EP0117396B1 - Interrupteur de sécurité avec moyen de verrouillage contre la fermeture non autorisée - Google Patents

Interrupteur de sécurité avec moyen de verrouillage contre la fermeture non autorisée Download PDF

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Publication number
EP0117396B1
EP0117396B1 EP84100259A EP84100259A EP0117396B1 EP 0117396 B1 EP0117396 B1 EP 0117396B1 EP 84100259 A EP84100259 A EP 84100259A EP 84100259 A EP84100259 A EP 84100259A EP 0117396 B1 EP0117396 B1 EP 0117396B1
Authority
EP
European Patent Office
Prior art keywords
slot
control
switch
detent disc
housing
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
Application number
EP84100259A
Other languages
German (de)
English (en)
Other versions
EP0117396A1 (fr
Inventor
Alfred Köller
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.)
Hans and Jos Kronenberg GmbH
Original Assignee
Hans and Jos Kronenberg GmbH
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 Hans and Jos Kronenberg GmbH filed Critical Hans and Jos Kronenberg GmbH
Publication of EP0117396A1 publication Critical patent/EP0117396A1/fr
Application granted granted Critical
Publication of EP0117396B1 publication Critical patent/EP0117396B1/fr
Expired 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

Definitions

  • the invention relates to a safety switch with fail-safe protection.
  • such a safety switch comprises a switch housing with a switch enclosed by it, a plunger guided through the wall of the switch housing and a control roller articulated to the plunger via toggle levers, which is pivotably arranged on a shaft in a control housing and on their circumference has a sector-like recess into which an actuating bracket assigned to the control housing, inserted through a slot in the control housing, can engage with its front free end, which is designed as a crosspiece in front of a window, in order to twist the control roller.
  • safety switch could not be actuated by unauthorized persons with a simple aid, for example a screwdriver, but required a specially designed actuating element in the form of a claw, which, inserted into the slot in the control housing, was able to with the bent free end in to engage a recess of a control roller and to twist it so that a plunger connected to the control roller inevitably closes the contacts of an adjacent switch or, conversely, inevitably returns the roller when the actuating claw is removed and thus inevitably opens the contacts.
  • an actuating bracket which, at its front free end, had a crosspiece for pivoting the control wing of a control roller and behind it a window for receiving a deflector wing of this control roller.
  • This switch could also not be operated by simple tools, for example a screwdriver, but was also safe against operation by unauthorized persons who made an actuating claw from a correspondingly angled sheet metal strip and thus tried to operate the switch described above.
  • This safety switch can also be operated by unauthorized persons, provided they have a certain level of craftsmanship and make an operating bracket from a correspondingly strong wire, with which they can then turn the control roller and at least briefly switch on the switch. While in general the aforementioned safety switch already has increased security against tricking, the requirements for security against tricking may be screwed up even higher for certain applications. If the known safety switch described above should then no longer be considered sufficient with regard to securing against tampering, a further developed safety switch with a fail-safe device is described and claimed below, which no longer permits actuation with the aid of tools which have been produced for this in a reasonable amount of time.
  • the invention is accordingly based on the object of providing the known safety switch described above with a faulty closing device which prevents actuation by unauthorized persons with such aids which can be produced in a short time.
  • control roller is assigned at least one freely pivotable locking disk which, at its end projecting into the slot in the control housing, has a radially projecting control lug and also a cam slot for receiving the plunger of the switch with the toggle levers Axis.
  • the cam slot includes a in the starting position (rest position) of the locking disc receiving the axis and holding it before closing the contacts of the switch shorter slot part and a longer slot part connected to this by a central guide part, which receives the axis in the working position of the locking disc and allowing their further movement under the influence of the control roller until the contacts of the switch close.
  • the locking disk is pivoted from its starting position into its working position was, before the control roller is pivoted further, said axis reaches the longer slot part of the cam slot, which allows a much longer path of the axis and thus the plunger moving the contact bridge of the switch.
  • the toggle levers and the axis and thereby the plunger of the switch are moved so far that the contacts of the switch are finally closed.
  • the actuating bracket has a projection at its free end, that is to say in front of the crossbar, or, if two locking disks are provided, two projections which are arranged and dimensioned such that they engage a control lug when the actuating bracket is inserted into the slot in the control housing of the respective lock washer.
  • This control lug protrudes into the path of the actuating bracket and is acted upon by the respective projection when it is inserted, so that the locking disk is finally pivoted out of the starting position into the working position.
  • the length of the projections on the actuating bracket is of course dimensioned such that the locking disks are already pivoted into their working position before the control roller has already inserted the axis that articulates the toggle lever with the plunger of the switch into the shorter slot part of the cam slot.
  • the shorter slot part in the or each locking disk also has a short part which extends in the direction of the shaft of the control roller.
  • This configuration furthermore makes it difficult to manipulate the switch with individual rods or the like inserted through the slot. If you hit the two locking disks with one or two tools and want to swivel them in the desired direction before you pivot the actuating wing of the control roller a little from its rest position, the axis that can be moved in the slot of the or each locking disk comes into it Part of the slot and prevents further pivoting of the locking disc (s).
  • the central guide part of the cam slot in the or each locking disk is designed such that it brings about the inevitable return of the locking disk from the working position to the starting position.
  • This curve slot configuration is normally sufficient to guarantee a reliable return of the locking disk.
  • a spring means is assigned to the or each locking disk, which holds the locking disk in the starting position. Such a spring means ensures that the locking disk is reset reliably in any position of the safety switch.
  • spring means can be used as spring means for the locking disks.
  • a spring means is formed by a spring arm which is fixedly connected to the respective locking disk, protrudes approximately radially therefrom and is biased against an inner wall of the control housing.
  • the locking disk and spring arm are made in one piece from a highly elastic thermoplastic. Since the spring arm does not have to absorb large forces or have to carry out paths because only the frictional forces acting on the respective locking disk can be overcome, the spring arm can be designed in such a way that it is practically fatigue-free and has a practically unlimited service life.
  • the safety switch can not only, as described in detail above. can be switched by inserting an operating bracket into a slot in one of the two side walls of the control housing, but also through a slot which is located in the bottom wall of the control housing, that is to say in the wall facing away from the switch housing.
  • actuation can only be effected by the associated actuating bracket, but not by manipulations with other tools.
  • the safety switch 1 shown in Fig. 1 with a mishandling device comprises a switch housing 3 and a control housing 4 connected to it.
  • a switch housing 3 In the front wall 12a of the control housing 4 there is a rectangular slot 13 through which an associated actuating bracket 2 can be inserted.
  • This operating bracket has a crossbar 14 at the front end and a window 15 behind it.
  • a base plate 16 At the rear end of the operating bracket 2 there is a base plate 16 with holes 17, by means of which the operating bracket can be attached to a door, a movable machine part or the like.
  • control housing 4 Details of the control housing 4 can be seen from FIGS. 2 and 3. As can be seen in particular from FIG. 3, a control roller 8 is pivotally arranged in this housing on a shaft 6, which has a control wing 5 to be acted upon by the crossbar 14 of the actuating bracket 2, a sector-like recess 28 and a deflector wing 9. The crossbar 14 comes into the sector-like recess 28 when the actuating bracket is inserted.
  • These locks are formed by two locking disks 21 a and 21 b, the shape of which can be seen from Fig. 3a.
  • the two locking disks are arranged on both sides of the control roller 8 so that they can pivot on their shaft 6 and, in their starting position, as shown in FIG.
  • each locking disk is placed under prestress on the inside of the front wall 12a and thereby ensures that the locking disk remains in the starting position.
  • each locking disk there is a cam slot which comprises a shorter slot part 22, which extends approximately radially to the shaft 6, a longer slot part 25, also approximately radially to the shaft 6, and a central guide part 24 connecting these two slot parts.
  • the arrangement is such that when the locking disks are in their starting position, the shorter slot part 22 runs parallel with the central plane connecting the shaft 6 with the axis 19.
  • Fig. 6 the end position is shown with the operating bracket fully inserted.
  • the crossbar 14 of the actuating bracket has pivoted the control roller further and this has inserted the axis 19 into the long slot part 25; wherein the plunger 20 of the switch has reached its end position and the switch contacts (not shown) have closed.
  • Fig. 7 is shown comparatively what happens in the control part of the safety switch when not a properly designed actuating bracket, but for example a flat sheet metal piece 26 is inserted into the slot 13 of the control housing.
  • the deflector wing of the control roller in the position 9 "" and thereby prevents further advancement of the sheet metal piece 26 and thus a further Ver .. pivoting the control roller.
  • the sheet metal piece 26 has not moved the two locking disks out of their working position, so that the axis 19 has come into the short slot part and is held by it.
  • the length of the short slot part is dimensioned so that the contacts of the switch are certainly not yet closed in this position.
  • the channel located behind the slot 13 in the front wall 12a and intended for receiving the actuating bracket 2 extends through the control housing 4 and runs through the rear wall 12b thereof.
  • the safety switch can then be designed by simply repositioning the control roller 8 and the two locking disks 21a and 21b in such a way that it can be actuated from the rear wall 12b by an actuating bracket.
  • the arrangement of the moving parts inside the control housing 4 and their movements when actuated by the actuating bracket are mirror images of those described above with reference to the exemplary embodiment shown.
  • FIG. 8 shows a modified locking disk 121 with spring arm 123 and control lug 127 and with slot parts 122, 124, 125.
  • the cam slot of this embodiment comprises, in addition to the locking disk shown in FIG. 3a, a further short slot part 128, opposite the slot part 122, which further increases the security against manipulation in the manner described below.
  • FIG. 9 shows an embodiment of the control housing in which the slot 130, which is provided for receiving the actuating bracket 102, is located in the bottom of the control housing, that is to say in the wall 111 facing away from the switch housing.
  • the control roller 108 is here shaped and used that its actuating wing 109 is acted upon by the front transverse web 114 when inserting the actuating bracket 102.
  • the two projections 110 which are also arranged on both sides of the crossbar 114 in this embodiment and protrude in the direction of insertion over this crossbar, meet the control lug 127 of each locking disk 121, as shown in dashed lines in FIG to rotate the spring clip 123 clockwise and thus guide the axis 119 via the slot part 124 of the cam slot into the longer slot part 125 of the slot.
  • this is only possible if the axis 119 is first lifted out of the short slot part 128. This can only happen if the crossbar 114 first pivots the control roller 108 somewhat clockwise. Then the axis 119 is moved out of the short slot part 128 via the toggle lever 107.
  • the deflector wing 105 of the control roller 108 can enter this window and the movement can continue until the axis 119 finally over the (not shown in Fig. 9) plunger Switch in the switch housing. use 3 (see Fig. 1).
  • the control housing according to FIG. 9 can be used as desired for actuation from the left or from the right or, as shown in FIG. 9, from below, in which case one or the other slot is used in each case.
  • the slots are expediently closed by break-out parts. One can then break out one or the other part as desired and use the housing for such a type of actuation.
  • the locking disks and the control roller must then be shaped and used accordingly.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Mechanisms For Operating Contacts (AREA)

Claims (8)

1. Interrupteur de sécurité avec protection contre la fermeture accidentelle, comprenant un boîtier d'interrupteur (3) renfermant un interrupteur, un poussoir (20) guidé à travers la paroi du boîtier d'interrupteur et un cylindre de commande (8 ; 108) raccordé de façon articulée au poussoir par l'intermédiaire d'un levier à genouillère (7 ; 107), cylindre qui est monté pivotant sur un arbre (6 ; 106) dans un boîtier de commande (4) et qui présente à sa périphérie un creux en forme de secteur (28) dans lequel un étrier de manoeuvre (2 ; 102), associé au boîtier de commande et guidé par une fente (13 ; 130) dans le boîtier de commande (4), peut s'engager par son extrémité libre antérieure, réalisée sous forme de barre transversale (14 ; 114) en avant d'une fenêtre (15), pour faire tourner le cylindre de commande, caractérisé en ce qu'il est associé, au cylindre de commande (8 ; 108), au moins une plaque d'arrêt (21 : 121) montée de manière à pivoter librement, qui présente, à son extrémité qui pénètre dans la fente (13 ; 130) du boîtier de commande (4), un ergot de commande (27; 127) faisant saillie radialement et, en outre, une fente courbe (22, 24, 25 ; 122, 124, 125, 128) destinée à recevoir un axe (19 ; 119) qui relie de façon articulée le poussoir (20) de l'interrupteur au levier à genouillère (7 ; 107), la fente courbe comprenant un segment de fente plus court (22 ; 122) qui, dans la position initiale de la plaque d'arrêt (21 ; 121), reçoit l'axe (19 ; 119) et le retient contre la fermeture des contacts de l'interrupteur et un segment de fente plus long (25 ; 125) qui est relié au premier segment par un segment moyen de guidage (24 ; 124) et qui, dans la position de travail de la plaque d'arrêt (21 ; 121), reçoit l'axe (19 ; 119) et permet la poursuite du mouvement de celui-ci, avec actionnement du cylindre de commande (8 ; 108) jusqu'à la fermeture des contacts de l'interrupteur, et l'étrier de manoeuvre (2; 102) présentant, à son extrémité libre, une saillie (10 ; 110) associée à la plaque d'arrêt (21 ; 121), saillie qui, lors de l'introduction de l'étrier de manoeuvre (2 ; 102) dans la fente (13 ; 130) du boîtier de commande (4), entre en contact avec l'ergot de commande (27; 127) de la plaque d'arrêt associée (21 ; 121) et, tandis que cette introduction se poursuit, fait pivoter la plaque d'arrêt de sa position initiale jusqu'à sa position de travail.
2. Interrupteur de sécurité selon la revendication 1, caractérisé en ce qu'il est prévu deux plaques d'arrêt (21a, 21 b).
3. Interrupteur de sécurité selon la revendication 1 ou 2, caractérisé en ce que le segment moyen de guidage (24; 124) de la fente courbe (22, 24, 25 ; 122, 124, 125, 128) dans la plaque ou dans chaque plaque d'arrêt est réalisé de telle manière qu'il provoque le retour forcé de la plaque d'arrêt dans sa position initiale à partir de sa position de travail.
4. Interrupteur de sécurité selon la revendication 3, caractérisé en ce que le segment de fente plus court (122) dans la plaque ou dans chaque plaque d'arrêt (121) présente également une courte partie (128) qui s'étend en direction de l'arbre (106) du cylindre de commande (108).
5. Interrupteur de sécurité selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il est associé, à la plaque ou à chaque plaque d'arrêt (21 ; 121), des moyens à ressort qui maintiennent la plaque d'arrêt dans sa position initiale.
6. Interrupteur de sécurité selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les moyens à ressort associés à la plaque ou à chaque plaque d'arrêt (21 ; 121) sont constitués par un bras de ressort (23 ; 123) qui est fixé rigidement à la plaque d'arrêt, fait saillie à peu près radialement sur celle-ci et s'applique avec pré-tension contre la face interne de la paroi (12 : 111) du boîtier de commande (4) qui comporte la fente (13 ; 130).
7. Interrupteur de sécurité selon la revendication 6, caractérisé en ce que la ou les plaques d'arrêt (21 ; 121) est (sont) fabriquée(s) d'une seule pièce avec le bras de ressort (23 : 123) en une matière synthétique thermoplastique à forte élasticité.
8. Interrupteur de sécurité selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la fente (130) destinée à recevoir l'étrier de manoeuvre (102) se trouve dans la paroi (111) du boîtier de commande (4) qui est à l'opposé du boîtier d'interrupteur (3).
EP84100259A 1983-01-27 1984-01-12 Interrupteur de sécurité avec moyen de verrouillage contre la fermeture non autorisée Expired EP0117396B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3302631A DE3302631C2 (de) 1983-01-27 1983-01-27 Sicherheitsschalter mit Fehlschließsicherung
DE3302631 1983-01-27

Publications (2)

Publication Number Publication Date
EP0117396A1 EP0117396A1 (fr) 1984-09-05
EP0117396B1 true EP0117396B1 (fr) 1986-08-20

Family

ID=6189309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100259A Expired EP0117396B1 (fr) 1983-01-27 1984-01-12 Interrupteur de sécurité avec moyen de verrouillage contre la fermeture non autorisée

Country Status (2)

Country Link
EP (1) EP0117396B1 (fr)
DE (2) DE3302631C2 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3322292C2 (de) * 1983-06-21 1986-03-27 Hans & Jos. Kronenberg Gmbh, 5060 Bergisch Gladbach Sicherheitsschalter mit Fehlschließsicherung
DE3433048C2 (de) * 1984-09-08 1986-10-02 K.A. Schmersal Gmbh & Co, 5600 Wuppertal Elektrischer Schalter
FR2579010B1 (fr) * 1985-03-18 1987-04-10 Telemecanique Electrique Interrupteur electrique de securite
DE3819753A1 (de) * 1988-06-10 1989-12-14 Kronenberg Gmbh H & J Sicherheitsschalter
US4963706A (en) * 1989-01-12 1990-10-16 Eja Engineering Company Limited Safety switch assemblies
FR2655182B1 (fr) * 1989-11-27 1992-02-21 Telemecanique Systeme interrupteur de securite fonctionnant par insertion et extraction d'une cle.
FR2655184B1 (fr) * 1989-11-27 1992-02-21 Telemecanique Systeme interrupteur de securite fonctionnant par insertion et extraction d'une cle.
DE3943376C1 (fr) * 1989-12-30 1991-06-20 Kloeckner-Moeller Gmbh, 5300 Bonn, De
DE4029344A1 (de) * 1990-09-15 1991-02-14 Kronenberg Gmbh H & J Sicherheitsschalter mit fehlschliesssicherung
DE4031348A1 (de) * 1990-10-04 1991-04-11 Kronenberg Gmbh H & J Sicherheitsschalter
DE4039652C1 (en) * 1990-12-12 1992-03-05 Kloeckner-Moeller Gmbh, 5300 Bonn, De Detachable safety-interlock for electrical switch - has key guides chamfered to facilitate final engagement with coded cam
AU4337493A (en) * 1992-06-02 1993-12-30 Eja Engineering Plc Safety switch assemblies
DE4238016C2 (de) * 1992-11-11 1995-12-14 Kloeckner Moeller Gmbh Vorrichtung zum Betätigen eines Positionsschalters
DE4303367C1 (de) * 1993-02-05 1994-02-24 Schmersal K A Gmbh & Co Sicherheitsschalter
DE4436579C2 (de) * 1994-10-13 1997-05-22 Bernstein Hans Spezialfabrik Sicherheitsschalter
FR2741993B1 (fr) 1995-12-05 1998-01-16 Schneider Electric Sa Interrupteur electrique de securite a cle
DE29609012U1 (de) * 1996-05-20 1996-10-24 Hans Bernstein, Spezialfabrik für Schaltkontakte GmbH & Co, 32457 Porta Westfalica Sicherheitsschalter
US6118087A (en) * 1997-03-31 2000-09-12 Idec Izumi Corporation Safety switch

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT234956B (de) * 1961-11-06 1964-08-10 Wertheim Werke Ag Sicherheitskontakteinrichtung für Aufzugstüren
DE7627192U1 (de) * 1976-08-31 1976-12-23 Hans & Jos. Kronenberg Gmbh, 5060 Bensberg Zwangskontakt-Schalteinrichtung, insbesondere für Aufzugstüren
DE3100862C2 (de) * 1981-01-14 1984-02-09 K.A. Schmersal Gmbh & Co, 5600 Wuppertal Sicherheitsschalter
DE3112097C2 (de) * 1981-03-27 1990-03-29 Euchner & Co, 7022 Leinfelden-Echterdingen "Sicherheitsschalter"
DE8120397U1 (de) * 1981-07-11 1981-10-29 Hans & Jos. Kronenberg Gmbh, 5060 Bergisch Gladbach "Sicherheitsschalter"

Also Published As

Publication number Publication date
DE3302631C2 (de) 1985-02-07
EP0117396A1 (fr) 1984-09-05
DE3302631A1 (de) 1984-08-02
DE3460481D1 (en) 1986-09-25

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