EP0242737A1 - Laundry washing machine - Google Patents

Laundry washing machine Download PDF

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Publication number
EP0242737A1
EP0242737A1 EP87105328A EP87105328A EP0242737A1 EP 0242737 A1 EP0242737 A1 EP 0242737A1 EP 87105328 A EP87105328 A EP 87105328A EP 87105328 A EP87105328 A EP 87105328A EP 0242737 A1 EP0242737 A1 EP 0242737A1
Authority
EP
European Patent Office
Prior art keywords
drum
peripheral wall
tub
washing machine
liquid
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.)
Withdrawn
Application number
EP87105328A
Other languages
German (de)
English (en)
French (fr)
Inventor
Francesco Nodassi
Olindo Regazzo
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.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi SpA
Zanussi Elettrodomestici 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.)
Filing date
Publication date
Application filed by Industrie Zanussi SpA, Zanussi Elettrodomestici SpA filed Critical Industrie Zanussi SpA
Publication of EP0242737A1 publication Critical patent/EP0242737A1/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a laundry washing machine of the washing liquid recirculation type adapted to efficiently launder laundry of different nature at charges of differ­ent magnitude in the drum of the machine, and with differ­ent washing liquid levels in the laundering tub.
  • a laundry washing machine of the type specified above comprising a laundering tub, a washing liquid collecting receptacle communicating with a lower portion of the tub, and an electric pump communicating with a top portion of the tub through a recirculation conduit for irrigating the laundry by repeated recircul­ation of the washing liquid from the collecting receptacle to the tub.
  • This machine is capable of carrying out "intensive” and “delicate” laundry washing programmes for laundering varyiable quantities of cotton fabrics and/or of mixed cotton and synthetics fabrics capable of withstanding high temperatures of the washing liquid, as well as delicate fabrics and/or woolens.
  • the "intensive" laundering programmes may selectively be carried out with normal or reduced levels of the washing liquid in the tub, resulting respectively in complete immersion of the laundry in the washing liquid, and in irrigation of the laundry with the liquid.
  • the drum of the machine is rotated at respective laundering speeds and at the spin­drying speed, the electric recirculation pump being kept in the energized state only in the presence of reduced washing liquid levels in the laundering tub.
  • a laundry washing machine of the type described permits the consumption of water, detergents and electric power to be considerably reduced,it suffers from the disadvantage of a rather complicated construction due to the employ of the recirculation pump and conduit, and to the necessity of providing at least one filtering element of conventional type in the collecting receptacle for retaining impurities and any foreign bodies possibly entrained by the washing liquid.
  • this machine comprises a rotatable drum of conventional type, formed with perforations in its lateral walls, the drum being housed in a laundering tub and so dimensioned that its circumferential wall extends closely adjacent the corresponding circumferential wall of the tub.
  • the tub is filled with a washing liquid to a predetermined reduced level, the liquid being heated by a heater element disposed in the bottom of the tub at a spaced location from the circumferential wall of the drum.
  • a laundry washing machine of this construction permits the laundry to be washed with a reduced consumption of water, detergents and electric energy, while still presenting certain shortcomings.
  • Another critical aspect in a laundry washing machine of this type is the extremely small distance between the respective walls of the drum and the tub. On the one hand this distance has to be sufficiently small for ensuring an efficient lifting action on the washing liquid contained in the drum during rotation of the drum, while on the other hand this distance may not be too small for avoiding any contact of the drum with the heater element disposed in the bottom portion of the tub.
  • a laundry washing machine comprising a launder­ing tub, a rotatable drum mounted in the tub, adapted to contain the laundry and composed of a perforate peripheral wall and two lateral closure walls, and a washing liquid collecting receptacle formed directly in the lower portion of the tub, the machine further comprising means for heat­ing the washing liquid preferably disposed within said collecting receptacle, and entrainment means adapted to cause the washing liquid to be repeatedly recirculated between the tub and the drum.
  • a machine of this type is characterized in that said entrainment means comprises a plurality of containers located at regular spacings about the peripheral wall of said drum and adapted on rotation of said drum in both directions to collect a volume of the washing liquid from the lower portion of said tub for lift­ing it to a predetermined maximum height for subsequently dropping it into said drum, from where said liquid returns to said tub through the perforations of said peripheral wall.
  • figs. 1 to 4 show diagrammatical illustrations of the laundering tub and the drum of a laundry washing machine according to four different embodiments of the invention.
  • the laundry washing machine according to the invention is shown in a diagram­matical front view
  • the machine is shown to comprise a laundering tub 5 supported in a known manner in a housing of the machine, a rotatable drum 6 mounted in tub 5 for containing the laundry to be washed and having a perforate peripheral wall 7 connected to two lateral closure walls (not shown), and a collector receptacle 8 for collecting the washing liquid supplied to tub 5, said receptacle 8 being integrally formed with tub 5 at the lower portion thereof and adapted to contain an electric heater element 9 of conventional construction.
  • the laundry washing machine further comprises at least one thermostatic sensor 10 of conventional type associated to collector receptacle 8 and electrically connected to heater element 9 for controlling the temperature of the washing liquid contained in receptacle 8 by successively energizing and deenergizing heater element 9.
  • the described laundry washing machine finally comprises a number of pressure switches or similar level control means (not shown) for controlling the supply of the washing liquid to tub 5 up to a normal or a reduced level, depending on the amount and type of laundry to be washed.
  • heater element 9, thermostat sensor 10, said pressure switches and the remaining electromechanical com­ponents of the machine are connected in the electric circuit thereof in the same manner as in the laundry washing machine described in the cited Italian Patent Application No. 45734 - A/83.
  • the machine according to the invention lacks the recircul­ation pump and conduit as well as a filter for the washing liquid, while still permitting the washing liquid to be recirculated between tub 5 and drum 6 in the manner to be described.
  • drum 6 is provided with a plurality of containers 111, 112 supported in corresponding recesses 12 formed at regular intervals along the outer surface of peripheral wall 7 of drum 6.
  • each recess 12 is formed by deforming peri­pheral wall 7 of drum 6 inwards so as to obtain a corres­ponding ridge 13 for entraining the laundry at the inner surface of peripheral wall 7.
  • Recesses 12 may of course also be formed in peripheral wall with different shapes and at different locations not corresp­onding to those of ridges 13 without thereby leaving the scope of the present invention.
  • FIG. 1b Shown in fig 1b is a perspective view on an enlarged scale of a detail of one of the recesses 12 described above.
  • the recess shown has an arcuate bottom 14 connected to peri­pheral wall 7 of drum 6 by two curved portions 15, 16.
  • Dis­posed in recess 12 at symmetric positions are two contain­ers 111, 112 each comprising two slightly curved imperfor­ate walls 17, 18 extending over the full width of the respective ridge 13 and converging towards a common termin­al portion 19, whereat the two walls are connected to one another and to peripheral wall 7 of drum 7 by a narrow sheet metal strip 20.
  • the two walls 17, 18 of each contain­er are closed off laterally by respective end walls 21 (only front end wall 21 being shown in fig. 1b), so that each container defines a chamber 22 the bottom of which is formed by terminal portion 19, while the side opposite the bottom is open.
  • the thus formed containers are dimensioned so that on rot­ation of drum 6 they do not come into contact with the peripheral wall of tub 5, and so as to permit them to collect determined volumes from the lower portion of tub 5 and to lift the thus collected washing liquid to a pre­determined maximum height, from which the liquid drops back into drum 6 through the perforations of the respective portion of peripheral wall 7 to thereby soak the laundry contained in drum 6.
  • the washing liquid is lifted by the containers to a maximum height corresponding to the diameter of drum 6 as each pair of containers is displaced to a position opposite to the liquid contained in the lower portion of tub 5.
  • containers 11, 112 of each pair are disposed at symmetric positions facing one another, it is ensured that the wash­ing liquid is lifted in the described manner on rotation of drum 6 in both directions, i.e. container 112 acts to lift the liquid on clockwise rotation of drum 6, while container 111 lifts the liquid during counterclockwise rotation.
  • the described laundry washing machine thus permits washing programmes to be efficiently carried out by repeated recirculation of the washing liquid between tub 5 and drum 6 in the described manner, without the employ of an electric recirculation pump and conduit and a filter as formerly employed in the machine described in patent application No. 45734 - A/83.
  • the laundry washing machine according to the invention is moreover capable of carrying out the same washing programmes as described in patent application No. 45734 - A/83, i.e. "intensive” washing programmes with normal or reduced levels of the washing liquid in the laundering tub, for in the latter case obtaining reduced consumption of water, detergents and electric energy, and "delicate” washing programmes with normal washing liquid levels in the tub.
  • the laundry washing machines shown in these figures are designed to operate in the same manner, and composed of the same structural components as the machine shown in fig. 1, the respective components being therefore designated by the same reference numerals.
  • a pair of containers 113, 114 is like­wise mounted in a respective recess 12 of drum 6
  • Contain­ers 113, 114 are of a construction similar to that shown in fig. 1, comprising a pair of slightly curved imperforate walls 17, 18 extending over the full width of the respect­ive ridge 13 of drum 6, and two lateral end walls 21 cooperating with walls 17, 18 to define a chamber 22 of the respective container.
  • each container In contrast to the construction shown in fig. 1, the slightly curved walls of each container converge in the opposite direction, so that the two containers 113, 114 disposed in each recess 12 are symmetric to one another and interconnected at a common terminal portion 23, the pair of containers being secured to peripheral wall 7 of drum 6 by respective narrow sheet metal strips 24.
  • This structural solution likewise permits the washing liquid to be lifted from the lower portion of tub 5 on rotation of drum 6 in both directions, container 113 acting to lift the liquid on clockwise rotation of drum 6, while contain­er 114 is effective to lift the liquid on counterclockwise rotation.
  • each container 115 is no longer housed in a corresponding recess in the peripheral wall of the drum, its construction being also different from that of the embodiments described above.
  • Each container 115 comprises an elongate channel member 25 extending over the full width of peripheral wall 7 of drum 6, and a pair of lateral end walls (not shown).
  • channel member 25 Connected to the open side of channel member 25 are two planar wall portions 26, 27 at offset positions relative to one another, wall portions 26, 27 being formed with suitable bores 28, permitting them to be secured as by means of screws or the like to the interior surface of peripheral wall 7 which in this embodiment is of a contin­uous circular shape.
  • each container 115 thus additionally acts as a ridge for entraining the laundry.
  • each container 115 is longitudinally divided by a transverse partition 29 into two identical chambers 30, 31 each provided with openings 32, 33 and 34, 35, respectively, for the admission to and discharge of the washing liquid from the respective chamber.
  • openings 32 and 33 are of identical shape and disposed at offset positions, being defined by the free edges of respective planar walls 26 , 27 and the free edge of channel member 25, all of said free edges being seated on the interior surface of peripheral wall 7.
  • the free edge of channel member 25 may also be recessed with respect to peripheral wall 7.
  • the discharge openings 34, 35 are formed at locations permitting the respective chamber on rotation of drum 6 to lift the washing liquid from the lower portion of the tub to a predetermined maximum height with respect to the liquid level in the tub, and to release the liquid at this height to drop onto the laundry in the drum.
  • chamber 30 of each container acts to thus lift the washing liquid on clockwise rotation of the drum, while chamber 31 is effective to lift the liquid on counter­clockwise rotation.
  • drum 6 is formed with the same recesses as in figs. 1 and 2, each recess 12 being divided into two identical chambers 116, 117 or containers by a central partition 36 extending within recess 12 over the full width of peripheral wall 7 of drum 6 and releasably secured to peripheral wall 7 by means of per se known fasteners.
  • Partition 36 is relatively thin-walled adjacent its con­nection to peripheral wall 7 and terminates in an enlarged portion at its free end.
  • containers 117 act to lift the washing liquid on clockwise rotation of drum 6, while containers 116 are effective to lift the liquid on counterclockwise rotation.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP87105328A 1986-04-17 1987-04-10 Laundry washing machine Withdrawn EP0242737A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45721/86A IT1192078B (it) 1986-04-17 1986-04-17 Macchina lavabiancheria
IT4572186 1986-04-17

Publications (1)

Publication Number Publication Date
EP0242737A1 true EP0242737A1 (en) 1987-10-28

Family

ID=11257690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105328A Withdrawn EP0242737A1 (en) 1986-04-17 1987-04-10 Laundry washing machine

Country Status (2)

Country Link
EP (1) EP0242737A1 (it)
IT (1) IT1192078B (it)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3712118A1 (de) * 1986-05-06 1987-11-12 Bosch Siemens Hausgeraete Trommelwaschmaschine
GB2205585A (en) * 1987-06-05 1988-12-14 San Giorgio Elettrodomesti Horizontal axis clothes washing machine
DE3726613A1 (de) * 1987-08-11 1989-02-23 Miele & Cie Waschmaschinentrommel
DE3803195A1 (de) * 1988-02-03 1989-08-17 Bosch Siemens Hausgeraete Mitnehmerrippe einer waschtrommel
EP0352439A2 (de) * 1988-07-26 1990-01-31 Bosch-Siemens HausgerÀ¤te GmbH Waschtrommel
WO2008003594A1 (de) * 2006-07-06 2008-01-10 BSH Bosch und Siemens Hausgeräte GmbH Waschmaschine mit hohlen mitnehmern
KR101125564B1 (ko) * 2005-04-27 2012-03-23 주식회사 대우일렉트로닉스 드럼세탁기의 잔수 순환장치
CN109881429A (zh) * 2019-04-12 2019-06-14 广州市信宏洗衣机械有限公司 一种洗水机
CN109881407A (zh) * 2019-04-12 2019-06-14 广州市信宏洗衣机械有限公司 一种微量雾化洗水机的洗水方法及采用该方法的洗水机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE163464C (it) *
FR377638A (fr) * 1907-02-16 1907-09-11 Elisabeth Beckmann Machine à laver à tambour avec dispositif de puisage et d'aspiration alternatifs, à chaque rotation, dans les deux sens
GB191022944A (en) * 1910-10-04 1911-09-28 William August Edwin Henrici Improvements in Washing Machines.
FR458768A (fr) * 1913-05-27 1913-10-18 Jacques Leon Caisso Tambour pour machines à laver le linge, à double enveloppe
GB640974A (en) * 1948-03-27 1950-08-02 Braithwaite I & Son Eng Ltd Improvements in machines for washing, dry cleaning or garment dyeing
GB819251A (en) * 1955-05-12 1959-09-02 Cherry Tree Machine Company Lt Improvements in or relating to rotary washing and like machines
FR1299679A (fr) * 1961-06-15 1962-07-27 Dispositif pour la circulation des bains dans les appareils de lavage, de blanchiment, de rinçage et autres appareils analogues
US3201958A (en) * 1961-09-21 1965-08-24 Polymark Holding Ltd Laundry washing machines

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE163464C (it) *
FR377638A (fr) * 1907-02-16 1907-09-11 Elisabeth Beckmann Machine à laver à tambour avec dispositif de puisage et d'aspiration alternatifs, à chaque rotation, dans les deux sens
GB191022944A (en) * 1910-10-04 1911-09-28 William August Edwin Henrici Improvements in Washing Machines.
FR458768A (fr) * 1913-05-27 1913-10-18 Jacques Leon Caisso Tambour pour machines à laver le linge, à double enveloppe
GB640974A (en) * 1948-03-27 1950-08-02 Braithwaite I & Son Eng Ltd Improvements in machines for washing, dry cleaning or garment dyeing
GB819251A (en) * 1955-05-12 1959-09-02 Cherry Tree Machine Company Lt Improvements in or relating to rotary washing and like machines
FR1299679A (fr) * 1961-06-15 1962-07-27 Dispositif pour la circulation des bains dans les appareils de lavage, de blanchiment, de rinçage et autres appareils analogues
US3201958A (en) * 1961-09-21 1965-08-24 Polymark Holding Ltd Laundry washing machines

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3712118A1 (de) * 1986-05-06 1987-11-12 Bosch Siemens Hausgeraete Trommelwaschmaschine
GB2205585A (en) * 1987-06-05 1988-12-14 San Giorgio Elettrodomesti Horizontal axis clothes washing machine
DE3726613A1 (de) * 1987-08-11 1989-02-23 Miele & Cie Waschmaschinentrommel
DE3803195A1 (de) * 1988-02-03 1989-08-17 Bosch Siemens Hausgeraete Mitnehmerrippe einer waschtrommel
EP0352439A2 (de) * 1988-07-26 1990-01-31 Bosch-Siemens HausgerÀ¤te GmbH Waschtrommel
EP0352439A3 (de) * 1988-07-26 1991-08-07 Bosch-Siemens HausgerÀ¤te GmbH Waschtrommel
KR101125564B1 (ko) * 2005-04-27 2012-03-23 주식회사 대우일렉트로닉스 드럼세탁기의 잔수 순환장치
WO2008003594A1 (de) * 2006-07-06 2008-01-10 BSH Bosch und Siemens Hausgeräte GmbH Waschmaschine mit hohlen mitnehmern
CN101495694B (zh) * 2006-07-06 2011-07-20 Bsh博世和西门子家用器具有限公司 具有空心搅拌器的洗衣机
CN109881429A (zh) * 2019-04-12 2019-06-14 广州市信宏洗衣机械有限公司 一种洗水机
CN109881407A (zh) * 2019-04-12 2019-06-14 广州市信宏洗衣机械有限公司 一种微量雾化洗水机的洗水方法及采用该方法的洗水机
CN109881407B (zh) * 2019-04-12 2021-12-17 广州市信宏洗衣机械有限公司 一种微量雾化洗水机的洗水方法及采用该方法的洗水机

Also Published As

Publication number Publication date
IT8645721A0 (it) 1986-04-17
IT1192078B (it) 1988-03-31

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