EP0077011A2 - Interrupteur à bouton-poussoir notamment interrupteur à touche - Google Patents

Interrupteur à bouton-poussoir notamment interrupteur à touche Download PDF

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Publication number
EP0077011A2
EP0077011A2 EP82109221A EP82109221A EP0077011A2 EP 0077011 A2 EP0077011 A2 EP 0077011A2 EP 82109221 A EP82109221 A EP 82109221A EP 82109221 A EP82109221 A EP 82109221A EP 0077011 A2 EP0077011 A2 EP 0077011A2
Authority
EP
European Patent Office
Prior art keywords
contact
spring
contact spring
switching plunger
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.)
Withdrawn
Application number
EP82109221A
Other languages
German (de)
English (en)
Other versions
EP0077011A3 (fr
Inventor
Reinhard Ludwig Fricke
Klaus Hinze
Manfred Klaus Otto Huth
Klaus Bernd Wisskirchen
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.)
TDK Micronas GmbH
Rudolph Schadow GmbH
ITT Inc
Original Assignee
Deutsche ITT Industries GmbH
Rudolph Schadow GmbH
ITT Industries Inc
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 Deutsche ITT Industries GmbH, Rudolph Schadow GmbH, ITT Industries Inc filed Critical Deutsche ITT Industries GmbH
Publication of EP0077011A2 publication Critical patent/EP0077011A2/fr
Publication of EP0077011A3 publication Critical patent/EP0077011A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2025—Bridging contacts comprising two-parallel bridges

Definitions

  • the present invention relates to a push-button switch, in particular push-button switch, with a rod-shaped switching plunger which can be displaced in the axial direction against the force of a compression or snap spring, the end of which carries a contact spring with contact arms projecting from both sides, the contact arms at least in the end region as a longitudinal slot Double contacts are formed and these can interact with fixed contacts arranged at right angles to the slot direction and consisting at least in the contact area of flat material with a roller-shaped rounded contact path.
  • Such a pushbutton switch is known, for example, from DE-OS 2 942 720.
  • the contact spring is designed as a leaf spring running in one plane and the contact surfaces are also flat. Hi.er thereby you get a large contact at the contact point with a full circulation.
  • this causes a relatively low contact pressure, which is disadvantageous in particular in the case of pushbutton switches in which there should only be a small push of a button.
  • the contact spring or the fixed contact or both are not installed exactly in the same plane for any reason, the edge of the contact springs comes into frictional contact with the contact track, so that a very high contact pressure is achieved, but this is exposed to very high wear , because the edges are very sharp.
  • a switching plunger 11 made of a suitable plastic.
  • the latter has a disk-shaped lower end 12 with a tab-shaped extension 13 projecting downwards (FIGS. 11 and 12).
  • a lancet-like, leaf-shaped contact spring 14 is pushed onto this by means of a central recess 15 which is adapted to the cross section of the extension 13 and is fixed in its position by mechanical, plastic and / or thermoplastic deformation of the extension 13.
  • the outer edge 16 of the switching plunger end 12 forms a lower axle bearing with the inner surfaces 17 of the webs 10.
  • the insertion depth of the switching plunger 11 is limited by its bearing surface 18 and by lateral support platforms 19 on the bottom 9 of the housing 1. The latter are designed and arranged such that the extension 13 of the switching plunger 11 does not touch the electrodes 9 and the contact spring 14 can be moved between them .
  • the switching plunger 11 is provided with a bore 20 running in the direction of the contact spring 14.
  • a spiral spring 21 can be inserted through the latter, the projecting ends 22 of which are bent downwards when the switching plunger 11 is inserted into the housing 1 and inserted into grooves 23 in the housing 1.
  • the grooves 23 are provided in the corners 2 and 3 adjacent corners 24. Its bottom is inclined upwards from the outside inwards.
  • lugs 30 press with their cover 31, which extends obliquely upwards from the outside inwards, onto the ends 22 of the spiral spring 21 and clamp them in the arched position.
  • the desired snap action of the pushbutton switch or the switching plunger 11 is thereby achieved. In the rest position, the switching plunger 11 is pressed upwards, whereby it can abut against the inside of the cover with a bead 32.
  • the central axis-shaped part 33 of the switching plunger 11 forms an upper bearing with an annular recess 34 in the cover 25.
  • the contact arms 35 of the contact spring 14 projecting from the fastening point (attachment 13) on both sides are provided with a longitudinal slot 36, so that a double contact is made possible for each contact arm.
  • the contact area 37 of the contact spring 14 can be provided with a special contact layer. According to the invention, it is provided with an embossing 38 with a linear curvature extending in the slot direction, the convex surface of which, when installed, lies opposite the associated fixed contact 5. This ensures that the fixed contact 5 can also be oblique to the plane of the contact spring 14 and still does not press a sharp side edge thereof onto the contact track 8 (FIGS. 5 and 6).
  • the arrangement is selected such that the switching plunger 11 can be actuated in the upper stroke, ie that it can be moved further axially downwards from the moment of contact with the contact.
  • the upper stroke is so great that the ends 39 of the contact arms 35 can be deflected by about 10 - 35% of the length of the free arm length 40 of the contact spring 14 due to the deflection of the contact spring 14.
  • the point of contact P of the contact area 37 is displaced further outward and the point of contact of the contact area 37 on the contact path 8 also moves by the contact angle ⁇ .
  • the curvature of the contact areas 37 ensures that a punctiform contact is achieved over the entire contact path section, which is covered by the contact angle OC. This results in a high contact pressure and thus a low transition resistance over the entire contact area and also a self-cleaning of the contacts.
  • the contact surface 18 of the switching plunger end 12 is curved in the direction of the deflection of the contact spring 14.
  • the curvature preferably has at least approximately such a shape as the contact spring 14 can assume when the maximum deflection occurs.
  • the radius of curvature expediently has about 1.2 to 2 times the size of a free contact arm length 40.
  • the length of the contact surface in the direction of the contact spring axis is preferably about 20-40% of the length of the contact spring 14.
  • a useful development of the invention is that the bearings of the switching plunger 11 in the housing 1 and in the cover 25 are circular in cross section and the exact angular position of the contact spring 14 is arranged by the relatively long and above the contact spring 14 in the same, preferably radial direction how the contact arms 35 reached protruding sliding fingers 41.
  • the ends 42 of each slide in a vertical guide groove 43 of the housing 1 or a housing part, in particular the cover 25.
  • the guide grooves 43 are in the diagonally opposite corners 44 corresponding to the corners 2, 3 of the housing 1, 45 of the lid 25 is provided. This measure achieves a high angular accuracy with the usual manufacturing tolerance of the plastic injection molded parts.
  • the switching plunger itself were to be square, for example, then certain minimum distances or Minimum tolerances are observed to ensure easy movement and to avoid tilting. Even with the small size of the switches for keyboards for computers, office machines, etc., this can lead to an impermissibly large angular rotation of the key and, above all, the contact spring 14. If, on the other hand, the angle fixation is carried out according to the invention at a point lying radially further outward, an angular accuracy that is two to four times higher can be achieved with the same tolerance.
  • the arrangement of the guide grooves 43 in the cover 25 allows the switch structure to be kept particularly small in the stroke direction.
  • the sliding fingers 40 can also serve to limit the stroke of the switching plunger 11 or the button up and / or down.

Landscapes

  • Push-Button Switches (AREA)
EP82109221A 1981-10-09 1982-10-06 Interrupteur à bouton-poussoir notamment interrupteur à touche Withdrawn EP0077011A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3140199A DE3140199C2 (de) 1981-10-09 1981-10-09 Drucktastenschalter, insbesondere Tastschalter mit geringem Tastendruck für Eingabetastaturen
DE3140199 1981-10-09

Publications (2)

Publication Number Publication Date
EP0077011A2 true EP0077011A2 (fr) 1983-04-20
EP0077011A3 EP0077011A3 (fr) 1985-05-15

Family

ID=6143771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109221A Withdrawn EP0077011A3 (fr) 1981-10-09 1982-10-06 Interrupteur à bouton-poussoir notamment interrupteur à touche

Country Status (5)

Country Link
US (1) US4514609A (fr)
EP (1) EP0077011A3 (fr)
JP (1) JPS58108618A (fr)
CA (1) CA1191180A (fr)
DE (1) DE3140199C2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0309741A1 (fr) * 1987-09-30 1989-04-05 Oerlikon-Contraves AG Interrupteur électrique à bouton-pousoir
FR2629943B1 (fr) * 1988-04-06 1994-04-15 Itt Composants Instruments Interrupteur electrique a effet tactile
US4839475A (en) * 1988-04-29 1989-06-13 Limitorque Corporation Modular switch assembly having wiping contacts
JP2561697Y2 (ja) * 1992-08-28 1998-02-04 アプルス株式会社 ランセット
JP3144718B2 (ja) * 1992-10-26 2001-03-12 アプルス株式会社 採血デバイス
US5628765A (en) * 1994-11-29 1997-05-13 Apls Co., Ltd. Lancet assembly
DE69627288T2 (de) * 1995-07-28 2003-12-04 Apls Co. Ltd., Okayama Vorrichtung zum einstellen der eindringtiefe einer lanzette
US6064016A (en) * 1998-08-04 2000-05-16 Itt Manufacturing Enterprises, Inc. Wiper switch terminal and contact
TWM300861U (en) * 2006-03-20 2006-11-11 Hon Hai Prec Ind Co Ltd Slide switch
JP6432487B2 (ja) * 2015-11-06 2018-12-05 オムロン株式会社 スイッチ

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1699645A (en) * 1925-10-29 1929-01-22 Roach Appleton Mfg Company Switch
BE449087A (fr) * 1942-02-10
US2661408A (en) * 1946-03-09 1953-12-01 United Carr Fastener Corp Electrical switch
DE1003318B (de) * 1955-04-23 1957-02-28 Maecker Elan Schaltelemente Schubschalter
US3164708A (en) * 1960-10-27 1965-01-05 Automatic Elect Lab Precious metal tip for strowger switch wipers
US3196230A (en) * 1962-09-19 1965-07-20 Cts Corp Snap action pull-push type electric switch
US3336455A (en) * 1965-05-05 1967-08-15 Square D Co Push button operated switch structure
US3319022A (en) * 1966-05-04 1967-05-09 American Mach & Foundry Snap switch having an integral over-center snap spring blade
US3591747A (en) * 1969-12-29 1971-07-06 Arrow Hart Inc Lever operated switch with tiltable contact actuator and flexible contacts
US3668347A (en) * 1970-01-19 1972-06-06 Robertshaw Controls Co Snap acting electrical switch construction having reset means
DE2022178A1 (de) * 1970-05-06 1971-11-18 Bbc Brown Boveri & Cie Kontaktanordnung mit Schaltbruecke
US3624332A (en) * 1970-09-09 1971-11-30 Oak Electro Netics Corp Snap switch
US3736395A (en) * 1971-02-03 1973-05-29 E Miller Direct-action switch
DE7220520U (de) * 1972-05-31 1974-10-10 Siemens Ag Elektrischer Schaltkontakt
US3902032A (en) * 1974-06-07 1975-08-26 Illinois Tool Works Electrical switch with improved contact structure
US4006322A (en) * 1975-09-22 1977-02-01 Allis-Chalmers Corporation Auxiliary interlock switch with interchangeable and reversible chisel-shaped contacts and spring biasing mechanism
DE2601206A1 (de) * 1976-01-14 1977-07-21 Priesemuth W Bremslichtschalter
US4188518A (en) * 1976-06-16 1980-02-12 Isostat Miniature electrical push button contactor
US4260862A (en) * 1979-02-21 1981-04-07 Texas Instruments Incorporated Condition responsive apparatus having an improved motion transfer member
DE2942720C2 (de) * 1979-10-23 1982-05-27 Standard Elektrik Lorenz Ag, 7000 Stuttgart Drucktaste mit Schnappwirkung

Also Published As

Publication number Publication date
JPS58108618A (ja) 1983-06-28
DE3140199A1 (de) 1983-04-28
CA1191180A (fr) 1985-07-30
DE3140199C2 (de) 1984-03-22
EP0077011A3 (fr) 1985-05-15
US4514609A (en) 1985-04-30

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Legal Events

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

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Designated state(s): CH DE FR GB IT LI

PUAL Search report despatched

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18D Application deemed to be withdrawn

Effective date: 19860116

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FRICKE, REINHARD LUDWIG

Inventor name: WISSKIRCHEN, KLAUS BERND

Inventor name: HINZE, KLAUS

Inventor name: HUTH, MANFRED KLAUS OTTO