venting
    • H01H2213/01—Venting with internal pressure of other switch sites
    • H01H2213/014—Accumulator chamber
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/046—Actuators bistable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/08—Actuators composed of different parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2231/00—Applications
    • H01H2231/012—Household appliance

Definitions

  • the invention relates to a push button switch for household appliances, in particular for washing machines and tumble dryers.
  • Pushbutton switches of this type are generally used as package switches with a plurality of key slides lying next to one another as program selection switches.
  • the programs are not switched directly via the power switch, but electronics are provided which partially switch the desired programs using a microprocessor.
  • These program switches switch low voltages between 5 volts and 12 volts and currents that are in the microampere range or in the milliamper range. Since the low voltages and the low currents flowing through the switch contacts can even slightly contaminate or oxidize the contact, special precautions must be taken to ensure reliable contact without significant contact resistance even after prolonged operation. As a rule, gold contacts are used to prevent oxidation for the program switches, but they can fail even with the slightest contamination, which causes malfunctions in the program sequence.
  • a box element for contactless switching in which an essentially inwardly acting radiation source is arranged on a side wall of a button body and a detector element which is matched to the radiation source is arranged on an opposite side of the button body, between which Radiation source and the detector is arranged for the relevant radiation not or only slightly permeable up and down movable stem.
  • WO 89/09515 shows a push-button switch in which a light-conducting connection is established between a light-emitting diode and a receiver by pressing a button, whereby a switch-on process can be initiated without contact.
  • EP-A-0 570 870 describes a rotary selector switch with an electrically contacted light-transmitting / receiving device, the actuating device being designed as a coding element which engages in the beam path of the device and in the housing or on the actuating device the light path between the light-transmitting and receiving devices.
  • Device influencing light reflection or light guide element is arranged.
  • Such optical switching devices work contactlessly and reliably over the long term provided that the light transmitter and light receiver and the light guide in between are adequately protected against contamination. However, they are not as sensitive to contamination as the galvanic switch contacts; however, they require a not inconsiderable additional circuitry.
  • Switching foils whose galvanic contacts are protected by edge sealing, are also used as program switches. However, these switching foils are always designed as keypads, so that the switching position cannot be recognized on the switching foil and an additional signal display was always required to indicate which program was selected.
  • the invention is therefore based on the object of designing a generic pushbutton switch in such a way that it can be produced inexpensively and ensures reliable and permanent contacting.
  • the invention is accordingly based on the knowledge that a switching film known per se can also be provided for permanent contact (during the respective program sequence) if various conditions are met. Contamination of the contacts is prevented with certainty by gluing the switching foil, because the contacts are protected against air ingress. It is even possible to fill the sealed space with an inert protective gas.
  • a spacer film is arranged between the contact film and the printed circuit board, which ensures that the contact surfaces of the contact film are returned when the button is pressed.
  • circuit board Since the circuit board is glued to the spacer film and the contact film, the contact surfaces are protected against corrosion and dirt, and the function of the switch is guaranteed even with the smallest currents.
  • the spacer film is punched out at the points where the contacts are located.
  • the individual punched-out contact fields are connected to one another by slots, which cause the air or the protective gas to escape between the contact surfaces. This is important because without these compensation slots a much greater force would be required to apply the contact foil to the contact surfaces of the printed circuit boards to press. In addition, the resilience of the contact film is improved.
  • the invention is particularly suitable for push button switch packages in which at least some of the push buttons are used for program switching purposes, but one button can also be designed as a power switch and another button can be used to mechanically lock or unlock a door.
  • the push button switch according to the invention can, however, also be used in a versatile manner as a single push button where small and very small currents can be switched safely and an optical display can be recognized by the position of the button head.
  • Each program key 10 has a slide 16 mounted in the housing 12, which slides via a locking mechanism (not shown in the drawing), for example in the form of a heartbeat in two positions, namely the off position according to FIG. 3 and the on position according to FIG. 4 , is displaceable and fixable in the two positions.
  • the slide At its lower end, the slide has a plunger 18 which is axially movable in a recess in the key slide and is cushioned by a compression coil spring 20. The plunger 18 is provided with barbs 22 and snapped into the recess of the slide 16.
  • This spring-loaded plunger 18 acts on the circuit board 26 via the switching film 24.
  • the compensating spring 20 ensures that the return stroke of the actuating button 10 caused by the latching mechanism is absorbed and the switching plunger is continuously contacted in the on position according to FIG. 4.
  • the contact surfaces 28 and the conductor tracks 30 are produced on the printed circuit board in the usual way by etching.
  • the contact surfaces and the conductor tracks can also be printed with a carbon varnish.
  • the contact surfaces 28 intermesh like a comb, and they are bridged by the individual contact surfaces of the switching film 24 in the pressed state.
  • the contact surfaces 32 of the switching film 24 are applied by conductive silver paint or carbon printing.
  • a spacer film 34 is joined between the circuit board 26 and the switching film 24. This spacer film is in those places where the contacts are provided with punched holes 36 which are slightly larger in diameter than the contact surfaces 32 of the switching film and the contact surfaces 28 of the printed circuit board.
  • the individual punched holes 36 are connected to one another by slots 38 in the spacer film.
  • the switching film 24 is glued to the entire area of the contact film (with the exception of the holes 36 and slots 38) in the manner shown in FIG. 8.
  • the spacer film 34 with the switching film 24 carried by it is glued onto the circuit board 26 in such a way that the contact surfaces 32 of the switching film 24 come to lie at a distance above the switching contact surfaces 28 of the circuit board.
  • These three layers 24, 26, 34 form a self-contained, outwardly sealed laminate with a free space which is determined by the punched holes 36 and the slots 38. This space is filled with air or an inert gas.
  • the slots 38 cause the gas in the slots 38 to escape between the contact surfaces.
  • the spring-loaded plunger 18 in the slide 16 presses on the contact surface 32 covered by the film 24 and presses it down until it strikes the comb-like intermeshing contact surfaces 28 of the printed circuit board 26 and bridges it.
  • the spacer film 24 causes the contact surfaces 28 on the circuit board 26 and the contact surfaces 32 of the contact film to be kept apart in the switched-off position.
  • circuit board Since the circuit board is glued to the spacer film and the contact film, the contact surfaces are protected against corrosion and dirt, and the function of the switch is guaranteed even with the smallest currents.

Landscapes

  • Push-Button Switches (AREA)
  • Keying Circuit Devices (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
EP96108473A 1996-05-28 1996-05-28 Interrupteur à bouton poussoir pour appareils ménagers Expired - Lifetime EP0810619B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE59605881T DE59605881D1 (de) 1996-05-28 1996-05-28 Drucktastenschalter für Haushaltsgeräte
DE29609439U DE29609439U1 (de) 1996-05-28 1996-05-28 Drucktastenschalter für Haushaltsgeräte
AT96108473T ATE196384T1 (de) 1996-05-28 1996-05-28 Drucktastenschalter für haushaltsgeräte
EP96108473A EP0810619B1 (fr) 1996-05-28 1996-05-28 Interrupteur à bouton poussoir pour appareils ménagers
DK96108473T DK0810619T3 (da) 1996-05-28 1996-05-28 Tryktastafbryderpakke til husholdningsapparater

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29609439U DE29609439U1 (de) 1996-05-28 1996-05-28 Drucktastenschalter für Haushaltsgeräte
EP96108473A EP0810619B1 (fr) 1996-05-28 1996-05-28 Interrupteur à bouton poussoir pour appareils ménagers

Publications (2)

Publication Number Publication Date
EP0810619A1 true EP0810619A1 (fr) 1997-12-03
EP0810619B1 EP0810619B1 (fr) 2000-09-13

Family

ID=26059017

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96108473A Expired - Lifetime EP0810619B1 (fr) 1996-05-28 1996-05-28 Interrupteur à bouton poussoir pour appareils ménagers

Country Status (4)

Country Link
EP (1) EP0810619B1 (fr)
AT (1) ATE196384T1 (fr)
DE (2) DE59605881D1 (fr)
DK (1) DK0810619T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19839811A1 (de) * 1998-09-01 2000-03-02 Delphi Automotive Systems Gmbh Schalteranordnung
US8404990B2 (en) 2010-06-30 2013-03-26 3M Innovative Properties Company Switch system having a button travel limit feature

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2169812A1 (fr) * 1971-12-13 1973-09-14 Datanetics Corp
US4362954A (en) * 1981-09-25 1982-12-07 The Maytag Company Power-up control for microprocessor based appliance
US4376239A (en) * 1980-10-03 1983-03-08 Allen-Bradley Company Industrial membrane switch
US4417115A (en) * 1982-03-03 1983-11-22 Amp Incorporated Switch actuating assembly having improved cams and plural modes
DE3407380A1 (de) * 1983-03-03 1984-09-06 General Electric Co., Schenectady, N.Y. Steueranzeigeanordnung fuer einen herd mit einem membranschalter
US4484038A (en) * 1982-12-01 1984-11-20 Dorman-Bogdonoff Corp. Membrane touch panel having improved conductor construction
US4559426A (en) * 1980-11-03 1985-12-17 Oak Industries Inc. Membrane switch and components having means for preventing creep
GB2183401A (en) * 1985-11-22 1987-06-03 Morse Nena Switch assembly
DE8712230U1 (de) * 1987-09-09 1987-11-19 Siemens AG, 1000 Berlin und 8000 München Schalter für eine Fernsprechstation
WO1987007759A1 (fr) * 1986-06-02 1987-12-17 Bebié + Co. Clavier pour utilisation dans des conditions difficiles

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2169812A1 (fr) * 1971-12-13 1973-09-14 Datanetics Corp
US4376239A (en) * 1980-10-03 1983-03-08 Allen-Bradley Company Industrial membrane switch
US4559426A (en) * 1980-11-03 1985-12-17 Oak Industries Inc. Membrane switch and components having means for preventing creep
US4362954A (en) * 1981-09-25 1982-12-07 The Maytag Company Power-up control for microprocessor based appliance
US4417115A (en) * 1982-03-03 1983-11-22 Amp Incorporated Switch actuating assembly having improved cams and plural modes
US4484038A (en) * 1982-12-01 1984-11-20 Dorman-Bogdonoff Corp. Membrane touch panel having improved conductor construction
DE3407380A1 (de) * 1983-03-03 1984-09-06 General Electric Co., Schenectady, N.Y. Steueranzeigeanordnung fuer einen herd mit einem membranschalter
GB2183401A (en) * 1985-11-22 1987-06-03 Morse Nena Switch assembly
WO1987007759A1 (fr) * 1986-06-02 1987-12-17 Bebié + Co. Clavier pour utilisation dans des conditions difficiles
DE8712230U1 (de) * 1987-09-09 1987-11-19 Siemens AG, 1000 Berlin und 8000 München Schalter für eine Fernsprechstation

Also Published As

Publication number Publication date
DK0810619T3 (da) 2000-11-13
DE59605881D1 (de) 2000-10-19
ATE196384T1 (de) 2000-09-15
DE29609439U1 (de) 1996-08-14
EP0810619B1 (fr) 2000-09-13

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