EP0583715A1 - Electrical switch - Google Patents
Electrical switch Download PDFInfo
- Publication number
- EP0583715A1 EP0583715A1 EP93112752A EP93112752A EP0583715A1 EP 0583715 A1 EP0583715 A1 EP 0583715A1 EP 93112752 A EP93112752 A EP 93112752A EP 93112752 A EP93112752 A EP 93112752A EP 0583715 A1 EP0583715 A1 EP 0583715A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switching device
- switching
- housing
- electrical switching
- spring
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/58—Electric connections to or between contacts; Terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
- H01H5/04—Energy stored by deformation of elastic members
- H01H5/30—Energy stored by deformation of elastic members by buckling of disc springs
Definitions
- the invention relates to an electrical switching device, in particular switches or buttons, with a housing made of insulating material with connecting leads therein, with fixed contact pieces and at least one movable contact piece and with a switching spring which cooperates with the at least one movable contact piece and is held in the housing.
- a switching device which is designed as a button with snap contact and has a low overall height.
- the snap contact is arranged on a printed circuit board in the correct position and function, and is sealed and fixed airtight on the printed circuit board by means of an adhesive film.
- this arrangement behaves similarly to a bellows, so that dust, moist air and the like are sucked into the switching system with each switching operation, unless all-round good adhesive adhesion of the cover film is guaranteed.
- This is the problem of the arrangement described, since the attachment of the Jump contact and the adhesive film that fixes this can only take place after the printed circuit board has been fully assembled. In this case, solder residues and dirt and the like act as adhesion preventers, so that the adhesive bond can be interrupted locally.
- the switching spring forms a structural unit with the at least one movable contact piece, that the structural unit thus formed is inserted into the housing and sealed airtight, and that the fixed contact pieces are integrally connected to injection-molded or mechanically held connecting conductors in the housing.
- the assembly made of switching spring and movable contact piece inserted into the housing is taped by means of adhesive film.
- the switching spring serves as a movable contact piece.
- a preferred embodiment of the invention provides that at least two switching springs are provided, which are used to selectively contact a common fixed contact piece.
- each switching spring has a triangular shape.
- An arrangement of the switch springs, in which the switch springs are directed towards one another with their tips, has proven to be particularly advantageous when it comes to contacting a common fixed contact piece.
- the housing is prepared in such a way that a precisely contoured receptacle allows the contact-fitting switching spring assembly to be inserted with a precise fit and enables a simple sealing at the edge between the housing and the spring surface.
- the switching spring advantageously consists of a highly conductive spring material and is designed as a self-resetting snap contact.
- the switching spring is curved or it can have a trough-shaped impression, which gives the switching spring a monostable switching behavior.
- the switching springs In order to improve contacting with the fixed contact pieces, it may be expedient to provide the switching springs with bulges at the points provided for contacting. These bulges can be formed either by appropriate impressions or by molding.
- the switching device according to the invention with all the configurations described above is designed as a short-stroke switching device with a switching travel ⁇ 2 mm.
- a preferred use of the switching device according to the invention can be installed in a multiple switching device, for. B. window switch for motor vehicles may be provided, each switch spring by an actuator, for. B. rocker is acted upon.
- an electrical switching device 10 is shown in plan view, which has two pairs of switching springs 14 and a housing 12 made of plastic with fixed contact pieces 18, 20, 22 held therein in recesses 15.
- the two switching springs 14 are flat and are arranged at a short distance from the fixed contact pieces 18, 20, 22.
- the switching springs 14 are preferably made of highly conductive spring bronze and serve as a movable contact piece.
- the electrical switching device 10 When the electrical switching device 10 is actuated by depressing one of the switching springs 14, the fixed contact pieces 18, 20, 22 located below the relevant switching spring 14 are connected to one another and thereby one or more circuits are closed via conductor tracks 16.
- the switching springs 14 are each slightly upwards, i. H. away from the fixed contact pieces, arched, which enables their function as a snap contact. Due to the material-related stiffness of the switching springs 14, these have the tendency to return to their starting position when they are pressed by pushing in the direction of the fixed contact pieces 18, 20, 22.
- the electrical switching device shown and described in Figure 1 is shown in partial section in side view.
- the other features shown are designated by the corresponding reference numerals as in FIG. 1.
- the explanations in this regard accordingly also apply to the illustration in FIG. 2.
- the sealing of the switching springs 14 in the plastic molded housing 12 can be provided in various ways. Either the switch springs 14 are taped in accordance with the switches of the known type by means of an adhesive film 24 in the plastic molded housing 12, so that the problem of the reduction in liability which occurs in the known switches as a result of solder residues and contamination cannot be taken care of here, or the switch springs 14 are shaped. and / or anchored in the plastic housing 12, e.g. B. clamped between lateral boundaries and sealed by means of sealing compound.
- Such lateral boundaries can, for. B. be formed on each of the triangular sides of the switching spring 14 on the housing 12.
- the triangular edges of the switch springs are each supported by the limits not shown here non-positively, whereby the elasticity inherent in the plastic is used. As a result, slight changes in distance when the switching spring 14 is actuated are irrelevant.
- Another possibility of holding the switching springs 14 may be that on the plastic housing 12, for. B. hook-like formations are also provided in the region of the triangle sides, between which the switching springs 14 are guided and are held by the hook-shaped projection of the molding.
- conductor tracks 16, resistors 30 and LED 32 are connected to one another.
- the switching device 10 shown in detail in FIG. 2 is a so-called window switch for installation in motor vehicles.
- the switching springs 14 with the movable contact pieces are inserted into precisely fitting recesses 15, possibly with bead-like formations.
- This contact arrangement 14 is sealed airtight with an adhesive film 24, so that when the contacts 14, 18, 20, 22 are actuated, the wear caused by erosion is negligible.
- a button 26 is used to actuate the movable contact 14, which button has only a small switching travel due to the small switching stroke of the switching springs 14.
- the low overall height of the switching device 10 according to the invention proves to be advantageous, since switches of this type are often accommodated in the door trim of the motor vehicles, where, due to the design, there are only small installation depths and switches installed there may only have small overall heights.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Push-Button Switches (AREA)
- Slide Switches (AREA)
- Switch Cases, Indication, And Locking (AREA)
Abstract
Description
Die Erfindung betrifft ein elektrisches Schaltgerät, insbesondere Schalter oder Taster, mit einem Gehäuse aus Isolierstoff mit darin befindlichen Anschlußleitern, mit festen Kontaktstücken und wenigstens einem beweglichen Kontaktstück sowie mit einer Schaltfeder, die mit dem wenigstens einen beweglichen Kontaktstück zusammenarbeitet und im Gehäuse gehalten ist.The invention relates to an electrical switching device, in particular switches or buttons, with a housing made of insulating material with connecting leads therein, with fixed contact pieces and at least one movable contact piece and with a switching spring which cooperates with the at least one movable contact piece and is held in the housing.
Es ist ein Schaltgerät vorgeschlagen worden, das als Taster mit Sprungkontakt ausgebildet ist und eine geringe Bauhöhe aufweist. Hierbei ist der Sprungkontakt auf einer Leiterplatte lage- und funktionsgerecht angeordnet und mittels einer Klebefolie luftdicht auf der Leiterplatte abgeklebt und fixiert. Bei Betätigung des Sprungkontaktes verhält sich diese Anordnung ähnlich einem Blasebalg, so daß bei jedem Schaltvorgang Staub, feuchte Luft und ähnliches in das Schaltsystem eingesaugt werden, sofern nicht eine allseits umschließende gute Klebehaftung der Abdeckfolie gewährleistet ist. Hierin liegt das Problem der beschriebenen Anordnung, da die Anbringung des Sprungkontaktes sowie der diesem fixierenden Klebefolie erst nach Fertigmontage der Leiterplatte erfolgen kann. Hierbei wirken Lötrückstände sowie Verschmutzungen und ähnliches als Haftverhinderer, so daß die Klebehaftung örtlich unterbrochen sein kann.A switching device has been proposed which is designed as a button with snap contact and has a low overall height. In this case, the snap contact is arranged on a printed circuit board in the correct position and function, and is sealed and fixed airtight on the printed circuit board by means of an adhesive film. When the snap contact is actuated, this arrangement behaves similarly to a bellows, so that dust, moist air and the like are sucked into the switching system with each switching operation, unless all-round good adhesive adhesion of the cover film is guaranteed. This is the problem of the arrangement described, since the attachment of the Jump contact and the adhesive film that fixes this can only take place after the printed circuit board has been fully assembled. In this case, solder residues and dirt and the like act as adhesion preventers, so that the adhesive bond can be interrupted locally.
Ungünstig ist hierbei auch, daß der Sprungkontakt auf der Kupferschicht der Leiterplatte aufliegt und diese infolge der Schaltbewegung des Sprungkontaktes infolge Reibverschleiß stetig abgetragen wird. Hierdurch entstehen hohe Übergangswiderstände, welche sich nachteilig auf die Schaltleistung des Schaltgerätes auswirken.It is also unfavorable that the snap contact rests on the copper layer of the printed circuit board and that this is continuously removed due to the switching movement of the snap contact due to frictional wear. This creates high contact resistances, which have a negative impact on the switching capacity of the switching device.
Ausgehend vom vorstehend beschriebenen Stand der Technik ist es daher Aufgabe der Erfindung ein Schaltgerät der eingangs genannten Art zu schaffen, das unter Beibehaltung des Schaltprinzips und der geringen Bauhöhe einfach gestaltet und kostengünstig herstellbar ist und die aufgezeigten Nachteile vermeidet.Starting from the prior art described above, it is therefore an object of the invention to provide a switching device of the type mentioned which is simple in design and inexpensive to manufacture while maintaining the switching principle and the low overall height, and avoids the disadvantages indicated.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst. Danach ist vorgesehen, daß die Schaltfeder eine Baueinheit mit dem wenigstens einen beweglichen Kontaktstück bildet, daß die so gebildete Baueinheit in das Gehäuse eingelegt und luftdicht abgedichtet ist, und daß die festen Kontaktstücke einstückig mit im Gehäuse umspritzen oder mechanisch gehaltenen Anschlußleitern verbunden sind.This object is achieved by the characterizing features of claim 1. Thereafter, it is provided that the switching spring forms a structural unit with the at least one movable contact piece, that the structural unit thus formed is inserted into the housing and sealed airtight, and that the fixed contact pieces are integrally connected to injection-molded or mechanically held connecting conductors in the housing.
Zur luftdichten Abdichtung der beweglichen Kontaktstücke ist in zweckmäßiger Weiterbildung der Erfindung vorgesehen, daß die in das Gehäuse eingelegte Baueinheit aus Schaltfeder und beweglichem Kontaktstück mittels Klebefolie abgeklebt ist.For the airtight sealing of the movable contact pieces, it is provided in an expedient development of the invention that the assembly made of switching spring and movable contact piece inserted into the housing is taped by means of adhesive film.
Gemäß einer bevorzugten Ausgestaltung der Erfindung ist vorgesehen, daß die Schaltfeder als bewegliches Kontaktstück dient.According to a preferred embodiment of the invention, it is provided that the switching spring serves as a movable contact piece.
Eine bevorzugte Ausführungsform der Erfindung sieht vor, daß wenigstens zwei Schaltfedern vorgesehen sind, die zur wahlweisen Kontaktierung eines gemeinsamen festen Kontaktstückes dienen.A preferred embodiment of the invention provides that at least two switching springs are provided, which are used to selectively contact a common fixed contact piece.
Eine zweckmäßige Ausgestaltung der Erfindung sieht vor, daß jede Schaltfeder Dreieckform aufweist. Dabei erweist sich eine Anordnung der Schaltfedern, bei der die Schaltfedern mit ihren Spitzen aufeinander zu gerichtet sind als besonders günstig, wenn es um die Kontaktierung eines gemeinsamen festen Kontaktstückes geht.An expedient embodiment of the invention provides that each switching spring has a triangular shape. An arrangement of the switch springs, in which the switch springs are directed towards one another with their tips, has proven to be particularly advantageous when it comes to contacting a common fixed contact piece.
Entsprechend der Kontur der Schaltfeder ist das Gehäuse derart vorbereitet, daß es eine konturgenaue Aufnahme das paßgenaue Einlegen der Kontaktstück-Schaltfeder-Baueinheit erlaubt und eine einfache Abdichtung am Rand zwischen dem Gehäuse und der Federfläche ermöglicht.According to the contour of the switching spring, the housing is prepared in such a way that a precisely contoured receptacle allows the contact-fitting switching spring assembly to be inserted with a precise fit and enables a simple sealing at the edge between the housing and the spring surface.
Vorteilhafterweise besteht die Schaltfeder aus gut leitfähigem Federwerkstoff und ist als selbstrückstellender Sprungkontakt ausgebildet. Hierzu ist die Schaltfeder gewölbt oder sie kann eine muldenförmige Einprägung aufweisen, die der Schaltfeder ein monostabiles Schaltverhalten verleiht.The switching spring advantageously consists of a highly conductive spring material and is designed as a self-resetting snap contact. For this purpose, the switching spring is curved or it can have a trough-shaped impression, which gives the switching spring a monostable switching behavior.
Um die Kontaktierung mit den festen Kontaktstücken zu verbessern, kann es zweckmäßig sein, die Schaltfedern an den zur Kontaktierung vorgesehenen Stellen mit Auswölbungen zu versehen. Diese Auswölbungen können entweder durch entsprechende Einprägungen oder durch Anformungen gebildet sein.In order to improve contacting with the fixed contact pieces, it may be expedient to provide the switching springs with bulges at the points provided for contacting. These bulges can be formed either by appropriate impressions or by molding.
Das erfindungsgemäße Schaltgerät mit allen den vorstehend beschriebenen Ausgestaltungen ist als Kurzhub-Schaltgerät mit einem Schaltweg ≦ 2 mm ausgebildet. Eine bevorzugte Verwendung des erfindungsgemäßen Schaltgerätes kann durch Einbau in einem Mehrfachschaltgerät, z. B. Fensterheberschalter für Kraftfahrzeuge, vorgesehen sein, wobei jede Schaltfeder von einem Betätigungselement, z. B. Wippe, beaufschlagbar ist.The switching device according to the invention with all the configurations described above is designed as a short-stroke switching device with a switching travel ≦ 2 mm. A preferred use of the switching device according to the invention can be installed in a multiple switching device, for. B. window switch for motor vehicles may be provided, each switch spring by an actuator, for. B. rocker is acted upon.
Diese und weitere vorteilhafte Ausgestaltungen sind Gegenstände der Unteransprüche.These and other advantageous configurations are the subject of the dependent claims.
Anhand eines in der Zeichnung dargestellten Ausführungsbeispieles sollen die Erfindung, vorteilhafte Ausgestaltungen und Verbesserungen der Erfindung näher erläutert und beschrieben werden.The invention, advantageous refinements and improvements of the invention are to be explained and described in more detail using an exemplary embodiment shown in the drawing.
Es zeigen:
- Figur 1
- ein erfindungsgemäßes Schaltgerät in Draufsicht,
- Figur 2
- das Schaltgerät nach Figur 1 im Teilschnitt von der Seite.
- Figure 1
- a switching device according to the invention in plan view,
- Figure 2
- the switching device of Figure 1 in partial section from the side.
In Figur 1 ist ein elektrisches Schaltgerät 10 in Draufsicht gezeigt, welches zwei Schaltfedernpaare 14 sowie ein Gehäuse 12 aus Kunststoff mit darin in Ausnehmungen 15 gehaltenen festen Kontaktstücken 18, 20, 22 aufweist. Die beiden Schaltfedern 14 sind flächig ausgebildet und in geringem Abstand zu den festen Kontaktstücken 18, 20, 22 angeordnet.In Figure 1, an electrical switching device 10 is shown in plan view, which has two pairs of switching
Die Schaltfedern 14 bestehen vorzugsweise aus gut leitfähiger Federbronze und dienen als bewegliches Kontaktstück.The switching
Bei Betätigung des elektrischen Schaltgerätes 10 durch Niederdrücken einer der Schaltfedern 14 werden die unterhalb der betreffenden Schaltfeder 14 befindlichen festen Kontaktstücke 18, 20, 22 miteinander verbunden und hierdurch über Leiterbahnen 16 ein oder mehrere Stromkreise geschlossen. Die Schaltfedern 14 sind jeweils leicht nach oben, d. h. von den festen Kontaktstücken weg, gewölbt, wodurch ihre Funktion als Sprungkontakt ermöglicht ist. Aufgrund der materialbedingten Formsteifigkeit der Schaltfedern 14 haben diese nämlich bei ihrer Betätigung durch Niederdrücken in Richtung der festen Kontaktstück 18, 20, 22 das Bestreben, wieder in ihre Ausgangsstellung zu gelangen.When the electrical switching device 10 is actuated by depressing one of the
In Figur 2 ist das in Figur 1 darstellte und beschriebene elektrische Schaltgerät im Teilschnitt in Seitenansicht wiedergegeben. Die weiteren dargestellten Merkmale sind mit den entsprechenden Bezugsziffern wie in Figur 1 bezeichnet. Die diesbezüglichen Erläuterungen gelten demgemäß auch für die Darstellung in Figur 2. Die Abdichtung der Schaltfedern 14 in dem Kunststofformgehäuse 12 kann auf verschiedene Weise vorgesehen sein. Entweder werden die Schaltfedern 14 entsprechend den Schaltern der bekannten Art mittels einer Klebefolie 24 in dem Kunststofformgehäuse 12 abgeklebt, so daß das bei den bekannten Schaltern auftretende Problem der Haftungsminderung infolge von Lötrückständen und Verunreinigungen hier nicht zu besorgen ist, oder die Schaltfedern 14 werden form- und/oder kraftschlüssig in dem Kunststoffgehäuse 12 verankert, z. B. zwischen seitlichen Begrenzungen eingeklemmt und mittels DIchtungsmasse versiegelt. Derartige seitliche Begrenzungen können z. B. an jeder der Dreieckseiten der Schaltfeder 14 am Gehäuse 12 angeformt sein. Dabei stützen sich die Dreieckkanten der Schaltfedern jeweils an den hier nicht näher dargestellten Begrenzungen kraftschlüssig ab, wobei die dem Kunststoff innewohnende Elastizität genutzt wird. Hierdurch sind geringfügige Abstandsänderungen bei Betätigung der Schaltfeder 14 unbeachtlich. Eine andere Möglichkeit der Halterung der Schaltfedern 14 kann darin bestehen, daß an dem Kunststoffgehäuse 12, z. B. ebenfalls im Bereich der Dreiecksseiten hakenähnliche Anformungen vorgesehen sind, zwischen denen die Schaltfedern 14 geführt sind und durch den hakenförmigen Vorsprung der Anformung gehalten sind.In Figure 2, the electrical switching device shown and described in Figure 1 is shown in partial section in side view. The other features shown are designated by the corresponding reference numerals as in FIG. 1. The explanations in this regard accordingly also apply to the illustration in FIG. 2. The sealing of the switching
Außerdem sind in den gezeigten Anordnungen Leiterbahnen 16, Widerstände 30 und LED 32 miteinander verbunden.In addition, in the arrangements shown,
Bei dem in Figur 2 ausschnittsweise gezeigten Schaltgerät 10 handelt es sich um einen sogenannten Fensterheberschalter zum Einbau in Kraftfahrzeugen. In paßgenaue Ausnehmungen 15 ggf. mit wulstartigen Anformungen sind die Schaltfedern 14 mit den beweglichen Kontaktstücken eingesetzt. Diese Kontaktanordnung 14 ist mit einer Klebefolie 24 luftdicht abgedichtet, so daß bei Betätigung der Kontakte 14, 18, 20, 22 der Verschleiß durch Abbrand vernachlässigbar ist.The switching device 10 shown in detail in FIG. 2 is a so-called window switch for installation in motor vehicles. The
Zur Betätigung des beweglichen Kontaktes 14 dient eine Taste 26, die aufgrund des geringen Schalthubs der Schaltfedern 14 nur einen geringen Schaltweg hat.A
Insbesondere bei diesem Anwendungsfall erweist sich die geringe Bauhöhe des erfindungsgemäßen Schaltgerätes 10 als vorteilhaft, da derartige Schalter häufig in der Türverkleidung der Kraftfahrzeuge untergebracht werden, wo konstruktionsbedingt nur geringe Montagetiefen bestehen und dort installierte Schalter nur geringe Bauhöhen aufweisen dürfen.In this application in particular, the low overall height of the switching device 10 according to the invention proves to be advantageous, since switches of this type are often accommodated in the door trim of the motor vehicles, where, due to the design, there are only small installation depths and switches installed there may only have small overall heights.
Claims (13)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4226937A DE4226937A1 (en) | 1992-08-14 | 1992-08-14 | Electrical switching device |
| DE4226937 | 1992-08-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0583715A1 true EP0583715A1 (en) | 1994-02-23 |
| EP0583715B1 EP0583715B1 (en) | 1997-04-09 |
Family
ID=6465555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93112752A Expired - Lifetime EP0583715B1 (en) | 1992-08-14 | 1993-08-09 | Electrical switch |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0583715B1 (en) |
| DE (2) | DE4226937A1 (en) |
| ES (1) | ES2103049T3 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2455522A1 (en) * | 1973-11-27 | 1975-06-05 | Gte Atea N V S A | PRESSURE SWITCHES AND ITS APPLICATION IN A PUSH BUTTON SELECTION SWITCH UNIT FOR TELEVISIONS |
| DE2705756A1 (en) * | 1977-02-11 | 1978-08-17 | Alps Electric Co Ltd | Push button switch for desk computer - has frame with contact bracket attached to holder and centre disc section curved from base |
| DE2931370A1 (en) * | 1979-08-02 | 1981-02-05 | Petrick Gmbh Elektro Mech | Double action multicontact tumbler switch - has first bridging leaf spring depressed onto second springs under first and further pressure |
| US4331851A (en) * | 1980-06-16 | 1982-05-25 | Texas Instruments Incorporated | Printed circuit board having data input devices mounted thereon and input devices therefor |
| GB2229577A (en) * | 1989-03-23 | 1990-09-26 | Well Treasure Ind Ltd | Mounting contact elements on printed circuit boards |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4276460A (en) * | 1979-05-29 | 1981-06-30 | Texas Instruments Incorporated | Printed circuit board switch |
| CH657227A5 (en) * | 1982-11-05 | 1986-08-15 | Fela E Uhlmann Ag Fuer Gedruck | SWITCHBOARD. |
| DE3441129A1 (en) * | 1984-11-10 | 1986-05-15 | Telefunken electronic GmbH, 7100 Heilbronn | Push-button switch which is extrusion coated with foam material |
| DE3520211A1 (en) * | 1985-06-05 | 1986-12-11 | Elektronikus Mérökészülékek Gyára, Budapest | Switching element having three contact points |
| SU1367061A1 (en) * | 1986-02-14 | 1988-01-15 | Предприятие П/Я Г-4710 | Push-button selector switch |
| DE3818562A1 (en) * | 1988-06-01 | 1989-12-07 | Swf Auto Electric Gmbh | Electrical push-button switch, especially for switching on a reversing light of a motor vehicle |
| DD298178A5 (en) * | 1989-09-19 | 1992-02-06 | �K�K�K�K@�������`������@�����������@�������k�� | Luminous keying |
-
1992
- 1992-08-14 DE DE4226937A patent/DE4226937A1/en not_active Withdrawn
-
1993
- 1993-08-09 EP EP93112752A patent/EP0583715B1/en not_active Expired - Lifetime
- 1993-08-09 DE DE59306090T patent/DE59306090D1/en not_active Expired - Fee Related
- 1993-08-09 ES ES93112752T patent/ES2103049T3/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2455522A1 (en) * | 1973-11-27 | 1975-06-05 | Gte Atea N V S A | PRESSURE SWITCHES AND ITS APPLICATION IN A PUSH BUTTON SELECTION SWITCH UNIT FOR TELEVISIONS |
| DE2705756A1 (en) * | 1977-02-11 | 1978-08-17 | Alps Electric Co Ltd | Push button switch for desk computer - has frame with contact bracket attached to holder and centre disc section curved from base |
| DE2931370A1 (en) * | 1979-08-02 | 1981-02-05 | Petrick Gmbh Elektro Mech | Double action multicontact tumbler switch - has first bridging leaf spring depressed onto second springs under first and further pressure |
| US4331851A (en) * | 1980-06-16 | 1982-05-25 | Texas Instruments Incorporated | Printed circuit board having data input devices mounted thereon and input devices therefor |
| GB2229577A (en) * | 1989-03-23 | 1990-09-26 | Well Treasure Ind Ltd | Mounting contact elements on printed circuit boards |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59306090D1 (en) | 1997-05-15 |
| EP0583715B1 (en) | 1997-04-09 |
| DE4226937A1 (en) | 1994-02-17 |
| ES2103049T3 (en) | 1997-08-16 |
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| DE3915767A1 (en) | Electrical switch unit for vehicle servo drive control - has number of contacts in parallel on pair of pressed metal elements |
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