EP2148344A2 - Microswitch - Google Patents

Microswitch Download PDF

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Publication number
EP2148344A2
EP2148344A2 EP09008713A EP09008713A EP2148344A2 EP 2148344 A2 EP2148344 A2 EP 2148344A2 EP 09008713 A EP09008713 A EP 09008713A EP 09008713 A EP09008713 A EP 09008713A EP 2148344 A2 EP2148344 A2 EP 2148344A2
Authority
EP
European Patent Office
Prior art keywords
spring
contact
tongue
spring tongue
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.)
Granted
Application number
EP09008713A
Other languages
German (de)
French (fr)
Other versions
EP2148344A3 (en
EP2148344B1 (en
Inventor
Martin Koepsell
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.)
Johnson Electric SA
Original Assignee
Saia Burgess Oldenburg GmbH and Co KG
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.)
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Publication date
Application filed by Saia Burgess Oldenburg GmbH and Co KG filed Critical Saia Burgess Oldenburg GmbH and Co KG
Priority to PL09008713T priority Critical patent/PL2148344T3/en
Publication of EP2148344A2 publication Critical patent/EP2148344A2/en
Publication of EP2148344A3 publication Critical patent/EP2148344A3/en
Application granted granted Critical
Publication of EP2148344B1 publication Critical patent/EP2148344B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01H5/18—Energy stored by deformation of elastic members by flexing of blade springs
    • H01H5/22—Energy stored by deformation of elastic members by flexing of blade springs blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg
    • 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
    • H01H13/40—Blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg

Definitions

  • the invention relates to an electrical switch, in particular a micro-switch, with at least one contact spring, which can be converted into different switch positions by an actuator, which is arranged on an armature formed as an electrical contact.
  • Electrical switches of the aforementioned type such as microswitches or the like, are used in particular in measurement and control technology in order to be able to spontaneously and unambiguously carry out the switching operations, which are frequently to be carried out in corresponding current and control circuits in these application areas, with a particularly high repeatability.
  • the electrical switches used for these special switching operations usually have a respective the switch positions of the micro-switch determining, a tilting movement during actuation exporting contact spring.
  • a mechanical actuator such as a housing of the microswitch penetrating plunger, the contact area of the contact spring of a switching position and with the contact area in Plant standing current conductive contact in the other switching position and thus transferred into contact with another contact.
  • the distance between the contacts of the electric switch which can be used, for example, as normally open, normally closed or change-over, is generally only one tenth of a millimeter to a few millimeters.
  • the contact springs used in such electrical switches for implementing the switching operation form a tilting system, which is mechanically guided, inter alia, to minimize the contact friction occurring between the contact region of the contact spring and a respective current-conducting contact of the microswitch.
  • the outer guide is also necessary to carry out a defined, unambiguous movement, frequently causing a deteriorated function of the switch due to the friction hysteresis.
  • the formation of a contact spring in the direction of actuation of the actuator receiving guide also always means a structurally complex design of the switch and is connected at the same time with a correspondingly high cost.
  • the invention is based on the object to improve an electrical switch of the aforementioned type to the effect that this can be simplified and therefore produced inexpensively.
  • the contact spring has a closed spring frame, the spring frame two , Be arranged in approximately opposite directions extending spring tongues pliable, wherein the first spring tongue is formed as a return for the actuator, and the second spring tongue controls the switching function of the contact region of the contact spring, and that the spring tongues engage abutting surface areas of the armature so supporting in that the contact spring has a permanent stable position during its actuation.
  • the first spring tongue formed as a return spring for the actuating member is a folded-out spring leaf loaded with compressive stress at least in its longitudinal direction.
  • the use of a spring leaf provides a structurally advantageous possibility for forming the preferably flexibly received, first spring tongue.
  • the spring tongue also located in buckling case also generates a degressive spring characteristic during actuation, whereby the wear on the actuator, which may be formed, for example, as a plunger even with relatively large travel distances can be kept low with advantage.
  • With the use of a spring leaf is also ensured that in addition to the advantageous return function for the actuator at the same time one of second spring tongue counteracting spring force is generated, by means of which an advantageous balance of each acting in opposite directions spring forces of the spring tongues is created.
  • the first spring tongue preferably has, in one of the switching positions of the contact spring, a leg section extending from the articulation point on the spring frame, approximately parallel to the spring frame plane, followed by at least one further leg section having an approximately uniformly curved course.
  • the actuator located in its rest position or the upper end position is permanently acted upon by the always elastically deformed spring tongue with a spring force.
  • the spring frame of the contact spring Upon actuation of the actuator, in particular, the spring frame of the contact spring performs a tilting movement. Trained as a retractor spring tongue is further buckled by acting on them, increasing compressive stress and may have after reaching the lower end leg leg sections that have both different radii of curvature and different directions of curvature.
  • the second spring tongue of the contact spring has a curved shape.
  • a preferably plastically deformed spring tongue an advantageously improved switching function or snap movement of the second spring tongue is effected, which after reaching the switching position by the actuating member abruptly performs a change in the switching position of the contact region of the contact spring.
  • the spring tongue has, in particular, a relatively stiff configuration or has a kink-stiffener geometry, whereby a transition into the buckling case is advantageously prevented even with a relatively high pressure force acting in the longitudinal direction of the spring tongue.
  • the second spring tongue can of course also be straight.
  • the first spring tongue has in relation to the second spring tongue at approximately the same cross-section on a larger length, which in particular ensures that only one of the spring frame of the contact spring in particular integrally formed spring tongues buckles at a force acting in the longitudinal direction of the spring pressure force. This has an advantageous effect on improving the stable position of the contact spring within the microswitch despite the ungauged movement of the contact spring.
  • the length dimension of the first spring tongue is at least twice as long as the length dimension of the second spring tongue.
  • each spring tongue in the region of its articulation on the spring frame has a constriction which reduces its cross-section.
  • an advantageous joint-like connection of the spring tongues to the otherwise relatively stiff formed spring frame of the contact spring is generated.
  • this is an optimal deformation of the buckled, first spring tongue in response to the Switching position of the contact spring achieved and on the other hand, the differential path between switching position and rubschaltlage reduce with advantage.
  • the switching path is minimized, which in turn has an advantageous effect on the switching behavior of such inventively designed electrical switch.
  • the contact region of the contact spring which is assigned to the second spring tongue controlling the switching process, is designed as a rolled-up hollow mold section, which represents an advantageously simple possibility for forming the contact region which can be brought into contact with the contacts of the microswitch. Furthermore, it is ensured by the formation of the contact region as a hollow mold section and the resulting relatively low mass, during the switching operation, an advantageous low-vibration placement of the surface of the contact area to a respective contact surface of the microswitch.
  • the formed as a hollow mold portion contact area is arranged in particular at an end portion of the spring frame, from which extends the second spring tongue approximately in the direction of the opposite end.
  • the articulated at the armature supporting contact spring it is provided that the articulation point is formed for the second spring tongue in the rolled-up hollow mold portion of the contact spring.
  • the connection of the second spring tongue is preferably in an area above the Federrahmenebene, whereby in particular the remindschaltlage or the reset point is shifted with advantage in the direction of the switching position and the switching point.
  • the spring tongues which are preferably arranged at opposite ends of the contact spring, engage parallel to each other staggered portions of the particular angled trained anchor.
  • the spring tongues which are preferably arranged at opposite ends of the contact spring, engage parallel to each other staggered portions of the particular angled trained anchor.
  • a micro-switch which has at least one housing 2 and a housing 3 penetrating actuator 3, which in turn is in contact with a convertible into different switching positions contact spring 4.
  • the contact spring 4 has a closed spring frame 5, are arranged on the two, approximately in opposite directions extending spring tongues 6, 7 pliable.
  • the spring tongues 6, 7 are in particular formed integrally with the spring frame 5, and are supported on both sides on an electrical contact Anchor 8 off.
  • a first spring tongue 6 is an unfolded spring leaf which is loaded at least in its longitudinal direction and which also serves as a return spring for the actuating member 3.
  • the second spring tongue 7 controls the switching function of a contact region 9 formed on the contact spring 4, which switches back and forth between a top contact 10 and a bottom contact 11 upon a corresponding actuation of the contact spring 4.
  • the second spring tongue always leads on reaching the switching position or the rinseschaltlage by the actuator 3 a spontaneous and unambiguous Umklappmony.
  • Fig. 2 the actuated micro-switch 1 is shown, wherein the actuator designed as a plunger 3 is in its end position.
  • the contact spring 4 has then carried out a tilting movement, and lies with its contact region 9 on the lower contact 11.
  • the first spring tongue 6 is further buckled by the increased compressive stress in its longitudinal direction, but the spring tongue 6 is deformed only elastically and thus after removal of the force acting on the actuator 3 this automatically by the first spring tongue 6 in its rest position ( Fig. 1 ) is moved back.
  • the second spring tongue 7 in its upper switching position, so that the contact portion 9 of the contact spring 4 in turn rests on the upper contact 10.
  • the current-carrying armature 8 is angled so that the free ends of the spring tongues 6, 7 engage supportingly at parallel staggered sections 12, 13 of the armature 8.
  • a sealing region sealingly closing the opening portion 15 is provided, which is integrally formed on the housing 2 and the actuator 3 in a form-fitting manner.
  • Fig. 3 shows in particular the coming into use in microswitch 1 contact spring 4 in an enlarged view, in particular to illustrate their design.
  • the contact spring 4 is shown in the installed state, so that the first spring tongue 6 is shown led out of its actual resting in the plane of the spring frame 5 rest position.
  • the spring frame 5 of the contact spring 4 has at one end always with the actuator 3 ( Fig. 1 ) in contact bearing surface 16, which is formed curved due to the export by the contact spring tilting movement.
  • At the opposite end of the spring frame 5 of each standing with the upper contact 10 or the lower contact 11 in contact contact area 9 is formed, which is preferably a rolled-up hollow mold section.
  • first spring tongue 6 in relation to the second spring tongue 7 at least twice the length, so that it is ensured that only the first spring tongue 6 buckles at a compressive stress acting in its longitudinal direction.
  • the second spring tongue 7 is always relatively stable in spite of their flexurally flexible articulation on the spring frame 5 and has, as Fig. 3 illustrates already in the delivery state a curved shape, which always leads to a spontaneous or sudden switching of the second spring tongue 7 when reaching the switching position.
  • Fig. 4 shows a second embodiment of a contact spring 17 according to the invention, which is in particular equipped with a bending out of the plane of the spring frame 5, bend soft-shaped, but straight extending second spring tongue 18. Identical components are designated by the same reference numbers.

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  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)

Abstract

The switch has contact springs (4) transferred into different switching positions by an actuating element and arranged at an anchor formed as an electrical contact. Spring tongues (6, 7) are arranged at a closed spring frame (5). One spring tongue is formed as a resetting unit for the actuating element. Another spring tongue controls switching functions of a contact region (9) of the springs. The tongues are engaged at surface regions of the anchor in a supporting manner such that the springs exhibit stable position during actuation, where the surface regions are turned away from each other.

Description

Die Erfindung bezieht sich auf einen elektrischen Schalter, insbesondere einen Mikroschalter, mit zumindest einer durch ein Betätigungsglied in verschiedene Schaltstellungen überführbaren Kontaktfeder, welche an einem als elektrischer Kontakt ausgebildeten Anker angeordnet ist.The invention relates to an electrical switch, in particular a micro-switch, with at least one contact spring, which can be converted into different switch positions by an actuator, which is arranged on an armature formed as an electrical contact.

Elektrische Schalter vorbezeichneter Gattung, wie Mikroschalter oder dergleichen, werden insbesondere in der Meß-, Steuer- und Regelungstechnik eingesetzt, um die in diesen Anwendungsbereichen häufig in entsprechenden Strom- und Steuerkreisen vorzunehmende Schaltvorgänge spontan und eindeutig mit einer insbesondere relativ hohen Wiederholgenauigkeit durchführen zu können. Die für diese speziellen Schaltvorgänge verwendeten elektrischen Schalter weisen üblicherweise eine jeweils die Schaltstellungen des Mikroschalters bestimmende, eine Kippbewegung während des Betätigens ausführende Kontaktfeder auf. Durch die Lageänderung eines mechanischen Betätigungsgliedes, wie zum Beispiel einem das Gehäuse des Mikroschalters durchdringenden Stößel, wird der Kontaktbereich der Kontaktfeder von einer Schaltstellung und einem mit dem Kontaktbereich in Anlage stehenden Strom leitenden Kontakt in die jeweils andere Schaltstellung und somit in Anlage mit einem weiteren Kontakt überführt. Der Abstand zwischen den Kontakten des beispielsweise als Schließer, Öffner oder Wechsler einsetzbaren elektrischen Schalters beträgt dabei in der Regel nur zehntel Millimeter bis wenige Millimeter.Electrical switches of the aforementioned type, such as microswitches or the like, are used in particular in measurement and control technology in order to be able to spontaneously and unambiguously carry out the switching operations, which are frequently to be carried out in corresponding current and control circuits in these application areas, with a particularly high repeatability. The electrical switches used for these special switching operations usually have a respective the switch positions of the micro-switch determining, a tilting movement during actuation exporting contact spring. By the change in position of a mechanical actuator, such as a housing of the microswitch penetrating plunger, the contact area of the contact spring of a switching position and with the contact area in Plant standing current conductive contact in the other switching position and thus transferred into contact with another contact. The distance between the contacts of the electric switch, which can be used, for example, as normally open, normally closed or change-over, is generally only one tenth of a millimeter to a few millimeters.

Die in derartigen elektrischen Schaltern zur Umsetzung des Schaltvorganges eingesetzten Kontaktfedern bilden ein Kippsystem aus, welches unter anderem zur Minimierung der auftretenden Kontaktreibung zwischen dem Kontaktbereich der Kontaktfeder und einem jeweiligen Strom leitenden Kontakt des Mikroschalters mechanisch geführt wird. Die äußere Führung ist ebenfalls notwendig, um eine definierte, eindeutige Bewegung auszuführen, wobei häufig eine durch die Reibungshysterese bedingte, verschlechterte Funktion des Schalters verursacht ist. Die Ausbildung einer die Kontaktfeder in Betätigungsrichtung des Betätigungsgliedes aufnehmenden Führung bedeutet zudem stets eine konstruktiv aufwendige Ausgestaltung des Schalters und ist gleichzeitig mit einem entsprechend hohen Kostenaufwand verbunden.The contact springs used in such electrical switches for implementing the switching operation form a tilting system, which is mechanically guided, inter alia, to minimize the contact friction occurring between the contact region of the contact spring and a respective current-conducting contact of the microswitch. The outer guide is also necessary to carry out a defined, unambiguous movement, frequently causing a deteriorated function of the switch due to the friction hysteresis. The formation of a contact spring in the direction of actuation of the actuator receiving guide also always means a structurally complex design of the switch and is connected at the same time with a correspondingly high cost.

Der Erfindung liegt die Aufgabe zu Grunde, einen elektrischen Schalter der vorbezeichneten Gattung dahingehend zu verbessern, dass dieser sich vereinfacht und dementsprechend kostengünstig herstellen lässt.The invention is based on the object to improve an electrical switch of the aforementioned type to the effect that this can be simplified and therefore produced inexpensively.

Die Lösung der Aufgabe erfolgt erfindungsgemäß durch einen elektrischen Schalter mit den Merkmalen des Patentanspruches 1. Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den Ansprüchen 2 bis 9 angegeben.The object is achieved by an electric switch with the features of claim 1. Advantageous Further developments and refinements of the invention are specified in claims 2 to 9.

Bei einem elektrischen Schalter, insbesondere einem Mikroschalter, mit zumindest einer durch ein Betätigungsglied in verschiedene Schaltstellungen überführbaren Kontaktfeder, welche an einem als elektrischer Kontakt ausgebildeten Anker angeordnet ist, ist nach der Erfindung vorgesehen, dass die Kontaktfeder einen geschlossenen Federrahmen aufweist, das am Federrahmen zwei, sich in etwa gegenläufige Richtungen erstreckende Federzungen biegeweich angeordnet sind, wobei die erste Federzunge als Rücksteller für das Betätigungsglied ausgebildet ist, und die zweite Federzunge die Umschaltfunktion des Kontaktbereiches der Kontaktfeder steuert, und dass die Federzungen an voneinander abgewandten Flächenbereichen des Ankers abstützend eingreifen, derart, dass die Kontaktfeder eine dauerhafte stabile Lage während ihrer Betätigung aufweist.In an electrical switch, in particular a microswitch, with at least one contact spring, which can be converted into different switch positions by an actuator, which is arranged on an armature formed as an electrical contact, it is provided according to the invention that the contact spring has a closed spring frame, the spring frame two , Be arranged in approximately opposite directions extending spring tongues pliable, wherein the first spring tongue is formed as a return for the actuator, and the second spring tongue controls the switching function of the contact region of the contact spring, and that the spring tongues engage abutting surface areas of the armature so supporting in that the contact spring has a permanent stable position during its actuation.

Mit Hilfe eines erfindungsgemäß ausgebildeten Mikroschalters, dessen Kontaktfeder über zwei, insbesondere aneinander gegenüberliegenden Enden des Federrahmens einstückig angeordneten Federzungen am stromführenden Anker des Schalters abstützend angreifen, ist selbst bei der während des gesamten Schaltvorganges erzeugten Kippbewegung der Kontaktfeder eine stabile Lage der Kontaktfeder innerhalb des Mikroschalters gewährleistet. Des weiteren entsteht beim Schaltvorgang der lagestabil aufgenommenen Kontaktfeder, aufgrund der verringerten Tangentialbewegung in der Kontaktstelle, eine reduzierte Kontaktreibung, was die Längszeitfunktion des Schalters mit Vorteil verbessert. Auf die Ausbildung einer die Kontaktfeder beispielsweise haltenden, stets reibungsbehafteten Schiebeführung kann somit auf vorteilhafte Weise verzichtet werden und der erfindungsgemäße Schalter weist dementsprechend eine vereinfachte und somit kostengünstige Ausgestaltung auf. Bereits während der Montage des Schalters ist die sich dann lediglich am Anker und einem Kontakt abstützende Kontaktfeder lagestabil gehalten. Die Federzungen der Kontaktfeder verlaufen dabei in einem Mittenbereich des darum geschlossen ausgebildeten Federrahmens, vorzugsweise jeweils von dessen Endbereichen ausgehend, etwa in entgegengesetzte Richtungen zueinander.With the help of an inventively designed microswitch whose contact spring on two, in particular opposite ends of the spring frame integrally arranged spring tongues on the current-carrying armature of the switch attacking support, even in the generated during the entire switching operation tilting movement of the contact spring a stable position of the contact spring is ensured within the microswitch , Furthermore, arises during the switching operation of the stable position recorded contact spring, due to the reduced tangential movement in the Contact point, a reduced contact friction, which improves the long-term function of the switch with advantage. On the formation of the contact spring, for example, holding, always frictional sliding guide can thus be dispensed with in an advantageous manner and the switch according to the invention accordingly has a simplified and therefore cost-effective design. Already during assembly of the switch which is then only stable at the anchor and a contact supporting contact spring. The spring tongues of the contact spring extend in a central region of the spring frame formed closed around it, preferably each starting from the end regions, approximately in opposite directions to each other.

Mit Vorteil ist nach einer Weiterbildung der Erfindung vorgesehen, dass die erste, als Rücksteller für das Betätigungsglied ausgebildete Federzunge ein zumindest in ihrer Längsrichtung auf Druckspannung belastetes, ausgeknicktes Federblatt ist. Der Einsatz eines Federblattes stellt eine konstruktiv vorteilhafte Möglichkeit zur Ausbildung der bevorzugt biegeweich aufgenommenen, ersten Federzunge dar. Die sich zugleich im Knickfall befindliche Federzunge erzeugt zudem eine degressive Federkennlinie bei der Betätigung, wodurch der Verschleiß am Betätigungsglied, welches beispielsweise als Stößel ausgebildet sein kann, selbst bei relativ großen Verfahrwegen mit Vorteil gering gehalten werden kann. Mit der Verwendung eines Federblattes ist darüber hinaus sichergestellt, dass neben der vorteilhaften Rückstellfunktion für das Betätigungsglied gleichzeitig eine der zweiten Federzunge entgegenwirkende Federkraft erzeugt ist, mittels der ein vorteilhaftes Gleichgewicht der jeweils in entgegengesetzte Richtungen wirkenden Federkräfte der Federzungen geschaffen ist.According to a further development of the invention, it is advantageously provided that the first spring tongue formed as a return spring for the actuating member is a folded-out spring leaf loaded with compressive stress at least in its longitudinal direction. The use of a spring leaf provides a structurally advantageous possibility for forming the preferably flexibly received, first spring tongue. The spring tongue also located in buckling case also generates a degressive spring characteristic during actuation, whereby the wear on the actuator, which may be formed, for example, as a plunger even with relatively large travel distances can be kept low with advantage. With the use of a spring leaf is also ensured that in addition to the advantageous return function for the actuator at the same time one of second spring tongue counteracting spring force is generated, by means of which an advantageous balance of each acting in opposite directions spring forces of the spring tongues is created.

Die erste Federzunge weist vorzugsweise in einer der Schaltstellungen der Kontaktfeder einen sich vom Anlenkpunkt am Federrahmen aus erstreckend, etwa parallel zur Federrahmenebene verlaufenden Schenkelabschnitt auf, an dem sich mindestens ein weiterer Schenkelabschnitt mit einem ungefähr gleichmäßig gekrümmten Verlauf anschließt. Das sich dabei in seiner Ruhelage bzw. der oberen Endlage befindliche Betätigungsglied wird durch die stets elastisch verformte Federzunge dauerhaft mit einer Federkraft beaufschlagt. Bei der Betätigung des Betätigungsgliedes führt insbesondere der Federrahmen der Kontaktfeder eine Kippbewegung aus. Die als Rücksteller ausgebildete Federzunge wird durch die auf sie einwirkende, erhöhende Druckspannung weiter ausgeknickt und kann nach Erreichen der unteren Endlage Schenkelabschnitte aufweisen, die sowohl unterschiedliche Krümmungsradien als auch unterschiedliche Krümmungsrichtungen haben.The first spring tongue preferably has, in one of the switching positions of the contact spring, a leg section extending from the articulation point on the spring frame, approximately parallel to the spring frame plane, followed by at least one further leg section having an approximately uniformly curved course. The actuator located in its rest position or the upper end position is permanently acted upon by the always elastically deformed spring tongue with a spring force. Upon actuation of the actuator, in particular, the spring frame of the contact spring performs a tilting movement. Trained as a retractor spring tongue is further buckled by acting on them, increasing compressive stress and may have after reaching the lower end leg leg sections that have both different radii of curvature and different directions of curvature.

Darüber hinaus ist vorgesehen, dass die zweite Federzunge der Kontaktfeder eine gebogene Formgebung aufweist. Mittels einer bevorzugt plastisch verformten Federzunge ist eine vorteilhaft verbesserte Umschaltfunktion bzw. Schnappbewegung der zweiten Federzunge bewirkt, welche nach Erreichen der Schaltlage durch das Betätigungsglied schlagartig einen Wechsel in der Schaltstellung des Kontaktbereiches der Kontaktfeder ausführt. Die zweite Federzunge weist im Gegensatz zur ersten Federzunge dabei insbesondere eine relativ steife Ausgestaltung auf bzw. hat eine knicksteifere Geometrie, wodurch selbst bei einer relativ hohen, in Längsrichtung der Federzunge wirkenden Druckkraft ein Übergang in den Knickfall mit Vorteil verhindert ist. Anstelle einer gebogenen oder abgewinkelten Form kann die zweite Federzunge selbstverständlich auch gerade ausgebildet sein.In addition, it is provided that the second spring tongue of the contact spring has a curved shape. By means of a preferably plastically deformed spring tongue, an advantageously improved switching function or snap movement of the second spring tongue is effected, which after reaching the switching position by the actuating member abruptly performs a change in the switching position of the contact region of the contact spring. The second In contrast to the first spring tongue, the spring tongue has, in particular, a relatively stiff configuration or has a kink-stiffener geometry, whereby a transition into the buckling case is advantageously prevented even with a relatively high pressure force acting in the longitudinal direction of the spring tongue. Instead of a bent or angled shape, the second spring tongue can of course also be straight.

Die erste Federzunge weist im Verhältnis zur zweiten Federzunge bei etwa gleichem Querschnitt ein größeres Längenmaß auf, wodurch insbesondere sichergestellt ist, dass lediglich nur eine der mit dem Federrahmen der Kontaktfeder insbesondere einstückig ausgebildeten Federzungen bei einer in Längsrichtung der Federzunge wirkenden Druckkraft ausknickt. Dieses wirkt sich mit Vorteil weiter verbessernd auf die stabile Lage der Kontaktfeder innerhalb des Mikroschalters trotz der ungeführten Bewegung der Kontaktfeder aus. Vorzugsweise ist das Längenmaß der ersten Federzunge mindestens doppelt so lang wie das Längenmaß der zweiten Federzunge.The first spring tongue has in relation to the second spring tongue at approximately the same cross-section on a larger length, which in particular ensures that only one of the spring frame of the contact spring in particular integrally formed spring tongues buckles at a force acting in the longitudinal direction of the spring pressure force. This has an advantageous effect on improving the stable position of the contact spring within the microswitch despite the ungauged movement of the contact spring. Preferably, the length dimension of the first spring tongue is at least twice as long as the length dimension of the second spring tongue.

Nach einer Weiterbildung der Erfindung ist vorgesehen, dass jede Federzunge im Bereich ihrer Anlenkung am Federrahmen eine ihren Querschnitt verringernde Einschnürung aufweist. Über die Einschnürungen in den Anlenkbereichen am Federrahmen ist eine vorteilhaft gelenkähnliche Anbindung der Federzungen an den sonst relativ steif ausgebildeten Federrahmen der Kontaktfeder erzeugt. Zum einen ist dadurch eine optimale Verformung der ausgeknickten, ersten Federzunge in Abhängigkeit von der Schaltposition der Kontaktfeder erzielt und zum anderen lässt sich der Differenzweg zwischen Schaltlage und Rückschaltlage mit Vorteil reduzieren. Somit ist gleichzeitig der für den Umschaltvorgang notwendige Verfahrweg minimiert, was sich wiederum vorteilhaft auf das Schaltverhalten eines derartig erfindungsgemäß ausgebildeten elektrischen Schalters auswirkt.According to a development of the invention, it is provided that each spring tongue in the region of its articulation on the spring frame has a constriction which reduces its cross-section. About the constrictions in the articulation areas on the spring frame an advantageous joint-like connection of the spring tongues to the otherwise relatively stiff formed spring frame of the contact spring is generated. On the one hand this is an optimal deformation of the buckled, first spring tongue in response to the Switching position of the contact spring achieved and on the other hand, the differential path between switching position and Rückschaltlage reduce with advantage. Thus, at the same time necessary for the switching path is minimized, which in turn has an advantageous effect on the switching behavior of such inventively designed electrical switch.

Der Kontaktbereich der Kontaktfeder, welcher der den Umschaltvorgang steuernden, zweiten Federzunge zugeordnet ist, ist als aufgerollter Hohlformabschnitt ausgebildet, was eine vorteilhaft einfache Möglichkeit zur Ausbildung des jeweils mit den Kontakten des Mikroschalters in Anlage bringbaren Kontaktbereiches darstellt. Des weiteren ist durch die Ausbildung des Kontaktbereiches als Hohlformabschnitt und der sich daraus ergebenden relativ geringen Masse, während des Umschaltvorganges ein vorteilhaft schwingungsarmes Aufsetzen der Oberfläche des Kontaktbereiches auf eine jeweilige Kontaktfläche des Mikroschalters gewährleistet. Der als Hohlformabschnitt ausgebildete Kontaktbereich ist insbesondere an einem Endbereich des Federrahmens angeordnet, von dem aus sich die zweite Federzunge ungefähr in Richtung des gegenüberliegenden Endes erstreckt.The contact region of the contact spring, which is assigned to the second spring tongue controlling the switching process, is designed as a rolled-up hollow mold section, which represents an advantageously simple possibility for forming the contact region which can be brought into contact with the contacts of the microswitch. Furthermore, it is ensured by the formation of the contact region as a hollow mold section and the resulting relatively low mass, during the switching operation, an advantageous low-vibration placement of the surface of the contact area to a respective contact surface of the microswitch. The formed as a hollow mold portion contact area is arranged in particular at an end portion of the spring frame, from which extends the second spring tongue approximately in the direction of the opposite end.

Um den Differenzweg zwischen der Schaltlage und der Rückschaltlage, der sich gelenkig am Anker abstützenden Kontaktfeder weiter zu verringern, ist vorgesehen, dass der Anlenkpunkt für die zweite Federzunge im aufgerollten Hohlformabschnitt der Kontaktfeder ausgebildet ist. Die Anbindung der zweiten Federzunge erfolgt vorzugsweise in einem Bereich oberhalb der Federrahmenebene, wodurch insbesondere die Rückschaltlage bzw. der Rückschaltpunkt mit Vorteil in Richtung der Schaltlage bzw. des Schaltpunktes verschoben ist. Somit lässt sich das Schaltverhalten des als Mikroschalter ausgebildeten elektrischen Schalters relativ einfach verbessern, wobei stets angestrebt wird, den Differenzweg zwischen Schalt- und Rückschaltlage gegen null zu führen.In order to further reduce the difference between the switching position and the Rückschaltlage, the articulated at the armature supporting contact spring, it is provided that the articulation point is formed for the second spring tongue in the rolled-up hollow mold portion of the contact spring. The connection of the second spring tongue is preferably in an area above the Federrahmenebene, whereby in particular the Rückschaltlage or the reset point is shifted with advantage in the direction of the switching position and the switching point. Thus, the switching behavior of the electrical switch designed as a microswitch can be relatively easily improved, whereby the aim is always to bring the differential path between the switching and reset position to zero.

Eine andere Weiterbildung der Erfindung sieht vor, dass die Federzungen, welche bevorzugt an einander gegenüberliegenden Enden der Kontaktfeder angeordnet sind, an parallel zueinander versetzt angeordneten Abschnitten des insbesondere abgewinkelt ausgebildeten Ankers angreifen. Durch die Ausbildung des gleichzeitig als elektrischer Kontakt dienenden Ankers als stufenförmig abgewinkeltes Bauteil kann mit Vorteil auf die Stauchung eines Abschnittes des Federrahmens verzichtet werden. Insbesondere die gleichzeitig mit der Stauchung des Federrahmens, was durch eine plastische Umformung am Federrahmen bewirkt ist, auftretenden Ungenauigkeiten im Umformbereich können somit vermieden und ein erfindungsgemäßer Mikroschalter mit einer relativ hohen Schaltgenauigkeit hergestellt werden. Zudem bedarf die plastische Verformung des Federrahmens stets eines relativ hohen fertigungstechnischen Aufwandes, auf den nunmehr durch die abgewinkelte Ausbildung des Ankers mit Vorteil verzichtet werden kann. Der abgewinkelte Anker lässt sich hingegen mit einer vorteilhaft hohen Genauigkeit relativ einfach modifizieren.Another development of the invention provides that the spring tongues, which are preferably arranged at opposite ends of the contact spring, engage parallel to each other staggered portions of the particular angled trained anchor. By forming the same time serving as an electrical contact armature as a step-shaped component can be dispensed with advantage to the compression of a portion of the spring frame. In particular, the inaccuracies in the forming area occurring simultaneously with the compression of the spring frame, which is caused by a plastic deformation on the spring frame, can thus be avoided and a microswitch according to the invention can be produced with a relatively high switching accuracy. In addition, the plastic deformation of the spring frame always requires a relatively high manufacturing effort, can now be dispensed with by the angled design of the armature with advantage. The angled anchor, however, can be relatively easily modified with a favorable high accuracy.

Ein Ausführungsbeispiel der Erfindung, aus dem sich weitere erfinderische Merkmale ergeben, ist in der Zeichnung dargestellt. Es zeigen:

Fig. 1:
eine perspektivische Ansicht eines nicht betätigten Mikroschalters im Schnitt;
Fig. 2:
eine Ansicht des betätigten Mikroschalters nach Fig. 1 im Schnitt;
Fig. 3:
eine Ansicht eines ersten Ausführungsbeispiels einer im Mikroschalter verwendeten Kontaktfeder, und
Fig. 4:
eine Ansicht eines weiteren Ausführungsbeispiels einer im Mikroschalter eingesetzten Kontaktfeder.
An embodiment of the invention, from which further inventive features arise, is shown in the drawing. Show it:
Fig. 1:
a perspective view of a non-actuated microswitch in section;
Fig. 2:
a view of the actuated microswitch after Fig. 1 on average;
3:
a view of a first embodiment of a contact spring used in the microswitch, and
4:
a view of another embodiment of a contact spring used in the microswitch.

Mit 1 ist ein Mikroschalter bezeichnet, der zumindest ein Gehäuse 2 und ein das Gehäuse durchdringendes Betätigungsglied 3 aufweist, welches wiederum in Anlage mit einer in verschiedene Schaltstellungen überführbaren Kontaktfeder 4 steht. Die Kontaktfeder 4 weist einen geschlossenen Federrahmen 5 auf, an dem zwei, sich in etwa gegenläufige Richtungen erstreckende Federzungen 6, 7 biegeweich angeordnet sind. Die Federzungen 6, 7 sind insbesondere einstückig mit dem Federrahmen 5 ausgebildet, und stützen sich zu beiden Seiten an einem als elektrischer Kontakt ausgebildeten Anker 8 ab. Eine erste Federzunge 6 ist dabei ein zumindest in ihrer Längsrichtung auf Druckspannung belastetes, ausgeknicktes Federblatt, welches zudem als Rücksteller für das Betätigungsglied 3 dient. Die zweite Federzunge 7 steuert insbesondere die Umschaltfunktion eines an der Kontaktfeder 4 ausgebildeten Kontaktbereiches 9, welcher bei einer entsprechenden Betätigung der Kontaktfeder 4 zwischen einem Oberkontakt 10 und einem Unterkontakt 11 hin- und herschaltet. Dabei führt die zweite Federzunge beim Erreichen der Schaltlage oder der Rückschaltlage durch das Betätigungsglied 3 stets eine spontane und eindeutige Umklappbewegung aus.1 with a micro-switch is referred to, which has at least one housing 2 and a housing 3 penetrating actuator 3, which in turn is in contact with a convertible into different switching positions contact spring 4. The contact spring 4 has a closed spring frame 5, are arranged on the two, approximately in opposite directions extending spring tongues 6, 7 pliable. The spring tongues 6, 7 are in particular formed integrally with the spring frame 5, and are supported on both sides on an electrical contact Anchor 8 off. In this case, a first spring tongue 6 is an unfolded spring leaf which is loaded at least in its longitudinal direction and which also serves as a return spring for the actuating member 3. In particular, the second spring tongue 7 controls the switching function of a contact region 9 formed on the contact spring 4, which switches back and forth between a top contact 10 and a bottom contact 11 upon a corresponding actuation of the contact spring 4. In this case, the second spring tongue always leads on reaching the switching position or the Rückschaltlage by the actuator 3 a spontaneous and unambiguous Umklappbewegung.

In Fig. 2 ist der betätigte Mikroschalter 1 gezeigt, wobei das als Stößel ausgebildete Betätigungsglied 3 in seiner Endlage steht. Die Kontaktfeder 4 hat dann eine Kippbewegung ausgeführt, und liegt mit ihrem Kontaktbereich 9 auf dem Unterkontakt 11 auf. Die erste Federzunge 6 ist durch die in ihrer Längsrichtung erhöhte Druckspannung weiter ausgeknickt, wobei die Federzunge 6 jedoch nur elastisch verformt wird und somit nach Wegnahme der auf das Betätigungsglied 3 einwirkenden Kraft dieses selbsttätig durch die erste Federzunge 6 in seine Ruhelage (Fig. 1) zurückbewegt wird. Gleichzeitig schaltet dann die zweite Federzunge 7 in ihre obere Schaltstellung zurück, so dass der Kontaktbereich 9 der Kontaktfeder 4 wiederum am Oberkontakt 10 anliegt. Der stromführende Anker 8 ist abgewinkelt ausgebildet, so dass die freien Enden der Federzungen 6, 7 an parallel zueinander versetzt verlaufenden Abschnitten 12, 13 des Ankers 8 abstützend angreifen. Um insbesondere das Eindringen von Feuchtigkeit über die das Betätigungsglied 3 führende Öffnung 14 zu verhindern, ist insbesondere ein den Öffnungsbereich abdichtend verschließender Balg 15 vorgesehen, der am Gehäuse 2 und dem Betätigungsglied 3 formschlüssig angeformt ist.In Fig. 2 the actuated micro-switch 1 is shown, wherein the actuator designed as a plunger 3 is in its end position. The contact spring 4 has then carried out a tilting movement, and lies with its contact region 9 on the lower contact 11. The first spring tongue 6 is further buckled by the increased compressive stress in its longitudinal direction, but the spring tongue 6 is deformed only elastically and thus after removal of the force acting on the actuator 3 this automatically by the first spring tongue 6 in its rest position ( Fig. 1 ) is moved back. At the same time then switches the second spring tongue 7 in its upper switching position, so that the contact portion 9 of the contact spring 4 in turn rests on the upper contact 10. The current-carrying armature 8 is angled so that the free ends of the spring tongues 6, 7 engage supportingly at parallel staggered sections 12, 13 of the armature 8. Around In particular, to prevent the ingress of moisture via the actuating member 3 leading to the opening 14, in particular a sealing region sealingly closing the opening portion 15 is provided, which is integrally formed on the housing 2 and the actuator 3 in a form-fitting manner.

Fig. 3 zeigt insbesondere die im Mikroschalter 1 zum Einsatz kommende Kontaktfeder 4 in vergrößerter Ansicht, um insbesondere deren Ausgestaltung zu verdeutlichen. Die Kontaktfeder 4 ist dabei im Einbauzustand dargestellt, so dass die erste Federzunge 6 aus ihrer eigentlichen in der Ebene des Federrahmens 5 liegenden Ruhelage herausgeführt dargestellt ist. Der Federrahmen 5 der Kontaktfeder 4 weist an einem Ende eine stets mit dem Betätigungsglied 3 (Fig. 1) in Anlage stehende Aufsetzfläche 16 auf, die aufgrund der durch die Kontaktfeder ausführenden Kippbewegung gewölbt ausgebildet ist. Am gegenüberliegenden Ende des Federrahmens 5 ist der jeweils mit dem Oberkontakt 10 oder dem Unterkontakt 11 in Anlage stehende Kontaktbereich 9 ausgebildet, welcher vorzugsweise ein aufgerollter Hohlformabschnitt ist. Des weiteren weist die erste Federzunge 6 im Verhältnis zur zweiten Federzunge 7 wenigstens die zweifache Länge auf, so dass sichergestellt ist, dass lediglich die erste Federzunge 6 bei einer in ihrer Längsrichtung wirkenden Druckspannung ausknickt. Die zweite Federzunge 7 ist trotz ihrer biegeweichen Anlenkung am Federrahmen 5 stets relativ stabil und weist, wie Fig. 3 verdeutlicht, bereits im Anlieferzustand eine gebogene Formgebung auf, was bei Erreichen der Schaltlage stets zu einem spontanen bzw. schlagartigen Umschalten der zweiten Federzunge 7 führt. Fig. 3 shows in particular the coming into use in microswitch 1 contact spring 4 in an enlarged view, in particular to illustrate their design. The contact spring 4 is shown in the installed state, so that the first spring tongue 6 is shown led out of its actual resting in the plane of the spring frame 5 rest position. The spring frame 5 of the contact spring 4 has at one end always with the actuator 3 ( Fig. 1 ) in contact bearing surface 16, which is formed curved due to the export by the contact spring tilting movement. At the opposite end of the spring frame 5 of each standing with the upper contact 10 or the lower contact 11 in contact contact area 9 is formed, which is preferably a rolled-up hollow mold section. Furthermore, the first spring tongue 6 in relation to the second spring tongue 7 at least twice the length, so that it is ensured that only the first spring tongue 6 buckles at a compressive stress acting in its longitudinal direction. The second spring tongue 7 is always relatively stable in spite of their flexurally flexible articulation on the spring frame 5 and has, as Fig. 3 illustrates already in the delivery state a curved shape, which always leads to a spontaneous or sudden switching of the second spring tongue 7 when reaching the switching position.

Fig. 4 zeigt ein zweites Ausführungsbeispiel einer erfindungsgemäßen Kontaktfeder 17, die insbesondere mit einer aus der Ebene des Federrahmens 5 herausknickenden, biegeweich geformten, jedoch gerade verlaufenden zweiten Federzunge 18 ausgerüstet ist. Gleiche Bauteile sind mit gleichen Bezugszahlen bezeichnet. Fig. 4 shows a second embodiment of a contact spring 17 according to the invention, which is in particular equipped with a bending out of the plane of the spring frame 5, bend soft-shaped, but straight extending second spring tongue 18. Identical components are designated by the same reference numbers.

Claims (9)

Elektrischer Schalter, insbesondere Mikroschalter, mit zumindest einer durch ein Betätigungsglied in verschiedene Schaltstellungen überführbaren Kontaktfeder, welche an einem als elektrischer Kontakt ausgebildeten Anker angeordnet ist,
dadurch gekennzeichnet,
dass die Kontaktfeder (4, 17) einen geschlossenen Federrahmen (5) aufweist, dass am Federrahmen (5) zwei, sich in etwa gegenläufige Richtungen erstreckende Federzungen (6, 7, 18) biegeweich angeordnet sind, wobei eine erste Federzunge (6) als Rücksteller für das Betätigungsglied (3) ausgebildet ist, und eine zweite Federzunge (7, 18) die Umschaltfunktion des Kontaktbereiches (9) der Kontaktfeder (4, 17) steuert, und
dass die Federzungen (6, 7, 18) an voneinander abgewandten Flächenbereichen des Ankers (8) abstützend angreifen, derart, dass die Kontaktfeder (4, 17) eine dauerhaft stabile Lage während des Betätigens aufweist.Electrical switch, in particular a microswitch, with at least one contact spring, which can be converted into different switch positions by an actuator, which is arranged on an armature formed as an electrical contact,
characterized,
in that the contact spring (4, 17) has a closed spring frame (5), that flexible spring tongues (6, 7, 18) extending in approximately opposite directions are arranged on the spring frame (5), wherein a first spring tongue (6) as Reset for the actuator (3) is formed, and a second spring tongue (7, 18) controls the switching function of the contact region (9) of the contact spring (4, 17), and
that the spring tongues (6, 7, 18) on opposite surface regions of the armature (8) engage supporting manner such that the contact spring (4, 17) has a permanently stable position during actuation. Elektrischer Schalter nach Anspruch 1, dadurch gekennzeichnet, dass die erste, als Rücksteller ausgebildete Federzunge (6) ein zumindest in ihrer Längsrichtung auf Druckspannung belastetes, ausgeknicktes Federblatt ist.Electrical switch according to claim 1, characterized in that the first spring tongue (6) designed as a reset device is a bent spring leaf loaded with compressive stress at least in its longitudinal direction. Elektrischer Schalter nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die erste Federzunge (6) einen sich vom Anlenkpunkt am Federrahmen (5) aus erstreckend, etwa parallel zur Federrahmenebene verlaufenden Schenkelabschnitt aufweist, an dem sich mindestens ein weiterer Schenkelabschnitt mit einem ungefähr gleichmäßig gekrümmten Verlauf anschließt.Electric switch according to claim 1 or 2, characterized in that the first spring tongue (6) extending from the articulation point on the spring frame (5) extending approximately parallel to the spring frame plane leg portion, at which at least one further leg portion with an approximately uniformly curved Course connects. Elektrischer Schalter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die zweite Federzunge (7) eine gebogene Formgebung aufweist.Electric switch according to one of claims 1 to 3, characterized in that the second spring tongue (7) has a curved shape. Elektrischer Schalter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Längenmaß der ersten Federzunge (6) größer ist als das Längenmaß der zweiten Federzunge (7, 18).Electric switch according to one of claims 1 to 4, characterized in that the length dimension of the first spring tongue (6) is greater than the length dimension of the second spring tongue (7, 18). Elektrischer Schalter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass jede Federzunge (6, 7, 18) im Bereich ihrer Anlenkung am Federrahmen (5) eine ihren Querschnitt verringernde Einschnürung aufweist.Electrical switch according to one of claims 1 to 5, characterized in that each spring tongue (6, 7, 18) in the region of its articulation on the spring frame (5) has a constriction reducing its cross-section. Elektrischer Schalter nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der der zweiten Federzunge (7, 18) zugeordnete Kontaktbereich (9) der Kontaktfeder (4, 17) als aufgerollter Hohlformabschnitt ausgebildet ist.Electric switch according to one of claims 1 to 6, characterized in that the second spring tongue (7, 18) associated contact region (9) of the contact spring (4, 17) is designed as a rolled-up hollow mold section. Elektrischer Schalter nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Anlenkpunkt für die zweite Federzunge (7, 18) im aufgerollten Hohlformabschnitt der Kontaktfeder (4, 17) ausgebildet ist.Electrical switch according to one of claims 1 to 7, characterized in that the articulation point for the second spring tongue (7, 18) in the rolled-up hollow mold portion of the contact spring (4, 17) is formed. Elektrischer Schalter nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Federzungen (6, 7, 18) der Kontaktfeder (4, 17) an parallel zueinander versetzt angeordneten Abschnitten (12, 13) des abgewinkelt ausgebildeten Ankers (8) angreifen.Electric switch according to one of Claims 1 to 8, characterized in that the spring tongues (6, 7, 18) of the contact spring (4, 17) act on sections (12, 13) of the angled armature (8) that are offset parallel to one another.
EP09008713.1A 2008-07-26 2009-07-03 Microswitch Active EP2148344B1 (en)

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DE102013018448A1 (en) 2013-11-05 2015-05-21 Johnson Electric Germany GmbH & Co. KG snap-action switch
CN110176372B (en) * 2019-05-31 2021-10-22 无锡市创新开关电器有限公司 Sealed DC microswitch

Citations (4)

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Publication number Priority date Publication date Assignee Title
FR2472827A1 (en) * 1979-12-26 1981-07-03 Crouzet Sa Snap action switch with mobile leaf - biassed against one of two contacts by two central arms sitting in notches in common terminal
DE8915158U1 (en) * 1989-12-23 1990-02-08 Grässlin KG, 7742 St. Georgen Snap spring for an electrical switch with two defined switching positions, in particular for a so-called microswitch
DE29615991U1 (en) * 1996-09-14 1998-01-22 Hans-Georg Hartmann Kg, 73614 Schorndorf Switching spring
DE19745803C1 (en) * 1997-10-16 1999-07-01 Inovan Stroebe Contact spring for microswitch

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Publication number Priority date Publication date Assignee Title
DE9305074U1 (en) * 1993-04-02 1993-06-09 Schaltbau AG, 8000 München Microswitch
DE102004035193A1 (en) * 2004-07-21 2006-02-16 Schaltbau Gmbh microswitch
DE102006043795B3 (en) * 2006-09-19 2008-05-29 Saia-Burgess Oldenburg Gmbh & Co. Kg Electric microswitch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2472827A1 (en) * 1979-12-26 1981-07-03 Crouzet Sa Snap action switch with mobile leaf - biassed against one of two contacts by two central arms sitting in notches in common terminal
DE8915158U1 (en) * 1989-12-23 1990-02-08 Grässlin KG, 7742 St. Georgen Snap spring for an electrical switch with two defined switching positions, in particular for a so-called microswitch
DE29615991U1 (en) * 1996-09-14 1998-01-22 Hans-Georg Hartmann Kg, 73614 Schorndorf Switching spring
DE19745803C1 (en) * 1997-10-16 1999-07-01 Inovan Stroebe Contact spring for microswitch

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DE102008035043A1 (en) 2010-02-04
PL2148344T3 (en) 2017-08-31
DE102008035043B4 (en) 2013-04-04
CN101685719B (en) 2014-08-20
HUE028763T2 (en) 2017-01-30
EP2148344A3 (en) 2010-08-25
CN101685719A (en) 2010-03-31
EP2148344B1 (en) 2016-02-10

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