EP2280108B1 - Front-loading laundry washing machine - Google Patents

Front-loading laundry washing machine Download PDF

Info

Publication number: EP2280108B1
Authority: EP; European Patent Office
Prior art keywords: drum; lifter; lifter element; laundry; washing machine
Prior art date: 2009-07-27
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.): Not-in-force

Application number

EP10170437A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP2280108A1 (en

Inventor

Marco Angelini

Antonio Mazzarella

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Whirlpool EMEA SpA

Original Assignee

Indesit Co SpA

Priority date (The priority date 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 date listed.)

2009-07-27

Filing date

2010-07-22

Publication date

2012-07-11

2010-07-22 Application filed by Indesit Co SpA filed Critical Indesit Co SpA

2010-07-22 Priority to PL10170437T priority Critical patent/PL2280108T3/pl

2011-02-02 Publication of EP2280108A1 publication Critical patent/EP2280108A1/en

2012-07-11 Application granted granted Critical

2012-07-11 Publication of EP2280108B1 publication Critical patent/EP2280108B1/en

Status Not-in-force legal-status Critical Current

2030-07-22 Anticipated expiration legal-status Critical

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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
- 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 a front-loading laundry washing machine.
Machines of the type referred to comprise a laundry drum mounted in a washing tub, which is in turn housed in a cabinet.
the cabinet has a front opening for loading laundry, where a hatch is mounted, and this opening is substantially aligned to a front opening of the tub, which is in turn substantially aligned to a front opening of the drum.
the drum is mounted so that it can rotate about a substantially horizontal or slightly inclined axis, which is in a fixed position with respect to the tub.
the tub is suspended elastically within the cabinet so as to be able to perform given oscillations as a result of the loads acting on the drum during rotation thereof, said loads being due to the weight of the laundry being treated.
a substantially tubular gasket which defines a water-tight passage. Giving out into a first end of said passage is the opening of the cabinet, whilst giving out into the other end is the opening of the tub and that of the drum.
the presence of the aforesaid gasket prevents part of the washing liquid or of the laundry from possibly coming out of the tub and drum and penetrating into the gap between the tub and the cabinet.
the gasket must enable a certain relative movement between the cabinet and the tub, given that the latter is subject to oscillation during rotation of the drum: for this reason, the gasket, and hence the tubular passage defined thereby, must have a certain axial length and be elastic, preferably shaped at least in part in bellows fashion.
the tubular passage defined by the gasket there usually extends also an internal or rear portion of the hatch, which is shaped in a way in itself known to provide a sort of barrier to prevent exit of the laundry at least from the bottom part of the mouth of the drum, during rotation of the latter.
the gasket, and the mouth of the drum there must exist an annular space or gap in order to enable both oscillations of the tub and rotation of the drum.
a device referred to as «laundry rejector» basically constituted by a deflector member, usually made of resilient material.
the deflector member traverses a limited area of the aforesaid gap and is shaped so as to project towards the inside of the front opening of the drum, in the proximity of its rim. In this way, following upon rotation of the drum, any items of laundry that might get partially caught in the gap at a certain point reach the deflector member, which physically pushes the item of laundry towards the inside of the drum, releasing it from the gap.
a machine of this type is known, for example, from the document WO 02/12612 , where a laundry rejector has a body basically constituted by a pocket made integral with the gasket; said pocket-like body is relatively yielding, so that inside it there projects a stiffening element, defined by a metal ring for fixing the gasket.
Document FR-A1-2255411 discloses a laundry washing machine comprising a drum having a cylindrical skirt having one or more arrays of holes, a plurality of lifter elements and a plurality of handles integrally formed in said skirt by purching and having a height lower than the height of said lifter elements.
the laundry drum is usually constituted by a peripheral wall or skirt, defining a substantially cylindrical shape, closed at the two ends by a front wall and a rear wall.
the peripheral wall of the drum is prevalently perforated, i.e., the majority of its angular development presents arrays of holes in such a way that, in the course of rotation of the drum, a partial and temporary immersion of the items of laundry is obtained in the bath of washing or rinsing liquid present in the bottom area of the tub.
the front wall of the drum is provided with the corresponding opening for loading, whilst fixed to the rear wall is the shaft used for setting the drum in rotation via a motor and possible transmission means.
the latter is provided inside with lifter elements or lifters, which project from the skirt of the drum itself in the direction of its centre.
Said lifter elements which can be made via shaping of the skirt or else configured as components fixed to the latter, are hollow and have an approximately triangular section.
provided inside the drum are at least three lifters, having a height, understood as the distance between the skirt and the top of the lifter element, of approximately 40-50 mm.
washing machines are also equipped with a system for recirculation of the treatment liquid.
part of the liquid present in the tub is drawn in by a pump and sprayed towards the inside of the drum, for example via nozzle means mounted in the top part of the tub or else in a position corresponding to the bellows-shaped gasket.
a solution of this sort is described, for example, in the already cited document WO 02/12612 , where mounted within the pocket-like body of the laundry rejector is a tubular nozzle, connected to which is the outlet end of a duct for recirculation of the liquid.
the effect of circulation is instead obtained by exploiting the lifter elements provided within the drum.
the circumferential wall of the drum has inlet passages, via which part of the liquid constituting the bath of washing or rinsing liquid present on the bottom of the tub can penetrate within the lifter element, when the latter substantially comes to occupy the area of the bottom dead centre of the drum.
the lifter element is also equipped with outlet passages in its part facing the inside of the drum, usually in a position corresponding to the cusp of the lifter element.
the object of the present invention is to provide a front-loading laundry washing machine that presents improved and reliable operation, as well as being simple and inexpensive to produce.
the reference number 1 designates as a whole a front-loading laundry washing machine according to the invention.
the machine 1 comprises a load-bearing structure or cabinet 2, elastically supported in which in a known way is a tub 3.
a perforated drum 4 for the laundry which can be driven in rotation about an axis A, via an electric motor 5.
the tub 3 and the drum 4 have respective front openings, designated by 3A and 4A, respectively, and the drum 4 is accessible to the user through an opening 2A made in the front wall of the cabinet 2.
the openings 2A, 3A and 4A are substantially coaxial or in any case aligned, preferably according to the axis A.
a hatch 6 (represented only in Figure 2 ), which has a frame 6A, hinged in a known way to the cabinet 2, associated to which is a containment body 6B, preferably transparent, for example made of glass.
the containment body 6B is shaped so as to project towards the inside of the cabinet 2 as far as in the proximity of the loading mouth of the drum 4, namely, its slightly projecting front part that delimits the opening 4A.
the internal part of the body 6B could possibly extend as far as within the opening 4A, it remaining understood that between the rim that delimits said opening and the body 6B there must in any case be provided a certain gap, given that - during operation of the machine 1 - the assembly that includes the tub 3 and the drum 4 is able to oscillate within the cabinet 2, whilst the hatch 6 remains in a fixed position.
a gasket 7, which is as a whole tubular in shape.
the gasket 7, which is preferably made of resilient elastomer material and is at least in part bellows shaped, has a first end connected in a water-tight way to the front part of the cabinet 2 so as to circumscribe the opening 2A.
the opposite end of the gasket 7 is instead connected in a water-tight way to a front flange-like part of the tub 3 so as to circumscribe the corresponding opening 3A thereof, with the opening 4A of the drum that gives out into the generally tubular duct defined by the gasket 7.
the gasket 7 In order to enable oscillations of the tub-drum assembly and rotation of the drum, the gasket 7 must have a certain axial extension and between the body 6B, the mouth of the drum 4, and the gasket itself must have a certain free space or annular gap, designated by G in Figure 2 .
the machine 1 comprises all the components necessary for its normal operation, which are not represented and described herein in so far as they are not of immediate interest for the purposes of the present invention, among which level-sensor means, means for heating the water, filters, safety devices, suspensions, a dispenser of washing agents, supply means for connection to a domestic water supply, a user interface, and a control unit, comprising, for example, a microcontroller with associated memory means, encoded in which are the instructions regarding general functions of the machine and the corresponding operating programs.
the reference number 12 designates a discharge union, connected to an opening present in the bottom region of the tub 3, which branches into two ducts 12A and 12B.
the duct 12A is connected to the intake of a discharge pump 13, there being connected to the delivery of the pump itself a discharge pipe 14.
the duct 12B is, instead, connected to the intake of a recirculation pump 15, there being connected to the delivery of the pump itself a recirculation pipe 16.
the pump 15 and the duct 16 form part of a system for recirculation of the washing or rinsing liquid, aimed at improving wetting of the laundry present in the drum 4.
the machine 1 is further equipped with laundry-rejector means, aimed at preventing the risks deriving from any possible imprisoning of flaps of laundry in the gap G.
laundry-rejector means aimed at preventing the risks deriving from any possible imprisoning of flaps of laundry in the gap G.
designated by 17 is a laundry rejector, the body of which is made of a single piece with the gasket 7; in the example, the laundry rejector 17 is located substantially in the region of the top dead centre of the opening of the drum 4, but said positioning is not to be understood as limiting.
the system for recirculation of the washing or rinsing liquid comprises an ejector or nozzle, configured for directing a jet of liquid into the drum 4 through the corresponding opening.
the ejector of liquid is formed directly in the laundry rejector 17, which is for this reason provided with an internal channelling 18, the inlet end of which is connected to the recirculation pipe 16, whilst the outlet end faces the inside of the drum 4.
the drum 4 has a peripheral skirt 20 having one or more arrays of holes 21, a rear wall 22, and a front wall 23, formed in which is the front opening 4A of the drum.
the skirt 20 has a plurality of lifter elements, which extend in length in the direction of depth of the drum 4, i.e., substantially parallel to the axis A of Figure 2 .
said lifters are configured as elements projecting towards the inside of the drum 4, present in which is the laundry to be treated.
the lifter elements of the drum are of types different from one another, both as regards their height and in terms of distance of the lifter element from the front wall 23.
the drum 4 envisages at least one lifter element of a first type, designated as a whole by 30, having a height appreciably lower than the height of a lifter element of the second type, designated by 40.
the at least one lifter element 30 is formed integrally with the skirt 20 and comprises at least one drawn indentation or recess in the skirt itself.
the at least one lifter element 30 has a height, understood as the distance between its top and the skirt 20 that is appreciably less than the height of the lifter element 40. Furthermore, the front end region of the at least one lifter element 30 is at a greater distance from the front wall 4A of the drum than from the front end region of the lifter element 40.
the drum 4 is provided with two lifter elements 30 and one lifter element 40, as represented in the figures, located at approximately 120° from one another.
each lifter element 30 comprises at least two drawn indentations or recesses.
each lifter element 30 consists of two drawn indentations or recesses, of which one (designated by 31) is closer to the front wall 23 of the drum and the other (designated by 32) is closer to the rear wall 22 of the drum.
the two indentations 31, 32 are located in an intermediate part of the depth of the skirt 20 and are aligned to one another in the direction of depth of the drum 4, with the distance between the two indentations 31, 32 that is smaller than the distance of the indentation 31 from the front wall 23 and the distance of the second indentation 32 from the rear wall 22 of the drum 4.
the length of each indentation 31, 32 is greater than the distance between them.
each first lifter element 30, i.e., each of the indentations 31, 32 is formed in a respective non-perforated region of the skirt 20; in the space that separates the two indentations 31, 32, delimited by a non-perforated portion of the skirt 20, part of the washing or rinsing liquid can hence freely penetrate into the drum and be temporarily withheld therein the course of its rotation.
each indentation 31, 32 has a shape longitudinally extended in the direction of depth of the drum 4.
the profile of the indentations 31, 32 is radial, except for the top surface or wall, which is preferably substantially plane. This enables reduction of the risks of wear on the laundry being washed.
this plane top is joined to the cylindrical part of the skirt 20 by two portions of spherical surface, designated by 31A, at the longitudinal end portions of the indentation, and by two portions of cylindrical surface 31C, at the longitudinal sides of the indentation 31.
the indentation 32 is preferably of identical conformation.
the lifter element 40 is configured as a component distinct from the skirt 20, for example made of moulded plastic material, and fixed to the latter with modalities in themselves known in the field, for example in positions corresponding to sheared passages made in the skirt.
This embodiment is, however, to be considered as preferred, though not essential, in so far as also the lifter element 40 could be obtained by deformation, in particular drawing, of the cylindrical wall of the drum.
Another advantage is linked to the possible presence of a laundry rejector in the washing machine.
the effect described above i.e., a reduced tendency of the items of laundry to penetrate into the gap G, has as consequence a reduction also of the mechanical stresses exerted by the laundry on the laundry rejector 17; the body of said laundry rejector can thus be made integral with the gasket 7, but without any need for additional reinforcements, such as an internal metal, or in any case rigid, core, as in the solution described in the document WO 02/12612 .
a further advantage, deriving from the aforesaid reduced stress that is exerted on the laundry rejector 17, is that a channelling 18 forming the terminal nozzle of the recirculation circuit 15-16 can be easily made in its body, without the need to provide, within said body, additional components, such as a purposely designed tubular element or plastic nozzle, as is, instead, the case in the document WO 02/12612 .
a further advantage of the invention is that the presence of a single lifter element of a traditional type (such as the lifter 40), i.e., having a height between approximately 35 mm and 50 mm, instead of the three traditional lifters provided in the machines according to the known art, enables an increase in the useful space within the drum. Said advantage may be particularly appreciated in laundry washing machines provided with drums of relatively small size.

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

EP10170437A 2009-07-27 2010-07-22 Front-loading laundry washing machine Not-in-force EP2280108B1 (en)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
PL10170437T PL2280108T3 (pl)	2009-07-27	2010-07-22	Ładowana od przodu pralka

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
ITTO2009A000569A IT1394949B1 (it)	2009-07-27	2009-07-27	Macchina per il lavaggio di biancheria a caricamento frontale

Publications (2)

Publication Number	Publication Date
EP2280108A1 EP2280108A1 (en)	2011-02-02
EP2280108B1 true EP2280108B1 (en)	2012-07-11

Family

ID=41813531

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP10170437A Not-in-force EP2280108B1 (en)	2009-07-27	2010-07-22	Front-loading laundry washing machine

Country Status (3)

Country	Link
EP (1)	EP2280108B1 (pl)
IT (1)	IT1394949B1 (pl)
PL (1)	PL2280108T3 (pl)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US10508377B2 (en)	2016-10-21	2019-12-17	Whirlpool Corporation	Laundry treating appliance with an adjustable height lifter
KR20200026061A (ko) *	2018-08-30	2020-03-10	엘지전자 주식회사	세탁기 및 세탁기의 제어방법
EP3845696A4 (en) *	2018-08-30	2022-05-18	LG Electronics Inc.	WASHING MACHINE AND CONTROL METHOD OF THE WASHING MACHINE
AU2019332488B2 (en) *	2018-08-30	2023-05-04	Lg Electronics Inc.	Washing machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1827413U (de) *	1958-05-12	1961-03-02	Siemens Elektrogeraete Gmbh	Waeschemitnehmer fuer eine trommelwaschmaschine.
DE2363935C3 (de) *	1973-12-20	1983-03-17	Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart	Mantel für eine mantelbeschickbare Wäschetrommel einer Waschmaschine
IT1190538B (it) *	1986-04-28	1988-02-16	Merloni Elettrodomestici Spa	Perfezionamento nel cestello delle macchine lavabiancheria
TR200300616T1 (tr) *	2000-08-07	2004-01-21	Arçeli̇k A.Ş.	Bir entegre saptırıcılı ev cihazı.
ES2214104B1 (es) *	2002-07-03	2005-12-16	Bsh Electrodomesticos España, S.A.	Tambor de lavadora.

2009
- 2009-07-27 IT ITTO2009A000569A patent/IT1394949B1/it active
2010
- 2010-07-22 PL PL10170437T patent/PL2280108T3/pl unknown
- 2010-07-22 EP EP10170437A patent/EP2280108B1/en not_active Not-in-force

Also Published As

Publication number	Publication date
EP2280108A1 (en)	2011-02-02
ITTO20090569A1 (it)	2011-01-28
PL2280108T3 (pl)	2013-03-29
IT1394949B1 (it)	2012-07-27

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