EP3899124B1 - A laundry washer-dryer having a tub with improved mechanical strength - Google Patents

A laundry washer-dryer having a tub with improved mechanical strength Download PDF

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Publication number
EP3899124B1
EP3899124B1 EP19901245.1A EP19901245A EP3899124B1 EP 3899124 B1 EP3899124 B1 EP 3899124B1 EP 19901245 A EP19901245 A EP 19901245A EP 3899124 B1 EP3899124 B1 EP 3899124B1
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EP
European Patent Office
Prior art keywords
tub
rear wall
dryer
radial ribs
laundry washer
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.)
Active
Application number
EP19901245.1A
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German (de)
French (fr)
Other versions
EP3899124A1 (en
EP3899124A4 (en
Inventor
Cahit ATAGUN
Yunus Emre AYDOGDU
Ata MUGAN
Recep Ayas
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.)
Arcelik AS
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Arcelik AS
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Publication date
Application filed by Arcelik AS filed Critical Arcelik AS
Publication of EP3899124A1 publication Critical patent/EP3899124A1/en
Publication of EP3899124A4 publication Critical patent/EP3899124A4/en
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Publication of EP3899124B1 publication Critical patent/EP3899124B1/en
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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
    • D06F37/264—Tubs provided with reinforcing structures, e.g. ribs, inserts, braces
    • 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
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 
    • 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
    • D06F37/267—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups
    • D06F37/269—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups for the bearing of the rotary receptacle

Definitions

  • the present invention relates to a laundry washer-dryer having a tub produced from plastic material.
  • washing and drying processes are realized by placing the laundry into a drum moving in the tub.
  • the tub is produced from rigid thermoplastic material such as polyethylene or polypropylene due its high chemical resistance values and low costs.
  • the drum makes rotational movement in the tub.
  • the unbalanced load caused by the laundry in the drum and the forces generated during the spin-drying step of the laundry washer-dryer strain the tub.
  • Especially the surrounding area around the hub where the shaft rotating the drum is borne in the ball bearing in the tub is subjected to mechanical loads, thus causing wear or cracking risks in time.
  • At least the rear wall of the tub is required to be produced from materials with high mechanical strength, which increases the production costs.
  • a plastic tub for a washing machine which includes a cylindrical casing, and an end face wall sealing the cylindrical casing, wherein the end face includes a bearing mount for a shaft of a laundry drum and radially-aligned reinforcing ribs molded into the end face wall.
  • the reinforcing ribs begin at the bearing mount and branch in a Y-shape along their radial extent.
  • the aim of the present invention is the realization of a laundry washer-dryer which comprises a tub with increased mechanical strength.
  • the rear wall of the tub are provided with inner radial ribs which are in the form of a hyperbolic open curve, which have a curved section and two symmetrical arms which extend symmetrically in the radial direction from the vertex of the curved section towards the tub on the inside, and which are positioned all around the hub.
  • Outer radial ribs which are again in the form of a hyperbolic open curve and which have arms extending from inside to the outside in a direction opposite to the inner radial ribs.
  • the laundry washer-dryer (1) comprises a drum (2) which is rotated around the horizontal axis by a motor (13) and wherein the laundry is placed, a shaft (14) which transmits the movement received from the motor (13) to the drum (2), and a tub (5) wherein the drum (2) moves, which is produced from plastic (rigid thermoplastic) and which has a circular front wall with the laundry loading opening arranged at the center thereof, a cylindrical side wall, a circular rear wall (3) and a hub (4) which is arranged at the rear wall (3) and where the shaft (14) is borne with the ball bearing (15).
  • plastic rigid thermoplastic
  • the laundry washer-dryer (1) of the present invention comprises a plurality of inner radial ribs (9)
  • the arms (8) of the inner radial ribs (9) extend on the rear wall (3) from the curved sections (6) towards the hub (4) from outside to inside.
  • the laundry washer-dryer (1) furthermore comprises a plurality of outer radial ribs (10)
  • the laundry washer/dryer (1) comprises at least one circumferential rib
  • At least one circumferential rib (11) is composed of arc-shaped segments (12) which are inwardly concave in the radial direction.
  • the strength of the tub (5) rear wall (3) increases and bending under load decreases.
  • the rear wall (3) of the tub (5) of the laundry washer-dryer (1) of the present invention in particular the region of the rear wall (3) around the hub (4) bearing the shaft (14) is strengthened against mechanical stress.
  • the hyperbolic inner radial ribs (9) disposed around the hub (4) at the rear wall (3) transfer the tensions created by the balanced and unbalanced load in the drum (2) on the hub (4) of the tub (5) rear wall (3) to the outer radial ribs (10), the strain is homogeneously distributed along the rear wall (3) and thus the strength of the tub (5) is increased.
  • the amount of plastic raw material used and thus material costs are decreased.

Landscapes

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

Description

  • The present invention relates to a laundry washer-dryer having a tub produced from plastic material.
  • In laundry washer-dryers, washing and drying processes are realized by placing the laundry into a drum moving in the tub. The tub is produced from rigid thermoplastic material such as polyethylene or polypropylene due its high chemical resistance values and low costs. The drum makes rotational movement in the tub. The unbalanced load caused by the laundry in the drum and the forces generated during the spin-drying step of the laundry washer-dryer strain the tub. Especially the surrounding area around the hub where the shaft rotating the drum is borne in the ball bearing in the tub is subjected to mechanical loads, thus causing wear or cracking risks in time. At least the rear wall of the tub is required to be produced from materials with high mechanical strength, which increases the production costs.
  • In the Patent No. US9376767 (B2 ), a plastic tub for a washing machine is disclosed which includes a cylindrical casing, and an end face wall sealing the cylindrical casing, wherein the end face includes a bearing mount for a shaft of a laundry drum and radially-aligned reinforcing ribs molded into the end face wall. The reinforcing ribs begin at the bearing mount and branch in a Y-shape along their radial extent.
  • In the Patent Application No. US2011283746 (A1 ), a washing machine having a tub with a structurally strengthened rear wall is disclosed.
  • In the Patent Application No. EP2460924 (A2 ), a method for manufacturing a tub section for a washing machine is disclosed.
  • In the Patent Application No. DE19756516 (A1 ), a thin-walled sheet metal component of an appliance which has an embossed honeycomb surface structure is disclosed.
  • In the Patent Application No. KR20080040338 (A ), a washing machine having a tub with increased the rigidity and strength is disclosed.
  • The aim of the present invention is the realization of a laundry washer-dryer which comprises a tub with increased mechanical strength.
  • In the laundry washer-dryer according to claim 1 realized in order to attain the aim of the present invention,
    the rear wall of the tub are provided with inner radial ribs which are in the form of a hyperbolic open curve, which have a curved section and two symmetrical arms which extend symmetrically in the radial direction from the vertex of the curved section towards the tub on the inside, and which are positioned all around the hub. Outer radial ribs which are again in the form of a hyperbolic open curve and which have arms extending from inside to the outside in a direction opposite to the inner radial ribs.
  • The laundry washer-dryer realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
    • Figure 1 - is the schematic view of a laundry washer-dryer.
    • Figure 2 - is the schematic view of the rear wall of the tub.
    • Figure 3 - is the schematic view of the rib structure on the rear wall of the tub.
    • Figure 4 - is the detailed view of the rib structure on the rear wall of the tub.
    • Figure 5 - is the perspective view of the rear side of the tub.
    • Figure 6 - is the view of the tub rear wall in an embodiment of the present invention.
    • Figure 7 - is the view of the tub rear wall in another embodiment of the present invention.
  • The elements illustrated in the figures are numbered as follows:
    1. 1. Laundry washer-dryer
    2. 2. Drum
    3. 3. Rear wall
    4. 4. Hub
    5. 5. Tub
    6. 6. Curved section
    7. 7. Vertex
    8. 8. Arm
    9. 9. Inner radial rib
    10. 10. Outer radial rib
    11. 11. Circumferential rib
    12. 12. Segment
    13. 13. Motor
    14. 14. Shaft
    15. 15. Ball bearing
  • The laundry washer-dryer (1) comprises a drum (2) which is rotated around the horizontal axis by a motor (13) and wherein the laundry is placed, a shaft (14) which transmits the movement received from the motor (13) to the drum (2), and a tub (5) wherein the drum (2) moves, which is produced from plastic (rigid thermoplastic) and which has a circular front wall with the laundry loading opening arranged at the center thereof, a cylindrical side wall, a circular rear wall (3) and a hub (4) which is arranged at the rear wall (3) and where the shaft (14) is borne with the ball bearing (15).
  • The laundry washer-dryer (1) of the present invention comprises a plurality of inner radial ribs (9)
    • which are produced from plastic and integrated onto the tub (5) rear wall (3),
    • which is in the form of a hyperbolic open curve of which the hyperbolic cosine function is defined as "hyperbolic cosine function : f(x) = cosh (x)",
    • which has a curved section (6) and two symmetrical arms (8) symmetrically extending inwardly from the vertex (7) of the curved section (6) in the radial direction, and
    • which are positioned all around the hub (4) (Figure 4).
  • The concave surfaces of the curved sections (6) of the inner radial ribs (9) face the hub (4). The arms (8) of the inner radial ribs (9) extend on the rear wall (3) from the curved sections (6) towards the hub (4) from outside to inside.
  • The laundry washer-dryer (1) furthermore comprises a plurality of outer radial ribs (10)
    • which are produced from plastic and integrated onto the tub (5) rear wall (3),
    • which are in the form of a hyperbolic open curve,
    • which has the common or adjacent vertices (7) with inner radial ribs (9), the curved sections (6) positioned back to back with the curved sections (6) of the inner radial ribs (9) and two symmetrical arms (8) extending outwardly from the vertices (7) in a direction opposite to the inner radial ribs (9) and towards the outer circumference of the rear wall (3) (Figure 4).
  • In an embodiment of the present invention, the laundry washer/dryer (1) comprises at least one circumferential rib
    • which is produced from plastic and concentrically integrated onto the tub (5) rear wall (3), and
    • which has a diameter smaller than the outer diameter of the rear wall and larger than a circle formed by the vertices (7) of the inner radial ribs (9) and the outer radial ribs (10).
  • In another embodiment of the present invention, at least one circumferential rib (11) is composed of arc-shaped segments (12) which are inwardly concave in the radial direction. In the laundry washer-dryer (1) wherein the circumferential ribs (11) are composed of arc-shaped segments (12), the strength of the tub (5) rear wall (3) increases and bending under load decreases.
  • The rear wall (3) of the tub (5) of the laundry washer-dryer (1) of the present invention, in particular the region of the rear wall (3) around the hub (4) bearing the shaft (14) is strengthened against mechanical stress. The hyperbolic inner radial ribs (9) disposed around the hub (4) at the rear wall (3) transfer the tensions created by the balanced and unbalanced load in the drum (2) on the hub (4) of the tub (5) rear wall (3) to the outer radial ribs (10), the strain is homogeneously distributed along the rear wall (3) and thus the strength of the tub (5) is increased. The amount of plastic raw material used and thus material costs are decreased.

Claims (4)

  1. - A laundry washer-dryer (1) comprising a drum (2) which is rotated around a horizontal axis by a motor (13) and wherein the laundry is placed, a shaft (14) which transmits the movement received from the motor (13) to the drum (2), and a tub (5) wherein the drum (2) moves, which is produced from plastic and which has a circular rear wall (3) and a hub (4) which is arranged at the rear wall (3) and where the shaft (14) is borne with a ball bearing, and a plurality of inner radial ribs (9)
    - which are produced from plastic and integrated onto the tub (5) rear wall (3),
    - which are in the form of a hyperbolic open curve of which the hyperbolic cosine function is defined as "hyperbolic cosine function : f(x) = cosh (x)",
    - which has a curved section (6) and two symmetrical arms (8) symmetrically extending inwardly from the vertex (7) of the curved section (6) in the radial direction
    - which are positioned all around the hub (4).
  2. - A laundry washer-dryer (1) as in Claim 1, comprising a plurality of outer radial ribs (10) which are integrated onto the tub (5) rear wall (3), which are in the form of a hyperbolic open curve and which has the common or adjacent vertices (7) with inner radial ribs (9), the curved sections (6) positioned back to back with the curved sections (6) of the inner radial ribs (9) and two symmetrical arms (8) extending outwardly from the vertices (7) in a direction opposite to the inner radial ribs (9) and towards the outer circumference of the rear wall (3).
  3. - A laundry washer-dryer (1) as in Claim 1 or 2, comprising at least one circumferential rib (11) which is concentrically integrated onto the tub (5) rear wall (3) and which has a diameter smaller than the outer diameter of the rear wall and larger than a circle formed by the vertices (7) of the inner radial ribs (9) and the outer radial ribs (10).
  4. - A laundry washer-dryer (1) as in Claim 3, comprising at least one circumferential rib (11) which is composed of arc-shaped segments (12) which are inwardly concave in the radial direction.
EP19901245.1A 2018-12-18 2019-05-22 A laundry washer-dryer having a tub with improved mechanical strength Active EP3899124B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2018/19632A TR201819632A2 (en) 2018-12-18 2018-12-18 LAUNDRY WASHER-DRYER WITH BOILER WITH INCREASED MECHANICAL RESISTANCE
PCT/TR2019/050362 WO2020130966A1 (en) 2018-12-18 2019-05-22 A laundry washer-dryer having a tub with improved mechanical strength

Publications (3)

Publication Number Publication Date
EP3899124A1 EP3899124A1 (en) 2021-10-27
EP3899124A4 EP3899124A4 (en) 2022-11-09
EP3899124B1 true EP3899124B1 (en) 2023-11-08

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ID=71101507

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Application Number Title Priority Date Filing Date
EP19901245.1A Active EP3899124B1 (en) 2018-12-18 2019-05-22 A laundry washer-dryer having a tub with improved mechanical strength

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EP (1) EP3899124B1 (en)
TR (1) TR201819632A2 (en)
WO (1) WO2020130966A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230064111A1 (en) * 2021-08-30 2023-03-02 Whirlpool Corporation Structured geometry for a tub rear wall of a laundry appliance

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19756516A1 (en) 1997-12-18 1999-06-24 Bosch Siemens Hausgeraete Thin sheet metal component
US7997103B2 (en) 2002-12-10 2011-08-16 Lg Electronics Inc. Tub having structurally strengthened rear wall and washing machine with the same therein
KR20080040338A (en) 2006-11-03 2008-05-08 엘지전자 주식회사 Drum washing machine
DE502008002248D1 (en) * 2007-09-20 2011-02-17 Bsh Bosch Siemens Hausgeraete PLASTIC LEAVING CONTAINER FOR A WASHING MACHINE OR DRYER
DE102007044883A1 (en) * 2007-09-20 2009-04-09 BSH Bosch und Siemens Hausgeräte GmbH Plastic tub for a washing machine or a washer-dryer
ES2399674B1 (en) 2010-12-06 2014-03-27 BSH Electrodomésticos España S.A. Method of manufacturing a bowl section for a washing machine
US10704180B2 (en) * 2016-09-22 2020-07-07 Whirlpool Corporation Reinforcing cap for a tub rear wall of an appliance
PL3330428T3 (en) * 2016-11-30 2021-05-31 BSH Hausgeräte GmbH Tub of a clothes drying appliance

Also Published As

Publication number Publication date
EP3899124A1 (en) 2021-10-27
EP3899124A4 (en) 2022-11-09
TR201819632A2 (en) 2020-07-21
WO2020130966A1 (en) 2020-06-25

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