EP0117396A1 - 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
EP0117396A1
EP0117396A1 EP84100259A EP84100259A EP0117396A1 EP 0117396 A1 EP0117396 A1 EP 0117396A1 EP 84100259 A EP84100259 A EP 84100259A EP 84100259 A EP84100259 A EP 84100259A EP 0117396 A1 EP0117396 A1 EP 0117396A1
Authority
EP
European Patent Office
Prior art keywords
slot
control
switch
housing
locking
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.)
Granted
Application number
EP84100259A
Other languages
German (de)
English (en)
Other versions
EP0117396B1 (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 its 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 operated by unauthorized persons with a simple tool, for example a screwdriver, but instead required a specially designed actuator in the form of a claw, which, inserted into the slot of the control housing, was able to engage with the bent free end in a recess of a control roller and twist it so that a plunger connected to the control roller Contacts of an adjacent switch inevitably closed or, conversely, when the actuating claw was removed, the roller inevitably returned and thus inevitably opened 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 the aforementioned safety switch generally already has increased security against trickery, one likes the requirements for security against trickery may screw 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 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 the actuating wing of the control roller is pivoted somewhat from its rest position, the axis, which is displaceable in the slot of the or each locking disk, reaches this part of the slot and prevents the locking disk (s) from pivoting further.
  • 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.
  • the or each locking disk is assigned a spring means which holds the locking disk in the starting position.
  • 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 preferably 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 to be overcome, the spring arm can be designed so that it is practically fatigue-free and has a practically unlimited service life.
  • the safety switch can not only be switched, as described in detail above, 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, i.e. in the wall facing away from the switch housing , is located.
  • actuation can only be effected by the associated actuating bracket, but not by manipulations with other tools.
  • FIG. 1 includes 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, with the aid 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 cross piece 14 arrives in the sector-like recess 28 when the actuating bracket is inserted.
  • These locks are formed by two locking disks 21a and 21b, the shape of which can be seen in 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. 3, rest on the axis 19 with the left-hand limitation of their shorter slot part 22.
  • 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.
  • the projections 10a and 10b come into the position 10a ′′ or 10b ′′, in which they meet the control lugs 27 of the locking disks and thereby the locking disks in pivot their working position shown in Fig. 5.
  • the longer slot part 25 is now approximately aligned with the axis 19 and, if the control roller is subsequently pivoted further, this can enter the longer guide slot.
  • 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, the plunger 20 of the switch having reached its end position and the switch contacts (not shown) 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 comes into position 9 1111 and thereby already prevents further advancement of the tool 26 and thus further pivoting of the control roller.
  • the tool 26 has not moved the two locking disks out of their working position, so that the axis 19 has entered 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 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 cam slot 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, as shown in broken lines in FIG.
  • the deflector wing 105 of the control roller 108 can enter this window and the movement can continue so far that the axis 119 finally over the (not shown in Fig. 9) plunger Switch in switch housing 3 (see Fig. 1) actuated.
  • 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 this type of actuation.
  • the locking disks and the control roller must then be shaped and used accordingly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Mechanisms For Operating Contacts (AREA)
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 true EP0117396A1 (fr) 1984-09-05
EP0117396B1 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)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175156A2 (fr) * 1984-09-08 1986-03-26 K.A. Schmersal GmbH & Co. Interrupteur électrique
DE3819753A1 (de) * 1988-06-10 1989-12-14 Kronenberg Gmbh H & J Sicherheitsschalter
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
FR2655184A1 (fr) * 1989-11-27 1991-05-31 Telemecanique Systeme interrupteur de securite fonctionnant par insertion et extraction d'une cle.
FR2655182A1 (fr) * 1989-11-27 1991-05-31 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
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
EP0707329A1 (fr) * 1994-10-13 1996-04-17 HANS BERNSTEIN SPEZIALFABRIK FÜR SCHALTKONTAKTE GmbH & CO. Interrupteur de sécurité
DE29609012U1 (de) * 1996-05-20 1996-10-24 Hans Bernstein, Spezialfabrik für Schaltkontakte GmbH & Co, 32457 Porta Westfalica Sicherheitsschalter
EP0869524A1 (fr) * 1997-03-31 1998-10-07 Idec Izumi Corporation Interrupteur de sécurité

Families Citing this family (7)

* 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
FR2579010B1 (fr) * 1985-03-18 1987-04-10 Telemecanique Electrique Interrupteur electrique de securite
US4963706A (en) * 1989-01-12 1990-10-16 Eja Engineering Company Limited Safety switch assemblies
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
FR2741993B1 (fr) * 1995-12-05 1998-01-16 Schneider Electric Sa Interrupteur electrique de securite a cle

Citations (3)

* 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
GB2091043A (en) * 1981-01-14 1982-07-21 Schmersal K A Gmbh & Co Electrical switches
DE3112097A1 (de) * 1981-03-27 1982-10-21 Euchner & Co, 7022 Leinfelden-Echterdingen "sicherheitsschalter"

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7627192U1 (de) * 1976-08-31 1976-12-23 Hans & Jos. Kronenberg Gmbh, 5060 Bensberg Zwangskontakt-Schalteinrichtung, insbesondere für Aufzugstüren
DE8120397U1 (de) * 1981-07-11 1981-10-29 Hans & Jos. Kronenberg Gmbh, 5060 Bergisch Gladbach "Sicherheitsschalter"

Patent Citations (3)

* 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
GB2091043A (en) * 1981-01-14 1982-07-21 Schmersal K A Gmbh & Co Electrical switches
DE3112097A1 (de) * 1981-03-27 1982-10-21 Euchner & Co, 7022 Leinfelden-Echterdingen "sicherheitsschalter"

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175156A3 (en) * 1984-09-08 1987-04-22 K.A. Schmersal Gmbh & Co. Electrical switch
EP0175156A2 (fr) * 1984-09-08 1986-03-26 K.A. Schmersal GmbH & Co. Interrupteur électrique
DE3819753A1 (de) * 1988-06-10 1989-12-14 Kronenberg Gmbh H & J Sicherheitsschalter
FR2655184A1 (fr) * 1989-11-27 1991-05-31 Telemecanique Systeme interrupteur de securite fonctionnant par insertion et extraction d'une cle.
FR2655182A1 (fr) * 1989-11-27 1991-05-31 Telemecanique Systeme interrupteur de securite fonctionnant par insertion et extraction d'une cle.
WO1991010247A1 (fr) * 1989-12-30 1991-07-11 Klöckner-Moeller Gmbh Disjoncteur pour capots protecteurs ou analogues
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
EP0707329A1 (fr) * 1994-10-13 1996-04-17 HANS BERNSTEIN SPEZIALFABRIK FÜR SCHALTKONTAKTE GmbH & CO. Interrupteur de sécurité
DE4436579A1 (de) * 1994-10-13 1996-04-25 Bernstein Hans Spezialfabrik Sicherheitsschalter
DE29609012U1 (de) * 1996-05-20 1996-10-24 Hans Bernstein, Spezialfabrik für Schaltkontakte GmbH & Co, 32457 Porta Westfalica Sicherheitsschalter
EP0869524A1 (fr) * 1997-03-31 1998-10-07 Idec Izumi Corporation Interrupteur de sécurité
US6118087A (en) * 1997-03-31 2000-09-12 Idec Izumi Corporation Safety switch
US6194674B1 (en) 1997-03-31 2001-02-27 Idec Izumi Corporation Safety switch

Also Published As

Publication number Publication date
DE3302631A1 (de) 1984-08-02
DE3460481D1 (en) 1986-09-25
DE3302631C2 (de) 1985-02-07
EP0117396B1 (fr) 1986-08-20

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