EP0564798B1 - Limit switch - Google Patents

Limit switch Download PDF

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Publication number
EP0564798B1
EP0564798B1 EP93102940A EP93102940A EP0564798B1 EP 0564798 B1 EP0564798 B1 EP 0564798B1 EP 93102940 A EP93102940 A EP 93102940A EP 93102940 A EP93102940 A EP 93102940A EP 0564798 B1 EP0564798 B1 EP 0564798B1
Authority
EP
European Patent Office
Prior art keywords
cover
limit switch
optical fibre
housing
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.)
Expired - Lifetime
Application number
EP93102940A
Other languages
German (de)
French (fr)
Other versions
EP0564798A1 (en
Inventor
Rolf Dipl.-Ing. Wecke
Werner Dipl.-Ing. Winkelhake
Roland Dipl.-Ing. Mönnings
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 Bernstein Spezialfabrik fur Schaltkontakte & Co GmbH
Hans Bernstein Spezialfabrik fur Schaltkontakte and Co GmbH
Original Assignee
Hans Bernstein Spezialfabrik fur Schaltkontakte & Co GmbH
Hans Bernstein Spezialfabrik fur Schaltkontakte and Co 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 Bernstein Spezialfabrik fur Schaltkontakte & Co GmbH, Hans Bernstein Spezialfabrik fur Schaltkontakte and Co GmbH filed Critical Hans Bernstein Spezialfabrik fur Schaltkontakte & Co GmbH
Publication of EP0564798A1 publication Critical patent/EP0564798A1/en
Application granted granted Critical
Publication of EP0564798B1 publication Critical patent/EP0564798B1/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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"
    • H01H9/161—Indicators for switching condition, e.g. "on" or "off" comprising light emitting elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/22—Operating parts, e.g. handle
    • H01H21/24—Operating parts, e.g. handle biased to return to normal position upon removal of operating force
    • H01H21/28—Operating parts, e.g. handle biased to return to normal position upon removal of operating force adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H01H21/285—Operating parts, e.g. handle biased to return to normal position upon removal of operating force adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift having an operating arm actuated by the movement of the body and mounted on an axis converting its rotating movement into a rectilinear switch activating movement
    • 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 present invention relates to a limit switch with a housing closed by a cover and a switching element consisting of a lever, a plunger or the like and an optical display device for the respective switching state.
  • Such limit switches are actuated by moving parts of a machine or other devices such as elevator cabins or the like.
  • the respective switching state is then displayed via the optical display device, so that this switching state can be recognized even when the limit switch is glanced at.
  • the present invention has for its object to provide a limit switch of the generic type, which is characterized by an extremely compact, easy to install and extremely effective display device.
  • the display device consists of a light-emitting diode arranged in the housing and a light guide arranged directly above it, the light guide passing through one of the housing walls or the cover, being tightly connected to the housing wall or the cover and being lens-like in the region outside the wall or the cover.
  • a limit switch with a display device designed in this way is characterized in that the individual elements of the display device can be selected to be extremely small, are easy to assemble and that the display device is extremely effective, since the lens-like design of the light guide in the area outside the housing achieves this. that the respective changeover state can be clearly seen even with a relatively unfavorable viewing angle with respect to the outer region of the light guide.
  • the construction according to the invention has the advantage that the opening of the housing or the cover required for the arrangement of the light guide can be extremely tightly closed in a simple manner, for example by using appropriate waterproof and / or oil-tight adhesive.
  • the limit switch shown in FIGS. 1 and 2 and designated overall by the reference number 1 has a housing 2 which is closed by means of a cover 3.
  • This cover 3 is detachably fixed to the housing 2 by fastening screws 4.
  • a seal 5 is located between cover 3 and housing 2.
  • the limit switch 1 has a switching element, which in the exemplary embodiment shown consists of a lever 6 with a feeler roller 7. Instead of the lever 6 with sensing roller 7, such a limit switch can, however, also be equipped with a plunger or a differently designed switching element.
  • the limit switch 1 has a display device 8, which according to the invention consists of a light-emitting diode 9 arranged in the housing 2 and a light guide 10.
  • the light guide 10 is arranged and passes directly above the light-emitting diode 9 the cover 3 in the area of a bore 11.
  • the area 12 of the light guide 10 lying outside the cover 3 is designed like a lens and has a truncated cone-like outer contour in the exemplary embodiment shown.
  • the outer region 12 of the light guide 10 is equipped with a larger diameter than the through hole 11, so that both this through hole 11 and a countersink 13 within the cover 3, which runs concentrically to the through hole 11, is covered.
  • a waterproof and / or oil-tight adhesive is provided, which not only fixes the light guide 10 in the cover 3, but also ensures a perfect seal of the through bore 11.
  • the frustoconical outer region 12 of the light guide 10 is provided with a frustoconical recess 14 that runs coaxially to the outer contour. This design of the outer region 12 of the light guide 10 ensures that even with unfavorable viewing angles it is undoubtedly recognizable whether the light-emitting diode 9 is switched on or off.
  • the light guide 10 is advantageously made of plastic or an impact-resistant glass, so that there is no risk that the light guide 10 is destroyed by external, mechanical influences.

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Push-Button Switches (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Description

Die vorliegende Erfindung betrifft einen Grenztaster mit einem durch einen Deckel verschlossenen Gehäuse und einem aus einem Hebel, einem Stößel od. dgl. bestehenden Schaltorgan und einer optischen Anzeigeeinrichtung für den jeweiligen Schaltzustand.The present invention relates to a limit switch with a housing closed by a cover and a switching element consisting of a lever, a plunger or the like and an optical display device for the respective switching state.

Grenztaster der vorerwähnten Art sind an sich bekannt, siehe z. B. DE-A-2 254 765.Limit switches of the aforementioned type are known per se, see e.g. B. DE-A-2 254 765.

Derartige Grenztaster werden durch bewegliche Teile einer Maschine oder anderer Einrichtungen wie beispielsweise Fahrstuhlkabinen od. dgl. betätigt.Such limit switches are actuated by moving parts of a machine or other devices such as elevator cabins or the like.

Über die optische Anzeigeeinrichtung wird dann der jeweilige Schaltzustand angezeigt, so daß dieser Schaltzustand auch bei flüchtigem Betrachten des Grenztasters erkennbar ist.The respective switching state is then displayed via the optical display device, so that this switching state can be recognized even when the limit switch is glanced at.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Grenztaster der gattungsgemäßen Art zu schaffen, der sich durch eine äußerst kompakte, leicht montierbare und äußerst wirkungsvolle Anzeigeeinrichtung auszeichnet.The present invention has for its object to provide a limit switch of the generic type, which is characterized by an extremely compact, easy to install and extremely effective display device.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Anzeigeeinrichtung aus einer im Gehäuse angeordneten Leuchtdiode und einem unmittelbar darüber angeordneten Lichtleiter besteht, wobei der Lichtleiter eine der Gehäusewandungen oder den Deckel durchtritt, mit der Gehäusewandung oder dem Deckel dicht verbunden und im Bereich außerhalb der Wandung oder des Deckels linsenartig ausgebildet ist.This object is achieved in that the display device consists of a light-emitting diode arranged in the housing and a light guide arranged directly above it, the light guide passing through one of the housing walls or the cover, being tightly connected to the housing wall or the cover and being lens-like in the region outside the wall or the cover.

Ein Grenztaster mit einer derart ausgebildeten Anzeigeeinrichtung zeichnet sich dadurch aus, daß die einzelnen Elemente der Anzeigeeinrichtung äußerst klein gewählt werden können, leicht montierbar sind und daß die Anzeigevorrichtung äußerst wirkungsvoll ist, da durch die linsenartige Ausbildung des Lichtleiters im Bereich außerhalb des Gehäuses erreicht wird, daß der jeweilige Umschaltzustand auch bei einem relativ ungünstigen Betrachtungswinkel in bezug auf den außenliegenden Bereich des Lichtleiters gut erkennbar ist.A limit switch with a display device designed in this way is characterized in that the individual elements of the display device can be selected to be extremely small, are easy to assemble and that the display device is extremely effective, since the lens-like design of the light guide in the area outside the housing achieves this. that the respective changeover state can be clearly seen even with a relatively unfavorable viewing angle with respect to the outer region of the light guide.

Außerdem bringt die erfindungsgemäße Konstruktion den Vorteil mit sich, daß die für die Anordnung des Lichtleiters erforderliche Durchbrechung des Gehäuses oder des Deckels auf einfache Art und Weise äußerst dicht verschlossen werden kann, beispielsweise durch die Verwendung entsprechender wasserdichter und/oder öldichter Kleber.In addition, the construction according to the invention has the advantage that the opening of the housing or the cover required for the arrangement of the light guide can be extremely tightly closed in a simple manner, for example by using appropriate waterproof and / or oil-tight adhesive.

Weitere Merkmale der Erfindung sind Gegenstand von Unteransprüchen.Further features of the invention are the subject of dependent claims.

Ein Ausführungsbeispiel der Erfindung ist in den beigefügten Zeichnungen dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is illustrated in the accompanying drawings and will be described in more detail below.

Es zeigen:

Figur 1
einen Längsschnitt durch einen erfindungsgemäßen Grenztaster,
Figur 2
eine Ansicht in Richtung des Pfeiles II in Figur 1 unter Weglassung eines in Figur 1 gezeigten Deckels.
Show it:
Figure 1
2 shows a longitudinal section through a limit switch according to the invention,
Figure 2
a view in the direction of arrow II in Figure 1 with the omission of a cover shown in Figure 1.

Der in den Figuren 1 und 2 dargestellte und insgesamt mit dem Bezugszeichen 1 bezeichnete Grenztaster weist ein Gehäuse 2 auf, welches mittels eines Deckels 3 verschlossen ist.The limit switch shown in FIGS. 1 and 2 and designated overall by the reference number 1 has a housing 2 which is closed by means of a cover 3.

Dieser Deckel 3 ist durch Befestigungsschrauben 4 lösbar am Gehäuse 2 festgelegt. Zwischen Deckel 3 und Gehäuse 2 befindet sich eine Dichtung 5.This cover 3 is detachably fixed to the housing 2 by fastening screws 4. A seal 5 is located between cover 3 and housing 2.

Der Grenztaster 1 weist ein Schaltorgan auf, welches im dargestellten Ausführungsbeispiel aus einem Hebel 6 mit einer Tastrolle 7 besteht. Statt des Hebels 6 mit Tastrolle 7 kann ein derartiger Grenztaster allerdings auch mit einem Stößel oder einem anders gestalteten Schaltorgan ausgestattet sein.The limit switch 1 has a switching element, which in the exemplary embodiment shown consists of a lever 6 with a feeler roller 7. Instead of the lever 6 with sensing roller 7, such a limit switch can, however, also be equipped with a plunger or a differently designed switching element.

Weiterhin weist der Grenztaster 1 eine Anzeigeeinrichtung 8 auf, die erfindungsgemäß aus einer im Gehäuse 2 angeordneten Leuchtdiode 9 und einem Lichtleiter 10 besteht.Furthermore, the limit switch 1 has a display device 8, which according to the invention consists of a light-emitting diode 9 arranged in the housing 2 and a light guide 10.

Wie insbesondere Figur 1 deutlich zeigt, ist der Lichtleiter 10 unmittelbar oberhalb der Leuchtdiode 9 angeordnet und durchtritt den Deckel 3 im Bereich einer Bohrung 11. Der außerhalb des Deckels 3 liegende Bereich 12 des Lichtleiters 10 ist linsenartig ausgebildet und weist im dargestellten Ausführungsbeispiel eine kegelstumpfartige Außenkontur auf. Der äußere Bereich 12 des Lichtleiters 10 ist mit einem größeren Durchmesser ausgestattet als die Durchtrittsbohrung 11, so daß sowohl diese Durchtrittsbohrung 11 wie auch eine Ansenkung 13 innerhalb des Deckels 3, die konzentrisch zur Durchgangsbohrung 11 verläuft, überdeckt wird. In dieser Ansenkung 13 ist ein wasserdichter und/oder öldichter Kleber vorgesehen, der den Lichtleiter 10 nicht nur im Deckel 3 fixiert, sondern auch für eine einwandfreie Abdichtung der Durchtrittsbohrung 11 sorgt.As is particularly evident in FIG. 1, the light guide 10 is arranged and passes directly above the light-emitting diode 9 the cover 3 in the area of a bore 11. The area 12 of the light guide 10 lying outside the cover 3 is designed like a lens and has a truncated cone-like outer contour in the exemplary embodiment shown. The outer region 12 of the light guide 10 is equipped with a larger diameter than the through hole 11, so that both this through hole 11 and a countersink 13 within the cover 3, which runs concentrically to the through hole 11, is covered. In this countersink 13, a waterproof and / or oil-tight adhesive is provided, which not only fixes the light guide 10 in the cover 3, but also ensures a perfect seal of the through bore 11.

Wie Figur 1 weiterhin deutlich macht, ist der kegelstumpfartige äußere Bereich 12 des Lichtleiters 10 mit einer koaxial zur Außenkontur verlaufenden, kegelstumpfartigen Ausnehmung 14 versehen. Diese Gestaltung des äußeren Bereiches 12 des Lichtleiters 10 gewährleistet, daß auch bei ungünstigen Betrachtungswinkeln unzweifelhaft erkennbar ist, ob die Leuchtdiode 9 ein- oder ausgeschaltet ist.As FIG. 1 also makes clear, the frustoconical outer region 12 of the light guide 10 is provided with a frustoconical recess 14 that runs coaxially to the outer contour. This design of the outer region 12 of the light guide 10 ensures that even with unfavorable viewing angles it is undoubtedly recognizable whether the light-emitting diode 9 is switched on or off.

Der Lichtleiter 10 ist vorteilhafterweise aus Kunststoff oder aus einem schlagfesten Glas hergestellt, so daß keine Gefahr besteht, daß der Lichtleiter 10 durch äußere, mechanische Einflüsse zerstört wird.The light guide 10 is advantageously made of plastic or an impact-resistant glass, so that there is no risk that the light guide 10 is destroyed by external, mechanical influences.

Abweichend vom dargestellten Ausführungsbeispiel, welches als besonders vorteilhaft anzusehen ist, besteht natürlich auch die Möglichkeit, den Lichtleiter 10 statt durch den Deckel 3 durch eine der Gehäusewandungen des Gehäuses 2 hindurchzuführen.Deviating from the illustrated embodiment, which is to be regarded as particularly advantageous, there is of course also the possibility of passing the light guide 10 through one of the housing walls of the housing 2 instead of through the cover 3.

Claims (6)

  1. A limit switch having a housing (2) closed by a cover (3), and a switch member comprising a lever (6), a push rod or the like, and an optical display device (8) for the respective switching condition, characterised in that the display device (8) comprises a light emitting diode (9) arranged in the housing (2) and an optical fibre (10) arranged directly thereover, wherein the optical fibre (10) passes through one of the housing walls or the cover (3) and is sealingly connected to the housing wall or the cover (3) and is of a lens-like configuration in the region (12) outside the wall or the cover (3).
  2. A limit switch according to claim 1 characterised in that the optical fibre (10) comprises plastics.
  3. A limit switch according to claim 1 characterised in that the optical fibre comprises impact-resistant glass.
  4. A limit switch according to one or more of claims 1 to 3 characterised in that the optical fibre (10) is of a frustoconical external contour in the region (12) outside the housing wall or the cover (3).
  5. A limit switch according to claim 4 characterised in that the frustoconical outer region (12) of the optical fibre (10) is provided with a frustoconical recess (14) which extends coaxially with respect to the external contour.
  6. A limit switch according to one or more of the preceding claims characterised in that the outer region (12) of the optical fibre (10) is of a larger surface area than its portion passing through the housing wall or the cover (3) so that this outer region (12) covers both the through bore (11) and also a countersink (13) which is arranged coaxially with respect to the through bore (11) and which is filled with an adhesive.
EP93102940A 1992-04-10 1993-02-25 Limit switch Expired - Lifetime EP0564798B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9205015U DE9205015U1 (en) 1992-04-10 1992-04-10 Limit switch
DE9205015U 1992-04-10

Publications (2)

Publication Number Publication Date
EP0564798A1 EP0564798A1 (en) 1993-10-13
EP0564798B1 true EP0564798B1 (en) 1996-04-10

Family

ID=6878407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93102940A Expired - Lifetime EP0564798B1 (en) 1992-04-10 1993-02-25 Limit switch

Country Status (3)

Country Link
EP (1) EP0564798B1 (en)
DE (2) DE9205015U1 (en)
ES (1) ES2085664T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9205015U1 (en) * 1992-04-10 1992-06-17 Hans Bernstein Spezialfabrik für Schaltkontakte GmbH & Co, 4952 Porta Westfalica Limit switch

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2254765A1 (en) * 1972-11-09 1974-05-16 Maecker Elan Schaltelemente LIMIT SWITCH WITH OPTICAL DISPLAY
DE3802647C2 (en) * 1988-01-29 1998-02-05 Lectra Trading Ag Display device for the switching state of a circuit breaker
DE9001186U1 (en) * 1990-02-02 1990-05-17 S.W.E.C. Schmitt-Walter Engineering Consult, 82008 Unterhaching Illuminated push button switch
DE9205015U1 (en) * 1992-04-10 1992-06-17 Hans Bernstein Spezialfabrik für Schaltkontakte GmbH & Co, 4952 Porta Westfalica Limit switch

Also Published As

Publication number Publication date
DE59302143D1 (en) 1996-05-15
ES2085664T3 (en) 1996-06-01
DE9205015U1 (en) 1992-06-17
EP0564798A1 (en) 1993-10-13

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