EP2832916B1 - Machine de traitement de linge comprenant un tambour rotatif - Google Patents

Machine de traitement de linge comprenant un tambour rotatif Download PDF

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Publication number
EP2832916B1
EP2832916B1 EP13178820.0A EP13178820A EP2832916B1 EP 2832916 B1 EP2832916 B1 EP 2832916B1 EP 13178820 A EP13178820 A EP 13178820A EP 2832916 B1 EP2832916 B1 EP 2832916B1
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EP
European Patent Office
Prior art keywords
holes
rotatable drum
lateral wall
laundry
washing
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EP13178820.0A
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German (de)
English (en)
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EP2832916A1 (fr
Inventor
Calum Armstrong
Alessandro Lazzarini
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Electrolux Appliances AB
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Electrolux Appliances AB
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Priority to EP13178820.0A priority Critical patent/EP2832916B1/fr
Publication of EP2832916A1 publication Critical patent/EP2832916A1/fr
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis

Definitions

  • the present invention relates to the technical field of laundry treating machines. It is underlined that in the present application the expression “laundry treating machine” may as well indicate a "simple" laundry washing machine (i.e., a machine which can only wash and rinse the laundry), a “simple” laundry drying machine (i.e., a machine which can only dry the laundry) and a laundry washing-drying machine (i.e., a machine which can wash, rinse, and dry the laundry), both of the front-loading type and of the top-loading type (both of the horizontal axis type and of the vertical axis type).
  • a "simple" laundry washing machine i.e., a machine which can only wash and rinse the laundry
  • a laundry washing-drying machine i.e., a machine which can wash, rinse, and dry the laundry
  • the present invention relates to a rotatable drum for such a laundry treating machine.
  • front-loading laundry type washing machines generally comprise:
  • the drum is typically provided with a large number of through holes which are generally evenly distributed on the lateral wall of the drum.
  • the volume ratio between the average volume of the laundry stored in the drum and the nominal internal volume of the drum has significantly increased (in other words, nowadays the drum of the laundry washing machine is proportionally filled with much more laundry than in the past), causing an appreciable increase of the average thickness of laundry resting on the inner surface of the lateral wall of the drum.
  • This increase of the laundry density for surface unit implies that the laundry is strongly pressed against the inner surface of the lateral wall of the drum, thus significantly reducing or even partially blocking the outflow of the washing water through the drum holes.
  • a rotatable drum with the features of the preamble is disclosed in US 2005/044899 A1 .
  • EP 2372010 in the name of the same Applicant discloses a rotatable drum for a laundry washing machine comprising a substantially cylindrical lateral wall provided with a plurality of through holes which are arranged in an orderly manner in a plurality of outwards-projecting bulges formed on the substantially cylindrical lateral wall.
  • EP 2372010 discloses an embodiment wherein each bulge has a flat bottom having a central through hole and six further through holes, which are located at the vertexes of a hexagon located roughly centered to the bulge.
  • the perimeter of the bulges is substantially circular in shape and the plurality of bulges are aligned one another along a number of adjacent longitudinal rows staggered one another.
  • the main object of the present invention is therefore to reach the above mentioned goal.
  • Another object of the present invention is to provide a rotatable drum for a laundry treating machine which is relatively cheap and easy to produce.
  • a further object of the present invention is to provide a rotatable drum for a laundry treating machine which has a different looking appearance so that the consumer can immediately distinguish it from the rotatable drums of known laundry treating machines.
  • the present invention relates to a rotatable drum for a laundry treating machine, the rotatable drum comprising a substantially cylindrical lateral wall having a rotation axis, the substantially cylindrical lateral wall being provided with at least one perforated portion having a plurality of through holes which are arranged in an orderly manner so as to form groups of through holes, said through holes in each group being separated one another by first interspaces, said groups being in turn separated one another by second interspaces lacking through holes, the rotatable drum being characterized in that said first interspaces and said second interspaces of said at least one perforated portion have substantially the same radial distance from said rotation axis.
  • first and second interspaces of the perforated portion have substantially the same radial distance from the rotation axis implies that the first and second interspaces substantially belong to a single substantially cylindrical wall lacking inwards/outwards radial projections.
  • This fact grants that water/air can easily move between the first and the second interspaces, without being obstructed or being captured by possible protrusions, bulges, depressions, etc.; advantageously, in the case the laundry treating machine is a washing or washing-drying machine, the water (or water/detergent mixture) entering the holes of the perforated portion freely flows on the first and second interspaces, without any sort of stagnation (which can occur for instance in the outwards-projecting bulges of the rotatable drum according to EP 2372010 ). In the case the laundry treating machine is a drying or washing-drying machine, the drying air advantageously flows through the holes with extremely low pressure drop.
  • the rotatable drum of the invention advantageously has great stiffness and allows obtaining high washing efficiency.
  • a rotatable drum is cheap, easy to produce and easy to be serviced and/or repaired.
  • the consumer immediately distinguishes it from the rotatable drums of known laundry treating machines because it has a totally different looking appearance.
  • the arrangement of the through holes in the groups "imposes" a particular path direction to the water (or water/detergent mixture), which helps the water exchange during the washing cycle phase and gives a better evacuation during the spinning cycle phase.
  • the water (or water/detergent mixture) Due to the second interspaces, at low angular speed of the drum, the water (or water/detergent mixture) is dragged by the drum rotation and it follows a slightly longer path, staying in contact with the laundry for a longer period and ensuring a deeper wetting action beyond the simply immersion into the water contained into the tub. In addition thereof, a film of water occurs on the second interspaces, prolonging the above mentioned effect.
  • the second interspaces contrast the centrifugal force by pressing against the laundry and providing an additional wringing effect.
  • the arrangement of the through holes in the groups provides a good air flow through the drum, in this way allowing good drying performances.
  • said groups of through holes are arranged in a plurality of parallel rows, said groups being staggered one another.
  • said arrangement allows obtaining a high through holes density for surface unit.
  • the arrangement of the through holes in each of said groups defines a substantially polygonal pattern. More preferably, said substantially polygonal pattern is a regular polygon or a portion thereof. Even more preferably, said regular polygon is defined by a number of through holes equal at least to the number of vertexes of the regular polygon, for each vertex a through hole being formed.
  • said regular polygon is a hexagon.
  • said hexagonal pattern is easy to realize and it allows obtaining a very high through holes density for surface unit.
  • a hexagonal pattern allows obtaining a homogeneous perforated portion using a single pattern, due to the fact that hexagons tessellate.
  • said hexagon is formed by nineteen staggered through holes, which are arranged so that said hexagon has a central through hole surrounded by six through holes, surrounded in turn by twelve through holes, each side of said hexagon having three through holes.
  • this particular hexagonal pattern allows obtaining - in the case the laundry treating machine is a washing or washing-drying machine - an optimal water exchange during the washing cycle phase and evacuation during the spinning cycle phase.
  • the percentage ratio between a first area taken up by said through holes and a second area taken up by said through holes, said first interspaces and said second interspaces - said ratio being multiplied by 100 - is comprised in the range between 9.9% and 10.1%, extremes being included, and preferably said percentage ratio is of about 10%.
  • these particular percentage ratios allow obtaining - in the case the laundry treating machine is a washing or washing-drying machine - optimal performances during both the washing and spinning cycle phases. Indeed, values of percentage ratios lower than the above-mentioned range gives higher washing performances, but poorer spinning performances, and vice versa.
  • said through holes are substantially circular and have substantially the same diameter.
  • said diameter is comprised in the range between 2 mm and 4,5 mm, extremes being included, and even more preferably said diameter is about 3 mm.
  • Applicant found that these particular diameters allow obtaining - in the case the laundry treating machine is a washing or washing-drying machine - optimal performances during both the washing and spinning cycle phases.
  • said substantially cylindrical lateral wall is provided with more than one perforated portion and the rotatable drum comprises a plurality of lifters interposed between said perforated portions of said substantially cylindrical lateral wall, said lifters being associated with and projecting inwardly from said substantially cylindrical lateral wall.
  • the rotatable drum according to the invention comprises three lifters arranged substantially equidistantly along said substantially cylindrical lateral wall.
  • said substantially cylindrical lateral wall defines an inner and an outer substantially cylindrical surface
  • each through hole includes an aperture realized on said inner substantially cylindrical surface and a sleeve projecting radially outwards from said outer substantially cylindrical surface, wherein said sleeve preferably projects radially outwards from said outer substantially cylindrical surface for a radial height comprised in the range between 0.4 mm and 0.8 mm, extremes being included, and more preferably said radial height is of about 0.6 mm.
  • these particular heights do not damage the laundry.
  • said sleeve of said through holes has substantially rounded fillets in respect of said outer substantially cylindrical surface, said substantially rounded fillets preferably having a curvature radius "r" comprised in the range between 1.0 mm and 1.4 mm, extremes being included.
  • the water can easily slide through the holes, in the case the laundry treating machine is a washing or washing-drying machine. Furthermore, by using such particular curvature radii, the laundry is protected from any damage, since there are not sharp edges at the free end of said sleeves of the through holes.
  • the present invention relates to a laundry treating machine including a casing accommodating a rotatable drum suitable for receiving laundry to be treated, and a door provided for allowing access to the rotatable drum, the rotatable drum being realized according to what has been just mentioned above.
  • such a rotatable drum of said laundry treating machine has - individually or in combination - all of the structural and functional features discussed above with reference to the rotatable drum of the present invention and therefore has all of the above-mentioned advantages.
  • FIG. 1 a laundry treating machine according to the invention is shown, which is globally indicated with reference numeral 2.
  • the laundry treating machine of the invention can be a laundry washing machine, a laundry washing-drying machine or a laundry drying machine.
  • the laundry treating machine 2 is hereinafter also referred to as washing machine 2.
  • a laundry washing machine of the front-loading type is shown. It is however clear that the invention is applicable, substantially without any crucial modification, to a laundry treating machine of the top-loading type (both of the horizontal axis type and of the vertical axis type).
  • a rotatable drum 1 is mounted into the laundry washing machine 2 for housing the laundry to be washed.
  • the washing machine 2 illustrated in figure 1 advantageously comprises: an outer box casing 3, preferably, though not necessarily, parallelepiped-shaped; a hollow washing tub (not indicated in the enclosed figures), substantially cylindrical, suspended in floating manner inside the casing for example via a suspension system preferably, though not necessarily, comprising a number of coil springs (not shown) connecting the upper portion of the washing tub to the top of the casing 3, and one or more vibration dampers (not shown) connecting the lower portion of the washing tub to the bottom of the casing 3.
  • the rotatable drum 1 is positioned in axially rotating manner inside the washing tub for rotating about its longitudinal axis L; and an electric motor assembly (not shown) for rotating, on command, the rotatable drum 1 about its rotation axis L inside washing tub is also included.
  • the washing machine 2 illustrated in the enclosed figure 1 is a front-loading type washing machine, and therefore the washing tub is suspended substantially horizontally inside the casing 3, with a front opening (not indicated in the enclosed figures) of the washing tub directly faced to a laundry loading and unloading opening 4 formed in a front face 3a of the casing 3.
  • the front-loading type laundry washing machine 2 advantageously comprises: an elastic-deformable bellows 8 (chematically illustrated in figure 1 ), preferably substantially cylindrical, which connects the front opening of washing tub to the laundry loading and unloading opening 4 formed in the front face 3a of the casing 3; and a porthole door 9 which is advantageously hinged to the front face 3a of the casing 3 so as to rotate to and from a closing position in which the porthole door 9 closes the laundry loading and unloading opening 4 located in the front face 3a, so as to watertight seal the washing tub.
  • an elastic-deformable bellows 8 preferably substantially cylindrical, which connects the front opening of washing tub to the laundry loading and unloading opening 4 formed in the front face 3a of the casing 3
  • a porthole door 9 which is advantageously hinged to the front face 3a of the casing 3 so as to rotate to and from a closing position in which the porthole door 9 closes the laundry loading and unloading opening 4 located in the front face 3a, so
  • the rotatable drum 1 is preferably, though not necessarily, housed into the washing tub so that its longitudinal axis (or rotation axis) is oriented substantially horizontally and approximately coincides with the longitudinal axis of washing tub (clearly the invention may be applied without any crucial modification also to a washing machine, not illustrated, in which the washing tub and the rotatable drum are inclined with respect to the horizontal plane).
  • the washing machine 2 is also advantageously provided with:
  • the washing water recirculating and draining circuit may be replaced by a washing water draining circuit which is structured for solely sucking the washing water from the bottom of the washing tub and feeding this water directly into the waste-water exhaust duct (not shown) located outside the casing 3.
  • the casing 3, the washing tub, the suspension system, the electric motor assembly, the bellows 8, the porthole door 9, the fresh water supply circuit, the washing water recirculating and draining circuit and the water heater are commonly know parts in the laundry washing machine technical field, and therefore are not described in detail.
  • the rotatable drum 1 comprises a substantially cylindrical and hollow body 13 preferably, thought not necessarily, made of metal material, for example stainless steel.
  • the rotatable drum 1 may optionally comprise also a number (for example three) of transversal protruding ribs or lifter 14, which are located on an inner surface 13d of a substantially cylindrical lateral wall 13a of the body 13, evenly spaced one another.
  • the substantially cylindrical lateral wall 13a is also called wrapper of the drum 1.
  • transversal protruding ribs 14 preferably, thought not necessarily, extend substantially parallel to the longitudinal axis L of the body 13, i.e., of the rotatable drum 1, and project from the inner surface of the substantially cylindrical lateral wall 13a towards the center of the drum 1 so as to lift the laundry during the rotation of the rotatable drum 1.
  • the rotatable drum 1 is provided with a plurality of through holes 15 which are arranged at least on the substantially cylindrical lateral wall 13a (however further through holes may be optionally provided also on one or more of the front and back bases 13b, 13c of the substantially cylindrical and hollow body 13) so as to assure adequate water circulation across the drum 1 during all phases of the washing cycle.
  • the through holes 15 are also called drain holes.
  • the substantially cylindrical lateral wall 13a is provided with one or more perforated portions 13a' each one comprising a plurality of through holes 15 which are arranged in an orderly manner so as to form groups 15a of through holes 15.
  • the perforated portions 13a' may be for example three.
  • Three lifters 14 are in this case preferably interposed between the three perforated portions 13a'.
  • the three lifters 14 are associated with three linking portions 14a of the substantially cylindrical lateral wall 13a, each linking portion 14a being circumferentially arranged between two of the perforated portions 13a', so that the three lifters 14 are arranged substantially equidistantly along the substantially cylindrical lateral wall 13a.
  • Each linking portion 14a comprises element(s) (for example slots 50)for associating the lifter 14, for example through shape coupling between fin(s) and/or hook(s) comprised in the lifters 14 and slots 50.
  • the substantially cylindrical lateral wall 13a further comprises two opposed side portions 13a'', advantageously lacking through holes, arranged at the two opposed free side of the substantially cylindrical lateral wall 13a, so that the perforated portions 13a' and the linking portions 14a are interposed between the two opposed side portions 13a''.
  • the perforated portion(s) 13a' may cover the whole width of the substantially cylindrical lateral wall 13a.
  • first interspaces 15b As visible in figure 8a , where a single group 15a of through holes 15 is depicted, the through holes 15 in each group 15a are separated one another by first interspaces 15b.
  • the groups 15a are in turn separated one another by second interspaces 15c lacking through holes (see figures 8 and 8b ).
  • the first and second interspaces 15b, 15c are substantially non-perforated wall sections that separates the holes 15 from each others and the groups 15a one from the others, respectively.
  • the first interspaces 15b and the second interspaces 15c of the perforated portions 13a' have substantially the same radial distance from the rotation axis L.
  • the first interspaces 15b and the second interspaces 15c substantially belong to a single substantially cylindrical wall lacking inwards/outwards radial projections.
  • the groups 15a of through holes 15 are preferably arranged in a plurality of parallel rows, the groups 15a being staggered one another.
  • FIG 8 at least three different types of parallel rows can be identified, whose directions have been indicated with three axis, numbered R1, R2 and R3.
  • the parallel rows having direction R1 are substantially perpendicular to the rotation axis L
  • the parallel rows having direction R2 are substantially parallel to the rotation axis L
  • the parallel rows having direction R3 are slanting to the rotation axis L.
  • the arrangement of the through holes 15 in each of the groups 15a defines a substantially polygonal pattern which is a hexagon or a portion thereof.
  • a regular hexagon has been used in the illustrated preferred embodiment, but a different polygon (preferably a regular polygon) can be used as well (like a pentagon, a triangle, etc.).
  • a tessellating polygon is used.
  • the (regular) polygon pattern allows obtaining a high "compression" of the groups 15a, i.e. a high group density for surface unit.
  • the angle between the rows having axis R3 and an axix perpendicular to the rotation axis L is about 34°.
  • the hexagon is preferably formed by nineteen staggered through holes 15, which are arranged so that said hexagon has a central through hole 15' surrounded by six through holes 15", surrounded in turn by twelve through holes 15"', each side of this hexagon having three through holes 15'" and the vertex angle being of about 120°.
  • the nineteen through holes 15 of the hexagon are arranged in five staggered rows (having - in sequence - three, four, five, four and three through holes 15, respectively) extended along a direction substantially perpendicular to the rotation axis L (circumferential direction of the rotatable drum 1) and in nine rows (having - in sequence - one, two, three, two, three, two, three, two and one through holes 15, respectively) extended along a direction substantially parallel to the rotation axis L (axial direction of the rotatable drum 1).
  • the hexagonal groups 15a are separated one from the other of a distance substantially equal to the space occupied by a row of holes.
  • the hexagonal groups 15a are separated one from the other by a first distance substantially equal to the space occupied by a row of holes only along a direction substantially parallel to the rotation axis L (i.e. R2). This first distance is substantially equal to the width w1 of the rectangle indicated with A in figure 8b .
  • the hexagonal groups 15a are separated one from the other by a second distance slightly lower than the space occupied by a row of holes. This second distance is substantially equal to the width w2 of the rectangle indicated with B in figure 8b .
  • said second distance (w2) is lower than the space occupied by a row of holes of a percentage comprised in the range between 55.7% and 58%, extremes being included, and more preferably said percentage is of about 56.8%.
  • the second interspaces 15c include both the rectangles A and B.
  • one side of one hexagon is separated from one respective side of another adjacent hexagon by a distance w1 in direction L (or R2), and w2 in directions different from L (or R2).
  • one hexagon is surrounded by a second interspace 15c shaped as a substantially hexagonal ring, which separates such hexagon from the adjacent hexagons and whose sides have a width respectively w1 or w2.
  • the centers of the through holes 15 i.e., the distance between two center through holes 15' of two adjacent hexagons
  • the centers of the through holes 15 are spaced apart one another by a third distance w3, preferably comprised in the range between 42.5 mm and 43.1 mm, extremes being included, and more preferably said third distance w3 is of about 42.8 mm.
  • the centers of the through holes 15 of two adjacent hexagons are spaced apart one another by a fouth distance w4 comprised in the range between 37.8 mm and 38.4 mm, extremes being included, and more preferably said fourth distance is of about 38.1 mm.
  • the total amount of hexagonal groups 15a in the perforated portion 13a' may change depending on the length and width of rotatable drum 1, which depends on the laundry treating machine 2.
  • the groups 15a can be shaped not as a full hexagon, but also as a portion of the same, for example the groups 15a can have twelve through holes 15 arranged in three staggered rows (having - in sequence - three, four and five through holes 15, respectively) extended along a direction substantially perpendicular to the rotation axis L.
  • the groups 15a form hexagons each of which can be defined by a number of through holes equal at least to six (i.e., the number of vertexes of the hexagon), for each vertex a through hole being formed.
  • the through holes 15 are substantially circular and have substantially the same diameter.
  • such a diameter is comprised in the range between 2 mm and 4,5 mm, extremes being included, and more preferably said diameter is about 3 mm.
  • the centers of the through holes 15 of each group 15a are spaced apart one another by a fifth distance w5 comprised in the range between 31.2 mm and 31.8 mm, extremes being included, and more preferably said fifth distance is of about 31.5 mm.
  • the substantially cylindrical lateral wall 13a defines an inner and an outer substantially cylindrical surface 13d and 13e.
  • Each through hole 15 includes an aperture (or inlet) 16d realized on the inner substantially cylindrical surface 13d and a sleeve (comprising an outlet) 16e projecting radially outwards from the outer substantially cylindrical surface 13e.
  • the sleeve 16e preferably projects radially outwards from the outer substantially cylindrical surface 13e for a radial height comprised in the range between 0.4 mm and 0.8 mm, extremes being included, and more preferably this radial height is of about 0.6 mm.
  • the sleeve 16e has substantially rounded fillets 16e' in respect of the outer substantially cylindrical surface 13e.
  • the substantially rounded fillets 16e' preferably have a curvature radius ("r" in figure 9 ) comprised in the range between 1.0 mm and 1.4 mm, extremes being included, and more preferably said curvature radius is of about 1.2 mm.
  • the through holes 15 with the above-mentioned respective sleeves are obtained by embossing.
  • the inner substantially cylindrical surface 13d has rounded profile in order to avoid any damage of the laundry due to rips and tears.
  • the percentage ratio between a first area taken up by the through holes 15 and a second area taken up by the through holes 15, the first interspaces 15b and the second interspaces 15c - said ratio being multiplied by 100 - is comprised in the range between 9.9% and 10.1%, extremes being included. More preferably, such a percentage ratio is of about 10%.
  • said percentage ratio is the ratio between a "surface of holes” (i.e., the first area taken up by the through holes 15) and a "total surface” of one single perforated portion 13a' of the substantially cylindrical lateral wall 13a of the rotatable drum 1 (i.e., the second area taken up by the through holes 15, the first interspaces 15b and the second interspaces 15c). Said “total surface” of one single perforated portion 13a' is clearly visible in figure 7 , wherein three perforated portions 13a' are shown.
  • the "total surface" of one single perforated portion 13a' is the surface of one of the three rectangles indicated in figure 7 by dotted lines, each rectangle defining one perforated portion 13a' and being the smallest rectangle circumscribed about the groups 15a of through holes 15 of one single perforated portion 13a'.
  • a production of the rotatable drum 1 comprises the step of punching a substantially flat metal sheet 20 (shown in figure 7 ) which is preferably, though not necessarily, made of stainless steel, so as to realize, on the latter, the above-described plurality of groups 15a of through holes 15.
  • the substantially flat metal sheet 20 has a substantially rectangular shape.
  • the production of the rotatable drum 1 comprises the step of cylindrically bending the metal sheet 20 so as to form a cylindrical coil (shown in figure 6 ), in which the sleeves 16e of the through holes 15 protrude outwards (i.e., towards the external of the rotatable drum 1).
  • the production of the rotatable drum 1 comprises the step of side-to-side connecting the two facing opposite lateral edges of the metal sheet 20 preferably, though not necessarily, by clinching or welding, so as to form a cylindrical sleeve, i. e., to form the substantially cylindrical lateral wall 13a of the rotatable drum 1.
  • the production of the rotatable drum 1 further comprises the step of fitting, on the two axial ends of the substantially cylindrical lateral wall 13a, respectively the front base 13b (preferably, a ring-shaped flange provided with an opening for loading/unloading the laundry, as shown in figure 3 ) and the back base 13c (preferably, a rigid disc-shaped plate, as shown in figure 3 ), both preferably, though not necessary, made of stainless steel.
  • the front base 13b preferably, a ring-shaped flange provided with an opening for loading/unloading the laundry, as shown in figure 3
  • the back base 13c preferably, a rigid disc-shaped plate, as shown in figure 3
  • the assembly of the rotatable drum 1 comprises the step of side-to-side connecting, preferably, though not necessarily, via clinching or welding, the external circular border of the flange 13b and of the plate 13c to the the substantially cylindrical lateral wall 13a, so as to realize the substantially cylindrical and hollow body 13, which is preferably bell-shaped (i.e., cylindrical, hollow, closed at one base - i.e., the base 13c - and partially opened at the other base - i.e., the base 13b).
  • through holes analogous to the ones described above with reference to the substantially cylindrical lateral wall 13a may be present also in the ring-shaped flange 13b and/or in the disc-shaped plate 13c.
  • the production of the rotatable drum 1 comprises the step of fitting, on the two axial ends of the substantially cylindrical lateral wall 13a, respectively two rigid disc-shaped plates, both preferably, though not necessary, made of stainless steel.
  • the production of the rotatable drum 1 comprises the step of side-to-side connecting, preferably, though not necessarily, via clinching or welding, the external circular border of the two plates to the substantially cylindrical lateral wall 13a, so as to realize a hollow cylindrical body.
  • the rotatable drum 1 is to be mounted into a top-loading washing machine, on the substantially cylindrical lateral wall 13a there is an opening, not illustrated in the enclosed figures, adapted for allowing the loading/unloading of the laundry.
  • This opening is advantageously closable by one or more lids associated (for example hinged, or slidably associated) to the rotatable drum 1.
  • through holes analogous to the ones described above with reference to the substantially cylindrical lateral wall 13a can be present also in one or both the disc-shaped plates and/or on the one or more lids.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)

Claims (12)

  1. Tambour rotatif (1) pour une machine de traitement de linge (2), le tambour rotatif (1) comprenant une paroi latérale cylindrique (13a) présentant un axe de rotation (L), la paroi latérale cylindrique (13a) étant pourvue d'au moins une partie perforée (13a') comportant une pluralité de trous traversants (15) qui sont agencés de façon ordonnée de manière à former des groupes (15a) de trous traversants (15), lesdits trous traversants (15) dans chaque groupe (15a) étant séparés les uns des autres par de premiers espaces intermédiaires (15b), lesdits groupes (15a) étant à leur tour séparés les uns des autres par de seconds espaces intermédiaires (15c) dépourvus de trous traversants, le tambour rotatif (1) étant caractérisé en ce que lesdits premiers espaces intermédiaires (15b) et lesdits seconds espaces intermédiaires (15c) de ladite au moins une partie perforée (13a') présentent la même distance radiale à partir dudit axe de rotation (L), et en ce que l'agencement des trous traversants (15) dans chacun desdits groupes (15a) définit un hexagone, et en ce que les seconds espaces intermédiaires (15c) comprennent des rectangles de largeurs respectives w1 et w2.
  2. Tambour rotatif (1) selon la revendication 1, dans lequel lesdits groupes (15a) de trous traversants (15) sont agencés en une pluralité de rangées parallèles, lesdits groupes (15a) étant décalés les uns par rapport aux autres.
  3. Tambour rotatif (1) selon la revendication 1 ou 2, dans lequel ledit hexagone est défini par un nombre de trous traversants (15) égal au moins au nombre de sommets de l'hexagone, un trou traversant (15) étant formé pour chaque sommet.
  4. Tambour rotatif (1) selon les revendications 1 à 3, dans lequel ledit hexagone est formé par dix-neuf trous traversants décalés (15), qui sont agencés de telle sorte que ledit hexagone présente un trou traversant central (15') entouré par six trous traversants (15"), entourés à leur tour par douze trous traversants (15"'), chaque côté dudit hexagone comportant trois trous traversants (15''').
  5. Tambour rotatif (1) selon l'une quelconque des revendications précédentes, dans lequel le rapport de pourcentage entre la surface des trous (15) et la surface totale d'une seule partie perforée (13a') est compris dans la gamme entre 9,9 % et 10,1 %, les extrêmes étant inclus, et de préférence ledit rapport de pourcentage est d'environ 10 %.
  6. Tambour rotatif (1) selon l'une quelconque des revendications précédentes, dans lequel lesdits trous traversants (15) sont circulaires et ont le même diamètre.
  7. Tambour rotatif (1) selon la revendication 6, dans lequel ledit diamètre est compris dans la gamme entre 2 mm et 4,5 mm, les extrêmes étant inclus, et de préférence ledit diamètre est d'environ 3 mm.
  8. Tambour rotatif (1) selon l'une quelconque des revendications précédentes, dans lequel ladite paroi latérale cylindrique (13a) est pourvue de plus d'une partie perforée (13a') et le tambour rotatif (1) comprend une pluralité d'éléments de soulèvement (14) interposés entre lesdites parties perforées (13a') de ladite paroi latérale cylindrique (13a), lesdits éléments de soulèvement (14) étant associés avec et faisant saillie vers l'intérieur à partir de ladite paroi latérale cylindrique (13a).
  9. Tambour rotatif (1) selon la revendication 8, comprenant trois éléments de soulèvement (14) agencés de façon équidistante le long de ladite paroi latérale cylindrique (13a).
  10. Tambour rotatif (1) selon l'une quelconque des revendications précédentes, dans lequel ladite paroi latérale cylindrique (13a) définit une surface cylindrique intérieure (13d) et extérieure (13e), et chaque trou traversant (15) comprend une ouverture (16d) réalisée sur ladite surface cylindrique intérieure (13d) et un manchon (16e) faisant saillie radialement vers l'extérieur à partir de ladite surface cylindrique extérieure (13e), dans lequel ledit manchon (16e) fait de préférence saillie radialement vers l'extérieur à partir de ladite surface cylindrique extérieure (13e) pour une hauteur radiale comprise dans la gamme entre 0,4 mm et 0,8 mm, les extrêmes étant inclus, et mieux encore ladite hauteur radiale est d'environ 0,6 mm.
  11. Tambour rotatif (1) selon la revendication 10, dans lequel ledit manchon (16e) desdits trous traversants (15) présente des congés arrondis (16e') en relation avec ladite surface cylindrique extérieure (13e), lesdits congés arrondis (16e') présentant de préférence un rayon de courbure (r) compris dans la gamme entre 1,0 mm et 1,4 mm, les extrêmes étant inclus, mieux encore ledit rayon de courbure (r) est d'environ 1,2 mm.
  12. Machine de traitement de linge (2) comprenant une carrosserie (3) contenant un tambour rotatif (1) approprié pour recevoir du linge à traiter, et une porte (9) prévue pour offrir un accès au tambour rotatif (1), le tambour rotatif (1) étant réalisé selon l'une quelconque des revendications précédentes.
EP13178820.0A 2013-07-31 2013-07-31 Machine de traitement de linge comprenant un tambour rotatif Active EP2832916B1 (fr)

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EP13178820.0A EP2832916B1 (fr) 2013-07-31 2013-07-31 Machine de traitement de linge comprenant un tambour rotatif

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Application Number Priority Date Filing Date Title
EP13178820.0A EP2832916B1 (fr) 2013-07-31 2013-07-31 Machine de traitement de linge comprenant un tambour rotatif

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EP2832916B1 true EP2832916B1 (fr) 2018-03-07

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3412823B1 (fr) * 2017-06-08 2022-03-30 LG Electronics Inc. Tambour de machine à laver
PL3715522T3 (pl) * 2019-03-26 2022-09-12 Electrolux Appliances Aktiebolag Bęben piorący do urządzenia do prania pranych artykułów i urządzenie do prania pranych artykułów wyposażone w taki bęben

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
DE10205306B4 (de) * 2002-02-08 2006-12-28 BSH Bosch und Siemens Hausgeräte GmbH Trommelwaschmaschine mit einer von vorn beschickbaren Wäschetrommel
DE102004003346A1 (de) * 2004-01-22 2005-08-11 BSH Bosch und Siemens Hausgeräte GmbH Von vorn beschickbare Waschmaschine mit einer drehbaren Wäschetrommel
EP2325367A1 (fr) * 2009-11-20 2011-05-25 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. Tambour pour machines à laver et sèche-linge
EP2372010B1 (fr) 2010-04-01 2016-09-21 Electrolux Home Products Corporation N.V. Tambour rotatif pour machines à laver et procédé d'assemblage du tambour rotatif

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