EP3244430B1 - Device for converting mechanical movements into an electrical switching signal - Google Patents

Device for converting mechanical movements into an electrical switching signal Download PDF

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Publication number
EP3244430B1
EP3244430B1 EP16168708.2A EP16168708A EP3244430B1 EP 3244430 B1 EP3244430 B1 EP 3244430B1 EP 16168708 A EP16168708 A EP 16168708A EP 3244430 B1 EP3244430 B1 EP 3244430B1
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EP
European Patent Office
Prior art keywords
snap
switching signal
housing
piezoelectric element
accordance
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EP16168708.2A
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German (de)
French (fr)
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EP3244430A1 (en
Inventor
Volker Knüppel
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Rafi GmbH and Co KG
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Rafi GmbH and Co KG
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Priority to EP16168708.2A priority Critical patent/EP3244430B1/en
Publication of EP3244430A1 publication Critical patent/EP3244430A1/en
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    • 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
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button
    • H01H13/18—Operating parts, e.g. push-button adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H01H13/183—Operating parts, e.g. push-button adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift for actuation by moving a closing member, e.g. door, cover
    • 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
    • H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards

Definitions

  • the invention relates to a device for converting mechanical feed movements into an electrical switching signal, by means of which an electrical device, for example a machine tool, a telephone or the like, can be controlled or operated, according to the preamble of patent claim 1.
  • Such devices are used as an interface between man and machine or device in use and usually consist of a plurality of actuators, which are held axially guided in a recess incorporated in a housing.
  • the individual actuating elements act on a snap disk supported on the housing, which is arched in the direction of the actuating element and is made of an electrically conductive metallic material.
  • the domes are therefore biased and are moved when moving down the actuator in the direction of a circuit board provided on a switching contact.
  • the snap disc has the property that it undergoes an opposite bulge when bending compared to their starting position and when snapping the snap disc a switching signal is electrically detectable.
  • the snap-action disc Upon actuation of the snap-action disc, the latter generates an electrical connection with the opposite switching contact, so that a short-circuit arises, which is detected and processed by an electrical evaluation and control device. As soon as a corresponding short circuit is detected by the evaluation and control unit, the electrical device or the machine tool can be controlled accordingly.
  • an electrical evaluation and control device As soon as a corresponding short circuit is detected by the evaluation and control unit, the electrical device or the machine tool can be controlled accordingly.
  • FIGS. 1a and 1b a device 1 is shown, through which a manual or mechanically generated feed movement can be generated in an electrical switching signal 12, through which an electrical device, such as a machine tool, a telephone, a kitchen appliance or the like, can be operated.
  • an electrical device such as a machine tool, a telephone, a kitchen appliance or the like
  • the device 1 consists of a housing 3, in which at least one recess 4 is incorporated.
  • an actuating element 5 is mounted axially movable, which is formed from an externally accessible actuating plunger 6 and a spherical membrane 8.
  • the actuating plunger 6 is according to FIG. 1b 2 acted upon with a delivery force, so that it is pressed or retracted into the interior of the housing 3.
  • the actuating plunger 6 rests on the spherical membrane 8, which is fixedly coupled to the housing 3.
  • the ball membrane 8 rests on the top side of a snap-action disc 9, which is dome-shaped or dome-shaped in the direction of the actuating element 5 in the unactuated state according to FIG FIG. 1a is bulged.
  • the snap disc 9 is made of an electrically conductive metallic material.
  • the snap disc 9 has a bias, similar to a helical compression spring in the tensioned state, which counteracts the feed force 2.
  • a circuit board 10 is provided, on which an electrical contact surface 11 is provided.
  • the button 11 is arranged below the respective snap disc 9.
  • the snap disc 9 is pressed by the feed force 2 in the direction of the button 11 and snaps the snap disc 9, it is connected to the switching contact on the circuit board 11 in the form of a short circuit, so that an electrical switching signal 12 is generated.
  • the resistance force which acts from the snap disk 9 against the feed force 2, considerably reduced, since this falls almost to zero.
  • Due to the drop in the feed force 2 due to the snap action of the snap disk 9, a pulse signal 22 generated by a piezoelectric element 21 is produced. Both the switching signal 12 and the pulse signal 22 are detected by an evaluation and control device 13.
  • the switching signal 12 is used to control an electrical device and the signal 22 as a redundant electrical pulse in such a way that the pulse signal 22 instantaneously to the time of snapping the snap disk 9 following the switching signal 12 is formed. Even with a slight time difference between the generation of the switching signal 12 and the formation of the pulse signal 22, the switching signal 12 is not passed from the evaluation and control device 13 to the electrical device or forwarded.
  • the pulse signal 22 thus serves for the redundant verification of the generation of the switching signal 12.
  • FIGS. 1a and 1b is the respective piezo-element 21 mounted on the actuating plunger 6.
  • the piezoelectric element 21 provided in the region of the housing and designed annular or parallelepiped.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Push-Button Switches (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Umwandlung von mechanischen Zustellbewegungen in ein elektrisches Schaltsignal, durch das ein elektrisches Gerät, beispielsweise eine Werkzeugmaschine, ein Telefon oder dergleichen, gesteuert bzw. bedient werden kann, nach dem Oberbegriff des Patentanspruches 1.The invention relates to a device for converting mechanical feed movements into an electrical switching signal, by means of which an electrical device, for example a machine tool, a telephone or the like, can be controlled or operated, according to the preamble of patent claim 1.

Derartige Vorrichtungen sind als Schnittstelle zwischen Mensch und Maschine bzw. Gerät im Einsatz und bestehen üblicherweise aus einer Vielzahl von Betätigungselementen, die axial geführt gehalten in einer in einem Gehäuse eingearbeiteten Aussparung angeordnet sind. Die einzelnen Betätigungselemente wirken auf eine an dem Gehäuse abgestützte Schnappscheibe, die in Richtung des Betätigungselementes gewölbt ist und aus einem elektrisch leitfähigen metallischen Werkstoff hergestellt ist. Die Schnappscheiben sind demnach vorgespannt und werden beim Runterfahren des Betätigungselementes in Richtung eines auf einer Leiterplatte vorgesehenen Schaltkontaktes bewegt. Die Schnappscheibe weist die Eigenschaft auf, dass diese beim Durchbiegen eine entgegengesetzte Auswölbung im Vergleich zu deren Ausgangsposition erfährt und beim Durchschnappen der Schnappscheibe ein Schaltsignal elektrisch detektierbar wird.Such devices are used as an interface between man and machine or device in use and usually consist of a plurality of actuators, which are held axially guided in a recess incorporated in a housing. The individual actuating elements act on a snap disk supported on the housing, which is arched in the direction of the actuating element and is made of an electrically conductive metallic material. The domes are therefore biased and are moved when moving down the actuator in the direction of a circuit board provided on a switching contact. The snap disc has the property that it undergoes an opposite bulge when bending compared to their starting position and when snapping the snap disc a switching signal is electrically detectable.

Beim Betätigen der Schnappscheibe erzeugt diese eine elektrische Verbindung mit dem gegenüberliegendenSchaltkontakt, so dass ein Kurzschluss entsteht, der von einer elektrischen Auswerte- und Steuereinrichtung erfasst und verarbeitet ist. Sobald ein entsprechender Kurzschluss von der Auswerte- und Steuereinheit festgestellt ist, kann das elektrische Gerät oder die Werkzeugmaschine entsprechend angesteuert werden.
Solche Schnappscheiben haben sich in einer Vielzahl von unterschiedlichsten Anwendungen zwar bewährt, liefern jedoch ausschließlich ein elektrisches Schaltsignal, das keiner redundante Überprüfung unterzogen werden kann. Insbesondere wenn die Schnappscheibe aufgrund der Vielzahl von Schaltbewegungen ausleiert, ist oftmals eine zuverlässige Erzeugung des elektrischen Schaltsignals nicht mehr gegeben.
Es ist daher Aufgabe der Erfindung, eine Vorrichtung der eingangs genannten Gattung derart weiterzubilden, dass das jeweilige von der Schnappscheibe ausgelöste Schaltsignal zeitlich unmittelbar verifiziert ist, durch einen elektrischen Impuls als zweites redundantes Schaltsignal und das elektrische Gerät von der Auswerte- und Steuereinrichtung erst dann geschaltet ist, wenn das Schaltsignal der Schnappscheibe und der weitere zweite elektrische Impuls vorliegen.
Diese Aufgabe ist erfindungsgemäß durch die Merkmale des kennzeichnenden Teils von Patentanspruch 1 gelöst.
Weitere vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen .Upon actuation of the snap-action disc, the latter generates an electrical connection with the opposite switching contact, so that a short-circuit arises, which is detected and processed by an electrical evaluation and control device. As soon as a corresponding short circuit is detected by the evaluation and control unit, the electrical device or the machine tool can be controlled accordingly.
Although such snap discs have proven themselves in a variety of different applications, but provide only an electrical switching signal that can not be subjected to redundant review. In particular, when the snap disk due to the large number of switching movements, often no reliable generation of the electrical switching signal is given.
It is therefore an object of the invention to improve a device of the type mentioned in such a way that the respective triggered by the snap-action switching signal is directly verified in time, only then switched by an electrical pulse as the second redundant switching signal and the electrical device of the evaluation and control device is when the switching signal of the snap disc and the further second electrical pulse are present.
This object is achieved by the features of the characterizing part of claim 1.
Further advantageous developments of the invention will become apparent from the dependent claims.

Dadurch, dass an dem Betätigungselement mindestens ein Piezo-Element angebracht ist, dass das Durchschnappen der Schnappscheibe durch das Piezo-Element erfasst ist und dass das Piezo-Element einen elektrischen Impuls erzeugt, ist ein redundantes System umgesetzt. Dieses redundante Signal wird anschließend von der Auswerte- und Steuereinrichtung verarbeitet. Dadurch, dass das elektrische Schaltsignal der Schnappscheibe gleichzeitig gemessen und zur Erzeugung eines elektrischen Schaltsignales ausgewertet ist, ist erreicht, dass die Betätigung der Schnappscheibe, also das Erreichen des jeweiligen Gegenkontaktes mit dem Durchschnappvorgang, unverzüglich überprüft ist, denn die Piezo-Elemente messen die Betätigungskraft des Betätigungselementes und sobald die Schnappscheibe durchschnappt ist diese Betätigungskraft erheblich reduziert. In Bezug auf sicherheitskritische Anwendungen werden heutzutage redundante Systeme gefordert. Somit ist das System "Schnappscheibe-Gegenkontakt" mit einer zweiten Technologie zu verbinden, welche instantan mit dem Durchschnappen der Scheibe ein zweites elektrisches Signal erzeugt, das zeitlich eindeutig mit dem Zeitpunkt des Durchschnappens der Scheibe gekoppelt ist.
Folglich ist mit Hilfe eines oder mehrerer Piezo-Elemente eine einfache technische Maßnahme geschaffen, durch die zusammen mit dem Schaltsignal der jeweiligen Schnappscheibe ein redundantes System gebildet ist, ohne dass technisch aufwändige Bauteile oder komplizierte Steuerprogramme zu verwenden sind.
In der Zeichnung sind drei erfindungsgemäße Ausführungsbeispiele einer Schaltvorrichtung dargestellt, die nachfolgend näher erläutert sind.
Im Einzelnen zeigt:

Figur 1a
eine Vorrichtung zur Erzeugung eines elektrischen Schaltsignals, bestehend aus einem Gehäuse, in dem eine Aussparung eingearbeitet ist, aus einem Betätigungselement, durch das eine in dem Gehäuse abgestützte Schnappscheibe betätigbar ist, an dem ein Piezo-Element zum Erzeugen eines 2. Elektrischen Impulses angebracht sind und aus einem elektrischen auf einer Leiterplatte vorgesehenen Kontakt, im Ausgangszustand und in Seitenansicht,
Figur 1b
die Vorrichtung gemäß Figur 1a im Betätigungszustand, bei dem die Schnappscheibe durchgedrückt ist und die elektrischen Kontakte der Kontaktfläche verbindet,
Figur 2
die Vorrichtung gemäß Figur 1a mit Piezo-Elementen, die an einer anderen Position im Bereich des Gehäuses angebracht sind, welche nicht unter den Gegenstand des Anspruches 1 fällt,
Figur 3
die Vorrichtung gemäß Figur 2 mit quaderförmigen PiezoElementen und
Figur 4
ein schematisches Schaltbild für die redundante Überprüfung des elektrisch erzeugten Schaltsignals mit einem Kraft-WegeDiagramm bezogen auf die Betätigung der Schnappscheibe und des Piezo-Elementes gemäß den Figuren 1a bis 3.
Characterized in that on the actuating element at least one piezoelectric element is mounted, that the snap-through of the snap-action disc is detected by the piezoelectric element and that the piezoelectric element generates an electrical pulse, a redundant system is implemented. This redundant signal is then processed by the evaluation and control device. The fact that the electrical switching signal of the snap-action disc is simultaneously measured and evaluated to generate an electrical switching signal ensures that the actuation of the snap-action disc, ie the reaching of the respective mating contact with the snap-through process, is checked immediately, since the piezoelectric elements measure the actuating force of the actuating element and as soon as the snap-action disc snaps through, this operating force is considerably reduced. With regard to safety-critical applications, redundant systems are required today. Thus, the "snap-on mating contact" system is to be connected to a second technology, which instantaneously generates a second electrical signal as it snaps through the disk, which time is uniquely coupled with the time when the disk breaks through.
Consequently, with the help of one or more piezoelectric elements, a simple technical measure is created, by which, together with the switching signal of the respective snap-action disc, a redundant system is formed without the need for technically complex components or complicated control programs.
In the drawing, three embodiments of a switching device according to the invention are shown, which are explained in more detail below.
In detail shows:
FIG. 1a
a device for generating an electrical switching signal, consisting of a housing in which a recess is incorporated, from an actuating element, through which a snap-action disc supported in the housing is actuated, to which a piezoelectric element for generating a second electrical pulse are attached and from an electrical contact provided on a printed circuit board, in the initial state and in side view,
FIG. 1b
the device according to FIG. 1a in the operating state, in which the snap-action disc is pushed through and connects the electrical contacts of the contact surface,
FIG. 2
the device according to FIG. 1a with piezo elements mounted at a different position in the region of the housing which does not fall under the subject-matter of claim 1,
FIG. 3
the device according to FIG. 2 with rectangular PiezoElementen and
FIG. 4
a schematic diagram for the redundant check of the electrically generated switching signal with a force-displacement diagram based on the operation of the snap-action disc and the piezoelectric element according to the FIGS. 1a to 3 ,

In den Figuren 1a und 1b ist eine Vorrichtung 1 abgebildet, durch die eine manuelle oder mechanisch erzeugte Zustellbewegung in ein elektrisches Schaltsignal 12 erzeugt werden kann, durch das ein elektrisches Gerät, beispielsweise eine Werkzeugmaschine, ein Telefon, ein Küchengerät oder dergleichen, bedienbar ist.In the FIGS. 1a and 1b a device 1 is shown, through which a manual or mechanically generated feed movement can be generated in an electrical switching signal 12, through which an electrical device, such as a machine tool, a telephone, a kitchen appliance or the like, can be operated.

Die Vorrichtung 1 besteht aus einem Gehäuse 3, in dem mindestens eine Aussparung 4 eingearbeitet ist. In die Aussparung 4 ist ein Betätigungselement 5 axial beweglich gelagert, das aus einem von außen zugänglichen Betätigungsstößel 6 und einer Kugelmembrane 8 gebildet ist. Der Betätigungsstößel 6 ist dabei gemäß Figur 1b mit einer Zustellkraft 2 beaufschlagbar, so dass dieser in das Innere des Gehäuses 3 eingedrückt oder eingefahren ist. Der Betätigungsstößel 6 liegt auf der Kugelmembrane 8 auf, die fest mit dem Gehäuse 3 gekoppelt ist.The device 1 consists of a housing 3, in which at least one recess 4 is incorporated. In the recess 4, an actuating element 5 is mounted axially movable, which is formed from an externally accessible actuating plunger 6 and a spherical membrane 8. The actuating plunger 6 is according to FIG. 1b 2 acted upon with a delivery force, so that it is pressed or retracted into the interior of the housing 3. The actuating plunger 6 rests on the spherical membrane 8, which is fixedly coupled to the housing 3.

Darüberhinaus liegt die Kugelmembrane 8 auf der Oberseite einer Schnappscheibe 9 auf, die kuppelförmig oder domförmig in Richtung des Betätigungselementes 5 im unbetätigten Zustand gemäß Figur 1a ausgewölbt ist. Die Schnappscheibe 9 besteht aus einem elektrisch leitfähigen metallischen Werkstoff. Zudem weist die Schnappscheibe 9 eine Vorspannung, ähnlich einer Schraubendruckfeder im gespannten Zustand, auf, die der Zustellkraft 2 entgegenwirkt.Moreover, the ball membrane 8 rests on the top side of a snap-action disc 9, which is dome-shaped or dome-shaped in the direction of the actuating element 5 in the unactuated state according to FIG FIG. 1a is bulged. The snap disc 9 is made of an electrically conductive metallic material. In addition, the snap disc 9 has a bias, similar to a helical compression spring in the tensioned state, which counteracts the feed force 2.

In dem Inneren des Gehäuses 3 ist eine Leiterplatte 10 vorgesehen, auf der eine elektrische Kontaktfläche 11 vorgesehen ist. Die Schaltfläche 11 ist dabei unterhalb der jeweiligen Schnappscheibe 9 angeordnet. Sobald die Schnappscheibe 9 von der Zustellkraft 2 in Richtung der Schaltfläche 11 gedrückt ist und die Schnappscheibe 9 durchschnappt, ist sie mit dem Schaltkontakt auf der Leiterplatte 11 in Form eines Kurzschlusses verbunden, so dass ein elektrisches Schaltsignal 12 generiert ist. Beim Durchschnappen der Schnappscheibe 9 ist gemäß Figur 4 die Widerstandskraft, die von der Schnappscheibe 9 entgegen der Zustellkraft 2 wirkt, erheblich verringert, da diese nahezu gegen Null fällt. Durch den Abfall der Zustellkraft 2 aufgrund des Durchschnappvorgangs der Schnappscheibe 9 entsteht ein von einem Piezoelement 21 erzeugtes Impulssignals 22. Sowohl das Schaltsignal 12 als auch das Impulssignal 22 werden von einer Auswerte- und Steuereinrichtung 13 erfasst. Dabei dient das Schaltsignal 12 zur Steuerung eines elektrischen Gerätes und das Signal 22 als redundanter elektrischer Impuls und zwar dahingehend, dass das Impulssignal 22 instantan auf den Zeitpunkt des Durchschnappens der Schnappscheibe 9 folgend zu dem Schaltsignal 12 entsteht. Bereits bei einer zeitlich geringfügigen Abweichung zwischen der Erzeugung des Schaltsignals 12 und der Entstehung des Impulssignals 22 wird das Schaltsignal 12 von der Auswerte- und Steuereinrichtung 13 nicht an das elektrische Gerät weitergegeben bzw. weitergeleitet. Das Impulssignal 22 dient demnach zur redundanten Verifizierung der Erzeugung des Schaltsignals 12.In the interior of the housing 3, a circuit board 10 is provided, on which an electrical contact surface 11 is provided. The button 11 is arranged below the respective snap disc 9. As soon as the snap disc 9 is pressed by the feed force 2 in the direction of the button 11 and snaps the snap disc 9, it is connected to the switching contact on the circuit board 11 in the form of a short circuit, so that an electrical switching signal 12 is generated. When snapping the snap disk 9 is according to FIG. 4 the resistance force, which acts from the snap disk 9 against the feed force 2, considerably reduced, since this falls almost to zero. Due to the drop in the feed force 2 due to the snap action of the snap disk 9, a pulse signal 22 generated by a piezoelectric element 21 is produced. Both the switching signal 12 and the pulse signal 22 are detected by an evaluation and control device 13. In this case, the switching signal 12 is used to control an electrical device and the signal 22 as a redundant electrical pulse in such a way that the pulse signal 22 instantaneously to the time of snapping the snap disk 9 following the switching signal 12 is formed. Even with a slight time difference between the generation of the switching signal 12 and the formation of the pulse signal 22, the switching signal 12 is not passed from the evaluation and control device 13 to the electrical device or forwarded. The pulse signal 22 thus serves for the redundant verification of the generation of the switching signal 12.

Gemäß den Figuren 1a und 1b ist das jeweilige Piezo-Element 21 auf dem Betätigungsstößel 6 angebracht. Gemäß den Figuren 2 und 3 ist das Piezo-Element 21 im Bereich des Gehäuses vorgesehen und ringförmig bzw. quaderförmig ausgestaltet.According to the FIGS. 1a and 1b is the respective piezo-element 21 mounted on the actuating plunger 6. According to the FIGS. 2 and 3 is the piezoelectric element 21 provided in the region of the housing and designed annular or parallelepiped.

Claims (7)

  1. A device (1) for converting mechanical movements into an electrical switching signal (12) for an electrically operated machine tool or another electrically operated device, consisting of,
    - a housing (3) in which at least one recess (4) is worked.
    - an actuating element (5) mounted with axial guidance in the recess (4) of the housing (3),
    - a snap disc (9) held under preload in the housing (3) that has a curvature in the direction of the actuating element (5) in the unoperated condition and
    - a circuit board (10) arranged in the housing (3) on which at least one electrical switching contact (11) is provided facing in the direction of the snap disc (9) and arranged flush with it,
    characterised in that
    at least one piezoelectric element (21) is attached to the actuating element (5), that wen the snap disc (9) snaps through this is registered by the piezoelectric element (21) and that the piezoelectric element (21) generates an electrical pulse (22) that is output to an evaluation and control unit (13) by means of which the electrical switching signal (12) of the snap disc (9) is measured at the same time and is evaluated for the purpose of generating an electrical switching signal (12).
  2. The device (1) in accordance with Claim 1,
    characterised in that
    the piezoelectric element (21) is configured in such a way that the reduction in the advance force (2) is registered when the snap disc (9) snaps through.
  3. The device (1) in accordance with Claim 1 or 2,
    characterised in that
    the distance of the snap travel of the snap disc (9) from its starting position to the switching position is such that the snap disc (9) snaps through when it reaches the switching position.
  4. The device (1) in accordance with Claims 1 to 3,
    characterised in that
    the piezoelectric element (21) is shaped as a ring or a cube.
  5. The device (1) in accordance with one of the aforementioned claims,
    characterised in that
    the piezoelectric element (21) is arranged on the actuating element (5).
  6. The device (1) in accordance with one of the aforementioned claims,
    characterised in that
    the actuating element (5) comprises an actuating tappet (6) and a spherical membrane (8) each of which are held within the housing (3) so as to be axially movable.
  7. The device (1) in accordance with one of the aforementioned claims,
    characterised in that
    the actuating tappet (6) makes direct contact with the surface of the spherical membrane (8) in the non-operated status.
EP16168708.2A 2016-05-09 2016-05-09 Device for converting mechanical movements into an electrical switching signal Active EP3244430B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16168708.2A EP3244430B1 (en) 2016-05-09 2016-05-09 Device for converting mechanical movements into an electrical switching signal

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Application Number Priority Date Filing Date Title
EP16168708.2A EP3244430B1 (en) 2016-05-09 2016-05-09 Device for converting mechanical movements into an electrical switching signal

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EP3244430A1 EP3244430A1 (en) 2017-11-15
EP3244430B1 true EP3244430B1 (en) 2018-08-29

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2052763A1 (en) * 1970-10-28 1972-05-04 Schmersal & Co K A Electrical switching device for converting the position of a mechanical transmitter into an electrical signal, in particular limit switches
DE102005037613A1 (en) * 2005-08-05 2007-02-08 Rafi Gmbh & Co. Kg microswitch
EP2645391B1 (en) * 2012-03-27 2016-10-12 RAFI GmbH & Co. KG Switch device and switch contact
DE202013012231U1 (en) * 2013-11-14 2015-09-23 Euchner Gmbh + Co. Kg Device for releasably locking and signaling a predefinable state of a protective device of a machine or the like, in particular safety switch

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