EP2336414B1 - Gegengewicht für Waschmaschinen - Google Patents

Gegengewicht für Waschmaschinen Download PDF

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Publication number
EP2336414B1
EP2336414B1 EP20090179860 EP09179860A EP2336414B1 EP 2336414 B1 EP2336414 B1 EP 2336414B1 EP 20090179860 EP20090179860 EP 20090179860 EP 09179860 A EP09179860 A EP 09179860A EP 2336414 B1 EP2336414 B1 EP 2336414B1
Authority
EP
European Patent Office
Prior art keywords
ballast
counterweight unit
connecting element
segments
closed
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.)
Not-in-force
Application number
EP20090179860
Other languages
English (en)
French (fr)
Other versions
EP2336414A1 (de
Inventor
Marco Pessot
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP20090179860 priority Critical patent/EP2336414B1/de
Publication of EP2336414A1 publication Critical patent/EP2336414A1/de
Application granted granted Critical
Publication of EP2336414B1 publication Critical patent/EP2336414B1/de
Not-in-force legal-status Critical Current
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
    • D06F37/26—Casings; Tubs
    • D06F37/265—Counterweights mounted to the tub; Mountings therefor

Definitions

  • the invention relates to a counterweight unit for a washing machine, a method for forming a counterweight unit and a washing machine comprising such a counterweight.
  • EP 1 918 443 B1 and EP-A1-1,780,320 disclose a counterweight for a washing machine comprising two separate ballast elements screwed to a front wall of the tub.
  • the invention is directed to a counterweight unit for a washing machine, wherein the counterweight unit is mountable to a front wall or flange of a tub of a washing machine, e.g. around a loading opening of the tub.
  • a counterweight unit comprises at least two ballast segments, wherein a closed-loop connecting element, e.g. a ring element, connects each of the at least two ballast segments to its neighbouring ballast segment. Thereby each ballast segment is connected to its adjacent segment and a one-piece counterweight unit is achieved.
  • a closed-loop connecting element comprises for example one, two, three or more rings having a circular or substantially circular shape.
  • at least two connecting elements are provided to connect the at least two ballast elements, wherein each of the connecting elements connects at least an end portion or end section of each the at least two ballast segments to its neighbouring ballast segment. I.e. instead of providing one connecting element to connect all ballast elements, i.e.
  • a closed-loop connecting element a plurality of individual connecting elements are provided to connect neighbouring ballast segments. Both solutions or when the solutions are combined provide a connection between the at least two, three or plurality of ballast segments, whereby an easy-to-handle one-piece counterweight unit is provided. This is particularly advantageous during an assembly process of a washing machine, as only one assembly part, namely the counterweight unit, needs to be handled, transported and positioned during mounting and fixing of the counterweight unit to a washing machine, i.e. to a front shell of a tub.
  • ballast segments are spaced apart, i.e. a spacing or gap is provided between adjacent ballast segments.
  • the closed-loop connecting element bridges the spacings between the neighbouring ballast segments.
  • at least one connecting element of the at least two connecting elements bridges a spacing between neighbouring ballast segments. Due to the spacing between the ballast segments and in dependency of the flexibility of the (closed-loop) connecting elements, the ballast segments are not rigidly coupled to each other. I.e. a relative movement of the ballast segments is only restricted by the connecting element(s) bridging the spacings.
  • ballast segments are separated from each other by spacings, within the tolerance of the (closed-loop) connecting element(s) the ballast segments can be separately adjusted to the front shell or a flange thereof and the connecting element(s) bridging the spacings relieve the stress that would be exerted on a one-piece or rigid counterweight unit.
  • the connecting element(s) bridging the respective spacings are flexible or elastic to an extend to absorb or compensate stress exerted on the counterweight unit. Thereby the lifetime of the counterweight unit is substantially increased, as for example the risk of stress cracks is reduced.
  • the closed-loop connecting element is fixed in the in the at least two ballast segments, e.g. the connecting element is at least partially embedded or anchored in the at least two ballast elements, for example during casting or moulding of the counterweight unit, i.e. of the ballast segments.
  • the connecting element is embedded in the ballast segments, the counterweight unit is reinforced and therefore the mechanical stability is increased, e.g. when using concrete for the ballast segments and iron for the connecting element.
  • a separate fixing step of the connecting element to the ballast segments is not required, whereby the production time of a counterweight unit is reduced.
  • the closed-loop connecting element is fixed to the at least two ballast segments.
  • the closed-loop connecting element circumferentially encloses or envelopes the at least two ballast segments.
  • the closed-loop connecting element is additionally attached or fixed to the ballast segments, e.g. by means of anchoring elements or screws to provide a mechanical stable connection between connecting element and ballast segments.
  • each of the at least two connecting elements is fixed to or fixed in neighbouring ballast segments.
  • a plurality of individual connecting elements are provided for connecting the ballast segments, whereby the required amount of material for connecting the ballast segments is reduced.
  • respective ends of a connecting element are attached to outer surfaces of neighbouring ballast elements.
  • each of the connecting elements is embedded or anchored in neighbouring ballast segments.
  • respective ends of each of the at least two connecting elements comprise an anchor element or portion, which are integrally formed with the connecting element or are separately attached to the connecting element ends.
  • An anchor element or portion has a wider or broader cross section than the remaining part of the connecting element.
  • each of the plurality of connecting elements comprises a rod having broadened end portions, e.g. a double-T form.
  • the connecting elements can be embedded or anchored in the ballast segments during casting or moulding of the ballast segments.
  • the stability of the counterweight unit and the ballast segments is further increased by using fiber reinforced concrete, using for example steel fibers, glass fibers, synthetic fibers or natural fibers.
  • the closed-loop connecting element and/or the at least two connecting elements are adapted to allow a deflection or displacement between the at least two ballast segments when stress is exerted on the counterweight unit.
  • a ballast element is displaced with respect to the other or a neighbouring ballast element during fixing or screwing of the counterweight unit to a tub front shell.
  • the connection between the ballast elements is elastic or flexible, i.e. a flexible counterweight unit is provided.
  • a connection compensates manufacturing tolerances or non-planarity of a flange of a front tub shell or of the counterweight unit as described above.
  • the closed-loop connecting element comprises at least one wire element, e.g. one ring shaped wire.
  • more than one wire ring can be used as a closed-loop connecting element.
  • the closed-loop connecting element comprises a strip element, like a metal strip. Wire elements, rod elements and/or strip elements can also be used to form the plurality of connecting elements.
  • At least two connecting elements are provided to connect neighbouring ballast segments, i.e. two connecting elements bridge a spacing between adjacent ballast segments. Thereby the connection between the ballast segments is reinforced.
  • Preferably more than two connecting elements are provided to span or bridge a spacing between adjacent ballast segments to further reinforce the connection and therefore the counterweight unit.
  • each of the at least two ballast segments comprises at least one mounting point, preferably a maximum of three mounting points, in particular mounting holes.
  • Each ballast segment and therefore the counterweight unit is fixed to a tub or front shell thereof by or through the mounting points, for example by means of screws or the like.
  • Three mounting or fixing points span a plane, i.e. as only a maximum of three mounting points or holes per ballast segment are provided, less stress is exerted on each ballast segment, e.g. due to manufacturing tolerances between counterweight unit and a flange of a front tub shell as described above.
  • each of the at least two ballast segments comprises a partial ring shape, like a divided ring shape, adapted to be arranged around a loading opening of a tub.
  • the ballast segments have not the same circumferential size or dimension, i.e. they are formed asymmetrically.
  • the shape of one of the at least two ballast segments extends over 180° or less and the shape of the other of the at least two ballast segments extends over 180° or more. More preferably the shape of one of the at least two ballast segments extends over 160° or less and the shape of the other of the at least two ballast segments extends over 200° or more.
  • Alternative dimensions of at least two ballast segments comprise a combination of 150° or less and 210° or more.
  • the ballast segments of the counterweight unit are uniformly positioned, such that the weight of the ballast segments is evenly distributed among the counterweight unit.
  • the ballast of the counterweight unit is therefore evenly distributed around a tub opening of a washing machine, i.e. the weight is symmetrically distributed around the rotation axis of a drum.
  • the washing group comprising tub, drum, upper spring and bottom damper.
  • a method for forming a counterweight unit as described above requires a mould which comprises at least two cavities having the form of a partial ballast segment of a counterweight unit, e.g. partial ring cavities to receive concrete therein. Further, at least two narrowed portions or necks are provided to provide a passage between the cavities, wherein the narrowed portions form spacings between the ballast segments of the counterweight unit.
  • the mould also comprises at least one filling hole in each of the partial ring segments for casting or injecting the ballast segment material, e.g. concrete.
  • a closed-loop connecting element is placed in the mould, such that the closed-loop connecting element bridges the at least two narrowed portions.
  • each of the connecting elements bridges a narrowed portion, whereby end portions of the connecting elements are positioned in neighbouring ring segments to provide a connection between them.
  • the transverse cross-section of each of the passages between the cavities corresponds to or essentially corresponds to the cross section of a respective (closed-loop) connecting element.
  • a multi-part and fixedly interconnected counterweight unit is formed in only one moulding step, ready to be fixed to a washing machine or a front tub shell thereof.
  • the mould is composed of at least two shell-parts, e.g. at least one upper and one lower shell-part, wherein each shell-part comprises depressions forming a portion of a respective one of the passages.
  • the mould comprises respective projections reaching through the ring segments, to form mounting holes for the ballast segments of the counterweight unit during the casting thereof.
  • Fig. 1a depicts a front view of a counterweight unit 1 comprising two ballast segments 2a, 2b, preferably made of concrete or the like.
  • the ballast segments 2a, 2b are connected by a connecting loop 4 or ring, which is embedded in the ballast segments 2a, 2b, wherein the connecting loop 4 is preferably made of metal.
  • Mounting holes 8a-e are provided in each of the ballast segments 2a, 2b to mount the counterweight unit 1 on a front tub shell 10 of a washing machine ( Fig. 3b ).
  • the ballast segments 2a, 2b are positioned such that gaps 6a, 6b are provided between them, wherein the gaps 6a, 6b are bridged by the connecting loop 4.
  • Fig. 1b shows a cross sectional side view of the counterweight unit 1 along the line A-A of Fig. 1a .
  • the cross section of each mounting hole 8e, 8c - representative for all holes 8a-e - are stepped to provide a seat for receiving a washer 16 and screw 14 therein ( Fig. 3a ).
  • Fig. 2 shows a cross sectional front view of the counterweight unit 1 of Fig. 1a , where the ring-like shape of the closed connecting loop 4 is shown.
  • the connecting loop 4 connects the ballast segments 2a, 2b and also provides reinforcement for the segments 2a, 2b.
  • the portions of the connecting loop 4 bridging the gaps 6a, 6b provide flexibility for the counterweight unit 1.
  • each ballast segment 2a, 2b e.g. made of concrete, can independently level out a possible non-planarity or unevenness of a contact plane between the individual segments of the counterweight unit 1 and a front tub shell 10 ( Fig. 3b ).
  • Fig. 3a shows a front view of the counterweight unit 1 of Fig. 1a mounted on a tub 12 of a washing machine.
  • the counterweight unit 1 is positioned around a loading opening 20 of the tub 12 and is fixed to the tub 12 with screws 14a-e through mounting holes 8a-e.
  • the weight or ballast of the counterweight unit 1 is thereby evenly distributed around the rotation axis C of the tub 12, whereby oscillation movements and vibrations during operation of a washing machine are effectively dampened.
  • Fig. 3b shows a cross sectional side view of the assembly of Fig. 3a along the line B-B.
  • a front tub shell 10 is attached to the tub 12 of a washing machine, wherein the mounting points at holes 8c, 8e represent all mounting points of holes 8a-e of the counterweight unit.
  • the front tub shell 10 comprises protrusions 18c, 18e which are received in the respective mounting holes 8c, 8e, wherein the protrusions 18c, 18e comprise a screw hole to receive screws 14c, 14e.
  • the protrusions 18c, 18e are preferably casted or formed integrally with the front tub shell 10.
  • the counterweight unit 1 is mounted by screws 14c, 14e and washers 16c, 16e to the front tub shell 10 such that the ballast weight of the counterweight unit 1 is evenly distributed around the rotation axis C.
  • Fig. 4 shows a detail of an alternative connecting element 5 between ballast segments 2a', 2b' in a cross sectional side view.
  • the alternative connecting element 5 depicted in Fig. 4 replaces the connecting loop 4 as shown in Fig. 1a , i.e. at least one connecting element 5 is provided for each gap 6a' (corresponding to gaps 6a, 6b).
  • the ballast segments 2a', 2b' correspond to the ballast segments 2a, 2b of Fig. 1a , wherein the ballast segments 2a', 2b' are preferably made of fiber reinforced concrete.
  • the gap 6a' between ballast segments 2a', 2b' is bridged by a connecting element 5 which comprises broadened anchor ends 7a, 7b.
  • the anchor ends 7a, 7b are embedded and thereby anchored in the neighbouring ballast segments 2a', 2b'.
  • Fig. 5a shows a schematic top view inside a lower shell 26 of a mould for forming a counterweight unit 1.
  • the lower shell 26 comprises cavities 22a', 22b' forming at least a portion of the ballast segments 2a, 2b of a counterweight unit 1 therein.
  • Channels or passages 24a', 24b' connect the cavities 22a', 22b'.
  • Fig. 5b shows a cross sectional side view of a in the region of a passage of a mould comprising a lower shell 26 as depicted in Fig. 5a joined to or assembled with an upper shell 28.
  • the passage 24a between cavities 22a, 22b is provided by corresponding depressions of the upper and lower shells 26, 28.
  • a connecting loop 4 is placed in the lower shell 26, such that the connecting loop 4 bridges the passages 24a, 24b, i.e. such that the loop 4 lies within the passages 24a, 24b or narrowed portions.
  • connecting elements 5 as depicted in Fig. 4 are placed across the passages 24a, 24b.
  • the transverse cross-section of the passage 24a, 24b corresponds to the cross section of the connecting loop 4, connecting element 5 or the respective total cross section of a combination of (loop) connecting elements, which are used to connect the ballast cavities 22a, 22b.
  • the upper shell 28 is joined to or assembled with the lower shell 26 ( Fig.
  • ballast material is filled or injected into the assembled mould through at least one filling hole (not shown) in each of the cavities 22a, 22b, e.g. filling holes in the upper shell 28.
  • the mould is removed when the ballast material inside the mould is hardened or set and the finished counterweight unit 1 is ready-to-use, i.e. ready for mounting to a tub shell of a washing machine.

Landscapes

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

Claims (10)

  1. Gegengewichteinheit, umfassend mindestens zwei Ballastsegmente (2a, 2b) und ein Verbindungselement in Form einer geschlossenen Schleife (4), das jedes der mindestens zwei Ballastsegmente (2a, 2b) mit seinem benachbarten Ballastsegment verbindet,
    dadurch gekennzeichnet, dass
    die benachbarten Ballastsegmente (2a, 2b) voneinander beabstandet sind und das Verbindungselement in Form einer geschlossenen Schleife (4) die Abstände (6a, 6b) zwischen benachbarten Ballastsegmenten (2a, 2b) überbrückt, wobei jedes der mindestens zwei benachbarten Ballastsegmente (2a, 2b) mindestens einen Montagepunkt (8a-e), vorzugsweise maximal drei Montagepunkte, umfasst, um die Gegengewichteinheit an einer Waschmaschine zu befestigen, insbesondere an ihrem vorderen Laugenbehältermantel (10).
  2. Gegengewichteinheit nach Anspruch 1, wobei das Verbindungselement in Form einer geschlossenen Schleife (4) an oder in den mindestens zwei Ballastsegmenten (2a, 2b) befestigt ist.
  3. Gegengewichteinheit nach einem der vorhergehenden Ansprüche, wobei jedes der mindestens zwei Ballastsegmente (2a, 2b) eine teilweise Ringform aufweist, wobei ein erstes der mindestens zwei Ballastsegmente (2b) eine Umfangsausdehnung von etwa 175° oder weniger aufweist und ein zweites der mindestens zwei Ballastsegmente eine Umfangsausdehnung von etwa 185° oder mehr (2a) aufweist.
  4. Gegengewichteinheit nach einem der vorhergehenden Ansprüche, wobei das Verbindungselement in Form einer geschlossenen Schleife (4) geeignet ist, zwischen den mindestens zwei Ballastsegmenten (2a, 2b) eine Auslenkung von mindestens einem Grad, vorzugsweise mindestens 3 Grad und insbesondere mindestens 5 Grad zu ermöglichen.
  5. Gegengewichteinheit nach einem der vorhergehenden Ansprüche, wobei das Verbindungselement in Form einer geschlossenen Schleife (4) mindestens ein Drahtelement und/oder mindestens ein Streifenelement umfasst.
  6. Gegengewichteinheit nach einem der vorhergehenden Ansprüche, wobei das Material des Verbindungselements in Form einer geschlossenen Schleife (4) aus Metall oder Kunststoff ausgewählt wird.
  7. Gegengewichteinheit nach einem der vorhergehenden Ansprüche, wobei das Material der mindestens zwei Ballastsegmente (2a, 2b) aus Beton oder faserverstärktem Beton ausgewählt wird.
  8. Waschmaschine, umfassend eine Gegengewichteinheit (1) nach einem der vorhergehenden Ansprüche.
  9. Verfahren zur Herstellung einer Gegengewichteinheit, insbesondere einer Gegengewichteinheit nach einem der vorhergehenden Ansprüche, wobei das Verfahren Folgendes umfasst:
    Bereitstellen einer Form, umfassend:
    mindestens zwei Hohlräume (22a, 22b), die jeweils die äußere Form eines teilweisen Ballastsegments (2a, 2b) aufweisen;
    mindestens zwei verengte Abschnitte, die einen Übergang (24a, 24b) zwischen den mindestens zwei Hohlräumen (22a, 22b) schaffen; und
    mindestens eine Einfüllöffnung in jedem der Hohlräume (22a, 22b);
    Anordnen eines Verbindungselements in Form einer geschlossenen Schleife (4) in der Form, so dass das Verbindungselement in Form einer geschlossenen Schleife (4) die mindestens zwei verengten Abschnitte überbrückt, und
    Füllen der Form mit Ballastmaterial,
    wobei der Querschnitt von jedem der Übergänge (24a, 24b) zwischen den Hohlräumen (22a, 22b) dem äußeren Querschnitt eines jeweiligen Verbindungselements in Form einer geschlossenen Schleife (4) und/oder Verbindungselements (5) entspricht oder im Wesentlichen entspricht.
  10. Verfahren nach Anspruch 9, wobei die Form aus mindestens zwei Gehäuseteilen gebildet ist, wobei
    ein erster Gehäuseteil (26) erste Vertiefungen aufweist, die jeweils mindestens einen Abschnitt eines entsprechenden der Übergänge (24a, 24b) bilden, und/oder
    ein zweiter Gehäuseteil (28) zweite Vertiefungen aufweist, die jeweils mindestens einen Abschnitt eines entsprechenden der Übergänge (24a, 24b) bilden.
EP20090179860 2009-12-18 2009-12-18 Gegengewicht für Waschmaschinen Not-in-force EP2336414B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20090179860 EP2336414B1 (de) 2009-12-18 2009-12-18 Gegengewicht für Waschmaschinen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20090179860 EP2336414B1 (de) 2009-12-18 2009-12-18 Gegengewicht für Waschmaschinen

Publications (2)

Publication Number Publication Date
EP2336414A1 EP2336414A1 (de) 2011-06-22
EP2336414B1 true EP2336414B1 (de) 2012-07-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090179860 Not-in-force EP2336414B1 (de) 2009-12-18 2009-12-18 Gegengewicht für Waschmaschinen

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EP (1) EP2336414B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101745890B1 (ko) 2010-12-20 2017-06-20 삼성전자주식회사 세탁기
CN103255599B (zh) * 2012-02-20 2015-07-15 苏州三星电子有限公司 滚筒洗衣机及其平衡结构

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4444254C1 (de) * 1994-12-13 1996-06-13 Miele & Cie Laugenbehälter für Waschmaschinen, insbesondere für Trommelwaschmaschinen
ITMI20052031A1 (it) * 2005-10-26 2007-04-27 Gianfranco Plazzoli Armatura per contrappeso di elettrodomestici contrappeso incorporante la stessa e suo metodo di produzione
DE102006051714B3 (de) 2006-10-30 2008-01-31 Miele & Cie. Kg Laugenbehälter mit Ballastgewicht für eine Waschmaschine

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