EP2112674B1 - Interrupteur de sécurité - Google Patents

Interrupteur de sécurité Download PDF

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Publication number
EP2112674B1
EP2112674B1 EP20080010513 EP08010513A EP2112674B1 EP 2112674 B1 EP2112674 B1 EP 2112674B1 EP 20080010513 EP20080010513 EP 20080010513 EP 08010513 A EP08010513 A EP 08010513A EP 2112674 B1 EP2112674 B1 EP 2112674B1
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EP
European Patent Office
Prior art keywords
slit
actuator
box
door
pin
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.)
Active
Application number
EP20080010513
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German (de)
English (en)
Other versions
EP2112674A3 (fr
EP2112674A2 (fr
Inventor
Marco Pizzato
Simone Zonta
Bernardo Pizzato
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.)
Pizzato Elettrica SRL
Original Assignee
Pizzato Elettrica SRL
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Publication date
Application filed by Pizzato Elettrica SRL filed Critical Pizzato Elettrica SRL
Publication of EP2112674A2 publication Critical patent/EP2112674A2/fr
Publication of EP2112674A3 publication Critical patent/EP2112674A3/fr
Application granted granted Critical
Publication of EP2112674B1 publication Critical patent/EP2112674B1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards

Definitions

  • the present invention generally finds application in the field of electric safety switches and particularly relates to a safety switch apparatus especially adapted to be mounted to safety barriers for protection of industrial machines or plants.
  • these apparatus include an actuator, integral with a door-mounted handle, and a safety switch attached to the frame of the safety perimeter within which the switching circuit is located for causing the plant to be actuated and locked.
  • the actuator In closed-door conditions, the actuator is held in a special receptacle within the safety switch body, for operating on the switching circuit and causing the power supply circuit to close and start the machine or plant within the perimeter.
  • the actuator comes out of the switch body and causes a change of state of one or more electric contacts in the switch, which is followed by the transmission of a safety stop signal.
  • the part that is attached to the door, comprising the actuator, and the remaining part that is attached to the frame shall be aligned with the utmost precision as the door is closed, so that the actuator of the safety switch can fit in its receptacle within the switch, thereby preventing any collision that might damage the most brittle parts of the apparatus.
  • the part that is designed to be attached to the door has one or more brackets with position adjustment slots.
  • German utility model DE29717313 discloses a safety switch in which alignment of the actuator with its receptacle is provided by a center pin associated with the movable part and designed to pass through an alignment hole formed in a metal sheet mounted to the stationary part of the perimeter.
  • this configuration causes high wear and potential damages to the pin, especially when the movable and stationary parts of the apparatus are not properly aligned beforehand.
  • center pin only operates in facing relationship with the installed switch which makes it difficult or even impossible to mount it to sliding doors or anyway non-hinged doors.
  • the actuator and the switch are coupled together by a first door closing motion and second handle motion along a slide.
  • a cover is mounted to the movable or stationary part, for obstructing the actuator receiving hole, which is adapted to be stably locked by one or more padlocks with keys.
  • the object of this invention is to overcome the above drawbacks, by providing a safety switch apparatus that achieves high efficiency and relative cost effectiveness.
  • a particular object is to provide a safety switch apparatus adapted to be mounted to a peripheral safety barrier for protection of industrial machines or plant, that prevents machines or plant from restarting when the safety barrier is open.
  • a further object is to provide an apparatus of the above type that prevents accidental or careless closing of the safety barrier onto which it is mounted.
  • Another object of the present invention is to provide an apparatus of the above mentioned type that ensures high sturdiness and protects the most critical parts from impacts generated by closing the movable part of the barrier and also requires relatively little maintenance.
  • Yet another object of the present invention is to provide an apparatus of the above type that ensures simple and quick centering of the movable and stationary parts and allows the power supply circuit of the machine or equipment to be opened/closed by a single movement.
  • Another object of the present invention is to provide an apparatus of the above type that can be mounted to any kind or sliding or hinged door.
  • a safety switch apparatus as defined in claim 1, comprising a box-like body designed to be mounted to the stationary part of a barrier for protection of an industrial machine or plant and having a first slit, a switching circuit located in said box-like body and designed to be connected to the power supply circuit of the machine or equipment, said switching circuit being actuatable through said first slit, an actuator designed to be associated with the door of the barrier and to be introduced in said first slit for interaction with said switching circuit to open/close the latter, a second slit formed in said box-like body, and adapted to receive a pin attachable to said door in a predetermined position relative to said actuator, for centering and guiding the latter in said first slit as the door is closed, by only performing the door closing motion.
  • means are provided for occluding said second slit in open door conditions, with said actuator not being introduced in said first slit and said power supply circuit being open.
  • the barrier will be prevented from being accidentally or carelessly closed, thus preserving the structural integrity of the brittle parts of the apparatus.
  • the occlusion means are configured for simultaneously occlusing the first and second slits.
  • This particular configuration will also prevent the machine or plant from being restarted by the operation of an additional actuator similar to the first actuator even under open door conditions.
  • the occlusion means may include first and second covers pivoted mounted to the box-like body to move from an inoperative position to an operating position, in which said first and second slits are occluded by a single pivotal motion about said longitudinal axis.
  • the apparatus of the invention may be mounted to a safety barrier B which is adapted to be placed at the periphery of an industrial machine or equipment, not shown, to define a safe working zone.
  • the barrier B may have a stationary part F attachable to the floor and a movable part P defined by a door or the like, which is hinged or anyway connected to the stationary part F to define an access to the working zone.
  • the apparatus may be mounted to similar doors or movable accesses having a right-hand opening, not necessarily hinged, or to sliding doors.
  • the apparatus of the invention comprises a stationary portion 2 which is designed to be mounted to the stationary part F of the barrier B for interaction with a movable portion 3, designed to be mounted to the door P, as the latter is closed and opened.
  • the fixed portion 2 is defined by a box-like body 4 having a first slit 5 and a switching circuit, not shown, located therein for connection with the power supply circuit, also not shown, of the machine or equipment located within the working zone.
  • the switching circuit is operated by an actuator 6 that is designed to be associated with the door P of the barrier B and to be introduced in the first slit 5 for interaction with the switching circuit.
  • the latter may be of well-known type and include, for instance, one or more electric contacts suitably arranged to cause the power supply circuit to open/close as the actuator is ejected/introduced in the first slit 5.
  • the actuator 6 may in turn of the key-operated type, like in the annexed figures, with an active portion 6' and a support portion 6", or may also have other configurations, according to the particular construction requirements and to the particular switching circuit that has been installed.
  • a second slit 7 is also provided in the box-like body 4, for receiving a pin 8 attachable to the door P in a predetermined position relative to the actuator 6 for centering and guiding the latter in the first slit 5 by a single door P closing motion.
  • means 9 are provided for occluding the second slit 7 in open door P conditions, with the actuator 6 not being introduced in the first slit 5 and the power supply circuit being open.
  • the occlusion means 9 may be designed to simultaneously block the first 5 and second 7 slits.
  • the switching circuit cannot be restarted by an additional actuator similar to the one associated to the door P if the latter is open to allow an operator to access the work zone.
  • the center pin 8 and the actuator 6 may be formed of one piece with a first bracket 10 for attachment of the movable portion 3 to the door P.
  • the assembly defined by the first bracket 10, the pin 8 and the actuator 6 may be mounted to the door P via second and third brackets 11, 12, one of which, e.g. the second one 11, may also have a handle or a similar grip member 13, to facilitate opening/closing of the door P.
  • the brackets 10, 11, 12 may have holes or slots 14, 15, 16 respectively, formed therein, for the passage of pins or screws, generally designated by numeral 17, for fastening the brackets 10, 11, 12 and adjusting their mutual positions also in three distinct axes X, Y, Z.
  • the apparatus 1 may be mounted to barriers B with movable P and stationary F parts of different sections and the brackets 10, 11, 12 may be also suitably shaped for mounting to both hinged and sliding doors P.
  • the third bracket 12 may have either front slots 16 extending along parallel axes with different spacings to allow the third bracket 12 to be mounted to doors with profiles of different sizes, or lateral slots 16' allowing lateral mounting to the profile of the door P, in those conditions in which front mounting is not allowed.
  • the three brackets 10, 11, 12 may be fastened together by pins, screws or similar mechanical members, such as screws 17 having a safety locking pin, to prevent any careless disengagement thereof.
  • the apparatus 1 may be adapted to the particular door P closing motion.
  • Fig. 4 and Fig. 5 also show that the box-like body 4 may include a first box-like element 18, having the first slit 5, and holding the switching circuit, and a second box-like element 19 having the second slit 7.
  • the first and second box-like elements 18, 19 may be separated and mounted to a plate 20 designed to be attached to the stationary part F of the barrier B for the first and second slits 5, 7 to be at a predetermined distance d 1 along a substantially vertical longitudinal axis L for alignment with the actuator 6 and the pin 8 respectively.
  • the second box-like element 19 may be symmetrical with respect to the longitudinal axis T to allow mounting thereof to sliding or hinged doors P with either right-hand or left-hand opening.
  • Fig. 6 shows a preferred, non exclusive embodiment of the occlusion means 9 of the invention, in a typical operating sequence in which the occlusion means 9 move from a disabled position OFF, as shown both in Fig. 4 and in the first picture of Fig. 6 , with both slits 5, 7 clear, to an enabled position ON, as shown both in Fig. 7 and in the last picture of Fig. 6 , in which both slits 5, 7 are occluded.
  • the occlusion means 9 may include first and second covers 21 and 22 respectively, which are pivotally mounted to the box-like body 4 to rotate about the common longitudinal axis L from the disabled position OFF to the enabled position ON.
  • first and second covers 21, 22 may be independent of each other to allow separate occlusion of the two slits 5, 7.
  • first and second covers 21, 22 may be integral with each other, with respective longitudinal portions 23, 24 for blocking the first and second slits 5, 7 respectively, to move between the enabled position ON and the disabled position OFF by a single motion, that might be a rotational or translational motion or simply a rotational motion about the longitudinal axis L.
  • first and second covers 21, 22 may be formed of one piece and joined by an intermediate longitudinal portion 25 and transverse portions 26, 27, 28.
  • the second cover 22 may be hinged to the second box-like element 19 to move from the disabled position OFF to the enabled position ON by a first transverse sliding ejection motion, as shown in the second picture of Fig. 6 , followed by a clockwise or counterclockwise rotation about the longitudinal axis L and a second transverse sliding positioning and locking motion.
  • the first cover 21 will simultaneously close the first slit 5, thereby preventing the switch from being actuated by a second actuator, similar to the first actuator 6, that might be intentionally introduced by an operator in the first slit 5.
  • the covers 21, 22 may be made of metal or any other material of adequate rigidity, so that the force with which the pin 8 hits the second cover 22 would discharge on the second box-like element 19 through their respective contact faces, and hence on the stationary structure F of the barrier B, thereby preventing load discharge on parts of lower strength.
  • safety means 33 may be provided to prevent any accidental rotation of the occlusion means 9 from the enabled position ON to the disabled position OFF.
  • the safety means 33 may include one or more through holes, generally designated by numeral 34, formed in the upper transverse portion 26 of the second cover 22, for alignment with corresponding passages 35 formed in the second box-like element 19.
  • the occlusion means 9 when the occlusion means 9 are in the enabled position ON, they may be stably locked by one or more locking devices S, such as one or more key padlocks, as shown in Fig. 7 .
  • This additional feature will prevent the occlusion means 9 from being accidentally or carelessly unlocked into the disabled position OFF, while an operator is in the work zone.
  • the occlusion means 9 may be associated with counteracting elastic means 36 operating on at least one of the first and second covers 21, 22 to hold them in one of the enabled ON and disabled OFF positions, and prevent any undesired motion thereof possibly due to minor accidental impacts.
  • the counteracting elastic means 36 may include a snap arrangement composed of two balls 37 held by two springs 38 in two suitable recesses 39 formed in the second box-like element 19.
  • the springs 38 may be loaded by the screws 40, 40' that fasten the two longitudinal pins 29, 29' to the second cover 22.
  • a hole 41 may be formed in the transverse portion 28 of the first cover 21 for easier tightening of the lower safety screw 40.
  • centering and guiding pin 8 and the actuator 6 may project out of the first bracket 10 in respective substantially parallel and longitudinally offset transverse directions having a predetermined distance d 2 from each other, which will preferably be equal to the longitudinal distance d 1 between the first and second slits 5, 7.
  • the second slit 7 may have a substantially cylindrical shape 42 with a substantially cylindrical transverse lateral surface, having an open end 43 for receiving the center pin 8 and an opposite closed end 44 that defines an abutment for such pin 8, which may also have a substantially cylindrical shape and a rounded free transverse end 45.
  • cylindrical lateral surface 42 of the second slit 7 may have an entry portion 46 with an inside diameter ⁇ 1 considerably larger than the diameter ⁇ 2 of the rest of the lateral surface 42 and diverging towards the closed end 44 thereof to define a relatively wide lead-in portion for the pin 8.
  • the center pin 8 may have a transverse extension I 1 longer than the extension I 2 of the actuator 6, whereas the second slit 7 may have a suitably sized maximum transverse extension I 3 to allow abutment of the pin 8 against the closed end 44 of the second slit 7 prior to contact of the actuator 6 with the bottom of the first slit 5.
  • the actuator 6 and the first slit 5 may be formed of such a size that the active part 6' of the actuator 6 cannot abut against the bottom of the first slit 5.
  • a predetermined span p is provided between the support 6" of the actuator 6 and the first box-like element 18 to prevent any impact between the actuator 6 and the box-like body 4, that might damage the brittle parts of the former.
  • the invention fulfills the intended objects and particularly meets the requirement of providing a safety switch apparatus that prevents the restart of machines or equipment within the safety zone delimited by the barrier onto which the apparatus is mounted when the barrier is open.

Claims (15)

  1. Dispositif à interrupteur de sécurité pour une barrière de protection d'une zone de travail, laquelle barrière (B) comprend une partie fixe (F) délimitant une zone de travail d'une machine ou d'une installation industrielle et au moins une porte (P) ou l'analogue pour l'accès à ladite zone de travail, le dispositif comprenant :
    - un corps de type boîte (4) conçu pour être monté sur la partie fixe (F) de la barrière de protection (B) et ayant une première fente (5) ;
    - un circuit de commutation situé dans ledit corps de type boîte (4) et conçu pour être connecté au circuit d'alimentation électrique de la machine ou de l'installation, ledit circuit de commutation étant conçu pour être actionné à travers ladite première fente (5) ;
    - un actionneur (6) qui est conçu pour être associé à la porte (P) de la barrière (B) et pour être introduit dans ladite première fente (5) pour interagir avec ledit circuit de commutation pour l'ouverture/fermeture de celui-ci ;
    - une deuxième fente (7) formée dans ledit corps de type boîte (4), et adapté pour recevoir un ergot (8) fixé à ladite porte (P) dans une position prédéterminée par rapport audit actionneur (6) pour le centrage et le guidage de celui-ci dans ladite première fente (5) sous l'effet d'un seul mouvement de fermeture de la porte (P) ;
    caractérisé en ce qu'il comprend des moyens (9) pour obturer ladite deuxième fente (7) dans des conditions de porte (P) ouverte, où ledit actionneur (6) n'est pas introduit dans ladite première fente (5) et ledit circuit d'alimentation électrique est ouvert.
  2. Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens d'occlusion (9) sont conçus pour obturer lesdites première (5) et deuxième (7) fentes en même temps.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que lesdits moyens d'occlusion (9) comprennent des premier et deuxième caches (21, 22) qui sont associés audit corps de type boîte (4) de façon à se déplacer d'une position "moyens inactifs" (OFF), dans laquelle lesdites première et deuxième fentes (5, 7) sont dégagées, vers une position "moyens actifs" (ON), dans laquelle lesdits premier et deuxième caches (21, 22) bouchent respectivement lesdites première et deuxième fentes (5, 7).
  4. Dispositif selon la revendication 3, caractérisé en ce que lesdits premier et deuxième caches (21, 22) sont articulés sur ledit corps de type boîte (4) de façon à pivoter entre ladite position "moyens inactifs" (OFF) et ladite position "moyens actifs" (ON) autour d'un axe longitudinal commun (L).
  5. Dispositif selon la revendication 4, caractérisé en ce que lesdits premier et deuxième caches (21, 22) sont solidaires l'un de l'autre pour permettre auxdites première et deuxième fentes (5, 7) d'être obturées par un unique mouvement de rotation autour dudit axe longitudinal commun (L).
  6. Dispositif selon la revendication 4 ou 5, caractérisé en ce qu'il comprend des moyens de sécurité (33) conçus pour empêcher toute rotation accidentelle desdits premier et deuxième caches (21, 22) de ladite position "moyens actifs" (ON) à ladite position "moyens inactifs" (OFF).
  7. Dispositif selon la revendication 6, caractérisé en ce que ledit deuxième cache (22) a une partie d'obturation longitudinale (24) et au moins une partie essentiellement transversale (26) articulée sur ledit corps de type boîte (4) pour permettre ledit mouvement de rotation par rapport audit axe longitudinal (L).
  8. Dispositif selon la revendication 7, caractérisé en ce que lesdits moyens de sécurité (33) comprennent au moins un trou débouchant (34) formé dans ladite au moins une partie transversale (26) dudit deuxième cache (22) et au moins un passage (35) formé dans ledit corps de type boîte (4), ledit au moins un trou (34) et ledit au moins un passage étant adaptés pour être alignés dans la direction longitudinale, lorsque lesdits moyens d'occlusion (9) sont dans ladite position "moyens actifs" (ON), pour permettre leur verrouillage par un dispositif de verrouillage (S) introduit dans ceux-ci.
  9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits moyens d'occlusion (9) sont équipés de moyens élastiques d'opposition (36) agissant sur au moins l'un desdits premier et deuxième caches (21, 22) pour les retenir dans l'une desdites positions "moyens actifs" (ON) et "moyens inactifs" (OFF).
  10. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit ergot de centrage et de guidage (8) et ledit actionneur (6) sont solidaires d'une première console (10) et de ladite partie mobile (P) de façon à en dépasser dans des directions transversales respectives (T, T') essentiellement parallèles et décalées l'une par rapport à l'autre dans la direction longitudinale, avec une distance prédéterminée d2 entre elles.
  11. Dispositif selon la revendication 10, caractérisé en ce que lesdites premières et deuxième fentes (5, 7) sont décalées dans la direction longitudinale d'une distance (d1) essentiellement égale à la distance longitudinale (d2) entre ledit ergot (8) et ledit actionneur (6).
  12. Dispositif selon la revendication 10 ou 11, caractérisé en ce que ladite deuxième fente (7) a une extension essentiellement transversale, avec une surface latérale cylindrique (42) ayant une extrémité ouverte (43) pour l'introduction dudit ergot de centrage (8) et une extrémité fermée opposée (44) définissant une butée pour cet ergo (8).
  13. Dispositif selon la revendication 12, caractérisé en ce que ledit ergot de centrage (8) a une forme essentiellement cylindrique et une extrémité transversale libre arrondie (45), ladite surface latérale cylindrique (42) de ladite deuxième fente (7) ayant une partie d'entrée divergente (46) menant vers ladite extrémité fermée (44) pour définir une surface d'entrée pour ledit ergot (8).
  14. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit ergot de centrage (8) a une extension transversale (I1) plus longue que l'extension (I2) dudit actionneur (6), ladite deuxième fente (7) ayant une extension transversale maximale de taille appropriée (I3) pour permettre la venue en butée dudit ergot (8) contre ladite extrémité fermée (44) avant que ledit actionneur (6) entre en contact avec le fond de ladite première fente (5).
  15. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit corps de type boîte (4) comprend un premier élément de type boîte (18), ayant ladite première fente (5), et un deuxième élément (19) ayant ladite deuxième fente (7), ledit deuxième élément de type boîte (19) étant symétrique par rapport audit axe longitudinal (L).
EP20080010513 2008-04-24 2008-06-09 Interrupteur de sécurité Active EP2112674B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVI20080101 ITVI20080101A1 (it) 2008-04-24 2008-04-24 Apparato ad interruttore di sicurezza.

Publications (3)

Publication Number Publication Date
EP2112674A2 EP2112674A2 (fr) 2009-10-28
EP2112674A3 EP2112674A3 (fr) 2010-09-08
EP2112674B1 true EP2112674B1 (fr) 2012-04-25

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EP20080010513 Active EP2112674B1 (fr) 2008-04-24 2008-06-09 Interrupteur de sécurité

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IT (1) ITVI20080101A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5108129B2 (ja) 2011-04-13 2012-12-26 ファナック株式会社 衝突防止機能を有するスイッチ装置
DE102012111342A1 (de) * 2012-11-23 2014-05-28 Pilz Gmbh & Co. Kg Schutztürüberwachungssystem
ITVI20130290A1 (it) 2013-12-06 2015-06-07 Pizzato Elettrica Srl Interruttore di sicurezza ad azionamento elettronico
TR201907775T4 (tr) 2014-04-11 2019-06-21 Pizzato Elett S R L Kilitleme cihazına sahip güvenlik anahtarı.
ITUA20163940A1 (it) * 2016-05-30 2017-11-30 Pizzato Elettrica Srl Interruttore di sicurezza per il controllo di accessi
IT201800005913A1 (it) * 2018-05-31 2019-12-01 Maniglia di sicurezza per il controllo di accessi di macchine o impianti industriali
IT201800005914A1 (it) * 2018-05-31 2019-12-01 Maniglia di sicurezza per il controllo di accessi di macchine o impianti industriali
IT201900011694A1 (it) 2019-07-12 2021-01-12 Pizzato Elettrica Srl Interruttore di sicurezza con touch panel per il controllo di accessi di macchine o impianti industriali

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2031595A1 (de) 1970-06-26 1971-12-30 Siemens Ag Röntgen-Stereoeinrichtung
FR2767854B1 (fr) 1997-09-02 2000-06-23 Gunnebo Troax Ab Serrure de portes d'enceintes industrielles
DE29717313U1 (de) 1997-09-27 1999-01-28 Kloeckner Moeller Gmbh Anordnung mit Sicherheitspositionsschalter
JP4520709B2 (ja) 2003-05-30 2010-08-11 サンクス株式会社 安全スイッチ
JP4351608B2 (ja) 2004-11-12 2009-10-28 オムロン株式会社 スライドキーおよびドアスイッチ
JP4710648B2 (ja) 2006-02-23 2011-06-29 オムロン株式会社 安全スイッチ

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ITVI20080101A1 (it) 2009-10-25
EP2112674A3 (fr) 2010-09-08
EP2112674A2 (fr) 2009-10-28

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