EP0154857A2 - Reibungsdämpfer für eine Waschmaschine - Google Patents

Reibungsdämpfer für eine Waschmaschine Download PDF

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Publication number
EP0154857A2
EP0154857A2 EP85101907A EP85101907A EP0154857A2 EP 0154857 A2 EP0154857 A2 EP 0154857A2 EP 85101907 A EP85101907 A EP 85101907A EP 85101907 A EP85101907 A EP 85101907A EP 0154857 A2 EP0154857 A2 EP 0154857A2
Authority
EP
European Patent Office
Prior art keywords
tub
plate member
friction
washing machine
jaws
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Withdrawn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
EP85101907A
Other languages
English (en)
French (fr)
Other versions
EP0154857A3 (de
Inventor
Luigi Bergomo
Anteo Ceschin
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
Publication of EP0154857A2 publication Critical patent/EP0154857A2/de
Publication of EP0154857A3 publication Critical patent/EP0154857A3/de
Withdrawn legal-status Critical Current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
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations

Definitions

  • the present invention relates to a friction dampening device for the washing assembly of a laundry washing machine, particularly a laundry washing machine for domestic use, and specifically to an improved dampening device adapted to render operation of a laundry washing machine more reliable and comfortable.
  • laundry washing machines for domestic use have an outer housing surrounding a resiliently mounted laundering tub itself housing a rotatable drum adapted to contain the laundry.
  • the laundering tub is usually connected to the outer housing of the machine by upper suspension springs and an arrangement of lower dampener devices effective to dampen oscillations resulting from rotation of the drum during various laundering phases, which would otherwise be transmitted to the outer housing so as to set up undesirable vibrations therein.
  • dampening devices most commonly used in domestic laundry washing machines comprise at least one plate member secured to a lower portion of the tub and received between a pair of friction jaws anchored to the bottom of the outer housing and spring-biased into engagement with the plate member.
  • oscillations may for instacne result from the centrifugation of a reduced charge of laundry in a laundry w washing machine of the type in which the actuating motor does not provide a laundry distribution or equilibration phase preceding the centrifuging phase proper.
  • the reduced charge of laundry remains concentrated at an excentric position within the drum, result- i n g in a considerably unbalanced state of the laundering tu b .
  • the component of this desequilibrium When the component of this desequilibrium is directed downwards, it induces an oppositely directed reaction of the suspension springs, resulting in vertical oscillations of such an amplitude that the entire laundry washing machine starts jumping, with the consequent shocks and countershocks which are particularly damaging to the electric and mechanic components of the machine.
  • dampening devices in which the dampen- i n g capacity of a piston displaceable in frictional en- gag e ment with a central guide bar and with the interior walls of a cylindrical housing is variable by forming the upper portion of the guide bar with inclined grooves cooperating with resilient elements of the piston so as to increase the friction between the latter and the surfaces in frictional engagement therewith.
  • dampening devices of this type are composed of numerous parts, thus requiring numerous operations for manufacture and assembly and rendering maintenance operations difficult.
  • a further object of the invention is the provision of a dampening device which in addition to the advantage set forth above offers the advantage of a particularly simple construction so as to facilitate the manufacture and operation of a laundry washing machine for which it is intended.
  • a frictional dampening device for the tub of a laundry washing machine, particularly for a laundering tub housing a rotatable drum for containing the laundry to be laundered and resiliently mounted in the housing of a domestic laundry washing machine, comprising at least one plate member secured at one and to the bottom surface of the tub and having its other end retained between a pair of friction jaws biased into engagement therewith by the ends of a compression spring anchored to the bottom of the housing of the laundry washing machine, and characterized in that said plate member is foremd with friction surfaces diverging from the zone contacted by said friction jaws when said laundering tub is in its rest position, and in that said friction jaws, formed with friction surfaces continually contacting said plate member over their full area, are connected to the respective ends of said compression spring by means of ball-and-socket joints.
  • Shown in fig. 1 is a conventional laundry washing machine 5 having a laundering tub 6 resiliently mounted within a housing 7 by means of suspension springs 8 and a frictionaL dampening device 9, and a drum 10 for containing the laundry to be laundered.
  • Drum 10 is mounted for rotation within tub 6 by the action of a motor 11 and a transmission belt 12 connecting a pulley 13 of motor 11 to a pulley 14 of drum 10.
  • each plate memebr 15 Associated to each plate memebr 15 is a pair of friction jaws 16, 17 biased into engagement with opposing surfaces of plate member 15 by respective ends 18, 19 of a compression sprign 20 secured to the bottom of housing 7 of laundry washing machine 5 (Fig. 2).
  • plate member 15 is formed with friction surfaces progressively diverging from bottom to top. As a result, the frictional force between the divergent surfaces of plate member 15 and the two jaws 16, 17 increases in direct proportion to the downward movement of plate member 15, and thus of laundering tub 6 to which it is secured.
  • each friction jaw 16, 17 is connected to the respective end 18, 19 of compression spring 20 by means of a ball-and-socket joint 21 permitting the friction surfaces 22 of the jaws to be kept in continuous and uniform contact with the facing friction surfaces of plate member 15.
  • the dampening device 9 according to the invention is additionally effective to reduce the amplitude and thus the duration of the oscillations of the laundering assembly in direct proportion to the force causing such oscillations, so as to ensure an improved stability of the laundry washing machine in any operating condition.
  • Plate memebr 15 may thus be formed with substantially concave friction surfaces, so as to achieve a proportional increase of the friction between the friction jaws and the plate member in any direction of displacement of tub 6, these and other modifications being included within the scope of the patent claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
EP85101907A 1984-03-12 1985-02-21 Reibungsdämpfer für eine Waschmaschine Withdrawn EP0154857A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT3401684U 1984-03-12
ITPN1984U34016U IT8434016U1 (it) 1984-03-12 1984-03-12 Perfezionamenti ai dispositivi ammortizzatori ad attrito per lavabiancheria

Publications (2)

Publication Number Publication Date
EP0154857A2 true EP0154857A2 (de) 1985-09-18
EP0154857A3 EP0154857A3 (de) 1987-08-19

Family

ID=11238673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101907A Withdrawn EP0154857A3 (de) 1984-03-12 1985-02-21 Reibungsdämpfer für eine Waschmaschine

Country Status (3)

Country Link
EP (1) EP0154857A3 (de)
ES (1) ES284990Y (de)
IT (1) IT8434016U1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0228518A3 (en) * 1985-12-16 1988-02-10 Fritz Bauer + Sohne Ohg Frictional damper, particularly for washing machines
DE3626065A1 (de) * 1986-08-01 1988-02-11 Bauer Fritz & Soehne Ohg Reibungs-daempfer fuer waschmaschinen
FR2610017A1 (fr) * 1987-01-27 1988-07-29 Ciapem Lave-linge muni d'amortisseurs
US4977146A (en) * 1989-06-08 1990-12-11 Merck & Co., Inc. 2,5-diaryl tetrahydrofurans and analogs thereof as PAF antagonists
KR20040018752A (ko) * 2002-08-27 2004-03-04 삼성전자주식회사 드럼세탁기

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544679A (en) * 1939-11-07 1942-04-23 Westinghouse Electric Int Co Improvements in or relating to washing machines
US2692681A (en) * 1949-12-16 1954-10-26 Easy Washing Machine Corp Centrifuge support
GB877164A (en) * 1959-05-06 1961-09-13 Westinghouse Electric Corp Vibration dampers and laundry apparatus embodying the same
DE1585595A1 (de) * 1967-07-08 1970-09-24 Bosch Hausgeraete Gmbh Waeschebehandlungsmaschine
FR2358497A1 (fr) * 1976-07-13 1978-02-10 Thomson Brandt Machine a laver le linge munie de dispositifs d'amortissement
FR2540207B1 (fr) * 1983-01-31 1988-06-10 Martinez Mathias Systeme de support et d'amortissement des mouvements d'une piece ou d'une machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0228518A3 (en) * 1985-12-16 1988-02-10 Fritz Bauer + Sohne Ohg Frictional damper, particularly for washing machines
DE3626065A1 (de) * 1986-08-01 1988-02-11 Bauer Fritz & Soehne Ohg Reibungs-daempfer fuer waschmaschinen
FR2610017A1 (fr) * 1987-01-27 1988-07-29 Ciapem Lave-linge muni d'amortisseurs
US4977146A (en) * 1989-06-08 1990-12-11 Merck & Co., Inc. 2,5-diaryl tetrahydrofurans and analogs thereof as PAF antagonists
KR20040018752A (ko) * 2002-08-27 2004-03-04 삼성전자주식회사 드럼세탁기

Also Published As

Publication number Publication date
ES284990U (es) 1985-08-01
EP0154857A3 (de) 1987-08-19
ES284990Y (es) 1986-12-16
IT8434016V0 (it) 1984-03-12
IT8434016U1 (it) 1985-09-12

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Inventor name: CESCHIN, ANTEO

Inventor name: BERGOMO, LUIGI