EP0012279A1 - 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

Info

Publication number
EP0012279A1
EP0012279A1 EP79104773A EP79104773A EP0012279A1 EP 0012279 A1 EP0012279 A1 EP 0012279A1 EP 79104773 A EP79104773 A EP 79104773A EP 79104773 A EP79104773 A EP 79104773A EP 0012279 A1 EP0012279 A1 EP 0012279A1
Authority
EP
European Patent Office
Prior art keywords
contact
key
spring
key switch
switch according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP79104773A
Other languages
German (de)
English (en)
Other versions
EP0012279B1 (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

Links

Images

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 tappet 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 helical spring has two sections, of which the first section is designed in a manner known per se as a compression spring for returning the key tappet from the working position to the rest position, that the second spring section on that of the first spring section opposite side of the support surface rests with a certain preload, and that the counter-contact is arranged in the range of movement of the helical second section of the spring, which is extended over the support 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 button is ergonomic This is particularly important for reasons because when the buttons are pressed, the operator's posture is less stressful. This is particularly noticeable when the operator actuates input keyboards that are mounted on operating surfaces of different heights.
  • the new button enables the height to be reduced to more than half of the buttons 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 sections of the helical spring have different winding diameters. This has the advantage that the spring characteristics for the two spring sections can be chosen differently.
  • the first section has a smaller and the second section of the spring has a larger winding diameter.
  • the spring section with the larger diameter is also used to dampen the kickback can be used 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 a key plunger 1, which is movable in a key housing 6 in a guide 7 when the key is pressed.
  • a collar 2 is firmly attached, which limits the movement of the plunger 1 upwards when the key is in the rest position.
  • the contact surface 2a the federal government 2 used to support the return spring 4.
  • the helical spring 4 consists of 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 section 4b with the larger winding diameter is used for contacting.
  • the second spring section 4b which consists of at least one turn, rests with a pretension on the 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 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 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 long in the guide 7 in the 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 moved past the contact surface of the mating contact and the winding part 10 of the spring section 4b comes into contact with the contact surface of the 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 counter 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 plunger 1 is moved further, so that the driver nose 5 comes to rest below the contact surface of the mating contact 3.
  • the winding part 10 lies freely on the contact surface of the mating contact. This prevents malfunctions during operation due to uneven pressing, a decrease in finger pressure or trembling 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 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 contact 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 tappet 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 completed by the key cover 14.
  • the key cover 14 is when placed on the housing 6 via the Rastna attached to the housing sen 14a and 14b positively connected by snapping.
  • the housing 6 is snapped into a recess in a carrier plate 13 via the detent springs 19 and 20, which absorbs the assembly and engagement forces.
  • a circuit board 12 is arranged on the underside of the key housing 6, to which the contact connections 8 and 9 are soldered.
  • the chamber formed by the key housing 6 and a key cover 14 protects the contacts and the moving parts associated therewith from external influences such as dust or vapors which arise, for example, during the automatic soldering process of the printed 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 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 there is an electrically conductive connection to the contact 16 and its contact connection (not shown) on the printed circuit board 12 via the contact connection 9 and d ⁇ spring sections 4a and 4b.
  • 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. This requires that the contact surface of the mating contact 16 below the lower side of the driving lug 17 comes to rest, and the spring tension is selected so 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 actuated in the direction of arrow A, the key tappet 1 is moved downward, thereby compressing the first spring section 4a. When the key tappet moves downward, the second spring section 4b is also moved. The driver nose 17 lifts the uppermost turn 18cbs 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 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 driving 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 contact elements 16, 4b, 4a and 9.,
  • Fig. 4 shows a sectional view of the key switch with a protective collar against the effects of the solder bath.
  • this protective device designed as a protective collar 19 the plunger guide 7 is prevented from being deformed when the button with the circuit board 12 is immersed in the trailing or immersion solder bath under the action of heat from the solder, and the guiding function is thus impaired.
  • the protective collar 19 In contrast, when soldering in a trailing solder bath, for example a wave solder bath, it is necessary for the protective collar 19 to protrude so far beyond the plunger guide 7 that the formation of an air cushion is ensured. 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 conceivable to remove the protective collar 19 after the soldering process. To facilitate removal, the protective scraper 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 tappet 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)
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 true EP0012279A1 (fr) 1980-06-25
EP0012279B1 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)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824691A1 (de) * 1987-07-21 1989-02-02 Mitsubishi Electric Corp Leerlauf-detektorschalter fuer eine brennkraftmaschine
EP0303872A2 (fr) * 1987-08-19 1989-02-22 Crabtree Electrical Industries Limited Interrupteurs électriques
GB2371022A (en) * 2000-12-29 2002-07-17 Nokia Mobile Phones Ltd A portable communication device
GB2371021A (en) * 2000-12-29 2002-07-17 Nokia Mobile Phones Ltd A portable communication device
US6965789B2 (en) 2000-12-29 2005-11-15 Vertu Limited Portable communication device
WO2011110332A1 (fr) * 2010-03-12 2011-09-15 Marquardt Mechatronik Gmbh Commutateur électrique
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

Citations (7)

* 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.
DE2403108A1 (de) * 1973-01-24 1974-07-25 Gen Electric Co Ltd Elektrischer schalter
GB1411761A (en) * 1972-01-19 1975-10-29 Plessey Co Ltd Electric switches
DE2460457A1 (de) * 1974-12-20 1976-06-24 Gerhard Dekorsy Drucktaster insbesondere zur schaltung elektronischer vorrichtungen
DE2352280B2 (de) * 1973-10-18 1976-12-09 S. Siedle & Söhne Telefon- und TeIe-grafenwerke GmbH, 7743 Furtwangen Elektrischer drucktastenschalter
DE2657783A1 (de) * 1975-12-22 1977-07-07 Eskil Raeder Drucktastenschalter und tastensatz
DE2743156A1 (de) * 1977-09-24 1979-04-05 Baer Elektrowerke Kg Tastschalter zur elektrischen kontaktgabe

Patent Citations (7)

* 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
DE2403108A1 (de) * 1973-01-24 1974-07-25 Gen Electric Co Ltd Elektrischer schalter
DE2352280B2 (de) * 1973-10-18 1976-12-09 S. Siedle & Söhne Telefon- und TeIe-grafenwerke GmbH, 7743 Furtwangen Elektrischer drucktastenschalter
DE2460457A1 (de) * 1974-12-20 1976-06-24 Gerhard Dekorsy Drucktaster insbesondere zur schaltung elektronischer vorrichtungen
DE2657783A1 (de) * 1975-12-22 1977-07-07 Eskil Raeder Drucktastenschalter und tastensatz
DE2743156A1 (de) * 1977-09-24 1979-04-05 Baer Elektrowerke Kg Tastschalter zur elektrischen kontaktgabe

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824691A1 (de) * 1987-07-21 1989-02-02 Mitsubishi Electric Corp Leerlauf-detektorschalter fuer eine brennkraftmaschine
EP0303872A2 (fr) * 1987-08-19 1989-02-22 Crabtree Electrical Industries Limited Interrupteurs électriques
EP0303872A3 (fr) * 1987-08-19 1990-01-17 Crabtree Electrical Industries Limited Interrupteurs électriques
GB2371022A (en) * 2000-12-29 2002-07-17 Nokia Mobile Phones Ltd A portable communication device
GB2371021A (en) * 2000-12-29 2002-07-17 Nokia Mobile Phones Ltd A portable communication device
GB2371022B (en) * 2000-12-29 2005-01-12 Nokia Mobile Phones Ltd A portable communication device
GB2371021B (en) * 2000-12-29 2005-07-27 Nokia Mobile Phones Ltd A portable communication device
US6965789B2 (en) 2000-12-29 2005-11-15 Vertu Limited Portable communication device
WO2011110332A1 (fr) * 2010-03-12 2011-09-15 Marquardt Mechatronik Gmbh Commutateur électrique
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

Also Published As

Publication number Publication date
CS216691B2 (en) 1982-11-26
EP0012279B1 (fr) 1982-07-07
MX147268A (es) 1982-11-01

Similar Documents

Publication Publication Date Title
DE2854096C2 (de) Tastenschalter, insbesondere für Tastaturen in Schreibmaschinen und ähnlichen Einrichtungen
DE2351367C2 (de) Tastatur für eine Wählvorrichtung in einem Fernmeldegerät
DE2341521C3 (de) Drucktastenschalter
DE2411426C3 (de) Druckknopfschalter für elektronische Rechner o.dgi
DE2260346A1 (de) Drucktaste
DE4109033C2 (de) Drucktastenmechanismus
DE3145130C2 (fr)
DE10159856B4 (de) Mehrstufiger Klickschalter
EP0012279B1 (fr) Commutateur à bouton-poussoir, en particulier pour claviers de machines à écrire et dispositifs similaires
DE2918640A1 (de) Druckknopfschalter
DE19534611C2 (de) Kippschalter
DE8119605U1 (de) "Drucktastenschalter"
DE2142872A1 (de) Druckknopfschalter
DE4022164C2 (fr)
DE4312771A1 (de) Zweistufentaster
EP0643408B1 (fr) Interrupteur à bouton-poussoir
DE3301058C2 (de) Kapazitive Tastenanordnung für ein flach profiliertes Tastenfeld
DE2942720C2 (de) Drucktaste mit Schnappwirkung
DE2705756C2 (de) Druckknopfschalter für elektronische Tischrechner o.dgl.
DE10191618B3 (de) Druckschalter mit einer verbesserten Klickfeder
DE1218593B (de) Flachkontaktstueck
DE3010515C2 (fr)
DE2853810B1 (de) Druckknopftaster
DE9111790U1 (de) Eingabe-Tastatur für Computer o.dgl.
EP0306897A2 (fr) Commutateur pour poste téléphonique

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH FR GB IT NL SE

17P Request for examination filed
ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): CH FR GB IT NL SE

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19821116

Year of fee payment: 4

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19821130

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19821130

Year of fee payment: 4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19821231

Year of fee payment: 4

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19831130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19840601

GBPC Gb: european patent ceased through non-payment of renewal fee
NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19840731

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881118

EUG Se: european patent has lapsed

Ref document number: 79104773.1

Effective date: 19850607

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT