EP0152745B1 - Plastic tub for a laundry washing machine - Google Patents

Plastic tub for a laundry washing machine Download PDF

Info

Publication number
EP0152745B1
EP0152745B1 EP85100216A EP85100216A EP0152745B1 EP 0152745 B1 EP0152745 B1 EP 0152745B1 EP 85100216 A EP85100216 A EP 85100216A EP 85100216 A EP85100216 A EP 85100216A EP 0152745 B1 EP0152745 B1 EP 0152745B1
Authority
EP
European Patent Office
Prior art keywords
tub
shell
shells
cam
washing machine
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
Application number
EP85100216A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0152745A2 (en
EP0152745A3 (en
Inventor
Arturo Cinello
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
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 filed Critical Industrie Zanussi SpA
Priority to AT85100216T priority Critical patent/ATE45776T1/de
Publication of EP0152745A2 publication Critical patent/EP0152745A2/en
Publication of EP0152745A3 publication Critical patent/EP0152745A3/en
Application granted granted Critical
Publication of EP0152745B1 publication Critical patent/EP0152745B1/en
Expired 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
    • D06F37/26—Casings; Tubs
    • D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
    • D06F37/262—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements made of plastic material, e.g. by injection moulding
    • 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
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/206—Mounting of motor
    • 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
    • D06F37/26—Casings; Tubs
    • D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
    • D06F37/263—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements assembled from at least two elements connected to each other; Connecting or sealing means therefor
    • 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
    • D06F37/26—Casings; Tubs
    • D06F37/265—Counterweights mounted to the tub; Mountings therefor

Definitions

  • the present invention relates to a tub formed of a plastics material and adapted to be employed in a domestic laundry washing machine of the front-loading type, and improved so as to facilitate and render more economical the manufacture and use of a machine of this type.
  • washing tubs for the specified purpose consisting of two half-shells bolted together.
  • This type of tubs suffers from the drawback of not being integrally provided with lugs or similar means for the fixation of counterweights or equilibration weights, so that these weights have to be secured to the tub by means of annular metal clamps, or have to be injected into cavities integrally formed with the tub.
  • the weights secured to the outer walls of the tub are formed of a cement mixture which is compressed so as to increase its density. For obvious reasons, this compression cannot be carried out on a cement mixture injected into the tub cavities, resulting in a greater volume of the cement mixture for a given weight.
  • the cavities have to be formed with anchoring studs or the like for avoiding noisy vibrations of the cement mixture during the laundering operation.
  • a further disadvantage of known plastic tubs of this type results from their perfectly circular shape which requires the diameter of the tub to be substantially greater than that of the washing drum so as to define therebetween a space of sufficiently great dimensions for the installation of resistance heater elements.
  • the fact that the tub is perfectly circular obviously results in a disadvantageous increase of the space required by the tub within the housing of the washing machines at locations not required for the installation of heater elements.
  • the discharge opening is formed exactly at the center of the lower portion of the tub, so that at least part of the detergent supplied to the tub with the first water charge enters the discharge system and remains therein without being used unless there is a recirculation passage between the discharge system and an additional opening of the tub.
  • a bellows-type discharge conduit has its distal end connected to a filter element itself connected to the intake of a discharge pump mounted in the housing of the machine.
  • This construction obviously requires an increased number of connections and thus numerous manual operations for assembly.
  • the tension of the transmission belt is adjusted by varying the position of the motor with respect to the tub.
  • At least a pair of the openings formed in the studs of the tub are of arcuately elongate shape so as to permit the motor to be adjusted to the desired position.
  • This adjustment operation likewise requires a sequence of manual operations and is practically incapable of positively achieving and maintaining the desired tension of the belt.
  • a further disadvantage encountered in conventional tubs results from the arrangement and construction of a rubber tubing connecting the tub to a detergent distributor and additionally acting as a syphon for trapping a quantity of water sufficient for obstructing the water inlet conduit so as to preclude the escape of steam generated during operation of the washing machine.
  • a washing tub made of a plastics material for a domestic laundry washing machine of the front-loading type, said tub being formed of two half-shells of substantially cylindrical shape interconnected in longitudinal alignment by means of respective flanges bolted together, and provided with means for the supply and discharge of washing liquids, means for filtering the liquids during the discharge phase, and means for the fixation of counterweights, for the adjustable mounting of drum actuating means, and for the connection of the tub to the housing of the washing machine, said tub being characterized in that the two half-shells comprise respective and adjacent lower portions of their internal surface having a planar profile, the forward half-shell comprising an integrally formed discharge opening disposed laterally of said portion, and a filter body directly communicating with said discharge opening, the rear half-shell comprising cam means for tensioning a transmission belt connecting the shaft of a motor to a pulley fixedly secured to the drum shaft.
  • the washing tub according to the invention is composed of two half-shells, namely, as shown in fig. 2, a forward half-shell 6 and a rear half-shell 7 formed of a thermoplastic material by compression moulding or the like method.
  • Half-shells 6 and 7 are of substantially cylindrical shape and joined to one another, with a sealing gasket 39 therebetween, by means of flanges 3 integrally formed along the abutting edges and bolted to one another.
  • the forward half-shell 6 is formed with an opening 8 for charging the drum (not shown) of the machine, with an inlet opening 9 for the washing liquid, and an opening 10 for the discharge of the liquid.
  • inlet opening 9 is formed with a tubular portion projecting from tub 5 and having a flow passage of circular cross-section restricted by a semi-circular wall 11 extending upwards from the lower edge of opening 9 in alignment with the peripheral wall of tub 5.
  • tubular portion of inlet 9 participates in the formation of a syphon which is completed by a rubber sleeve 12 of a considerably simplified design as compared to known embodiments.
  • the two half-shells 6 and 7 are formed with corresponding lower portions 14,14' of their interior wall surface having a planar profile.
  • Planar portions 14, 14' are disposed in alignment with one another so as to constitute a substantially planar bottom of tub 5.
  • discharge opening 10 is offset with respect to the vertical axis of tub 5 and in direct communication with a filter body 13 which in the tub 5 according to the invention is advantageously formed integral with forward half-shell 6.
  • discharge opening 10 is located adjacent a margin of planar bottom 14, 14' and at the downstream side thereof with respect to the direction of rotation (indicated by an arrow in fig. 1) of the drum containing the laundry to be laundered.
  • planar configuration of the bottom of tub 5 and the integration of filter body 13 ensure that on charging tub 5 the detergent carried by the water accumulates preferentially on the planar bottom 14,14', and to a smaller degree on the bottom of filter body 13, which may itself be considered as part of the bottom of tub 5, so that the detergent accumulated thereon is put into circulation by the turbulence created by the movements of the drum.
  • Filter body 13 is formed with an outer main opening 15 for the removable installation of a filter partition 16 integrally formed with an expansion plug 17 for hermetically sealing the filter body, and with a secondary opening 18 for connection to the intake of a circulation pump 19 with suitable sealing gaskets inserted therebetween.
  • Circulation pump 19 is not secured to the housing of the washing machine, but to a suitably formed flange 3 of the tub 5 according to the invention, as shown in fig. 1. This is particularly advantageous, as it reduces the necessity of manual operations for installation and thus permits the tub to be assembled in a highly automatized process.
  • the offset position of discharge opening 10 is effective to promote the discharge flow during the centrifuging phase, as the opening is directed opposite to the flow direction of the liquid resulting from rotation of the drum. This improves the discharge of the liquid during the centrifuging phase without the use of deflecting baffles. It is also to be noted that the planar bottom portion 14, 14' of tub 5 is effective to form an enlarged space between the tub and the drum adjacent discharge opening 10.
  • This enlarged space is advantageously employed for housing a resistance heater element 20 which may thus be accommodated without excessively increasing the dimensions of tub 5 so as to save valuable space within the housing accommodating the tub.
  • annular collar 21 Also integrally formed with forward half-shell 6 is an annular collar 21 provided with bores for securing thereto a forward counterweight 22 by means of screws 23 cooperating with expansion dowels.
  • This solution for the fixation of the counterweight is also particularly advantageous with a view to completely automatized assembly of the tub.
  • an L-shaped lug 24 is formed integrally with forward half-shell 6 and projecting outwards from the bottom portion thereof.
  • flange means 26 Integrally formed with rear half-shell 7 are flange means 26 for securing an upper counterweight 28 by means of screws 27 cooperating with expansion dowels, and an L-shaped lug 29 in coaxial alignment with lug 24 of forward half-shell 6.
  • the two lugs 24 and 29 are adapted to engage a corresponding pair of anchoring studs 30, 31 projecting from the body of motor 25, threaded fastener means 32 being provided to secure motor 25 to lug 24.
  • a further anchoring point is provided for motor 25 in the form of a support bracket 33 engaging a horizonzally disposed bolt 34.
  • Bolt 34 is integrally connected to a cam 35 having a toothed cam profile extending along a spiral curve of progressively increasing radius with respect to its mounting axis.
  • toothed profile of cam 35 cooperates with a toothed sector 36 formed at the lower part of rear half-shell 7 (fig. 1).
  • toothed sector 36 may be formed at the base of a lug having an elongate opening for guiding bolt 34 as it follows a downwards displacement of motor 25.
  • the free end of the toothed profile of cam 35 is connected to toothed sector 36 through a tension spring 37 biasing cam 35 together with bolt 34 in anticlockwise direction. This arrangement is effective to automatically tension a transmission V-belt 41.
  • transmission belt 41 is tensioned by merely pushing down motor 25 by exerting pressure on a pulley 42 secured to the motor shaft, permitting cam 35 to be rotated together with bolt 34 to a position in which its toothed profile is reengaged with toothed sector 36.
  • belt 41 is tensioned to the desired degree with a reliability unattainable by known manual adjustment means.
  • the described tensioning means is also useful for compensating elongation of belt 41 during operation of the laundry washing machine.
  • cam 35 is constantly biased by spring 37 in a direction for displacing bolt 34 so as to automatically ensure proper tensioning of belt 41.
  • the tub 5 according to the invention also solves the problem of providing a suitably formed edge surrounding the forward loading opening 8 during the tub forming process.
  • this edge is designed to cooperate with annular clamp means for securing a bellows connecting the tub to the door opening of the housing of the washing machine.
  • the edge of opening 8 is formed with an L-shaped cross- sectional profile terminating in a broadened rim 43.
  • a connecting bellows 44 has an inner end portion formed with a channel-shaped cross-section for receiving the broadened rim of opening edge 43 and secured thereto by means of a compression ring 45 having a U-shaped profile for clampingly retaining the end portion of bellows 44 on the broadened rim 43.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Cleaning In General (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
EP85100216A 1984-02-13 1985-01-11 Plastic tub for a laundry washing machine Expired EP0152745B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100216T ATE45776T1 (de) 1984-02-13 1985-01-11 Laugenbehaelter aus kunststoff fuer eine waschmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45706/84A IT1181072B (it) 1984-02-13 1984-02-13 Vasca in materia plastica per macchine lavabiancheria
IT4570684 1984-02-13

Publications (3)

Publication Number Publication Date
EP0152745A2 EP0152745A2 (en) 1985-08-28
EP0152745A3 EP0152745A3 (en) 1987-05-27
EP0152745B1 true EP0152745B1 (en) 1989-08-23

Family

ID=11257424

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100216A Expired EP0152745B1 (en) 1984-02-13 1985-01-11 Plastic tub for a laundry washing machine

Country Status (5)

Country Link
EP (1) EP0152745B1 (es)
AT (1) ATE45776T1 (es)
DE (1) DE3572516D1 (es)
ES (1) ES8601353A1 (es)
IT (1) IT1181072B (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005052243A1 (de) * 2003-11-27 2005-06-09 BSH Bosch und Siemens Hausgeräte GmbH Waschmaschine mit einem behälter für wäsche
US9200838B2 (en) 2009-05-28 2015-12-01 Lg Electronics Inc. Laundry machine having a drying function

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1250375B (it) * 1991-01-30 1995-04-07 Zanussi Elettrodomestici Vasca zavorrata per macchine lavatrici
IT221916Z2 (it) * 1991-09-27 1994-12-29 Whirlpool Italia Dispositivo di scarico per macchine lavabiancheria e simili
IT1259238B (it) * 1992-12-07 1996-03-11 Zanussi Elettrodomestici Lavabiancheria con vasca perfezionata in plastica.
US5881909A (en) * 1993-02-01 1999-03-16 Maytag Corporation Plastic washing machine basket
IT1267595B1 (it) * 1994-11-08 1997-02-07 Zanussi Elettrodomestici Macchina per il lavaggio con strutture perfezionate
EP0750064A1 (en) * 1995-06-24 1996-12-27 Whirlpool Europe B.V. Fixing method for a domestic washing machine motor, and the resultant washing machine
EP0799926B1 (en) * 1996-03-21 2004-08-04 BSH Bosch und Siemens Hausgeräte GmbH Subjection system for washing machine counterweight
DE19633705A1 (de) * 1996-08-21 1998-02-26 Bosch Siemens Hausgeraete Waschmaschine mit einem aus Kunststoff geformten Laugenbehälter
ES2151330B1 (es) * 1997-01-21 2001-06-16 Balay Sa Sistema de cierre mejorado para cuba plastica de lavadora.
ES2154536B1 (es) * 1998-02-19 2001-11-01 Balay Sa Sistema de sujecion del motor a la cuba de lavadoras.
ES2162530B1 (es) * 1998-05-22 2002-08-01 Balay Sa Sistema de sujecion del motor de lavadoras a la cuba.
ES2154980B1 (es) * 1998-06-10 2001-11-16 Balay Sa Sistema de sujecion del contrapeso frontal a la cuba de lavadoras.
IT1308702B1 (it) * 1999-02-16 2002-01-10 Iar Siltal Spa Macchina lavabiancheria
FR2818669B1 (fr) * 2000-12-26 2003-04-25 Ciapem Dispositif permettant de realiser une recirculation de fluide destine notamment a un lave-linge
ES2241404B1 (es) * 2002-11-06 2006-07-01 Bsh Electrodomesticos España, S.A. Sistema de fijacion de motor a cuba en lavadoras.
ES2239491B1 (es) * 2002-11-27 2006-12-01 Bsh Electrodomesticos España, S.A. Sistema de sujecion de motor a cuba en lavadoras.
KR100833857B1 (ko) 2005-05-31 2008-06-02 엘지전자 주식회사 세탁 장치
KR100803126B1 (ko) * 2005-05-31 2008-02-14 엘지전자 주식회사 세탁 장치 및 그의 제어 방법
WO2006129916A1 (en) 2005-05-31 2006-12-07 Lg Electronics Inc. Laundry machine
KR20100080415A (ko) 2008-12-30 2010-07-08 엘지전자 주식회사 세탁장치
US9828715B2 (en) 2009-05-28 2017-11-28 Lg Electronics Inc. Laundry maching having a drying function
KR101692727B1 (ko) 2009-05-28 2017-01-04 엘지전자 주식회사 세탁장치
KR101644884B1 (ko) 2009-05-28 2016-08-03 엘지전자 주식회사 세탁장치
KR101689604B1 (ko) 2009-05-28 2017-01-09 엘지전자 주식회사 세탁장치
EP2405050A1 (en) * 2010-07-08 2012-01-11 Electrolux Home Products Corporation N.V. Washing machine
DE102010062913A1 (de) * 2010-12-13 2012-06-14 BSH Bosch und Siemens Hausgeräte GmbH Hausgerät zur Pflege von Wäschestücken mit einem Laugenbehälter, welcher bewegungsfest mit dem Gehäuse des Hausgeräts verbunden ist

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU49899A1 (es) * 1965-11-22 1966-01-22
FR1533675A (fr) * 1967-08-04 1968-07-19 Siemens Elektrogeraete Gmbh Machine à traiter le linge, destinée au lavage et à l'essorage
CH73569A4 (es) * 1969-01-20 1972-08-31
IT1067355B (it) * 1976-08-02 1985-03-16 Eurodomestici Ind Riunite Vasca per macchina lavabiancheria
IT1136452B (it) * 1980-07-03 1986-08-27 Zanussi A Spa Industrie Vasca in materia plastica per macchine lavabiancheria

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005052243A1 (de) * 2003-11-27 2005-06-09 BSH Bosch und Siemens Hausgeräte GmbH Waschmaschine mit einem behälter für wäsche
DE10355452A1 (de) * 2003-11-27 2005-06-23 BSH Bosch und Siemens Hausgeräte GmbH Waschmaschine mit einem Behälter für Wäsche
US9200838B2 (en) 2009-05-28 2015-12-01 Lg Electronics Inc. Laundry machine having a drying function
US9255353B2 (en) 2009-05-28 2016-02-09 Lg Electronics Inc. Laundry machine having a drying function

Also Published As

Publication number Publication date
IT1181072B (it) 1987-09-23
ES539434A0 (es) 1985-11-01
IT8445706A0 (it) 1984-02-13
ES8601353A1 (es) 1985-11-01
ATE45776T1 (de) 1989-09-15
EP0152745A2 (en) 1985-08-28
EP0152745A3 (en) 1987-05-27
IT8445706A1 (it) 1985-08-13
DE3572516D1 (en) 1989-09-28

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