EP0849750B1 - Zeitgesteuerter elektromechanischer Sicherheitsschalter - Google Patents

Zeitgesteuerter elektromechanischer Sicherheitsschalter Download PDF

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Publication number
EP0849750B1
EP0849750B1 EP97119512A EP97119512A EP0849750B1 EP 0849750 B1 EP0849750 B1 EP 0849750B1 EP 97119512 A EP97119512 A EP 97119512A EP 97119512 A EP97119512 A EP 97119512A EP 0849750 B1 EP0849750 B1 EP 0849750B1
Authority
EP
European Patent Office
Prior art keywords
enclosure
switch according
switch
locking
delay
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
Application number
EP97119512A
Other languages
English (en)
French (fr)
Other versions
EP0849750A2 (de
EP0849750A3 (de
Inventor
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 EP0849750A2 publication Critical patent/EP0849750A2/de
Publication of EP0849750A3 publication Critical patent/EP0849750A3/de
Application granted granted Critical
Publication of EP0849750B1 publication Critical patent/EP0849750B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 timed safety switch of the type which can be applied to the doors of protective housings of moving parts of automatic machines and automatic apparatus in general.
  • These switches are adapted to automatically interrupt the electrical power supply of the machine whenever attempts are made to open the door and are adapted to lock the door for a time which is long enough to protect the operator from the risks related to the residual kinetic energy of any moving parts of the machine which are protected by the housing.
  • Conventional safety switches of the above cited type essentially include a casing enclosing a series of fixed electrical contacts which interact with other contacts which can move between a closed position and an open position, a means for opening and closing the contacts and a means for the timed mechanical locking of the door.
  • the locking means is essentially mechanical and includes a threaded pin which engages the enclosure and has one end which is fixed to an actuation knob and the opposite end which protrudes by a certain extent toward the outside of the enclosure for insertion in a suitable seat of the door in order to selectively lock its opening.
  • the threaded pin also controls the opening and closure of the electrical contacts according to a preset timing sequence.
  • This conventional switch is usually applied to the body of a machine compartment in order to interact with the closure door.
  • the door can be either of the sliding or hinged type.
  • the switch is usually applied so that the pin can interact selectively with a hole which is formed radially on one of the rotation hinges of the door.
  • a drawback of this conventional switch is that it does not always ensure high reliability and a sufficient degree of accident-prevention safety.
  • this conventional switch In order to obviate this drawback, this conventional switch must be applied so as to interact with the side of the door which lies opposite to the hinge side, but even this construction has the significant drawback that it allows to actuate the switch even when the door is not perfectly closed and therefore the switch, on its own, does not ensure a sufficient degree of accident-prevention safety.
  • DE-A-392 3663 discloses a safety switching unit comprising a combination of features as defined in the pre-characterizing portion of the appended claim 1.
  • An aim of the invention is to eliminate the above drawbacks, providing a timed safety switch which is simple and reliable and ensures maximum accident-prevention safety.
  • this aim is achieved by a timed safety switch according to claim 1.
  • the timed safety switch essentially includes an enclosure 2 which can be anchored to the main body of a machine or apparatus and internally accommodates a series of fixed electrical contacts 3 and moving electrical contacts 3'.
  • the switch comprises a door locking means including a safety key 4 which can be rigidly coupled to the door.
  • the switch also comprises, inside the enclosure, a locking pin 5 which can be coupled to an actuation means for the actuation of the electrical contacts 3 by virtue of a delay means which are suitable to anticipate or delay the coupling of the pin 5 with the shank 6, so as to delay the release/locking of the door with respect to the opening/closure of the electrical contacts 3.
  • a consent means allows the insertion/extraction of the safety key 4, through a slot 7 formed on the enclosure 2, only when the delay means is in the inactive position.
  • the consent means is constituted by a rotating cam 8 with at least one tooth 9 along the outer profile for engaging the key 4 and a peripheral groove 10 which is adapted to engage the locking pin 5.
  • the delay means is exclusively mechanical.
  • the delay means includes a threaded pin 11 having longitudinal ends rigidly coupled to the shank 6 and to the locking pin 5 respectively.
  • the delay means is operatively coupled to a control means for the axial translatory motion of the threaded pin 11 between an active position and an inactive position.
  • the control means comprises a female thread which is formed centrally in a first gear 12 which is rotatably coupled to the enclosure 2 and in which the threaded pin 11 engages.
  • the first gear is coupled to a second gear 13 which can be actuated manually from the outside of the enclosure.
  • the actuation of the gear assembly causes the axial translatory motion of the threaded pin 11, which in turn produces, at different times, the axial translatory motion of the locking pin 5 between an extended position for locking the cam 8 and a retracted position in which the cam can rotate freely, and produces the translatory motion of the shank 6 between an open position and a closed position of the contacts 3.
  • these translatory motions of the locking pin 5 and of the shank 6, respectively occur in a preset timing sequence which depends on the length of the threaded pin 11, on the pitch thereof, and on the speed with which the user manually operates the second gear 13.
  • the enclosure 2 of the switch can be constituted by a main body 14 which is coupled to a head 15, which is removable and can be orientated in multiple positions in order to facilitate the installation of the switch and in which there is the slot 7 for the insertion of the safety key 4.
  • the threaded pin 11 is installed transversely with respect to the locking pin 5 and to the shank 6 and has an outer portion which screws onto a ring 16 which is rotatably rigidly coupled to the enclosure 2, can be accessed from outside and forms the control means.
  • the innermost end of the threaded pin 11 is rigidly coupled to a tang 17 which forms two surfaces 18 and 19 which are substantially shaped like inclined planes, are mutually staggered and are adapted to interact respectively with the shank 6 and with the locking pin 5 in order to promote their respective translatory motions.
  • the delay means is constituted by a rod 20 which is slidingly mounted on the enclosure 2 and lies substantially transversely to the locking pin 5 and to the shank 6.
  • the rod 20 is elastically biased by a spring 21 and is provided with a button 22 at its outer end and with a portion 23 at its inner end.
  • the portion 23 forms two inclined surfaces 24 and 25 which are mutually staggered and interact respectively with the locking pin 5 and with the shank 6 to promote their respective translatory motions.
  • a rack 26 which engages a delay gear 27 which has a transmission ratio which is preset according to the intended delay action.
  • the rod 20 In the active position of the locking pin 5, the rod 20 is substantially retracted inside the enclosure 2 and is kept therein in a stable position by removable retainers 28; the release of the retainers causes the protrusion of the rod from the enclosure with a slow movement which is delayed by the rotational actuation of the gears 27.
  • the timed safety switch according to the invention fully achieves the intended aim, and in particular attention is drawn to its high reliability and precision in operation, ensured by its purely mechanical actuation systems.
  • the switch according to the invention can be reset only in absolutely safe conditions, when the safety key is correctly inserted in the appropriately provided slot and therefore when the protective door of the machine in which it is installed is properly closed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)
  • Air Bags (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Telephone Function (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Claims (14)

  1. Zeitgesteuerter Sicherheitsschalter, insbesondere für Abdeckungen an Maschinen und Vorrichtungen zur Unfallverhütung, mit einem Deckel (2), der an dem Körper der Maschinen oder Vorrichtungen befestigt werden kann und im Inneren eine Reihe fester elektrischer Kontakte (3) und beweglicher elektrischer Kontakte (3') aufnimmt, einer Einrichtung (4, 5) zum Verschließen der Abdeckung, wobei diese Einrichtung zugänglich ist von aussen und für den Betrieb verbunden ist mit einer Einrichtung (6) zum Betätigen dieses elektrischen Schalters, einer Verzögerungs-Einrichtung (11) zur Vorwegnahme oder Verzögerung des Betriebs der Einrichtung (4, 5) zum Verschließen hinsichtlich der Betätigung dieses Schalters, wobei die Verzögerungs-Einrichtung (11) beweglich ist zwischen einer aktiven Position und einer inaktiven Position, und die Einrichtung (4, 5) zum Verschließen einen Sicherheitsschlüssel (4), der an dieser Abdeckung befestigt werden kann und in einen Schlitz (7) dieses Deckels (2) gesteckt werden kann, eine Zustimmungs-Einrichtung (8), die bewegt werden kann zwischen einer Freigabe-Stellung für den Schlüssel (4) zur Freigabe des Einführens/Abziehens des Schlüssels (4) durch diesen Schlitz (7), wenn die Verzögerungs-Einrichtung (11) in ihrer inaktiven Position ist, und einer Sperr-Stellung für den Schlüssel (4) zum Sperren des Einführens/Abziehens des Schlüssels (4) durch diesen Schlitz (7), wenn die Verzögerungs-Einrichtung (11) in ihrer aktiven Position ist, aufweist,
    dadurch gekennzeichnet, dass die Einrichtung (4, 5) zum Verschließen einen beweglichen Schließstift (5) enthält, der verbunden ist mit der Verzögerungs-Einrichtung (11) und zusammen wirkt mit der Zustimmungs-Einrichtung (8), und wobei die Zustimmungs-Einrichtung einen rotierenden Nocken (8) aufweist, mit mindestens einem Zahn (9) am äußeren Umriß zum Eingriff mit dem Schlüssel (4) und mindestens einen Sitz (10), der angepaßt ist, den Schließstift (5) wahlweise aufzunehmen.
  2. Schalter gemäß Anspruch 1, dadurch gekennzeichnet, dass die Verzögerungs-Einrichtung rein mechanischer Art ist und einen Stift (11) mit Gewinde aufweist, der mit dem Schließstift (5) und mit der Betätigungs-Einrichtung (6) gemäß einer vorher eingestellten Zeitfolge zusammen wirkt.
  3. Schalter gemäß Anspruch 1, dadurch gekennzeichnet, dass die Verzögerungs-Einrichtung (11) funktional verbunden ist mit einer Steuereinrichtung (12, 13), die zugänglich ist von außerhalb des Deckels (2) und geeignet ist die axiale Translationsbewegung des Stifts (11) mit Gewinde zwischen einer aktiven Position und einer inaktiven Position zu fördern.
  4. Schalter gemäß Anspruch 1, dadurch gekennzeichnet, dass der Stift (11) mit Gewinde funktional verbunden ist mit einem länglichen Bolzen (6), der die Betätigungs-Einrichtung bildet und auf die Kontakte (3) wirkt, um diese zwischen einer offenen und einer geschlossenen Position zu schalten.
  5. Schalter gemäß Anspruch 1, dadurch gekennzeichnet, dass die Steuereinrichtung ein erstes Zahnrad (12), das drehbar starr verbunden ist mit dem Deckel (2) und ein zentrales Aufnahmegewinde aufweist, in das der Stift (11) mit Gewinde eingreift, wobei das erste Zahnrad (12) verbunden ist mit einem zweiten Zahnrad (13), das von außerhalb des Deckels (2) betätigt werden kann.
  6. Schalter gemäß Anspruch 1, dadurch gekennzeichnet, dass der Stift (11) mit Gewinde im wesentlichen parallel und koaxial zu dem Bolzen (6) und zu dem Schließstift (5) angeordnet ist.
  7. Schalter gemäß Anspruch 1, dadurch gekennzeichnet, dass der Stift (11) mit Gewinde im wesentlichen quer zu dem Stift (11) mit Gewinde angeordnet ist und einen äußeren Abschnitt aufweist, der in einen Ring (16) mit Gewinde eingreift, der drehbar starr verbunden ist mit dem Deckel (2) und von außen betätigt werden kann und ein inneres Ende aufweist, das starr verbunden ist mit einem Zapfen (17), der zwischen dem Bolzen (6) und dem Schließstift (5) angeordnet ist.
  8. Schalter gemäß Anspruch 7, dadurch gekennzeichnet, dass der Zapfen (17) zwei geneigte Flächen (18, 19) aufweist, die gegenseitig versetzt sind und jeweils mit dem Zapfen (17) und dem Schließstift (5) zusammen wirken, um ihre jeweiligen axialen, translatorischen Bewegungen gemäß einer vorher eingestellten Zeitfolge zu fördern.
  9. Schalter gemäß einem oder mehrerer der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei dem Stift (11) mit Gewinde, die Gewindesteigung und die Länge des Abschnitts mit Gewinde voreingestellt sind gemäß einer gewählten Betätigungsverzögerung.
  10. Schalter gemäß Anspruch 1, dadurch gekennzeichnet, dass die Verzögerungs-Einrichtung ein Pleuel (20) aufweist, das gleitend montiert ist auf dem Deckel (2) und quer zwischen dem Bolzen (6) und dem Schließstift (5) angeordnet ist.
  11. Schalter gemäß Anspruch 10, dadurch gekennzeichnet, dass das Pleuel (20) elastisch von einer Feder (21) beaufschlagt und an seinem äußeren Ende mit einem Betätigungsknopf (22) versehen ist, wobei das Pleuel einen inneren Endabschnitt (23) aufweist, der zwei geneigte Flächen (24, 25) bildet, die gegenseitig versetzt sind und jeweils mit dem Bolzen (6) und dem Schließstift (5) zusammen wirken, um ihre jeweiligen translatorischen Bewegungen zu fördern.
  12. Schalter gemäß Anspruch 10, dadurch gekennzeichnet, dass der mittlere Abschnitt des Pleuels (20) eine Zahnstange (26) aufweist, die in ein Verzögerungszahnrad (27) eingreift, das innerhalb des Deckels angeordnet ist und ein vorbestimmtes Übersetzungsverhältnis hat.
  13. Schalter gemäß Anspruch 1, dadurch gekennzeichnet, dass eine nicht trennbare Rückhalte-Einrichtung (28) vorgesehen ist, die ausgestaltet ist, das Pleuel (20) elastisch zurück gezogen zu halten in Richtung auf die Innenseite des Deckels (2).
  14. Schalter gemäß einem oder mehrerer der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Deckel (2) einen im wesentlichen kastenartigen Hauptkörper (14) aufweist, der verbunden ist mit einem lösbaren und ausrichtbaren Kopf (15), in dem der Schlitz (7) vorgesehen ist für den Durchlaß des Sicherheitsschlüssels (4).
EP97119512A 1996-12-19 1997-11-07 Zeitgesteuerter elektromechanischer Sicherheitsschalter Expired - Lifetime EP0849750B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI960215 1996-12-19
IT96VI000215A IT1294007B1 (it) 1996-12-19 1996-12-19 Interruttore elettromeccanico di sicurezza temporizzato

Publications (3)

Publication Number Publication Date
EP0849750A2 EP0849750A2 (de) 1998-06-24
EP0849750A3 EP0849750A3 (de) 1999-03-17
EP0849750B1 true EP0849750B1 (de) 2002-03-06

Family

ID=11426214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97119512A Expired - Lifetime EP0849750B1 (de) 1996-12-19 1997-11-07 Zeitgesteuerter elektromechanischer Sicherheitsschalter

Country Status (4)

Country Link
EP (1) EP0849750B1 (de)
AT (1) ATE214198T1 (de)
DE (1) DE69710858T2 (de)
IT (1) IT1294007B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102160507B1 (ko) 2013-12-06 2020-10-15 피자토 일렉트리카 에스.알.엘. 시간 지연형 수동 안전 스위치

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVI20130290A1 (it) * 2013-12-06 2015-06-07 Pizzato Elettrica Srl Interruttore di sicurezza ad azionamento elettronico
DE102019201019A1 (de) * 2019-01-28 2020-07-30 Robert Bosch Gmbh Trennschaltervorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613121B1 (fr) * 1987-03-27 1993-12-10 Telemecanique Electrique Interrupteur a cle verrouillable par actionneur
DE3923663A1 (de) * 1989-07-18 1991-01-24 Kronenberg Gmbh H & J Sicherheitsschalter mit ausloesbarer sperre
KR100271225B1 (ko) * 1992-08-31 2000-11-01 후나키 토시유키 안전스위치장치
DE4328297C1 (de) * 1993-08-23 1995-02-23 Euchner & Co Sicherheitsschalter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102160507B1 (ko) 2013-12-06 2020-10-15 피자토 일렉트리카 에스.알.엘. 시간 지연형 수동 안전 스위치

Also Published As

Publication number Publication date
EP0849750A2 (de) 1998-06-24
DE69710858T2 (de) 2002-11-14
ATE214198T1 (de) 2002-03-15
EP0849750A3 (de) 1999-03-17
DE69710858D1 (de) 2002-04-11
ITVI960215A1 (it) 1997-03-19
IT1294007B1 (it) 1999-03-15

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