PatentDe  


Dokumentenidentifikation EP1376632 10.01.2008
EP-Veröffentlichungsnummer 0001376632
Titel Verriegelbares Schaltwerk
Anmelder Eja Ltd., Hindley Green, Wigan, GB
Erfinder Mohtasham, Mehdi, Astley, Manchester M29 4EP, GB
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60317737
Vertragsstaaten DE, FR, GB, IT
Sprache des Dokument EN
EP-Anmeldetag 16.06.2003
EP-Aktenzeichen 032537946
EP-Offenlegungsdatum 02.01.2004
EP date of grant 28.11.2007
Veröffentlichungstag im Patentblatt 10.01.2008
IPC-Hauptklasse H01H 27/00(2006.01)A, F, I, 20051017, B, H, EP

Beschreibung[en]

The present invention relates to a lockable switch mechanism which may be used in for example a machine guard to prevent the opening of a door of the machine guard until predetermined conditions have been established.

A lockable switch mechanism is described in US Patent No. 5,777,284 . That mechanism comprises a switch plunger which is mounted in a housing and is displaceable relative to the housing along a predetermined axis between a first unlocked position and a second locked position. A locking mechanism is provided for locking the switch plunger in the second position and the switch plunger actuates a switch mechanism as a result of movement of the switch plunger between the first and second positions. The locking mechanism comprises two pivotally mounted latches which are normally biased against the switch plunger so as to engage behind an axially facing surface defined by the switch plunger when the plunger has been moved to the second position. The latches can only be withdrawn so as to permit axial displacement of the switch plunger if a plate extending transversely of the switch plunger is displaced to a latch release position. Tzhe latch releasing plate is driven by a lever mechanism the position of which is controlled by a solenoid arranged to one side of the switch mechanism housing. This arrangement works well but is relatively bulky and complex.

Documents US-A-5 062 668 and DE 2 040 046 A disclose lockable switch mechanisms according to the preamble of claim 1.

It is an object of the present invention to provide an improved lockable switch mechanism.

According to the present invention, there is provided a lockable switch mechanism according to claim 1.

In contrast to the mechanism described in US Patent 5,777,284 , the mechanism in accordance with the present invention relies upon a first locking member which does not prevent axial displacement of the switch plunger unless a second locking member is moved into a locked position. This means that rather than providing a relatively complex mechanism to release a latch a relatively simple and compact mechanism can be provided which is positionable either so as to maintain the first locking member in a position in which axial displacement of the switch plunger is not permitted or in a position in which the first locking member can be simply displaced by axial movement of the switch plunger. All of the necessary components can be arranged along a common axis with the switch plunger axis in a compact and reliable assembly.

Preferably, the or each first locking member comprises a locking pin extending transversely relative to the axis of displacement of the switch plunger, the locking pin being spring biased towards the switch plunger in a direction perpendicular to the switch plunger axis. Two locking pins may be provided on opposite sides of the switch plunger. The locking pins may be mounted in a housing assembly defining an aperture through which the switch plunger extends, the locking pins being spring-biased towards each other from opposite sides of the aperture by springs supported in the housing assembly. The housing assembly may comprise a frame which receive the locking pins and springs and a cover plate which retains the locking pins and springs within the assembly.

Preferably, the or each second locking member comprises a locking arm which is displaceable in a direction parallel to the switch plunger axis and, when in the locked position, extends on the side of the first locking member remote from the switch plunger to prevent displacement of the first locking member in a direction away from the switch plunger axis.

The profile may be defined by an annular shoulder extending around the switch plunger. That shoulder may be tapered so as to readily lift the locking pins away from the switch plunger if the mechanism is not in the locked condition.

Two locking arms may be provided to lock respective locking pins against displacement relative to the switch plunger axis. The locking arms may extend from one end of a solenoid plunger which is arranged at one end of the switch plunger and is displaceable along the switch plunger axis by a solenoid winding within a solenoid housing. The solenoid may be arranged so that, when energised, the locking arms are displaced from the locked position, or alternatively may be arranged so that, when energised, the locking arms are displaced to the locked position.

A compression spring may be arranged between the switch and solenoid plungers to bias the plungers apart, and a compression spring may also be arranged between the solenoid plunger and the solenoid housing to bias the solenoid plunger towards the switch plunger. The switch plunger may be axially displaced by rotation of a cam from a datum position by insertion of an actuator into the mechanism, withdrawal of the actuator being prevented unless the cam is rotated back to the datum position, and such rotation being prevented by the locking mechanism if the or each second locking member is in the locked position.

An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

  • Figure 1 is a schematic cut-away view of a locking switch mechanism in accordance with the present invention with the switch in an unlocked condition;
  • Figure 2 illustrates the mechanism of Figure 1 after the insertion of an actuator to switch the mechanism and locking of the mechanism;
  • Figure 3 is a partial perspective view of some of the components of the mechanism of Figure 1 and 2 showing components in the positions adopted when the switch is unlocked as shown in Figure 1;
  • Figure 4 is a side view of the components of Figure 3;
  • Figure 5 is a partial perspective view of the components shown in Figures 3and 4 with those components in the switch locked position corresponding to Figure 2;
  • Figure 6 is a side view of the components shown in Figure 5;
  • Figure 7 shows the mechanism of Figures 1 to 6 after insertion of an actuator but before locking of the mechanism;
  • Figure 8 illustrates the application of a force to withdraw the actuator when the mechanism is locked;
  • Figure 9 illustrates the mechanism after unlocking of the mechanism and partial withdrawal of the actuator;
  • Figure 10 is a perspective view of assembled components of the locking mechanism and Figure 11 is an exploded view of the components making up the assembly of Figure 10;
  • Figure 12 is a sectional view through a solenoid plunger incorporated in the mechanism of Figures 1 to 11;
  • Figure 13 is a perspective view of a solenoid locking fork incorporated in the mechanism of Figures 1 to 12;
  • Figure 14 is a sectional view through the solenoid locking fork of Figure 13;
  • Figure 15 is a schematic cut-away view of a second locking switch mechanism in accordance with the present invention with the switch in an unlocked condition;
  • Figure 16 illustrates the mechanism of Figure 15 after the insertion of an actuator and locking of the mechanism; and
  • Figure 17 is a perspective view of a locking fork incorporated in the mechanism of Figures 15 and 16.

Referring to Figure 1, the illustrated lockable switch mechanism comprises a housing 1 in which a plunger 2 is slidable and which supports a head assembly 3 supporting a rotatable cam 4, the cam 4 being rotatable about a pin 5. The plunger 2 comprises a metal core supporting an outer casing 6 which is slidably received in a sealing cap 7. The plunger 2 is symmetrical about its longitudinal axis and is slidable relative to the housing 1 along that axis.

The end of the plunger 2 remote from the cam 4 is received in a bore 8, a compression spring 9 being located within the bore 8 so as to bias the plunger 2 in the direction indicated by arrow 10. The bore 8 is formed in the end of a solenoid plunger 11 which is received within a solenoid housing 12. Energisation of a solenoid winding (not shown) in the solenoid housing 12 drives the solenoid plunger 11 to the right in Figure 1. Denergisation of the solenoid results in the solenoid plunger 11 being moved to the left in Figure 1 by a compression spring 13 (Figure 2) which is located between the solenoid housing 12 and a locking fork 14 which is engaged in a groove extending around the end of the solenoid plunger 11 in which the bore 8 is formed.

Two locking pins 15 are positioned on either side of the plunger 2, the locking pins 15 being biased by springs 16 against the plunger 2. The locking pins 15 and springs 16 are retained within a housing assembly made up from a frame 17 and a cover plate 18. It will be seen that with the plunger 2 in the position shown in Figure 1 the pins 15 are held at a distance from the axis of the plunger 2 such that they obstruct the passage of arms 19 supported by the locking fork 14 in the direction of the arrow 10.

Figure 2 shows the assembly of Figure 1 after the insertion of an actuator 20 into the head assembly 3 so as to cause rotation of the cam 4. Such rotation of the cam 4 enables the plunger 2 to move towards the pin 5. As a result a profile 21 in the form of an annular shoulder on the plunger 2 is moved to the left of the locking pins 15. The locking pins 15 are biased towards each other so as to remain in contact with the plunger 2, thereby enabling the arms 19 of the locking fork 14 to pass the locking pins 15.

The actuator 20 and cam 4 are shaped such that insertion of the actuator into the head assembly 3 causes the cam to rotate from a datum position, that is the position of the cam 4 as shown in Figure 1. In known manner, the actuator defines projections (not shown) which engage in recesses defined by the cam 4 (as shown in Figure 2) so that once the cam 4 has been rotated from the datum position the actuator 20 cannot be withdrawn from the head assembly 3 unless the cam 4 has been rotated back to the datum position. An actuator and cam mechanism of this general type is described in the abovementioned US Patent No. 5,777,284 .

Figures 3 and 4 show the assembly in the unlocked condition. In Figure 3, the solenoid plunger 11 has been moved to the position it assumes when the solenoid is energised and the plunger 2 is in the position in which it is displaced by the cam 4 as far as possible towards the solenoid housing 12. As a result the spacing between the pins 15 is such that even if the solenoid is then deenergised the arms 19 cannot move past the pins 15. The pins 15 therefore impose no restraint on the axial displacement of the plunger 2. In contrast, as shown in Figures 5 and 6, if the cam 4 is then rotated to displace the plunger 2 so that the pins 15 can drop down the profiled shoulder 21 defined by the plunger 2, the springs 16 urge the locking pins 15 towards each other so as to engage behind the shoulder 21. Deenergisation of the solenoid then results in the arms 19 being extended past the pins 15, restraining the pins 15 against movement away from each other. Any attempt therefore to drive the plunger 2 towards the solenoid housing 12 will be resisted as a result of the pins 15 jamming between the profile 21 and the arms 19.

Figure 7 shows the assembly after displacement of the plunger 2 towards the cam pin 5. Unless the solenoid is energised, the arms 19 of the locking fork 14 will engage around the pins 15 as shown in Figures 5 and 6. In the configuration shown in Figure 7 however the solenoid has been energised, displacing the arms 19 to the right. There is then nothing to stop the locking pins 15 being moved apart against the biasing force provided by the springs 16. Thus if the actuator 20 was to be withdrawn from the head assembly 3 this would result in the displacement of the plunger 2 to the right in Figure 7, such movement being permitted as the tapered surface of the shoulder 21 would push against and force apart the two locking pins 15.

Referring to Figure 8, this shows the assembly if an attempt is made to withdraw the actuator 21 when the assembly is in the configuration shown in Figure 2, that is with the pins 15 locked in position by the arms 19. Pulling on the actuator 21 causes the cam 4 to rotate in the clockwise direction in Figure 8, thereby applying an axial force to the plunger 2 and causing the plunger to move in the direction indicated by arrow 22. Such displacement is however resisted by the locking pins 15 which bear against the profile 21. The arms 19 prevent the pins 15 moving apart and thus further axial displacement of the plunger 2 is prevented.

In contrast, if the solenoid is energised so as to displace the arms 19 to the position shown in Figure 7, and the actuator 20 is pulled out of the head assembly 3, rotation of the cam 4 is not resisted by contact between the pins 15 and the profile 21 and as a result the plunger 2 can be displaced in the direction of arrow 23 as shown in Figure 9.

Figure 10 illustrates the housing assembly for the locking pins 15 and springs 16 and Figure 11 shows the components of the assembly of Figure 10 in exploded form.

Figure 12 is a sectional view through the solenoid plunger 11 showing the bore 8 and the groove extending around the end of the plunger 11 in which the bore 8 is provided, that groove being engaged by the locking fork 14 shown in Figures 13 and 14.

Referring to Figures 13 and 14, the locking fork which supports the locking arms 19 has a C-shaped body defining an inwardly projecting edge 24, that edge being received in the slot formed around the end of the solenoid plunger 11 shown in Figure 12. The inner faces of the fork arms 19 are tapered such that, on energisation of the solenoid, the arms 19 are released easily from engagement with the pins 15.

Given the structure of the plunger and locking fork combination, it is a relatively easy matter to assembly the combination. In an alternative arrangement it would of course be possible to fabricate the plunger 11 and the locking fork 14 including the locking fork arms 19 as a single piece component.

In the embodiment of Figures 1 to 14, energisation of the solenoid is necessary to release the locking mechanism. The solenoid is not energised accept when it is desired to release the locking mechanism. In the event of a power failure when the mechanism is locked, it is not possible to unlock the mechanism and therefore it is not possible to release the actuator from the cam. The actuator can only be released after the supply of power is restored. In some applications, this can be a significant disadvantage. Figures 15 to 17 illustrate a second embodiment of the invention in which this disadvantage is avoided by relying upon a solenoid which is energised when the switch is locked and de-energised when the switch locking mechanism is released.

Referring to Figures 15 to 17, components of the second embodiment which are equivalent to components of the first embodiment shown in Figures 1 to 14 are identified by the same reference numerals. Thus, in the second embodiment a plunger 2 is biased against a cam 4 by a compression spring 9. The plunger 2 is located between a pair of locking pins 15 which are biased against the sides of the plunger 2 by springs 16. The plunger 2 defines a shoulder 21 behind which the locking pins 15 engage when the plunger 2 is displaced towards a pin 5 about which the cam rotates. Figure 15 shows the locking mechanism before insertion of an actuator into the assembly so as to rotate the cam. In this configuration the locking pins 15 cannot engage behind the shoulder 21. Figure 16 shows the mechanism after displacement of the plunger 2 as a result of rotation of the cam 4. In this configuration the pins 15 are biased inwards by the springs 16 so as to engage behind the shoulder 21. Figure 16 shows the locking pins 15 after displacement of a locking fork 14 so that locking arms 19 extend outside the locking pins 15, thereby preventing the locking pins 15 from moving outwards. In the condition shown in Figure 16, the plunger 2 cannot therefore be moved to the right in Figure 16 as such movement would be prevented by interengagement between the shoulder 21 and the locking pins 15.

The locking fork 14 is mounted on solenoid plunger 11 and is biased towards the cam 4 by a compression spring 13. If the solenoid is de-energised, the spring 13 ensures that the locking arms 19 are displaced away from the locking pins 15. The mechanism is therefore unlocked in that axial movement of the plunger 2 is not obstructed. If the solenoid is energised, the plunger 11 is driven to the right in Figure 16 such that, providing the plunger 2 is in the position shown in Figure 16, the locking arms 19 can engage outside the locking pins 15, thereby locking the mechanism.

With the arrangement illustrated in Figures 15 and 16, the switch will remain locked only so long as the solenoid is energised. When it is desired to unlock the mechanism, the solenoid is simply de-energised. With such an arrangement it will be appreciated that, in the event of a power failure, the mechanism is automatically unlocked. In some applications this is a significant advantage. In contrast, with the mechanism illustrated in Figures 1 to 14, unlocking of the mechanism requires energisation of the solenoid and therefore in the event of a power failure it would not be possible to release the actuator 20 from the cam 4.

Figure 17 illustrates the structure of the locking fork 14 of the embodiment of Figures 15 and 16 in greater detail. It will be noted that the locking arms 19 are mounted on an L-shaped extension 25 of the locking fork 14, the locking fork 14 defining a C-shaped body defining an inwardly projecting edge that is received in a slot formed around the end of the solenoid plunger 11.


Anspruch[de]
Verriegelbarer Schahmechanismus, der Folgendes umfasst: einen Schaltstößel (2), der in einem Gehäuse (1) montiert und relativ zu dem Gehäuse entlang einer vorbestimmten Achse zwischen einer ersten entriegelten Position und einer zweiten Position verschieblich ist, einen Verriegelungsmechanismus für den Schaltstößel in der zweiten Position und einen Schalmechanismus, der durch Bewegungen des SchaltstöBels zwischen der ersten und der zweiten Position betätigt werden kann, wobei der Verriegelungsmechanismus wenigstens ein erstes Verriegelungselement (15), das gegen eine Oberfläche des Schaltstößels vorgespannt ist, und wenigstens ein zweites Verriegelungselement (19) umfasst, das zwischen der verriegelten und der entriegelten Position verschieblich ist, wobei die Oberfläche des Sehaltstößels, gegen die das erste Verriegelungselement vorgespannt ist, ein Profil (21) definiert, das so angeordnet ist, dass eine Bewegung des Schaltstößels von der zweiten in die erste Position bewirkt, dass das Profil das erste Verriegelungselement verschiebt, und das zweite Verriegelungselement, wenn es in der verriegelten Position ist, eine Verschiebung des ersten Verriegelungselementes durch das Profil verhindert, um dadurch eine Bewegung des Stößels von der zweiten in die erste Position zu verhindern, dadurch gekennzeichnet, dass der Schaltstößel (2) gegen eine Nocke (4) vorgespannt ist, die von einer Bezugsposition durch Einfügen eines Aktuators (20) in den Mechanismus drehbar ist und in den Aktuator eingreift, um dessen Beseitigung zu verhindern, wenn die Nocke nicht in die Bezugsposition gedreht ist, wobei der Verriegelungsmechanismus die Aufgabe hat, eine Beseitigung des Aktuators zu verhindern, wenn der Schaltstößel von der Nocke in die zweite Position verschoben wurde und das zweite verriegelungselement in die verriegelte Position verschoben wurde. Mechanismus nach Anspruch 1, wobei das oder jedes erste Verriegelungselement einen Verriegelungsbolzen (15) aufweist, der transversal relativ zur verschiebungsachse des Schaltslößels verläuft, wobei der Verriegelungsbolzen in einer Richtung lotrecht zu der Achse zu dem Schaltstößel hin federnd vorgespannt ist. Mechanismus nach Anspruch 2, der zwei Verriegelungsbolzen (15) umfasst, die sich auf gegenüberliegenden Seiten des Schaltstößels (2) befinden. Mechanismus nach Anspruch 3, wobei die beiden Verriegelungsbolzen (15) in einer Gehäusebaugruppe montiert sind, die eine Öffnung definiert, durch die der Schaltstößel verlauft, wobei die Verriegelungsbolzen von gegenüberliegenden Seiten der Öffnung aus durch in der Gehäusebaugruppe gelagerte Federn zueinander bin federnd vorgespannt werden. Mechanismus nach Anspruch 3, wobei die Gehäusebaugruppe einen Rahmen (17), der die Verriegelungsbolzen (15) und Federn (16) aufnimmt, sowie eine Abdeckplatte (18) umfasst, die die Verriegelungsbolzen und Federn in der Baugruppe hält. Mechanismus nach einem der Ansprüche 2 bis 5, wobei das Profil (21) durch eine ringförmige Schulter definiert wird, die um den Schaltstößel herum verläuft. Mechanismus nach einem der vorherigen Ansprüche, wobei das oder jedes Verriegelungselement (20) einen Verriegelungsarm (19) umfasst, der in einer Richtung parallel zur Achse des Schaltstößels (2) verschieblich ist und, wenn er in der verriegelten position ist, auf der Seite des ersten Verriegelungselementes (19) fern von dem Schaltstößel (2) verläuft, um eine Verschiebung des ersten Verriegelungselementes (19) in einer Richtung von der Achse des Schaltstößels (2) weg zu verhindern. Mechanismus nach Anspruch 7, wobei der oder jeder Verriegelungsarm (19) eine konische Fläche definiert, die in der verriegelten Position mit dem oder einem jeweiligen ersten Verriegelungselement Kontakt erhält, wobei die Regelung die Aufgabe hat, ein Lösen des Verriegelungsarms zu erleichtern, wenn der Verriegelungsarm in die gelöste Position verschoben wird. Mechanismus nach Anspruch 7 oder Anspruch 8 in Abhängigkeit von Anspruch 3, wobei zwei Verriegelungsarme (19) zum Verriegeln jeweiliger Verriegelungsbolzen (15) gegen eine Verschiebung relativ zu dem Schaltstößel vorgesehen sind. Mechanismus nach Anspruch 9, wobei die Verriegelungsarme von einem Ende eines Magnetventilstößels (11) verlaufen, der an einem Ende des Schaltstößels (2) angeordnet und durch eine Magnetventilwicklung mit einem Magnetventilgehäuse entlang der Schaltstößelachse verschieblich ist. Mechanismus nach Anspruch 10, wobei eine Druckfeder (13) zwischen dem Schalt- und dem Magnetventilstößel angeordnet ist, um die Stößel auseinander vorzuspannen. Mechanismus nach Anspruch 10 oder 11, wobei eine Druckfeder zwischen dem Magnetventilstößel und dem Magnetventilgehäuse angeordnet ist, um den Magnetventilstößel zu dem Schaltstößel hin vorzuspannen. Mechanismus nach Anspruch 1, wobei das wenigstens eine Verriegelungselement (15) direkt gegen die Oberfläche des Schaltstößels vorgespannt wird.
Anspruch[en]
A lockable switch mechanism comprising a switch plunger (2) which is mounted in a housing (1) and is displaceable relative to the housing along a predetermined axis between a first unlocked position and a second position, a locking mechanism for the switch plunger in the second position, and a switch mechanism which is actuated by movements of the switch plunger between the first and second positions, wherein the locking mechanism comprises at least one first locking member (15) which is biased against a surface of the switch plunger and at least one second locking member (19) which is displaceable between locked and released positions, the surface of the switch plunger against which the first locking member is biased defining a profile (21) arranged such that movement of the switch plunger from the second to the first position causes the profile to displace the first locking member, and the second locking member when in the locked position preventing displacement of the first locking member by the profile to thereby prevent movement of the plunger from the second to the first position, characterised in that the switch plunger (1) is biased against a cam (4) that is rotatable from a datum position by insertion of an actuator (20) into the mechanism and which engages the actuator to prevent its removal unless the cam is rotated to the datum position, the locking mechanism being arranged to prevent removal of the actuator if the switch plunger has been displaced by the cam to the second position and the second locking member has been displaced to the locked position. A mechanism according to claim 1, wherein the or each first locking member comprises a locking pin (15) extending transversely relative to the axis of displacement of the switch plunger, the locking pin being spring biased towards the switch plunger in a direction perpendicular to the axis. A mechanism according to claim 2, comprising two locking pins (15) located on opposite sides of the switch plunger (2). A mechanism according to claim 3, wherein the two locking pins (15) are mounted in a housing assembly defining an aperture through which the switch plunger extends, the locking pins being spring-biased towards each other from opposite sides of the aperture by springs supported in the housing assembly. A mechanism according to claim 3, wherein the housing assembly comprises a frame (17) which receives the locking pins (15) and springs(16) and a cover plate (18) which retains the locking pins and springs within the assembly. A mechanism according to any one of claims 2 to 5, wherein the profile (21) is defined by an annular shoulder extending around the switch plunger. A mechanism according to any preceding claim, wherein the or each locking member (20) comprises a locking arm (19) which is displaceable in a direction parallel to the switch plunger (2) axis and, when in the locked position, extends on the side of the first locking member (19) remote from the switch plunger (2) to prevent displacement of the first locking member (19) in a direction away from the switch plunger (2) axis. A mechanism according to claim 7, wherein the or each locking arm (19) defines a tapered surface that contacts the or a respective first locking member when in the locked position, the taper being arranged to facilitate release of the locking arm when the locking arm is displaced to the released position. A mechanism according to claim 7 or claim. 8 as dependant upon claim 3, wherein two locking arms (19) are provided to lock respective locking pins (15) against displacement relative to the switch plunger. A mechanism according to claim 9, wherein the locking arms extend from one end of a solenoid plunger (11) which is arranged at one end of the switch plunger (1) and is displaceable along the switch plunger axis by a solenoid winding with a solenoid housing. A mechanism according to claim 10, wherein a compression spring (13) is arranged between the switch and solenoid plungers to bias the plungers apart. A mechanism according to claim 10 or 11, wherein a compression spring is arranged between the solenoid plunger and the solenoid housing to bias the solenoid plunger towards the switch plunger. A mechanism according to claim 1, wherein the at least one first locking member (15) is directly biased against the surface of the switch plunger.
Anspruch[fr]
Mécanisme de commutation verrouillable comprenant un plongeur de commutateur (2) qui est monté dans un boîtier (1) et peut être déplacé par rapport au boîtier le long d'un axe prédéterminé entre une première position non verrouillée et une seconde position, un mécanisme de verrouillage pour le plongeur de commutateur dans la seconde position, et un mécanisme de commutation qui est activé par des mouvements du plongeur de commutateur entre les première et seconde positions, dans lequel le mécanisme de verrouillage comprend au moins un premier élément de verrouillage (15) qui est sollicité contre la surface du plongeur de commutateur et au moins un second élément de verrouillage (19) qui peut être déplacé entre les positions verrouillée et déverrouillée, la surface du plongeur de commutateur contre laquelle le premier élément de verrouillage est sollicite définissant un profil (21) disposé de telle façon que le mouvement du plongeur de commutateur depuis la seconde vers la première position provoque le déplacement du premier élément de verrouillage par le profil, le second élément de verrouillage, quand il se trouve dans la position verrouillée, empêchant que le profil ne déplace le premier élément de verrouillage pour empêcher par ce moyen le mouvement du plongeur depuis la seconde vers la première position, caractérisé en ce que le plongeur de commutateur (2) est sollicité contre une came (4) qui peut tourner depuis une position de référence par l'insertion d'un actionneur (20) dans le mécanisme et qui engage l'actionneur pour empêcher son retrait à moins que la came ne soit tournée jusqu'à la position de référence, le mécanisme de verrouillage étant disposé pour Empêcher le retrait de l'actionneur si le plongeur de commutateur a été déplacé par la came jusqu'à la seconde position et que le second élément de verrouillage a été déplacé jusqu'à la position verrouillée. Mécanisme selon la revendication 1, dans lequel le ou chaque premier élément de verrouillage comprend une goupille de verrouillage (15) s'étendant de manière transversale par rapport à l'axe de déplacement du plongeur de commutateur, la goupille de verrouillage étant sollicitée par un ressort vers le plongeur de commutateur dans une direction perpendiculaire à l'axe. Mécanisme selon la revendication 2, comprenant deux goupilles de verrouillage (15) localisées sur des côtés opposés du plongeur de commutateur (2). Mécanisme selon la revendication 3, dans lequel les deux goupilles de verrouillage (15) sont montées dans un assemblage de boîtier définissant une ouverture à travers laquelle le plongeur de commutateur s'étend, les goupilles de verrouillage étant sollicitée (par un ressort) l'une vers l'autre depuis des côtés opposés de l'ouverture par des ressorts supportés dans l'assemblage de bottier. Mécanisme selon la revendication 3, dans lequel l'assemblage de boîtier comprend un cadre (17) qui reçoit les goupilles de verrouillage (15) et les ressorts (16) et une plaque de couverture (18) qui retient les goupilles de verrouillage et les ressorts à l'intérieur de l'assemblage de boîtier. Mécanisme selon l'une quelconque des revendications 2 à 5, dans lequel le profil (21) est défini par un épaulement annulaire s'étendant autour du plongeur de commutateur. Mécanisme selon l'une quelconque des revendications précédentes, dans lequel le ou chaque élément de verrouillage (20) comprend un bras de verrouillage (19) qui peut se déplacer dans une direction parallèle à l'axe du plongeur de commutateur (2) et qui, quand il se trouve dans la position verrouillée, s'étend sur le côté du premier élément de verrouillage (19) loin du plongeur de commutateur (2) pour empêcher le déplacement du premier élément de verrouillage (19) dans une direction s'écartant de l'axe du plongeur de commutateur (2). Mécanisme selon la revendication 7, dans lequel le ou chaque bras de verrouillage (19) définit une surface conique qui entre en contact avec le ou un premier élément de verrouillage respectif quand il se trouve dans la position verrouillée, l'inclinaison étant disposée pour faciliter la libération du bras de verrouillage quand le bras de verrouillage est déplacé jusqu'à la position déverrouillée. Mécanisme selon la revendication 7 ou 8 du moment qu'elle dépend de la revendication 3, dans lequel deux bras de verrouillage (19) sont fournis pour verrouiller les goupilles de verrou respectives (15) contre le déplacement par rapport au plongeur de commutateur. Mécanisme selon la revendication 9, dans lequel les bras de verrouillage s'étendent depuis une extrémité d'un plongeur de solénoïde (11) qui est disposé à une extrémité du plongeur de commutateur (2) et peut se déplacer le long de l'axe du plongeur de commutateur par l'enroulement d'un solénoïde avec un boîtier de solénoïde. Mécanisme selon la revendication 10, dans lequel un ressort de compression (13) est disposé entre les plongeurs de commutateur et de solénoïde pour écarter les plongeurs l'un de l'autre. Mécanisme selon la revendication 10 ou 11, dans lequel un ressort de compression est disposé entre le plongeur de solénoïde et le boîtier de solénoïde pour solliciter le plongeur de solénoïde vers le plongeur de commutateur. Mécanisme selon la revendication 1, dans lequel le au moins un premier élément de verrouillage (15) est sollicité directement contre la surface du plongeur de commutateur.






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