EP0064615B1 - Telephone equipment with selection keyboard - Google Patents

Telephone equipment with selection keyboard Download PDF

Info

Publication number
EP0064615B1
EP0064615B1 EP82103240A EP82103240A EP0064615B1 EP 0064615 B1 EP0064615 B1 EP 0064615B1 EP 82103240 A EP82103240 A EP 82103240A EP 82103240 A EP82103240 A EP 82103240A EP 0064615 B1 EP0064615 B1 EP 0064615B1
Authority
EP
European Patent Office
Prior art keywords
cover
guide plate
telephone set
keytops
guided
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.)
Expired
Application number
EP82103240A
Other languages
German (de)
French (fr)
Other versions
EP0064615A2 (en
EP0064615A3 (en
Inventor
Hugo Ruzic
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 NV
Original Assignee
Alcatel SEL AG
Standard Elektrik Lorenz AG
International Standard Electric Corp
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, Standard Elektrik Lorenz AG, International Standard Electric Corp filed Critical Alcatel SEL AG
Priority to AT82103240T priority Critical patent/ATE16539T1/en
Publication of EP0064615A2 publication Critical patent/EP0064615A2/en
Publication of EP0064615A3 publication Critical patent/EP0064615A3/en
Application granted granted Critical
Publication of EP0064615B1 publication Critical patent/EP0064615B1/en
Expired 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
    • 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
    • H01H2221/00—Actuators
    • H01H2221/024—Transmission element
    • H01H2221/026—Guiding or lubricating nylon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/05—Force concentrator; Actuating dimple
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2221/00—Actuators
    • H01H2221/062—Damping vibrations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2223/00—Casings
    • H01H2223/002—Casings sealed
    • H01H2223/004—Evacuation of penetrating liquid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2223/00—Casings
    • H01H2223/008—Casings metallic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2223/00—Casings
    • H01H2223/034—Bezel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2231/00—Applications
    • H01H2231/022—Telephone handset
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/038—Anti-vandalism

Definitions

  • the invention relates to a telephone set with a dial key set according to the preamble of claim 1.
  • a push button switch with many contacts is known, as it is used among other things in telephone sets.
  • push buttons with a hat-shaped cross section are guided in the cover plate, the collar of the push button limiting its upward stroke by abutting the shoulder of the narrower hole in the cover plate a helical compression spring, which serves the provision.
  • the spring is connected to a plunger, which acts on the contact.
  • the latter is formed by a convexly curved disk or plate which snaps around when a button is pressed and comes into contact with the contacts or conductor tracks of a circuit board underneath.
  • the object of the present invention is to provide a telephone set with a key set which is particularly protected against vandalism. This object is achieved by the characterizing features of claim 1.
  • the dial key set of a telephone device in particular a payphone, is almost insensitive to the effects of blows, fire and liquids.
  • the solution can be used for all types of key sets, i. H. for key sets with foil contacts and for key sets with contact springs.
  • a version is specified in which commercially available key sets can remain unchanged and are nevertheless protected against damage of the type mentioned above.
  • a metal guide plate 1 which is provided with tubular, upwardly directed projections 6 at the locations of the keys, is placed directly on contact foils 13. Their number and stratification depends on the application. At the points where the plunger 5 guided in the bores 17 of the lugs 6 act on the contact foils 13, the conductor tracks 7 of different foil layers face each other openly so that they come into contact when the respective key is depressed.
  • the plungers 5 are mushroom-shaped, with the curved roof 14 directed downwards against the contact foils 13 and the shaft 15 upwards.
  • One end of a helical compression spring 4 is plugged onto the latter, the other end of which is supported against the respective push button 3.
  • the push buttons 3 have a hat-shaped cross section.
  • the walls of the cavity 16 serve as a guide on the tubular extension 6 of the guide plate 1.
  • the cavity 16 forms the receptacle for the upper end of the helical compression spring4, which causes the key to be reset.
  • the outer walls of the push buttons 3 are guided in corresponding openings 18 in a cover 2 which is placed on the guide plate 1.
  • the cover has pulled-down side walls 19 and stiffening ribs 20 between the keys, all of which end in the same plane and form the contact surfaces with the guide plate 1.
  • Their height also determines the stroke of the buttons because their push buttons 3 have a collar 21 at the open end, which strikes the cover 2 on the one hand and the guide plate 1 on the other hand.
  • Cover 2 and push buttons 3 are made of metal, preferably of an aluminum die-cast alloy. This makes the button set insensitive to blows and fire. It is also protected against liquids, since only small amounts can penetrate the push buttons, which then remain in the space between cover 2 and guide plate 1.
  • openings 8 are made, for example, at the butt joint between the cover and the guide plate. Since the key set is installed in oblique to vertical surfaces, it is sufficient if the openings 8 are provided on the underside.
  • the contact foils 13 of the embodiment according to FIG. 1 are omitted.
  • the helical compression springs 4 are omitted because the keys 11 of the commercially available keypad dialing block 12 already have such feathers.
  • the plunger 10 are made so long that they bridge the distance from the underside of the guide plate 1 to the inside of the push button 3. Between this and the upper end of the plunger 10, an elastic member 9 made of rubber or the like is inserted as a buffer.

Landscapes

  • Push-Button Switches (AREA)
  • Telephone Set Structure (AREA)
  • Telephone Function (AREA)
  • Switches With Compound Operations (AREA)

Abstract

1. Telephone set with a pushbutton dialling keypad whose keytops (3) have hat-shaped cross sections, are guided in a cover (2) and are each, with the aid of a flexible member (4; 9), connected to a plunger (5; 10) serving to actuate the contacts (7; 11), characterized in that said cover (2) is placed on to a guide plate (1) having upright tubular extensions (6) which are overlapped by said keytops (3) and in which said plungers (5; 10) are guided, and that said guide plate (1), said cover (2) and said keytops (3) are all made of metal.

Description

Die Erfindung betrifft ein Fernsprechgerät mit Wähltastensatz nach dem Oberbegriff des Anspruchs 1.The invention relates to a telephone set with a dial key set according to the preamble of claim 1.

Aus der DE-A-2614119 ist ein Druckknopfschalter mit vielen Kontakten bekannt, wie er unter anderem bei Fernsprechgeräten zum Einsatz kommt. Bei einer Ausführung dieses Tastensatzes sind Druckknöpfe mit hutförmigem Querschnitt in der Deckplatte geführt, wobei der Bund des Druckknopfes seinen Hub nach oben begrenzt, indem er an der Schulter der oben engeren Bohrung in der Deckplatte anstößt.-Innen ist der Druckknopf hohl, die Ausnehmung nimmt eine Schraubendruckfeder auf, die der Rückstellung dient. An ihrem freien Ende ist die Feder mit einem Stößel verbunden, der auf den Kontakt wirkt. Letzterer wird von einer konvex gewölbten Scheibe oder Platte gebildet, die bei Tastendruck schnappend umspringt und mit den darunter befindlichen Kontakten oder Leiterbahnen einer Schaltungsplatte in Berührung kommt.From DE-A-2614119 a push button switch with many contacts is known, as it is used among other things in telephone sets. In one version of this key set, push buttons with a hat-shaped cross section are guided in the cover plate, the collar of the push button limiting its upward stroke by abutting the shoulder of the narrower hole in the cover plate a helical compression spring, which serves the provision. At its free end, the spring is connected to a plunger, which acts on the contact. The latter is formed by a convexly curved disk or plate which snaps around when a button is pressed and comes into contact with the contacts or conductor tracks of a circuit board underneath.

Es ist ferner aus der DE-A-2721 710 bekannt, die Führungsplatte eines Tastensatzes mit über ihre Ebene hinausragenden, rohrförmigen Ansätzen zu versehen, um für die mit den Druckknöpfen der Tasten verbundenen Stößel eine längere Führung zu erhalten.It is also known from DE-A-2721 710 to provide the guide plate of a key set with tubular projections projecting beyond its level in order to obtain a longer guide for the plunger connected to the push buttons of the keys.

Aufgabe der vorliegenden Erfindung ist es, ein Fernsprechgerät mit einem gegen Vandalismus besonders geschützten Tastensatz zu schaffen. Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale des Anspruches 1.The object of the present invention is to provide a telephone set with a key set which is particularly protected against vandalism. This object is achieved by the characterizing features of claim 1.

Durch die getroffenen Maßnahmen ist der Wähltastensatz eines Fernsprechgerätes, insbesondere eines Münzfernsprechers, gegen die Einwirkung von Schlägen, Feuer und Flüssigkeiten nahezu unempfindlich. Dabei ist die Lösung für Tastensätze aller Art verwendbar, d. h. für Tastensätze mit Folienkontakten und für Tastensätze mit Kontaktfedern. Außerdem ist eine Ausführung angegeben, bei der handelsübliche Tastensätze unverändert bleiben können und dennoch gegen Beschädigungen der obengenannten Art geschützt sind.As a result of the measures taken, the dial key set of a telephone device, in particular a payphone, is almost insensitive to the effects of blows, fire and liquids. The solution can be used for all types of key sets, i. H. for key sets with foil contacts and for key sets with contact springs. In addition, a version is specified in which commercially available key sets can remain unchanged and are nevertheless protected against damage of the type mentioned above.

Die Erfindung wird an Ausführungsbeispielen näher erläutert, die in der zugehörigen Zeichnung dargestellt sind. Darin zeigt

  • Fig. 1 einen Querschnitt durch einen Teil eines erfindungsgemäßen Tastensatzes mit Folienkontakten,
  • Fig. 2 einen Querschnitt durch eine andere Ausführung des erfindungsgemäßen Tastensatzes, der einem üblichen Tastensatz vorgesetzt ist.
The invention is explained in more detail using exemplary embodiments which are illustrated in the associated drawing. It shows
  • 1 shows a cross section through part of a set of keys according to the invention with foil contacts,
  • Fig. 2 shows a cross section through another embodiment of the key set according to the invention, which is placed in front of a conventional key set.

Bei der in Fig. 1 gezeigten Ausführung ist eine metallene Führungsplatte 1, die an den Stellen der Tasten mit rohrförmigen, nach oben gerichteten Ansätzen 6 versehen ist, direkt auf Kontaktfolien 13 aufgesetzt. Deren Anzahl und Schichtung richtet sich nach dem Anwendungszweck. An den Stellen, an denen die in den Bohrungen 17 der Ansätze 6 geführten Stößel 5 auf die Kontaktfolien 13 wirken, stehen sich die Leiterbahnen 7 unterschiedlicher Folienschichten offen gegenüber, so daß sie beim Niederdrücken der jeweiligen Taste in Kontakt kommen.In the embodiment shown in FIG. 1, a metal guide plate 1, which is provided with tubular, upwardly directed projections 6 at the locations of the keys, is placed directly on contact foils 13. Their number and stratification depends on the application. At the points where the plunger 5 guided in the bores 17 of the lugs 6 act on the contact foils 13, the conductor tracks 7 of different foil layers face each other openly so that they come into contact when the respective key is depressed.

Die Stößel 5 sind pilzförmig gestaltet, wobei jeweils das gewölbte Dach 14 nach unten gegen die Kontaktfolien 13 und der Schaft 15 nach oben gerichtet ist. Auf letzteren ist das eine Ende einer Schraubendruckfeder 4 aufgesteckt, deren anderes Ende sich gegen den jeweiligen Druckknopf 3 abstützt. Die Druckknöpfe 3 haben hutförmigen Querschnitt. Die Wände des Hohlraumes 16 dienen als Führung auf dem rohrförmigen Ansatz 6 der Führungsplatte 1. Der Hohlraum 16 bildet die Aufnahme für das obere Ende der Schraubendruckfeder4, die die Rückstellung der Taste bewirkt.The plungers 5 are mushroom-shaped, with the curved roof 14 directed downwards against the contact foils 13 and the shaft 15 upwards. One end of a helical compression spring 4 is plugged onto the latter, the other end of which is supported against the respective push button 3. The push buttons 3 have a hat-shaped cross section. The walls of the cavity 16 serve as a guide on the tubular extension 6 of the guide plate 1. The cavity 16 forms the receptacle for the upper end of the helical compression spring4, which causes the key to be reset.

Die Außenwände der Druckknöpfe 3 sind in entsprechenden Durchbrüchen 18 eines Deckels 2 geführt, der auf die Führungsplatte 1 aufgesetzt ist. Der Deckel hat herabgezogene Seitenwände 19 und zwischen den Tasten Versteifungsrippen 20, die alle in der gleichen Ebene enden und die Berührungsflächen mit der Führungsplatte 1 bilden. Ihre Höhe bestimmt zugleich den Hub der Tasten, weil deren Druckknöpfe 3 am offenen Ende einen Bund 21 haben, der einerseits am Deckel 2 und andererseits an der Führungsplatte 1 anschlägt.The outer walls of the push buttons 3 are guided in corresponding openings 18 in a cover 2 which is placed on the guide plate 1. The cover has pulled-down side walls 19 and stiffening ribs 20 between the keys, all of which end in the same plane and form the contact surfaces with the guide plate 1. Their height also determines the stroke of the buttons because their push buttons 3 have a collar 21 at the open end, which strikes the cover 2 on the one hand and the guide plate 1 on the other hand.

Deckel 2, Führungsplatte 1 und Druckknöpfe 3 sind aus Metall gefertigt, vorzugsweise aus einer Aluminium-Druckgußlegierung. Dadurch ist der Tastensatz gegen Schläge und Feuer unempfindlich. Auch gegen Flüssigkeiten ist er geschützt, da an den Druckknöpfen nur geringe Mengen eindringen können, die dann in dem Raum zwischen Deckel 2 und Führungsplatte 1 verbleiben. Um den Abfluß aus diesem Raum zu ermöglichen, sind beispielsweise an der Stoßfuge zwischen Deckel und Führungsplatte Öffnungen 8 angebracht. Da der Tastensatz in schrägen bis senkrechten Flächen eingebaut wird, genügt es, wenn die Öffnungen 8 an der Unterseite vorhanden sind.Cover 2, guide plate 1 and push buttons 3 are made of metal, preferably of an aluminum die-cast alloy. This makes the button set insensitive to blows and fire. It is also protected against liquids, since only small amounts can penetrate the push buttons, which then remain in the space between cover 2 and guide plate 1. In order to allow the outflow from this space, openings 8 are made, for example, at the butt joint between the cover and the guide plate. Since the key set is installed in oblique to vertical surfaces, it is sufficient if the openings 8 are provided on the underside.

Die Ausführung nach Fig. 2 weist die gleiche Führungsplatte 1, den gleichen Deckel 2 und die gleichen Druckknöpfe 3 wie die zuvor beschriebene Ausführung auf. Da dieser Tastensatz als Schutz für normale, handelsübliche Tastwahlblöcke, die mechanischen und chemischen Angriffen nicht gewachsen sind, gedacht ist, entfallen die Kontaktfolien 13 der Ausführung nach Fig. 1. Außerdem kommen die Schraubendruckfedern 4 in Wegfall, da die Tasten 11 des handelsüblichen Tastwahlblockes 12 bereits solche Federn haben. Statt dessen sind die Stößel 10 so lang ausgeführt, daß sie den Abstand von der Unterseite der Führungsplatte 1 bis zur Innenseite des Druckknopfes 3 überbrücken. Zwischen dieser und dem oberen Ende des Stößels 10 ist ein elastisches Teil 9 aus Gummi oder dergleichen als Puffer eingefügt.2 has the same guide plate 1, the same cover 2 and the same push buttons 3 as the previously described embodiment. Since this key set is intended as protection for normal, commercially available keypad dialing blocks that are not capable of withstanding mechanical and chemical attacks, the contact foils 13 of the embodiment according to FIG. 1 are omitted. In addition, the helical compression springs 4 are omitted because the keys 11 of the commercially available keypad dialing block 12 already have such feathers. Instead, the plunger 10 are made so long that they bridge the distance from the underside of the guide plate 1 to the inside of the push button 3. Between this and the upper end of the plunger 10, an elastic member 9 made of rubber or the like is inserted as a buffer.

Bei beiden Ausführungen werden die durch Schlag auftretenden Kräfte vom Druckknopf 3 und der Führungsplatte 1 abgefangen, während von dem elastischen Teil 9 bzw. der Schraubendruckfeder 4 nur die normale Betätigungskraft auf die Tasten 11 bzw. Kontakte übertragen wird. Flüssigkeiten können nicht bis zu den Tasten oder Kontakten vordringen. Ebenso sind alle empfindlichen Teile gegen Hitzeeinwirkung abgeschirmt.In both versions, the forces caused by impact are released by push button 3 and the guide plate 1 intercepted, while only the normal actuation force is transmitted to the keys 11 or contacts from the elastic part 9 or the helical compression spring 4. Liquids cannot penetrate to the buttons or contacts. All sensitive parts are also shielded against the effects of heat.

Claims (6)

1. Telephone set with a pushbutton dialling keypad whose keytops (3) have hat-shaped cross sections, are guided in a cover (2) and are each, with the aid of a flexible member (4; 9), connected to a plunger (5; 10) serving to actuate the contacts (7; 11), characterized in that said cover (2) is placed on to a guide plate (1) having upright tubular extensions (6) which are overlapped by said keytops (3) and in which said plungers (5; 10) are guided, and that said guide plate (1), said cover (2) and said keytops (3) are all made of metal.
2. A telephone set as claimed in claim 1, characterized in that said flexible member (4) is a helical compression spring.
3. A telephone set as claimed in claim 1, characterized in that said flexible member (9) is a rubber plate.
4. A telephone set as claimed in claim 1, characterized in that the butt joint between said cover (2) and said guide plate (1), at least on one side of the keypad, is provided with discharge openings (8).
5. A telephone set as claimed in claim 1, characterized in that said plungers (5) act directly upon the contacts (7) disposed between the foil- type switching strips (13).
6. A telephone set as claimed in claim 1, characterized in that said plungers (10) act upon the keytops (11) of a pushbutton dialling keypad (12).
EP82103240A 1981-05-07 1982-04-17 Telephone equipment with selection keyboard Expired EP0064615B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82103240T ATE16539T1 (en) 1981-05-07 1982-04-17 TELEPHONE WITH DIAL BUTTON SET.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8113363U 1981-05-07
DE8113363U DE8113363U1 (en) 1981-05-07 1981-05-07 Telephone set with dialing set

Publications (3)

Publication Number Publication Date
EP0064615A2 EP0064615A2 (en) 1982-11-17
EP0064615A3 EP0064615A3 (en) 1983-08-24
EP0064615B1 true EP0064615B1 (en) 1985-11-13

Family

ID=6727388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103240A Expired EP0064615B1 (en) 1981-05-07 1982-04-17 Telephone equipment with selection keyboard

Country Status (5)

Country Link
EP (1) EP0064615B1 (en)
AT (1) ATE16539T1 (en)
AU (1) AU551245B2 (en)
DE (2) DE8113363U1 (en)
NZ (1) NZ200396A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014052560A1 (en) * 2012-09-27 2014-04-03 Trw Automotive U.S. Llc Actuator assembly having an external plunger sleeve

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136633A (en) * 1983-03-18 1984-09-19 Broderna Danielson Membrane switch assembly
US4528431A (en) * 1983-10-03 1985-07-09 International Business Machines Corporation Rocking switch actuator for a low force membrane contact switch
EP0240129A3 (en) * 1986-03-26 1989-05-03 Len Gordon Co Insulated switch assembly
WO1987007759A1 (en) * 1986-06-02 1987-12-17 Bebié + Co. Keyboard for use in difficult conditions
US5173578A (en) * 1988-11-18 1992-12-22 Matsushita Electric Industrial Co., Ltd. Push button switch assembly
EP0374273A1 (en) * 1988-12-17 1990-06-27 Lexmark International, Inc. PS/2-like keyboard protected against vandalism and spill
FR2669767A1 (en) * 1990-11-23 1992-05-29 Philips Electronics Nv Contactor for a control keyboard, and audiovisual apparatus including such a contactor
BE1006720A6 (en) * 1994-07-18 1994-11-22 Velleman Nv Membrane keyboard
JP3461765B2 (en) * 1999-10-12 2003-10-27 新晃電機株式会社 Push button switch
ES2190754B1 (en) * 2001-12-21 2005-09-01 Angel Iglesias, S.A DOUBLE STEP BUTTON.
DE102008015111B3 (en) * 2008-01-31 2009-06-10 Preh Gmbh Fluid protected control element for use in motor vehicle, has guide and groove walls extending in direction of rotary knob and pushbutton, and downpipe guiding fluid striking on guide plate onto printed circuit board's oppositely lying side
CN111383855B (en) * 2018-12-29 2022-11-11 深圳市伟鹏世纪科技有限公司 Power switch buffer structure

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Publication number Priority date Publication date Assignee Title
DE1462288B2 (en) * 1965-05-06 1970-02-05 Siemens AG, 1000 Berlin u. 8000 München Pay phone
CA1034175A (en) * 1975-04-16 1978-07-04 Pak-Jong Chu Multi-contact push-button switch
DE2721710A1 (en) * 1977-05-12 1978-11-16 Deutsche Telephonwerk Kabel Push button construction for telephone selector panels - has split spring ring opened out after predetermined button movement
FR2407561A1 (en) * 1977-10-25 1979-05-25 Telaris Telecomm Electrical switch assembly with cover plate with appropriate apertures - has key for each switch with follower springs and contact arrangement giving optimum pressure distribution
GB2046524A (en) * 1979-02-28 1980-11-12 Invader Keyboards Ltd Improvements relating to electric switches
DE2927859A1 (en) * 1979-07-10 1981-01-15 Sasse Eugen Gmbh Co Kg Dr Pushbutton selection keyboard for telecommunication appts. - has each button coupled to slider plate operating common contact set

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014052560A1 (en) * 2012-09-27 2014-04-03 Trw Automotive U.S. Llc Actuator assembly having an external plunger sleeve

Also Published As

Publication number Publication date
ATE16539T1 (en) 1985-11-15
EP0064615A2 (en) 1982-11-17
AU8319682A (en) 1982-11-11
DE3267364D1 (en) 1985-12-19
NZ200396A (en) 1985-07-12
DE8113363U1 (en) 1981-09-17
EP0064615A3 (en) 1983-08-24
AU551245B2 (en) 1986-04-24

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