EP1925704A1 - Drum for a washing machine and washing machine provided with such drum - Google Patents

Drum for a washing machine and washing machine provided with such drum Download PDF

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Publication number
EP1925704A1
EP1925704A1 EP06124786A EP06124786A EP1925704A1 EP 1925704 A1 EP1925704 A1 EP 1925704A1 EP 06124786 A EP06124786 A EP 06124786A EP 06124786 A EP06124786 A EP 06124786A EP 1925704 A1 EP1925704 A1 EP 1925704A1
Authority
EP
European Patent Office
Prior art keywords
drum
bulges
washing machine
perforations
bulge
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.)
Granted
Application number
EP06124786A
Other languages
German (de)
French (fr)
Other versions
EP1925704B1 (en
Inventor
Bernd Luettge
Dieter Grimm
Stefanie Oberkirsch
Kraus Hartmut
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.)
Whirlpool Corp
Original Assignee
Whirlpool Corp
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=37891621&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1925704(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to EP20060124786 priority Critical patent/EP1925704B1/en
Priority to ES06124786T priority patent/ES2362002T3/en
Priority to DE200660020594 priority patent/DE602006020594D1/en
Publication of EP1925704A1 publication Critical patent/EP1925704A1/en
Application granted granted Critical
Publication of EP1925704B1 publication Critical patent/EP1925704B1/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
    • D06F37/02—Rotary receptacles, e.g. drums

Definitions

  • the present invention relates to a drum adapted to be rotatably mounted in a washing machine or washer-dryer, said drum having a cylindrical wall provided with perforations and with a plurality of bulges.
  • a drum of this kind is shown in EP-A-1028189 in which the bulges or raised sections are oriented towards the interior of the drum.
  • the perforations or openings are provided in indentations between the bulges.
  • DE-A-4437986 discloses a method to form a cylindrical structure with bulges in form of different polygons. Bulges having a square pattern are disclosed, but no detail is given as far as the perforations and bulge shape are concerned.
  • EP-A-935687 discloses a drum for washing machines in which bulges are still oriented towards the interior of the drum, and in which perforations are provided on the edge contours of the bulges.
  • An object of the present invention is to provide a drum of the type mentioned above which increases the gentleness of laundry treatment in high spin speed drums and in which the stiffness of the drum basket is increased.
  • One of the main features of the present invention is to provide bulges which are oriented towards the exterior of the drum and in which the perforations are centred within the bulges.
  • each bulge is punched like a frustum of pyramid from the inside of the drum, and each perforation or hole is in the centre of each punch.
  • the pyramid-shape bulges are arranged in a rows/columns matrix, in which the position of a column of bulges to the next column of adjacent bulges is offset of 1/3 of the distance between two adjacent rows, which is also the pitch between bulges.
  • a particular advantage of the drum according to the invention is the possibility to change the distance of one row of pyramid-shaped bulges to the next one without reducing distance of punched areas. Flat space between bulges will not increase by changing offset. Moerover, changing the offset will not change the shape of the bulges.
  • the bulges are shaped in order to avoid substantially flat area between bulges so that water drops will be immediately on an inclined/deformed surface and then driven towards perforations due to the centrifugal force and funnel-shaped bulges.
  • Another important advantage of the present invention is the increase of drum stiffness in bending, which is around 25% if compared to known drums of washing machines.
  • a drum 10 of a washing machine comprises a cylindrical metal wall 12 closed at one end by a substantially flat rear wall (not shown) and presenting, on its other end, an opening 14 for loading/unloading laundry (the opening 14 being aligned with a door - not shown - of the washing machine).
  • the drum shown in figure 1 is for the mounting thereof in the tub of a front loading washing machine, nevertheless the drum can have two opposite end walls and it can be used in a top loading washer as well (in this latter a closable opening for loading/unloading laundry being provided in the cylindrical wall of the drum).
  • the wall 12 of the drum 10 is provided with a plurality of bulges 16 arranged in a sort of row-column matrix as shown in figures 1 and 2.
  • the columns of the matrix, indicated with reference Y, are all parallel among them and to the rotational axis of the drum 10 as well, indicated with reference R.
  • each column Y is offset 1/3 of the pitch P between each bulge 16.
  • Such offset is indicated with reference K in figure 2. Due to this offset K of adjacent columns of the matrix, it is not possible to identify parallel rows of the matrix, rather “irregular" rows of the matrix of bulges.
  • the applicant has tested this arrangement with others and it has been considered as the preferred one in term either of drum stiffness or gentle treatment of laundry during washing. Nevertheless also a regular matrix pattern of the bulges, or an offset K of different value (for instance a 1 ⁇ 2 offset) offers many technical advantages compared to the prior art and has to be considered within the scope of the present invention.
  • Each bulge has a square base and has a centred perforation or hole 18 for the passage of water during the washing/drying process.
  • the distance between adjacent bulges is chosen in order to reduce or avoid any flat surface of the drum therebetween.
  • the holes 18 are obtained by punching the metal sheet of the wall 12 and the direction of punching is from the inside of the drum 10 to the outside thereof, in order to avoid burrs.
  • each bulge 16 is shown in figures 3 and 4. Since the shape is substantially a frustum of pyramid, at least two different regions can be identified: a first region defined by inclined flat walls 16a radiused by corner zones 16b and a second region defined by a bottom flat wall 16c (top of the frustum of pyramid) in which the corresponding hole 18 is centrally located.
  • the above described shape of the bulges 16, together with the hole design, has given a surprising increase of the drum stiffness, particularly with reference to shear and bending.
  • the new design is particularly advantageous in term of its bending stiffness, which is the most important mechanical features when the drum rotates at high speeds, as in the modern high spin speed washers.

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

Abstract

A drum adapted to be rotatably mounted in a tub of a washing machine or washer dryer presents a cylindrical wall provided with perforations and with a plurality of bulges (16). Such bulges are oriented towards the exterior of the drum and are shaped as frustum of pyramid. The perforations of the drum are centred within the bulges.

Description

  • The present invention relates to a drum adapted to be rotatably mounted in a washing machine or washer-dryer, said drum having a cylindrical wall provided with perforations and with a plurality of bulges.
  • A drum of this kind is shown in EP-A-1028189 in which the bulges or raised sections are oriented towards the interior of the drum. In this known solution the perforations or openings are provided in indentations between the bulges.
  • DE-A-4437986 discloses a method to form a cylindrical structure with bulges in form of different polygons. Bulges having a square pattern are disclosed, but no detail is given as far as the perforations and bulge shape are concerned.
  • EP-A-935687 discloses a drum for washing machines in which bulges are still oriented towards the interior of the drum, and in which perforations are provided on the edge contours of the bulges.
  • The above known solutions do not offer a good combination of a stiff drum and gentle treatment of laundry.
  • An object of the present invention is to provide a drum of the type mentioned above which increases the gentleness of laundry treatment in high spin speed drums and in which the stiffness of the drum basket is increased.
  • The above object is obtained by a drum claimed in the appended claims.
  • One of the main features of the present invention is to provide bulges which are oriented towards the exterior of the drum and in which the perforations are centred within the bulges.
  • According to a preferred feature of the invention, each bulge is punched like a frustum of pyramid from the inside of the drum, and each perforation or hole is in the centre of each punch.
  • According to another preferred feature of the invention, the pyramid-shape bulges are arranged in a rows/columns matrix, in which the position of a column of bulges to the next column of adjacent bulges is offset of 1/3 of the distance between two adjacent rows, which is also the pitch between bulges.
  • A particular advantage of the drum according to the invention is the possibility to change the distance of one row of pyramid-shaped bulges to the next one without reducing distance of punched areas. Flat space between bulges will not increase by changing offset. Moerover, changing the offset will not change the shape of the bulges.
  • Preferably the bulges are shaped in order to avoid substantially flat area between bulges so that water drops will be immediately on an inclined/deformed surface and then driven towards perforations due to the centrifugal force and funnel-shaped bulges.
  • Another important advantage of the present invention is the increase of drum stiffness in bending, which is around 25% if compared to known drums of washing machines.
  • Other advantages and features of the present invention will be clear from the following detailed description, provided purely as an example of the invention, with reference to the attached drawings in which:
    • Figure 1 is a schematic perspective view of a drum according to the invention adapted to be used in a washing machine;
    • Figure 2 is an enlarged view of a detail of the drum shown in figure 1;
    • Figure 3 is a detail of figure 2, showing a plan view of a single bulge of the drum; and
    • Figure 4 is a cross section along line IV-IV of figure 3.
  • With reference to the drawings, a drum 10 of a washing machine comprises a cylindrical metal wall 12 closed at one end by a substantially flat rear wall (not shown) and presenting, on its other end, an opening 14 for loading/unloading laundry (the opening 14 being aligned with a door - not shown - of the washing machine). Even if the drum shown in figure 1 is for the mounting thereof in the tub of a front loading washing machine, nevertheless the drum can have two opposite end walls and it can be used in a top loading washer as well (in this latter a closable opening for loading/unloading laundry being provided in the cylindrical wall of the drum).
  • The wall 12 of the drum 10 is provided with a plurality of bulges 16 arranged in a sort of row-column matrix as shown in figures 1 and 2. The columns of the matrix, indicated with reference Y, are all parallel among them and to the rotational axis of the drum 10 as well, indicated with reference R. In the shown example, each column Y is offset 1/3 of the pitch P between each bulge 16. Such offset is indicated with reference K in figure 2. Due to this offset K of adjacent columns of the matrix, it is not possible to identify parallel rows of the matrix, rather "irregular" rows of the matrix of bulges. The applicant has tested this arrangement with others and it has been considered as the preferred one in term either of drum stiffness or gentle treatment of laundry during washing. Nevertheless also a regular matrix pattern of the bulges, or an offset K of different value (for instance a ½ offset) offers many technical advantages compared to the prior art and has to be considered within the scope of the present invention.
  • Each bulge has a square base and has a centred perforation or hole 18 for the passage of water during the washing/drying process. The distance between adjacent bulges is chosen in order to reduce or avoid any flat surface of the drum therebetween. The holes 18 are obtained by punching the metal sheet of the wall 12 and the direction of punching is from the inside of the drum 10 to the outside thereof, in order to avoid burrs.
  • The peculiar shape of each bulge 16 is shown in figures 3 and 4. Since the shape is substantially a frustum of pyramid, at least two different regions can be identified: a first region defined by inclined flat walls 16a radiused by corner zones 16b and a second region defined by a bottom flat wall 16c (top of the frustum of pyramid) in which the corresponding hole 18 is centrally located.
  • The above described shape of the bulges 16, together with the hole design, has given a surprising increase of the drum stiffness, particularly with reference to shear and bending. The new design is particularly advantageous in term of its bending stiffness, which is the most important mechanical features when the drum rotates at high speeds, as in the modern high spin speed washers.

Claims (7)

  1. Drum (10) adapted to be rotatably mounted in a tub of a washing machine or washer dryer, said drum (10) having a cylindrical wall (12) provided with perforations (18) and with a plurality of bulges (16), characterised in that said bulges (16) are oriented towards the exterior of the drum and in that the perforations (18) are substantially centred within the bulges (16).
  2. Drum according to claim 1, characterised in that each bulge (16) has a pyramid shape with a square base.
  3. Drum according to claim 2, characterised in that each bulge (16) is shaped as a frustum of pyramid.
  4. Drum according to any of the preceding claims, characterised in that the bulges (16) are arranged in a sort of rows-column matrix in which the columns (Y) are parallel to the axis (R) of the drum (10) and they are offset of a predetermined pitch fraction with reference to adjacent columns (Y).
  5. Drum according to claim 4, characterised in that the offset (K) is 1/3 of the pitch (P).
  6. Drum according to any of claims 3-5, characterised in that each bulge (16) has inclined flat walls (16a) radiused by corner zones (16b).
  7. Washing machine or washer dryer characterised in that it comprises a drum (10) according to any of the preceding claims.
EP20060124786 2006-11-24 2006-11-24 Drum for a washing machine and washing machine provided with such drum Active EP1925704B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20060124786 EP1925704B1 (en) 2006-11-24 2006-11-24 Drum for a washing machine and washing machine provided with such drum
ES06124786T ES2362002T3 (en) 2006-11-24 2006-11-24 DRUM FOR A WASHING MACHINE AND WASHING MACHINE PROVIDED WITH SUCH DRUM.
DE200660020594 DE602006020594D1 (en) 2006-11-24 2006-11-24 Washing machine drum and washing machine with such a drum.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060124786 EP1925704B1 (en) 2006-11-24 2006-11-24 Drum for a washing machine and washing machine provided with such drum

Publications (2)

Publication Number Publication Date
EP1925704A1 true EP1925704A1 (en) 2008-05-28
EP1925704B1 EP1925704B1 (en) 2011-03-09

Family

ID=37891621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060124786 Active EP1925704B1 (en) 2006-11-24 2006-11-24 Drum for a washing machine and washing machine provided with such drum

Country Status (3)

Country Link
EP (1) EP1925704B1 (en)
DE (1) DE602006020594D1 (en)
ES (1) ES2362002T3 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1964960A2 (en) 2007-02-28 2008-09-03 Samsung Electronics Co., Ltd. Washing machine improving washing efficiency
CN101845739A (en) * 2009-03-23 2010-09-29 海尔集团公司 Inner drum of washing machine with high-efficient washing and dehydration structure
GB2473224A (en) * 2009-09-03 2011-03-09 John Vincent Flanagan Detergent-less washing machine
CZ302335B6 (en) * 2010-05-03 2011-03-16 Primus Ce S.R.O. Washing machine drum
EP2372010A1 (en) * 2010-04-01 2011-10-05 Electrolux Home Products Corporation N.V. Rotatable drum for laundry washing machines and assembly method of the rotatable drum
EP2455531A1 (en) * 2010-11-23 2012-05-23 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. A drum surface for washing machines
EP2628839A1 (en) * 2012-02-18 2013-08-21 Samsung Electronics Co., Ltd Washing machine
CN104420124A (en) * 2013-08-29 2015-03-18 海尔集团公司 Washer inner bucket and washer
CN105063962A (en) * 2015-08-05 2015-11-18 合肥美的洗衣机有限公司 Washing machine
CN105220404A (en) * 2014-06-20 2016-01-06 无锡小天鹅股份有限公司 Washing machine and inner core thereof
US20180355538A1 (en) * 2017-06-08 2018-12-13 Lg Electronics Inc. Drum of washing machine
EP3715522A1 (en) * 2019-03-26 2020-09-30 Electrolux Appliances Aktiebolag Washing drum for a laundry washing machine and laundry washing machine equipped with such drum
WO2023009096A1 (en) * 2021-07-29 2023-02-02 Vestel Beyaz Esya Sanayi Ve Ticaret Anonim Sirketi A drum for household appliances

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10036113B2 (en) 2013-07-22 2018-07-31 Whirlpool Corporation Laundry treating appliance with embossed container
USD761501S1 (en) 2013-09-27 2016-07-12 Whirlpool Corporation Container for clothes washing machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006836A (en) * 1977-09-26 1979-05-10 Fisher & Paykel Spin Drying Clothes Washing Machine
DE29705226U1 (en) 1997-03-22 1998-07-23 AEG Hausgeräte GmbH, 90429 Nürnberg Washing drum for a washing machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006836A (en) * 1977-09-26 1979-05-10 Fisher & Paykel Spin Drying Clothes Washing Machine
DE29705226U1 (en) 1997-03-22 1998-07-23 AEG Hausgeräte GmbH, 90429 Nürnberg Washing drum for a washing machine

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8438883B2 (en) 2007-02-28 2013-05-14 Samsung Electronics Co., Ltd. Washing machine improving washing efficiency
EP1964960A2 (en) 2007-02-28 2008-09-03 Samsung Electronics Co., Ltd. Washing machine improving washing efficiency
US8266931B2 (en) 2007-02-28 2012-09-18 Samsung Electronics Co., Ltd. Washing machine improving washing efficiency
EP1964960B1 (en) * 2007-02-28 2016-06-08 Samsung Electronics Co., Ltd. Washing machine improving washing efficiency
CN101845739A (en) * 2009-03-23 2010-09-29 海尔集团公司 Inner drum of washing machine with high-efficient washing and dehydration structure
CN101845739B (en) * 2009-03-23 2013-08-07 海尔集团公司 Inner drum of washing machine with high-efficient washing and dehydration structure
GB2473224A (en) * 2009-09-03 2011-03-09 John Vincent Flanagan Detergent-less washing machine
EP2372010A1 (en) * 2010-04-01 2011-10-05 Electrolux Home Products Corporation N.V. Rotatable drum for laundry washing machines and assembly method of the rotatable drum
WO2011121014A1 (en) * 2010-04-01 2011-10-06 Electrolux Home Products Corporation N.V. Rotatable drum for laundry washing machines and assembly method of the rotatable drum
CN102884238A (en) * 2010-04-01 2013-01-16 伊莱克斯家用产品股份有限公司 Rotatable drum for laundry washing machines and assembly method of the rotatable drum
AU2011234515B2 (en) * 2010-04-01 2015-03-26 Electrolux Home Products Corporation N.V. Rotatable drum for laundry washing machines and assembly method of the rotatable drum
CN102884238B (en) * 2010-04-01 2016-08-03 伊莱克斯家用产品股份有限公司 Rotatable drum and the assemble method of rotatable drum for washing machine
CZ302335B6 (en) * 2010-05-03 2011-03-16 Primus Ce S.R.O. Washing machine drum
EP2455531A1 (en) * 2010-11-23 2012-05-23 Vestel Beyaz Esya Sanayi Ve Ticaret A.S. A drum surface for washing machines
EP2628839A1 (en) * 2012-02-18 2013-08-21 Samsung Electronics Co., Ltd Washing machine
CN104420124A (en) * 2013-08-29 2015-03-18 海尔集团公司 Washer inner bucket and washer
US20160215431A1 (en) * 2013-08-29 2016-07-28 Haier Group Corporation Washing machine inner drum and washing machine having same
CN104420124B (en) * 2013-08-29 2018-05-22 青岛海尔滚筒洗衣机有限公司 A kind of washing machine inner tub and washing machine
CN105220404A (en) * 2014-06-20 2016-01-06 无锡小天鹅股份有限公司 Washing machine and inner core thereof
CN105063962A (en) * 2015-08-05 2015-11-18 合肥美的洗衣机有限公司 Washing machine
CN105063962B (en) * 2015-08-05 2018-09-18 合肥美的洗衣机有限公司 Washing machine
US20180355538A1 (en) * 2017-06-08 2018-12-13 Lg Electronics Inc. Drum of washing machine
US11519119B2 (en) * 2017-06-08 2022-12-06 Lg Electronics Inc. Drum of washing machine
EP3715522A1 (en) * 2019-03-26 2020-09-30 Electrolux Appliances Aktiebolag Washing drum for a laundry washing machine and laundry washing machine equipped with such drum
WO2023009096A1 (en) * 2021-07-29 2023-02-02 Vestel Beyaz Esya Sanayi Ve Ticaret Anonim Sirketi A drum for household appliances

Also Published As

Publication number Publication date
DE602006020594D1 (en) 2011-04-21
ES2362002T3 (en) 2011-06-27
EP1925704B1 (en) 2011-03-09

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