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EP 1 747 414 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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20.11.2013 Bulletin 2013/47 |
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Date of filing: 13.05.2005 |
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International Patent Classification (IPC):
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International application number: |
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PCT/EP2005/052216 |
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International publication number: |
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WO 2005/114071 (01.12.2005 Gazette 2005/48) |
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VACUUM STORAGE COMPARTMENT CONSTRUCTION IN COOLING APPARATUS
VAKUUMSPEICHERKAMMERKONSTRUKTION IN EINER KÜHLVORRICHTUNG
CONSTRUCTION D'UN COMPARTIMENT DE STOCKAGE PAR VIDE DANS UN APPAREIL DE REFROIDISSEMENT
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Designated Contracting States: |
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AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI
SK TR |
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Priority: |
13.05.2004 GB 0410718
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Date of publication of application: |
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31.01.2007 Bulletin 2007/05 |
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Proprietor: BSH Bosch und Siemens Hausgeräte GmbH |
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81739 München (DE) |
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Inventors: |
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- NAYLOR, Simon James
Cambridge Cambridgeshire CB1 7SF (GB)
- SHIRGAONKAR, Sameer
SW12 9NW (GB)
- NEAVE, James Beeching
SE10 8JT London (GB)
- MIDDLETON, Max William
E11 2RG London (GB)
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References cited: :
WO-A-01/81842 US-A- 5 271 240
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DE-A1- 10 248 510 US-A- 6 090 422
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The present invention relates to cooling apparatus and has particular reference to
vacuum storage compartment construction in cooling apparatus.
[0002] It has been proposed, e.g. in
WO 01/81842 A1 and in
US 5 271 240 A, to include in cooling apparatus, particularly domestic refrigerators, freezers and
refrigerator/freezer combinations, vacuum storage compartments for storage of foodstuffs
in a vacuum environment. Such an environment offers the possibility of retarding deterioration
of the stored products by, amongst other factors, reducing aerobic bacterial growth
and photosynthesis. Compartments of that kind should preferably be evacuated automatically
when products are placed in storage and returned to atmospheric pressure to allow
removal of products via a closable access opening of the compartment. Accordingly,
the compartments should be simple to evacuate and repressurise, capable of withstanding
subatmospheric pressure levels in the order of 200 millibars absolute for lengthy
periods of time and with repeated cycling, and relatively easy to keep hygienic and
to clean. The requirement of sustained maintenance of an internal underpressure should
be met in part by a minimum number of potential points of leakage. In wider terms,
such compartments should be simple and economic to produce, light in weight and, if
possible, capable of universal use in cooling apparatus of different designs, specifically
a compartment construction usable without modification or significant modification
in different apparatus configurations.
[0003] US 5271240 A discloses a cooling apparatus with an evacuatable storage compartment according to
the preamble of claim 1.
[0004] In
US 5 271 240 A, the vacuum storage compartment is rectangular in cross section, with flat side walls,
top and bottom walls. These flat walls must be thick in order to withstand atmospheric
pressure at the outside, making the apparatus expensive.
[0005] WO 01/81842 A1 proposes a cooling apparatus in which an evacuatable storage compartment is defined
by a cylindrical container having a back wall and a tubular wall extending between
said back wall and an access opening. The tubular wall is highly resistant against
outside pressure, but the circular cross section of the compartment is inconvenient
for storing goods inside.
[0006] The principal object of the Invention is therefore to provide cooling apparatus having
a storage compartment which may be capable of universal use and which is of robust
yet simple construction to withstand differential pressure without undue susceptibility
to leakage.
[0007] Subsidiary objects of the invention include low-cost construction with a relatively
small number of parts so as to facilitate mass production and assembly. Further objects
and advantages are evident from the following description.
[0008] According to the present invention there is provided cooling apparatus provided with
an evacuatable storage compartment defined by a separately constructed box unit comprising
an integral structure, which forms two side walls, a top wall, a bottom wall and a
back wall of the unit and bounds a front access opening, and an openable door sealably
closing the access opening, wherein at least one of the walls includes at least one
integral stiffening rib.
[0009] The stiffening rib promotes resistance of the wall to deformation under differential
pressure loading.
[0010] A storage compartment in the form of a separately constructed box unit represents
a self-contained module with a capability of use in different types or variations
of cooling apparatus, including refrigerators, freezers and refrigerator/freezer combinations.
This is of particular advantage in the case of product ranges containing models which
may have different sizes and fits of internal equipment, but the same fundamental
features, such as refrigerating, freezing and vacuum storage compartments. The unit
may then be able to be used with little or no modification in all products within
the range, which represents a significant advantage with respect to manufacturing
cost. This advantage is combined with the intrinsically strong and robust compartment
construction achieved by an integral structure forming all of the walls of the box
unit. This one-piece design eliminates all potential points of leakage otherwise present
at wall junctions and provides a substantial reduction in the number of parts necessary
for making up the unit, which is of benefit for low-cost manufacture and assembly.
The integral structure can, at the time of production, be readily provided with integrated
features associated with mounting of the door and supply of air to and extraction
of air from the compartment.
[0011] The capability of the box unit to resist the load induced by evacuation of the interior
and by maintenance of an appropriate level of underpressure may be enhanced by each
of the side, top and bottom walls, formed by the integral structure being curved so
as to be convex at the outside of the unit. The structure then has a construction,
at least in part, simulating a pressure vessel with walls bowed outwardly to prevent
collapse or buckling due to underpressure at the concave faces. The strength of the
structure may be further increased if one or more of the junctions of the walls is
radiussed so as to eliminate abrupt transitions; this feature also assists maintenance
of hygiene by reducing food traps and eases the task of cleaning.
[0012] The door can be mounted on the integral structure in any desired manner, but, in
one particularly advantageous embodiment, mounting is on a drawer movable in the unit,
for example slidable on guides formed on inner surfaces of the side walls. Opening
of the door thus permits convenient removal of products deposited in the drawer. The
guides, for example in the form of runners, can be integral parts of the side walls.
[0013] The unit preferably comprises sealing means for sealing the door relative to a surround
which is formed by the integral structure and encircles the access opening. The sealing
means can, for example, be incorporated in a recess which is provided in the surround
and in which the door engages when closing the access opening.
[0014] The door itself can be transparent at least in part, for example made partly or entirely
of glass, to permit inspection of the contents of the compartment. The integral structure,
however, is preferably a plastics material moulding, which can be readily produced
by cooperating male and female moulds of simple form without undercuts or movable
parts.
[0015] An additional feature of the unit can be connections provided in the back wall of
the structure for the supply of air to and removal of air from the compartment. The
connections can consist of, for example, pipe or hose coupling elements mounted in
apertures in the back wall or formed integrally with that wall.
[0016] An embodiment of the present invention will now be more particularly described by
way of example with reference to the accompanying drawings, in which:
[0017] Fig. 1 is a schematic sectional side view of a refrigerator incorporating a vacuum
storage compartment, in an embodiment of the invention; and
[0018] Fig. 2 is an exploded schematic perspective view, to enlarged scale, of a box unit
defining the storage compartment.
[0019] Referring now to the drawings there is shown in Fig. 1, in highly schematic form,
a refrigerator 10 comprising a thermally insulating housing 11 enclosing a cooled
storage space 12 for storage of items at atmospheric pressure. The space 12 is closed
by a door 13. The housing 11 additionally contains a vacuum storage compartment 14
accessible at the housing exterior by way of a door 15. The compartment 14 is defined
by a separately constructed, i.e. entirely self-contained, box unit 16 which is mounted
in the housing 11 and is described in more detail further below, the unit being closed
by a respective door. Located below the compartment 14 is a space 17 accommodating
conventional components of an evaporating and condensing circuit of the refrigerator
as well as a vacuum pump and associated ducts and control elements for the vacuum
storage compartment 14.
[0020] Fig. 2 shows the box unit 16, which defines the storage compartment 14, separately
and to enlarged scale. In addition, the unit is shown in exploded illustration to
assist understanding of the unit construction. The basic component of the unit is
an integral structure 18 which consists of a one-piece moulded part of plastics material
and which forms two mutually opposite side walls 19, a top wall 20, a bottom wall
21, a back wall 22 and a front surround 23 encircling an aperture 24 which serves
as an access opening to the interior of the unit 16. Each of the side walls 19, top
wall 20 and bottom wall 21, as well as optionally the back wall 22, is curved so as
to be convex at its outer face and thereby impart to the unit increased resistance
to collapse or deformation under load, in particular an internal underpressure. In
addition, one or more of the walls incorporates an integral stiffening rib 25 or rib
pattern - shown by way of example at the top wall 20 - to further increase resistance
to distortion under load. The junctions of the various walls are radiussed so as to
optimise the strength of the structure 18 by removing bend locations. Radiussed junctions
at the inside of the unit also assist cleaning and eliminate traps for food residues.
[0021] The box unit 16 is completed by the afore-mentioned respective door, which is referenced
26 and which closes the aperture 24. When closed, the door 26 nests in a recess 27
in the surround 23 and sealingly co-operates with a resilient seal 28 mounted in the
recess, so that the interior of the storage compartment is then hermetically sealed
from the atmospheric pressure otherwise prevailing within the refrigerator housing
11. The door 26 can comprise a panel of transparent material, for example glass, to
afford the user a view of items stored in the compartment 14. The door 26 is carried
by a drawer 29 which is guided on runners 30 integrally formed at the inner surfaces
of the two side walls 19 of the unit 16. On opening of the door 26, for example by
means of a handgrip (not shown), the drawer 29 slides out to provide easy access to
products stored in the compartment.
[0022] The back wall 22 of the integral structure 18 includes two connections 31 for vacuum
pipes, hoses or other conduits for extraction of air from the compartment in an evacuation
phase, as well as maintenance of an evacuated state in a storage phase, and feed of
air to the compartment to restore atmospheric pressure so that the door can be opened
for removal and insertion of products.
[0023] Use of the vacuum storage compartment 14 in operation of the refrigerator 10 is self-evident
from the foregoing description. Access to the compartment is gained by opening the
external door 15 after which, and following pressurisation of the compartment, the
internal door 26 can be opened. After closure of the door 26, the compartment can
be evacuated again. Pressurisation and evacuation can be carried out automatically
by detectors responsive to operation of the door 26 and/or door 15 and to the pressure
level. The detectors can be, for example, mechanical switches and pressure switches.
Manually actuated switches can also be provided for control exclusively by a user
and/or for overriding automatic operation.
[0024] The refrigerator of the embodiment hereinbefore described incorporates a vacuum storage
compartment of a construction that readily withstands the level of underpressure encountered
in use and, subject to maintenance of effective door sealing, offers effective and
long-term vacuum tightness. The basic part of the box unit 16, i.e. the integral structure
18, is inexpensive and simple to make, thus compatible with large-scale production,
and can be easily provided with integrated features, such as the drawer runners and
duct couplings, in the moulding phase. The compartment constitutes a self-contained
module of a kind potentially capable of universal use for different models of refrigerator
without requiring modification. In the event of modification, however, this may be
able to be achieved by redesign and replacement of a single mould tool.
1. Cooling apparatus provided with an evacuatable storage compartment defined by a separately
constructed box unit comprising an integral structure, which forms two side walls,
a top wall, a bottom wall and a back wall of the unit and bounds a front access opening,
and an openable door sealably closing the access opening, characterised in that at least one of the walls includes at least one integral stiffening rib.
2. Apparatus as claimed in claim 1, wherein at least one of the walls is curved so as
to be convex at the outside of the unit.
3. Apparatus as claimed in claim 2, wherein the side, top and bottom walls are each curved
so as to be convex at the outside of the unit.
4. Apparatus as claimed in any one of the preceding claims, wherein at least one of the
junctions of the walls is radiussed.
5. Apparatus as claimed in any one of the preceding claims, wherein the door is mounted
on a drawer movable in the unit.
6. Apparatus as claimed in claim 5, wherein the drawer is slidable on guides formed on
inner surfaces of the side walls.
7. Apparatus as claimed in any one of the preceding claims, wherein the unit comprises
sealing means for sealing the door relative to a surround which is formed by the integral
structure and encircles the access opening.
8. Apparatus as claimed in claim 7, wherein the door when closed engages in a recess
in the surround.
9. Apparatus as claimed in any one of the preceding claims, wherein the door is transparent
at least in part.
10. Apparatus as claimed in any one of the preceding claims, wherein the integral structure
comprises a plastics material moulding.
11. Apparatus as claimed in any one of the preceding claims, wherein the back wall of
the structure is provided with connections for the supply of air to and removal of
air from the compartment.
12. Apparatus as claimed in any one of the preceding claims, wherein the apparatus is
a refrigerator, a freezer or a refrigerator/freezer.
1. Kühlvorrichtung, welche mit einer evakuierbaren Speicherkammer versehen ist, die durch
eine separat ausgebildete Kasteneinheit definiert ist, die eine einstückige Struktur,
welche zwei Seitenwände, eine Deckenwand, eine Bodenwand und eine Rückwand der Einheit
bildet und eine vordere Zugangsöffnung begrenzt, und eine öffenbare Tür, welche die
Zugangsöffnung dicht verschließt, umfasst, dadurch gekennzeichnet, dass mindestens eine der Wände mindestens eine angeformte Versteifungsrippe aufweist.
2. Vorrichtung nach Anspruch 1, wobei mindestens eine der Wände gekrümmt ist, sodass
sie an der Außenseite der Einheit konvex ist.
3. Vorrichtung nach Anspruch 2, wobei die Seitenwände, die Decken- und die Bodenwand
jeweils gekrümmt sind, sodass sie an der Außenseite der Einheit konvex sind.
4. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei mindestens eine der Verbindungsstellen
der Wände abgerundet ist.
5. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei die Tür auf einem Einschub
angebracht ist, der in der Einheit beweglich ist.
6. Vorrichtung nach Anspruch 5, wobei der Einschub auf Führungen gleiten kann, die an
Innenflächen der Seitenwände ausgebildet sind.
7. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei die Einheit Dichtmittel
zum Abdichten der Tür bezüglich einer Einfassung umfasst, welche von der einstückigen
Struktur gebildet wird und die Zugangsöffnung umrandet.
8. Vorrichtung nach Anspruch 7, wobei die Tür, wenn sie geschlossen ist, in eine Vertiefung
in der Einfassung eingreift.
9. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei die Tür wenigstens teilweise
durchsichtig ist.
10. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei die einstückige Struktur
ein Kunststoffformteil umfasst.
11. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei die Rückwand der Struktur
mit Anschlüssen für die Zuführung von Luft und die Abführung von Luft in die bzw.
aus der Kammer versehen ist.
12. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei die Vorrichtung ein Kühlschrank,
ein Gefrierschrank oder ein Kühlgefriergerät ist.
1. Appareil de refroidissement prévu avec un compartiment de stockage évacuable défini
par une unité de boîte construite séparément comprenant une structure intégrée, qui
forme deux parois latérales, une paroi supérieure, une paroi inférieure et une paroi
arrière de l'unité et relie une ouverture d'accès frontale, et une porte ouvrable
fermant de manière étanche l'ouverture d'accès, caractérisé en ce qu'au moins une des parois inclut au moins une nervure raidisseuse intégrée.
2. Appareil selon la revendication 1, dans lequel au moins une des parois est incurvée
de façon à être convexe à l'extérieur de l'unité.
3. Appareil selon la revendication 2, dans lequel les parois latérales, supérieure et
inférieure sont chacune incurvées de façon à être convexes à l'extérieur de l'unité.
4. Appareil selon l'une quelconque des revendications précédentes, dans lequel au moins
une des jonctions des parois est arrondie.
5. Appareil selon l'une quelconque des revendications précédentes, dans lequel la porte
est montée sur un tiroir mobile dans l'unité.
6. Appareil selon la revendication 5, dans lequel le tiroir est coulissant sur des guides
formés sur des surfaces intérieures des parois latérales.
7. Appareil selon l'une quelconque des revendications précédentes, dans lequel l'unité
comprend un moyen d'étanchéité pour fermer la porte de façon étanche par rapport à
un environnement qui est formé par la structure intégrée et encercle l'ouverture d'accès.
8. Appareil selon la revendication 7, dans lequel la porte, lorsqu'elle est fermée, s'engage
dans un renfoncement dans l'environnement.
9. Appareil selon l'une quelconque des revendications précédentes, dans lequel la porte
est transparente au moins en partie.
10. Appareil selon l'une quelconque des revendications précédentes, dans lequel la structure
intégrée comprend un moulage de matériau plastique.
11. Appareil selon l'une quelconque des revendications précédentes, dans lequel la paroi
arrière de la structure est prévue avec des connexions pour l'arrivée d'air dans le
et la sortie d'air du compartiment.
12. Appareil selon l'une quelconque des revendications précédentes, dans lequel l'appareil
est un réfrigérateur, un congélateur ou un réfrigérateur/congélateur.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description