EP0812946B1 - Verfahren zum Herstellen von Gegengewichten für Waschmaschinen - Google Patents

Verfahren zum Herstellen von Gegengewichten für Waschmaschinen Download PDF

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Publication number
EP0812946B1
EP0812946B1 EP97105328A EP97105328A EP0812946B1 EP 0812946 B1 EP0812946 B1 EP 0812946B1 EP 97105328 A EP97105328 A EP 97105328A EP 97105328 A EP97105328 A EP 97105328A EP 0812946 B1 EP0812946 B1 EP 0812946B1
Authority
EP
European Patent Office
Prior art keywords
counterweights
manufacturing
mould
hollow bodies
hollow
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
Application number
EP97105328A
Other languages
English (en)
French (fr)
Other versions
EP0812946A3 (de
EP0812946A2 (de
Inventor
Piero Durazzani
Roberto Quattrin
Gianni Sandrin
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.)
RO-SA PLAST S.P.A.
Electrolux Zanussi SpA
Original Assignee
RO-SA PLAST SpA
Electrolux Zanussi SpA
Ro Plast SpA SA
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.)
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Publication date
Application filed by RO-SA PLAST SpA, Electrolux Zanussi SpA, Ro Plast SpA SA filed Critical RO-SA PLAST SpA
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Publication of EP0812946A3 publication Critical patent/EP0812946A3/de
Application granted granted 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
    • 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

Definitions

  • the present invention refers to a method for manufacturing counterweights for clothes washing machines, in particular of the household type.
  • Clothes washing machines are generally known to be usually provided with counterweights which serve as means for ballasting the same machines so as to reduce the dynamic stresses that are imparted during the rotation of the drum in the washing and, above all, the high-speed spin-extraction phases of the clothes washing process.
  • Such counterweights are generally secured to the exterior of the wash tub and are made in a variety of manners.
  • they are formed by concrete blocks that are given appropriate shapes according to the position in which they are to be mounted, for instance on the front wall or the rear wall of the tub, or even on top of the same tub.
  • Fastening means adapted to co-operate with corresponding attachment means provided on the wall of the tub are inserted in such concrete blocks so as to protrude from said blocks accordingly.
  • Counterweights are also known, which are formed by two annular shells of plastic material adapted to enclose blocks of concrete or any other suitable material having a high specific gravity (US patent no. 5,211,038), as well as counterweights which are formed by moulded flange of plastic material in the shape of a continuous hollow ring with a U-shaped cross-section, said flange being further provided with radial ribs adapted to accomodate, and keep in position, concrete masses (GB-A-2 044 298). Counterweights are also known which are obtained by blow moulding hollow bodies of plastic material that are then filled with concrete or any other material having similar properties.
  • EP 0 515 874 discloses a process and an apparatus for manufacturing a counterweight for washing machines wherein one or more blocks of heavy material is overinjected with a protective shell of plastic material.
  • EP 0 623 436 discloses a counterweight for washing machines made by a shell of plastic material filled with a solidified composition of inert and binding material.
  • important purpose of the present invention is to provide a manufacturing method that enables differently shaped finished counterweights to be manufactured simultaneously, thereby bringing about considerable time saving effects in the manufacturing and processing cycle and, as a result, corresponding saving effects in the overall costs of each single counterweight manufactured according to the proposed method. Furthermore, the method according to the present invention calls for replacing concrete with another filling material, such as preferably mill scale, which is capable of bringing about a further environmental advantage, since it represents a hardly disposable waste material.
  • the counterweights are formed by a hollow body of plastic material which is filled with compacted inert material.
  • the hollow body is manufactured by a blow moulding process, which is a largely known and used method in the art of plastic processing.
  • the plastic material used for such a moulding operation is preferably polypropylene, which is taken from an appropriately provided reservoir 10 and is supplied through a conduit 11 to a blow moulding machine 12.
  • the blow moulding machine 12 comprises a twin-cavity mould 13 ( Figures 2 and 3), wherein a first cavity 14 is used for moulding a hollow body 15 (Figure 4), used for manufacturing an annular counterweight, while a second cavity 16 is used for moulding a hollow body 17 ( Figure 5), used for manufacturing an upper counterweight.
  • the first mould cavity 14 is arranged so as to surround the second mould cavity 16, in such a manner as to enable the hollow bodies 15 and 17, which are both needed usually in the construction of a clothes washing machine, to be moulded simultaneously in said two cavities, respectively.
  • the counterweight that is made out of the hollow body 15 will be applied on to the front wall of the wash tub of the clothes washing machine, while the counterweight that is made out of the hollow body 17 will be applied on to the upper portion of the wash tub of the clothes washing machine.
  • the manufacturing method according to the present invention is mainly characterized in that the process in which the hollow bodies 15 and 17 are moulded is immediately followed by the therewith associated process in which said hollow bodies are filled with high specific-gravity inert material so as to complete the whole counterweight manufacturing process.
  • the cavities 14 and 16 of the mould 13 are connected, through respective conduits 18 and 19 ( Figure 1), with an inert-material mixing and feeding apparatus.
  • Such an apparatus comprises two filling hoppers 21, 22 for the inert material and an additive, respectively, which are contained in respective reservoirs 23 and 24.
  • the inert material used in the process is formed by mill scale, such as oxidized sheet-metal particles.
  • mill scale such as oxidized sheet-metal particles.
  • Such mill scale which forms owing to atmospheric oxidation in the rolling phase at the mill and, when finally removed mechanically from the rolled products, generally becomes a hardly disposable industrial waste material, can in this way be recovered and recycled with a considerable advantage in terms of environment safeguard.
  • this material to be able to be used as a filling material in such counterweights, it shall be charged and mixed with a liquid additive, preferably water. It is therefore provided for the mill scale coming from the reservoir 23, and passing through the hopper 21, and the water flowing from the reservoir 23, and passing through the hopper 22, to be mixed by means of a vertical screw 25, to the lower end portion of which the hoppers 21 and 22 are connected ( Figure 1).
  • the method according to the present invention is further characterized in that the compaction of the inert material used to fill the counterweights is carried out by vibrations.
  • the mould 13 is sustained by springs 26 and is connected to a motor vibrator 27.
  • the vibratory compaction of the counterweight filling material can also be carried out after the counterweights have been removed from the mould. In such a case the processing time would be extended, but the construction of the moulding machine would be made simpler.
  • inert materials derived from wastes and scraps from machining and other mechanical processes can be used in this connection, provided that they can be compacted while however remaining conveniently separable from the hollow container in which they are filled.
  • a further, important advantage of the present invention is obtained when the clothes washing machine provided with the above described counterweights according to the present invention is eventually discarded and scrapped at the end of its life cycle.
  • the materials of which the various parts of the machine are made must in fact be capable of being separated according to their different nature.
  • the counterweights according to the present invention fully comply with such a requirement, since the wrapper of plastic material can be easily cut and separated from the mass of inert material with which it will have not amalgamated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Vehicle Step Arrangements And Article Storage (AREA)
  • Jib Cranes (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Claims (5)

  1. Verfahren zur Herstellung von Gegengewichten für Waschmaschinen, insbesondere für Haushaltwaschmaschinen, welches die Formung von Hohlkörpern aus Kunststoff und das Füllen von diesen mit einem trägen Material mit hoher Wichte umfasst, dadurch gekennzeichnet, dass die Hohlkörper aus Kunststoff (15, 17), während sie sich noch in der Form (13) befinden, mit dem trägen Material, welches mit Wasser vermischt ist, gefüllt werden, und die so gefüllten Hohlkörper aus Kunststoff danach einer Vibrationsbehandlung ausgesetzt werden, um das Füllmaterial innerhalb der Hohlkörper zu verdichten.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Hohlkörper aus Kunststoff (15, 17), die mit trägen Material, welches mit Wasser vermischt ist, gefüllt sind, einer Vibrationsbehandlung ausgesetzt werden, nachdem sie aus ihren jeweiligen Formräumen (14, 16) entnommen wurden.
  3. Verfahren nach einem der vorhergehenden Ansprüche zur Herstellung ringförmiger und oberer Gegengewichte, dadurch gekennzeichnet, dass zur Formung der Hohlkörper aus Kunststoff (15, 17) eine einzige Form (13) mit zwei Formräumen (14, 16) verwendet wird, und der Formraum (16) für ein oberes Gegengewicht innerhalb des Formraumes (14) angeordnet ist, welcher für ein ringförmiges Gegengewicht vorgesehen ist.
  4. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zur Formung der Hohlkörper aus Kunststoff (15, 17) ein Blasformverfahren angewendet wird.
  5. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das träge Füllmaterial, welches zum Füllen der Hohlkörper aus Kunststoff (15, 17) verwendet wird, aus Walzsinterpulver gebildet wird.
EP97105328A 1996-06-11 1997-03-29 Verfahren zum Herstellen von Gegengewichten für Waschmaschinen Expired - Lifetime EP0812946B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN960038 1996-06-11
IT96PN000038A IT1289383B1 (it) 1996-06-11 1996-06-11 Metodo di fabbricazione di contrappesi per macchine lavabiancheria e contrappesi ottenuti con tale metodo

Publications (3)

Publication Number Publication Date
EP0812946A2 EP0812946A2 (de) 1997-12-17
EP0812946A3 EP0812946A3 (de) 1998-09-30
EP0812946B1 true EP0812946B1 (de) 2002-07-24

Family

ID=11395159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97105328A Expired - Lifetime EP0812946B1 (de) 1996-06-11 1997-03-29 Verfahren zum Herstellen von Gegengewichten für Waschmaschinen

Country Status (4)

Country Link
EP (1) EP0812946B1 (de)
DE (1) DE69714150T2 (de)
ES (1) ES2180842T3 (de)
IT (1) IT1289383B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000007274A (ko) * 1998-07-02 2000-02-07 윤종용 드럼세탁기의 웨이트 밸런서
IT1311728B1 (it) * 1999-12-10 2002-03-19 Electrolux Zanussi Elettrodome Procedimento per la fabbricazione di manufatti di rilevante pesospecifico a base di inerti ferrosi e manufatti cosi' realizzati
ES2212734B1 (es) * 2002-12-20 2005-12-16 Julio Beascoechea Bernaola Sistema de produccion de contrapesos.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1250390B (it) * 1991-05-29 1995-04-07 Zanussi Elettrodomestici Procedimento e impianto di fabbricazione di un contrappeso per macchine lavatrici e contrappeso cosi' ottenuto.
IT1264151B1 (it) * 1993-04-20 1996-09-16 Stefano Pescatori Pezzo adatto per costituire massa di equilibramento per macchine, particolarmente elettrodomestici,e procedimento per fabbricare tale

Also Published As

Publication number Publication date
DE69714150D1 (de) 2002-08-29
IT1289383B1 (it) 1998-10-02
DE69714150T2 (de) 2003-02-27
ES2180842T3 (es) 2003-02-16
EP0812946A3 (de) 1998-09-30
EP0812946A2 (de) 1997-12-17
ITPN960038A0 (it) 1996-06-11
ITPN960038A1 (it) 1997-12-11

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