EP0320875A2 - Lighting device for household appliances such as ovens - Google Patents

Lighting device for household appliances such as ovens Download PDF

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Publication number
EP0320875A2
EP0320875A2 EP19880120801 EP88120801A EP0320875A2 EP 0320875 A2 EP0320875 A2 EP 0320875A2 EP 19880120801 EP19880120801 EP 19880120801 EP 88120801 A EP88120801 A EP 88120801A EP 0320875 A2 EP0320875 A2 EP 0320875A2
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EP
European Patent Office
Prior art keywords
lamp
insulating material
contact
lighting device
protective
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
EP19880120801
Other languages
German (de)
French (fr)
Other versions
EP0320875B1 (en
EP0320875A3 (en
Inventor
Günter Dipl.-Ing. Hammerl
Kurt Lintner
Josef Dipl.-Ing. Krautscheid
Johann Klement
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.)
BOSCH-SIEMENS HAUSGERAETE GMBH
Original Assignee
Individual
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Publication date
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Publication of EP0320875A2 publication Critical patent/EP0320875A2/en
Publication of EP0320875A3 publication Critical patent/EP0320875A3/en
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Publication of EP0320875B1 publication Critical patent/EP0320875B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R33/00—Coupling devices specially adapted for supporting apparatus and having one part acting as a holder providing support and electrical connection via a counterpart which is structurally associated with the apparatus, e.g. lamp holders; Separate parts thereof
    • H01R33/05—Two-pole devices
    • H01R33/06—Two-pole devices with two current-carrying pins, blades or analogous contacts, having their axes parallel to each other
    • H01R33/09—Two-pole devices with two current-carrying pins, blades or analogous contacts, having their axes parallel to each other for baseless lamp bulb
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/0005—Fastening of light sources or lamp holders of sources having contact pins, wires or blades, e.g. pinch sealed lamp
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/008—Illumination for oven cavities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/30—Lighting for domestic or personal use
    • F21W2131/307—Lighting for domestic or personal use for ovens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/44—Means for preventing access to live contacts

Definitions

  • the present invention relates to an electrical lighting device for domestic appliances, such as ovens, with an electrical, contact parts having a lamp holder made of insulating material, into which a lamp having an lamp base made of insulating material can be inserted with its contact pins emanating from this lamp base and can be contacted with the contact parts of the lamp holder is, wherein the insertion opening of the lamp holder protective elements made of electrically insulating material are assigned, which extend over a length of the lamp plug-in movement exceeding the plug-in contact distance or the contact pins with the required safety amount.
  • Such lighting devices can be independent electrical lights, which are arranged in the household appliances, or they are an integral part of household appliances.
  • touchable metallic parts that are connected to a protective conductor must be separated from live parts at an operating voltage of up to 130 V by operational insulation, taking into account an air gap of at least 1.5 mm and a creepage distance above the insulation material of at least 2.0 mm.
  • overvoltages can also occur in domestic appliances, safety distances from live parts that can be touched in the case of touchable glass bulbs of lamps must be observed, to the extent that, in the worst case, the test point of 2750 V is present on the live parts on this glass bulb not harmful.
  • clearances of at least 8.0 mm and creepage distances of at least 8.0 mm leading over the insulating material must be realized.
  • contact protection elements are arranged in the insertion opening of the lamp holder, and these extend over a length of the lamp plug-in movement between the contact pins and the contact plug or contact pins Insert the luminaire into a protective gap that prevents manual access.
  • These contact protection elements are made of electrically insulating material.
  • These contact protection elements are optionally assigned to either the lamp or the lamp base of the electric lamp.
  • the present invention has for its object to design electrical lighting devices in such a way that both contact with live parts is completely excluded and there is also sufficient protection against the formation of electrical flashovers and creepage distances in the event of overvoltages.
  • these measures should be usable in connection with small installation dimensions and compact construction, as are usually followed in lighting devices with plug-in sockets, that is to say in particular for so-called low-voltage lamps, for example halogen lamps.
  • An electrical lighting device which meets these requirements to an outstanding degree is characterized according to the invention in that the leakage currents, which consist of electrically insulating material, are sufficiently exclusive
  • the lamp holder is covered at least on the access side of the lamp holder of the lighting device with an electrically conductive and protective-grounded protective element reaching into the vicinity of the lamp glass bulb or its lamp base, which is made of insulating material, and that the distance between this protective element and the contact parts of the lamp holder is in the plug-in direction of the lamp a required security amount is greater than the length of the contact pins of the lamp.
  • This measure according to the features according to the invention ensures that a protective-earthed protective element offers reliable protection against contact with the live parts of the lamp holder and the contact pins of the lamp, particularly when they are replaced. In spite of the insulation measures, arcing and leakage currents are certainly made harmless by the measures taken for the operator.
  • the electrical lighting device is characterized in that the electrically conductive and protective-earthed protective element is designed like a plate and is arranged on the access side in front of the lamp holder made of electrically insulating material, and is designed with a recess that is corresponding to the cross section of the lamp.
  • the circuit-board-like, electrically conductive and protective-grounded protective element can either be tubular or surround the lamp socket made of insulating material, or it can be arranged on struts which lead past the lamp socket made of insulating material.
  • this electrically conductive protective element is electrically conductively connected to protective-earthed housing parts.
  • the electrical lighting device according to the invention is characterized in that the electrically conductive, protective-earthed protective element is arranged at a spatial distance from the lamp holder made of insulating material. This not only increases the leakage current gap between the electrically conductive parts, but also ensures that this is electrical conductive and thus usually also good heat-conducting protective element also represents a heat shield that shields the contact point between the contact pins of the lamp and the contact parts of the lamp holder. This is particularly desirable when the electrical lighting device is used in ovens. The high baking temperatures put a high load on these connectors.
  • the lighting device according to the invention is shown in each case as an independent lamp, specifically on a greatly enlarged scale.
  • a lamp 3 usually a low-voltage lamp, is inserted into this lamp holder 2.
  • This lamp 3 has a usually cylindrical lamp bulb 4, which is transferred to a pinched or tapered lamp base 5, and contact pins 6 of length a.
  • the contact pins 6 make contact with electrical contact parts 7 of the lamp base, these contact parts 7 extending in the form of contact rails along the contact pins 6 and being pressed against the contact pins 6 by springs 8.
  • the area of contact between the contact parts 7 and the contact pins 6 is referred to below as the plug contact path.
  • the contact pins 6 are pre-centered with respect to the contact parts 7. From these plug-in openings 9, the lamp holder 2 has an integrally formed, tubular extension 10 of larger diameter, into which at least a large part of the lamp base 5 fits.
  • a lens-shaped, transparent glass cover 12 is screwed onto a flange 11 of the lamp housing 1. This glass cover 12 is unscrewed for inserting or replacing the lamp 3. Now e.g. the lamp 3 is pulled out of the lamp holder 2, the danger should be met that there is a manual contact with the contact pins 6 which have not yet been completely detached from the contact parts 7.
  • a protective element 13 made of electrically conductive material is arranged above the lamp holder 2 made of insulating ceramic material, which encloses the tubular extension 10 of the lamp holder 2 made of insulating ceramic material in a cylindrical manner in the upper region is brought up to the wall of the lamp base 5 and is connected in an electrically conductive manner to the lamp housing 1 in the lower region via connecting bolts 14 passed through the lamp socket 2 and can thus be grounded with the latter.
  • the length e between the upper edge of the protective element 13 and the first possibility of contact between the contact pins 6 and the contact parts 7 is greater than the length a of the contact pins 6 and the wall thickness of the protective element 13, namely by an amount that corresponds to the required safety distances corresponds.
  • the tubular extension 10 of the lamp holder 2 Due to the tubular extension 10 of the lamp holder 2, the distances between the current-carrying parts and the protective-earthed part on the ceramic surface are brought to the required level in order to prevent creepage distances.
  • An air gap is provided between the inner wall of the protective element 13 and the lamp holder 2, in which air convection is possible to a limited extent.
  • the electrically conductive and protective-grounded protective element 13 also forms a heat shield with respect to the lamp holder 2, so that in particular the electrical contact points between the contact pins 6 and the contact parts 7 are relieved in terms of heat.
  • a protection element 17 designed like a circuit board is arranged for protection against contact, which is fastened to the lamp housing 1 via struts 18 and is connected to it in an electrically conductive manner.
  • the desired distance ratios correspond to those in the embodiment according to FIG. 1.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Connecting Device With Holders (AREA)
  • Electric Stoves And Ranges (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Endoscopes (AREA)
  • Electric Ovens (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Radiation-Therapy Devices (AREA)

Abstract

A lighting device for household appliances such as ovens, includes an electric lamp socket formed of electrically insulating material preventing leakage currents. Contact parts are disposed in the socket. The socket has an access side with a plug-in opening formed therein into which a lamp with a glass bulb, a lamp base of insulating material and contact prongs protruding from the lamp base is to be plugged into contact with the contact parts in a given plug-in direction. An electrically conductive and protectively grounded protective element covers at least the access side of the lamp socket and extends to the vicinity of at least one of the glass bulb and the lamp base. The protective element and the contact parts are spaced apart by a distance being greater than the length of the contact prongs by a required margin of safety, as seen in the given plug-in direction.

Description

Die vorliegende Erfindung bezieht sich auf eine elektrische Beleuchtungseinrichtung für Hausgeräte, wie Backöfen mit einer aus Isolierstoff bestehenden elektrischen, Kontaktteile aufweisenden Lampenfassung, in die eine einen aus Isoliermaterial be­stehenden Lampensockel aufweisende Lampe mit ihren von diesem Lampensockel ausgehenden Kontaktstiften einsteckbar und mit den Kontaktteilen der Lampenfas­sung kontaktierbar ist, wobei der Einstecköffnung der Lampenfassung Schutzelemente aus elektrisch isolierendem Material zugeordnet sind, die sich über eine die Steck­kontaktstrecke bzw. die Kontaktstifte mit erforderlichem Sicherheitsbetrag überstei­gende Länge der Lampen-Steckbewegung erstrecken.The present invention relates to an electrical lighting device for domestic appliances, such as ovens, with an electrical, contact parts having a lamp holder made of insulating material, into which a lamp having an lamp base made of insulating material can be inserted with its contact pins emanating from this lamp base and can be contacted with the contact parts of the lamp holder is, wherein the insertion opening of the lamp holder protective elements made of electrically insulating material are assigned, which extend over a length of the lamp plug-in movement exceeding the plug-in contact distance or the contact pins with the required safety amount.

Derartige Beleuchtungseinrichtungen können eigenständige elektrische Leuchten sein, welche in den Haushaltsgeräten angeordnet werden, oder sie sind integraler Bestand­teil von Hausgeräten.Such lighting devices can be independent electrical lights, which are arranged in the household appliances, or they are an integral part of household appliances.

Für derartige elektrische Beleuchtungseinrichtungen besteht aus Sicherheitsgründen die Forderung, daß beim Ein- und Aufstecken der Lampe eine Berührung von strom­führenden Kontaktteilen selbst bei unsachgemäßer Handhabung nicht möglich sein darf. Darüber hinaus ist auch zu berücksichtigen, daß genügend große Abstände zwi­schen stromführenden Teilen und berührbaren Bereichen sowie sonstigen elektrisch leitfähigen Materialien als Freiraum und als Isoliermaterialstrecke eingehalten wer­den, damit die Gefahr von elektrischen Überschlägen und sich ausbildenden elektri­schen Kriechstrecken zwischen den stromführenden Teilen und berührbaren Bereichen sowie weiteren elektrisch leitfähigen Teilen weitestgehend ausgeschlossen sind.For safety reasons, there is a requirement for such electrical lighting devices that when the lamp is plugged in and plugged in, it may not be possible for current-carrying contact parts to come into contact, even when handled improperly. In addition, it must also be taken into account that sufficient distances between current-carrying parts and touchable areas and other electrically conductive materials are maintained as free space and as an insulating material section, so that there is a risk of electrical flashovers and electrical creepage distances between the current-carrying parts and touchable areas and others electrically conductive parts are largely excluded.

So wird gefordert, daß berührbare metallische Teile, die mit einem Schutzleiter ver­bunden sind, von spannungsführenden Teilen bei einer Arbeitsspannung von bis zu 130 V durch eine Betriebsisolierung getrennt sein müssen, und zwar unter Beachtung einer Luftstrecke von mindestens 1,5 mm und einer Kriechstrecke über das Isoliermaterial von mindestens 2,0 mm. Da auch bei Hausgeräten Überspannungen auftreten können, sind für berührbare Glaskolben von Lampen darüber hinausgehende Sicherheitsabstän­de von spannungsführenden Teilen zu beachten, und zwar dahingehend, daß gemessen an der im ungünstigsten Fall noch berührbaren Stelle an diesem Glaskolben eine Prüfspannung von 2750 V an den spannungsführenden Teilen sich nicht schädlich auswirkt. Dazu sind Luftstrecken von mindestens 8.0 mm und über das isolierende Material führende Kriechstrecken von mindestens 8,0 mm zu realisieren.It is required that touchable metallic parts that are connected to a protective conductor must be separated from live parts at an operating voltage of up to 130 V by operational insulation, taking into account an air gap of at least 1.5 mm and a creepage distance above the insulation material of at least 2.0 mm. As overvoltages can also occur in domestic appliances, safety distances from live parts that can be touched in the case of touchable glass bulbs of lamps must be observed, to the extent that, in the worst case, the test point of 2750 V is present on the live parts on this glass bulb not harmful. For this purpose, clearances of at least 8.0 mm and creepage distances of at least 8.0 mm leading over the insulating material must be realized.

Bei einer elektrischen Leuchte für Hausgeräte sind beispielsweise bekanntgewordene Maßnahmen anwendbar (DE-GM 87 11 524), wonach in der Einstecköffnung der Lampenfassung Berührungsschutzelemente angeordnet sind, die über eine die Steck­kontaktstrecke bzw. die Kontaktstifte übersteigende Länge der Lampen-Steckbewe­gung zwischen den Kontaktstiften und der Leuchten-Steckseite einen den manuellen Durchgriff verhindernden Schutzspalt bilden. Diese Berührungsschutzelemente beste­hen aus elektrisch isolierendem Material. Wahlweise sind diese Berührungschutzele­mente entweder der Lampe oder dem Lampensockel der elektrischen Leuchte zuge­ordnet.In the case of an electrical light for household appliances, for example, measures which have become known can be used (DE-GM 87 11 524), according to which contact protection elements are arranged in the insertion opening of the lamp holder, and these extend over a length of the lamp plug-in movement between the contact pins and the contact plug or contact pins Insert the luminaire into a protective gap that prevents manual access. These contact protection elements are made of electrically insulating material. These contact protection elements are optionally assigned to either the lamp or the lamp base of the electric lamp.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, elektrische Beleuchtungsein­richtungen dahingehend auszugestalten, daß sowohl die Berührung von stromführenden Teilen gänzlich ausgeschlossen wird und darüberhinaus genügender Schutz gegen Bil­dung von elektrischen Überschlägen und Kriechstrecken bei Überspannungen gegeben ist. Insbesondere sollen diese Maßnahmen einsetzbar sein im Zusammenhang mit kleinen Einbaumaßen und gedrängter Bauweise, wie sie üblicherweise bei Beleuch­tungseinrichtungen mit Stecksockelfassungen, also insbesondere für sogenannte Nie­dervoltlampen, beispielsweise Halogenlampen befolgt werden.The present invention has for its object to design electrical lighting devices in such a way that both contact with live parts is completely excluded and there is also sufficient protection against the formation of electrical flashovers and creepage distances in the event of overvoltages. In particular, these measures should be usable in connection with small installation dimensions and compact construction, as are usually followed in lighting devices with plug-in sockets, that is to say in particular for so-called low-voltage lamps, for example halogen lamps.

Eine elektrische Beleuchtungseinrichtung, die diesen Anforderungen in hervorragen­dem Maße gerecht wird, ist erfindungsgemäß dadurch gekennzeichnet, daß die aus elektrisch isolierendem Material bestehende, Kriechströme ausreichend ausschließende Lampenfassung zumindest auf der Zugriffseite der Lampenfassung der Beleuchtungs­einrichtung überdeckt ist mit einem bis in den Nahbereich des Lampenglaskolbens bzw. dessen aus Isoliermaterial bestehenden Lampensockels heranreichendes, elek­trisch leitendes und schutzgeerdetes Schutzelement und daß der Abstand zwischen diesem Schutzelement und den Kontaktteilen der Lampenfassung in Steckrichtung der Lampe um einen geforderten Sicherheitsbetrag größer ist als die Länge der Kon­taktstifte der Lampe.An electrical lighting device which meets these requirements to an outstanding degree is characterized according to the invention in that the leakage currents, which consist of electrically insulating material, are sufficiently exclusive The lamp holder is covered at least on the access side of the lamp holder of the lighting device with an electrically conductive and protective-grounded protective element reaching into the vicinity of the lamp glass bulb or its lamp base, which is made of insulating material, and that the distance between this protective element and the contact parts of the lamp holder is in the plug-in direction of the lamp a required security amount is greater than the length of the contact pins of the lamp.

Diese Maßnahme nach den erfindungsgemäßen Merkmalen stellt sicher, daß ein schutzgeerdetes Schutzelement einen sicheren Berührungsschutz gegenüber den strom­führenden Teilen der Lampenfassung sowie der Kontaktstifte der Lampe insbesondere bei deren Auswechslung bietet. Trotz der Isoliermaßnahmen auftretende Überschläge und Kriechströme werden damit durch die getroffenen Maßnahmen für die Bedie­nungsperson sicher unschädlich gemacht.This measure according to the features according to the invention ensures that a protective-earthed protective element offers reliable protection against contact with the live parts of the lamp holder and the contact pins of the lamp, particularly when they are replaced. In spite of the insulation measures, arcing and leakage currents are certainly made harmless by the measures taken for the operator.

Nach einer bevorzugten Ausgestaltung ist die erfindungsgemäße elektrische Beleuch­tungseinrichtung dadurch gekennzeichnet, daß das elektrisch leitende und schutzgeer­dete Schutzelement platinenartig ausgebildet und mit einem dem Querschnitt der Lampe entsprechend freizügigen Ausnehmung ausgestaltet zugriffsseitig vor der aus elektrisch isolierendem Material bestehenden Lampenfassung angeordent ist.According to a preferred embodiment, the electrical lighting device according to the invention is characterized in that the electrically conductive and protective-earthed protective element is designed like a plate and is arranged on the access side in front of the lamp holder made of electrically insulating material, and is designed with a recess that is corresponding to the cross section of the lamp.

Das platinenartig ausgebildete, elektrisch leitende und schutzgeerdete Schutzelement kann in diesem Zusammenhang entweder rohrförmig die aus Isoliermaterial beste­hende Lampenfassung umschließend ausgebildet bzw. weitergeführt sein, bzw. auf am aus Isoliermaterial bestehenden Lampenfassung vorbeiführenden Streben angeordnet sein. Über beide Maßnahmen ist dieses elektrisch leitende Schutzelement mit schutz­geerdeten Gehäuseteilen elektrisch leitend verbunden.In this context, the circuit-board-like, electrically conductive and protective-grounded protective element can either be tubular or surround the lamp socket made of insulating material, or it can be arranged on struts which lead past the lamp socket made of insulating material. By means of both measures, this electrically conductive protective element is electrically conductively connected to protective-earthed housing parts.

Nach einer bevorzugten Weiterbildung ist die erfindungsgemäße elektrische Beleuch­tungseinrichtung dadurch gekennzeichnet, daß das elektrisch leitende, schutzgeerdete Schutzelement mit räumlichem Abstand zur aus Isoliermaterial bestehenden Lampen­fassung angeordnet ist. Damit wird nicht nur der Kriechstromabstand zwischen den elektrisch leitfähigen Teilen vergrößert, sondern auch erreicht, daß das elektrisch leitende und damit auch üblicherweise gut wärmeleitende Schutzelement zusätzlich ein Wärmeschild darstellt, das die Kontaktstelle zwischen den Kontaktstiften der Lampe und den Kontaktteilen der Lampenfassung wärmetechnisch abschirmt. Dies ist besonders wünschenswert bei dem Einsatz der elektrischen Beleuchtungseinrichtung in Backöfen. Die hohen Backtemperaturen stellen nämlich eine hohe Belastung für die­se Steckverbindungen dar.According to a preferred development, the electrical lighting device according to the invention is characterized in that the electrically conductive, protective-earthed protective element is arranged at a spatial distance from the lamp holder made of insulating material. This not only increases the leakage current gap between the electrically conductive parts, but also ensures that this is electrical conductive and thus usually also good heat-conducting protective element also represents a heat shield that shields the contact point between the contact pins of the lamp and the contact parts of the lamp holder. This is particularly desirable when the electrical lighting device is used in ovens. The high baking temperatures put a high load on these connectors.

Nach den Merkmalen der Erfindung ausgestattete Ausführungsbeispiele sind anhand der Zeichnung im folgenden näher erläutert. Es zeigen:

  • Fig. 1 eine Anordnung mit einem elektrisch leitenden Schutzelement, welches rohrförmig das aus Isoliermaterial bestehende Lampenfassung umschließt und
  • Fig. 2 ein schildartiges, elektrisch leitendes und schutzgeerdetes Schutzele­ment, welches auf am aus Isoliermaterial bestehenden Lampenfassung seitlich vorbeigeführten Streben angeordnet ist.
Exemplary embodiments equipped according to the features of the invention are explained in more detail below with reference to the drawing. Show it:
  • Fig. 1 shows an arrangement with an electrically conductive protective element, which tubularly encloses the lamp socket made of insulating material and
  • Fig. 2 is a shield-like, electrically conductive and protective grounded protective element, which is arranged on the side of the lamp socket made of insulating material past struts.

In den Figuren ist die erfindungsgemäße Beleuchtungseinrichtung jeweils als eigen­ständige Leuchte dargestellt, und zwar in stark vergrößertem Maßstab.In the figures, the lighting device according to the invention is shown in each case as an independent lamp, specifically on a greatly enlarged scale.

In einem napfartigen, einseitig offenen Lampengehäuse 1 ist eine aus elektrisch iso­lierendem Material, z.B. Keramik, bestehende Lampenfassung 2 befestigt. In diese Lampenfassung 2 ist eine Lampe 3, üblicherweise eine Niederspannungslampe einge­steckt. Diese Lampe 3 besitzt einen üblicherweise zylindrischen Lampenkolben 4, welcher zu einem eingequetschten oder verjüngten Lampensockel 5 übergeführt ist, sowie Kontaktstifte 6 der Länge a. In der gezeigten eingesteckten Stellung der Lampe 3 kontaktieren die Kontaktstifte 6 mit elektrischen Kontaktteilen 7 des Lampensockels, wobei sich diese Kontaktteile 7 in Form von Kontaktschienen ent­lang den Kontaktstiften 6 erstrecken und durch Federn 8 gegen die Kontaktstifte 6 gedrückt werden. Der Berührungsbereich zwischen den Kontaktteilen 7 und den Kon­taktstiften 6 wird nachstehend als Steckkontaktstrecke bezeichnet. Durch Einsteck­öffnungen 9 sind die Kontaktstifte 6 gegenüber den Kontaktteilen 7 vorzentriert Im Anschluß ab diese Einstecköffnungen 9 besitzt die Lampenfassung 2 eine angeformte, rohrartige Verlängerung 10 größeren Durchmessers, in welchen zumindest ein Groß­teil des Lampensockels 5 hineinpaßt.A lamp holder 2 made of electrically insulating material, for example ceramic, is fastened in a cup-like lamp housing 1 which is open on one side. A lamp 3, usually a low-voltage lamp, is inserted into this lamp holder 2. This lamp 3 has a usually cylindrical lamp bulb 4, which is transferred to a pinched or tapered lamp base 5, and contact pins 6 of length a. In the inserted position of the lamp 3 shown, the contact pins 6 make contact with electrical contact parts 7 of the lamp base, these contact parts 7 extending in the form of contact rails along the contact pins 6 and being pressed against the contact pins 6 by springs 8. The area of contact between the contact parts 7 and the contact pins 6 is referred to below as the plug contact path. Through plug-in openings 9, the contact pins 6 are pre-centered with respect to the contact parts 7. From these plug-in openings 9, the lamp holder 2 has an integrally formed, tubular extension 10 of larger diameter, into which at least a large part of the lamp base 5 fits.

Auf einen Flansch 11 des Lampengehäuses 1 ist eine linsenförmige, transparente Glasabdeckung 12 aufgeschraubt. Zum Einsetzen oder Auswechseln der Lampe 3 wird diese Glasabdeckung 12 abgeschraubt. Wird nun z.B. die Lampe 3 aus der Lampen­fassung 2 herausgezogen, so soll der Gefahr begegnet sein, daß eine manuelle Berührung mit den von den Kontaktteilen 7 noch nicht völlig gelösten Kontaktstiften 6 stattfindet.A lens-shaped, transparent glass cover 12 is screwed onto a flange 11 of the lamp housing 1. This glass cover 12 is unscrewed for inserting or replacing the lamp 3. Now e.g. the lamp 3 is pulled out of the lamp holder 2, the danger should be met that there is a manual contact with the contact pins 6 which have not yet been completely detached from the contact parts 7.

Um diese Gefahr zu bannen, ist bei der Anordnung gemäß Fig. 1 oberhalb des aus isolierendem Keramikmaterial bestehenden Lampenfassung 2 ein Schutzelement 13 aus elektrisch leitendem Material angeordnet, welches die rohrartige Verlängerung 10 der aus isolierendem Keramikmaterial bestehenden Lampenfassung 2 zylinderför­mig umschließt, im oberen Bereich nahe an die Wandung des Lampensockels 5 herangeführt ist und im unteren Bereich über durch die Lampenfassung 2 hindurch­geführte Verbindungsbolzen 14 elektrisch leitend mit dem Lampengehäuse 1 verbun­den ist und damit mit diesem schutzgeerdet werden kann. Dabei ist die Länge e zwischen der Oberkante des Schutzelements 13 und der ersten Kontaktiermöglichkeit zwischen den Kontaktstiften 6 und den Kontaktteilen 7 größer als die Länge a der Kontaktstifte 6 und der Wandstärke des Schutzelements 13 bemessen, und zwar grö­ßer um einen Betrag, der den geforderten Sicherheitsabständen entspricht. Durch die rohrartige Verlängerung 10 der Lampenfassung 2 werden die Entfernungen zwischen den stromführenden Teilen und dem schutzgeerdeten Teil auf der Keramikoberfläche zur Verhinderung von Kriechstrecken auf das erforderliche Maß gebracht. Zwischen der Innenwandung des Schutzelements 13 und der Lampenfassung 2 ist ein Luftspalt vorgesehen, in dem eine Luftkonvektion begrenzt möglich ist. Durch diese Maßnahme bildet das elektrisch leitende und schutzgeerdete Schutzelement 13 gegenüber der Lampenfassung 2 auch einen Wärmeschild, so daß insbesondere die elektrischen Kon­taktstellen zwischen den Kontaktstiften 6 und den Kontaktteilen 7 wärmetechnisch entlastet werden.In order to avoid this danger, a protective element 13 made of electrically conductive material is arranged above the lamp holder 2 made of insulating ceramic material, which encloses the tubular extension 10 of the lamp holder 2 made of insulating ceramic material in a cylindrical manner in the upper region is brought up to the wall of the lamp base 5 and is connected in an electrically conductive manner to the lamp housing 1 in the lower region via connecting bolts 14 passed through the lamp socket 2 and can thus be grounded with the latter. The length e between the upper edge of the protective element 13 and the first possibility of contact between the contact pins 6 and the contact parts 7 is greater than the length a of the contact pins 6 and the wall thickness of the protective element 13, namely by an amount that corresponds to the required safety distances corresponds. Due to the tubular extension 10 of the lamp holder 2, the distances between the current-carrying parts and the protective-earthed part on the ceramic surface are brought to the required level in order to prevent creepage distances. An air gap is provided between the inner wall of the protective element 13 and the lamp holder 2, in which air convection is possible to a limited extent. As a result of this measure, the electrically conductive and protective-grounded protective element 13 also forms a heat shield with respect to the lamp holder 2, so that in particular the electrical contact points between the contact pins 6 and the contact parts 7 are relieved in terms of heat.

Gemäß Fig. 2 ist für den Berührungsschutz ein platinenartig ausgebildetes Schutze­lement 17 angeordnet, welches über Streben 18 auf dem Lampengehäuse 1 befestigt und mit diesem elektrisch leitend verbunden ist. Die anzustrebenden Abstandsverhält­nisse entsprechen denen bei der Ausführungsform gemäß Fig. 1.According to FIG. 2, a protection element 17 designed like a circuit board is arranged for protection against contact, which is fastened to the lamp housing 1 via struts 18 and is connected to it in an electrically conductive manner. The desired distance ratios correspond to those in the embodiment according to FIG. 1.

Claims (5)

1. Beleuchtungseinrichtung für Hausgeräte, wie Backöfen mit einer aus Isolierstoff bestehenden elektrischen, Kontaktteile aufweisenden Lampenfassung, in die eine einen aus Isoliermaterial bestehenden Lampensockel aufweisende Lampe mit ih­ren von diesem Lampensockel ausgehenden Kontaktstiften einsteckbar und mit den Kontaktteilen der Lampenfassung kontaktierbar ist, wobei der Einstecköff­nung der Lampenfassung Schutzelemente aus elektrisch isolierendem Material zugeordnet sind, die sich über eine die Steckkontaktstrecke bzw. die Kontakt­stifte mit erforderlichem Sicherheitsbetrag übersteigende Länge der Lampen-­Steckbewegung erstrecken, dadurch gekennzeichnet, daß die aus elektrisch isolierendem Material bestehende, Kriechströme ausreichend ausschlie­ßende Lampenfassung (2) zumindest auf der Zugriffseite der Lampenfassung (2) der Beleuchtungseinrichtung überdeckt ist mit einem bis in den Nahbereich des Lampenglaskolbens (4) bzw. dessen aus Isoliermaterial bestehenden Lampensok­kels (5) heranreichendes, elektrisch leitendes und schutzgeerdetes Schutzelement (13, 17) und daß der Abstand zwischen diesem Schutzelement (13, 17) und den Kontaktteilen (7) der Lampenfassung (2) in Steckrichtung der Lampe (3) um einen geforderten Sicherheitsbetrag größer ist als die Länge der Kontaktstifte (6) der Lampe (3).1.Lighting device for domestic appliances, such as ovens with an electrical, electrical, contact parts having a lamp holder into which a lamp consisting of an insulating material lamp base can be inserted with its contact pins emanating from this lamp base and can be contacted with the contact parts of the lamp holder, the insertion opening of the Lamp holder protective elements made of electrically insulating material are assigned, which extend over a length of the plug-in movement exceeding the plug-in contact distance or the contact pins with the required safety amount, characterized in that the lamp holder (2) consisting of electrically insulating material and sufficiently excluding leakage currents (2) at least the access side of the lamp holder (2) of the lighting device is covered with a lamp base (5) made up of the insulating glass material (5) Calibrating, electrically conductive and protective earthed protective element (13, 17) and that the distance between this protective element (13, 17) and the contact parts (7) of the lamp holder (2) in the plug-in direction of the lamp (3) is greater than that by a required safety amount Length of the contact pins (6) of the lamp (3). 2. Beleuchtungseinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das elek­trisch leitende und schutzgeerdete Schutzelement (13, 17) platinenartig ausgebil­det und mit einem dem Querschnitt der Lampe (3) entsprechend freizügigen Ausnehmung ausgestaltet, zugriffsseitig vor der aus elektrisch isolierendem Ma­terial bestehenden Lampenfassung (2) angeordnet ist.2. Lighting device according to claim 1, characterized in that the electrically conductive and protective earthed protective element (13, 17) is formed like a board and is designed with a cross section of the lamp (3) correspondingly clear recess, access side in front of the lamp socket made of electrically insulating material (2nd ) is arranged. 3. Beleuchtungseinrichtung nach einem der Ansprüche 1 oder 2, dadurch gekenn­zeichnet, daß das platinenartig ausgebildete, elektrisch leitende und schutzge­erdete Schutzelement (13) rohrförmig die aus Isoliermaterial bestehende Lam­penfassung (2) umschließend ausgebildet bzw. weitergeführt ist.3. Lighting device according to one of claims 1 or 2, characterized in that the circuit board-like, electrically conductive and protective-grounded protective element (13) is tubular, the lamp socket (2) made of insulating material enclosing or continuing. 4. Beleuchtungseinrichtung nach einem der Ansprüche 1 oder 2, dadurch gekenn­zeichnet, daß das platinenartig ausgebildete, elektrisch leitende und schutzge­eredete Schutzelement (17) auf an der aus Isoliermaterial bestehenden Lam­penfassung (2) vorbeiführenden Streben angeordnet ist.4. Lighting device according to one of claims 1 or 2, characterized in that the circuit board-like, electrically conductive and protection-reduced protective element (17) on the lamp socket (2) made of insulating material is arranged past struts. 5. Beleuchtungseinrichtung nach einem der Ansprüche 1 bis 4, dadurch gekenn­zeichnet, daß das elektrisch leitende, schutzgeerdete Schutzelelement (13, 17) mit räumlichem Abstand zur aus Isoliermaterial bestehenden Lampenfassung (2) angeordnet ist.5. Lighting device according to one of claims 1 to 4, characterized in that the electrically conductive, grounded Schutzelelement (13, 17) is arranged at a spatial distance from the lamp socket made of insulating material (2).
EP88120801A 1987-12-15 1988-12-13 Lighting device for household appliances such as ovens Expired - Lifetime EP0320875B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3742509 1987-12-15
DE19873742509 DE3742509A1 (en) 1987-12-15 1987-12-15 ELECTRICAL LIGHTING DEVICE FOR HOME APPLIANCES LIKE OVENS

Publications (3)

Publication Number Publication Date
EP0320875A2 true EP0320875A2 (en) 1989-06-21
EP0320875A3 EP0320875A3 (en) 1990-05-16
EP0320875B1 EP0320875B1 (en) 1994-07-27

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ID=6342665

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Application Number Title Priority Date Filing Date
EP88120801A Expired - Lifetime EP0320875B1 (en) 1987-12-15 1988-12-13 Lighting device for household appliances such as ovens

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US (1) US4870546A (en)
EP (1) EP0320875B1 (en)
AT (1) ATE109268T1 (en)
DE (2) DE3742509A1 (en)
ES (1) ES2056884T3 (en)
YU (1) YU47175B (en)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
EP0543448A1 (en) * 1991-11-18 1993-05-26 Koninklijke Philips Electronics N.V. Electric reflector lamp
EP0683367A1 (en) * 1994-05-20 1995-11-22 ELECTROLUX ZANUSSI ELETTRODOMESTICI S.p.A. Lamp holding fixture for a refrigeration apparatus
EP4092837B1 (en) * 2021-05-18 2023-08-16 BJB GmbH & Co. KG Cooking appliance lamp mount with non-riveted contact attachment

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DE8903947U1 (en) * 1989-03-31 1990-10-18 Heraeus Instruments GmbH, 6450 Hanau Contact protection for headlights
US5121304A (en) * 1990-10-15 1992-06-09 Gte Products Corporation Vehicle lamp
US5660452A (en) * 1995-08-25 1997-08-26 Maytag Corporation Indicator light for an appliance
US5879073A (en) * 1996-01-29 1999-03-09 Koito Manufacturing Co., Ltd. Vehicular lamp having discharge bulb
US6361181B1 (en) 2000-02-28 2002-03-26 Maytag Corporation Appliance with light mounted in door
US7931381B2 (en) * 2008-12-19 2011-04-26 Whirlpool Corporation Lighting system for cooking appliance
DE102015114253B4 (en) 2015-08-27 2017-06-22 Bjb Gmbh & Co. Kg oven light

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DE8711524U1 (en) * 1987-08-25 1987-10-08 Bosch-Siemens Hausgeräte GmbH, 8000 München Electric light for household appliances

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GB963968A (en) * 1962-03-06 1964-07-15 Cibie Pierre Safety device for electric bulbs,more particularly for automobile headlamp bulbs
GB2018055A (en) * 1978-03-31 1979-10-10 Barthelemy L Safety socket connector
DE8711524U1 (en) * 1987-08-25 1987-10-08 Bosch-Siemens Hausgeräte GmbH, 8000 München Electric light for household appliances

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0543448A1 (en) * 1991-11-18 1993-05-26 Koninklijke Philips Electronics N.V. Electric reflector lamp
EP0683367A1 (en) * 1994-05-20 1995-11-22 ELECTROLUX ZANUSSI ELETTRODOMESTICI S.p.A. Lamp holding fixture for a refrigeration apparatus
EP4092837B1 (en) * 2021-05-18 2023-08-16 BJB GmbH & Co. KG Cooking appliance lamp mount with non-riveted contact attachment
US11843207B2 (en) 2021-05-18 2023-12-12 Bjb Gmbh & Co. Kg Lamp socket with non-riveted contact connection

Also Published As

Publication number Publication date
EP0320875B1 (en) 1994-07-27
DE3742509C2 (en) 1992-07-30
EP0320875A3 (en) 1990-05-16
ATE109268T1 (en) 1994-08-15
YU47175B (en) 1995-01-31
US4870546A (en) 1989-09-26
YU226188A (en) 1991-04-30
DE3742509A1 (en) 1989-06-29
ES2056884T3 (en) 1994-10-16
DE3850864D1 (en) 1994-09-01

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