EP0683367B1 - Lamp holding fixture for a refrigeration apparatus - Google Patents
Lamp holding fixture for a refrigeration apparatus Download PDFInfo
- Publication number
- EP0683367B1 EP0683367B1 EP95105811A EP95105811A EP0683367B1 EP 0683367 B1 EP0683367 B1 EP 0683367B1 EP 95105811 A EP95105811 A EP 95105811A EP 95105811 A EP95105811 A EP 95105811A EP 0683367 B1 EP0683367 B1 EP 0683367B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- holding fixture
- contact
- opening
- terminal
- 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
Links
- 238000005057 refrigeration Methods 0.000 title claims description 16
- 238000007789 sealing Methods 0.000 claims description 15
- 238000003860 storage Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- 239000004020 conductor Substances 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 2
- 239000013013 elastic material Substances 0.000 claims description 2
- 239000003507 refrigerant Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 238000004880 explosion Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000002937 thermal insulation foam Substances 0.000 description 1
Images
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
- H01R33/965—Dustproof, splashproof, drip-proof, waterproof, or flameproof holders
- H01R33/9651—Dustproof, splashproof, drip-proof, waterproof, or flameproof holders for screw type coupling devices
- H01R33/9653—Dustproof, splashproof, drip-proof, waterproof, or flameproof holders for screw type coupling devices neither pole becoming electrically connected until the coupling parts are substantially engaged
-
- 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
- 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
- H01R13/447—Shutter or cover plate
- H01R13/453—Shutter or cover plate opened by engagement of counterpart
- H01R13/4534—Laterally sliding shutter
-
- 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
-
- 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
- H01R33/945—Holders with built-in electrical component
- H01R33/96—Holders with built-in electrical component with switch operated by engagement or disengagement of coupling
- H01R33/962—Holders with built-in electrical component with switch operated by engagement or disengagement of coupling for screw type coupling devices
Definitions
- the present invention refers to a lamp-holding fixture for a refrigeration apparatus.
- the present invention refers to a lamp-holding fixture which can be used with all types of refrigeration apparatuses, particularly of the household or residential type, which are provided with at least a food storage compartment, a lamp for the internal lighting of said food storage compartment and a refrigerating circuit, of which a portion, typically the evaporator, is at least partly housed inside said food storage compartment, said refrigerating circuit being filled with an inflammable gas, such as for instance methane or butane.
- an inflammable gas such as for instance methane or butane.
- the following description will refer to a refrigeration apparatus with a single food storage compartment, but it will be appreciated that the invention extends to also cover a lamp-holding fixture for refrigeration apparatuses that may be provided with several food storage compartments and related evaporators and internal lighting lamps.
- refrigeration appliances have been developed in which the refrigerant or working fluid is made up by a gas or a mixture of gases that do not feature any significant ozone-depletion potential, but are in many cases inflammable.
- terminals that supply the power to said lamps are to be given such an explosion-proof quality, which is an obvious consideration since it would be perfectly useless to adopt explosion-proof lamps, if their power-supply terminals are anyway capable of triggering an explosion, then such terminals shall be unremovably locked or fixed to the lamp's own terminals or the screw attachment or cap thereof, so as to positively exclude the possibility of sparks being ever generated.
- the lead wire that branches off said terminals shall be in turn connected to the power delivering points within the refrigeration apparatus in such a manner as to ensure full safety as far as said explosion hazards are concerned.
- the refrigeration apparatus should of course be capable of keeping operating. In such a case, the presence of live terminals which become exposed through the removal of the lamp would undoubtedly constitute a hazardous situation.
- a lamp-holding fixture for a refrigeration apparatus such as in particular a household refrigerator or freezer, which is equipped with a lamp
- said lamp and said lamp-holding fixture having an explosion-proof construction, wherein the lamp is readily removable from its holding fixture even by relatively unskilled persons, whereas the lamp-holding fixture itself cannot represent a hazard situation even when the lamp is removed therefrom, without this involving a more complicated construction or the use of new, not readily available techniques, while keeping production costs at a quite low level.
- the devised solution to the afore cited problems substantially consists in providing a lamp-holding fixture 1 having a box-like, sealed construction, with a single recess 2 provided for the insertion of the cap 3 of the lamp 4.
- Said cap is provided with at least an electric power-supply terminal for the lamp, and the contact between said terminal and the corresponding power-supply member occurs in a sealed chamber which is impervious to the gas around it and is a part of said lamp-holding fixture, said electric contacts between the lamp terminals and the corresponding power supply terminals taking therefore place in the inner volume of said chamber.
- said cap is provided with two prominent, parallel terminals 5, 6 connected to the lighting element (not shown) inside the lamp.
- said lamp-holding fixture On a closed wall 7 arranged in front of said recess 2, said lamp-holding fixture is provided with two guiding provisions 8, 9, having preferably a conical shape and arranged at an equal distance with respect to said respective terminals 5, 6.
- Each one of said two guiding provisions 8, 9 terminates with a small opening 10, 11, respectively, which is just sized to allow for the passage therethrough of the respective terminal of the lamp, whereas beyond said opening there is arranged a shiftable element 12, 13, respectively, adapted to close the respective opening 10, 11 by displacing transversally with respect to the respective opening owing to the action of a respective spring element 14, 15.
- respective contact elements 18, 19 having preferably the form of an elastic blade, in such a position as to be able to come into contact with said respective terminals when inserted full-depth in the respective openings.
- said element are provided, on their end portion facing the lamp, with two respective guiding provisions 20, 21, which are preferably made by bending the corresponding contact elements accordingly, the latter being firmly connected to the power-supply lead wires.
- said shiftable elements 12, 13 are provided, in correspondence of their portion closing said corresponding openings, with respective oblique sides 22, 23 facing said respective openings.
- the box-shaped lamp-holding fixture 1 has therefore a fully sealed construction and, when applied on to the inner wall of the food storage compartment that must be lighted, it further seals up in an air-tight manner its inner volume, with particular reference to its inner volume 25 that houses the contact surfaces of said terminals and said corresponding contact elements 18, 19.
- Such a ring is elastic and preferably made of an elastomeric material, so that, when the lamp is removed, the two shiftable elements 12 and 13, by moving forward due to the action of their respective spring elements, go pushing against said sealing ring 26, thereby ensuring a perfectly air-tight sealing of said inner volume 25.
- a second embodiment of the present invention is illustrated in the Figures 4 to 6.
- the inner air-tight volume 25 of the lamp-holding fixture can be seen to contain a first moving electric terminal 31 which is substantially cylindrical in its shape and passes slidingly through an appropriate air-tightly sealable opening of said inner volume, said terminal being further adapted to come into contact with the lower contact point 32 of a traditional screw-attachment type lamp which is screwed on a corresponding threaded attachment 33 in a traditional manner.
- a conductive terminal 35 which is adapted to rotate about an appropriate pin 36, which is also arranged within said air-tight inner volume, owing to a pushing effect applied at the opposite end 37 by said conductor 35.
- Said opposite end is adapted to be shifted by an elastic relief 38 which is a part of the elements provided to ensure air-tight sealing of the inner volume 25, said elastic relief 38 being in turn shiftable by a moving element 39 actuated by the door-actuated switch.
- the second electric contact is supplied by a side terminal 31B, which protrudes from the threaded wall of the lamp-holder and comes into contact with the threaded attachment or conductive cap 33 of the lamp.
- Said second electric contact 31B enters said inner volume 25 through an elastic air-tight sealing gasket 50, while, inside said inner volume 25, the other end portion of said electric contact 31B is capable of coming into releasable contact with a conductor 45B connected to the other polarity of the power supply.
- Said elastic air-tight sealing gasket and said electric contacts 31B and 45B are arranged and shaped in such a manner as to ensure that, when the lamp is fully screwed in, its threaded portion 33 establishes a contact with said electric contact 31B and pushes it so that the latter, by moving inwards, ultimately establishes a contact, with its opposite end portion, with the conductor 45B.
- the outer portion 40 of the recess provided to accomodate the lamp is made of an elastic material and is in the shape of an inwardly oriented frustum of a cone. Additionally, the inside diameter of said outer portion 40 for the passage of the lamp is so sized as to be able to elastically interfere with the bulb of the lamp when the latter is being screwed on into its seat, so that an inflammable atmosphere being possibly present in the compartment is positively prevented from reaching the attachment edge 41 between the bulb of the lamp and the cap 42 thereof.
- the points of mutual contact between live conductors are between the contact 31B and the conductor 45B, as well as between the passing-through terminal 31 and the terminal 35, ie. both of them occur within the inner volume 25 so as to ensure a complete isolation from the outside atmosphere, excluding all related hazards even in the case of sparks being generated between said electric contacts.
- lamp-holding fixtures according to the present invention may also be provided in forms and shapes that differ from the ones described above, without departing from the scope of the present invention as defined in the claims.
Description
- The present invention refers to a lamp-holding fixture for a refrigeration apparatus.
- In particular, the present invention refers to a lamp-holding fixture which can be used with all types of refrigeration apparatuses, particularly of the household or residential type, which are provided with at least a food storage compartment, a lamp for the internal lighting of said food storage compartment and a refrigerating circuit, of which a portion, typically the evaporator, is at least partly housed inside said food storage compartment, said refrigerating circuit being filled with an inflammable gas, such as for instance methane or butane.
- For reasons of greater simplicity, the following description will refer to a refrigeration apparatus with a single food storage compartment, but it will be appreciated that the invention extends to also cover a lamp-holding fixture for refrigeration apparatuses that may be provided with several food storage compartments and related evaporators and internal lighting lamps.
- It is a largely known fact that the pressure exerted by the public opinion in favour of increasingly environment-friendly products, ie. products that must be environmentally sustainable even after they are discarded at the end of their life cycle, has had both directly and indirectly an impact on industry as a whole, inducing it to develop products that are capable of meeting such environment-oriented requirements to an ever greater extent. In this connection, a direct impact is unfolding through a clear trend which is discernible among consumers in general, who seem to increasingly favour so-called "ecological" or green products, putting environment-friendliness on top of their purchase criteria, as stimulated by press and advertising campaigns that are quite qften made on purpose, ie. for reasons of self-interest. On the other hand, an indirect impact is being produced by the setting up and the imposition of a whole set of regulatory, manufacturing and product design obligations aiming at gradually marginalizing products that are not considered or perceived as being adequately ecological.
- It is basically for this second reason that all types of refrigeration apparatuses making use of chlorofluorocarbons (CFCs) as blowing agents in their thermal insulation foams have been phased out, or are now being phased out, from production by the manufacturers in the most advanced countries of this world, while the public opinion is clearly showing a general sensitiveness for and interest in the purchase of refrigerators that do not contain chlorofluorocarbons at all, ie. not even as working fluids in the refrigeration circuit.
- As a consequence, refrigeration appliances have been developed in which the refrigerant or working fluid is made up by a gas or a mixture of gases that do not feature any significant ozone-depletion potential, but are in many cases inflammable.
- In order to avoid any risk of explosion in the case of such gases leaking into the closed compartment containing the stored food, particular configurations have been proposed for the internal lighting lamps, which, even if broken, do not trigger an ignition of a gas mixture that could possibly be around there.
- In this connection, reference should be made to the Italian application for a utility model no. PN93U000024.
- It has been however observed that, even if such lamps are effectively protected against the risk of their breakage turning them into a cause of ignition of a possible inflammable gas mixture, the same lamps must in any case be such as to be able of being replaced in the case of a malfunction or a breakage.
- If also the terminals that supply the power to said lamps are to be given such an explosion-proof quality, which is an obvious consideration since it would be perfectly useless to adopt explosion-proof lamps, if their power-supply terminals are anyway capable of triggering an explosion, then such terminals shall be unremovably locked or fixed to the lamp's own terminals or the screw attachment or cap thereof, so as to positively exclude the possibility of sparks being ever generated. Furthermore, the lead wire that branches off said terminals shall be in turn connected to the power delivering points within the refrigeration apparatus in such a manner as to ensure full safety as far as said explosion hazards are concerned.
- It is of course fully possible to implement all such precautionary measures, but this anyway involves an intervention of adequately skilled personnel to perform the related operations, as well as to possibly replace not only the lamp, which, as already noted, is not separable from its holding fixture, but also the lamp-holding fixture and the related lead wires.
- In practice, it would be impossible for an average user, ie. a person with an average degree of skill and ability, to replace the lamp, while the compulsory intervention of an external serviceman would bring about unreasonably high costs if related to the value of the apparatus and the actual cost of the lamp itself.
- Furthermore, even in the case that a defective lamp has to be removed, without being able or wishing to immediately replace it with a new one, the refrigeration apparatus should of course be capable of keeping operating. In such a case, the presence of live terminals which become exposed through the removal of the lamp would undoubtedly constitute a hazardous situation.
- It would therefore be desirable, and it actually is a main purpose of the present invention, to provide a lamp-holding fixture for a refrigeration apparatus, such as in particular a household refrigerator or freezer, which is equipped with a lamp, said lamp and said lamp-holding fixture having an explosion-proof construction, wherein the lamp is readily removable from its holding fixture even by relatively unskilled persons, whereas the lamp-holding fixture itself cannot represent a hazard situation even when the lamp is removed therefrom, without this involving a more complicated construction or the use of new, not readily available techniques, while keeping production costs at a quite low level.
- These aims are reached by a lamp-holding fixture as defined in the appended claims.
- To provide a better insight into the present invention, this will be described more in detail below by way of non-limiting examples with reference to the accompanying drawings, in which:
- Figure 1 is a cross-sectional view illustrating schematically the structure of a lamp-holding fixture according to the present invention, as shown without the lamp;
- Figure 2 is the same cross-sectional view as described in connection with Figure 1, however with the lamp mounted in place;
- Figure 3 is an enlarged view of a portion of the cross-section shown in Figure 2;
- Figure 4 is a view of a second embodiment of a lamp-holding fixture according to the present invention;
- Figure 5 is a view of the lamp-holding fixture shown in Figure 4, however without the lamp mounted in place;
- Figure 6 is a second cross-sectional view of the lamp-holding fixture appearing in Figure 4.
- The following description will be referred, by mere way of example and for reasons of greater simplicity, to a refrigeration apparatus with single refrigerated storage compartment lighted by a single lamp. It will be however appreciated that what is here described and claimed similarly applies to any type of refrigeration apparatus, regardless of the number of food storage compartments and internal lighting lamps used.
- The devised solution to the afore cited problems substantially consists in providing a lamp-
holding fixture 1 having a box-like, sealed construction, with asingle recess 2 provided for the insertion of the cap 3 of thelamp 4. Said cap is provided with at least an electric power-supply terminal for the lamp, and the contact between said terminal and the corresponding power-supply member occurs in a sealed chamber which is impervious to the gas around it and is a part of said lamp-holding fixture, said electric contacts between the lamp terminals and the corresponding power supply terminals taking therefore place in the inner volume of said chamber. - According to a first embodiment of the present invention, as illustrated in the accompanying Figures 1, 2 and 3, said cap is provided with two prominent,
parallel terminals 5, 6 connected to the lighting element (not shown) inside the lamp. - On a closed
wall 7 arranged in front of saidrecess 2, said lamp-holding fixture is provided with two guiding provisions 8, 9, having preferably a conical shape and arranged at an equal distance with respect to saidrespective terminals 5, 6. - Each one of said two guiding provisions 8, 9 terminates with a
small opening shiftable element respective opening respective spring element - By moving further on into the inner side of said lamp-holding fixture, it is possible to find, beyond said shiftable element provided to close said respective opening, two
respective housings 16, 17 having a elongated shape and provided there in an aligned arrangement with respect to the respective openings, said housings being such as to be capable of accomodating said respective terminals. - Along said respective housings there are arranged two
respective contact elements - In view of facilitating such contact, said element are provided, on their end portion facing the lamp, with two respective guiding
provisions 20, 21, which are preferably made by bending the corresponding contact elements accordingly, the latter being firmly connected to the power-supply lead wires. - Finally, said
shiftable elements oblique sides - The box-shaped lamp-
holding fixture 1 has therefore a fully sealed construction and, when applied on to the inner wall of the food storage compartment that must be lighted, it further seals up in an air-tight manner its inner volume, with particular reference to itsinner volume 25 that houses the contact surfaces of said terminals and saidcorresponding contact elements - In order to ensure a most reliable air-tight sealing of said
inner volume 25, it is advantageous to provide a flexibleinner sealing ring 26, arranged to face the oblique sides of saidshiftable elements - Such a ring is elastic and preferably made of an elastomeric material, so that, when the lamp is removed, the two
shiftable elements ring 26, thereby ensuring a perfectly air-tight sealing of saidinner volume 25. - The operation of the above described arrangements is as follows: if it is assumed that the lamp-holding fixture is installed correctly and the lamp is not inserted therein, but is on the contrary removed from its seat (Figure 1), in such a case the two
shiftable elements respective spring elements respective openings contact elements - Such an air-tight sealing action is ensured in a particularly effective manner by the
elastic ring 26 or similar means which, being arranged in front of saidshiftable elements respective openings - When the lamp is then introduced in its seat, with its cap entering the
recess 2, theterminals 5 and 6, as guided by the respective guiding provisions 8 and 9, go striking and then pushing against theoblique sides housings 16, 17 to complete their insertion, come into contact with thecorresponding contact elements provisions 20, 21 which practically guide them into slidingly position themselves in a side-by-side arrangement between saidterminals 5, 6 and said corresponding contact elements (Figure 2). - When the lamp needs to be replaced, it will be sufficient to pull it out using just the force that is required to overcome the force of friction existing between said terminals and the respective contacts, as well as between the same terminals and the
shiftable elements shiftable elements - A second embodiment of the present invention is illustrated in the Figures 4 to 6.
- With particular reference to Figure 4, the inner air-
tight volume 25 of the lamp-holding fixture can be seen to contain a first movingelectric terminal 31 which is substantially cylindrical in its shape and passes slidingly through an appropriate air-tightly sealable opening of said inner volume, said terminal being further adapted to come into contact with thelower contact point 32 of a traditional screw-attachment type lamp which is screwed on a corresponding threadedattachment 33 in a traditional manner. - In a frontal position with respect to the
inner portion 34 of said moving electric contact there is arranged aconductive terminal 35, which is adapted to rotate about anappropriate pin 36, which is also arranged within said air-tight inner volume, owing to a pushing effect applied at theopposite end 37 by saidconductor 35. - Said opposite end is adapted to be shifted by an
elastic relief 38 which is a part of the elements provided to ensure air-tight sealing of theinner volume 25, saidelastic relief 38 being in turn shiftable by a movingelement 39 actuated by the door-actuated switch. - The second electric contact is supplied by a
side terminal 31B, which protrudes from the threaded wall of the lamp-holder and comes into contact with the threaded attachment orconductive cap 33 of the lamp. - Said second
electric contact 31B enters saidinner volume 25 through an elastic air-tight sealing gasket 50, while, inside saidinner volume 25, the other end portion of saidelectric contact 31B is capable of coming into releasable contact with aconductor 45B connected to the other polarity of the power supply. - Said elastic air-tight sealing gasket and said
electric contacts portion 33 establishes a contact with saidelectric contact 31B and pushes it so that the latter, by moving inwards, ultimately establishes a contact, with its opposite end portion, with theconductor 45B. - When the lamp is removed, as it is shown in Figure 5, said contact 31B, which is no longer pushed by the threaded portion of the lamp, moves forward owing to the effect of the
elastic sealing gasket 50, thereby separating its opposite end portion from saidconductor 45B and, as a result, isolating itself from its power supply source. - With reference to Figure 5, where the same lamp-holding fixture is illustrated without a lamp mounted, it should be noticed that the
outer portion 40 of the recess provided to accomodate the lamp is made of an elastic material and is in the shape of an inwardly oriented frustum of a cone. Additionally, the inside diameter of saidouter portion 40 for the passage of the lamp is so sized as to be able to elastically interfere with the bulb of the lamp when the latter is being screwed on into its seat, so that an inflammable atmosphere being possibly present in the compartment is positively prevented from reaching theattachment edge 41 between the bulb of the lamp and thecap 42 thereof. - In this way, even considering the possibility of a breakage occurring in correspondence of said attachment edge, the air-tight sealing effect ensured by said
outer portion 40 of the recess acting against the bulb of the lamp, makes it possible to use any type of lamp, and not special explosion-proof lamps only. - With reference to Figure 6, which illustrates a cross-sectional view taken orthogonally with respect to the cross-section illustrated in Figure 4, it should be noticed that an
elastic element 43 is applied between the body of the lamp-holder and said passing-throughelectric terminal 31. When in a resting state, ie. when no lamp is mounted, the elastic action exerted by saidelement 43 on the passing-throughelectric terminal 31 causes the latter to take a position in which it is situated out of saidinner volume 25. - The operation of such a lamp-holding fixture is as follows: when the lamp is removed (Figure 5), the
elastic element 43 causes theinner portion 34 of the passing-through movingterminal 31 to move away from theconductive terminal 35, while the air-tight construction of the conduit in which said passing-throughterminal 31 is sliding ensures that there are no infiltrations of gas into saidinner volume 25, so that there is no possibility for situations capable of triggering an explosion to occur inside said volume. - A similar condition occurs, as described above, for the
other contact 31B, so that said passing-through movingterminal 31 and saidcontact 31B are both isolated from their power supply source and, as a result, are not able to give rise to explosion triggering hazards when the lamp is removed. - When the lamp is on the contrary mounted, the point of
contact 32 of the lamp goes pushing against the head portion of the passing-through terminal 31, thereby causing it to move inwardly up to the point in which its inner end portion comes into contact with theconductive terminal 35 that is permanently connected to the power supply through a furtherelastic contact 45. A similar condition occurs for thecontact 31B with respect to the screw cap of the lamp, as described previously, so that the lamp can now be supplied correctly. - Furthermore, the points of mutual contact between live conductors are between the
contact 31B and theconductor 45B, as well as between the passing-throughterminal 31 and the terminal 35, ie. both of them occur within theinner volume 25 so as to ensure a complete isolation from the outside atmosphere, excluding all related hazards even in the case of sparks being generated between said electric contacts. - When the door of the refrigeration apparatus is closed, the
related lever 39 is caused to act against theelastic sealing element 38, which, yielding to said force, moves forward until it abuts against theend portion 37 of theconductive terminal 35 which, by acting as a lever about thepin 36, moves said terminal away from theinner end portion 34 of said passing-throughelectric terminal 31, thereby cutting the power supply to the lamp. However, the spark that can possibly be generated between said terminals when they separate, would occur within theinner volume 25 which, being sealed off the outer atmosphere in an air-tight manner, would not give rise to any explosion triggering hazard. - As a result, following advantages are reached with the present invention:
- a) possibility to mount and remove the lamp by the user, without the need arising for calling a serviceman;
- b) rapidity in establishing the connection between the lamp and the related power-supply circuit;
- c) use of regular, commercially available lamps;
- d) possibility of using the refrigeration apparatus even without a lamp being mounted in the lamp-holding fixture of the food storage compartment;
- e) overall cost-effectiveness of the proposed construction, and possibility of using simple, reliable and readily available techniques.
-
- It will of course be appreciated that lamp-holding fixtures according to the present invention may also be provided in forms and shapes that differ from the ones described above, without departing from the scope of the present invention as defined in the claims.
Claims (13)
- Lamp-holding fixture for a refrigeration apparatus, in particular a household refrigerator or freezer, comprising one or more refrigerating circuits filled with inflammable refrigerant gases and including at least a compressor, a condenser, one or more evaporators associated to one or more food storage compartments, said food storage compartments being illuminated by at least an incandescent lamp supported by a respective lamp-holding fixture (1), characterized in that said lamp-holding fixture comprises an inner volume (25) which is sealed off the outside environment in an air-tight manner, and that inside said inner volume there is provided at least a terminal (18, 35) adapted to establish a contact with or become separated from electrical lead wires connected with the power supply circuit of the lamp.
- Lamp-holding fixture according to claim 1, characterized in that said inner volume (25) is provided with at least an opening (10), a shiftable element (12) being arranged inside said opening so as to be able to close said opening due to the action of a spring element (14), said shiftable element being further adapted to slide so as to open said opening due to the action of a lamp terminal (5) that pushes against said shiftable element, at least a contact element (18) being further arranged inside said lamp-holding fixture substantially in a line with said opening (10).
- Lamp-holding fixture according to claim 2, characterized in that said at least a shiftable element (12) is provided, in correspondence of its portion obstructing said opening (10), with an oblique side (22) facing said opening.
- Lamp-holding fixture according to claim 2 or 3, characterized in that said opening (10) is provided with guiding means (8), which may have a conical shape, adapted to facilitate the introduction of said lamp terminal (5) in said opening.
- Lamp-holding fixture according to any of the preceding claims from 2 to 4, characterized in that it is provided internally with a housing (16) having an elongated shape and provided there in an aligned arrangement with respect to said opening, and that along said housing there is arranged a contact element (18) having preferably the form of an elastic blade and provided, at its end portion facing said opening, with a guiding means (20) formed preferably by bending.
- Lamp-holding fixture according to any of the preceding claims from 2 to 5, characterized in that said shiftable element (12) is adapted to slide in an orthogonal direction with respect to the axis of said opening.
- Lamp-holding fixture according to any of the preceding claims from 2 to 6, characterized in that there are provided elastic means (26) that are adapted to elastically and sealingly stop the movement of said shiftable elements (12) by sustaining the force exerted by said oblique side (22) when said lamp is removed.
- Lamp-holding fixture according to any of the preceding claims from 2 to 7, characterized in that in correspondence of the side containing said opening there is provided a recess (2) adapted to accomodate the cap (3) of a lamp (4) in such a manner that said lamp terminal (5) is able to get inserted in said opening (10).
- Lamp-holding fixture according to claim 1, characterized in that said inner volume (25) contains a first electric moving terminal (31) passing slidingly through an appropriate air-tightly sealing opening in said inner volume and adapted to come into contact with the lower point of contact (32) of a lamp that is screwed on a corresponding threaded portion (33), a conductive terminal (35) being provided in a frontal position with respect to the inner portion (34) of said moving electric terminal, said conductive terminal being adapted to be displaced from a position of contact with to a position of separation from said inner portion depending on the position of a shiftable element (39) actuated by the door-actuated switch button.
- Lamp-holding fixture according to claim 9, characterized in that said shiftable element (39) is arranged to act upon an elastic relief (38), which impresses a corresponding pushing action on to the opposite end portion (37) of said conductive terminal (35).
- Lamp-holding fixture according to claim 10, characterized in that said conductive terminal (35) is adapted to rotate about a pin (36) arranged inside said inner volume.
- Lamp-holding fixture according to any of the preceding claims from 9 to 11, characterized in that a second electric contact is provided by a side terminal (31B) protruding from the threaded wall of the lamp-holding fixture and coming into contact with the conductive threaded portion (33) of the lamp, said second electric contact (31B) entering said inner volume (25) through an elastic air-tightly sealing gasket (50), the other end portion of said electric contact (31B) being capable of establishing a releasable contact with a conductor (45B) connected to the other polarity of the power supply, said elastic air-tightly sealing gasket and said electric contacts (31B, 45B) being arranged so that, when the lamp is screwed in, its threaded portion (33) pushes said electric contact (31B) inwardly, thereby causing the opposite end portion thereof to come into contact with the conductor (45B), whereas, when the lamp is removed, said contact (31B) moves backwards, thereby separating its opposite end from said conductor (45B).
- Lamp-holding fixture according to any of the preceding claims from 9 to 12, characterized in that the outer portion (40) of the recess provided to accomodate the lamp is made of an elastic material and is in the shape of an inwardly oriented frustum of a cone, the inside diameter of said outer portion being such as to elastically interfere with the bulb of the lamp when the latter is mounted in place.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPN940030 | 1994-05-20 | ||
IT94PN000030A IT1267720B1 (en) | 1994-05-20 | 1994-05-20 | REFRIGERATOR WITH IMPROVED LAMP HOLDER |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0683367A1 EP0683367A1 (en) | 1995-11-22 |
EP0683367B1 true EP0683367B1 (en) | 2000-01-19 |
Family
ID=11394907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95105811A Expired - Lifetime EP0683367B1 (en) | 1994-05-20 | 1995-04-19 | Lamp holding fixture for a refrigeration apparatus |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0683367B1 (en) |
CN (1) | CN1073688C (en) |
DE (1) | DE69514566T2 (en) |
DK (1) | DK0683367T3 (en) |
ES (1) | ES2144064T3 (en) |
IT (1) | IT1267720B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101469809B (en) * | 2007-12-29 | 2011-03-23 | 海洋王照明科技股份有限公司 | Miniature explosion-proof headlamp |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1280177B1 (en) * | 1995-05-26 | 1998-01-05 | Gabriele Centazzo | ANTI-ACCIDENT LAMPHOLDER |
TWI321211B (en) * | 2003-06-30 | 2010-03-01 | Sanyo Electric Co | Interior lamp socket and refrigerator using the same |
EP2023446B1 (en) | 2007-08-08 | 2011-12-28 | Gjm, S.A. | Non-bayonet fitting lamp socket for vehicle headlamps |
DE102011083080B4 (en) * | 2011-09-20 | 2016-05-04 | Siemens Schweiz Ag | Socket for holding a danger detector, danger detector for insertion into such a base and hazard alarm system with such a base and hazard detector |
KR102267891B1 (en) | 2014-12-01 | 2021-06-23 | 삼성전자주식회사 | Refrigerator |
CN104613428A (en) * | 2015-01-29 | 2015-05-13 | 宁波泰格莱特灯具有限公司 | Led lamp mounting structure |
CN107702030A (en) * | 2017-09-28 | 2018-02-16 | 谢志坚 | A kind of constructing tunnel lighting device |
CN110953503B (en) * | 2019-11-11 | 2021-07-16 | 朱辰 | Square lamp |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2104164A (en) * | 1934-12-28 | 1938-01-04 | Ranco Inc | Refrigerator door lamp switch |
FR2498830A1 (en) * | 1981-01-26 | 1982-07-30 | Delaite Alain | Mains safety socket design to prevent electrocution - has sliding wedges which cover socket holes when plug is not engaged |
DE3515860A1 (en) * | 1985-05-03 | 1986-11-06 | Walter-Helmut 3005 Hemmingen Heitz | Lamp socket |
DE3742509A1 (en) * | 1987-12-15 | 1989-06-29 | Bosch Siemens Hausgeraete | ELECTRICAL LIGHTING DEVICE FOR HOME APPLIANCES LIKE OVENS |
IT1250381B (en) * | 1991-03-13 | 1995-04-07 | Zanussi Elettrodomestici | REFRIGERATOR WITH PERFECTED LAMPHOLDER |
GB9201657D0 (en) * | 1992-01-25 | 1992-03-11 | Mk Electric Ltd | Safety lampholder |
IT226765Z2 (en) * | 1992-07-13 | 1997-07-01 | Whirlpool Italia | LAMP HOLDER GROUP IN PARTICULAR FOR REFRIGERATORS AND SIMILAR |
-
1994
- 1994-05-20 IT IT94PN000030A patent/IT1267720B1/en active IP Right Grant
-
1995
- 1995-04-19 DK DK95105811T patent/DK0683367T3/en active
- 1995-04-19 EP EP95105811A patent/EP0683367B1/en not_active Expired - Lifetime
- 1995-04-19 DE DE69514566T patent/DE69514566T2/en not_active Expired - Fee Related
- 1995-04-19 ES ES95105811T patent/ES2144064T3/en not_active Expired - Lifetime
- 1995-05-18 CN CN95105398A patent/CN1073688C/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101469809B (en) * | 2007-12-29 | 2011-03-23 | 海洋王照明科技股份有限公司 | Miniature explosion-proof headlamp |
Also Published As
Publication number | Publication date |
---|---|
DE69514566T2 (en) | 2000-09-14 |
ITPN940030A1 (en) | 1995-11-20 |
CN1126818A (en) | 1996-07-17 |
CN1073688C (en) | 2001-10-24 |
IT1267720B1 (en) | 1997-02-07 |
ES2144064T3 (en) | 2000-06-01 |
DE69514566D1 (en) | 2000-02-24 |
ITPN940030A0 (en) | 1994-05-20 |
EP0683367A1 (en) | 1995-11-22 |
DK0683367T3 (en) | 2000-04-17 |
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