EP0405079A2 - Contact à membrane pour des boutons-poussoir - Google Patents
Contact à membrane pour des boutons-poussoir Download PDFInfo
- Publication number
- EP0405079A2 EP0405079A2 EP90107215A EP90107215A EP0405079A2 EP 0405079 A2 EP0405079 A2 EP 0405079A2 EP 90107215 A EP90107215 A EP 90107215A EP 90107215 A EP90107215 A EP 90107215A EP 0405079 A2 EP0405079 A2 EP 0405079A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- frame
- central longitudinal
- longitudinal web
- contact membrane
- switching element
- 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
Links
Images
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
- H01H13/04—Cases; Covers
-
- 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
- H01H13/26—Snap-action arrangements depending upon deformation of elastic members
- H01H13/36—Snap-action arrangements depending upon deformation of elastic members using flexing of blade springs
- H01H13/38—Single blade moved across dead-centre position
Definitions
- the present invention relates to a contact membrane for a switching element of a key switch according to the preamble of claim 1.
- each longitudinal part of the rectangular frame is shortened in its longitudinal center by a V- or ⁇ -shaped upwardly curved bead, whereby the central longitudinal web is arched upwards with elastic deformation.
- each outer corner of the rectangular frame is provided with a mandrel which is bent downwards at right angles to the frame parts and is intended to be anchored in the bottom of the switching element and thereby to hold the contact membrane with its four corners on the bottom of the switching element. This gives the entire contact membrane the pretension that enables it to spring back into the rest position.
- Two diagonal mandrels are longer than the other two.
- a flat or slightly curved contact element is also arranged below the central longitudinal web of the rectangular frame, which is also provided with a mandrel penetrating the base, which serves as the second electrical connection element of the switching element.
- the contact membrane is attached to the bottom of the switching element in such a way that the central longitudinal web concavely bulges the bottom of the switching element and completely assumes its rest or first jumping position and is therefore stable.
- the known contact membrane and its type of attachment to the bottom of a switching element show two disadvantages. Firstly, when the central longitudinal web is pushed through, the entire frame is subjected to heavy material stress with a corresponding risk of breakage, because all four corners of the rectangular frame are firmly anchored to the bottom of the switching element and therefore do not exert the forces which are effective when pushing through can give in. This can be partially remedied by elastic storage of two diagonal corners. Secondly, because of the anchoring of the four corners of the frame in the bottom of the switching element, there is a disadvantageous switching characteristic in that a force which varies only slightly over the entire switching path has to be exerted on the central longitudinal web of the frame.
- the object of the present invention is to provide a contact membrane of the type mentioned, which is mechanically little stressed when it is actuated and conveys a pronounced switching sensation, that is to say in which, for reliable contact, a greater force is only applied over a short distance of the entire switching path central longitudinal web of the frame of the contact membrane must be exercised.
- the contact membrane according to the invention has the features stated in the characterizing part of patent claim 1.
- the transverse parts of the frame can deflect elastically when the central longitudinal web of the frame is pushed through, so that there is only a small amount of material stress and a risk of breakage is greatly reduced, that is to say , the permissible number of operations is greatly increased. Furthermore, the deformation work on the contact membrane when closing the contacts is reduced because of the Dodge possibility of the two free end areas of the frame.
- the invention also relates to a switching element with a contact membrane according to claim 1.
- the switching element according to the invention is defined in claim 4.
- a switch housing which contains an actuating element, can be securely placed on the switching element according to the invention, the arrangement of the actuating element in the switch housing not, and in particular not disadvantageously, being able to influence the switching characteristic of the switching element, since the actuating mechanism of the contact membrane is enclosed in the switching element.
- the present contact membrane consists of a stamped sheet metal, one-piece frame 1, 1 ', which has two longitudinal parts 2, two transverse parts 3 and a central longitudinal web 4. Furthermore, the two longitudinal parts 2 are provided centrally in the longitudinal direction, each with a laterally outer, with the frame 1, 1 'connected and integrally made fastening tab 5 in the form of an eyelet. Adjacent to the fastening tabs 5, the longitudinal parts 2 are provided with beads 6 and 6 '(FIGS. 1 to 3), which are explained in more detail in FIGS. 2 and 3. From Fig.
- the frame 1, 1 ' is rounded in its inner and outer corner regions, and that the central longitudinal web 4 is stiffened in its central region by a greater width (or a greater thickness) than in its end regions, in which the longitudinal web 4 merges into the transverse parts 3 .
- the forces resulting from the central longitudinal web 4 being pressed down are kept within narrow limits in terms of size and direction and are introduced into the transverse parts 3.
- the two to the flat bottom of the beads 6, 6 'coplanar mounting tab 5 of the frame 1, 1' form a support point 8 on a wall part, for example a floor, a switching element. They can also be used for attachment to the wall part by riveting, soldering or the like. 2 and 3, this wall part is indicated and designated 7. At least one of the mounting tabs 5 also serves as a fixed electrical connection element of the frame 1, 1 '.
- the beads 6 or 6 'of the longitudinal parts 2 indicated on both sides of the fastening tabs 5 in FIG. 1 are formed as bends with two rounded bending edges according to FIGS. 2 and 3.
- the convex shape of the frame 1, 1 '(including the beads 6, 6') with respect to the support point 8 or the straight or concave shape of the central longitudinal web 4 can preferably be achieved by a predominantly plastic shaping such as punching, rolling, pressing, deep-drawing , Injection molding or die casting can be achieved.
- the preferred aim is that the contact membrane has as little internal stress as possible in its rest position.
- the frame 1 is designed with the beads 6 in such a way that the longitudinal parts 2 lie in a plane approximately parallel to the support point 8 or the fastening tabs 5 and have an approximately flat and convex (upward) curve at the ends to have.
- the central longitudinal web 4 between the transverse parts 3 is bulged upwards relatively strongly compared to the longitudinal parts 2.
- the frame 1 'with the beads 6' is designed such that the central longitudinal web 4 is only slightly curved upwards, that is, approximately flat or parallel to the mounting tab 5.
- the longitudinal webs 2 are relatively strongly bent upwards away from the beads 6 toward the ends of the central longitudinal web 4.
- the central longitudinal web 4 can now be exerted by exerting a force P acting vertically on it in its longitudinal center, with elastic deformation of all the frames parts are pressed over a dead center, after overcoming the central longitudinal web 4 assumes a second jumping position.
- the second jump position is unstable if the shape of the frame 1, 1 'and the central longitudinal web 4 in the first jump position is caused by a largely permanent shape.
- the central longitudinal web 4 thus performs a tactile movement.
- this tactile movement is used to effect an electrical tactile contact in such a way that a fixed contact element, not shown in FIGS. 2 and 3, is arranged on the wall part 7 of the switching element below the central region of the longitudinal web 4 which momentarily closes and keeps the circuit with the connecting elements of the eyelets 5 while the force P is being applied (tapping).
- the contact membrane according to the invention described with reference to FIGS. 1 to 3 has the advantages that it lies loosely on a wall part of the switching element or can be attached to only one or two points (fastening tab 5) and that when the central longitudinal web 4 is pushed through, the mechanical stress on all frame parts is considerably smaller because the outer frame regions, including the transverse parts 3 of the frame 1, 1 ', can yield to the stress in the direction of all three spatial axes. Above all, however, the contact membrane according to the invention becomes a cheaper one Switching or keying characteristics achieved, which is explained below with reference to FIG. 4.
- the force P to be initially applied from the starting position A is low and only increases with an increasing path length L to an approximately equally large maximum value in the dead center position B.
- the force P then drops steeply to a low value up to the contact position C.
- This contact membrane can thus be operated reliably by tapping it much more easily, which means that it conveys a much more favorable tactile feeling.
- FIGS. 5 to 10 An embodiment of a circuit element according to the invention containing the contact membrane according to FIGS. 1 to 3 is shown in FIGS. 5 to 10.
- the switching element 11 shown is composed of a pot-shaped base part 12 with a base 13 and a collar 14, from the contact membrane attached to the base 12 in the form of the frame 1 of FIGS. 1 to 3, from a displaceable in the base part 12 and on the central longitudinal web 4 of the frame 1 adjacent plate 15, which is provided with projecting retaining cams 16 for an actuating element, not shown, and from a retaining flange 17 connected to the collar 14 of the base part 12 for the movable plate 15.
- the frame 1 On the inside of the bottom 13 of the base part 12, the frame 1 is held on its fastening tabs 5 (FIG.
- buttons 18 and the contact member 19 are connected to band-shaped conductors 20 and 21 embedded in the base 13, which are guided to the outside of the base part 12. 7 and 10, the conductors 20, 21 may be bent at right angles on the outside of the base part 12, for example, to be dashed when the switching element 11 is mounted on one in FIG. 7 shown carrier plate 22, for example a printed circuit board, to penetrate holes 23 of the carrier plate 22.
- each corner of the base 13 and the collar 14 of the base part 12 there is also a channel 24 which is perpendicular to the base 13 and which carries out the connecting conductors 25 of a display device 26 or 27 (FIGS. 8 to 10) inserted between the holding cams 16, for example a light emitting diode.
- a display device 26 or 27 FIGS. 8 to 10
- a first embodiment of such a display device 26 and in FIGS. 9 and 10 a second embodiment of a display device 27 of different shape and dimensions are indicated or shown in dashed lines.
- Diametrical projections 28 of the displaceable plate 15 serve to guide the plate 15 in the base part 12, for which purpose the collar 14 is provided with corresponding diametrical grooves 29 (FIG. 10). Furthermore, the holding cams 16 are provided with radially extending end plates 30 (FIGS. 7 and 10) in order to fix the position of the actuating element to be attached.
- the switching element 11 shown with the contact membrane 1 according to the invention is compact and versatile. It only has to be supplemented by an actuating element of any configuration that can be placed on the holding cams 16.
- the distance of the frame 1, 1 'from the wall part 7 must in this case be achieved by the wall base 7 itself arranged bearing base on which the frame 1 is placed. In any case, however, the relative bulge of the frame 1, 10 and the central longitudinal web 4 should be given by a predominantly plastic shape of all parts of the contact membrane.
- the contact element can consist of spring steel or another electrically conductive and resilient material.
Landscapes
- Push-Button Switches (AREA)
- Switch Cases, Indication, And Locking (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH2442/89A CH678240A5 (fr) | 1989-06-30 | 1989-06-30 | |
CH2442/89 | 1989-06-30 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0405079A2 true EP0405079A2 (fr) | 1991-01-02 |
EP0405079A3 EP0405079A3 (en) | 1992-06-03 |
EP0405079B1 EP0405079B1 (fr) | 1994-12-28 |
Family
ID=4233918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90107215A Expired - Lifetime EP0405079B1 (fr) | 1989-06-30 | 1990-04-14 | Contact à membrane pour des boutons-poussoir |
Country Status (6)
Country | Link |
---|---|
US (1) | US5079394A (fr) |
EP (1) | EP0405079B1 (fr) |
JP (1) | JPH0340320A (fr) |
AT (1) | ATE116473T1 (fr) |
CH (1) | CH678240A5 (fr) |
DE (1) | DE59008109D1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0872863A3 (fr) * | 1997-04-14 | 1999-05-12 | Alps Electric Co., Ltd. | Interrupteur à bouton-poussoir |
EP2053622A3 (fr) * | 2007-10-24 | 2010-10-20 | Nihon Kaiheiki Industrial Company, Ltd. | Dispositif d'interrupteur à bouton-poussoir avec dispositif d'affichage |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5671841A (en) * | 1995-08-14 | 1997-09-30 | Calculagraph Co. | Method and apparatus for switching mechanism |
JP4000715B2 (ja) * | 1999-04-23 | 2007-10-31 | 松下電工株式会社 | 同軸リレー |
US6140596A (en) * | 2000-01-04 | 2000-10-31 | Shin Jiuh Corporation | Tact switch |
SG100707A1 (en) * | 2000-06-07 | 2003-12-26 | Ebauchesfabrik Eta Ag | Control device with a snap function and watch fitted therewith |
JP4088577B2 (ja) * | 2003-10-16 | 2008-05-21 | ホシデン株式会社 | プッシュオンスイッチ用可動接点およびプッシュオンスイッチ |
JP2005253856A (ja) * | 2004-03-15 | 2005-09-22 | Izumi Products Co | 往復式電気かみそりの内刃製造方法 |
FR2888395B1 (fr) * | 2005-07-07 | 2014-02-28 | Itt Mfg Enterprises Inc | Commutateur electrique miniaturise du type normalement ferme |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB696816A (en) * | 1950-06-09 | 1953-09-09 | Ashley Accessories Ltd | Improvements in or relating to snap-action electric switches |
US4385218A (en) * | 1981-04-21 | 1983-05-24 | Matsushita Electric Industrial Co., Ltd. | Electric switch |
DE3241159A1 (de) * | 1982-11-08 | 1984-05-10 | Schlegel Georg Fa | Befehlstaster zum einbau in eine schalttafel oder dergleichen |
US4484042A (en) * | 1982-08-03 | 1984-11-20 | Alps Electric Co., Ltd. | Snap action push button switch |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH438674A4 (fr) * | 1974-03-29 | 1975-10-31 | ||
DE3335275A1 (de) * | 1982-11-08 | 1985-04-18 | Schlegel Georg Fa | Befehlstaster zum einbau in eine schalttafel oder dergleichen |
-
1989
- 1989-06-30 CH CH2442/89A patent/CH678240A5/de not_active IP Right Cessation
-
1990
- 1990-04-14 DE DE59008109T patent/DE59008109D1/de not_active Expired - Fee Related
- 1990-04-14 AT AT90107215T patent/ATE116473T1/de active
- 1990-04-14 EP EP90107215A patent/EP0405079B1/fr not_active Expired - Lifetime
- 1990-05-30 US US07/530,612 patent/US5079394A/en not_active Expired - Fee Related
- 1990-06-11 JP JP2152517A patent/JPH0340320A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB696816A (en) * | 1950-06-09 | 1953-09-09 | Ashley Accessories Ltd | Improvements in or relating to snap-action electric switches |
US4385218A (en) * | 1981-04-21 | 1983-05-24 | Matsushita Electric Industrial Co., Ltd. | Electric switch |
US4484042A (en) * | 1982-08-03 | 1984-11-20 | Alps Electric Co., Ltd. | Snap action push button switch |
DE3241159A1 (de) * | 1982-11-08 | 1984-05-10 | Schlegel Georg Fa | Befehlstaster zum einbau in eine schalttafel oder dergleichen |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0872863A3 (fr) * | 1997-04-14 | 1999-05-12 | Alps Electric Co., Ltd. | Interrupteur à bouton-poussoir |
EP2053622A3 (fr) * | 2007-10-24 | 2010-10-20 | Nihon Kaiheiki Industrial Company, Ltd. | Dispositif d'interrupteur à bouton-poussoir avec dispositif d'affichage |
Also Published As
Publication number | Publication date |
---|---|
JPH0340320A (ja) | 1991-02-21 |
ATE116473T1 (de) | 1995-01-15 |
EP0405079B1 (fr) | 1994-12-28 |
CH678240A5 (fr) | 1991-08-15 |
US5079394A (en) | 1992-01-07 |
DE59008109D1 (de) | 1995-02-09 |
EP0405079A3 (en) | 1992-06-03 |
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