EP0012279B1 - Commutateur à bouton-poussoir, en particulier pour claviers de machines à écrire et dispositifs similaires - Google Patents

Commutateur à bouton-poussoir, en particulier pour claviers de machines à écrire et dispositifs similaires Download PDF

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Publication number
EP0012279B1
EP0012279B1 EP19790104773 EP79104773A EP0012279B1 EP 0012279 B1 EP0012279 B1 EP 0012279B1 EP 19790104773 EP19790104773 EP 19790104773 EP 79104773 A EP79104773 A EP 79104773A EP 0012279 B1 EP0012279 B1 EP 0012279B1
Authority
EP
European Patent Office
Prior art keywords
key
contact
spring
key switch
spring section
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
EP19790104773
Other languages
German (de)
English (en)
Other versions
EP0012279A1 (fr
Inventor
Horst Stahl
Walter Wachs
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.)
Siemens AG
Original Assignee
Siemens 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
Priority claimed from DE2854096A external-priority patent/DE2854096C2/de
Priority claimed from DE19797914017U external-priority patent/DE7914017U1/de
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0012279A1 publication Critical patent/EP0012279A1/fr
Application granted granted Critical
Publication of EP0012279B1 publication Critical patent/EP0012279B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
    • 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
    • H01H13/52—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 immediately upon removal of operating force, e.g. bell-push switch

Definitions

  • the invention relates to a key switch, in particular for keyboards in typewriters and similar devices, for example teleprinters and data stations, with a key tappet which, when the key is pressed against the spring force, a helical spring attached between the key housing and a contact surface of the key tappet from the rest position into the working position is movable, the spring forming the movable contact piece, which is brought into contact with a stationary counter-contact when making contact, and whose key plunger can be moved even further by the contact.
  • the object of the invention is to identify and provide a key switch which is ergonomically particularly favorable for the operator, consists of a few individual parts and can be produced with little production outlay.
  • the solution to the problem is that the helical spring has two spring sections, of which the first spring section is designed in a known manner as a compression spring for returning the key tappet from the working position to the rest position and the second spring section on the side facing away from the first spring section the contact surface of the key tappet rests with a certain pretension, and that the counter-contact is arranged in the range of motion of the helical second spring section of the spring, which is extended over the contact surface of the key tappet.
  • the dimensions of the new key switch are particularly small, with the key height being particularly small.
  • the low height of the key is particularly important for ergonomic reasons, because it results in a posture that is less stressful for the operator when the key is pressed. This is particularly noticeable when the operator presses input keyboards that are located on operating surfaces of different heights.
  • the new key enables the height to be reduced to over half of the keys previously used in practical operation.
  • the key switch is reliable and inexpensive to manufacture.
  • the key switch consists of a few individual parts that can be assembled in a simple manner. The manufacture and assembly in a manufacturing machine is possible.
  • the mechanical contact is particularly safe and there is a low contact resistance between the closed contact elements. By using the helical return spring, a uniform pressure behavior is achieved when the button is pressed.
  • An advantageous embodiment of the new push button is that the two spring sections of the helical spring have different winding diameters. This has the advantage that the spring characteristics for the two spring sections can be selected differently.
  • a further advantageous embodiment of the new push button is that the first spring section has a smaller and the second spring section of the spring has a larger winding diameter. This has the advantage that a particularly soft response of the contact is achieved by the spring section with the larger diameter, although the required minimum contact pressure is given when contacting.
  • the spring section with the larger diameter can also be used to dampen the kickback for the key tappet when returning from the working position to the rest position.
  • a protective collar is arranged around the point to be protected on the key, which is open in the direction of the solder bath and via the Protected area protrudes.
  • the new key switch consists of egg Nem tappet 1, which is movable in a button housing 6 in a guide 7 when the button is pressed.
  • a collar 2 is firmly attached, which limits the movement of the key tappet 1 in the rest position of the key.
  • the contact surface 2a of the collar 2 is used to support a spring 4 for resetting.
  • the helical spring 4 consists of two spring sections 4a and 4b, which have different winding diameters. The first spring section 4a with the smaller winding diameter is used as a compression spring, while the second spring section 4b with the larger winding diameter is used for making contact.
  • the second spring section 4b which consists of at least one turn, rests with a pretension on a driving lug 5, which is firmly connected to the collar 2 of the key tappet.
  • the preload is selected so that the required contact pressure occurs when the contact is made.
  • the characteristic of the spring can be adjusted with the help of the winding diameter. A soft spring action is achieved due to the larger winding diameter selected compared to the spring section 4a, so that the operator does not have a hard pressure point when making contact.
  • the spring 4 is used as a movable contact element, the end being designed as a contact connection 9.
  • the mating contact 3 with its contact connection 8 is arranged in the key housing 6 in a stationary manner as a rigid contact element in the range of motion of the second spring section 4b.
  • the counter contact 3 is advantageously designed as a simple sheet metal plate.
  • the key housing 6 and the key tappet 1 with the firmly attached collar 2 and the support surface 2a and the driving nose 5 can be produced in a simple manner as plastic parts.
  • the contact surfaces of the mating contact 3 and the winding part 10 of the second spring section 4b, which lie one on top of the other when the key switch is contacted, are coated with a layer which increases the conductivity, for example gold or palladium, for better contact.
  • the key switch In the state shown in Fig. 1, the key switch is in the rest position, i.e. before pressing the button.
  • the key plunger 1 When the key is pressed, the key plunger 1 is moved in the direction of the arrow A by the operator's finger pressure by means of the attached key button.
  • the key tappet slides along the guide 7 in the key housing 6.
  • the spring section 4a is compressed.
  • the push button plunger 1 With the push button plunger 1, the collar 2 with the firmly attached driving lug 5 moves in the direction of the mating contact 3.
  • the driving lug 5 is turned on. the contact surface of the mating contact moves past and the winding part 10 of the spring section 4b comes into contact with the contact surface of the mating contact 3.
  • the contact is closed and there is an electrically conductive connection via the contact connection 9, the spring sections 4a and 4b, the mating contact 3 and the contact connection 8. Due to the prestressing of the spring section 4b, the winding part 10 rests on the counter contact when the contact is made with the required contact pressure. This closes the contact of the key switch without bouncing.
  • the key tappet 1 is moved further, so that the driver nose 5 comes to rest below the contact surface of the counter contact 3.
  • the winding part 10 lies freely on the contact surface of the mating contact 3. This prevents malfunctions during operation due to uneven presses, a decrease in finger pressure or tremors when the button is pressed.
  • the key tappet has then reached its end position, the working position, the movement being limited either by the bottom surface of the guide 7 or by the spring section 4a which can no longer be compressed.
  • the button plunger 1 When the operator releases the button, the button plunger 1 returns from the working position to the rest position.
  • the compressed spring section 4a which is delimited on the one hand by the button housing 6 and on the other hand by the contact surface 2a on the collar 2, presses the key tappet over the collar 2 in the direction of the arrow R.
  • the contacting is reliably interrupted when the driver nose 5 on the contact surface of the mating contact 3 moves past.
  • the spring section 4b then rests on the driving lug 5 with the predetermined pretension.
  • the return movement of the key tappet is limited either by the spring travel of the spring section 4a or by the housing on which the collar 2 abuts.
  • the impact of the key tappet 1 on the housing cover during the return movement is advantageously dampened by the spring section 4b.
  • FIGS. 2 and 3 show an advantageous exemplary embodiment of a key switch as a changeover contact which can be switched over between a normally closed contact and a normally open contact.
  • Fig. 2 shows a side view of the key switch in section.
  • Fig. 3 shows the arrangement of FIG. 2 in section in the view from above.
  • the push button consists of a button 11 which is attached to the push button 1.
  • the key stroke 1 is moved in the key housing 6.
  • the components required for the switching function of the changeover contact are contained in the key housing 6, which is closed off by a key cover (14) is engaged in a recess of a carrier plate 13 via latching springs 19 and 20, which absorbs the assembly and keying-in forces
  • Most housing 6 and the key cover 14 formed chamber protects the contacts and the related moving parts from external influences such as dust or vapors, which arise for example during the automatic soldering process of the circuit boards.
  • the key tappet 1 is guided in the guide 7 in the housing and a guide 15 in the key cover 14 when actuated.
  • a collar 2 is fixedly attached to the key tappet 1.
  • the first spring section 4a is supported on the support surface 2a on the underside of the collar 2.
  • the second spring section 4b of the helical spring 4 has a larger diameter than the spring section 4a and extends beyond the contact surface 2a.
  • the other end of the first spring section 4a is supported on the bottom surface of the key housing 6.
  • the driver lugs 5 and 17 are attached to the collar 2.
  • the counter contacts 3 and 16 are arranged in a fixed manner, the contact connections of which are connected to the printed circuit board 12.
  • the normally closed contact is closed, so that via the contact connection 9 and the spring sections 4a and 4b, there is an electrically conductive connection to the mating contact 16 and its contact connection (not shown) on the printed circuit board 12.
  • the uppermost turn 18 of the second spring section 4b rests on the contact surface of the mating contact 16 with the required contact pressure.
  • the contact surface of the counter-contact 16 comes to lie below the underside of the driving lug 17 and the spring tension is selected such that the uppermost turn rests on the contact surface with the contact pressure required for correct contacting.
  • the lowermost turn 10 of the second spring section 4b rests on the upper side of the driving lug 5 under prestress. The preload is selected so that it corresponds to the required contact pressure when making contact in the working state.
  • the key tappet 1 When the key is pressed in the direction of arrow A, the key tappet 1 is moved downward, and the first spring section 4a is thereby compressed. During the downward movement of the key tappet, the second spring section 4b is also moved. The driver nose 17 lifts the uppermost turn 18 of the second spring section 4b from the contact surface of the mating contact 16. From this point in time, the uppermost turn 18 rests on the underside of the driving lug 17 with a prestress corresponding to the contact pressure when the contact is made.
  • the push button returns to the rest position by the spring force of the first spring section 4a.
  • the driver nose 5 lifts the lowermost turn 10 of the spring section 4b from the contact surface of the mating contact 3.
  • the lowermost turn 10 of the spring section 4b then lies on the driving lug 5 with a prestress corresponding to the contact pressure when the contact is made.
  • the uppermost turn 18 of the second spring section 4b comes to lie on the contact surface of the mating contact 16 with the required contact pressure, which corresponds to the pretension on the driving lug 17. This is achieved in that the underside of the driver lug 17 comes to lie above the contact surface of the mating contact 16.
  • the upward movement is limited by the top of the collar 2, which abuts the key cover 14. In the idle state, there is the conductive connection via the mating contact 16, the spring sections 4b, 4a and the contact connection 9.
  • Fig. 4 shows a sectional view of the key switch with a protective collar against the effects of the solder bath.
  • a protective collar 19 which is open to the solder bath is formed on the key housing 6 made of plastic.
  • this protective device designed as a protective collar 19 the guide 7 is prevented from being deformed when the button with the circuit board 12 is immersed in a trailing or immersion solder bath under the action of heat from the solder, and the guide function is thus impaired.
  • a warping or damage to the protective collar 19 is of no importance since it has no influence on the function of the button. It is also think bar to remove the protective collar 19 after the soldering process. To facilitate removal, the protective collar 19 can be detachably connected to the button, for example.
  • the protective collar 19 is arranged in a ring around the point to be protected, namely the guide 7. It is also conceivable for it to have the shape of other geometric figures. It is expediently formed from the same material as the underside of the key switch.

Landscapes

  • Push-Button Switches (AREA)

Claims (17)

1. Interrupteur de touche, plus particulièrement pour claviers de machine à écrire et autres dispositifs semblables - par exemple de téléscripteurs et terminaux de téléinformatique - comportant une tige de touche (1) qui est susceptible d'être déplacée lors de l'actionnement de la touche de la position de repos dans la position de travail, à l'encontre de la force d'un ressort hélicoïdal (4) monté entre le boîtier de touche (6) et une surface d'appui (2a) de la tige de touche, le ressort (4) constituant la pièce de contact mobile qui est amenée en liaison avec un contact antagoniste fixe, lors de l'établissement du contact, et dont la tige de contact (1) peut continuer à se déplacer après l'établissement du contact, caractérisé par le fait que le ressort hélicoïdal (4) comporte deux sections de ressorts (4a, 4b) dont la première (4a) est réalisée, de manière connue, sous la forme d'un ressort de pression pour ramener la tige de touche (1 ) de la position de travail dans la position de repos, et dont la seconde (4b) repose, avec une tension préalable déterminée, sur le côté de la surface de repos (2a) de la tige de touche (1 ), qui est éloignée de la première section de ressort (4a), et caractérisé par le fait que le contact antagoniste (3) est disposé dans la zone de déplacement de la seconde section de ressort hélicoïdale (4b) du ressort (4) qui s'étend au-delà. de la surface d'appui (2a) de la tige de touche.
2. Interrupteur de touche selon la revendication 1, caractérisé par le fait que les deux sections de ressort (4a, 4b) du ressort hélicoïdal (4) ont des spires de diamètres différents.
3. Interrupteur de touche selon la revendication 2, caractérisé par le fait que la première section de ressort (4a) présente un diamètre de spire plus petit et la seconde section de ressort (4b) un diamètre de spire plus grand.
4. Interrupteur de touche selon la revendication 1, caractérisé par le fait que la seconde section de ressort (4a) est constituée par au moins une spire.
5. Interrupteur de touche selon la revendication 1, caractérisé par le fait que la spire la plus basse (10) de la seconde section de ressort (4b) repose, avec une tension préalable, sur le bec d'entraînement qui est fixé sur la tige de touche (1).
6. Interrupteur de touche selon la revendication 5, caractérisé par le fait que le bec d'entraînement (5) libère la seconde section de ressort (4b) lors de l'établissement du contact.
7. Interrupteur de touche selon la revendication 5, caractérisé par le fait qu'il est prévu sur la tige de touche (1) un premier et un second becs d'entraînement (5, 17) entre lesquels est disposée la seconde section de ressort (4b), par le fait qu'à l'état de repos la spire la plus basse (10) de la seconde section de ressort (4b) repose avec tension préalable sur le premier bec d'entraînement (5), par le fait que la spire supérieure (18) de la seconde section de ressort (4b) repose avec tension préalable sur un premier contact antagoniste (16) et par le fait que dans la position de travail la spire supérieure (18) de la seconde section de ressort (4b) repose avec tension préalable sur le second bec d'entraînement (17) alors que la spire la plus basse (10) de la seconde section de ressort (4b) repose avec tension préalable sur le second contact antagoniste (3).
8. Interrupteur de touche selon la revendication 1, caractérisé par le fait que la surface de contact de la seconde section de ressort (4b) et la surface de contact du contact antagoniste (3) sont revêtues d'une couche qui augmente la conductibilité des zones de contact.
9. Interrupteur de touche selon la revendication 6, caractérisé par le fait que la tige de touche (1) présente une course supplémentaire après l'établissement du contact.
10. Interrupteur de touche selon la revendication 1, caractérisé par le fait que l'extrémité de la seconde section de ressort (4b), qui est éloignée de la surface d'appui (2a), amortit le choc de la tige de touche contre un couvercle de touche (14) lors du déplacement de retour de la position de travail dans la position de repos.
11. Interrupteur de touche selon la revendication 1, caractérisé par le fait que la tension préalable correspond à la pression de contact à l'établissement du contact.
12. Interrupteur de touche selon la revendication 1, caractérisé par le fait que tes deux sections de ressort (4a, 4b), le contact antagoniste (3) et la partie de la tige de touche qui comporte la surface d'appui (2a) sont disposés dans une chambre (6, 14) fermée de toutes parts.
13. Interrupteur de touche selon la revendication 12, caractérisé par le fait que la chambre est fermée par un couvercle de touche (14) susceptible d'être enctiqueté:
14. Interrupteur de touche selon l'une des revendications 1 à 13, du type comportant un dispositif de protection pour protéger contre l'action d'un bain de soudure la partie du guidage (7) de la tige de touche (1) qui passe par une plaque de circuit imprimé (12), caractérisé par le fait qu'autour de l'emplacement à protéger de l'interrupteur de touche est prévue une collerette de protection (19) qui est ouverte en direction du bain de soudure et qui s'étend au-delà de l'emplacement à protéger.
15. Interrupteur de touche selon la revendication 14, caractérisé par le fait que la collerette de protection (19) est disposée annulairementautour de l'emplacement à protéger.
16. Interrupteur de touche selon la revendication 14 ou 15, caractérisé par le fait que la collerette de protection (19) est en matière plastique et qu'elle est conformée sur le boîtier (6) de l'interrupteur de touche (1 ).
EP19790104773 1978-12-14 1979-11-29 Commutateur à bouton-poussoir, en particulier pour claviers de machines à écrire et dispositifs similaires Expired EP0012279B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2854096 1978-12-14
DE2854096A DE2854096C2 (de) 1978-12-14 1978-12-14 Tastenschalter, insbesondere für Tastaturen in Schreibmaschinen und ähnlichen Einrichtungen
DE7914017U 1979-05-15
DE19797914017U DE7914017U1 (de) 1979-05-15 1979-05-15 Schutzeinrichtung fuer ein mittels eines loetbads in einer leiterplatte verloetbares bauelement

Publications (2)

Publication Number Publication Date
EP0012279A1 EP0012279A1 (fr) 1980-06-25
EP0012279B1 true EP0012279B1 (fr) 1982-07-07

Family

ID=25776861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790104773 Expired EP0012279B1 (fr) 1978-12-14 1979-11-29 Commutateur à bouton-poussoir, en particulier pour claviers de machines à écrire et dispositifs similaires

Country Status (3)

Country Link
EP (1) EP0012279B1 (fr)
CS (1) CS216691B2 (fr)
MX (1) MX147268A (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH072995Y2 (ja) * 1987-07-21 1995-01-30 三菱電機株式会社 機関のアイドル位置検出スイツチ
GB2209434B (en) * 1987-08-19 1991-11-27 Crabtree Electrical Ind Ltd Switches
GB2371022B (en) * 2000-12-29 2005-01-12 Nokia Mobile Phones Ltd A portable communication device
US6965789B2 (en) 2000-12-29 2005-11-15 Vertu Limited Portable communication device
GB2371021B (en) * 2000-12-29 2005-07-27 Nokia Mobile Phones Ltd A portable communication device
DE102011013286A1 (de) * 2010-03-12 2011-09-15 Marquardt Mechatronik Gmbh Elektrischer Schalter
CN109192579A (zh) * 2018-10-31 2019-01-11 歌尔科技有限公司 腕戴类设备及其按键

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1761252U (de) * 1956-10-04 1958-02-13 Lorenz C Ag Bauteil fuer tauchgeloetete bzw. gedruckte schaltungen.
GB1411761A (en) * 1972-01-19 1975-10-29 Plessey Co Ltd Electric switches
GB1460021A (en) * 1973-01-24 1976-12-31 Gen Electric Co Ltd Electric switches
DE2460457A1 (de) * 1974-12-20 1976-06-24 Gerhard Dekorsy Drucktaster insbesondere zur schaltung elektronischer vorrichtungen
SE398572B (sv) * 1975-12-22 1977-12-27 Raeder Eskil Tryckknapp
DE2743156A1 (de) * 1977-09-24 1979-04-05 Baer Elektrowerke Kg Tastschalter zur elektrischen kontaktgabe

Also Published As

Publication number Publication date
MX147268A (es) 1982-11-01
CS216691B2 (en) 1982-11-26
EP0012279A1 (fr) 1980-06-25

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