EP1321557B1 - Improved drum for clothes washing machine - Google Patents
Improved drum for clothes washing machine Download PDFInfo
- Publication number
- EP1321557B1 EP1321557B1 EP20010830784 EP01830784A EP1321557B1 EP 1321557 B1 EP1321557 B1 EP 1321557B1 EP 20010830784 EP20010830784 EP 20010830784 EP 01830784 A EP01830784 A EP 01830784A EP 1321557 B1 EP1321557 B1 EP 1321557B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drum
- liquid
- further characterized
- tubular part
- apertures
- 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
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Classifications
-
- 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
- D06F37/06—Ribs, lifters, or rubbing means forming part of the receptacle
- D06F37/065—Ribs, lifters, or rubbing means forming part of the receptacle ribs or lifters having means for circulating the washing liquid
-
- 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
- D06F23/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry
- D06F23/06—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and rotating or oscillating about an inclined axis
Definitions
- the present invention relates to a clothes washing machine drum of the type described in the preamble of Claim 1.
- This configuration does not however wet the lower portion of the drum evenly because the front region immersed in the wash liquid is under a shallower depth of water than the rear region.
- an auxiliary jet is required to recirculate the liquid and directly wet the load in the centre of the drum in the front area, whilst also wetting those regions which would not normally be the rotation of the drum.
- the abovementioned systems are not however capable of efficiently performing the abovementioned recirculation function, especially in the case of clothes washing machines on an inclined axis.
- GB 2 268 939 A discloses a laundry drum in which the at least part of the cylindrical wall of the drum is at least partially formed by a plurality of cells- To this end the cylindrical wall of the drum is formed by two concentric walls connected by rings which are disposed in the space created between these walls.
- US 3,201,958 A discloses a laundry washing machine, in which scoops are attached to the outer wall of the inner cage and each scoop comprises a box-like portion extending in both directions on the outer face of the cage.
- Both solutions increase the radial distance between the laundry containing space and the washing tub, thereby increasing the ineffective washing liquid volume outside the laundry containing space.
- a further drum for a washing tub of a clothes washing machine according to the preamble of claim 1 is known from DE 4310006 A1 .
- the object of the invention is therefore to provide a drum that optimizes the recirculation by raising as much liquid as possible and releasing it in those regions where the load would otherwise not be sufficiently wetted.
- a washing tub 10 is shown inside a washing machine housing.
- the tub 10 houses a centrifugal drum 12 mounted rotatably on the rear portion of the tub 10, and is fitted with a closable door 15.
- a bottom portion 55 of the tub 10 is connected to an outlet pipe 56 which leads to a plumbing circuit of known type (not shown) used for supplying and removing liquid to and from the tub 10.
- the axis of rotation 70 of the drum 12, and hence the tube 10 that surrounds this drum 12 have a given inclination, of for example 15°, with respect to the horizontal plane on which the clothes washing machine is stood.
- a liquid that fills the bottom 55 of the tub has a surface level 80 such that the depth of liquid inside the drum 12 at the front of the drum (nearest the door 15) is substantially less than in the rear portion (towards the left in Fig. 1 ).
- the drum 12 according to the invention is basically cylindrical in shape and has an at least partly perforated side wall 121.
- the side wall 121 is essentially formed by one or more surfaces of revolution about the axis of rotation 70, for example two cylindrical or frustoconical coaxial surfaces in contact with each other around the circumferences of their larger bases. This is to be understood as one possible, but not the only, embodiment of the invention since the side wall 121 could equally be curved or concave, such as to give the drum 12 the approximate shape of a barrel.
- a tubular part 122 that extends along the circumference of the wall 121.
- the tubular part 122 may form a closed annulus.
- the tubular part 122 is roughly triangular in radial cross section, having one side 123a in contact with the side wall 121, and a rounded vertex 123b radially directed towards the interior of the drum 12.
- the tubular part 122 contains a plurality of holes 124 separated more or less regularly from each other along a circular ridge 125 corresponding to the vertex 123b of the triangular section.
- the tubular part 122 advantageously also comprises a plurality of receptacle parts 130 spaced apart more or less regularly from each other. These receptacle parts 130 are integral with the tubular part 122 and project to at least one side, but preferably to both sides, of the tubular part 122 in a direction preferably inclined with respect to the axis of rotation 70.
- the angle of inclination ⁇ of the receptacle parts 130 with respect to the circumferential direction of the tubular part 122 is itself preferably other than 90°.
- a receptacle part 130 is made up of two hollow shells 130a, 130b which are arranged and extend transversely in opposite directions from the tubular part 122. In shape they are somewhat like the tip of a spear ( Fig. 1 ), with a concavity on the radially outward side with respect to the axis 70.
- These shells 130a, 130b each have an edge portion 131a, 131b inclined in such a way that, when the receptacle part 130 is at the lowest possible position of the tub 10, the edge portion 131a of the axially forward shell 130a is approximately parallel to the surface level 80 of the liquid, and, when the receptacle part 130 is at the highest possible position of the tub 10, it is the edge portion 131b of the axially rearward shell 130b that is approximately parallel to the surface level 80.
- the shells 130a, 130b which act as liquid fill chambers, have an internal cavity in fluid communication with the interior of the tubular part 122 through communication apertures 122a formed for example in the latter's side walls, and with the exterior of the drum 12 through filling apertures 132 formed in the radially outer wall 134 of the shells 130a and 130b and in the wall 121 of the drum 12.
- the filling apertures 132 are spoon-shaped to assist the intake of liquid during rotation of the drum 12, and may be formed on the radially outer side 123a of the tubular part 122, as an alternative or as an addition to the apertures present in the shells 130a, 130b of the receptacle part 130.
- the inside of the shells 130a, 130b is also in fluid communication directly with the interior of the drum 12 through outlet holes 133 on the edge portions 131a, 131b.
- the total area of the filling apertures 132 is advantageously greater than that of the holes 124 and 133.
- Figure 3 illustrates the relationship between the volumes of liquid present in the tubular part 122 and in the receptacle parts 130 at the top of the drum 12, that is during the phase of release of the liquid.
- the limited possibility of escape of the liquid from the tubular part compared with the volume of liquid supplied to it enables a comparatively high level of liquid to be maintained inside the tubular part and transported up to the top before being released completely.
- the structure described above acts in such a way that, when the rotation of the drum 12 carries a receptacle part 130 below the surface level 80 of the liquid, the shells 130a, 130b are filled through the filling apertures 132. In the course of rotation, the liquid flows from these shells 130a, 130b into the tubular part 122. As one of the receptacle parts 130 nears the highest part of the tub assembly 10, the liquid tends to drain out of the holes 124 and 133 and rain down on the clothes.
- tubular part 122 and receptacle parts 130 also results in an improved stirring of the clothes by giving them not only a circular motion but also an axial thrust towards the rear region of the drum where there is a greater depth of liquid.
- the length and slope of the shells 130a, 130b and their number may vary to suit the depth of the drum 12 and the characteristics of speed, rotation and revolution imparted to the load.
- the tubular part 122 also creates a separation within the drum 12, creating two sectors separate from each other in the axial direction, the lower of which collects the heavier items, while the higher sector permits washing of the lighter items, thus bringing about a differentiated washing action.
- the side wall 121 of the drum 12 preferably contains holes in the rear axial end region 151 and central region 152, that is in the lower regions immersed in the wash liquid.
- the forward axial end region 151 which is higher relative to the surface level 80 of the liquid, may advantageously have no holes in order to contain the liquid pushed there by centrifugal force.
- tubular part and receptacle parts are particularly advantageous when using tilted drums, it could equally well be used in a horizontal-axis drum.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
Description
- The present invention relates to a clothes washing machine drum of the type described in the preamble of
Claim 1. - It is known that some conventional washing machines have a cylindrical drum whose axis of rotation is inclined with respect to the plane on which the machine is stood. By means of this inclination it is possible to produce a front-loading washing machine which is easier to load the clothes into. The inclination also means that there can be very good liquid levels in the drum without drawing more than a comparatively small amount of water from the water main, since the liquid collects mostly in the vicinity of the bottommost corner portion of the drum.
- This configuration does not however wet the lower portion of the drum evenly because the front region immersed in the wash liquid is under a shallower depth of water than the rear region. For more even wetting of the clothes throughout the drum an auxiliary jet is required to recirculate the liquid and directly wet the load in the centre of the drum in the front area, whilst also wetting those regions which would not normally be the rotation of the drum.
- There are known many different systems used in horizontal-axis washing machines that produce this kind of recirculating jet using driving blades arranged around the inside of the drum so as to lift up the load and a certain quantity of water. One system of this type is disclosed in Patent Application
DE 40 01 422 . - The abovementioned systems are not however capable of efficiently performing the abovementioned recirculation function, especially in the case of clothes washing machines on an inclined axis.
-
GB 2 268 939 A -
US 3,201,958 A discloses a laundry washing machine, in which scoops are attached to the outer wall of the inner cage and each scoop comprises a box-like portion extending in both directions on the outer face of the cage. - Both solutions increase the radial distance between the laundry containing space and the washing tub, thereby increasing the ineffective washing liquid volume outside the laundry containing space.
- A further drum for a washing tub of a clothes washing machine according to the preamble of
claim 1 is known fromDE 4310006 A1 . - The object of the invention is therefore to provide a drum that optimizes the recirculation by raising as much liquid as possible and releasing it in those regions where the load would otherwise not be sufficiently wetted.
- These and other objects are achieved with a clothes washing machine drum according to
Claim 1. - There will now be described an illustrative and non-limiting embodiment of the invention, reference being made to the accompanying drawings in which:
-
Figure 1 is a partially sectioned schematic side view of a washing machine tub comprising a drum according to the present invention; -
Figure 2 is an enlarged view in axial section of a detail of the drum shown inFig. 1 , when in a low position inside the tub during the rotation of the drum; and -
Figure 3 is an enlarged view in axial section of the detail shown inFig. 2 when in a raised position within the tub. - According to
Fig. 1 , awashing tub 10 is shown inside a washing machine housing. Thetub 10 houses acentrifugal drum 12 mounted rotatably on the rear portion of thetub 10, and is fitted with aclosable door 15. Abottom portion 55 of thetub 10 is connected to anoutlet pipe 56 which leads to a plumbing circuit of known type (not shown) used for supplying and removing liquid to and from thetub 10. - As can be seen, the axis of
rotation 70 of thedrum 12, and hence thetube 10 that surrounds thisdrum 12, have a given inclination, of for example 15°, with respect to the horizontal plane on which the clothes washing machine is stood. As a consequence, a liquid that fills thebottom 55 of the tub has asurface level 80 such that the depth of liquid inside thedrum 12 at the front of the drum (nearest the door 15) is substantially less than in the rear portion (towards the left inFig. 1 ). - The
drum 12 according to the invention is basically cylindrical in shape and has an at least partly perforatedside wall 121. Theside wall 121 is essentially formed by one or more surfaces of revolution about the axis ofrotation 70, for example two cylindrical or frustoconical coaxial surfaces in contact with each other around the circumferences of their larger bases. This is to be understood as one possible, but not the only, embodiment of the invention since theside wall 121 could equally be curved or concave, such as to give thedrum 12 the approximate shape of a barrel. - Around the contacting edges of the two frustoconical surfaces, that is approximately halfway up the height of the
side wall 121, and integral with it, is atubular part 122 that extends along the circumference of thewall 121. - Advantageously, the
tubular part 122 may form a closed annulus. - In accordance with the invention, the
tubular part 122 is roughly triangular in radial cross section, having oneside 123a in contact with theside wall 121, and arounded vertex 123b radially directed towards the interior of thedrum 12. Thetubular part 122 contains a plurality ofholes 124 separated more or less regularly from each other along acircular ridge 125 corresponding to thevertex 123b of the triangular section. - The
tubular part 122 advantageously also comprises a plurality ofreceptacle parts 130 spaced apart more or less regularly from each other. Thesereceptacle parts 130 are integral with thetubular part 122 and project to at least one side, but preferably to both sides, of thetubular part 122 in a direction preferably inclined with respect to the axis ofrotation 70. The angle of inclination α of thereceptacle parts 130 with respect to the circumferential direction of thetubular part 122 is itself preferably other than 90°. - In accordance with the embodiment presented in
Fig. 2 , areceptacle part 130 is made up of twohollow shells tubular part 122. In shape they are somewhat like the tip of a spear (Fig. 1 ), with a concavity on the radially outward side with respect to theaxis 70. Theseshells edge portion receptacle part 130 is at the lowest possible position of thetub 10, theedge portion 131a of the axiallyforward shell 130a is approximately parallel to thesurface level 80 of the liquid, and, when thereceptacle part 130 is at the highest possible position of thetub 10, it is theedge portion 131b of the axiallyrearward shell 130b that is approximately parallel to thesurface level 80. - The
shells tubular part 122 throughcommunication apertures 122a formed for example in the latter's side walls, and with the exterior of thedrum 12 through fillingapertures 132 formed in the radiallyouter wall 134 of theshells wall 121 of thedrum 12. - The
filling apertures 132 are spoon-shaped to assist the intake of liquid during rotation of thedrum 12, and may be formed on the radiallyouter side 123a of thetubular part 122, as an alternative or as an addition to the apertures present in theshells receptacle part 130. The inside of theshells drum 12 throughoutlet holes 133 on theedge portions filling apertures 132 is advantageously greater than that of theholes -
Figure 3 illustrates the relationship between the volumes of liquid present in thetubular part 122 and in thereceptacle parts 130 at the top of thedrum 12, that is during the phase of release of the liquid. The limited possibility of escape of the liquid from the tubular part compared with the volume of liquid supplied to it enables a comparatively high level of liquid to be maintained inside the tubular part and transported up to the top before being released completely. - The structure described above acts in such a way that, when the rotation of the
drum 12 carries areceptacle part 130 below thesurface level 80 of the liquid, theshells filling apertures 132. In the course of rotation, the liquid flows from theseshells tubular part 122. As one of thereceptacle parts 130 nears the highest part of thetub assembly 10, the liquid tends to drain out of theholes - As will be appreciated, this kind of arrangement of the
tubular part 122 andreceptacle parts 130 also results in an improved stirring of the clothes by giving them not only a circular motion but also an axial thrust towards the rear region of the drum where there is a greater depth of liquid. The length and slope of theshells drum 12 and the characteristics of speed, rotation and revolution imparted to the load. - The
tubular part 122 also creates a separation within thedrum 12, creating two sectors separate from each other in the axial direction, the lower of which collects the heavier items, while the higher sector permits washing of the lighter items, thus bringing about a differentiated washing action. - In the case of a
tilted drum 12, theside wall 121 of thedrum 12 preferably contains holes in the rearaxial end region 151 andcentral region 152, that is in the lower regions immersed in the wash liquid. The forwardaxial end region 151, which is higher relative to thesurface level 80 of the liquid, may advantageously have no holes in order to contain the liquid pushed there by centrifugal force. - As can be appreciated, although such an arrangement of the tubular part and receptacle parts is particularly advantageous when using tilted drums, it could equally well be used in a horizontal-axis drum.
- Although only a few embodiments of the invention have been illustrated and described, it will be clear that numerous variants and modifications are possible within the scope of the same inventive concept.
Claims (15)
- Drum (12) for a washing tub (10) of a clothes washing machine, comprising:- a partly perforated side wall (121) formed by a surface that is basically a surface of revolution,- a basically tubular part (122) attached to the said side wall (121), said tubular part (122) extending substantially along a circumference of the side wall (121) and having apertures (124) capable of collecting, during the rotation of the drum (12), the liquid from below a surface level (80) of the liquid, in order to release it over the clothes from the upper portion of the tub (10),characterized in that:- the tubular part (122) is roughly triangular in radial cross section, having one side (123a) in contact with said side wall (121) an a rounded vertex (123b) that projects radially into the drum, and in that- spoon shaped filling apertures (132) in fluid communication with the exterior of the drum (12) and with the interior of the tubular part (122) are provided to collect said liquid from a bottom portion (55) of the tub (10) outside the drum.
- Drum (12) according to Claim 1, further characterized in that the tubular part (122) forms a closed annulus that extends along a circumference at a substantially halfway up the height of the side wall (121).
- Drum (12) according to Claim 1 or 2, further characterized in that the said tubular part (122) comprises a plurality of receptacle parts (130) with concavities turned radially outwards from the drum (12) and capable of collecting, transporting and releasing an additional volume of liquid.
- Drum (12) according to Claim 3, further characterized in that the said receptacle parts (130) are elongate in an approximately transverse direction with respect to the line of the tubular part (122).
- Drum (12) according to Claim 4, further characterized in that the receptacle parts (130) are inclined with respect to the axis of rotation (70) of the drum (12) in such a way as to present inclined surfaces capable of applying an axial force to the clothes.
- Drum (12) according to either of Claims 4 and 5, further characterized in that the receptacle parts (130) include at least one edge portion (131a, 131b) which, when the said receptacle parts (130) are in the bottom portion (55) of the tub (10), is parallel to the surface level (80) of the said liquid.
- Drum (12) according to any of claims 3-6, further characterized in that the filling apertures (132) capable of collecting the liquid from the bottom portion (55) of the tub (10) are formed on the said receptacle parts (130), which further contain outlet apertures (133) capable of releasing the liquid into the drum (12).
- Drum (12) according to either of Claims 6 and 7, further characterized in that the said receptacle parts (130) include communication apertures (122a) communicating with the interior of the tubular part (122) and capable of transferring the said liquid from the receptacle parts (130) into the tubular part (122).
- Drum (12) according to Claim 7, further characterized in that the said filling apertures (132) are in radially more outward positions, and the said outlet apertures (133) are in radially more inward positions.
- Drum according to Claim 7, further characterized in that the total area of the said filling apertures (132) is less than the total area of the said outlet apertures (133) and of the apertures (124) of the tubular part (122).
- Drum (12) according to any one of the preceding claims, whose axis of rotation (70) is inclined with respect to the surface of the liquid (80) in such a way as to raise the front or loading portion of the drum (12).
- Drum (12) according to Claim 11, further characterized in that, when the receptacle part (130) is at the bottom, a first edge portion (131a) thereof is parallel to the surface level (80) of the liquid, and, when the receptacle part (130) is up, its edge portion (131b) on the opposite side to the said first edge portion (131a) is parallel to the surface level (80) of the liquid.
- Drum (12) according to Claim 11, further characterized in that the side wall (121) of the drum (12) has regions without apertures in the said front portion.
- Drum (12) according to any one of the preceding claims, further characterized in that the said side wall (121) is basically cylindrical.
- Drum (12) according to any one of Claims 1 to 13, further characterized in that the said side wall (121) consists of two basically frustoconical portions joined around the circumferences of their larger bases.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20010830784 EP1321557B1 (en) | 2001-12-20 | 2001-12-20 | Improved drum for clothes washing machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20010830784 EP1321557B1 (en) | 2001-12-20 | 2001-12-20 | Improved drum for clothes washing machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1321557A1 EP1321557A1 (en) | 2003-06-25 |
EP1321557B1 true EP1321557B1 (en) | 2013-08-14 |
Family
ID=8184824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010830784 Expired - Lifetime EP1321557B1 (en) | 2001-12-20 | 2001-12-20 | Improved drum for clothes washing machine |
Country Status (1)
Country | Link |
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EP (1) | EP1321557B1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1297787A (en) * | 1960-05-12 | 1962-07-06 | Hoover Ltd | Improvements to rotary container washing machines |
GB1000033A (en) * | 1961-09-21 | 1965-08-04 | Polymark Int Ltd | Improvements in laundry washing machines |
DE4310006A1 (en) * | 1992-03-30 | 1993-10-28 | Inst Angewandte Forschung Gmbh | Washing machine for washing soln. intensive penetration in laundry - comprises unperforated washing drum and hollow body attached to drum with washing soln. entry and discharge openings, for min. amt. of free soln. |
IT229047Y1 (en) * | 1992-07-21 | 1998-06-24 | Zanussi Elettrodomestici | WASHING MACHINE WITH PERFECTED BASKET |
-
2001
- 2001-12-20 EP EP20010830784 patent/EP1321557B1/en not_active Expired - Lifetime
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Publication number | Publication date |
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EP1321557A1 (en) | 2003-06-25 |
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