EP0024724B1 - Push-button switch for telecommunication - Google Patents

Push-button switch for telecommunication Download PDF

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Publication number
EP0024724B1
EP0024724B1 EP80105095A EP80105095A EP0024724B1 EP 0024724 B1 EP0024724 B1 EP 0024724B1 EP 80105095 A EP80105095 A EP 80105095A EP 80105095 A EP80105095 A EP 80105095A EP 0024724 B1 EP0024724 B1 EP 0024724B1
Authority
EP
European Patent Office
Prior art keywords
springs
plastic
contact
fact
press switch
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
EP80105095A
Other languages
German (de)
French (fr)
Other versions
EP0024724A1 (en
Inventor
Karl-Heinz Ing. grad. Niederhöfer
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.)
Tenovis GmbH and Co KG
Original Assignee
Telefonbau und Normalzeit 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 Telefonbau und Normalzeit GmbH filed Critical Telefonbau und Normalzeit GmbH
Priority to AT80105095T priority Critical patent/ATE5035T1/en
Publication of EP0024724A1 publication Critical patent/EP0024724A1/en
Application granted granted Critical
Publication of EP0024724B1 publication Critical patent/EP0024724B1/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
    • H01H13/02—Details
    • H01H13/10—Bases; Stationary contacts mounted thereon

Definitions

  • the invention relates to a pressure switch for telecommunications, in particular telephone technology, in which a button with a button shaft is guided in a housing and in which plastic springs are attached between the end of the button shaft and the contact spring so that the contact springs when the button is pressed indirectly via the Plastic springs are operated.
  • Known pressure switches are mostly provided with a button and a push-button shaft and act on contact springs which are arranged next to or below the push-button shaft. They have a high construction, require complex production and are particularly prone to contact bouncing.
  • a pressure switch is already known (DE-A1 2 615 217), in which resilient plastic parts are attached between the push-button shaft and the contact springs.
  • the plastic parts protrude downwards from a guide plate and are designed as short, cam-like tabs.
  • the contact points and the actuation points for the contact springs and the plastic springs are all in one plane. This version gives poor results in terms of bounce.
  • the invention is based on the object of designing a pressure switch of the type mentioned at the outset in such a way that a simple structure which is well suited for automatic assembly and has a low overall height is achieved and that, in particular, extensive freedom from bounce is achieved.
  • the plastic part is frame-shaped and a projecting shoulder with the two plastic springs is attached to a narrow side and that the contact springs overlap the shoulder with their middle part.
  • the plastic part is expediently fastened to the associated contact parts on a printed circuit board.
  • the pressure switch shown in FIGS. 1 to 3 has a housing 1 in which the button 2 is guided with the button shaft 3.
  • the key shaft is designed as a symmetrical cross and the guide takes place in a correspondingly designed opening 4.
  • the key button 2 is inserted from the outside into the housing 1 and has resilient hooks 5 with which it lies behind the edges 6 of recesses, so that it locks itself when installed.
  • the housing is attached to an underlying circuit board 7.
  • the plastic part 8 is frame-shaped and is provided on one narrow side with a projecting projection 9 on which plastic springs 10 and 11 are attached. Parallel to the plastic springs 10 and 11, contact springs 12 and 13 are arranged, which overlap the shoulder 9 with their bow-shaped central part 14. At point 15 they are connected to the circuit board 7.
  • contact strips 16 and 17 are attached in the frame-shaped plastic part, which carry noble metal contacts 18, while the contact springs 12, 13 are provided with noble metal contacts 19.
  • An actuating projection 20, which is at a distance from the contact points 18, 19, is injection molded onto each of the plastic springs 10, 11.
  • a return spring 22 After actuation, a return spring 22 returns the button to the rest position, so that the contact springs 12, 13 and plastic springs 10, 11 also assume their starting position.
  • the pressure switch can easily be strung together to form a key block, in which case the plastic parts 8 and the contact strips 16, 17 are combined to form a unit for several keys. Their electrical connection then takes place above the printed circuit boards mainly by means of metallic contact parts, so that conductor tracks are saved.

Landscapes

  • Push-Button Switches (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)

Abstract

1. Press switch for telecommunication engineering, especially for telephone technology, in which a button head (2) with a button shaft (3) is fitted in a casing (1), and in which plastic springs (10, 11) are accommodated between the end of the button shaft (3) and the contact springs (12, 13) in such a way that, when the button head (2) is pressed, the contact springs (12, 13) are indirectly operated via the plastic springs (10, 11), characterized by the fact that the plastic springs (10, 11) and the contact springs (12, 13) with their counter contacts (18) arranged on contact strips (16, 17) are attached to a plastic part (8) fixed under the casing (1), and that the actuating point of the end (21) of the button shaft (3) for the plastic springs (10, 11) and an actuating projection (20) moulded to the plastic springs (10, 11) for the contact springs (12, 13), viewed in the sense of length of the springs (10 through 13), are arranged at a distance from the contact points (18, 19).

Description

Die Erfindung betrifft einen Druckschalter für die Nachrichtentechnik, insbesondere Fernsprechtechnik, bei dem ein Tastenknopf mit einem Tastenschaft in einem Gehäuse geführt ist und bei dem zwischen dem Ende des Tastenschaftes und den Kontaktfedem Kunststoffedern so angebracht sind, dass die Kontaktfedern beim Drücken des Tastenknopfes indirekt über die Kunststoffedern betätigt werden.The invention relates to a pressure switch for telecommunications, in particular telephone technology, in which a button with a button shaft is guided in a housing and in which plastic springs are attached between the end of the button shaft and the contact spring so that the contact springs when the button is pressed indirectly via the Plastic springs are operated.

Bekannte Druckschalter sind zumeist mit einem Tastenknopf und einem Tastenschaft versehen und wirken bei der Betätigung auf Kontaktfedern ein, die neben dem Tastenschaft oder darunter angeordnet sind. Sie besitzen eine hohe Bauweise, bedingen eine aufwendige Fertigung und neigen insbesondere stark zum Kontaktprellen.Known pressure switches are mostly provided with a button and a push-button shaft and act on contact springs which are arranged next to or below the push-button shaft. They have a high construction, require complex production and are particularly prone to contact bouncing.

Es ist bereits ein Druckschalter bekannt (DE-A1 2 615 217), bei dem federnde Kunststoffteile zwischen dem Tastenschaft und den Kontaktfedern angebracht sind. Die Kunststoffteile ragen bei dieser Ausführung aus einer Führungsplatte nach unten heraus und sind als kurze, nockenartige Lappen ausgebildet. Hier liegen die Kontaktstellen und die Betätigungspunkte für die Kontaktfedern und die Kunststoffedern alle in einer Ebene. Bei dieser Ausführung ergeben sich schlechte Resultate hinsichtlich der Prellneigung.A pressure switch is already known (DE-A1 2 615 217), in which resilient plastic parts are attached between the push-button shaft and the contact springs. In this embodiment, the plastic parts protrude downwards from a guide plate and are designed as short, cam-like tabs. Here the contact points and the actuation points for the contact springs and the plastic springs are all in one plane. This version gives poor results in terms of bounce.

Der Erfindung liegt die Aufgabe zugrunde, einen Druckschalter der eingangs genannten Art so auszubilden, dass ein einfacher, für eine automatische Montage gut geeigneter Aufbau mit geringer Bauhöhe erreicht wird und dass insbesondere eine weitgehende Prellfreiheit erzielt wird.The invention is based on the object of designing a pressure switch of the type mentioned at the outset in such a way that a simple structure which is well suited for automatic assembly and has a low overall height is achieved and that, in particular, extensive freedom from bounce is achieved.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die Kunststoffedern und die Kontaktfedern mit ihren auf Kontaktstreifen angeordneten Gegenkontakten in einem unterhalb des Gehäuses befestigten Kunststoffteil angebracht sind und dass der Betätigungspunkt des Endes des Tastenschaftes für die Kunststoffedern und ein an den Kunststoffedern angespritzter Betätigungsvorsprung für die Kontaktfedern in Längsrichtung der Federn gesehen mit Abstand von den Kontaktstellen angeordnet sind.This object is achieved according to the invention in that the plastic springs and the contact springs with their mating contacts arranged on contact strips are attached in a plastic part fastened below the housing, and in that the actuation point of the end of the push-button shaft for the plastic springs and an actuation projection for the contact springs molded onto the plastic springs in Seen in the longitudinal direction of the springs are arranged at a distance from the contact points.

Ein vorteilhafter Aufbau des Druckschalters ergibt sich weiterhin dadurch, dass das Kunststoffteil rahmenförmig ausgebildet ist und an einer Schmalseite ein vorspringenderAbsatz mit den beiden Kunststofffedern angebracht ist und dass die Kontaktfedern den Ansatz bügelförmig mit ihrem Mittelteil übergreifen. Zweckmässigerweise ist das Kunststoffteil mit den zugehörigen Kontaktteilen auf einer Leiterplatte befestigt.An advantageous construction of the pressure switch also results from the fact that the plastic part is frame-shaped and a projecting shoulder with the two plastic springs is attached to a narrow side and that the contact springs overlap the shoulder with their middle part. The plastic part is expediently fastened to the associated contact parts on a printed circuit board.

Anhand eines Ausführungsbeispieles wird die Erfindung in Verbindung mit den Zeichnungen nachfolgend näher erläutert. Es zeigt:

  • Fig. 1 den erfindungsgemässen Druckschalter in der Vorderansicht im Schnitt,
  • Fig. 2 den Druckschalter in der Seitenansicht im Schnitt,
  • Fig. 3 den Druckschalter ohne Gehäuse in der Draufsicht.
Using an exemplary embodiment, the invention is explained in more detail below in connection with the drawings. It shows:
  • 1 is a sectional front view of the pressure switch according to the invention,
  • 2 the pressure switch in a side view in section,
  • Fig. 3 shows the pressure switch without housing in plan view.

Der in den Fig. 1 bis 3 dargestellte Druckschalter besitzt ein Gehäuse 1 in dem der Tastenknopf 2 mit dem Tastenschaft 3 geführt ist. Der Tastenschaft ist als symmetrisches Kreuz ausgebildet und die Führung erfolgt in einer entsprechend ausgebildeten Öffnung 4. Der Tastenknopf 2 wird von aussen in das Gehäuse 1 eingesetzt und besitzt federnde Haken 5, mit denen er sich hinter die Kanten 6 von Ausnehmungen legt, so dass er sich in eingebautem Zustand selbst verriegelt. Das Gehäuse ist auf einer darunterliegenden Leiterplatte 7 befestigt.The pressure switch shown in FIGS. 1 to 3 has a housing 1 in which the button 2 is guided with the button shaft 3. The key shaft is designed as a symmetrical cross and the guide takes place in a correspondingly designed opening 4. The key button 2 is inserted from the outside into the housing 1 and has resilient hooks 5 with which it lies behind the edges 6 of recesses, so that it locks itself when installed. The housing is attached to an underlying circuit board 7.

Vor dem Aufsetzen des Gehäuses 1 auf die Leiterplatte 7 wird auf dieser ein Kunststoffteil 8 angebracht. Das Kunststoffteil 8 ist rahmenförmig ausgebildet und an einer Schmalseite mit einem vorspringenden Ansatz 9 versehen, an dem Kunststoffedern 10 und 11 angebracht sind. Parallel zu den Kunststoffedern 10 und 11 sind Kontaktfedern 12 und 13 angeordnet, die mit ihrem bügelförmigen Mittelteil 14 den Ansatz 9 übergreifen. An der Stelle 15 sind sie mit der Leiterplatte 7 verbunden.Before the housing 1 is placed on the printed circuit board 7, a plastic part 8 is attached to it. The plastic part 8 is frame-shaped and is provided on one narrow side with a projecting projection 9 on which plastic springs 10 and 11 are attached. Parallel to the plastic springs 10 and 11, contact springs 12 and 13 are arranged, which overlap the shoulder 9 with their bow-shaped central part 14. At point 15 they are connected to the circuit board 7.

Beiderseits der Kontaktfedern 12, 13 sind in dem rahmenförmigen Kunststoffteil 8 Kontaktstreifen 16 und 17 angebracht, die Edelmetallkontakte 18 tragen, während die Kontaktfedern 12, 13 mit Edelmetallkontakten 19 versehen sind.On both sides of the contact springs 12, 13 8 contact strips 16 and 17 are attached in the frame-shaped plastic part, which carry noble metal contacts 18, while the contact springs 12, 13 are provided with noble metal contacts 19.

An den Kunststoffedern 10, 11 ist jeweils ein Betätigungsvorsprung 20 mit angespritzt, der im Abstand von den Kontaktstellen 18, 19 liegt.An actuating projection 20, which is at a distance from the contact points 18, 19, is injection molded onto each of the plastic springs 10, 11.

Beim Betätigen des Tastenknopfes 2 werden über das keilförmige Ende 21 des Tastenschaftes 3 die Kunststoffedern 10 und 11 ausgelenkt und diese wiederum verschwenken über ihre Betätigungsvorsprünge 20 die Kontaktfedern 12 und 13, so dass die Edelmetallkontakte 19 zur Anlage an die Edelmetallkontakte 18 der Kontaktstreifen 16 und 17 gelangen. Es erfolgt also eine indirekte Betätigung der senkrecht zur Betätigungsrichtung angeordneten Kontaktfedern mit weitgehender Prellfreiheit.When the button 2 is pressed, the plastic springs 10 and 11 are deflected via the wedge-shaped end 21 of the push-button shaft 3 and these in turn pivot the contact springs 12 and 13 via their actuating projections 20, so that the noble metal contacts 19 rest against the noble metal contacts 18 of the contact strips 16 and 17 reach. There is therefore an indirect actuation of the contact springs arranged perpendicular to the actuation direction with largely no bounce.

Durch eine verschieden gewählte Ausbildung des keilförmigen Endes 21 des Tastenschaftes 3 kann ein mehr oder weniger starker Druckpunkt bei der Betätigung erreicht werden.Through a differently selected configuration of the wedge-shaped end 21 of the push-button shaft 3, a more or less strong pressure point can be achieved when actuated.

Nach der Betätigung führt eine Rückstellfeder 22 den Tastenknopf in die Ruhestellung zurück, so dass auch die Kontaktfedern 12, 13 und Kunststoffedern 10, 11 ihre Ausgangslage einnehmen.After actuation, a return spring 22 returns the button to the rest position, so that the contact springs 12, 13 and plastic springs 10, 11 also assume their starting position.

Der Druckschalter lässt sich leicht zu einem Tastenblock aneinanderreihen, wobei dann die Kunststoffteile 8 und die Kontaktstreifen 16, 17 für mehrere Tasten zu einer Einheit zusammengefasst sind. Ihre elektrische Verbindung erfolgt dann oberhalb der Leiterplatten überwiegend durch metallische Kontaktteile, so dass Leiterzüge eingespart werden.The pressure switch can easily be strung together to form a key block, in which case the plastic parts 8 and the contact strips 16, 17 are combined to form a unit for several keys. Their electrical connection then takes place above the printed circuit boards mainly by means of metallic contact parts, so that conductor tracks are saved.

Claims (7)

1. Press switch for telecommunication engineering, especially for telephone technology, in which a button head (2) with a button shaft (3) is fitted in a casing (1), and in which plastic springs (10, 11) are accommodated between the end of the button shaft (3) and the contact springs (12, 13) in such a way that, when the button head (2) is pressed, the contact springs (12, 13) are indirectly operated via the plastic springs (10, 11), characterized by the fact that the plastic springs (10, 11) and the contact springs (12, 13) with their counter contacts (18) arranged on contact strips (16, 17) are attached to a plastic part (8) fixed under the casing (1), and that the actuating point of the end (21 ) of the button shaft (3) for the plastic springs (10, 11) and an actuating projection (20) moulded to the plastic springs (10, 11) for the contact springs (12, 13), viewed in the sense of length of the springs (10 through 13), are arranged at a distance from the contact points (18, 19).
2. Press switch according to claim 1, characterized by the fact that the plastic part (8) is fitted out like a frame, and on a narrow side a projecting stud (9) is installed with the two plastic springs (10, 11), and that the contact springs (12, 13) overlap the stud (9) with their middle part (14) like bails.
3. Press switch according to claim 1, characterized by the fact that the plastic part (8) with the associated contact parts is fixed to a circuit board (7).
4. Press switch according to claim 1, characterized by the fact that the plastic parts (8) and the contact strips (16, 17) are combined into one unit suitable for several switches.
5. Press switch according to claim 1, characterized by the fact that the end (21) of the button shaft (3) is wedge-shaped and, depending on the design of the angle of the wedge-shaped end (21), a more or less hard center of pressure for operation is obtained.
6. Press switch according to claim 1, characterized by the fact that the button shaft (3) is shaped like a symmetrical cross and thereby inserted in a corresponding opening (4) of the casing (1).
7. Press switch according to claim 3, characterized by the fact that the electrical connection of the switches above the circuit board (7) is effected through the metallic contact strips (16, 17).
EP80105095A 1979-09-03 1980-08-27 Push-button switch for telecommunication Expired EP0024724B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105095T ATE5035T1 (en) 1979-09-03 1980-08-27 PRESSURE SWITCH FOR COMMUNICATION TECHNOLOGY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2935557 1979-09-03
DE2935557A DE2935557C2 (en) 1979-09-03 1979-09-03 Pressure switches for communications engineering.

Publications (2)

Publication Number Publication Date
EP0024724A1 EP0024724A1 (en) 1981-03-11
EP0024724B1 true EP0024724B1 (en) 1983-10-12

Family

ID=6079938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105095A Expired EP0024724B1 (en) 1979-09-03 1980-08-27 Push-button switch for telecommunication

Country Status (4)

Country Link
EP (1) EP0024724B1 (en)
AT (1) ATE5035T1 (en)
AU (1) AU6195080A (en)
DE (1) DE2935557C2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3608703A1 (en) * 1986-03-15 1987-09-24 Siedle & Soehne S Switching element
FR2646434B2 (en) * 1988-06-29 1991-08-30 Inst Francais Du Petrole FORMULATION OF FUEL ADDITIVES COMPRISING AT LEAST ONE COMPOSITION OBTAINED FROM A HYDROXYMIDAZOLINE AND A POLYAMINE AND ITS USE AS A FUEL ADDITIVE

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2462034C3 (en) * 1974-08-22 1981-10-08 Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen Key suitable for assembling keyboards
US3982081A (en) * 1974-09-04 1976-09-21 Amp Incorporated Keyboard assembly with overlapped flexible printed circuit cable switch
DE2615217A1 (en) * 1976-04-08 1977-10-20 Standard Elektrik Lorenz Ag Push button switch with guide plate - has actuating cam between contact springs and push button pin hinged to guide plate
IT1114143B (en) * 1977-09-12 1986-01-27 Sits Soc It Telecom Siemens KEYBOARD FOR TELECOMMUNICATIONS SYSTEMS

Also Published As

Publication number Publication date
EP0024724A1 (en) 1981-03-11
ATE5035T1 (en) 1983-10-15
DE2935557A1 (en) 1981-03-12
DE2935557C2 (en) 1983-03-31
AU6195080A (en) 1981-03-12

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