EP0817227B1 - Safety switch that may be locked with an electromagnet - Google Patents
Safety switch that may be locked with an electromagnet Download PDFInfo
- Publication number
- EP0817227B1 EP0817227B1 EP97401340A EP97401340A EP0817227B1 EP 0817227 B1 EP0817227 B1 EP 0817227B1 EP 97401340 A EP97401340 A EP 97401340A EP 97401340 A EP97401340 A EP 97401340A EP 0817227 B1 EP0817227 B1 EP 0817227B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electromagnet
- axis
- housing
- safety switch
- push rod
- 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.)
- Expired - Lifetime
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Classifications
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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
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/0006—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches
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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
- H01H2027/005—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 key receiving part having multiple openings to allow keys from different directions to operate the switch
Definitions
- the present invention relates to a safety switch of the type comprising on the one hand a housing in which is housed a block of electrical contacts, and on the other hand a control head fixed to the housing so as to assume several differentiated positions by rotation around 'a first axis; in such a switch, the control head has on the one hand at least one insertion slot for an actuator and on the other hand a transmission mechanism provided with a roller that can be engaged by the actuator and capable of rotation around a second axis, perpendicular to the first axis, and a pusher intended to act on the contact block and movable parallel to the first axis under the effect of the mechanism in response to the movement of the actuator.
- An electromagnet is sometimes added to such a switch, the function of which is to block the transmission mechanism, and thereby the actuator which remains attached to this mechanism, to enable the locking of the actuator to be controlled remotely and therefore the 'organ - door or machine organ - that we want to keep in the safety position.
- switches see for example EP-553 885 and WO 95/18 457
- the locking device interposed between the electromagnet and the transmission mechanism as simple as possible, more particularly so as to be able to associate it with a minimum of modification both with an electromagnet with locking under voltage and with a power off locking electromagnet.
- the locking device must also be designed to absorb without damage significant forces from the actuator and to interfere as little as possible with the kinematic chain of transmission to the contact block.
- the core of the electromagnet cooperates with the blocking member by a locking device capable of being placed in two positions allowing the blocking of the pusher when the electromagnet is energized and respectively de-energized.
- the locking member is preferably a locking slide guided in rectilinear slides of the housing perpendicular to the first axis and cooperating with the core of the electromagnet by a coupling with reversible actuating ramp, for example a piece with retoumable guide ramp.
- the locking slide advantageously cooperates with a blocking surface provided on a metal sheath fitted on the tail of a pusher linked to the roller of the transmission mechanism.
- FIG. 1 shows in elevation and in section a safety switch in accordance with the invention, configured as a voltage-locked switch, in the unlocked position.
- Figure 2 is section 2-2 of Figure 1.
- Figure 3 is a partial view of the safety switch of Figure 1, in the locked position.
- Figure 4 is section 4-4 of Figure 3.
- FIG. 5 shows the safety switch configured as a lock switch with the power off, in the unlocked position.
- the safety switch shown in the figures comprises a housing 10 in which are housed an electrical contact block B and an electromagnet E.
- the housing is closed by a cover not indicated.
- a control head 11 is fixed to the housing so as to be able to take four different positions by successive rotations of 90 ° around an axis X1.
- the head 11 comprises a lateral slot 12 and an upper slot 13 in one or the other of which an actuator A of special shape can be introduced in order to actuate the contacts of the block B.
- an actuator is for example attached to an envelope door or a machine member whose security requires closing or coming into a certain position, the contact block noting the security position and translating it for example into an operating authorization. According to the case; it may be advantageous to engage the actuator A in the slot 12 or in the slot 13.
- the control head 11 houses a transmission mechanism 14 provided with a roller rotating around an axis X2 perpendicular to X1 and with a follower plunger 15; this mechanism is of any known type and is suitable, in particular by means of the form particular of the actuator and one or two locking rollers 14a of the rotating roller 14, which can be urged on by the actuator, to prevent any violation of the implementation of the contacts.
- the follower plunger 15 made of plastic protrudes from the head towards the inside of the housing, this pusher being linked to a follower head 19 which comprises a ramp 19a guiding a pin or pin of the roller to translate the rotation movement of the roller in a translational movement of the pusher 15; it acts directly on a control member 16 which is specific to the contact block B and which carries the contacts thereof.
- a metal sheath 17 which does not participate in the transmission of movement to the contact block and which is intended to block the follower head of the mechanism 14 when the order is transmitted to the coil of the electromagnet, while relieving the pusher of blocking efforts.
- the sheath can be gently slid onto the pusher while remaining free to move relative to it or can be held on the pusher by means of retaining, latching, and it is in abutment at less in the locking phase on a shoulder 19b of the follower head to block the latter; it can be biased by an independent return spring, but, more simply, by the connection of the follower head with the roller, a return spring associated with the latter suffices to return the assembly to the rest position.
- the sheath 17 has a length less than that of the pusher and has a bearing surface 18 for a locking member, as described below, this surface being located at its lower free end or defined by a groove.
- the electromagnet E comprises a movable core 20 movable in a direction X3 parallel to X1 and biased by a return spring F, the core being fixed to a support 21 for driving a slide 22; the support is movable in the housing 10 in the direction X3 and it is guided for this purpose in slides 23 of the housing, while the slider is mobile in the housing in a direction X4 perpendicular to X1, X3 and is guided in slides rectilinear 24 of the housing.
- a retoumable coupling piece 25 is engaged in a removable manner, for example latched or fitted, in a grooved recess 21a of the support 21; the part 25 has a ramp 26 cooperating with a follower finger 27 provided at the end 22a of the slider 22 opposite that 22b which cooperates with the bearing surface 18 of the sheath 17. At its end 22b, the slider 22 has a fork 28 making it possible to block the sheath 17 without intervening on the pusher 15 (see Figure 4).
- the retoumable coupling provided between the electromagnet E and the pusher 15 can be arranged differently; in particular, the ramp may belong to the end of the slide and be driven by a finger of the support 21.
- the support can be biased by a return spring shown schematically in the figures,
- the actuator A is released from the control head 11 so that the mechanism 14 is put in the rest state under the effect of a return spring not indicated and locked in this state by a member lock not shown.
- the plunger 15 and the metal sheath 17 are held in the low position by the connection of the follower head 19 with the rotating roller and the connection of the sheath with the roller or the plunger.
- the member 16 of the contact block B is therefore kept in the low position and the block B is in the working position.
- the electromagnet E is de-energized, so that the support 21 is put in the high position by the spring, which pulls the slider 22 to the left since the finger 27 is housed towards the end of the left part 26a, for example vertical, from the ramp 26.
- the sheath is therefore free, and with it the head 19 and the pusher 15, to move if the mechanism 14 is switched.
- the spring F is a safety element which, upon interruption of the supply of the coil of the electromagnet, returns the switch to its initial position of rest (locked position for a electro magnet with the power on or unlocked position for a power off solenoid).
Description
La présente invention concerne un interrupteur de sécurité du type comprenant d'une part un boîtier dans lequel est logé un bloc de contacts électriques, et d'autre part une tête de commande fixée au boîtier de manière à prendre plusieurs positions différenciées par rotation autour d'un premier axe ; dans un tel interrupteur, la tête de commande présente d'une part au moins une fente d'introduction pour un actionneur et d'autre part un mécanisme de transmission muni d'un galet engageable par l'actionneur et susceptible de rotation autour d'un deuxième axe, perpendiculaire au premier axe, et d'un poussoir destiné à agir sur le bloc de contacts et mobile parallèlement au premier axe sous l'effet du mécanisme en réponse au déplacement de l'actionneur.The present invention relates to a safety switch of the type comprising on the one hand a housing in which is housed a block of electrical contacts, and on the other hand a control head fixed to the housing so as to assume several differentiated positions by rotation around 'a first axis; in such a switch, the control head has on the one hand at least one insertion slot for an actuator and on the other hand a transmission mechanism provided with a roller that can be engaged by the actuator and capable of rotation around a second axis, perpendicular to the first axis, and a pusher intended to act on the contact block and movable parallel to the first axis under the effect of the mechanism in response to the movement of the actuator.
Il est parfois adjoint à un tel interrupteur un électroaimant dont la fonction consiste à bloquer le mécanisme de transmission, et par là même l'actionneur resté accroché à ce mécanisme, pour permettre de commander à distance le verrouillage de l'actionneur et donc de l'organe - porte ou organe de machine - que l'on veut maintenir en position de sécurité. Dans de tels interrupteurs connus ( voir par exemple EP- 553 885 et WO 95/18 457 ), il est courant de disposer l'électroaimant avec son noyau mobile parallèlement à l'axe de déplacement du poussoir du bloc de contacts. Il est également connu ( voir FR-2 569 303 ) de disposer l'électroaimant transversalement pour bloquer un organe intermédiaire transmettant le mouvement d'un coulisseau du mécanisme de transmission au poussoir du bloc de contacts ; cet organe intermédiaire implique des risques de coincement supplémentaires.An electromagnet is sometimes added to such a switch, the function of which is to block the transmission mechanism, and thereby the actuator which remains attached to this mechanism, to enable the locking of the actuator to be controlled remotely and therefore the 'organ - door or machine organ - that we want to keep in the safety position. In such known switches (see for example EP-553 885 and WO 95/18 457), it is common to have the electromagnet with its movable core parallel to the axis of movement of the push-button of the contact block. It is also known (see FR-2,569,303) to arrange the electromagnet transversely to block an intermediate member transmitting the movement of a slide of the transmission mechanism to the push button of the contact block; this intermediate member involves additional risks of jamming.
Il est souhaitable de réaliser de manière aussi simple que possible le dispositif de verrouillage interposé entre l'électroaimant et le mécanisme de transmission, plus particulièrement pour pouvoir l'associer avec un minimum de modification aussi bien à un électroaimant à verrouillage sous tension qu'à un électroaimant à verrouillage hors tension. Le dispositif de verrouillage doit de plus être conçu pour absorber sans dommage des efforts importants provenant de l'actionneur et pour interférer aussi peu que possible avec la chaîne cinématique de transmission au bloc de contacts.It is desirable to make the locking device interposed between the electromagnet and the transmission mechanism as simple as possible, more particularly so as to be able to associate it with a minimum of modification both with an electromagnet with locking under voltage and with a power off locking electromagnet. The locking device must also be designed to absorb without damage significant forces from the actuator and to interfere as little as possible with the kinematic chain of transmission to the contact block.
Selon l'invention, le noyau de l'électroaimant coopère avec l'organe de blocage par un dispositif de verrouillage suceptible d'être placé dans deux positions permettant le blocage du poussoir quand l'électroaimant est sous tension et respectivement hors tension.According to the invention, the core of the electromagnet cooperates with the blocking member by a locking device capable of being placed in two positions allowing the blocking of the pusher when the electromagnet is energized and respectively de-energized.
L'organe de blocage est de préférence un coulisseau de verrouillage guidé dans des glissières rectilignes du boîtier perpendiculairement au premier axe et coopérant avec le noyau de l'électroaimant par un attelage à rampe d'actionnement réversible, par exemple une pièce à rampe de guidage retoumable.The locking member is preferably a locking slide guided in rectilinear slides of the housing perpendicular to the first axis and cooperating with the core of the electromagnet by a coupling with reversible actuating ramp, for example a piece with retoumable guide ramp.
Le coulisseau de verrouillage coopère avantageusement avec une portée de blocage prévue sur un fourreau métallique emmanché sur la queue d'un poussoir lié au galet du mécanisme de transmission.The locking slide advantageously cooperates with a blocking surface provided on a metal sheath fitted on the tail of a pusher linked to the roller of the transmission mechanism.
La description qui va être faite d'un mode de réalisation de l'invention, en regard des dessins annexés, explicite les avantages et résultats obtenus.The description which will be given of an embodiment of the invention, with reference to the appended drawings, explains the advantages and results obtained.
La figure 1 représente en élévation et en coupe un interrupteur de sécurité conforme à l'invention, configuré en interrupteur à verrouillage sous tension, en position déverrouillée.FIG. 1 shows in elevation and in section a safety switch in accordance with the invention, configured as a voltage-locked switch, in the unlocked position.
La figure 2 est la coupe 2-2 de la figure 1.Figure 2 is section 2-2 of Figure 1.
La figure 3 est une vue partielle de l'interrupteur de sécurité de la figure 1, en position verrouillée.Figure 3 is a partial view of the safety switch of Figure 1, in the locked position.
La figure 4 est la coupe 4-4 de la figure 3.Figure 4 is section 4-4 of Figure 3.
La figure 5 montre l'interrupteur de sécurité configuré en interrupteur à verrouillage hors tension, en position déverrouillée.FIG. 5 shows the safety switch configured as a lock switch with the power off, in the unlocked position.
L' interrupteur de sécurité représenté sur les figures comprend un boîtier 10 dans lequel sont logés un bloc de contacts électriques B et un électroaimant E. Le boîtier est fermé par un couvercle non indiqué. Une tête de commande 11 est fixée au boîtier de manière à pouvoir prendre quatre positions différentes par rotations successives de 90° autour d'un axe X1. La tête 11 comprend une fente latérale 12 et une fente supérieure 13 dans l'une ou l'autre desquelles on peut introduire un actionneur A de forme spéciale en vue d'actionner les contacts du bloc B. Comme on le sait, un tel actionneur est par exemple rattaché à une porte d'enveloppe ou un organe de machine dont la sécurité impose la fermeture ou la venue dans une certaine position, le bloc de contacts constatant la position de sécurité et la traduisant par exemple en une autorisation de fonctionnement. Selon les cas; il peut être avantageux d'engager l'actionneur A dans la fente 12 ou dans la fente 13.The safety switch shown in the figures comprises a housing 10 in which are housed an electrical contact block B and an electromagnet E. The housing is closed by a cover not indicated. A control head 11 is fixed to the housing so as to be able to take four different positions by successive rotations of 90 ° around an axis X1. The head 11 comprises a lateral slot 12 and an upper slot 13 in one or the other of which an actuator A of special shape can be introduced in order to actuate the contacts of the block B. As is known, such an actuator is for example attached to an envelope door or a machine member whose security requires closing or coming into a certain position, the contact block noting the security position and translating it for example into an operating authorization. According to the case; it may be advantageous to engage the actuator A in the slot 12 or in the slot 13.
La tête de commande 11 loge un mécanisme de transmission 14 muni d'un galet tournant autour d'un axe X2 perpendiculaire à X1 et d'un poussoir suiveur 15; ce mécanisme est de tout type connu et il est apte, notamment au moyen de la forme particulière de l'actionneur et d'un ou deux galets de blocage 14a du galet tournant 14, sollicitables par l'actionneur, à interdire toute violation de la mise en oeuvre des contacts. Le poussoir suiveur 15 en matière plastique est en saillie hors de la tête vers l'intérieur du boîtier, ce poussoir étant lié à une tête suiveuse 19 qui comprend une rampe 19a guidant un pion ou axe du galet pour traduire le mouvement de rotation du galet en un mouvement de translation du poussoir 15 ; celui-ci agit directement sur un organe de commande 16 qui est propre au bloc de contacts B et qui porte les contacts de celui-ci. Sur le poussoir 15 est emmanché un fourreau métallique 17 qui ne participe pas à la transmission de mouvement au bloc de contacts et qui est destiné à bloquer la tête suiveuse du mécanisme 14 quand l'ordre en est transmis à la bobine de l'électroaimant, tout en soulageant le poussoir des efforts de blocage. Selon les cas, le fourreau peut être emmanché à coulissement doux sur le poussoir en restant libre de se déplacer par rapport à lui ou peut être maintenu sur le poussoir par des moyens de retenue, d'encliquetage,..et il est en butée au moins en phase de verrouillage sur un épaulement 19b de la tête suiveuse pour bloquer celle-ci; il peut être sollicité par un ressort de rappel indépendant, mais, de façon plus simple, par la liaison de la tête suiveuse avec le galet, un ressort de rappel associé à celui-ci suffit à rappeler l'ensemble en position de repos. Le fourreau 17 a une longueur inférieure à celle du poussoir et présente une portée d'appui 18 pour un organe de blocage, comme décrit plus loin, cette portée étant située à son extrémité libre inférieure ou définie par une rainure.The control head 11 houses a transmission mechanism 14 provided with a roller rotating around an axis X2 perpendicular to X1 and with a follower plunger 15; this mechanism is of any known type and is suitable, in particular by means of the form particular of the actuator and one or two locking rollers 14a of the rotating roller 14, which can be urged on by the actuator, to prevent any violation of the implementation of the contacts. The follower plunger 15 made of plastic protrudes from the head towards the inside of the housing, this pusher being linked to a follower head 19 which comprises a ramp 19a guiding a pin or pin of the roller to translate the rotation movement of the roller in a translational movement of the pusher 15; it acts directly on a control member 16 which is specific to the contact block B and which carries the contacts thereof. On the pusher 15 is fitted a metal sheath 17 which does not participate in the transmission of movement to the contact block and which is intended to block the follower head of the mechanism 14 when the order is transmitted to the coil of the electromagnet, while relieving the pusher of blocking efforts. Depending on the case, the sheath can be gently slid onto the pusher while remaining free to move relative to it or can be held on the pusher by means of retaining, latching, and it is in abutment at less in the locking phase on a shoulder 19b of the follower head to block the latter; it can be biased by an independent return spring, but, more simply, by the connection of the follower head with the roller, a return spring associated with the latter suffices to return the assembly to the rest position. The sheath 17 has a length less than that of the pusher and has a bearing surface 18 for a locking member, as described below, this surface being located at its lower free end or defined by a groove.
L'électroaimant E comporte un noyau mobile 20 mobile selon une direction X3 parallèle à X1 et sollicité par un ressort de rappel F, le noyau étant fixé à un support 21 d'entraînement d'un coulisseau 22 ; le support est mobile dans le boîtier 10 selon la direction X3 et il est guidé à cet effet dans des glissières 23 du boîtier, tandis que le coulisseau est mobile dans le boîtier selon une direction X4 perpendiculaire à X1,X3 et est guidé dans des glissières rectilignes 24 du boîtier. Une pièce d'attelage retoumable 25 est engagée de façon amovible, par exemple encliquetée ou emboîtée, dans un évidement rainuré 21a du support 21 ; la pièce 25 présente une rampe 26 coopérant avec un doigt suiveur 27 prévu à l'extrémité 22a du coulisseau 22 opposée à celle 22b qui coopère avec la portée 18 du fourreau 17. A son extrémité 22b, le coulisseau 22 présente une fourchette 28 permettant de bloquer le fourreau 17 sans intervenir sur le poussoir 15 (voir figure 4 ). Bien entendu, l'attelage retoumable prévu entre l'électroaimant E et le poussoir 15 peut être agencé différemment ; en particulier, la rampe peut appartenir à l'extrémité du coulisseau et être conduite par un doigt du support 21. Le support peut être sollicité par un ressort de rappel représenté de manière schématique sur les figures,The electromagnet E comprises a movable core 20 movable in a direction X3 parallel to X1 and biased by a return spring F, the core being fixed to a support 21 for driving a slide 22; the support is movable in the housing 10 in the direction X3 and it is guided for this purpose in slides 23 of the housing, while the slider is mobile in the housing in a direction X4 perpendicular to X1, X3 and is guided in slides rectilinear 24 of the housing. A retoumable coupling piece 25 is engaged in a removable manner, for example latched or fitted, in a grooved recess 21a of the support 21; the part 25 has a ramp 26 cooperating with a follower finger 27 provided at the end 22a of the slider 22 opposite that 22b which cooperates with the bearing surface 18 of the sheath 17. At its end 22b, the slider 22 has a fork 28 making it possible to block the sheath 17 without intervening on the pusher 15 (see Figure 4). Of course, the retoumable coupling provided between the electromagnet E and the pusher 15 can be arranged differently; in particular, the ramp may belong to the end of the slide and be driven by a finger of the support 21. The support can be biased by a return spring shown schematically in the figures,
Le fonctionnement de l'interrupteur de sécurité décrit va être expliqué en regard des figures 1 à 5.The operation of the safety switch described will be explained with reference to FIGS. 1 to 5.
Sur la figure 1, l'actionneur A est dégagé de la tête de commande 11 de sorte que le mécanisme 14 est mis à l'état repos sous l'effet d'un ressort de rappel non indiqué et bloqué dans cet état par un organe de verrouillage non représenté. Le poussoir 15 et le fourreau métallique 17 sont maintenus en position basse par la liaison de la tête suiveuse 19 avec le galet tournant et la liaison du fourreau avec le galet ou le poussoir. L'organe 16 du bloc de contacts B est donc maintenu en position basse et le bloc B est en position travail. L'électroaimant E est hors tension, de sorte que le support 21 est mis en position haute par le ressort, ce qui tire le coulisseau 22 vers la gauche puisque le doigt 27 est logé vers l'extrémité de la partie gauche 26a, par exemple verticale, de la rampe 26. Le fourreau est donc libre, et avec lui le tête 19 et le poussoir 15, de se déplacer si le mécanisme 14 est commuté.In FIG. 1, the actuator A is released from the control head 11 so that the mechanism 14 is put in the rest state under the effect of a return spring not indicated and locked in this state by a member lock not shown. The plunger 15 and the metal sheath 17 are held in the low position by the connection of the follower head 19 with the rotating roller and the connection of the sheath with the roller or the plunger. The member 16 of the contact block B is therefore kept in the low position and the block B is in the working position. The electromagnet E is de-energized, so that the support 21 is put in the high position by the spring, which pulls the slider 22 to the left since the finger 27 is housed towards the end of the left part 26a, for example vertical, from the ramp 26. The sheath is therefore free, and with it the head 19 and the pusher 15, to move if the mechanism 14 is switched.
Lorsque l'actionneur est engagé dans la fente 12 ou 13 du boîtier 10 (figure 3), l'organe de verrouillage est effacé et le mécanisme 14 est mis à l'état travail, de sorte que le poussoir 15 et le fourreau 17 sont amenés en position haute ; l'organe 16 du bloc de contacts B est alors en position haute et le bloc en position travail. Si l'électroaimant E est mis sous tension ( figure 3 ), le ressort est comprimé et le support 21 descend, de sorte que le coulisseau est renvoyé vers la droite puisque le doigt 27 vient en haut de la partie inclinée 26b de la rampe 26. L'extrémité droite 22b du coulisseau vient s'engager sous la portée 18 du fourreau 17. Il en résulte que le bloc de contacts reste en position travail et que l'actionneur A ne peut être extrait de la tête de commande, ce qui signifie que la porte ou l'organe auquel est associé l'interrupteur reste bloqué en position de sécurité.When the actuator is engaged in the slot 12 or 13 of the housing 10 (FIG. 3), the locking member is deleted and the mechanism 14 is put into the working state, so that the pusher 15 and the sheath 17 are brought up; the member 16 of the contact block B is then in the high position and the block in the working position. If the electromagnet E is energized (Figure 3), the spring is compressed and the support 21 descends, so that the slide is returned to the right since the finger 27 comes at the top of the inclined part 26b of the ramp 26 The right end 22b of the slide engages under the bearing surface 18 of the sheath 17. As a result, the contact block remains in the working position and the actuator A cannot be removed from the control head, which means that the door or the device with which the switch is associated remains locked in the safety position.
Si l'on veut assurer la même fonction de blocage lorsque l'électroaimant est hors tension, il suffit de retourner la pièce d'attelage 25 en l'engageant dans l'évidement rainuré 21a du support 21 comme indiqué sur la figure 5. Il en résulte l'inversion de la rampe 26. Le bloc B reste en position travail et l'actionneur A reste enclenché dans le mécanisme 14 quand l'électroaimant E est désalimenté, ceci ayant pour effet de faire descendre le support 21 et de repousser le coulisseau 22 vers la droite puisque le doigt 27 est alors dans le haut de la partie verticale 26a de la rampe 26.If the same locking function is to be ensured when the electromagnet is de-energized, it suffices to turn the coupling piece 25 by engaging it in the grooved recess 21a of the support 21 as shown in FIG. 5. It this results in the inversion of the ramp 26. The block B remains in the working position and the actuator A remains engaged in the mechanism 14 when the electromagnet E is de-energized, this having the effect of lowering the support 21 and pushing the slide 22 to the right since the finger 27 is then at the top of the vertical part 26a of the ramp 26.
On peut observer que, dans tous les cas, le ressort F est un élément de sécurité qui, sur coupure de l'alimentation de la bobine de l'électroaimant, fait revenir l'interrupteur à sa position initiale de repos (position verrouillée pour un électroaimant de verrouillage sous tension ou position déverrouillée pour un électroaimant de verrouillage hors tension ) .It can be observed that, in all cases, the spring F is a safety element which, upon interruption of the supply of the coil of the electromagnet, returns the switch to its initial position of rest (locked position for a electro magnet with the power on or unlocked position for a power off solenoid).
Claims (5)
- A safety switch comprising:- a housing (10) in which is housed an electrical contact block (B),- a control head (11) attached to the housing in such a way that it may be rotated to different positions around a first axis (X1) and which has on the one hand, at least one slot for inserting a switch actuator (A) and on the other hand, a push rod (15) which moves parallel to the first axis and a transmission mechanism (14) fitted with a roller which can rotate around a second axis (X2), perpendicular to the first axis, to move the push rod following the movement of the actuator,- an electromagnet (E) housed in the housing with a core (20) which moves in a third axis (X3) that is parallel to the first axis and which co-operates with an element (22) which blocks the push rod,characterized in that the core (20) of the electromagnet co-operates with the blocking element (22) through a locking device that may be placed in two positions which permits the push rod to be blocked when the electromagnet is either supplied with power or not supplied with power respectively.
- Safety switch of Claim 1, characterized in that the blocking element (22) is a slide fitted in straight slideways (24) in the housing (10) which co-operates with the core (20) of the electromagnet through a reversible activation ramp coupling (26).
- Safety switch of Claim 2, characterized in that the reversible activation ramp (26) is located on a removable part (25) that is interlocked or fastened by means of a ratchet to a support bracket (21) which moves in a third axis (X3), guided in the slideways (23) of the housing and attached to the core (20).
- Safety switch of Claim 1, characterized in that the blocking element of the push rod (15) co-operates with a seat (18) of a metal sheath (17) co-axially fitted on the push rod to block it.
- Safety switch of Claim 4, characterized in that the metal sheath (17) is pressed against a shoulder (19b) of the following head (19) connected to the control mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9608321A FR2750791B1 (en) | 1996-07-02 | 1996-07-02 | ELECTRIC MAGNET LOCKABLE SAFETY SWITCH |
| FR9608321 | 1996-07-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0817227A1 EP0817227A1 (en) | 1998-01-07 |
| EP0817227B1 true EP0817227B1 (en) | 2001-09-19 |
Family
ID=9493701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97401340A Expired - Lifetime EP0817227B1 (en) | 1996-07-02 | 1997-06-13 | Safety switch that may be locked with an electromagnet |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5861786A (en) |
| EP (1) | EP0817227B1 (en) |
| JP (1) | JP3824381B2 (en) |
| CN (1) | CN1061461C (en) |
| DE (1) | DE69706775T2 (en) |
| ES (1) | ES2160904T3 (en) |
| FR (1) | FR2750791B1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3982143B2 (en) * | 2000-03-15 | 2007-09-26 | オムロン株式会社 | Lock switch device |
| DE10146828A1 (en) * | 2001-09-18 | 2003-04-24 | Euchner Gmbh & Co | Locking system of a safety switch with a read head and an actuator |
| GB0405543D0 (en) * | 2004-03-10 | 2004-04-21 | Eja Ltd | Switch mechanism |
| ATE483243T1 (en) | 2006-07-03 | 2010-10-15 | Siemens Ag | POSITION SWITCH |
| US7902480B2 (en) * | 2007-06-13 | 2011-03-08 | Hitachi, Ltd. | Vacuum insulated switchgear |
| US8017880B2 (en) * | 2008-06-26 | 2011-09-13 | Honeywell International Inc. | Safety switch |
| ITVI20130290A1 (en) * | 2013-12-06 | 2015-06-07 | Pizzato Elettrica Srl | SECURITY SWITCH WITH ELECTRONIC DRIVE |
| IT201600096402A1 (en) * | 2016-09-26 | 2018-03-26 | Pizzato Elettrica Srl | SAFETY SWITCH WITH DETECTION OF THE ACTIVATION OF AN AUXILIARY RELEASE COMMAND |
| US11151822B2 (en) * | 2017-11-08 | 2021-10-19 | Pizzato Elettrica S.R.L. | Safety switch for controlling the access to industrial machines or plants |
| JP7122851B2 (en) | 2018-04-13 | 2022-08-22 | 株式会社キーエンス | safety switch |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3014825C2 (en) * | 1980-04-15 | 1982-10-21 | Siemens AG, 1000 Berlin und 8000 München | Power drive for electrical switching devices with elastic transmission of the drive force |
| DE3430090A1 (en) * | 1984-08-16 | 1986-03-06 | Euchner & Co, 7022 Leinfelden-Echterdingen | Safety switch |
| US4901046A (en) * | 1987-06-09 | 1990-02-13 | Hubert Laurenz Naimer | Manually actuated on-off switch with electromagnetic release |
| CN88202206U (en) * | 1988-03-25 | 1988-11-09 | 付建生 | Electric switch |
| EP0553885B2 (en) * | 1992-01-31 | 2003-12-17 | Omron Corporation | Safety switch |
| GB9326394D0 (en) * | 1993-12-24 | 1994-02-23 | Eja Eng Plc | Safety switch assemblies |
| DE4403061C1 (en) * | 1994-02-02 | 1995-06-22 | Bernstein Classic Gmbh & Co | Safety switching device enclosed by a housing |
-
1996
- 1996-07-02 FR FR9608321A patent/FR2750791B1/en not_active Expired - Fee Related
-
1997
- 1997-06-13 ES ES97401340T patent/ES2160904T3/en not_active Expired - Lifetime
- 1997-06-13 EP EP97401340A patent/EP0817227B1/en not_active Expired - Lifetime
- 1997-06-13 DE DE69706775T patent/DE69706775T2/en not_active Expired - Lifetime
- 1997-06-25 US US08/882,287 patent/US5861786A/en not_active Expired - Lifetime
- 1997-07-02 JP JP17675697A patent/JP3824381B2/en not_active Expired - Fee Related
- 1997-07-02 CN CN97117120A patent/CN1061461C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE69706775T2 (en) | 2002-04-18 |
| CN1174386A (en) | 1998-02-25 |
| CN1061461C (en) | 2001-01-31 |
| US5861786A (en) | 1999-01-19 |
| FR2750791B1 (en) | 1998-10-09 |
| EP0817227A1 (en) | 1998-01-07 |
| DE69706775D1 (en) | 2001-10-25 |
| ES2160904T3 (en) | 2001-11-16 |
| JP3824381B2 (en) | 2006-09-20 |
| JPH113638A (en) | 1999-01-06 |
| FR2750791A1 (en) | 1998-01-09 |
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