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 PDFInfo
- 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- Withdrawn
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)
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)
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)
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 |
-
1995
- 1995-07-21 IT IT95MI001578A patent/IT1275586B1/it active IP Right Grant
-
1996
- 1996-03-26 EP EP96830154A patent/EP0755063A1/fr not_active Withdrawn
Patent Citations (4)
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)
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 |