EP2242074B1 - Dispositif de surveillance de l'état d'un dispositif de protection d'une machine - Google Patents

Dispositif de surveillance de l'état d'un dispositif de protection d'une machine Download PDF

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Publication number
EP2242074B1
EP2242074B1 EP10006387A EP10006387A EP2242074B1 EP 2242074 B1 EP2242074 B1 EP 2242074B1 EP 10006387 A EP10006387 A EP 10006387A EP 10006387 A EP10006387 A EP 10006387A EP 2242074 B1 EP2242074 B1 EP 2242074B1
Authority
EP
European Patent Office
Prior art keywords
switch
actuation element
switch actuation
actuator
fail
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
Application number
EP10006387A
Other languages
German (de)
English (en)
Other versions
EP2242074A1 (fr
Inventor
Erik BÄCHLE
Tobias KÖNIG
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.)
Euchner GmbH and Co KG
Original Assignee
Euchner 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.)
Filing date
Publication date
Priority claimed from DE200810050893 external-priority patent/DE102008050893A1/de
Priority claimed from DE102008057223A external-priority patent/DE102008057223A1/de
Application filed by Euchner GmbH and Co KG filed Critical Euchner GmbH and Co KG
Publication of EP2242074A1 publication Critical patent/EP2242074A1/fr
Application granted granted Critical
Publication of EP2242074B1 publication Critical patent/EP2242074B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01H27/007—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 the switch being lockable by remote control, e.g. by electromagnet

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, with a Zuhaltefunktion for the protective device.
  • 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 Zuhaltefunktion, ie that the actuator is locked 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 Herstellüng, assembly and maintenance of the device should be simplified and thereby save time and money.
  • the excessive force on the operator may be exerted by the operator forcibly pulling the guard door to which the actuator is attached.
  • this may lead to the switch actuator is transferred to a position in which, although properly the no longer held and no longer closed state of the protective device is signaled, but the safety switch is damaged; in a subsequent closing of the protection then there is a risk that the damaged safety switch does not provide a hundred percent functional guarantee more, but that still closed and possibly also the locked state can be signaled.
  • the switch operating element is placed in a fail-safe position at an inadmissibly-excessive force, from which the switch operating element is no longer allowed Highwaybar 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 retains this locked position regardless of the Position of the actuator at.
  • the switch actuating element can be positively and / or positively connected to a blocking element arranged in the switch housing.
  • a positive connection is achieved in that the switch actuating element or a portion thereof is displaced or deflected by the excessive force such that the switch actuating element comes into positive engagement with a preferably fixedly arranged in the switch housing blocking element and thereby the fail-safe position the switch operating element is blocked.
  • a frictional connection is achieved in that the switch actuating element can be brought by the excessive force in a clamping connection with the blocking element, which allows no further movement of the switch actuating element.
  • the switch actuating element may have a thickened portion, in particular a thickened and preferably mushroom-shaped end portion, with which the switch actuating element can be brought into clamping connection with the blocking element.
  • the blocking element is formed by a guide element for, for example, a linearly movable mounting of the switch actuating element in the switch housing.
  • the switch actuating element may be at least partially cylindrical, in particular circular cylindrical.
  • a bearing sleeve or bearing bush can be arranged in the switch housing, which preferably has at least one slot at the end. Due to the excessive force on the actuator whose end, which engages, for example, in the closed and locked state of the protective device in a recess of a cam track, be plastically deformable, especially bendable. As a result of this bending, a section of the switch actuating element in the fail-safe position can be inserted into a slot of the bearing sleeve and can be clamped there in a clamping manner.
  • the switch actuating element has a predetermined breaking point at which a first portion of the switch actuating element can be separated by the excessive force on the actuator. This separation can in principle also take place when the device has no locking device. In one embodiment, however, the device has a locking device, and the separation of the first portion is carried out by canceling the locking function, in particular by a force exerted by the actuator on the device, for example, when the actuated is pulled. In this case, the switch actuating element can first deform, in particular plastically deform, and then be separated.
  • a second, remaining portion of the switch actuating element can be fixed in a clamping manner on the device as a result of the forces occurring during separation, in particular clampingly fixable to the blocking element.
  • the blocking element can be formed for example by a guide element, in particular by a guide sleeve.
  • a burr may form on the second section, for example, which can be brought into clamping engagement with the blocking element, in particular with the guide element.
  • the second portion of the switch actuating element in the clamped state in the fail-safe position in which the device signals the non-locked state of the protective device. This is Prevents that by re-inserting the actuator, the device signals the locked state of the protective device, although the switch actuator was damaged by the excessive force, in particular the first section has been separated.
  • the switch actuator is multi-piece and includes a first separable portion and a second remaining portion.
  • the predetermined breaking point is arranged by the transition from the first to the second section.
  • the second section may be screwed or clamped to the first section, in particular screwed and then glued.
  • 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.
  • General contact contacts are in principle 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. This so-called positive opening can be achieved by a positive, rigid connection between the switch plunger and the contact bridge.
  • ZwangsöffnerAuthe Preferably Zwangsöffnerminde have no elastic parts.
  • 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 detent recesses, a tumbler can also be provided by the switch actuating element in that the contact force ensures that the switch actuating element engages in the detent 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 safety door, with a room divider is closed, for example, the operator from a threat from the machine in operation 3 to protect.
  • 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 on, which preferably comprises a fixed to the first part 4 of the protective device 2 arranged switch element 7 and a preferably on the movable second part 6-arranged 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 switch base housing 22, in which the electrical switch element 7 of the device 1 is arranged, of which in the embodiment, only the positive contactor 18 is shown.
  • On the switch base housing 22 is a switch head housing 24 releasably fixed, in which a rotatably mounted about the rotation axis 20 cam 12 is arranged.
  • the switch head housing 24 has two mutually perpendicular insertion channels 26, 28 for in the Fig. 2 to 5 not shown actuator 8.
  • the switch actuator 14 is held with its axial end in radial contact with the cam 12. Due to the deviating from the circular cam track 15, the switch actuating element 14 is displaced during rotation of the cam 12 in its longitudinal direction.
  • the switch actuating element 14 is guided linearly movably in a guide element 30, which is arranged in the switch base housing 22 and is preferably at least partially hollow-cylindrical.
  • An energy accumulator 16 acts on the switch actuator 14 such that it is held in contact with the cam 12.
  • An energizable electromagnet 40 can cancel the contact force of the energy accumulator 16.
  • the Fig. 2 shows the device 1 in a state in which the protective device 2 is not closed and therefore the actuator 8 is not inserted into the switch head housing 24.
  • the shows Fig. 3 the state of the device 1, in which the protective device 2 is closed and thereby the (not shown) actuator 8 is inserted into the switch head housing 24 and the cam 12, starting from the in Fig. 2 has shown rotated home position about 90 ° counterclockwise. This will be at the
  • the switch actuating element 14 engages in the latching groove 13, thereby closing the positive contact 18.
  • the protective device 2 is locked by the device 1 and the machine 4 arranged inside the protective device 2 can be connected downstream of one of the devices 1 Control device are put into operation.
  • a lifting of the tumbler is effected by the electromagnet 40, which pulls the switch actuator 14 as an armature of the electromagnet 40 against the action of the energy accumulator 16 from the locking groove 13 during energization.
  • the Fig. 4 shows a state of the device 1, in which by excessive force on the second part 6 of the protective device 2, for example on the guard, by means of the actuator 8 and thus the cam 12 and a high force is exerted on the switch actuator 14 through which the axial end of the switch actuating element 14 initially possibly also elastic, but plastically deformed in the course.
  • the switch operating element 14 remains first still in his the guard 2 zuhaltenden position and thereby keeps the positive contact 18 closed.
  • the switch operating member 14 By the deformation of the switch operating member 14, the axially end-side portion thereof comes into clamping engagement with a slot 32 disposed on the axial end side of the guide member 30. Thereby, the switch operating member 14 is brought into a fail-safe position, out of which the switch operating member 14 by means of the actuator 8 is no longer convertible into a position in which the device 1 signals the locked state of the protective device 2.
  • FIG. 6 shows a perspective view of the guide member 30 having a formed by an inner sleeve portion 33 hollow cylindrical guide surface 31 for the switch actuator 14 in the center.
  • the guide element 30 in the region of the guide surface 31 a total of four, each offset by an angle of 90 ° to each other arranged slots 32, which are introduced into the inner sleeve portion 33.
  • Radially on the outside, the guide member 30 has a ring 34, wherein in the annular receiving space between the inner sleeve portion 33 and ring 34, a connection pin of the switch head housing 24 is inserted.
  • the guide element 30 has a sleeve-shaped section 35 which has a groove 36 or an external thread on the outside, by means of which the guide element 30 can be fixed in a sealing manner to the switch base housing 22.
  • the Fig. 7 shows a perspective view of the guide member together with the switch actuating element 14, which has at its the switch head housing 24 end portion facing first a first portion 37 with a smaller outer diameter and then a second portion 38 with again larger outer diameter.
  • the first portion 37 may serve to allow the plastic deformation to the extent that the second portion 38 in one of the slots 32 is clamped fixable without the switch actuator 14 breaks in this deformation.
  • the Fig. 8 to 10 show a second embodiment of the device 1 according to the invention in three different states.
  • the switch base housing is not shown, but can according to the switch base housing 22 of the first embodiment of Fig. 2 to 5 be designed. The same applies to the energy storage 16.
  • the Fig. 8 shows the device 1 in a state in which the protective device 2 is not closed and therefore the actuator 8 is not inserted into the switch head housing 24.
  • the shows Fig. 9 the state of the device 1, in which the protective device 2 is closed and thereby the actuator 8 is inserted into the switch head housing 24 and the cam 12, starting from in the Fig. 8 has shown rotated home position about 90 ° counterclockwise. Thereby, the locking groove 13 disposed on the outer peripheral surface of the cam plate 12 is rotated in a position opposite to the switch operating member 114. Due to the effect of the force accumulator 16 (not shown) ( Fig.
  • the protective device 2 is locked by the device 1 and the machine 4 arranged inside the protective device 2 can be put into operation by a control device connected downstream of the device.
  • a lifting of the tumbler is effected by the electromagnet 40, which pulls out when energizing the switch operating element 114 as an armature of the electromagnet 40 against the action of the energy accumulator 16 from the locking groove 13.
  • the Fig. 10 shows a state of the device 1, in which by excessive force on the second part 6 of the protective device 2, for example on the guard, by means of the actuator 8 and thus the cam 12 and a high force is exerted on the switch actuator 114, through which a first Section 114a ( Fig. 11 ) is detachable from the switch operating element 114.
  • the separation takes place at a predetermined breaking point 142, which is formed by a transition of the first portion 114a to the second portion 114b on the outer peripheral surface of the switching wheel 12 facing the end portion of the switch actuating element 114.
  • This condition is also signaled by the opening of the positive opener contact 18, since it is ensured by the predetermined breaking point that the remaining portion 114b still has a sufficient length, so that when forced contact of the remaining portion 114b on the cam 12 of the positive contact 18 remains open.
  • the Fig. 11 shows an enlarged view of the actuator facing the end of the switch actuating element 114.
  • the first portion 114a is an at least partially cylindrical body and in particular has two sections.
  • a first partial section facing the second section 114b has an external thread with which the first section 114a can be screwed into a corresponding threaded bore of the second section 114b.
  • the two sections 114a, 114b are subsequently glued together.
  • the second section 114b is in turn cylindrical in sections and in particular has a cylindrical outer surface 146, by means of which the switch actuating element 114 is guided axially movably in the guide element 130. Near its end facing the first portion 114a, the second portion 114b tapers in a pin-like manner, the outer diameter in the tapered end portion coinciding with the outer diameter of the second portion of the first portion 114a, so that the transition from the first portion 114a to the second portion 114b is flush.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Crushing And Grinding (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)

Claims (15)

  1. Dispositif (1) de contrôle de l'état d'un dispositif (2) de protection d'une machine (4), notamment interrupteur de sécurité pour contrôler qu'une porte de protection ou analogue est fermée, dans lequel le dispositif (1) comporte un boîtier (22, 24) d'interrupteur et un actionneur (8), qui, lorsque le dispositif (2) de protection est fermé, coopère avec un élément (14) d'actionnement de l'interrupteur monté mobile dans le boîtier (22, 24) de l'interrupteur et ainsi l'état fermé du dispositif (2) de protection peut être signalé, et dans lequel le dispositif (1) comporte un dispositif de verrouillage, par lequel l'état fermé du dispositif (2) de protection peut être bloqué avec possibilité de déblocage, et dans lequel, par une force excédentaire sur l'actionneur (8) à l'encontre de l'action du dispositif de verrouillage, l'élément (14) de fonctionnement de l'interrupteur peut être mis dans une position fail-safe, à partir de laquelle l'élément (14) d'actionnement de l'interrupteur ne peut plus au moyen de l'actionneur (8) passer dans une position dans laquelle le dispositif (1) signale l'état verrouillé du dispositif (2) de protection, et dans lequel le dispositif (1) signale dans cette position fail-safe de l'élément d'actionnement de l'interrupteur l'état non verrouillé du dispositif (2) de protection, caractérisé en ce que l'élément (14) d'actionnement de l'interrupteur a un point destiné à se rompre où, par la force excédentaire sur l'actionneur (8), un premier segment de l'élément (14) d'actionnement de l'interrupteur peut être séparé et en ce que, en conséquence des forces se produisant lors de la séparation, un deuxième segment de l'élément (14) d'actionnement de l'interrupteur peut être fixé avec serrage dans la position fail-safe.
  2. Dispositif (1) suivant la revendication 1, caractérisé en ce qu'à la position fail-safe l'élément (14) d'actionnement de l'interrupteur est bloqué et cette position bloquée est maintenue indépendamment de la position de l'actionneur (8).
  3. Dispositif (1) suivant la revendication 1 ou 2, caractérisé en ce qu'à la position fail-safe l'élément (14) d'actionnement de l'interrupteur est relié à complémentarité de force et/ou de forme avec un élément de blocage disposé dans le boîtier (22, 24) de l'interrupteur.
  4. Dispositif (1) suivant la revendication 3, caractérisé en ce que, par la force excédentaire sur l'actionneur (8), l'élément (14) d'actionnement de l'interrupteur peut être mis en liaison de serrage avec l'élément de blocage.
  5. Dispositif (1) suivant la revendication 4, caractérisé en ce que l'élément (14) d'actionnement de l'interrupteur a un segment épaissi, notamment un segment d'extrémité épaissie, par lequel l'élément (14) d'actionnement de l'interrupteur peut être mis en liaison de serrage avec l'élément de blocage.
  6. Dispositif (1) suivant l'une des revendications 3 à 5, caractérisé en ce que l'élément de blocage est formé par un élément (30) de guidage pour le montage mobile de l'élément (14) d'actionnement de l'interrupteur.
  7. Dispositif (1) suivant l'une des revendications 3 à 6, caractérisé en ce que l'élément de blocage est formé par un manchon, qui a, de préférence du côté de l'extrémité, au moins une fente (32), et en ce que l'élément (14) d'actionnement de l'interrupteur est introduit dans la position fail-safe dans une fente (32) et y est fixé avec serrage.
  8. Dispositif (1) suivant l'une des revendications précédentes, caractérisé en ce que, par la force excédentaire sur l'actionneur (8), l'élément (14) d'actionnement de l'interrupteur peut être déformé plastiquement.
  9. Dispositif (1) suivant l'une des revendications précédentes, caractérisé en ce que, en conséquence des forces se produisant lors de la séparation, le deuxième segment de l'élément (14) d'actionnement de l'interrupteur peut être fixé avec serrage sur un élément de blocage.
  10. Dispositif (1) suivant la revendication 9, caractérisé en ce que, par la position du point destiné à se rompre, le deuxième segment de l'élément (14) d'actionnement de l'interrupteur est, à l'état fixé de serrage, dans la position fail-safe, dans laquelle le dispositif (1) signale l'état non verrouillé du dispositif (2) de protection.
  11. Dispositif (1) suivant l'une des revendications précédentes, caractérisé en ce que l'élément (14) d'actionnement de l'interrupteur est en plusieurs pièces et en ce que le passage d'un premier segment pouvant être séparé à un deuxième segment subsistant forme un point destiné à se rompre.
  12. Dispositif (1) suivant l'une des revendications précédentes, caractérisé en ce que le dispositif (1) comporte un élément électrique de commutation ayant un contact (18) de repos forcé et en ce que, dans la position fail-safe de l'élément (14) d'actionnement de l'interrupteur, le contact (18) de repos forcé est ouvert.
  13. Dispositif (1) suivant l'une des revendications précédentes, caractérisé en ce que le dispositif (1) comporte une came (12), qui est montée tournante dans le boîtier (22, 24) de l'interrupteur, notamment dans un boîtier (24) de tête de l'interrupteur pouvant être fixé sur un boîtier (22) de base de l'interrupteur, et sur laquelle l'élément (14) d'actionnement de l'interrupteur est maintenu en contact.
  14. Dispositif (1) suivant l'une des revendications précédentes, caractérisé en ce que le dispositif de verrouillage comporte un électroaimant (40) et en ce que l'électroaimant (40) est monté coaxialement à l'élément (14) d'actionnement de l'interrupteur.
  15. Dispositif (1) suivant l'une des revendications précédentes, caractérisé en ce que l'élément (14) d'actionnement de l'interrupteur forme, au moins par segment, une culasse d'un électroaimant (40) du dispositif de verrouillage.
EP10006387A 2008-09-25 2009-09-24 Dispositif de surveillance de l'état d'un dispositif de protection d'une machine Not-in-force EP2242074B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200810050893 DE102008050893A1 (de) 2008-09-25 2008-09-25 Vorrichtung zum Überwachen des Zustandes einer Schutzeinrichtung einer Maschine
DE102008057223A DE102008057223A1 (de) 2008-11-06 2008-11-06 Vorrichtung zum Überwachen des Zustandes einer Schutzeinrichtung einer Maschine
EP09012130A EP2184756B1 (fr) 2008-09-25 2009-09-24 Dispositif de surveillance de l'état d'un dispositif de protection d'une machine

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP09012130.2 Division 2009-09-24

Publications (2)

Publication Number Publication Date
EP2242074A1 EP2242074A1 (fr) 2010-10-20
EP2242074B1 true EP2242074B1 (fr) 2011-08-03

Family

ID=41397754

Family Applications (2)

Application Number Title Priority Date Filing Date
EP09012130A Not-in-force EP2184756B1 (fr) 2008-09-25 2009-09-24 Dispositif de surveillance de l'état d'un dispositif de protection d'une machine
EP10006387A Not-in-force EP2242074B1 (fr) 2008-09-25 2009-09-24 Dispositif de surveillance de l'état d'un dispositif de protection d'une machine

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP09012130A Not-in-force EP2184756B1 (fr) 2008-09-25 2009-09-24 Dispositif de surveillance de l'état d'un dispositif de protection d'une machine

Country Status (3)

Country Link
EP (2) EP2184756B1 (fr)
AT (2) ATE519214T1 (fr)
DE (1) DE502009000540D1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4328297C1 (de) 1993-08-23 1995-02-23 Euchner & Co Sicherheitsschalter
US6720508B2 (en) 2001-07-06 2004-04-13 Omron Corporation Door switches
JP4522291B2 (ja) * 2005-03-08 2010-08-11 Ｉｄｅｃ株式会社 安全スイッチ

Also Published As

Publication number Publication date
EP2242074A1 (fr) 2010-10-20
DE502009000540D1 (de) 2011-05-26
ATE519214T1 (de) 2011-08-15
EP2184756B1 (fr) 2011-04-13
ATE505804T1 (de) 2011-04-15
EP2184756A1 (fr) 2010-05-12

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