[0001] The present invention relates to a filter of the extractable type for dishwashing
machines, comprising a tapered body, with lateral walls, for the drainage of the washing
liquid and with a bottom.
[0002] Dishwashing machines are known that are provided with filters for avoiding that the
residues removed from the dishes be placed in circulation with the washing liquid
and deposited again on the dishes. Such filters are normally composed of two filtering
elements; one being made of a fine mesh for withholding the small particles of residues,
while a second filtering element of a larger mesh being extractable for cleaning purposes,
has the task of withholding the larger particles, i.e. pieces of meat, tooth picks
or the like, so as to inhibit that such particles go on to block the drainage pump.
[0003] This kind of second filter, made up of a large mesh for avoiding the hinderance and
blockage of the drainage of the washing liquid, is substantially of cylidrical shape
and made of plastic material for ease and construction economy.
[0004] It is open at its superior extremity whilst it may be closed at its inferior extremity
having outlets in its cylidrical body.
[0005] The inferior section can be made closed so as to avoid large residues such as tooth
picks or the like, passing through the outlets and being drawn by the drainage pump
with the risk of blockage, the consequence of which being drainage hinderence, overheating
of the pump's motor, which could also cause it to burn out.
[0006] This solution providing for the inferior section to be closed, brings into evidence
the inconvenience that the small particles of residues are deposited on this surface,
which having no outlets for allowing the direct drainage of such residues with the
washing water, results in the fact that such residues can be placed in circulation
during the rinsing phase and be deposited on the washed dishes.
[0007] There are known various examples of realisation for avoiding such inconveniences,
that call for the utilisation of many components for constructing the filter.
[0008] In this way however, the filter becomes more complex, expensive and more difficult
to clean, as when extracted it is possible that the various components become dismantled,
thus causing difficulties for the user that may have problems in its re-assembly.
[0009] The aim of the present invention is to indicate a filter for dishwashing machines
that does not present the inconveniences of the type known.
[0010] To allow for such aims the present invention has as its object a filter of the extractable
type for dishwashing machines, comprising a tapered body, with lateral walls, for
the drainage of the washing liquid and with a bottom, characterised by the fact that
the bottom is provided with a plurality of openings of such a shape to allow for the
drainage of the washing liquid and small particles of residue contained within, whilst
retaining the larger residues eventually present in the washing liquid.
[0011] Further aims and advantages of the present invention will become clear from the detailed
description that follows and from the annexed drawings, supplied as a non-limiting
example, wherein:
figure 1 represents a sectioned side view of a filter for dishwashing machines according
to the invention;
figure 2 represents the plan view of a filter for dishwashing machines according to
the invention;
figure 3 represents a partial sectioned side view of a filter for dishwashing machines
according to a variant of the invention;
figure 4 represents a sectioned side view of the bottom of a filter for dishwashing
machines according to a further variant of the invention.
[0012] In the figures that represent an extractable type filter for washing machines realised
according to the detailes of the present invention, reference number 1 indicates the
filter, realised in stamped plastic material, where outlets 2 are obtained in the
cylindrical section due to a plurality of uprights, which allow for the lateral drainage
of the washing water; reference number 3 represents protruding wings that allow for
the extraction of the filter for cleaning purposes and its placing in a working position;
reference number 4 indicates two known means for holding the filter in place during
washing; with the reference number 5 the filter bottom in the form of an upturned
cone is indicated, made up of a series of concentric flat rings positioned at various
levels an held in place with a plurality of uprights, as in the cylindrical section,
thus creating a number of outlets 7 that allow for the drainage of the washing water
at the lower section.
[0013] Said concentric rings are realised in such a way the outer circumference of one ring
is the same as the internal circumference of the successive ring.
[0014] In such a way the passage of large food residues is prevented and above all the passage
of toothpicks and small bones is prevented that could cause a blockage of the drainage
pump, whilst allowing the drainage of the water from the bottom of the filter the
cleaning of such is improved and the deposits of residues on the bottom is practically
reduced to zero.
[0015] The charateristics of the filter become clear form the present description and annexed
drawings.
[0016] The advantages of the filter object of the present invention also result in being
clear from the present description.
[0017] In particular they are represented by the fact that:
- residue deposits do not collect on the bottom of the filter that could be placed in
circulation during the rinsing phases and be newly deposited on the dishes that have
just been washed;
- even with rather large outlets in the bottom, the filter prevents residues from passing
that could damage the drainage pump;
- the filter is realised with one single component and its construction is extremely
simple and economic.
[0018] It is clear that numerous variants are possible to the filter for dishwashing machines,
object of the present invention, one of which could be that represented in figure
3 where the bottom of the filter can be realised in the form of a cone with its point
facing upwards.
[0019] Another variant of the filter for dishwashing machines could be that represented
in figure 4 in which the level of the concentric rings of the bottom are inclined
towards the bottom, so as to facilitate the passage of the particles of residues and
in preventing them from depositing, thoroughly, on the concentric rings.
[0020] It is clear that numerous variants are possible by the man of the art, to the filter
for dishwashing machines described as an example, without however departing from the
inherent novelty principles of the invention.
1. Extractable filter for dishwashing machines, comprising a tapered body, with lateral
walls, for the drainage of the washing liquid and with a bottom, characterised by
the fact that the bottom is provided with a plurality of openings of such a shape
to allow for the drainage of the washing liquid and small particles of residue contained
within, whilst retaining the larger residues eventually present in the washing liquid.
2. Filter for dishwashing machines, according to claim 1, characterised by the fact that
the bottom is realised by a plurality of flat concentric rings (6).
3. Filter for dishwashing machines, according to claim 2, characterised by the fact that
the flat concentric rings (6) are positioned at various levels.
4. Filter for dishwashing machines, according to claim 3, characterised by the fact that
the external circumference of a ring (6) is approximately the same as the internal
circumference of the successive ring.
5. Filter for dishwashing machines, according to claim 1, characterised by the fact that
the bottom (5) is shaped in the form of a cone.
6. Filter for dishwashing machines, according to claim 1, characterised by the fact that
the bottom (5) is shaped in the form of an upturned cone.
7. Filter for dishwashing machines, according to claim 2, characterised by the fact that
the plane of concentric rings (6) is inclined with respects the horizontal plane of
the filter.
8. Filter for dishwashing machines, according to claim 1, characterised by the fact that
it is realised in a single piece.