EP0723111B1 - Beleuchtungseinrichtung für Haushaltsgeräte - Google Patents

Beleuchtungseinrichtung für Haushaltsgeräte Download PDF

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Publication number
EP0723111B1
EP0723111B1 EP96100974A EP96100974A EP0723111B1 EP 0723111 B1 EP0723111 B1 EP 0723111B1 EP 96100974 A EP96100974 A EP 96100974A EP 96100974 A EP96100974 A EP 96100974A EP 0723111 B1 EP0723111 B1 EP 0723111B1
Authority
EP
European Patent Office
Prior art keywords
lamp
seal
basic structure
electric
bulb
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
EP96100974A
Other languages
English (en)
French (fr)
Other versions
EP0723111A1 (de
Inventor
Stefano Belfiore
Daniele Cerruti
Costanzo Gadini
Diego Simonelli
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.)
Eltek SpA
Original Assignee
Eltek SpA
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Filing date
Publication date
Application filed by Eltek SpA filed Critical Eltek SpA
Publication of EP0723111A1 publication Critical patent/EP0723111A1/de
Application granted granted Critical
Publication of EP0723111B1 publication Critical patent/EP0723111B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F21V31/00—Gas-tight or water-tight arrangements
    • 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
    • F21V25/12—Flameproof or explosion-proof arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D27/00—Lighting arrangements
    • 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
    • H01R33/965—Dustproof, splashproof, drip-proof, waterproof, or flameproof holders
    • H01R33/9651—Dustproof, splashproof, drip-proof, waterproof, or flameproof holders for screw type coupling devices
    • 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
    • F21W2131/305—Lighting for domestic or personal use for refrigerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/12—Inflammable refrigerants

Definitions

  • the present invention concerns a lampholder device for household appliances, specifically for application in refrigerating appliances as described in the preamble of the appended Claim 1.
  • the main spark source may be generated by the lighting circuit, particularly the lampholder usually located inside the cabinet of the refrigerating appliance.
  • any likely sparks at lampholder level could cause a deflagration.
  • Such a sparking could be due for instance to an uncorrect lamp screwing, a damaged lamp or defective electric contacts of the lampholder.
  • the lamps equipped with E14 standard thread available on the market may differ both for their power (10/15/20 W) and different dimensions and configurations of the glass bulb.
  • an sealing ring is provided, to be inserted on a lampholder, for hermetically closing the latter against the glass bulb of a lamp; according to this solution, a series of chambers are defined between the bulb surface and the ring, for realizing a sort of labyrinth sealing.
  • a lampholder comprising a basic structure made from thermoplastic material, a portion of which defines, in conjunction with the lamp surface, a chamber having the aim of reducing the heat transmission to the lampholder.
  • 1 indicates a lampholder device as a whole, which is part of the lighting device according to the present invention, specifically suitable for application in refrigerating appliances.
  • Said device 1 comprises a basic structure 2 consisting of a standardized lampholder type, known as such, where said structure 2 has a kind of nut-screw to lock a lamp and the related contact and electric connection elements; according to the present invention, some additional components are related to this, basic structure 2 as indicated by 3, 4 and 5 in the various figures, each one of them capable of warranting a different protection degree to the device according to the present invention.
  • 3 indicates a first seal made of flexible material, such as rubber, forming the main element of a protection system for the device according to the present invention.
  • Said first seal 3 is suitable to hermetically enclose the area where a likely loosening of the glass bulb 7 from the screw base 8 of a lamp assembled on the structure 2 may occur.
  • the first seal 3 has a breakthrough area or section for the lamp screw base 8 with teeth 9 made of the same material as seal 3. Said teeth 9 are so configurated in their dimensions and orientation to allow an easy screwing of the lamp and oppose on the other hand an unscrewing of the lamp 7-8 inserted in the structure 2.
  • the seal 3 is manufactured from flexible material and comprises a first upper lip termination 10, which fits flexibly to the various dimensions and configurations of the lamp bulb screwed in the lampholder to obtain a gastight sealing right on the bulb side.
  • the device 1 according to the present invention is shown schematically in figs. 2 and 3 as if it were housing two lamps of different type, corresponding to those illustrated in figs. 9 and 10.
  • the larger bulb shown in fig. 9 is indicated with 7, whereas the smaller bulb for the lamp of fig. 10 is indicated with 7A.
  • 6 and 6A indicate the joining area between the lamp bulb and the screw base.
  • said termination 10 is fit to take different positions according to the bulb geometry of the lamp in use.
  • the seal 3 also comprises a second lower termination 11 as clearly shown in the enlarged detail of Fig. 4. Said second termination 11 fits flexibly to the screw base 8 upon screwing and is suitable to ensure gastightness right on the screw base 8 side facing the lampholder.
  • said terminations 10 and 11 are delimiting an intermediate chamber 12 shown in figs. 2 and 3, to protect the joining area 6 or 6A between the bulb 7 or 7A and the lamp screw base 8 against a possible explosive gas infiltrations.
  • said area is particularly at risk due to a possible loosening of the bulb from the screw base with a consequent sparking within the live electric wires.
  • Said terminations 10 and 11 pressing the external profile also aid to avoid any unwanted loosening of the lamp.
  • the seal 3 comprises a throat 13 towards the outside to insert the seal 3 with interference on the structure 2.
  • both surfaces 14 and 15 opposite the throat 13 are fit to perfectly adhere to the structure 2, thus obtaining a subsequent seal against withdrawal.
  • Said seal can eventually be improved by bonding the parts together or adding an outside band, which is not shown.
  • the seal 3 also has a peripheral seat 16 to fasten a second element 5 of the device according to the present invention, as it will be further described.
  • 20A and 20B indicate two flat surfaces obtained on the external and internal surface of the seal 3, respectively.
  • Said flat surfaces 20A and 20B represent the supporting points of a special assembly tool - not shown in the figures - which provides an axial thrust for the seal 3 to be inserted on the structure 2 without the risk of damaging the parts.
  • FIG. 4 indicates a second seal made of flexible material, which is fit for insertion in the lower side of the basic structure 2.
  • said second seal has two slots 17 and 18, whose dimensions are slightly smaller than the ones of the electric connection terminals of the structure 2, indicated with 19.
  • the seal 4 can be inserted on the lampholder lower side with the terminals 19 forced in the slots 17 and 18.
  • the seal 4 is gastight by adhering to the terminals 19 and to the structure 2, isolating the area where the electric contact elements 21A and 21B of the lamp are shown, assuring a second degree of protection in agreement with the device according to the invention.
  • 5 indicates a third seal or outside housing made of transparent flexible material, such as silicone, which allows a third degree of protection against the risk of cracking for the lamp glass bulb 7 or 7A.
  • said outside housing 5 configurated as a cap is inserted over the bulb 7 or 7A and on the first seal 3.
  • the outside housing 5 has a termination 5A configurated as an O-ring type seal, fit to engage the peripheral seat 16 of the first seal 3. Therefore the housing 5 can be inserted over the lamp bulb and enclose it completely to warrant the required airtightness.
  • the housing 5 based on the type of lamp inserted in the structure 2 can aid to avoid any unwanted lamp loosening.
  • actuation means of the device 1 are provided according to the invention, located on a doorpost of the cabinet containing the refrigerating appliance.
  • the purpose of said actuation means which may consist eg. of a push-button switch - not shown in the figure for simplicity ⁇ s sake - is to detect the opening and closing of the door and consequently control the switching on and off of the lamp screwed in the lampholder.
  • the seals 3 and 4 are inserted over the basic structure 2 consisting practically of a substantially standardized lampholder type as mentioned above.
  • the seal 4 is forced on the electric connection terminals 19 of the lampholder through the slots 17 and 18 to warrant gastigthness on that side and specifically in the electric contacting area 21, whereas the seal 3 is inserted over the part where the lamp will be fastened through the throat 13, using the above mentioned assembly tool.
  • the lamp is screwed as usual in the lampholder. Due to the existing seal 3, at least a part of the lamp screw-base 8 is located within the teeth 9 suitable to hinder a loosening of the lamp.
  • lip termination 10 of the seal 3 warps flexibly against the lamp bulb 7 or 7A to warrant the sealing on that side.
  • the second termination 11 of that same seal 3 warrants on the other hand a gastightness in the lower side of the joining area 6 between the lamp bulb and the screw base.
  • a gastight chamber 12 is practically formed between lip termination 10 and termination 11 to protect against a likely loosening of the bulb from the screw base.
  • the outside housing 5 made of transparent flexible material is inserted over the lamp and fits to the bulb 7 or lamp 7A geometry. Said housing 5 is fastened through its end section 5A having the form of an O-ring seal, which mates with the relevant peripheral seat 16 of the seal 3; as a result a further protection related to the possibility of a lamp bulb cracking is warranted.
  • teeth 9 are provided to hinder any unwanted lamp unscrewing; to this purpose both the seal 3 and teeth 9 are designed to require at least 0.3 N.m unscrewing torque. Obviously, this does not hinder a manual unscrewing of the lamp.
  • One of the main advantages according to the present invention is the possibility of converting a conventional lampholder (2) in an airtight lampholder (1) in a rather simple and low-cost manner, whose application is especially beneficial in the field of the refrigerating appliances, and which is suitable to warrant three different airtightness degrees:
  • the special design of this same device according to the present invention avoids the risk of casual lamp unscrewing; on the other hand its gastightness and resistance to undesired loosening does not hinder a replacement of the lamp.
  • the advantages of the present invention appear clear in terms of design simplification and manufacturing standardization, since the manufacturer can use the same lampholder basic structure 2 both for the applications that do not require airtight sealing and for those where such a sealing is required. To this purpose it should also be mentioned how the device can flexibly fit the various geometrical configurations of the lamps available, i.e. using the same components all time.
  • the main sparks source can be represented by the lighting circuit, which besides the lampholder also has a push-button switch located on the doorpost of the refrigerator cabinet. Therefore, if the refrigerator is saturated with explosive gas, also the likely sparks due to the closing of said push-button may cause a deflagration when opening the door. Therefore, a special advantageous embodiment of the present invention is provided with an airtight push-button whose electric contacts are isolated from the sorrounding environment by an adequate airtight housing enclosing them.
  • the device described above by way of example can find application in other fields other than refrigeration, i.e. wherever an airtight protection on one or more lampholder areas is required; for instance, the device described herein can be used on washing-machines, such as laundry-washers, eg. for lighting inside the washing tank, i.e. with the purpose of isolating the electric parts of the lighting system inside the washing tank and avoid humidity and water infiltrations.
  • washing-machines such as laundry-washers, eg. for lighting inside the washing tank, i.e. with the purpose of isolating the electric parts of the lighting system inside the washing tank and avoid humidity and water infiltrations.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Claims (13)

  1. Eine Beleuchtungseinrichtung, insbesondere für Haushaltsgeräte, welche eine einen Glaskolben (7, 7A) und einen Schraubsockel (8) aufweisendes Leuchtmittel aufnehmen kann, umfassend
    einen Grundaufbau (2), an dem Mittel zur Verschraubung des Leuchtmittels und Kontakt- und elektrische Verbindungsmittel (19, 21A, 21B) vorgesehen sind,
    zusätzliche Mittel (3, 4, 5) in Gestalt einer in den Grundaufbau (2) einzusetzenden Dichtung, um einen oder mehr Bereiche des Grundaufbaus (2) und/oder des darin montierten Leuchtmittels zum Zwecke des Schutzes vor Infiltrationen hermetisch abzuschließen,
    wobei die zusätzlichen Mittel (3, 4, 5) wenigstens eine erste Dichtung (3), die aus einem flexiblen Material hergestellt ist und wenigstens zwei Anteile (10, 11), welche in Verbindung mit dem Leuchtmittel eine abgeschlossene Kammer (12) begrenzen, wobei ein erster Anteil (10) der Anteile (10, 11) flexibel an dem Glaskolben (7, 7A) anliegt und dadurch eine erste luftdichte Abdichtung an dem Leuchtmittel darstellt, umfassen,
    dadurch gekennzeichnet, dass die Kammer (12) vorgesehen ist, um den Verbindungsbereich (6, 6A) zwischen dem Glaskolben (7, 7A) und dem Schraubsockel (8) hermetisch zu umschließen, nachdem das Leuchtmittel in den Grundaufbau (2) montiert wurde, wobei ein zweiter Anteil (11) der Anteile (10, 11) flexibel an dem Schraubsockel (8) anliegt und dadurch eine zweite luftdichte Abdichtung an dem Leuchtmittel erreicht.
  2. Einrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die zusätzlichen Mittel (3, 4, 5) auch vorgesehen sind, um ein unerwünschtes Losschrauben des in dem Grundaufbau (2) montierten Leuchtmittels (7, 7A, 8) zu verhindern.
  3. Einrichtung nach Anspruch 2,
    dadurch gekennzeichnet, dass die erste Dichtung (3) einen Durchgangsbereich oder -abschnitt für den Schraubsockel (8) des Leuchtmittels aufweist, dass der Durchgangsbereich Zähne (9) umfasst, deren Größe und Ausrichtung so gestaltet ist, dass sie ein einfaches Einschrauben des Leuchtmittels erlauben und einen Widerstand gegen das Ausschrauben des Leuchtmittels darstellen.
  4. Einrichtung nach Anspruch 3,
    dadurch gekennzeichnet, dass der Durchgangsbereich oder -abschnitt unterhalb des zweiten Anteils (11) ausgebildet ist.
  5. Einrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die erste Dichtung (3) eine Einschnürung (13) zur Befestigung am Grundaufbau aufweist, wobei die Befestigung der zwei Bauteile insbesondere durch Verklebung und/oder das Hinzufügen eines äußeren Bandes verbessert wird.
  6. Einrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die zusätzlichen Mittel (3, 4, 5) eine zweite Dichtung (4) zur hermetischen Verschließung des Bereichs der elektrischen Kontakte (21A, 21B) zwischen dem Leuchtmittel und dem Grundaufbau (2) umfassen.
  7. Einrichtung nach Anspruch 6,
    dadurch gekennzeichnet, dass die zweite Dichtung (4) wenigstens einen Schlitz (17, 18) zum kraftvollen Aufschub auf wenigstens eine Anschlussklemme (19) des Grundaufbaus (2) aufweist, wobei die zweite Dichtung (4) zur Erzielung des erforderlichen luftdichten Abschlusses an dem Anschlussstück (19) und dem Grundaufbau (2) anhaftet.
  8. Einrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass die zusätzlichen Mittel (3, 4, 5) ein äußeres Gehäuse (5) umfassen, welches insbesondere aus einem transparenten flexiblen Material, wie Silikon, hergestellt ist, zur hermetischen Umschließung des Kolbens (7, 7A) des in dem Grundaufbau (2) montierten Leuchtmittels (7, 7A).
  9. Einrichtung nach Anspruch 8,
    dadurch gekennzeichnet, dass das externe Gehäuse (5) über den Kolben (7, 7A) geschoben ist und ihn vollkommen umschließt und teilweise über die erste Dichtung (3) geschoben ist, wobei das äußere Gehäuse (5) insbesondere ein Ende (5A), welches in einem in der ersten Dichtung (3) ausgebildeten äußeren Sitz (16) eingreift, aufweist.
  10. Einrichtung nach Anspruch 9,
    dadurch gekennzeichnet, dass das äußere Gehäuse dafür vorgesehen ist, ein ungewolltes Ausschrauben des Leuchtmittels zu vermeiden.
  11. Einrichtung nach mindestens einem der vorigen Ansprüche,
    dadurch gekennzeichnet, dass ein das Leuchtmittel betätigender Schalter vorgesehen ist, insbesondere um das Öffnen und Schließen einer Tür zu ermitteln und hieraus folgend die Einschaltung des Leuchtmittels zu kontrollieren, wobei die elektrischen Kontakte des Schalters von der Umgebung durch ein sie umgebendes luftdichtes Gehäuse isoliert sind.
  12. Verwendung der Vorrichtung nach mindestens einem der vorigen Ansprüche zur Beleuchtung des Inneren von Kühlgeräten oder Waschmaschinen.
  13. Ein Kühlgerät mit einem Gehäuse und einem Kühlkreislauf und stromführenden elektrischen Betriebsmitteln innerhalb des Gehäuses, umfassend eine Beleuchtungsvorrichtung nach Anspruch 1 und vorzugsweise auch einen Leuchtmittelbetätigungsschalter, wobei der Kühlkreislauf ein Gas verwendet, welches unter bestimmten Fehldienungsbedingungen zur Explosion fähig ist,
    dadurch gekennzeichnet, dass die elektrischen Mittel von entsprechenden luftdichten Gehäusen umschlossen sind, welche verhindern, dass möglicherweise aus dem Kühlkreislauf austretende Gase irgendwelche stromführenden elektrischen Teile der elektrischen Mittel erreichen.
EP96100974A 1995-01-24 1996-01-24 Beleuchtungseinrichtung für Haushaltsgeräte Expired - Lifetime EP0723111B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95TO000040A IT1280798B1 (it) 1995-01-24 1995-01-24 Dispositivo di illuminazione per apparati elettrodomestici.
ITTO950040 1995-01-24

Publications (2)

Publication Number Publication Date
EP0723111A1 EP0723111A1 (de) 1996-07-24
EP0723111B1 true EP0723111B1 (de) 2001-11-21

Family

ID=11413094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100974A Expired - Lifetime EP0723111B1 (de) 1995-01-24 1996-01-24 Beleuchtungseinrichtung für Haushaltsgeräte

Country Status (4)

Country Link
EP (1) EP0723111B1 (de)
DE (1) DE69617062T2 (de)
ES (1) ES2168398T3 (de)
IT (1) IT1280798B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI321211B (en) * 2003-06-30 2010-03-01 Sanyo Electric Co Interior lamp socket and refrigerator using the same
GB2461846A (en) * 2008-07-10 2010-01-20 Hector Finch Lights suitable for use in potentially hazardous areas
CN104165433A (zh) * 2013-05-16 2014-11-26 黄大信 冷媒防爆视窗
CN109114876B (zh) * 2018-08-01 2020-06-16 徐州鹰格电子技术有限公司 一种防湿气进入的高密封性冷库灯

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB489080A (en) * 1936-11-03 1938-07-19 British Thomson Houston Co Ltd Improvements in and relating to refrigerator cabinets
NL6400919A (de) * 1964-02-05 1965-08-06
US3728663A (en) * 1971-08-03 1973-04-17 Lyall Electric Flexible lampholder
SE435757B (sv) * 1981-05-12 1984-10-15 Sedaplast Ab Tetningsanordning for avtetning av lamphallare
IT231977Y1 (it) * 1993-09-22 1999-08-10 Zanussi Elettrodomestici Apparecchio frigorifero con lampada perfezionata

Also Published As

Publication number Publication date
EP0723111A1 (de) 1996-07-24
ITTO950040A1 (it) 1996-07-24
ITTO950040A0 (it) 1995-01-24
DE69617062T2 (de) 2002-07-11
ES2168398T3 (es) 2002-06-16
IT1280798B1 (it) 1998-02-11
DE69617062D1 (de) 2002-01-03

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