EP0669630A2 - Pushbutton assembly - Google Patents

Pushbutton assembly Download PDF

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Publication number
EP0669630A2
EP0669630A2 EP95101979A EP95101979A EP0669630A2 EP 0669630 A2 EP0669630 A2 EP 0669630A2 EP 95101979 A EP95101979 A EP 95101979A EP 95101979 A EP95101979 A EP 95101979A EP 0669630 A2 EP0669630 A2 EP 0669630A2
Authority
EP
European Patent Office
Prior art keywords
push button
arrangement according
lugs
switching
circuit board
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.)
Withdrawn
Application number
EP95101979A
Other languages
German (de)
French (fr)
Other versions
EP0669630A3 (en
Inventor
Reinhard Deeg
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.)
Alcatel Lucent Deutschland AG
Original Assignee
Alcatel SEL AG
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 Alcatel SEL AG filed Critical Alcatel SEL AG
Publication of EP0669630A2 publication Critical patent/EP0669630A2/en
Publication of EP0669630A3 publication Critical patent/EP0669630A3/en
Withdrawn legal-status Critical Current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
    • H01H2221/00—Actuators
    • H01H2221/008—Actuators other then push button
    • H01H2221/016—Lever; Rocker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/024—Packing between substrate and membrane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2233/00—Key modules
    • H01H2233/01—Key modules mounted on laykey
    • H01H2233/014—Snap coupling

Definitions

  • the invention relates to a push button arrangement according to the preamble of claim 1.
  • the button arrangement described there has a supporting frame as the lower housing part, on which a circuit board with the fixed contacts rests. There is a contact mat with domes, in which the movable contacts are attached. The circuit board and switch mat are held in place by a latched button guide that represents the upper part of the housing. In this upper part, the buttons are guided in corresponding openings, which each press when pressed on the corresponding dome and thereby close the respective contacts on the circuit board.
  • the invention has for its object to provide a push button assembly with a different, simple structure that can be harmoniously inserted into a communication terminal.
  • This object is achieved by the features specified in claim 1. Further training can be found in the subclaims.
  • the advantage of this construction is the arrangement of the keys in an increasing design, coordinated with the design of a communication device. The key arrangement is assembled by joining without additional fastening elements.
  • the pushbutton arrangement 1 shown in FIGS. 1 and 2 essentially consists of a printed circuit board 2, an elastic switching mat 3 and lever-like pushbuttons 4.
  • the printed circuit board 2 forms the basis on which the other parts are built. It contains, as usual, fixed contacts 6 and conductor tracks 5.
  • the switch mat 3 made of rubber or rubber-like material, which is equipped in a known manner with upwardly curved switching domes 7, in which contacts 8 are attached, each with corresponding fixed contacts 6 of the circuit board 2 act together when one of the switching domes is depressed.
  • each switching dome 7 has an integrally formed, upwardly directed pin or extension 9 which is in contact with a pushbutton 4.
  • the push buttons 4 and the switching domes 7 are used in the usual 3 x 4 arrangement. Between the and outside of the three columns in which the switching domes are seated are tubular projections 10 which project upwards and downwards from the switching mat. The downwardly projecting part of each lug 10 has a tapered thickening which forms a collar 11 which is buttoned through corresponding holes 12 in the printed circuit board 2. In this way, switch mat 3 and circuit board 2 are firmly connected.
  • the part of the lugs 10 protruding upwards serves in each case to receive guide pins 13 of the pushbuttons 4.
  • the upper parts of the lugs 10 are designed to rise in the same steps from row to row, since the pushbuttons which are the same and designed as relatively long-armed levers 4 partially overlap each other.
  • the lugs 10 are drawn in, so that the guide pins 13 of the pushbuttons 4, the ends of which each have a mushroom-shaped thickening 14, snap into place when inserted into the lugs and are therefore captive.
  • At the upper end of the lugs 10 is also the fulcrum of the respective push button 4.
  • the push buttons 4 have a U-shaped plan, the two free legs 15 forming the long lever mentioned. They are essentially flat rectangles, on each of which a guide pin 13 is formed on its underside. The two legs 15 of each push button 4 are connected by the cross leg, which represents the actuating part 16 of the push button. It rises above the level of the free legs 15 and has a flat, arched, U-shaped cross section, which is chosen from an ergonomic point of view.
  • each actuating part 16 is approximately in contact with one of the shoulders 9 of the switching mat 3 at the level of the free legs 15, so that when the actuating part 16 is depressed the corresponding switching dome 7 is also actuated and its contacts 8 close the contacts on the printed circuit board 2.
  • the lugs 9 on the switching domes 7, like the lugs 10, are graded from row to row increasing to the rear.
  • the pushbuttons 4 are reset by the corresponding switching dome 7.
  • the return stroke is limited by stops 17 which protrude from the switching mat 3 and are each arranged under the short lever arm of the legs 15 of the pushbuttons 4.
  • a circumferential rib 18 can be formed on the edges of the switch mat 3 as a stiffener.

Landscapes

  • Push-Button Switches (AREA)

Abstract

The push-button device has an elastic switch mat (3) with a number of switch domes (7) carrying respective contacts (8), cooperating with counter-contacts (6) of a circuit board (2), upon operation of the corresponding push-button keys (4). The switch mat has tubular projections (10) receiving guide pins (13) for respective push-button keys, simultaneously acting as bearing points for the relatively long lever arms of the push-button keys, which overlie one another. Pref. each guide pin has a thickened retaining edge (14), engaged by a retaining lip at the end of the respective projection.

Description

Die Erfindung betrifft eine Drucktastenanordnung nach dem Oberbegriff des Anspruchs 1.The invention relates to a push button arrangement according to the preamble of claim 1.

Eine derartige Anordnung ist aus der DE 31 42 880 A1 bekannt. Die dort beschriebene Tastenanordnung besitzt als Gehäuseunterteil einen Tragrahmen, auf dem eine Leiterplatte mit den festen Kontakten ruht. Darauf liegt eine Kontaktmatte mit Domen, in denen die beweglichen Kontakte angebracht sind. Leiterplatte und Schaltmatte werden durch eine aufgerastete Tastenführung fixiert, die das Oberteil des Gehäuses darstellt. In diesem Oberteil sind in entsprechenden Öffnungen die Tasten geführt, die bei Betätigung jeweils auf den entsprechenden Dom drücken und dabei die jeweiligen Kontakte auf der Leiterplatte schließen.Such an arrangement is known from DE 31 42 880 A1. The button arrangement described there has a supporting frame as the lower housing part, on which a circuit board with the fixed contacts rests. There is a contact mat with domes, in which the movable contacts are attached. The circuit board and switch mat are held in place by a latched button guide that represents the upper part of the housing. In this upper part, the buttons are guided in corresponding openings, which each press when pressed on the corresponding dome and thereby close the respective contacts on the circuit board.

Der Erfindung liegt die Aufgabe zugrunde, eine Drucktastenanordnung mit anderem, einfachem Aufbau zu schaffen, die sich in ein Kommunikations-Endgerät harmonisch einfügen läßt. Gelöst wird diese Aufgabe durch die im Anspruch 1 angegebenen Merkmale. Weiterbildungen sind den Unteransprüchen zu entnehmen. Der Vorteil dieser Konstruktion ist die Anordnung der Tasten in ansteigender Bauweise, abgestimmt auf eine Gestaltung eines Kommunikationsgerätes. Die Montage der Tastenanordnung erfolgt durch Fügen ohne zusätzliche Befestigungselemente.The invention has for its object to provide a push button assembly with a different, simple structure that can be harmoniously inserted into a communication terminal. This object is achieved by the features specified in claim 1. Further training can be found in the subclaims. The advantage of this construction is the arrangement of the keys in an increasing design, coordinated with the design of a communication device. The key arrangement is assembled by joining without additional fastening elements.

Die Erfindung wird an einem Ausführungsbeispiel beschrieben, das in den zugehörigen Zeichnungen dargestellt ist. Darin zeigen:

  • Fig. 1 eine Drucktastenanordnung gemäß der Erfindung in perspektivischer Ansicht, und
  • Fig. 2 einen Querschnitt durch die Drucktastenanordnung entsprechend der Linie 11-11 in Fig. 1.
The invention is described using an exemplary embodiment which is illustrated in the accompanying drawings. In it show:
  • Fig. 1 shows a push button arrangement according to the invention in perspective view, and
  • FIG. 2 shows a cross section through the push button arrangement along the line 11-11 in FIG. 1.

Die in den Fig. 1 und 2 gezeigte Drucktastenanordnung 1 besteht im wesentlichen aus einer Leiterplatte 2, einer elastischen Schaltmatte 3 und hebelartigen Drucktasten 4. Die Leiterplatte 2 bildet die Basis, auf der die anderen Teile aufgebaut sind. Sie enthält, wie üblich, feste Kontakte 6 und Leiterbahnen 5. Auf der Leiterplatte 2 liegt die Schaltmatte 3 aus Gummi oder gummiartigem Werkstoff, die in bekannter Weise mit nach oben gewölbten Schaltdomen 7 ausgerüstet ist, in denen Kontakte 8 angebracht sind, die jeweils mit entsprechenden festen Kontakten 6 der Leiterplatte 2 zusammen wirken, wenn einer der Schaltdome niedergedrückt wird. Jeder Schaltdom 7 hat am höchsten Punkt einen angeformten, aufwärts gerichteten Zapfen oder Ansatz 9, der mit einer Drucktaste 4 in Berührung steht.The pushbutton arrangement 1 shown in FIGS. 1 and 2 essentially consists of a printed circuit board 2, an elastic switching mat 3 and lever-like pushbuttons 4. The printed circuit board 2 forms the basis on which the other parts are built. It contains, as usual, fixed contacts 6 and conductor tracks 5. On the circuit board 2 is the switch mat 3 made of rubber or rubber-like material, which is equipped in a known manner with upwardly curved switching domes 7, in which contacts 8 are attached, each with corresponding fixed contacts 6 of the circuit board 2 act together when one of the switching domes is depressed. At the highest point, each switching dome 7 has an integrally formed, upwardly directed pin or extension 9 which is in contact with a pushbutton 4.

Die Drucktasten 4 und die Schaltdome 7 sind in der üblichen 3 x 4 Anordnung eingesetzt. Zwischen den und außerhalb der drei Spalten, in denen die Schaltdome sitzen, sind rohrförmige Ansätze 10 angebracht, die nach oben und nach unten aus der Schaltmatte hervorstehen. Der nach unten vorstehende Teil jedes Ansatzes 10 besitzt eine konisch zulaufende Verdickung, die einen Kragen 11 bildet, der durch entsprechende Löcher 12 in der Leiterplatte 2 geknöpft ist. Auf diese Weise werden Schaltmatte 3 und Leiterplatte 2 fest miteinander verbunden.The push buttons 4 and the switching domes 7 are used in the usual 3 x 4 arrangement. Between the and outside of the three columns in which the switching domes are seated are tubular projections 10 which project upwards and downwards from the switching mat. The downwardly projecting part of each lug 10 has a tapered thickening which forms a collar 11 which is buttoned through corresponding holes 12 in the printed circuit board 2. In this way, switch mat 3 and circuit board 2 are firmly connected.

Der nach oben vorstehende Teil der Ansätze 10 dient jeweils zur Aufnahme von Führungszapfen 13 der Drucktasten 4. Die oberen Teile der Ansätze 10 sind von Reihe zu Reihe nach hinten in gleichen Stufen ansteigend ausgeführt, da die unter sich gleichen, als relativ langarmige Hebel ausgestalteten Drucktasten 4 einander teilweise überdecken. Am oberen, freien Ende sind die Ansätze 10 eingezogen, so daß die Führungszapfen 13 der Drucktasten 4, deren Enden jeweils eine pilzförmige Verdickung 14 haben, beim Einsetzen in die Ansätze einrasten und damit unverlierbar sind. Am oberen Ende der Ansätze 10 liegt zugleich der Drehpunkt der jeweiligen Drucktaste 4.The part of the lugs 10 protruding upwards serves in each case to receive guide pins 13 of the pushbuttons 4. The upper parts of the lugs 10 are designed to rise in the same steps from row to row, since the pushbuttons which are the same and designed as relatively long-armed levers 4 partially overlap each other. At the upper, free end, the lugs 10 are drawn in, so that the guide pins 13 of the pushbuttons 4, the ends of which each have a mushroom-shaped thickening 14, snap into place when inserted into the lugs and are therefore captive. At the upper end of the lugs 10 is also the fulcrum of the respective push button 4.

Die Drucktasten 4 haben einen U-förmigen Grundriß, wobei die beiden freien Schenkel 15 den erwähnten, langen Hebel bilden. Sie sind im wesentlichen flache Rechtecke, an denen auf ihrer Unterseite je ein Führungszapfen 13 angeformt ist. Verbunden sind die beiden Schenkel 15 jeder Drucktaste 4 durch den Querschenkel, der den Betätigungsteil 16 der Drucktaste darstellt. Er erhebt sich über die Ebene der freien Schenkel 15 und hat einen flach gewölbten, U-förmigen Querschnitt, der nach ergonomischen Gesichtspunkten gewählt ist.The push buttons 4 have a U-shaped plan, the two free legs 15 forming the long lever mentioned. They are essentially flat rectangles, on each of which a guide pin 13 is formed on its underside. The two legs 15 of each push button 4 are connected by the cross leg, which represents the actuating part 16 of the push button. It rises above the level of the free legs 15 and has a flat, arched, U-shaped cross section, which is chosen from an ergonomic point of view.

Die Unterseite jedes Betätigungsteiles 16 steht etwa in Höhe der freien Schenkel 15 mit einem der Ansätze 9 der Schaltmatte 3 in Berührung, so daß beim Niederdrücken des Betätigungsteiles 16 auch der entsprechende Schaltdom 7 betätigt und seine Kontakte 8 die Kontakte auf der Leiterplatte 2 schließen. Die Ansätze 9 an den Schaltdomen 7 sind, wie die Ansätze 10, von Reihe zu Reihe nach hinten ansteigend abgestuft.The underside of each actuating part 16 is approximately in contact with one of the shoulders 9 of the switching mat 3 at the level of the free legs 15, so that when the actuating part 16 is depressed the corresponding switching dome 7 is also actuated and its contacts 8 close the contacts on the printed circuit board 2. The lugs 9 on the switching domes 7, like the lugs 10, are graded from row to row increasing to the rear.

Die Rückstellung der Drucktasten 4 erfolgt jeweils durch den entsprechenden Schaltdom 7. Begrenzt wird der Rückhub durch Anschläge 17, die von der Schaltmatte 3 aufragen und jeweils unter dem kurzen Hebelarm der Schenkel 15 der Drucktasten 4 angeordnet sind.The pushbuttons 4 are reset by the corresponding switching dome 7. The return stroke is limited by stops 17 which protrude from the switching mat 3 and are each arranged under the short lever arm of the legs 15 of the pushbuttons 4.

Eine umlaufende Rippe 18 kann an den Kanten der Schaltmatte 3 als Versteifung angeformt sein.A circumferential rib 18 can be formed on the edges of the switch mat 3 as a stiffener.

Claims (7)

1. Drucktastenanordnung mit einer elastischen Schaltmatte, die mit Kontakte enthaltenden Schaltdomen ausgerüstet ist, mit einer die Gegenkontakte tragenden Leiterplatte und mit auf die Schaltdome wirkenden, in Reihen und Spalten angeordneten Drucktasten,
dadurch gekennzeichnet, daß die Schaltmatte (3) rohrförmige Ansätze (10) aufweist, in deren Ende jeweils ein an jeder Drucktaste (4) angeformter Führungszapfen (13) eingerastet ist, der zugleich die Lagerstelle für die als relativ langarmige Hebel ausgebildeten Drucktasten (4) bildet, die einander teilweise überdeckend gestaffelt angebracht sind.1. Push button arrangement with an elastic switch mat, which is equipped with contacts containing switching domes, with a printed circuit board carrying the counter-contacts and with acting on the switching domes, in rows and Column-arranged pushbuttons,
characterized in that the switching mat (3) has tubular projections (10), in the end of which a guide pin (13) formed on each pushbutton (4) is engaged, which at the same time is the bearing point for the pushbuttons (4) designed as relatively long-armed levers forms, which are staggered partially overlapping each other. 2. Drucktastenanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Führungszapfen (13) am freien Ende eine abgesetzte Verdickung (14) und die oberen Enden der rohrförmigen Ansätze (10) eine Lochverengung aufweisen, hinter der die Verdickung (14) einrastet.2. Push button arrangement according to claim 1, characterized in that the guide pins (13) have a stepped thickening (14) at the free end and the upper ends of the tubular projections (10) have a hole narrowing, behind which the thickening (14) engages. 3. Drucktastenanordnung nach Anspruch 2, dadurch gekennzeichnet, daß die Ansätze (10) zwischen den Schaltdomen (7) angeordnet sind und daß die Drucktasten (4) U-förmigen Grundriß haben, wobei die freien Schenkel (15) den Hebel, an dessen Unterseite jeweils ein Führungszapfen (13) angeformt ist, und der Querschenkel das Betätigungsteil (16) bilden.3. Push button arrangement according to claim 2, characterized in that the approaches (10) between the switching domes (7) are arranged and that the push buttons (4) have a U-shaped plan, the free legs (15) the lever, on the underside thereof in each case a guide pin (13) is formed, and the cross leg form the actuating part (16). 4. Drucktastenanordnung nach Anspruch 3, dadurch gekennzeichnet, daß die freien Schenkel (15) der Drucktasten (4) zweiarmige Hebel sind, die jeweils jenseits des Führungszapfens (13) am freien Ende einen kurzen Hebelarm haben, der gegen einen an der Schaltmatte (3) angeformten Anschlag (17) schlägt, der den Rückhub begrenzt.4. Pushbutton arrangement according to claim 3, characterized in that the free legs (15) of the pushbuttons (4) are two-armed levers, each of which has a short lever arm on the free end beyond the guide pin (13), which acts against one of the switch mat (3 ) molded stop (17) that limits the return stroke. 5. Drucktastenanordnung nach Anspruch 4, dadurch gekennzeichnet, daß jeder Schaltdom (7) einen angeformten Ansatz (9) hat, auf dem das Betätigungsteil (16) einer Drucktaste (4) liegt, und daß diese Ansätze (9) von Reihe zu Reihe nach hinten im gleichen Maße ansteigend abgestuft sind, wie die Ansätze (10) zur Aufnahme der Führungszapfen.5. Push button arrangement according to claim 4, characterized in that each switching dome (7) has an integrally formed lug (9) on which the actuating part (16) of a push button (4) lies, and that these lugs (9) from row to row rear are graded to the same extent as the lugs (10) for receiving the guide pins. 6. Drucktastenanordnung nach Anspruch 3, dadurch gekennzeichnet, daß die rohrförmigen Ansätze (10) auf beiden Seiten aus der Schaltmatte (3) hervorstehen und daß die unteren Enden der Ansätze in entsprechende Löcher (12) der Leiterplatte (2) ragen.6. Push button arrangement according to claim 3, characterized in that the tubular lugs (10) protrude on both sides from the switch mat (3) and that the lower ends of the lugs protrude into corresponding holes (12) in the circuit board (2). 7. Drucktastenanordnung nach Anspruch 6, dadurch gekennzeichnet, daß die unteren Enden der Ansätze (10) der Schaltmatte (3) jeweils einen Kragen (11) haben, mit dem sie in die Löcher (12) der Leiterplatte (2) eingeknöpft sind.7. Push button arrangement according to claim 6, characterized in that the lower ends of the lugs (10) of the switch mat (3) each have a collar (11) with which they are buttoned into the holes (12) of the circuit board (2).
EP95101979A 1994-02-23 1995-02-14 Pushbutton assembly. Withdrawn EP0669630A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944405754 DE4405754A1 (en) 1994-02-23 1994-02-23 Pushbutton arrangement
DE4405754 1994-02-23

Publications (2)

Publication Number Publication Date
EP0669630A2 true EP0669630A2 (en) 1995-08-30
EP0669630A3 EP0669630A3 (en) 1997-10-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95101979A Withdrawn EP0669630A3 (en) 1994-02-23 1995-02-14 Pushbutton assembly.

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EP (1) EP0669630A3 (en)
DE (1) DE4405754A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1156643A2 (en) * 2000-05-16 2001-11-21 SAMSUNG ELECTRONICS Co. Ltd. Step keys, step key assembly, and terminal having the step key assembly
WO2006070336A1 (en) * 2004-12-31 2006-07-06 Beko Elektronik A.S. A transmission element

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506509C2 (en) * 1995-02-24 1996-12-05 Preh Elektro Feinmechanik Keypad for sales and cash registers
DE19634051C1 (en) * 1996-08-23 1997-08-28 Telefunken Microelectron Pushbutton switch arrangement mounted on a circuit board
KR100337786B1 (en) * 2000-08-19 2002-05-24 윤종용 Wide keypad and wide keypad mounting structure for preventing esd

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GB2084801A (en) * 1980-09-30 1982-04-15 Standard Telephones Cables Ltd Keypad button
GB2118778A (en) * 1982-04-13 1983-11-02 Standard Telephones Cables Ltd Keypad button
CA1188389A (en) * 1982-06-28 1985-06-04 Northern Telecom Limited Pushbutton switch assembly
US4582967A (en) * 1984-10-22 1986-04-15 Tec, Inc. Key switch assembly

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GB2086804B (en) * 1980-11-04 1984-08-22 Standard Telephones Cables Ltd Keyblock assembly
DE3343321A1 (en) * 1983-11-30 1985-06-05 Standard Elektrik Lorenz Ag, 7000 Stuttgart Dial keypad for telephone sets
SU1712979A1 (en) * 1988-01-28 1992-02-15 Минский научно-исследовательский приборостроительный институт Keyboard
IT1232530B (en) * 1989-06-29 1992-02-19 Olivetti & Co Spa CONTACT KEYBOARD
US5115106A (en) * 1990-04-20 1992-05-19 Honeywell Inc. Momentary "on" switch suitable for keyboards
DE4140973A1 (en) * 1991-12-12 1993-06-17 Sel Alcatel Ag KEYPAD

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
GB2084801A (en) * 1980-09-30 1982-04-15 Standard Telephones Cables Ltd Keypad button
GB2118778A (en) * 1982-04-13 1983-11-02 Standard Telephones Cables Ltd Keypad button
CA1188389A (en) * 1982-06-28 1985-06-04 Northern Telecom Limited Pushbutton switch assembly
US4582967A (en) * 1984-10-22 1986-04-15 Tec, Inc. Key switch assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1156643A2 (en) * 2000-05-16 2001-11-21 SAMSUNG ELECTRONICS Co. Ltd. Step keys, step key assembly, and terminal having the step key assembly
EP1156643A3 (en) * 2000-05-16 2004-04-14 SAMSUNG ELECTRONICS Co. Ltd. Step keys, step key assembly, and terminal having the step key assembly
WO2006070336A1 (en) * 2004-12-31 2006-07-06 Beko Elektronik A.S. A transmission element

Also Published As

Publication number Publication date
EP0669630A3 (en) 1997-10-08
DE4405754A1 (en) 1995-08-24

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