EP0614204A2 - Calotte d'interrupteur pour bouton-poussoir - Google Patents

Calotte d'interrupteur pour bouton-poussoir Download PDF

Info

Publication number
EP0614204A2
EP0614204A2 EP94102939A EP94102939A EP0614204A2 EP 0614204 A2 EP0614204 A2 EP 0614204A2 EP 94102939 A EP94102939 A EP 94102939A EP 94102939 A EP94102939 A EP 94102939A EP 0614204 A2 EP0614204 A2 EP 0614204A2
Authority
EP
European Patent Office
Prior art keywords
base
cover
switch cap
switch
cap 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
EP94102939A
Other languages
German (de)
English (en)
Other versions
EP0614204B1 (fr
EP0614204A3 (fr
Inventor
Ekkehard Sachs
Kai-Uwe Marquardt
Reinhold Wölki
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.)
Marquardt GmbH
Original Assignee
Marquardt 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 Marquardt GmbH filed Critical Marquardt GmbH
Publication of EP0614204A2 publication Critical patent/EP0614204A2/fr
Publication of EP0614204A3 publication Critical patent/EP0614204A3/fr
Application granted granted Critical
Publication of EP0614204B1 publication Critical patent/EP0614204B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H13/7006—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 comprising a separate movable contact element for each switch site, all other elements being integrated in layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00—Tactile feedback
    • H01H2215/004—Collapsible dome or bubble
    • H01H2215/012—Positioning of individual dome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00—Tactile feedback
    • H01H2215/004—Collapsible dome or bubble
    • H01H2215/02—Reversed domes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/064—Eliminating tolerances

Definitions

  • the invention relates to a switch cap according to the preamble of patent claim 1 or 2.
  • Switch caps made of a plastic injection molding compound or the like are used in pushbutton switches as an actuating element and reset element for the pushbutton.
  • a switch cap for a push button switch provided with a push button which has a base base, a narrower cover than the base base and a flexible thin-walled membrane connecting the base base and the cover.
  • a contact surface for bridging fixed contacts is attached to the cover on its surface facing the base base or on the base base on its surface facing the cover.
  • the invention has for its object to further develop a switch cap of the type mentioned in such a way that an independent compensation of installation-related tolerances on the switch cap is possible.
  • a push-button switch equipped with the switch cap according to the invention can be produced functionally reliably without rejects, since tolerances occurring due to the installation position of the switch cap or push button do not affect the actual stroke of the switch cap. It is further advantageous that an arbitrarily large additional overstroke can be achieved by extending the advance path.
  • the height of the membrane and the base or cover must have certain proportions, so that a snap action corresponding to the desired specifications occurs when the switch cap is actuated and a certain tactile feeling for the user during the switching operation is present. For this reason, any stroke lengths cannot always be realized constructively with conventional switch caps.
  • the resilient approach to the switch cap according to the invention can be designed in any size, so that any desired lead and thus stroke can be achieved.
  • a pushbutton switch 1 can be seen in FIG. 1 and consists of a pushbutton 2, which is only shown schematically and is generally provided with an installation mimic (not shown), and a switch cap 3.
  • the switch cap 3 has a base base 4, which is on its underside Has insertion feet 5 for insertion into a side plate 6.
  • the switch cap 2 has a cover 7 which is narrower than the base base 4 and on whose surface facing the base base 4 there is an attachment 8, on which in turn a contact surface 9 is applied.
  • the contact surface 9 can consist of a conductive layer of carbon lacquer, silver lacquer, gold lacquer or the like.
  • the base base 4 and the cover 7 are connected to one another via a flexible thin-walled membrane 10.
  • the switch cap 3 is frustoconical, the base base being a rectangular basic cross section 4 'or a circular one May have basic cross section 4 ''.
  • the cover 7 is substantially cylindrical with a blind hole 23 and the membrane 10 as a truncated cone surface.
  • the approach 8 is in turn cylindrical.
  • the base base 4 and the cover 7 are of relatively rigid and rigid design because of the solid shape.
  • the flexible membrane 10 is very elastic due to its thin walls.
  • a force acts on the switch cap 3, which acts as an actuating member, a lifting movement for actuating the switch cap 3 taking place through the cover 7 in the direction 24 to the base base 4.
  • the contact surface 9 on the attachment 8 interacts with the fixed contacts 11 ', 11' 'located on the printed circuit board 6, the contact surface 9 bridging the two fixed contacts 11', 11 '' so that the electrical contact is closed.
  • the switch cap 3 acts as a restoring element due to the spring force of the elastic membrane 10 and the cover 7 returns to its original position.
  • the switch cap 3 consists of a plastic injection molding compound or the like, preferably a thermoplastic elastomer, and is produced by the injection molding process.
  • a so-called block copolymer which consists of a hard crystalline segment made of polybutylene terephthalate and a soft amorphous segment based on long-chain polyether glycols, has proven to be particularly suitable.
  • Such a plastic injection molding compound is sold under the name "HYTREL" by the Du Pont company.
  • the stroke h which is structurally predetermined by the switch cap 3 is, as can be seen from FIG. 1, by the distance of the contact surface 9 from the fixed contacts 11 ', 11''in unactuated state determined. Due to tolerances in the installation position of the push button 2 and the switch cap 3 in the push button switch, however, it can happen that the push button 2 already acts on the cover 7 in the unactuated state, so that it has already covered part of its stroke movement. However, this undesirably shortens the total stroke h available. To compensate for such tolerances, as can be seen in FIG. 3, the cover 7 has an extension 12 on the surface facing away from the base base 4, which is assigned to the push button 2, which is designed to be resilient in the direction 24 of the lifting movement.
  • the push button 2 does not lie directly on the cover 7 but on this attachment 12. If tolerances now occur between the installation position of the push button 2 and the switch cap 3, only the attachment 12 is deformed when the push button 2 is not actuated, so that the cover 7 retains its original position. In particular, deformation of the membrane 10 in the unactuated state is thus effectively prevented.
  • Fig. 8 three pushbutton switches 1a, 1b, 1c can be seen in a schematic diagram with different and thus tolerant installation position in the unactuated state.
  • the pushbuttons 2a, 2b, 2c deform the lugs 12a, 12b, 12c to different degrees in the direction of the lifting movement, while the position of the contact surfaces 9a, 9b, 9c of the switch caps 3a, 3b, 3c and thus also the The size of the stroke h of the switch caps 3a, 3b, 3c has not changed.
  • the attachment 12 may deform further until the push button 2 rests on the cover 7 (see FIG. 3) and only then does the cover 7 carry out its lifting movement. Can be seen so that the stroke h specified by the dimensioning of the switch cap 3 (see also FIG. 1) is not shortened. If necessary, the entire stroke is extended by the additional deformation movement of the extension 12. However, this is of additional advantage, since it increases the travel distance up to the actual switching point at which the contact surface 9 bridges the fixed contacts 11 ', 11'', which is otherwise not at all due to design restrictions in the dimensioning of the switch cap 3 Cases is achievable.
  • Fig. 5 the force-displacement diagram for the switch cap 3 is shown schematically. If an actuating force F is exerted on the push button 2, the attachment 12 is first deformed, the force F required increasing approximately linearly in accordance with the cam branch 25 as a function of the actuating path s due to its spring action. With a certain actuation path s1, the shoulder 12 is completely compressed and the cover 7 is now moved while deforming the membrane 10, the actuation force F increasing very much in accordance with the curve branch 26 up to the actuation path s2. During the actuation path s2, the membrane 10 snaps, so that the force F drops to the actuation path s3 in accordance with the curve branch 27. There, the contact surface 9 bridges the fixed contacts 11 ', 11' ', the contact surface 9 resting on the printed circuit board 6, so that the actuating force F rises very steeply with further actuation, as is shown with the curved branch 28.
  • the extension 12 can be designed such that it has a lower spring force than that caused by the elasticity of the membrane 10 is caused. This is preferably done by making a recess 13 in the Approach 12 reached, as shown in Fig. 3. If the cover 7 has a cylindrical shape, it makes sense to make the extension 12 circular and the recess 13 also continuous in a circular shape. In this case, the projection 12 can be integrally molded onto the cover 7 when the switch cap 3 is manufactured.
  • the cross section of the recess 13 can be triangular, as shown in FIG. 6, or also trapezoidal according to FIG. 3. Such an approach 12 also has approximately the shape of a plate spring.
  • FIGS. 4 and 8 A switch cap 15 according to a further exemplary embodiment is shown in FIGS. 4, 6, 7 and 8. Here, the switch cap 15 is turned upside down compared to that of FIG. 1. Accordingly, the cover 16 is arranged with its lower end face on the printed circuit board 17 (see FIG. 4), while the base base 18, which is wider than the cover 16, is acted upon by an actuating force by means of a pushbutton (not shown).
  • the switch cap 15 has a flexible thin-walled membrane 19 connecting the base base 18 and the cover 16.
  • the base base 18 has on its surface facing the cover 16 a contact surface 20 for bridging fixed contacts 21 ', 21' 'located on the printed circuit board 17. The lifting movement for actuating the switch cap 15 then takes place through the base base 18 in the direction 24 to the cover 16.
  • the base base 18 has an extension 12 on the surface facing away from the cover 16, which extension is designed to be resilient in the direction 24 of the lifting movement.
  • the further one Embodiment of this approach 12, in particular the provision of cutouts 13, can again be carried out like that of the first exemplary embodiment.
  • the switch cap 3 according to the first exemplary embodiment in FIG. 1 has insertion feet 5 for attachment to the printed circuit board 6. With the switch cap 15 of the further exemplary embodiment, such an attachment is not possible.
  • a fastening part 30 can be arranged on the cover 16 on the surface facing away from the base base 18, which is designed such that it is in a recess 31 as the carrier part serving circuit board 17 can be used latching.
  • the fastening part 30 is preferably arranged centrally and in a form-fitting manner in the recess 31.
  • the fastening part 30 is a separate part in the form of a pin, which has a shaft 32 with a round cross section and a head 33 arranged on the side opposite the cover 16.
  • the recess 31 in the circuit board 17 is further formed by a through hole.
  • the shaft 32 is cross-sectionally adapted to the recess 31, while the head 33 is somewhat larger in cross-section than the recess 31.
  • the fastening part 30 is now inserted into the recess 31 such that the head 33 rests on the underside 34 of the printed circuit board 17.
  • the fastening part 30 has at its end facing away from the head 33 a fastening knob 35.
  • the fastening part 30 is inserted from the side facing the base base 18 into an opening 36 of the cover 16 (see FIG. 4) in such a way that the fastening part 30 is inserted through the Fastening button 35 is held on the lid 16.
  • a hard plastic for example a polycarbonate, polyamide, polyacetal, polyester, polybutylene terephthalate or the like. It is also possible to produce the fastening part 30 from metal.
  • the fastening part 30 can, as is also shown in FIG. 9, be designed to be elastically resilient. This is achieved in that the shaft 32 is provided with a slot 37 which also passes through the head 33. When the shaft 32 is introduced into the cutout 31, the cross section of the head 33 can be reduced due to the slot 37, so that it can be easily passed through the cutout 31. As soon as the head 33 has reached the underside 34 of the printed circuit board 17, the head 33 springs apart again to its original size and the fastening part 30 is inserted into the recess 31 in a latching manner.
  • the fastening part 30 is expediently produced simultaneously with a conveyor belt 38 in the injection molding process, as can be seen in more detail in FIG. 10.
  • Two fastening parts 30 located on the conveyor belt 38 have the same distance d from one another.
  • a holding part 39 is preferably injection molded between the fastening button 35 and the conveyor belt 38, a predetermined breaking point 40 being located at the transition between the fastening button 35 and the holding part 39.
  • the switch caps 15 with the fastening part 30 inserted are broken off at the predetermined breaking point 40 by the holding part 39 and can then be inserted later into the printed circuit board 17 (see FIG. 9).
  • the switch cap 3 provided with an extension 12 according to FIG. 1 can also be used in keyboard arrangements with a plurality of individual keys. For this purpose, it is then appropriate to connect the individual switch caps 3 to one another at their base base 4 to form a switch mat, this connection in particular being able to take place during the manufacture of the switch mat by a common injection process.

Landscapes

  • Push-Button Switches (AREA)
EP94102939A 1993-03-02 1994-02-26 Calotte d'interrupteur pour bouton-poussoir Expired - Lifetime EP0614204B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4306430 1993-03-02
DE4306430 1993-03-02
DE4342966A DE4342966A1 (de) 1993-03-02 1993-12-16 Schalterkappe für Drucktastenschalter
DE4342966 1993-12-16

Publications (3)

Publication Number Publication Date
EP0614204A2 true EP0614204A2 (fr) 1994-09-07
EP0614204A3 EP0614204A3 (fr) 1994-12-14
EP0614204B1 EP0614204B1 (fr) 1999-04-14

Family

ID=25923572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102939A Expired - Lifetime EP0614204B1 (fr) 1993-03-02 1994-02-26 Calotte d'interrupteur pour bouton-poussoir

Country Status (3)

Country Link
EP (1) EP0614204B1 (fr)
DE (2) DE4342966A1 (fr)
ES (1) ES2132268T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9412474U1 (de) * 1994-08-03 1994-12-08 AutoAir Klimaanlagen GmbH, 47574 Goch Klimaschaltereinheit
CN109456577A (zh) * 2017-09-06 2019-03-12 浙江台州多邦高分子材料科技有限公司 一种高分子弹性体弹簧

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2146234C1 (ru) * 1997-09-23 2000-03-10 Павлов Вячеслав Фролович Способ получения пористых стекломатериалов из нефелиновых шламов
DE10025688B4 (de) * 2000-05-24 2010-07-29 Leopold Kostal Gmbh & Co. Kg Einrichtung zur Betätigung von Funktionselementen
DE10037142B4 (de) * 2000-07-29 2005-04-07 Leopold Kostal Gmbh & Co Kg Elektrisches Schaltelement
JP4039030B2 (ja) * 2001-10-29 2008-01-30 松下電器産業株式会社 プッシュオンスイッチ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH645205A5 (de) * 1978-12-01 1984-09-14 Maag Gummi Schaltmatte.
JPS58117615A (ja) * 1981-12-29 1983-07-13 信越ポリマ−株式会社 押釦スイツチ用押圧制御部材
DE3335582A1 (de) * 1983-09-30 1985-04-18 Siemens AG, 1000 Berlin und 8000 München Tastatur fuer fernsprechgeraete
JPH04137414A (ja) * 1990-09-28 1992-05-12 Alps Electric Co Ltd 押釦スイツチのゴム接点
DE4112754C2 (de) * 1991-04-19 1999-06-02 Marquardt Gmbh Drucktastenschalter
DE9108530U1 (de) * 1991-07-11 1991-11-28 Chen, Pao-Chin, Taipeh/T'ai-pei Tastatur für einen Computer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9412474U1 (de) * 1994-08-03 1994-12-08 AutoAir Klimaanlagen GmbH, 47574 Goch Klimaschaltereinheit
CN109456577A (zh) * 2017-09-06 2019-03-12 浙江台州多邦高分子材料科技有限公司 一种高分子弹性体弹簧

Also Published As

Publication number Publication date
DE59408099D1 (de) 1999-05-20
EP0614204B1 (fr) 1999-04-14
ES2132268T3 (es) 1999-08-16
DE4342966A1 (de) 1994-09-08
EP0614204A3 (fr) 1994-12-14

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