EP0755063A1 - Interrupteur de sécurité électromagnétique verrouillé à l'aide d'une clé - Google Patents

Interrupteur de sécurité électromagnétique verrouillé à l'aide d'une clé Download PDF

Info

Publication number
EP0755063A1
EP0755063A1 EP96830154A EP96830154A EP0755063A1 EP 0755063 A1 EP0755063 A1 EP 0755063A1 EP 96830154 A EP96830154 A EP 96830154A EP 96830154 A EP96830154 A EP 96830154A EP 0755063 A1 EP0755063 A1 EP 0755063A1
Authority
EP
European Patent Office
Prior art keywords
key
cam actuator
slot
operating key
switch according
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.)
Withdrawn
Application number
EP96830154A
Other languages
German (de)
English (en)
Inventor
Glauco Bernier
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.)
REITER Srl
Original Assignee
REITER Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by REITER Srl filed Critical REITER Srl
Publication of EP0755063A1 publication Critical patent/EP0755063A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards

Definitions

  • the present invention relates to a key-locked electromechanical safety switch of the type comprising a main body adapted to house electrical contacts, a control head provided with a cam actuator and integrally connected with the main body, a pusher, operated by the cam actuator, for switching over the electrical contacts, and an operating key insertable into a slot formed in the control head and adapted to set the cam actuator in rotation, said slot defining a fitting direction of the operating key in the control head.
  • the international rules impose that operation of the sliding protection barrier for some types of machines shall take place by means of an electromechanical key-locked switch fastened to the sliding barrier itself, which switch enables the feeding circuit to be cut off and the protected machine operation to be stopped in case of an incautious opening of the barrier.
  • the key-locked electromechanical switches are usually comprised of a main body or contact block adapted to house the electrical contacts and of a control head connected with the main body and provided with a cam actuator.
  • Said actuator has a profile formed with appropriate projections and hollows capable of shifting a pusher acting on the electrical contacts, which emerges from the main body and is elastically pushed against the cam itself.
  • a slot Formed in the control head is a slot into which a substantially flattened operating key is insertable, which key is adapted to set the cam actuator in rotation in either direction depending on whether it is moved to the inside of the slot or pulled out of the slot itself.
  • the technical task underlying the present invention is to provide a key-locked electromechanical safety switch capable of substantially eliminating the above mentioned drawbacks.
  • a key-locked electromechanical safety switch which is characterized in that it comprises a tampering-preventing device disposed within said control head close to said slot, said tampering-preventing device having at least one safety element movable between a stop position adapted to block rotation of said cam actuator and a release position of said cam actuator, which is activated by the thrust action of said operating key on the safety element during insertion of the key into said slot.
  • the key-locked electromechanical safety switch in accordance with the invention is generally identified by reference numeral 1. It comprises a main body or contact block 2 adapted to house electrical contacts 3, in turn consisting of a normally closed contact and a normally opent contact, for example.
  • control head 4 Integral with the main body 2 is a control head 4 formed with a slot 5 defining a fitting direction 6 for a special operating key 7.
  • the control head 4 can be applied to the main body 2 according to positions differentiated from each other and rotated through 90° so that, depending on requirements, the best orientation of the slot 5, and therefore of the key-fitting direction, can be selected.
  • a cam actuator 8 Disposed within the control head 4 is a cam actuator 8 having a profile formed with projections and hollows adapted to perform functions known in themselves.
  • a pusher 9 elastically abuts against one portion of the cam actuator 8 profile, said pusher being adapted to switch over the position of the electrical contacts 3. Another portion of the cam actuator 8 profile is acted upon by the key 7 in order to set said actuator in rotation in either direction depending on whether the key is introduced into or drawn out of the slot 5.
  • the operating key 7 has a conventional shape typical of this kind of switches: that is, it comprises two longitudinal parallel portions 7a and two transverse stretches 7b delimiting a through cavity 10 which is adapted to house a corresponding first projection 8a of the cam 8 profile (see Fig. 5).
  • the key 7 has a recess 11 at the front which matches with a second projection 8b of the cam 8 in a first length of its insertion stroke into the slot 5.
  • the switch 1 comprises a tampering-preventing device 12 disposed within the control head 4, close to the slot 5.
  • the device 12 in turn comprises two safety elements 13 each consisting of a shaped plate-like body having one stop end 13a insertable into a corresponding stepped hollow 14 formed in the cam 8 profile at an appropriate position, and a second drive end 13b defined by a thrust edge emerging at the inside of slot 5 and inclined to the fitting direction 6 of the operating key 7.
  • Each safety element 13 is movable independently of the other safety element, transversely of the fitting direction 6, between a stop position (shown in Figs. 1 and 4), in which the first end 13a is inserted in the hollow 14 and holds the cam actuator 8 against rotation, and a release position (Fig. 5) activated by a thrust action exerted on the second end 13b of the key 7 introduced into the slot 5, in which the first end 13a is disengaged from hollow 14 thereby enabling rotation of the cam 8 itself.
  • a spring 15 is provided which is adapted to elastically abut, by its first and 13a, against the stepped hollow 14.
  • the degree of displacement of the safety element 13 is given by the operating key 7 thickness. This thickness must therefore have a gauged value higher than the stroke necessary for the safety element 13 to pass from the stop position of cam 8 to the release position of the latter.
  • the two safety elements 13 are such positioned in the control head 4 that their second drive ends 13b are spaced apart from each other to an extent corresponding to the distance between the longitudinal portions 7a of the operating key 7. This feature enables said key to simultaneously press on both the safety elements 13 when it is introduced into the slot 5, and therefore to jointly disengage the first stop ends 13a from the cam actuator hollow 14.
  • the alternative solution illustrated therein provides for the presence of at least one rib 16 arranged between the two adjacent projections 8a and 8b.
  • the rib 16 is intended for engagement in an opening 17 formed in the front transverse stretch 7b of the operating key 7.
  • the external profile of the rib 16 extends continuously and flush with the perimetric external profiles of the projections 8a and 8b. In this way, the rib 16 counteracts the insertion of even a clip, thereby enabling operation of the cam actuator 8 only by means of the operating key 7 shown in Fig. 6.
  • the operating key 7 being pulled out drags the cam actuator along in the opposite rotation direction, due to the action of the front transverse stretch 7b, and the pusher 9 brings the electrical contacts 3 back to their starting position as soon as the longitudinal portions 7a of the key stop pressing against the second ends 13b of elements 13.
  • the switch in accordance with the invention offers a high degree of safety against the most different tampering attempts and ensures to an appropriate degree that setting in operation of plants, machines, apparatuses is really enabled only by the authorized staff in possession of the special operating keys.
  • the materials, shapes and sizes may be of any nature and magnitude in accordance with requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
EP96830154A 1995-07-21 1996-03-26 Interrupteur de sécurité électromagnétique verrouillé à l'aide d'une clé Withdrawn EP0755063A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95MI001578A IT1275586B1 (it) 1995-07-21 1995-07-21 Interruttore elettromeccanico di sicurezza a chiave
ITMI951578 1995-07-21

Publications (1)

Publication Number Publication Date
EP0755063A1 true EP0755063A1 (fr) 1997-01-22

Family

ID=11372026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96830154A Withdrawn EP0755063A1 (fr) 1995-07-21 1996-03-26 Interrupteur de sécurité électromagnétique verrouillé à l'aide d'une clé

Country Status (2)

Country Link
EP (1) EP0755063A1 (fr)
IT (1) IT1275586B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0977227A3 (fr) * 1998-07-30 2000-10-04 Omron Corporation Ensemble de commutation à clef
EP1883090A1 (fr) * 2006-07-28 2008-01-30 Eja Limited Interrupteur de sécurité
EP2506279A1 (fr) * 2011-04-01 2012-10-03 Idem Safety Switches Limited Système de came anti-sabotage
WO2012149665A1 (fr) * 2011-05-04 2012-11-08 HONEYWELL INTERNATIONAL INC. Attn: Patent Services Mécanisme d'actionnement de commutateur
CN111489904A (zh) * 2019-01-28 2020-08-04 罗伯特·博世有限公司 断路开关装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655182A1 (fr) * 1989-11-27 1991-05-31 Telemecanique Systeme interrupteur de securite fonctionnant par insertion et extraction d'une cle.
DE4328296C1 (de) * 1993-08-23 1994-11-24 Euchner & Co Sicherheitsschalter
DE4338910C1 (de) * 1993-11-15 1995-02-16 Bernstein Hans Spezialfabrik Sicherheitsschalter
DE4408024A1 (de) * 1994-03-10 1995-09-14 Euchner & Co Sicherheitsschalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655182A1 (fr) * 1989-11-27 1991-05-31 Telemecanique Systeme interrupteur de securite fonctionnant par insertion et extraction d'une cle.
DE4328296C1 (de) * 1993-08-23 1994-11-24 Euchner & Co Sicherheitsschalter
DE4338910C1 (de) * 1993-11-15 1995-02-16 Bernstein Hans Spezialfabrik Sicherheitsschalter
DE4408024A1 (de) * 1994-03-10 1995-09-14 Euchner & Co Sicherheitsschalter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0977227A3 (fr) * 1998-07-30 2000-10-04 Omron Corporation Ensemble de commutation à clef
US6307167B1 (en) 1998-07-30 2001-10-23 Omron Corporation Key switch
EP1883090A1 (fr) * 2006-07-28 2008-01-30 Eja Limited Interrupteur de sécurité
EP2506279A1 (fr) * 2011-04-01 2012-10-03 Idem Safety Switches Limited Système de came anti-sabotage
WO2012149665A1 (fr) * 2011-05-04 2012-11-08 HONEYWELL INTERNATIONAL INC. Attn: Patent Services Mécanisme d'actionnement de commutateur
CN111489904A (zh) * 2019-01-28 2020-08-04 罗伯特·博世有限公司 断路开关装置

Also Published As

Publication number Publication date
IT1275586B1 (it) 1997-08-06
ITMI951578A1 (it) 1997-01-21
ITMI951578A0 (it) 1995-07-21

Similar Documents

Publication Publication Date Title
US10738505B2 (en) Door lock with door switch
EP1740752B1 (fr) Verrou pour appareil menager
US5690373A (en) Electromagnetic lock
US4902862A (en) Keyboard switch device for facilitating removal and replacement of push buttons
JPH06203222A (ja) 端部位置スイッチを備えたチップカードリーダ
GB2091043A (en) Electrical switches
US5703339A (en) Safety switch
CN1324493A (zh) 保护道路交通车辆内电路的保护开关
EP0755063A1 (fr) Interrupteur de sécurité électromagnétique verrouillé à l'aide d'une clé
EP1690272A1 (fr) Circuit et dispositif de detection de diverses positions d'un element de porte
EP0695472B1 (fr) Installation de distribution electrique basse tension avec un support d'appareils et un dispositif de contact disjoncteur
US3906176A (en) Tamperproof switch
US6483053B2 (en) Lock switch apparatus
EP0347592A1 (fr) Dispositif de verrouillage de porte pour appareils électriques
US5825269A (en) Electromagnetic switchgear
DE4229756A1 (de) Elektrisches Schaltgerät
ATE198809T1 (de) Sicherheitsvorrichtung für positionsschalter
DE102005017870A1 (de) Verschluß für ein Hausgerät
US4276453A (en) Electric switching device on a rotary cylinder lock
DE19627294A1 (de) Wipptaster
DE2937925C3 (de) Schalter
EP0773567B1 (fr) Interrupteur à bouton poussoir
US5661275A (en) Self adjusting switch mechanism
EP0871188A1 (fr) Interrupteur de sécurité à clé
EP0883148A3 (fr) Dispositif d'actionnement pour disjoncteur avec interrupteur de mise hors service

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR IT

17P Request for examination filed

Effective date: 19970630

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19991001