EP0562389A1 - Elément d'allongement de la course pour des claviers à touches flexibles - Google Patents

Elément d'allongement de la course pour des claviers à touches flexibles Download PDF

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Publication number
EP0562389A1
EP0562389A1 EP93104023A EP93104023A EP0562389A1 EP 0562389 A1 EP0562389 A1 EP 0562389A1 EP 93104023 A EP93104023 A EP 93104023A EP 93104023 A EP93104023 A EP 93104023A EP 0562389 A1 EP0562389 A1 EP 0562389A1
Authority
EP
European Patent Office
Prior art keywords
lever
extension element
base
element according
stroke extension
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.)
Ceased
Application number
EP93104023A
Other languages
German (de)
English (en)
Inventor
Uwe Seiler
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.)
SCHURTER GmbH
Original Assignee
SCHURTER 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 SCHURTER GmbH filed Critical SCHURTER GmbH
Publication of EP0562389A1 publication Critical patent/EP0562389A1/fr
Ceased 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
    • H01H13/702—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 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/705—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 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2237/00—Mechanism between key and laykey
    • H01H2237/004—Cantilever

Definitions

  • the invention relates to a stroke extension element for membrane keyboards with a housing-like base, in which a lever is arranged and integrally formed on the base, the lever being pivotable by means of an actuator, preferably with the interposition of a compression spring, and by means of a switching cam arranged on the lever, the two to be switched Films short out.
  • Membrane keyboards are known.
  • An electrically non-conductive layer is arranged between two electrically conductive foils. When pressure is exerted on these foils at the foil switching point, the electrically conductive foils are brought into contact with one another and the corresponding circuit is thus closed.
  • special switches for the low voltage range i.e. up to 65 V, with which a stroke extension is achieved.
  • a push button switch for membrane keyboards of the type specified in which a pivotable lever is arranged in a housing, which is integrally formed with the housing.
  • the switch cam of the lever is connected to the housing via a kind of tongue. With the interposition of a compression spring, the switch cam can be pivoted downwards by means of an actuation button, so that the switch cam closes the two films to be switched.
  • the lever is integrally formed on the housing, but it has a poor tripping characteristic.
  • the object of the invention is to create a stroke extension element for membrane keyboards with an improved lever.
  • the invention proposes that the base has a torsion bar integrally formed on it, on which the lever is integrally formed essentially perpendicular to it.
  • a stroke extension element for membrane keyboards designed according to this technical teaching has the advantage that the lever is connected to the base by the torsion bar, the entire structure consisting of the base, the torsion bar and the lever being able to be injection-molded in a single tool.
  • the protruding or cantilevered arrangement of the lever on the torsion bar is such that there is a twisting of the torsion bar when the lever is loaded. If the lever is relieved by the actuator again, it is brought back to its starting position due to the tension in the torsion bar and the contact between the two foils is interrupted again.
  • the torsion bar with its lever gives the stroke extension element a very good release characteristic with high reproducibility.
  • the stroke extension element according to the invention for membrane keyboards combines the advantages of a membrane keyboard with the ergonomics and tactility of a long stroke button in a technically simple and reliable manner.
  • the torsion bar suggests that it is fixed with its two ends to the base.
  • the torsion bar thus forms a kind of connection or bridge between corresponding base elements, the torsion bar being integrally formed with its two ends on the corresponding elements of the base, as has already been described above.
  • This arrangement of the torsion bar gives it great stability and, in particular, reproducibility of the movement of the lever when it is loaded by the button.
  • the lever is connected to the base by the torsion bar or by the two torsion bars, provided that the connections to the base arranged on both sides of the lever are each considered to be a torsion bar.
  • the lever is preferably integrally formed on the torsion bar in the middle thereof. This leads to even tension within the torsion bar.
  • torsion bar suggests that it is arranged in the edge region of the base and that the lever extends into the interior of the base.
  • the torsion bar is thus located in the region of the side wall of the housing-like base, and preferably in parallel to this housing wall.
  • torsion bar has an essentially round cross section.
  • the torsion bar has a non-circular cross-section, for example an oval or a square or rectangular cross-section.
  • the base and the lever are formed by an integral plastic injection molded part.
  • the base and the lever can thus be created in an extremely technically simple manner by means of a single injection process.
  • the lever is essentially rigid and can be pivoted in the molding area on the base.
  • the lever is thus a rigid structure which is only movably arranged in the area where it is formed on the base.
  • the lever (possibly in addition to the pivotability in the molding area on the base) is flexible.
  • lever has at its free end a receiving pin for a helical compression spring, on which in turn the actuator is supported. This represents a simple technical possibility for arranging the compression spring between the actuator and the lever, with a safe guidance being ensured in particular.
  • a further development of the invention proposes that the switch cam is arranged in the area between the molding area of the lever on the base and the engagement area of the actuator on the lever.
  • the area of engagement of the actuator on the lever preferably has one greater distance to the axis of the torsion bar as the fulcrum of the lever than the switch cam.
  • the compression spring is dimensioned such that the films to be switched are short-circuited before the actuator reaches the lower end position. This provides a corresponding wake of the stroke extension element, which improves ergonomics and tactility.
  • a return spring is provided for the lever. This return spring, which is supported between the lever and the base, ensures that the lever returns to its starting position after relieving the actuator and supports the return tendency that is built up by pivoting the lever anyway.
  • the actuator has a receptacle, in particular a cross receptacle for a probe cap.
  • the inclusion has the advantage that different probe caps can be adapted as required.
  • the stroke extension element 1 in the manner of a switch or push button for membrane keyboards, has a housing-like base 2, as is shown alone in FIG. 3.
  • This pedestal 2 has on the underside a pin 3, by means of which it is fastened to a carrier plate 4 by riveting, as can be seen in FIGS. 2 and 4.
  • the base 2 also has a torsion bar 5 with a round cross section in the region of one side.
  • the base 2 has two extensions 6 which are connected to one another by the torsion bar 5.
  • a lever 7 In the middle of the torsion bar 5 there is a lever 7 which projects into the interior of the housing-like base 2. This lever 7 has on the underside approximately in the middle a switching cam 8 and on the top in the area of the free end a receiving pin 9.
  • the described base 2 in particular with the torsion bar 5 and the lever 7, represents a one-piece injection molded plastic part, i.e. the base 2, as shown in Fig. 3, is produced by a single injection molding process.
  • the base 2 is fastened to the carrier plate 4 in the manner described, the two foils 10 made of electrically conductive material resting on this carrier plate 4 with a non-conductive layer interposed therebetween.
  • an actuator 11 This is supported on a helical compression spring 12, which in turn is attached to the mounting pin 9 of the lever 7.
  • the movement of the actuator 11 is limited by a nose 13 of the base 2.
  • a key cap 15 is interchangeably fixed in a receptacle 14 of the actuator 11.
  • the stroke extension element 1 works as follows: The basic position of the stroke extension element 1 is shown in FIG. 2. It can be seen that the actuator 11 with its probe cap 15 is in its upper position due to the action of the compression spring 12. In this, the lever 7 is in a horizontal position in which the two foils 10 are not short-circuited. Fig. 3 shows that the lever 7 is in a bias away from the films 10 bias. If you remove the actuator 11, the lever 7 pivots a little upwards, which is indicated in Fig. 3 by the two dash-dotted lines.
  • the actuator 11 is pressed down over the key cap 15. This situation is shown in Fig. 4.
  • the compression spring 12 is compressed and in doing so transmits the force to the lever 7.
  • the two foils 10 are short-circuited and thus the desired one Contact triggered.
  • the lever 7 is reset by the tension built up in the torsion bar 5 and thus an interruption of the contact in the two foils 10.
  • the actuator 11 is held in the upper end position by the compression spring 12.
  • the lever 7 is held in the installed state in the manner described under a slight pretension.
  • the compression spring 12 is dimensioned such that the foils 10 are short-circuited before the actuator 11 reaches the lower end position.
  • the stroke extension element 1 according to the invention is distinguished by its structural simplicity. Only three parts are necessary, namely the base 2, the actuator 11 and the compression spring 12, the base 2 with its torsion bar 5 and its lever 7 forming an integral molded part. This results in less assembly effort and minimal assembly tolerances. Overall, the advantages of a membrane keyboard are combined with the ergonomics and tactility of a long-stroke button with the stroke extension element 1 according to the invention.

Landscapes

  • Push-Button Switches (AREA)
EP93104023A 1992-03-24 1993-03-12 Elément d'allongement de la course pour des claviers à touches flexibles Ceased EP0562389A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4209437 1992-03-24
DE19924209437 DE4209437A1 (de) 1992-03-24 1992-03-24 Hubverlängerungselement für Folientastaturen

Publications (1)

Publication Number Publication Date
EP0562389A1 true EP0562389A1 (fr) 1993-09-29

Family

ID=6454819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93104023A Ceased EP0562389A1 (fr) 1992-03-24 1993-03-12 Elément d'allongement de la course pour des claviers à touches flexibles

Country Status (2)

Country Link
EP (1) EP0562389A1 (fr)
DE (1) DE4209437A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3024485A1 (fr) * 2014-08-04 2016-02-05 Filec Dispositif electronique de commande pour ouvrant de vehicule automobile et poignee d'ouvrant correspondante
CN106298323A (zh) * 2016-08-26 2017-01-04 江门市江海区柏健电器制造有限公司 一种圆形琴键开关壳体

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506509C2 (de) * 1995-02-24 1996-12-05 Preh Elektro Feinmechanik Tastenfeld für Verkaufs- und Registrierkassen
DE19627294A1 (de) * 1996-07-06 1998-01-08 Abb Patent Gmbh Wipptaster
DE102010027799A1 (de) * 2010-04-15 2011-10-20 BSH Bosch und Siemens Hausgeräte GmbH Bedienvorrichtung für ein Hausgerät sowie Hausgerät mit einer Bedienvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2165679C3 (de) * 1971-01-04 1978-05-11 International Business Machines Corp., Armonk, N.Y. (V.St.A.) Betätigungsvorrichtung, insbesondere für elektrischen Druckkontakt
DE3418931A1 (de) * 1983-05-21 1984-11-22 Alps Electric Co., Ltd., Tokio/Tokyo Drucktastenschalter
EP0157037A2 (fr) * 1984-03-29 1985-10-09 Bowmar Instrument Corporation Commutateur à bouton poussoir à longue course

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59186214A (ja) * 1983-04-08 1984-10-23 富士通株式会社 押釦スイツチ
DE3433604A1 (de) * 1984-09-13 1986-03-20 Brown, Boveri & Cie Ag, 6800 Mannheim Betaetigungsvorrichtung fuer elektrische schalter
US4582967A (en) * 1984-10-22 1986-04-15 Tec, Inc. Key switch assembly
JPS61140009A (ja) * 1984-12-12 1986-06-27 信越ポリマ−株式会社 押釦スイツチ
SU1332401A1 (ru) * 1985-06-07 1987-08-23 Предприятие П/Я М-5339 Коммутационное устройство
DE3928650A1 (de) * 1989-08-30 1991-03-28 Stocko Metallwarenfab Henkels Elektrischer druckschalter
US5057657A (en) * 1990-07-23 1991-10-15 Vedran Skulic Electrical switch actuator mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2165679C3 (de) * 1971-01-04 1978-05-11 International Business Machines Corp., Armonk, N.Y. (V.St.A.) Betätigungsvorrichtung, insbesondere für elektrischen Druckkontakt
DE3418931A1 (de) * 1983-05-21 1984-11-22 Alps Electric Co., Ltd., Tokio/Tokyo Drucktastenschalter
EP0157037A2 (fr) * 1984-03-29 1985-10-09 Bowmar Instrument Corporation Commutateur à bouton poussoir à longue course

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3024485A1 (fr) * 2014-08-04 2016-02-05 Filec Dispositif electronique de commande pour ouvrant de vehicule automobile et poignee d'ouvrant correspondante
CN106298323A (zh) * 2016-08-26 2017-01-04 江门市江海区柏健电器制造有限公司 一种圆形琴键开关壳体

Also Published As

Publication number Publication date
DE4209437A1 (de) 1993-09-30

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