EP2184755B1 - Device for monitoring the status of a protection device of a machine - Google Patents

Device for monitoring the status of a protection device of a machine Download PDF

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Publication number
EP2184755B1
EP2184755B1 EP20090012124 EP09012124A EP2184755B1 EP 2184755 B1 EP2184755 B1 EP 2184755B1 EP 20090012124 EP20090012124 EP 20090012124 EP 09012124 A EP09012124 A EP 09012124A EP 2184755 B1 EP2184755 B1 EP 2184755B1
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EP
European Patent Office
Prior art keywords
switch
actuation element
switch actuation
contact
actuator
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.)
Not-in-force
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EP20090012124
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German (de)
French (fr)
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EP2184755A1 (en
Inventor
Erik BÄCHLE
Tobias KÖNIG
Ilo Grimm
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Euchner GmbH and Co KG
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Euchner GmbH and Co KG
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Publication of EP2184755A1 publication Critical patent/EP2184755A1/en
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    • 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 monitoring the state of a protective device of a machine, in particular a safety switch for monitoring the closed state of a protective door or the like.
  • a safety switch is known in the head of a switch, for example, on a protective door of a protective device defined actuator is inserted while a ratchet wheel rotates.
  • a switch plunger is held in contact with the peripheral surface of the switching wheel.
  • the switching plunger engages in a recess provided for this purpose on the peripheral surface of the switching wheel and thereby closes a contact pair. In this way, the inserted state of the actuator and thus the closed position of the protective door can be electrically signaled.
  • the safety switch also provides a locking function, ie that the actuator is lockable in the switch head, in particular with regard to the leading out of the switch head can be locked, and thereby the protective device can be locked in the closed state.
  • this is the switching plunger spring-loaded or magnetic force loaded in the detent recess, and thus blocks a rotational movement of the cam. If, in the locked closed state, the protective device on the guard door is forcibly pulled with high force, the safety switch can be damaged and, as a result, a malfunction can no longer be guaranteed by the protective function of the safety switch.
  • the invention has for its object to provide a generic device, which overcomes the disadvantages of the prior art.
  • a device is to be provided which ensures the safety function even when exposed to impermissibly high actuation forces.
  • the manufacture, installation and maintenance of the device should be simplified and thereby save time and money.
  • the object is achieved by a device for monitoring the state of a protective device of a machine, in particular by a safety switch for monitoring the closed state of a protective door or the like, the device having an activatable on the protective device actuator and a switch housing with a movably mounted therein Has switch actuator and the switch actuator is held by a contact force in abutment with a movable by the actuator when closing and opening the protective device cam track.
  • the closed state of the protective device can be signaled by the device by predefined relative positions of the switch actuating element with respect to the curved path.
  • the switch operating element can be converted into a fail-safe position in which the device signals the non-closed state of the protective device in an irregular operating state occurring, for example, as a result of an excessive force acting on the curved path and / or the switch actuating element by the contact force acting on the switch actuating element.
  • the irregular operating state can be given, for example, in that the abutment formed in the regular operating state by the cam track for the switch actuator is canceled, for example because the switch head has been torn off, and / or that the switch actuator is broken off.
  • the excessive force on the operator may be exerted by the operator forcibly pulling on the protective door to which the actuator is attached.
  • this can lead to the switch operating element being transferred to a position in which the unlocked and also no longer closed state of the protective device is properly signaled, but the safety switch is damaged, for example an end section of the switch actuating element is broken off ; at a subsequent closing the safety device then runs the risk that the damaged safety switch no longer offers a 100% functional guarantee, but that, as before, the closed and optionally also the locked state can be signaled.
  • a control device downstream of the safety switch it is not possible to detect the machine arranged inside the protective device that the safety switch is damaged by the violent actuation.
  • the switch operating element is placed in a fail-safe position at an inadmissibly excessive force from which the switch actuator is no longer striglite alone due to a displacement of the actuator.
  • the device signals the non-latched and possibly also the non-closed state of the protection device, regardless of the position of the actuator, thereby preventing operation of the machine located inside the protection device. Consequently, the device according to the invention ensures a safe (safe) operating state of the machine.
  • the switch actuator is locked in the fail-safe position and maintains this locked position regardless of the position of the actuator.
  • a blocking element such as a switch plunger of a switch element, are brought into preferably positive engagement with the switch actuator and thereby block a shift of the switch actuator in any case such that no longer the locked state of the protective device can be signaled by the switch actuator.
  • the switch actuator exits further from the switch housing than may be the case in the regular operating condition.
  • Such an irregular operating state can occur, for example, when the switch head of the device has been damaged by force or even separated from the switch base housing.
  • the device of the downstream control device signals a non-closed state of the protective device, so that the control device prevents commissioning of the machine arranged in the protective device or interrupts the ongoing operation of the machine.
  • the exit of the switch actuating element from the switch housing may in particular be caused by the force acting on the switch actuating element contact force, which is provided in the regular operating condition to hold the switch operating element in contact with the curved path.
  • the device comprises an electrical switch element having a positive opener contact, and in the fail-safe position of the switch operating element, the positive opener contact is opened.
  • a control current for the machine arranged within the protective device can be guided via the positive-opener contact, so that it is ensured that the operation of the machine is interrupted when the forced-opener contact is open.
  • Positive-opener contacts are basically made up of the same elements as switches with normally-open contacts. However, the switch contacts are opened in a positive opener contact by the external force and even if a arranged in the switch element spring breaks or when the contacts are welded.
  • the positive opening can by a positive, rigid connection between the switch plunger and the contact bridge be achieved.
  • Zwangsöffnercrede Preferably Zwangsöffnerminde have no elastic parts.
  • the switch actuating element has a further curved track, on which a switching plunger of the positive opener contact is held in abutment.
  • This further curved path may have several sections, in particular a first section for the regular operating state, and a second section for the irregular operating state.
  • the further curved track can have a latching edge, into which the switching plunger of the positive opener contact can engage in the fail-safe position of the switch actuating element.
  • the device has a in the switch housing, in particular in a fixable on a switch housing switch head housing, rotatably mounted cam, which in turn forms a curved path on which the switch actuator is held in abutment.
  • the curved path has a contour deviating from the circular shape, so that the switch actuating element held in contact with the cam in the radial direction assumes different positions depending on the angle of rotation of the cam and accordingly different contacts can be switched.
  • the actuator in turn turns the cam.
  • the installation of the switch actuating element on the cam can be provided by a spring force and / or by a magnetic force. If the curved path of the cam has locking recesses, can by the switch operating element and a tumbler are provided by the contact force ensures that the switch actuating element engages in the latching recess and thereby blocks the rotation of the cam.
  • the locking device comprises an electromagnet which is arranged coaxially with the switch actuating element.
  • the switch actuating element Preferably, a coil of the electromagnet at least partially covers the switch actuating element, which in turn may be formed as an armature of the electromagnet.
  • the Fig. 1 shows a schematic plan view of an overall arrangement with a device 1 according to the invention for monitoring the state of a protective device 2 of a machine 3, in particular the closed state of a protective door, with a Room separation device is closed, for example, to protect the operating personnel from hazards caused by the machine 3 in operation.
  • the device 2 has a first part 4, for example a frame for the protective device 2.
  • the first part 4 has an opening 5 which can be closed by a second part 6, for example by a protective door corresponding to the double arrow 10 with respect to the first Part 4 is movable and is movably supported by bearing elements 11.
  • the device 1 has a safety switch which comprises a preferably arranged on the fixed first part 4 of the protection device 2 switch element 7 and a preferably arranged on the movable second part 6 actuator 8.
  • the Fig. 2 to 5 show a device 1 according to the invention for monitoring the state of the protective device 2 of the machine 4 in four different states.
  • the device 1 has a cam disk 12 which is rotatable about the axis of rotation 20 in the regular operating state and which is rotatable in the direction of the double arrow 19 by the actuator 8 (not shown).
  • a switch operating element 14 is held in abutment with the cam track 15 formed on the outer peripheral surface of the cam 12 due to the action of an energy accumulator 16, for example a compression spring. Due to the curved path 15, which deviates at least in sections from a circular path about the axis of rotation 20, there is a displacement of the switch actuating element 14 displaceably mounted in the device 1 along its longitudinal axis.
  • the switch actuating element 14 On its outer surface, the switch actuating element 14 at least in sections on a contour which forms a further cam track 17, on which the switching plunger 21 of a positive contactor 18 is held by means of a further force accumulator
  • the in the Fig. 2 to 5 shown components of the device 1 are housed in a switch housing, not shown, wherein preferably the cam 12 is arranged in a switch head housing, which is detachably connectable to a switch base housing, in which inter alia, the switch actuator 14 and the Zwangsöffnertitle 18 are arranged.
  • the dividing line 25 symbolically shows the separation between the switch head housing (top) and the switch base housing (bottom).
  • the protection device 2 is not closed and therefore the actuator 8 is not inserted into the device 1. Accordingly, the positive opener contact 18 is not closed and the device 1 signals to the higher-level control device the open state of the protective device 2.
  • the Fig. 3 shows the device 1 in a state in which the protective device 2 is closed and, accordingly, the actuator 8 has rotated the cam 12 by approximately 90 ° counterclockwise.
  • the latching groove 13 in the cam 12 comes to lie opposite the axial end of the switch actuating element 14, whereupon the switch actuating element 14 engages in the latching groove 13 due to the contact force of the energy accumulator 16.
  • the switch plunger 21 travels along the further curved path 17 and, due to the action of the further energy accumulator 23, enters the depression of the further curved path 17.
  • the positive opener contact 18 is closed and the device 1 thereby signals the closed state of the protective device 2.
  • the illustrated embodiment also includes a locking means, because by the engagement of the switch actuating element 14 in the locking groove 13, the cam 12 is blocked against rotation and thereby the actuator 8 can not be led out of the switch head, and therefore the protective device can not be opened.
  • the tumbler can preferably be done by positive locking, in particular by the locking groove 13 has a self-locking latching edge.
  • the tumbler can be canceled by the action of the electromagnet 40, which acts on the magnetizable in a section 38 switch actuator 14 during energization and the switch actuator 14 against the action of the energy accumulator 16 moves in the direction opposite to the arrow 27 and thereby disengages the switch actuator with the Locking groove 13 is coming.
  • the Fig. 4 shows the device 1 in a state in which due to an excessive force, for example by a forced pulling on the actuator 8 in the closed state of the protective device 2, the switch actuator 14 has been damaged such that a cam plate 12 facing the end of the switch actuator 14 along the in the Fig. 3 broken line indicated broken line 36 is canceled. Due to the force acting on the opposite axial end of the switch actuating element 14 contact force of the energy accumulator 16, the plunger is still held in the recess 13, thus, from the outside of the device 1 is not to be considered that the switch actuator 14 is damaged.
  • an opened state of the protective device 2 is signaled by the device 1 due to the open positive-opener contact 18, and consequently the higher-level control device is signaled that that the machine 3 arranged inside the protective device 2 may not be put into operation or that an operation of the machine 3 has to be interrupted.
  • This is achieved by virtue of the fact that the further cam track 17 has a renewed lift after the section-wise depression, so that the switch plunger 21 is forcibly moved and thereby the positive-opening contact 18 is opened in a form-fitting manner.
  • the Fig. 5 shows a state of the device 1, in which an irregular operating state has occurred in that the cam plate 12 was possibly separated completely with the switch head housing of the switch base housing and thus the abutment for the contact force of the switch actuating plunger 14 is omitted. Accordingly, the switch operating member 14 further out of the switch base housing, as may be the case in the regular operating condition. Even in this state, the device 1 signals a non-closed state of the protective device 2 due to the contour of the further curved path 17.
  • FIG. 5 another embodiment of the further cam track 17 is shown, which has a further recess 29 in a second section, which is less deep than the first recess and thereby the switch plunger 21 when entering the further recess 29 keeps the ZwangsöffnerAuth 18 in the open state ,
  • the further recess 29 differs in that it is delimited by at least one latching edge, which prevents the switch plunger 21 from being able to exit the further recess 29 solely by displacing the switch actuating element 14. In particular, this prevents that the positive-action contact 18 is closed by a force from above on the switch actuating element 14 can be and thus a closed state of the protection device 2 could be signaled.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Mechanisms For Operating Contacts (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Überwachen des Zustandes einer Schutzeinrichtung einer Maschine, insbesondere einen Sicherheitsschalter zum Überwachen des geschlossenen Zustandes einer Schutztür oder dergleichen.The invention relates to a device for monitoring the state of a protective device of a machine, in particular a safety switch for monitoring the closed state of a protective door or the like.

Aus der DE 43 28 297 C1 ist ein Sicherheitsschalter bekannt, in dessen Schalterkopf ein beispielsweise an einer Schutztür einer Schutzeinrichtung festgelegter Betätiger einführbar ist und dabei ein Schaltrad dreht. Innerhalb des Schaltergehäuses ist ein Schaltstößel in Anlage an der Umfangsfläche des Schaltrades gehalten. Bei einem Drehwinkel, welcher der geschlossenen Position der Schutztür entspricht, rastet der Schaltstößel in eine hierfür auf der Umfangsfläche des Schaltrades vorgesehene Rastvertiefung ein und schließt dadurch ein Kontaktpaar. Auf diese Weise ist der eingeführte Zustand des Betätigers und mithin die geschlossene Position der Schutztür elektrisch signalisierbar.From the DE 43 28 297 C1 a safety switch is known in the head of a switch, for example, on a protective door of a protective device defined actuator is inserted while a ratchet wheel rotates. Within the switch housing, a switch plunger is held in contact with the peripheral surface of the switching wheel. At an angle of rotation which corresponds to the closed position of the protective door, the switching plunger engages in a recess provided for this purpose on the peripheral surface of the switching wheel and thereby closes a contact pair. In this way, the inserted state of the actuator and thus the closed position of the protective door can be electrically signaled.

Für viele Anwendungen, beispielsweise bei Schutzhauben an Werkzeugmaschinen oder dergleichen, ist es erforderlich, dass der Sicherheitsschalter außerdem eine Zuhaltefunktion bereitstellt, d. h. dass der Betätiger in dem Schalterkopf arretierbar ist, insbesondere hinsichtlich des Herausführens aus dem Schalterkopf arretierbar ist, und dadurch die Schutzeinrichtung in dem geschlossenen Zustand arretierbar ist. Bei dem bekannten Sicherheitsschalter wird hierzu der Schaltstößel federkraftbelastet oder magnetkraftbelastet in der Rastvertiefung gehalten, und somit eine Drehbewegung der Kurvenscheibe blockiert. Wird im arretierten geschlossenen Zustand der Schutzeinrichtung an der Schutztür gewaltsam mit hoher Kraft gezogen, kann es zu einer Beschädigung des Sicherheitsschalters und demzufolge zu einer Fehlfunktion kommen, durch welche die Schutzfunktion des Sicherheitsschalters nicht mehr gewährleistet ist.For many applications, such as protective hoods on machine tools or the like, it is necessary that the safety switch also provides a locking function, ie that the actuator is lockable in the switch head, in particular with regard to the leading out of the switch head can be locked, and thereby the protective device can be locked in the closed state. In the known safety switch this is the switching plunger spring-loaded or magnetic force loaded in the detent recess, and thus blocks a rotational movement of the cam. If, in the locked closed state, the protective device on the guard door is forcibly pulled with high force, the safety switch can be damaged and, as a result, a malfunction can no longer be guaranteed by the protective function of the safety switch.

Aus der EP 1 274 107 A2 ist eine Vorrichtung zum Überwachen des Zustandes einer Schutzeinrichtung einer Maschine mit den Merkmalen des Oberbegriffs des Anspruchs 1 bekannt.From the EP 1 274 107 A2 a device for monitoring the state of a protective device of a machine having the features of the preamble of claim 1 is known.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung bereitzustellen, welche die Nachteile des Standes der Technik überwindet. Insbesondere soll eine Vorrichtung bereitgestellt werden, die auch bei Einwirkung unzulässig hoher Betätigungskräfte die Sicherheitsfunktion gewährleistet. Die Herstellung, Montage und Wartung der Vorrichtung soll vereinfacht und dadurch zeit- und kostensparend sein.The invention has for its object to provide a generic device, which overcomes the disadvantages of the prior art. In particular, a device is to be provided which ensures the safety function even when exposed to impermissibly high actuation forces. The manufacture, installation and maintenance of the device should be simplified and thereby save time and money.

Diese Aufgabe ist durch die im Anspruch 1 bestimmte Vorrichtung gelöst. Besondere Ausführungsarten der Erfindung sind in den Unteransprüchen bestimmt.This object is achieved by the device defined in claim 1. Particular embodiments of the invention are defined in the subclaims.

In einer Ausführungsart ist die Aufgabe gelöst durch eine Vorrichtung zum Überwachen des Zustandes einer Schutzeinrichtung einer Maschine, insbesondere durch einen Sicherheitsschalter zum Überwachen des geschlossenen Zustandes einer Schutztür oder dergleichen, wobei die Vorrichtung einen an der Schutzeinrichtung festlegbaren Betätiger und ein Schaltergehäuse mit einem darin beweglich gelagerten Schalterbetätigungselement aufweist und das Schalterbetätigungselement durch eine Anlagekraft in Anlage an einer von dem Betätiger beim Schließen und Öffnen der Schutzeinrichtung bewegbaren Kurvenbahn gehalten ist. In einem regulären Betriebszustand der Vorrichtung ist durch vordefinierte Relativpositionen des Schalterbetätigungselements in Bezug auf die Kurvenbahn der geschlossene Zustand der Schutzeinrichtung von der Vorrichtung signalisierbar. Das Schalterbetätigungselement ist in einem beispielsweise infolge einer überhöhten Krafteinwirkung auf die Kurvenbahn und/oder das Schalterbetätigungselement eintretenden irregulären Betriebszustand durch die auf das Schalterbetätigungselement wirkende Anlagekraft in eine Fail-Safe-Position überführbar, in der die Vorrichtung den nicht-geschlossenen Zustand der Schutzeinrichtung signalisiert.In one embodiment, the object is achieved by a device for monitoring the state of a protective device of a machine, in particular by a safety switch for monitoring the closed state of a protective door or the like, the device having an activatable on the protective device actuator and a switch housing with a movably mounted therein Has switch actuator and the switch actuator is held by a contact force in abutment with a movable by the actuator when closing and opening the protective device cam track. In a regular operating state of the device, the closed state of the protective device can be signaled by the device by predefined relative positions of the switch actuating element with respect to the curved path. The switch operating element can be converted into a fail-safe position in which the device signals the non-closed state of the protective device in an irregular operating state occurring, for example, as a result of an excessive force acting on the curved path and / or the switch actuating element by the contact force acting on the switch actuating element.

Der irreguläre Betriebszustand kann beispielsweise dadurch gegeben sein, dass das im regulären Betriebszustand durch die Kurvenbahn für das Schalterbetätigungselement gebildete Widerlager aufgehoben ist, etwa weil der Schalterkopf abgerissen wurde, und/oder dass das Schalterbetätigungselement abgebrochen ist.The irregular operating state can be given, for example, in that the abutment formed in the regular operating state by the cam track for the switch actuator is canceled, for example because the switch head has been torn off, and / or that the switch actuator is broken off.

Die überhöhte Kraft auf den Betätiger kann beispielsweise von der Bedienperson dadurch ausgeübt'werden, dass gewaltsam an der Schutztür gezogen wird, an welcher der Betätiger angebracht ist. Bei den bekannten Sicherheitsschaltern kann dies dazu führen, dass das Schalterbetätigungselement in eine Position überführt wird, in der zwar ordnungsgemäß der nicht mehr zugehaltene und auch nicht mehr geschlossene Zustand der Schutzeinrichtung signalisiert wird, wobei aber der Sicherheitsschalter beschädigt wird, beispielsweise ein Endabschnitt des Schalterbetätigungselements abbricht; bei einem anschließenden Schließen der Schutzeinrichtung besteht dann die Gefahr, dass der beschädigte Sicherheitsschalter keine hundertprozentige Funktionsgarantie mehr bietet, dass aber nach wie vor der geschlossene und gegebenenfalls auch der zugehaltene Zustand signalisiert werden kann. Dies führt im Ergebnis dazu, dass für eine dem Sicherheitsschalter nachgeordnete Steuereinrichtung der innerhalb der Schutzeinrichtung angeordneten Maschine nicht erkennbar ist, dass der Sicherheitsschalter durch das gewaltsame Betätigen beschädigt ist.For example, the excessive force on the operator may be exerted by the operator forcibly pulling on the protective door to which the actuator is attached. In the known safety switches, this can lead to the switch operating element being transferred to a position in which the unlocked and also no longer closed state of the protective device is properly signaled, but the safety switch is damaged, for example an end section of the switch actuating element is broken off ; at a subsequent closing the safety device then runs the risk that the damaged safety switch no longer offers a 100% functional guarantee, but that, as before, the closed and optionally also the locked state can be signaled. As a result, for a control device downstream of the safety switch, it is not possible to detect the machine arranged inside the protective device that the safety switch is damaged by the violent actuation.

Durch die erfindungsgemäße Vorrichtung wird bei einer unzulässigüberhöhten Krafteinwirkung das Schalterbetätigungselement in eine Fail-Safe-Position gebracht, aus der heraus das Schalterbetätigungselement allein aufgrund eines Verschiebens des Betätigers nicht mehr herausführbar ist. Insbesondere signalisiert die Vorrichtung in dieser Fail-Safe-Position den nicht-zugehaltenen und gegebenenfalls auch den nicht-geschlossenen Zustand der Schutzeinrichtung unabhängig von der Position des Betätigers und verhindert dadurch einen Betrieb der innerhalb der Schutzeinrichtung angeordneten Maschine. Mithin gewährleistet die erfindungsgemäße Vorrichtung einen sicheren (safe) Betriebszustand der Maschine.By the device according to the invention, the switch operating element is placed in a fail-safe position at an inadmissibly excessive force from which the switch actuator is no longer herausführbar alone due to a displacement of the actuator. In particular, in this fail-safe position, the device signals the non-latched and possibly also the non-closed state of the protection device, regardless of the position of the actuator, thereby preventing operation of the machine located inside the protection device. Consequently, the device according to the invention ensures a safe (safe) operating state of the machine.

In einer Ausführungsart ist das Schalterbetätigungselement in der Fail-Safe-Position blockiert und behält diese blockierte Position unabhängig von der Stellung des Betätigers bei. Hierzu kann ein Blockierelement, beispielsweise ein Schaltstößel eines Schalterelements, in vorzugsweise formschlüssigen Eingriff mit dem Schalterbetätigungselement gebracht werden und dadurch ein Verschieben des Schalterbetätigungselements jedenfalls derart blockieren, dass durch das Schalterbetätigungselement nicht mehr der zugehaltene Zustand der Schutzeinrichtung signalisierbar ist.In one embodiment, the switch actuator is locked in the fail-safe position and maintains this locked position regardless of the position of the actuator. For this purpose, a blocking element, such as a switch plunger of a switch element, are brought into preferably positive engagement with the switch actuator and thereby block a shift of the switch actuator in any case such that no longer the locked state of the protective device can be signaled by the switch actuator.

In einer Ausführungsart tritt das Schalterbetätigungselement in der Fail-Safe-Position weiter aus dem Schaltgehäuse aus, als dies im regulären Betriebszustand der Fall sein kann. Ein derartiger irregulärer Betriebszustand kann beispielsweise dann auftreten, wenn durch Gewalteinwirkung der Schalterkopf der Vorrichtung beschädigt oder sogar von dem Schaltergrundgehäuse abgetrennt wurde. Auch in dieser Position signalisiert die Vorrichtung der nachgeordneten Steuereinrichtung einen nicht-geschlossenen Zustand der Schutzeinrichtung, so dass die Steuereinrichtung ein Inbetriebnehmen der in der Schutzeinrichtung angeordneten Maschine verhindert oder den laufenden Betrieb der Maschine unterbricht. Der Austritt des Schalterbetätigungselements aus dem Schaltergehäuse kann insbesondere durch die auf das Schalterbetätigungselement wirkende Anlagekraft hervorgerufen sein, die im regulären Betriebszustand dazu vorgesehen ist, das Schalterbetätigungselement in Anlage an der Kurvenbahn zu halten.In one embodiment, in the fail-safe position, the switch actuator exits further from the switch housing than may be the case in the regular operating condition. Such an irregular operating state can occur, for example, when the switch head of the device has been damaged by force or even separated from the switch base housing. Also in this position, the device of the downstream control device signals a non-closed state of the protective device, so that the control device prevents commissioning of the machine arranged in the protective device or interrupts the ongoing operation of the machine. The exit of the switch actuating element from the switch housing may in particular be caused by the force acting on the switch actuating element contact force, which is provided in the regular operating condition to hold the switch operating element in contact with the curved path.

In einer Ausführungsart weist die Vorrichtung ein elektrisches Schalterelement mit einem Zwangsöffnerkontakt auf, und in der Fail-Safe-Position des Schalterbetätigungselements ist der Zwangsöffnerkontakt geöffnet. Über den Zwangsöffnerkontakt kann ein Steuerstrom für die innerhalb der Schutzeinrichtung angeordnete Maschine geführt sein, so dass gewährleistet ist, dass bei geöffnetem Zwangsöffnerkontakt der Betrieb der Maschine unterbrochen ist. Zwangsöffnerkontakte sind prinzipiell aus den gleichen Elementen aufgebaut wie Schalter mit Schließerkontakten. Allerdings werden die Schaltkontakte bei einem Zwangsöffnerkontakt durch die äußere Kraft geöffnet und zwar auch dann, wenn eine in dem Schalterelement angeordnete Feder bricht oder wenn die Kontakte verschweißt sind. Die Zwangsöffnung kann durch eine formschlüssige, starre Verbindung zwischen dem Schaltstößel und der Kontaktbrücke erreicht werden. Vorzugsweise weisen Zwangsöffnerkontakte keine elastischen Teile auf.In one embodiment, the device comprises an electrical switch element having a positive opener contact, and in the fail-safe position of the switch operating element, the positive opener contact is opened. A control current for the machine arranged within the protective device can be guided via the positive-opener contact, so that it is ensured that the operation of the machine is interrupted when the forced-opener contact is open. Positive-opener contacts are basically made up of the same elements as switches with normally-open contacts. However, the switch contacts are opened in a positive opener contact by the external force and even if a arranged in the switch element spring breaks or when the contacts are welded. The positive opening can by a positive, rigid connection between the switch plunger and the contact bridge be achieved. Preferably Zwangsöffnerkontakte have no elastic parts.

In einer Ausführungsart weist das Schalterbetätigungselement eine weitere Kurvenbahn auf, an welcher ein Schaltstößel des Zwangsöffnerkontakts in Anlage gehalten ist. Diese weitere Kurvenbahn kann mehrere Abschnitte aufweisen, insbesondere einen ersten Abschnitt für den regulären Betriebszustand, und einen zweiten Abschnitt für den irregulären Betriebszustand. In dem zweiten Abschnitt kann die weitere Kurvenbahn eine Rastflanke aufweisen, in welche der Schaltstößel des Zwangsöffnerkontakts in der Fail-Safe-Position des Schalterbetätigungselements einrasten kann. Dadurch ist eine Verschiebung des Schalterbetätigungselements verhindert, insbesondere eine Verschiebung derart, dass die Vorrichtung den geschlossenen und zugehaltenen Zustand der Schutzeinrichtung signalisiert.In one embodiment, the switch actuating element has a further curved track, on which a switching plunger of the positive opener contact is held in abutment. This further curved path may have several sections, in particular a first section for the regular operating state, and a second section for the irregular operating state. In the second section, the further curved track can have a latching edge, into which the switching plunger of the positive opener contact can engage in the fail-safe position of the switch actuating element. As a result, a displacement of the switch actuating element is prevented, in particular a shift such that the device signals the closed and locked state of the protective device.

In einer Ausführungsart weist die Vorrichtung eine in dem Schaltergehäuse, insbesondere in einem an einem Schaltergrundgehäuse festlegbaren Schalterkopfgehäuse, drehbar gelagerte Kurvenscheibe auf, die ihrerseits eine Kurvenbahn bildet, an welcher das Schalterbetätigungselement in Anlage gehalten ist. Die Kurvenbahn weist eine von der Kreisform abweichende Kontur auf, so dass das in Radialrichtung an der Kurvenscheibe in Anlage gehaltene Schalterbetätigungselement unterschiedliche Positionen abhängig vom Drehwinkel der Kurvenscheibe einnimmt und dementsprechend unterschiedliche Kontakte geschaltet werden können. Der Betätiger dreht seinerseits die Kurvenscheibe. Die Anlage des Schalterbetätigungselements an der Kurvenscheibe kann durch eine Federkraft und/oder durch eine Magnetkraft bereitgestellt werden. Sofern die Kurvenbahn der Kurvenscheibe Rastvertiefungen aufweist, kann durch das Schalterbetätigungselement auch eine Zuhaltung bereitgestellt werden, indem die Anlagekraft dafür sorgt, dass das Schalterbetätigungselement in die Rastausnehmung einrastet und dadurch die Drehung der Kurvenscheibe blockiert.In one embodiment, the device has a in the switch housing, in particular in a fixable on a switch housing switch head housing, rotatably mounted cam, which in turn forms a curved path on which the switch actuator is held in abutment. The curved path has a contour deviating from the circular shape, so that the switch actuating element held in contact with the cam in the radial direction assumes different positions depending on the angle of rotation of the cam and accordingly different contacts can be switched. The actuator in turn turns the cam. The installation of the switch actuating element on the cam can be provided by a spring force and / or by a magnetic force. If the curved path of the cam has locking recesses, can by the switch operating element and a tumbler are provided by the contact force ensures that the switch actuating element engages in the latching recess and thereby blocks the rotation of the cam.

In einer Ausführungsart weist die Zuhalteeinrichtung einen Elektromagneten auf, der koaxial zu dem Schalterbetätigungselement angeordnet ist.
Dadurch ist eine besonders platzsparende und vorzugsweise langgestreckte Bauform der Vorrichtung erreichbar. Vorzugsweise überdeckt eine Spule des Elektromagneten mindestens abschnittsweise das Schalterbetätigungselement, das seinerseits als Anker des Elektromagneten ausgebildet sein kann.In one embodiment, the locking device comprises an electromagnet which is arranged coaxially with the switch actuating element.
As a result, a particularly space-saving and preferably elongated design of the device can be achieved. Preferably, a coil of the electromagnet at least partially covers the switch actuating element, which in turn may be formed as an armature of the electromagnet.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnungen mehrere Ausführungsbeispiele im Einzelnen beschrieben sind. Dabei können die in den Ansprüchen und in der Beschreibung erwähnten Merkmale jeweils einzeln für sich oder in beliebiger Kombination erfindungswesentlich sein.

Fig. 1
zeigt eine schematische Draufsicht auf eine Gesamtanordnung mit einer erfindungsgemäßen Vorrichtung,
Fig. 2 bis 5
zeigen eine erfindungsgemäße Vorrichtung in vier unterschiedlichen Zuständen.
Further advantages, features and details of the invention will become apparent from the subclaims and the following description in which several embodiments are described in detail with reference to the drawings. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination.
Fig. 1
shows a schematic plan view of an overall arrangement with a device according to the invention,
Fig. 2 to 5
show a device according to the invention in four different states.

Die Fig. 1 zeigt eine schematische Draufsicht auf eine Gesamtanordnung mit einer erfindungsgemäßen Vorrichtung 1 zum Überwachen des Zustandes einer Schutzeinrichtung 2 einer Maschine 3, insbesondere des geschlossenen Zustandes einer Schutztür, mit der eine Raumtrenneinrichtung verschließbar ist, um beispielsweise das Bedienpersonal vor einer Gefährdung durch die im Betrieb befindliche Maschine 3 zu schützen. Die Einrichtung 2 weist ein erstes Teil 4 auf, beispielsweise einen Rahmen für die Schutzeinrichtung 2. Das erste Teil 4 weist eine Öffnung 5 auf, die durch ein zweites Teil 6 schließbar ist, beispielsweise durch eine Schutztür, die entsprechend dem Doppelpfeil 10 gegenüber dem ersten Teil 4 bewegbar ist und durch Lagerelemente 11 beweglich gelagert ist. Die Vorrichtung 1 weist einen Sicherheitsschalter auf, der ein vorzugsweise am feststehenden ersten Teil 4 der Schutzeinrichtung 2 angeordnetes Schalterelement 7 und einen vorzugsweise am beweglichen zweiten Teil 6 angeordneten Betätiger 8 umfasst.The Fig. 1 shows a schematic plan view of an overall arrangement with a device 1 according to the invention for monitoring the state of a protective device 2 of a machine 3, in particular the closed state of a protective door, with a Room separation device is closed, for example, to protect the operating personnel from hazards caused by the machine 3 in operation. The device 2 has a first part 4, for example a frame for the protective device 2. The first part 4 has an opening 5 which can be closed by a second part 6, for example by a protective door corresponding to the double arrow 10 with respect to the first Part 4 is movable and is movably supported by bearing elements 11. The device 1 has a safety switch which comprises a preferably arranged on the fixed first part 4 of the protection device 2 switch element 7 and a preferably arranged on the movable second part 6 actuator 8.

Die Fig. 2 bis 5 zeigen eine erfindungsgemäße Vorrichtung 1 zum Überwachen des Zustandes der Schutzeinrichtung 2 der Maschine 4 in vier unterschiedlichen Zuständen. Die Vorrichtung 1 weist eine im regulären Betriebszustand um die Drehachse 20 drehbare Kurvenscheibe 12 auf, die von dem (nicht dargestellten) Betätiger 8 in Richtung des Doppelpfeils 19 drehbar ist. Ein Schalterbetätigungselement 14 ist aufgrund der Wirkung eines Kraftspeichers 16, beispielsweise einer Druckfeder, in Anlage an der auf der Außenumfangsfläche von der Kurvenscheibe 12 gebildeten Kurvenbahn 15 gehalten. Aufgrund der von einer Kreisbahn um die Drehachse 20 mindestens abschnittsweise abweichenden Kurvenbahn 15 kommt es zu einer Verschiebung des in der Vorrichtung 1 verschiebbar gelagerten Schalterbetätigungselement 14 entlang seiner Längsachse. Auf seiner Außenfläche weist das Schalterbetätigungselement 14 mindestens abschnittsweise eine Kontur auf, die eine weitere Kurvenbahn 17 bildet, an welcher der Schaltstößel 21 eines Zwangsöffnerkontakts 18 mittels eines weiteren Kraftspeichers 23 in Anlage gehalten ist.The Fig. 2 to 5 show a device 1 according to the invention for monitoring the state of the protective device 2 of the machine 4 in four different states. The device 1 has a cam disk 12 which is rotatable about the axis of rotation 20 in the regular operating state and which is rotatable in the direction of the double arrow 19 by the actuator 8 (not shown). A switch operating element 14 is held in abutment with the cam track 15 formed on the outer peripheral surface of the cam 12 due to the action of an energy accumulator 16, for example a compression spring. Due to the curved path 15, which deviates at least in sections from a circular path about the axis of rotation 20, there is a displacement of the switch actuating element 14 displaceably mounted in the device 1 along its longitudinal axis. On its outer surface, the switch actuating element 14 at least in sections on a contour which forms a further cam track 17, on which the switching plunger 21 of a positive contactor 18 is held by means of a further force accumulator 23 in abutment.

Die in den Fig. 2 bis 5 dargestellten Komponenten der Vorrichtung 1 sind in einem nicht dargestellten Schaltergehäuse untergebracht, wobei vorzugsweise die Kurvenscheibe 12 in einem Schalterkopfgehäuse angeordnet ist, das lösbar mit einem Schaltergrundgehäuse verbindbar ist, in dem u. a. das Schalterbetätigungselement 14 und der Zwangsöffnerkontakt 18 angeordnet sind. Die Trennlinie 25 zeigt symbolisch die Trennung zwischen dem Schalterkopfgehäuse (oben) und dem Schaltergrundgehäuse (unten).The in the Fig. 2 to 5 shown components of the device 1 are housed in a switch housing, not shown, wherein preferably the cam 12 is arranged in a switch head housing, which is detachably connectable to a switch base housing, in which inter alia, the switch actuator 14 and the Zwangsöffnerkontakt 18 are arranged. The dividing line 25 symbolically shows the separation between the switch head housing (top) and the switch base housing (bottom).

In dem in der Fig. 2 dargestellten Zustand ist die Schutzeinrichtung 2 nicht geschlossen und daher der Betätiger 8 nicht in die Vorrichtung 1 eingeführt. Dementsprechend ist der Zwangsöffnerkontakt 18 nicht geschlossen und die Vorrichtung 1 signalisiert an die übergeordnete Steuereinrichtung den offenen Zustand der Schutzeinrichtung 2.In the in the Fig. 2 illustrated state, the protection device 2 is not closed and therefore the actuator 8 is not inserted into the device 1. Accordingly, the positive opener contact 18 is not closed and the device 1 signals to the higher-level control device the open state of the protective device 2.

Die Fig. 3 zeigt die Vorrichtung 1 in einem Zustand, in welchem die Schutzeinrichtung 2 geschlossen ist und dementsprechend der Betätiger 8 die Kurvenscheibe 12 um etwa 90° entgegen dem Uhrzeigersinn gedreht hat. Dadurch kommt die Rastnut 13 in der Kurvenscheibe 12 gegenüber dem axialen Ende des Schalterbetätigungselements 14 zu liegen, woraufhin das Schalterbetätigungselement 14 aufgrund der Anlagekraft des Kraftspeichers 16 in die Rastnut 13 eingreift. Durch die damit verbundene Verschiebung des Schalterbetätigungselements 14 in Richtung des Pfeils 27 wandert der Schaltstößel 21 entlang der weiteren Kurvenbahn 17 und tritt aufgrund der Wirkung des weiteren Kraftspeichers 23 in die Vertiefung der weiteren Kurvenbahn 17 ein. Dadurch wird der Zwangsöffnerkontakt 18 geschlossen und die Vorrichtung 1 signalisiert dadurch den geschlossenen Zustand der Schutzeinrichtung 2.The Fig. 3 shows the device 1 in a state in which the protective device 2 is closed and, accordingly, the actuator 8 has rotated the cam 12 by approximately 90 ° counterclockwise. As a result, the latching groove 13 in the cam 12 comes to lie opposite the axial end of the switch actuating element 14, whereupon the switch actuating element 14 engages in the latching groove 13 due to the contact force of the energy accumulator 16. Due to the associated displacement of the switch actuating element 14 in the direction of the arrow 27, the switch plunger 21 travels along the further curved path 17 and, due to the action of the further energy accumulator 23, enters the depression of the further curved path 17. As a result, the positive opener contact 18 is closed and the device 1 thereby signals the closed state of the protective device 2.

Das dargestellte Ausführungsbeispiel weist auch eine Zuhalteeinrichtung auf, weil durch das Eingreifen des Schalterbetätigungselement 14 in die Rastnut 13 die Kurvenscheibe 12 gegenüber einer Drehbewegung blockiert ist und dadurch der Betätiger 8 nicht aus dem Schalterkopf herausgeführt werden kann, und demzufolge die Schutzeinrichtung nicht geöffnet werden kann. Die Zuhaltung kann vorzugsweise durch Formschluss erfolgen, insbesondere indem die Rastnut 13 eine selbstsperrende Rastflanke aufweist. Die Zuhaltung kann aufgehoben werden mittels der Wirkung des Elektromagneten 40, der beim Bestromen auf das in einem Abschnitt 38 magnetisierbaren Schalterbetätigungselement 14 einwirkt und das Schalterbetätigungselement 14 entgegen der Wirkung des Kraftspeichers 16 in Richtung entgegen des Pfeils 27 verschiebt und dadurch das Schalterbetätigungselement außer Eingriff mit der Rastnut 13 kommt.The illustrated embodiment also includes a locking means, because by the engagement of the switch actuating element 14 in the locking groove 13, the cam 12 is blocked against rotation and thereby the actuator 8 can not be led out of the switch head, and therefore the protective device can not be opened. The tumbler can preferably be done by positive locking, in particular by the locking groove 13 has a self-locking latching edge. The tumbler can be canceled by the action of the electromagnet 40, which acts on the magnetizable in a section 38 switch actuator 14 during energization and the switch actuator 14 against the action of the energy accumulator 16 moves in the direction opposite to the arrow 27 and thereby disengages the switch actuator with the Locking groove 13 is coming.

Die Fig. 4 zeigt die Vorrichtung 1 in einem Zustand, in dem aufgrund einer übermäßigen Krafteinwirkung, beispielsweise durch ein gewaltsames Ziehen an dem Betätiger 8 im geschlossenen Zustand der Schutzeinrichtung 2, das Schalterbetätigungselement 14 derart beschädigt wurde, dass ein der Kurvenscheibe 12 zugewandtes Ende des Schalterbetätigungselements 14 entlang der in der Fig. 3 gepunktet angedeuteten Bruchlinie 36 abgebrochen ist. Aufgrund der auf das gegenüberliegende axiale Ende des Schalterbetätigungselements 14 wirkenden Anlagekraft des Kraftspeichers 16 wird der Stößel nach wie vor in der Rastausnehmung 13 gehalten, mithin ist von außen der Vorrichtung 1 nicht anzusehen, dass das Schalterbetätigungselement 14 beschädigt ist. Durch die vorliegende Erfindung wird allerdings aufgrund des geöffneten Zwangsöffnerkontakts 18 von der Vorrichtung 1 ein geöffneter Zustand der Schutzeinrichtung 2 signalisiert, mithin wird der übergeordneten Steuereinrichtung signalisiert, dass die innerhalb der Schutzeinrichtung 2 angeordnete Maschine 3 nicht in Betrieb genommen werden darf oder ein Betrieb der Maschine 3 unterbrochen werden muss. Dies wird dadurch erreicht, dass die weitere Kurvenbahn 17 nach der abschnittsweisen Vertiefung eine erneute Anhebung aufweist, so dass der Schaltstößel 21 zwangsweise bewegt wird und dadurch der Zwangsöffnerkontakt 18 formschlüssig geöffnet wird.The Fig. 4 shows the device 1 in a state in which due to an excessive force, for example by a forced pulling on the actuator 8 in the closed state of the protective device 2, the switch actuator 14 has been damaged such that a cam plate 12 facing the end of the switch actuator 14 along the in the Fig. 3 broken line indicated broken line 36 is canceled. Due to the force acting on the opposite axial end of the switch actuating element 14 contact force of the energy accumulator 16, the plunger is still held in the recess 13, thus, from the outside of the device 1 is not to be considered that the switch actuator 14 is damaged. Due to the present invention, however, an opened state of the protective device 2 is signaled by the device 1 due to the open positive-opener contact 18, and consequently the higher-level control device is signaled that that the machine 3 arranged inside the protective device 2 may not be put into operation or that an operation of the machine 3 has to be interrupted. This is achieved by virtue of the fact that the further cam track 17 has a renewed lift after the section-wise depression, so that the switch plunger 21 is forcibly moved and thereby the positive-opening contact 18 is opened in a form-fitting manner.

Die Fig. 5 zeigt einen Zustand der Vorrichtung 1, in dem ein irregulärer Betriebszustand dadurch eingetreten ist, dass die Kurvenscheibe 12 gegebenenfalls komplett mit dem Schalterkopfgehäuse von dem Schaltergrundgehäuse abgetrennt wurde und somit das Widerlager für die Anlagekraft des Schalterbetätigungsstößel 14 entfallen ist. Dementsprechend tritt das Schalterbetätigungselement 14 weiter aus dem Schaltergrundgehäuse aus, als dies im regulären Betriebszustand der Fall sein kann. Auch in diesem Zustand signalisiert die Vorrichtung 1 aufgrund der Kontur der weiteren Kurvenbahn 17 einen nicht-geschlossenen Zustand der Schutzeinrichtung 2.The Fig. 5 shows a state of the device 1, in which an irregular operating state has occurred in that the cam plate 12 was possibly separated completely with the switch head housing of the switch base housing and thus the abutment for the contact force of the switch actuating plunger 14 is omitted. Accordingly, the switch operating member 14 further out of the switch base housing, as may be the case in the regular operating condition. Even in this state, the device 1 signals a non-closed state of the protective device 2 due to the contour of the further curved path 17.

In der Fig. 5 ist außerdem ein weiteres Ausführungsbeispiel für die weitere Kurvenbahn 17 dargestellt, die in einem zweiten Abschnitt eine weitere Vertiefung 29 aufweist, die weniger tief als die erste Vertiefung ist und dadurch der Schaltstößel 21 beim Eintreten in die weitere Vertiefung 29 den Zwangsöffnerkontakt 18 im offenen Zustand hält. Weiterhin unterscheidet sich die weitere Vertiefung 29 dahingehend, dass sie von mindestens einer Rastflanke begrenzt ist, die verhindert, dass allein durch Verschieben des Schalterbetätigungselements 14 der Schaltstößel 21 aus der weiteren Vertiefung 29 austreten kann. Insbesondere ist dadurch verhindert, dass durch eine Kraft von oben auf das Schalterbetätigungselement 14 der Zwangsöffnerkontakt 18 geschlossen werden kann und dadurch ein geschlossener Zustand der Schutzeinrichtung 2 signalisierbar wäre.In the Fig. 5 In addition, another embodiment of the further cam track 17 is shown, which has a further recess 29 in a second section, which is less deep than the first recess and thereby the switch plunger 21 when entering the further recess 29 keeps the Zwangsöffnerkontakt 18 in the open state , Furthermore, the further recess 29 differs in that it is delimited by at least one latching edge, which prevents the switch plunger 21 from being able to exit the further recess 29 solely by displacing the switch actuating element 14. In particular, this prevents that the positive-action contact 18 is closed by a force from above on the switch actuating element 14 can be and thus a closed state of the protection device 2 could be signaled.

Claims (9)

  1. An apparatus for monitoring the state of a protection device (2) of a machine (4), in particular a safety switch for monitoring the closed state of a protection door or the like, the apparatus (1) having an actuator (8) that can be fixed to the protection device (2) and a switch housing with a switch actuation element (14) mounted moveably within the latter, and the switch actuation element 14) being held by a contact force in contact with a curved track (15) that can be moved by the actuator (8) when closing and opening the protection device (2), and in a regular operating state of the apparatus (1) the closed state of the protection device (2) being able to be signalled by the apparatus (1) by means of pre-defined relative positions of the switch actuation element (14) in relation to the curved track (15), and the switch actuation element (14) being able to be moved into a fail-safe position in an irregular operating state occurring, for example, as a result of excessive force acting on the curved track (15) and/or the switch actuation element (14) by the contact force acting on the switch actuation element (14), and in this fail-safe position of the switch actuation element (14) the apparatus (1) signalling the non-closed state of the protection device (2), and the apparatus (1) having an electrical switch element with a positively driven NC contact (18), and in the fail-safe position of the switch actuation element (14) the positively driven NC contact (18) being open, characterised in that the switch actuation element (14) has a further curved track (17) in contact with which a switch actuating rod (21) of the positively driven NC contact (18) is held.
  2. The apparatus (1) according to Claim 1, characterised in that the switch actuation element (14) can no longer be moved out of the fail-safe position by means of the actuator (8) into a position in which the apparatus (1) signals the closed state of the protection device (2).
  3. The apparatus (1) according to Claim 1 or 2, characterised in that in the fail-safe position the switch actuation element (14) passes further out of the switch housing, in particular a switch base housing, than can be the case in the regular operating state.
  4. The apparatus (1) according to any of the preceding claims, characterised in that the switch actuation element (14) is blocked in the fail-safe position and maintains this blocked position independently of the position of the actuator (8).
  5. The apparatus (1) according to any of the preceding claims, characterised in that the apparatus (1) has a blocking device by means of which the closed state of the protection device (2) can be locked releaseably.
  6. The apparatus (1) according to any of the preceding claims, characterised in that the further curved track (17) has an engagement edge in which the switch actuating rod (21) of the positively driven NC contact (18) engages in the fail-safe position of the switch actuation element (14).
  7. The apparatus (1) according to any of the preceding claims, characterised in that the apparatus (1) has a rotatably mounted cam disc (12) in the switch housing, in particular in a switch head housing that can be fixed to a switch base housing, which cam disc has the curved track (15) with which the switch actuation element (14) is held in contact.
  8. The apparatus (1) according to any of the preceding claims, characterised in that the blocking device has an electromagnet (40), and that the electromagnet (40) is arranged coaxially to the switch actuation element (14).
  9. The apparatus (1) according to any of the preceding claims, characterised in that the switch actuation element (14) at least partially forms an anchor of an electromagnet (40) of the blocking device.
EP20090012124 2008-09-25 2009-09-24 Device for monitoring the status of a protection device of a machine Not-in-force EP2184755B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810050892 DE102008050892A1 (en) 2008-09-25 2008-09-25 Device for monitoring the state of a protective device of a machine

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EP2184755A1 EP2184755A1 (en) 2010-05-12
EP2184755B1 true EP2184755B1 (en) 2013-04-10

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DE (1) DE102008050892A1 (en)
ES (1) ES2403596T3 (en)

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Publication number Priority date Publication date Assignee Title
DE202020100575U1 (en) * 2020-02-03 2021-05-05 Steute Technologies Gmbh & Co. Kg Safety interlock

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Publication number Priority date Publication date Assignee Title
JPH0674301A (en) * 1992-08-28 1994-03-15 Nissan Motor Co Ltd Flywheel
DE4328297C1 (en) 1993-08-23 1995-02-23 Euchner & Co Safety switch
US6720508B2 (en) * 2001-07-06 2004-04-13 Omron Corporation Door switches
DE10234984B4 (en) * 2002-07-31 2006-07-06 Siemens Ag switching device
DE102004038488B4 (en) * 2004-08-07 2006-06-14 Euchner Gmbh + Co. Kg Monitoring system for controlling access to such as a machine uses a switch that is coupled to an actuator on the door
JP4522291B2 (en) * 2005-03-08 2010-08-11 Ｉｄｅｃ株式会社 Safety switch
GB0613423D0 (en) * 2006-07-06 2006-08-16 Eja Ltd Safety switch
GB0705174D0 (en) * 2007-03-17 2007-04-25 Eja Ltd Safety switch

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DE102008050892A1 (en) 2010-04-08
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