EP0561314B1 - Security switch - Google Patents

Security switch Download PDF

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Publication number
EP0561314B1
EP0561314B1 EP19930104127 EP93104127A EP0561314B1 EP 0561314 B1 EP0561314 B1 EP 0561314B1 EP 19930104127 EP19930104127 EP 19930104127 EP 93104127 A EP93104127 A EP 93104127A EP 0561314 B1 EP0561314 B1 EP 0561314B1
Authority
EP
European Patent Office
Prior art keywords
housing
holder
safety switch
switch according
sealing lips
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
EP19930104127
Other languages
German (de)
French (fr)
Other versions
EP0561314A1 (en
Inventor
Siegfried Schulz
Klaus Schulze
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.)
KA Schmersal GmbH and Co KG
Original Assignee
KA Schmersal GmbH and Co KG
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 KA Schmersal GmbH and Co KG filed Critical KA Schmersal GmbH and Co KG
Publication of EP0561314A1 publication Critical patent/EP0561314A1/en
Application granted granted Critical
Publication of EP0561314B1 publication Critical patent/EP0561314B1/en
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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings

Definitions

  • the invention relates to a safety switch according to the preamble of claim 1.
  • Such a safety switch or the like, in particular for protective covers. is used for personal protection is known for example from DE-PS 31 00 862.
  • This has a housing in which the closing and opening of the contact by the like on the protective cover. attached actuator is effected.
  • the latter actuates a switching drum, which is rotated from its rest position by the actuating member and thereby causes the contact to close and open.
  • the shift drum can be rotated in both directions.
  • insertion slots for the actuating member are provided on at least two sides of the housing, one of which is used depending on the structural conditions.
  • a light ignition switch for motor vehicles is known, with a lock cylinder and a cap pushed onto the lock cylinder for protection against rainwater and dust.
  • the cap has a recess which is closed by two lips.
  • the object of the invention is to provide a safety switch according to the preamble of claim 1, the insertion slot is protected against the ingress of particles, such as dusty or chip-like material, but the actuation is practically not affected by the actuator.
  • Fig. 1 shows a section of a safety switch in section.
  • FIG. 2 shows a rear view (cut in half) of a protective cover of the safety switch from FIG. 1.
  • FIG. 3 shows a section along the line IIII-III of FIG. 2.
  • the safety switch shown comprises a schematically indicated housing 1 and an actuator 2, which has a holder 3, with which it or the like on a protective cover. can be fastened by means of screws, so that when opening or closing or when removing or attaching the protective cover or the like.
  • the actuator 2 actuates the contacts of the safety switch located in the housing 1, i.e. opens or closes depending on the type of switch.
  • the actuator 2 is a flat "key" and in the illustrated embodiment comprises two substantially rectangular, frame-shaped sections 5 separated by a central slot 4, which are connected to a common base and carry two unlocking extensions 6 adjacent to the slot 4 to one in Unlock and actuate housing 1 located shift drum.
  • the housing 1 has at least one insertion slot 7 for the actuating member 2.
  • the insertion slot 7 required for inserting the actuating member 2 is covered by a slot cover 8 which comprises a holder 9 fastened to the housing 1 and having a passage opening 10 for the actuating member 2.
  • the passage opening 10 in the holder 9 is practically as long as the insertion slot 7, but wider than this.
  • the passage opening 10 is made of two elastic, from the holder 9th sealed sealing lips 11 closed.
  • the holder 9 has two dowel-like extensions 12 adjacent to its two opposite narrow sides, which are inserted into corresponding openings 13 in the housing 1, are provided with a receiving bore 14 tapering towards the free end for a screw (not shown) and are cross-slotted in their end regions . By screwing in screws, the extensions 12 are spread at the ends and thus the holder 9 is attached to the housing 1.
  • the invention provides for the sealing lips 11 to be formed on two separate shaped bodies 15, since this increases the sealing effect.
  • the extensions 12 also serve as holding pins for two molded bodies 15 made of sealing material, in particular silicone rubber, on each of which a sealing lip 11 is formed.
  • the two identically shaped bodies 15 are received by the holder 9 and each have an overlap area 17 with a through opening 16 for the respective extension 12 at both ends.
  • the shaped bodies 15 are approximately half the thickness, i.e. reduced to about half the depth of the distance between the inside of the front wall of the holder 9 and the outside of the housing 1 on which the holder 9 is arranged, the overlap region 17 on one side being offset by half the thickness from that on the other side .
  • the two identical moldings 15 can be pressed against one another with the two sealing lips 11, i.e. rotated by 180 ° against each other, are arranged in the holder 9 on the extensions 12 held by friction, wherein they are supported on the housing 1 and thus also serve as a seal for the gap between the holder 9 and the housing 1.
  • the sealing lips 11 are expediently reinforced in a bead-like manner on the lip edge in order to better withstand the stresses caused by the actuating member 2, but to have sufficient flexibility when inserting and removing the actuating member 2.
  • the sealing lips 11 can be easily replaced if this should be necessary due to wear occurring during operation, in that, in the exemplary embodiment shown, the holder 9 is detached from the housing 1 and the moldings 15 are replaced by new ones, after which the holder 9 is reattached to the housing 1 becomes.

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

Description

Die Erfindung betrifft einen Sicherheitsschalter nach dem Oberbegriff des Anspruchs 1.The invention relates to a safety switch according to the preamble of claim 1.

Ein derartiger Sicherheitsschalter, wie er insbesondere für Schutzabdeckungen o.dgl. für den Personenschutz verwendet wird, ist beispielsweise aus der DE-PS 31 00 862 bekannt. Dieser weist ein Gehäuse auf, bei dem das Schließen und Öffnen des Kontaktes durch einen an der Schutzabdeckung o.dgl. angebrachtes Betätigungsorgan bewirkt wird. Letzteres betätigt eine Schaltwalze, die durch das Betätigungsorgan aus ihrer Ruhestellung gedreht wird und hierdurch das Schließen und Öffnen des Kontaktes bewirkt. Die Schaltwalze ist hierbei in beide Richtungen drehbar. Dementsprechend sind auf mindestens zwei Seiten des Gehäuses Einführschlitze für das Betätigungsorgan vorgesehen, von denen einer je nach den baulichen Gegebenheiten benutzt wird. Bei der Verwendung derartiger Sicherheitsschalter in einer durch umherfliegende staub- oder spanförmige Teilchen wie Sägemehl o.dgl. belasteten Umgebung besteht jedoch die Gefahr, daß diese Teilchen durch den oder die Einführschlitze in das Gehäuse eindringen und dort Störungen verursachen bzw. die Einführschlitze zusetzen. Bei mehreren Einführschlitzen kann man zwar die nicht benötigten durch entsprechende Einsätze verschließen, jedoch bleibt der für das Betätigungsorgan benötigte offen und damit die Gefährdung bestehen.Such a safety switch or the like, in particular for protective covers. is used for personal protection is known for example from DE-PS 31 00 862. This has a housing in which the closing and opening of the contact by the like on the protective cover. attached actuator is effected. The latter actuates a switching drum, which is rotated from its rest position by the actuating member and thereby causes the contact to close and open. The shift drum can be rotated in both directions. Accordingly, insertion slots for the actuating member are provided on at least two sides of the housing, one of which is used depending on the structural conditions. When using such safety switches in a by flying dust or chip-like particles such as sawdust or the like. contaminated environment, however, there is a risk that these particles penetrate through the insertion slot or slots into the housing and cause interference there or clog the insertion slots. If there are several insertion slots, the unneeded ones can be closed off by appropriate inserts, but the one required for the actuating member remains open and the risk remains.

Aus der DE-U-6 803 835 ist ein Lichtzündschalter für Kraftfahrzeuge bekannt, mit einem Schließzylinder und einer auf den Schließzylinder aufgeschobenen Kappe zum Schutz gegen Regenwasser und Staub. Die Kappe weist eine Aussparung auf, die durch zwei Lippen verschlossen ist.From DE-U-6 803 835 a light ignition switch for motor vehicles is known, with a lock cylinder and a cap pushed onto the lock cylinder for protection against rainwater and dust. The cap has a recess which is closed by two lips.

Aufgabe der Erfindung ist es, einen Sicherheitsschalter nach dem Oberbegriff des Anspruchs 1 zu schaffen, dessen Einführschlitz gegen ein Eindringen von Teilchen, etwa von staub- oder spanartigem Material, geschützt ist, wobei jedoch die Betätigung durch das Betätigungsorgan praktisch nicht beeinträchtigt wird.The object of the invention is to provide a safety switch according to the preamble of claim 1, the insertion slot is protected against the ingress of particles, such as dusty or chip-like material, but the actuation is practically not affected by the actuator.

Diese Aufgabe wird entsprechend dem kennzeichnenden Teil des Anspruchs 1 gelöst.This object is achieved in accordance with the characterizing part of claim 1.

Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further refinements of the invention can be found in the following description and the subclaims.

Die Erfindung wird nachstehend anhand eines in den beigefügten Abbildungen dargestellten Ausführungsbeispiels näher erläutert.The invention is explained below with reference to an embodiment shown in the accompanying figures.

Fig. 1 zeigt ausschnittweise einen Sicherheitsschalter im Schnitt.Fig. 1 shows a section of a safety switch in section.

Fig. 2 zeigt eine rückseitige Ansicht (hälftig geschnitten) auf eine Schutzabdeckung des Sicherheitsschalters von Fig. 1.FIG. 2 shows a rear view (cut in half) of a protective cover of the safety switch from FIG. 1.

Fig. 3 zeigt einen Schnitt längs der Linie IIII-III von Fig. 2.FIG. 3 shows a section along the line IIII-III of FIG. 2.

Der dargestellte Sicherheitsschalter umfaßt ein schematisch angedeutetes Gehäuse 1 und ein Betätigungsorgan 2, das eine Halterung 3 aufweist, mit der es an einer Schutzabdeckung o.dgl. mittels Schrauben befestigt werden kann, so daß beim Öffnen bzw. Schließen oder beim Abnehmen bzw. Anbringen der Schutzabdeckung o.dgl. das Betätigungsorgan 2 den oder die im Gehäuse 1 befindlichen Kontakte des Sicherheitsschalters betätigt, d.h. je nach Schalterart öffnet oder schließt.The safety switch shown comprises a schematically indicated housing 1 and an actuator 2, which has a holder 3, with which it or the like on a protective cover. can be fastened by means of screws, so that when opening or closing or when removing or attaching the protective cover or the like. the actuator 2 actuates the contacts of the safety switch located in the housing 1, i.e. opens or closes depending on the type of switch.

Das Betätigungsorgan 2 ist ein flacher "Schlüssel" und umfaßt beim dargestellten Ausführungsbeispiel zwei durch einen mittleren Schlitz 4 getrennte, im wesentlichen rechteckige, rahmenförmige Abschnitte 5, die mit einer gemeinsamen Basis verbunden sind und zwei Entriegelungsfortsätze 6 benachbart zum Schlitz 4 tragen, um eine im Gehäuse 1 befindliche Schaltwalze entriegeln und betätigen zu können.The actuator 2 is a flat "key" and in the illustrated embodiment comprises two substantially rectangular, frame-shaped sections 5 separated by a central slot 4, which are connected to a common base and carry two unlocking extensions 6 adjacent to the slot 4 to one in Unlock and actuate housing 1 located shift drum.

Das Gehäuse 1 besitzt mindestens einen Einführschlitz 7 für das Betätigungsorgan 2. Der zum Einführen des Betätigungsorgans 2 benötigte Einführschlitz 7 ist durch eine Schlitzabdeckung 8 abgedeckt, die einen am Gehäuse 1 befestigten Halter 9 umfaßt, der eine Durchtrittsöffnung 10 für das Betätigungsorgan 2 aufweist. Die Durchtrittsöffnung 10 im Halter 9 ist praktisch so lang wie der Einführschlitz 7, jedoch breiter als dieser. Die Durchtrittsöffnung 10 wird von zwei elastischen, vom Halter 9 aufgenommenen Dichtlippen 11 verschlossen.The housing 1 has at least one insertion slot 7 for the actuating member 2. The insertion slot 7 required for inserting the actuating member 2 is covered by a slot cover 8 which comprises a holder 9 fastened to the housing 1 and having a passage opening 10 for the actuating member 2. The passage opening 10 in the holder 9 is practically as long as the insertion slot 7, but wider than this. The passage opening 10 is made of two elastic, from the holder 9th sealed sealing lips 11 closed.

Der Halter 9 besitzt benachbart zu seinen zwei gegenüberliegenden Schmalseiten zwei dübelartige Fortsätze 12, die in entsprechende Öffnungen 13 im Gehäuse 1 eingesetzt, mit einer sich zum freien Ende hin verjüngenden Aufnahmebohrung 14 für eine (nicht dargestellte) Schraube versehen und in ihren Endbereichen kreuzartig geschlitzt sind. Durch Einschrauben von Schrauben werden die Fortsätze 12 endseitig gespreizt und damit der Halter 9 am Gehäuse 1 befestigt.The holder 9 has two dowel-like extensions 12 adjacent to its two opposite narrow sides, which are inserted into corresponding openings 13 in the housing 1, are provided with a receiving bore 14 tapering towards the free end for a screw (not shown) and are cross-slotted in their end regions . By screwing in screws, the extensions 12 are spread at the ends and thus the holder 9 is attached to the housing 1.

Statt die Dichtlippen 11 an einem einstückigen Einsatz aus Dichtungsmaterial auszubilden, der mit einem Einschnitt versehen ist, so daß die beiden Dichtlippen 11 ausgebildet werden, ist bei der Erfindung eine Ausbildung der Dichtlippen 11 an zwei getrennten Formkörpern 15 vorgesehen, da dies die Dichtwirkung erhöht.Instead of forming the sealing lips 11 on a one-piece insert made of sealing material which is provided with an incision so that the two sealing lips 11 are formed, the invention provides for the sealing lips 11 to be formed on two separate shaped bodies 15, since this increases the sealing effect.

Die Fortsätze 12 dienen gleichzeitig als Haltezapfen für zwei Formkörper 15 aus Dichtungsmaterial, insbesondere Silikongummi, an denen jeweils eine Dichtlippe 11 ausgebildet ist. Die beiden identisch ausgebildeten Formkörper 15 werden von dem Halter 9 aufgenommen und besitzen an beiden Enden jeweils einen mit einer Durchtrittsöffnung 16 für den jeweiligen Fortsatz 12 versehenen überlappungsbereich 17. Im überlappungsbereich 17 sind die Formkörper 15 etwa auf halbe Stärke, d.h. etwa auf halbe Tiefe des Abstandes zwischen der Innenseite der Frontwand des Halters 9 und der Außenseite des Gehäuses 1, auf der der Halter 9 angeordnet ist, reduziert, wobei der überlappungsbereich 17 an einer Seite gegenüber demjenigen an der anderen Seite um die halbe Stärke versetzt ist. Hierdurch können die beiden identischen Formkörper 15 mit den beiden Dichtlippen 11 dichtend aneinandergedrückt, d.h. um 180° gegeneinander verdreht, in dem Halter 9 auf den Fortsätzen 12 durch Reibschluß gehalten angeordnet werden, wobei sie sich auf dem Gehäuse 1 abstützen und somit zugleich als Dichtung für den Spalt zwischen Halter 9 und Gehäuse 1 dienen.The extensions 12 also serve as holding pins for two molded bodies 15 made of sealing material, in particular silicone rubber, on each of which a sealing lip 11 is formed. The two identically shaped bodies 15 are received by the holder 9 and each have an overlap area 17 with a through opening 16 for the respective extension 12 at both ends. In the overlap area 17, the shaped bodies 15 are approximately half the thickness, i.e. reduced to about half the depth of the distance between the inside of the front wall of the holder 9 and the outside of the housing 1 on which the holder 9 is arranged, the overlap region 17 on one side being offset by half the thickness from that on the other side . As a result, the two identical moldings 15 can be pressed against one another with the two sealing lips 11, i.e. rotated by 180 ° against each other, are arranged in the holder 9 on the extensions 12 held by friction, wherein they are supported on the housing 1 and thus also serve as a seal for the gap between the holder 9 and the housing 1.

Die Dichtlippen 11 sind zweckmäßigerweise am Lippenrand etwa wulstartig verstärkt, um den Beanspruchungen durch das Betätigungsorgan 2 besser standzuhalten, aber genügend Flexibilität bei Einführen und Herausziehen des Betätigungsorgans 2 zu besitzen.The sealing lips 11 are expediently reinforced in a bead-like manner on the lip edge in order to better withstand the stresses caused by the actuating member 2, but to have sufficient flexibility when inserting and removing the actuating member 2.

Beim Einschieben des Betätigungsorgans 2 gelangt schließlich dessen Basis benachbart zur Halterung 3 mit den Dichtlippen 11 in Eingriff, die auf diese Weise das Innere des Gehäuses 1 und den Einführschlitz 7 gegen das Eindringen und Verstopfen von staub- oder spanartigem Material schützen und beim Einschieben eventuell auf dem Betätigungsorgan 2 befindliche Verunreinigungen abstreifen.When the actuator 2 is inserted, its base finally engages with the sealing lips 11 adjacent to the holder 3, which in this way protect the interior of the housing 1 and the insertion slot 7 against the ingress and clogging of dusty or chip-like material and, when inserted, wipe off any impurities present on the actuating member 2.

Die Dichtlippen 11 lassen sich einfach auswechseln, wenn dies aufgrund eines beim Betrieb auftretenden Verschleißes notwendig sein sollte, indem beim dargestellten Ausführungsbeispiel der Halter 9 vom Gehäuse 1 gelöst und die Formkörper 15 durch neue ersetzt werden, wonach der Halter 9 wieder auf dem Gehäuse 1 befestigt wird.The sealing lips 11 can be easily replaced if this should be necessary due to wear occurring during operation, in that, in the exemplary embodiment shown, the holder 9 is detached from the housing 1 and the moldings 15 are replaced by new ones, after which the holder 9 is reattached to the housing 1 becomes.

Claims (8)

  1. A safety switch with a housing (1) having at least one insertion slot (7) for an actuating member (2), characterised in that a slot cover (8) is provided which comprises a holder (9) which is fastened to the housing (1) and which has an opening (10) for the actuating member (2), said opening (10) being sealed by two resilient sealing lips (11) accommodated by the holder (9), wherein each sealing lip (11) is formed from sealing material on a moulded portion (15) retained in the holder (9), the moulded portions (15) being identical.
  2. A safety switch according to Claim 1, characterised in that the holder (9) is releasably fastened to the housing (1).
  3. A safety switch according to Claim 1 or 2, characterised in that the holder (9) has dowel-like extensions (12) which are inserted in associated openings (13) of the housing (1) and which are expanded at their ends by screwed-in screws.
  4. A safety switch according to any one of Claims 1 to 3, characterised in that on either side the moulded portions (15) each have an opening (16) to be fitted on to a retaining peg (12) and in the overlapping region (17) of the retaining pegs (12) they are reduced approximately to half thickness, wherein on one side the overlapping region (17) is offset in relation to that on the other side by approximately half the thickness.
  5. A safety switch according to Claims 4, characterised in that at the same time the retaining pegs (12) take the form of extensions for fastening the holder (9) to the housing (1).
  6. A safety switch according to any one of Claims 1 to 5, characterised in that the moulded portions (15) bear against the outside of the housing (1) so as to provide a seal.
  7. A safety switch according to any one of Claims 1 to 6, characterised in that the sealing lips (11) are reinforced at the lip edge.
  8. A safety switch according to any one of Claims 1 to 7, characterised in that the sealing lips (11) consist of silicone rubber.
EP19930104127 1992-03-20 1993-03-13 Security switch Expired - Lifetime EP0561314B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4209086 1992-03-20
DE19924209086 DE4209086C1 (en) 1992-03-20 1992-03-20

Publications (2)

Publication Number Publication Date
EP0561314A1 EP0561314A1 (en) 1993-09-22
EP0561314B1 true EP0561314B1 (en) 1995-10-18

Family

ID=6454619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930104127 Expired - Lifetime EP0561314B1 (en) 1992-03-20 1993-03-13 Security switch

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EP (1) EP0561314B1 (en)
DE (1) DE4209086C1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29504673U1 (en) * 1995-03-18 1996-07-11 Klöckner-Moeller GmbH, 53115 Bonn Movement-flexible actuator for safety position switches
DE102009053717B4 (en) 2009-11-18 2016-05-04 K.A. Schmersal Holding Gmbh & Co. Kg Arrangement with a safety switch or safety lock and a mechanical actuator

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625035A (en) * 1968-10-25 1971-12-07 Bosch Gmbh Robert Lock construction
DE6803835U (en) * 1968-10-25 1969-07-10 R Bosch Gmbh ELECTRIC SWITCHES, IN PARTICULAR LIGHT SWITCHES FOR MOTOR VEHICLES
DE3100862C2 (en) * 1981-01-14 1984-02-09 K.A. Schmersal Gmbh & Co, 5600 Wuppertal Safety switch
DE3442949A1 (en) * 1984-11-24 1986-06-05 Bayerische Motoren Werke AG, 8000 München Luggage carrier for a motor vehicle, especially passenger car
DE8807681U1 (en) * 1988-06-14 1988-08-18 K.A. Schmersal Gmbh & Co, 5600 Wuppertal Radius actuator for a safety switch
DE3943376C1 (en) * 1989-12-30 1991-06-20 Kloeckner-Moeller Gmbh, 5300 Bonn, De

Also Published As

Publication number Publication date
DE4209086C1 (en) 1993-05-27
EP0561314A1 (en) 1993-09-22

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