EP2460922A1 - Counterweight for a washing and/or drying machine and washing and/or drying machine comprising such counterweight - Google Patents
Counterweight for a washing and/or drying machine and washing and/or drying machine comprising such counterweight Download PDFInfo
- Publication number
- EP2460922A1 EP2460922A1 EP10193542A EP10193542A EP2460922A1 EP 2460922 A1 EP2460922 A1 EP 2460922A1 EP 10193542 A EP10193542 A EP 10193542A EP 10193542 A EP10193542 A EP 10193542A EP 2460922 A1 EP2460922 A1 EP 2460922A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- counterweight
- reinforcing elements
- washing
- drying machine
- composite material
- 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- Withdrawn
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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
- D06F58/00—Domestic laundry dryers
- D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
- D06F58/04—Details
Definitions
- the invention is directed to washing and/or drying systems or machines for clothes in general and relates to a counterweight for a washing and/or drying machine, wherein the counterweight is at least partly composed of a composite material and wherein reinforcing elements are embedded in the composite material.
- the invention is further directed to a washing and/or drying machine which comprises such counterweight.
- the term washing and/or drying machine refers to a machine for washing and/or for drying of laundry in a household or for industrial purposes.
- the composite material is a material consisting of two or more constituent materials.
- One of the constituent materials can be a matrix material, i.e. the material into which the reinforcing elements are embedded.
- a matrix material can be concrete, e.g. comprising cement.
- Washing and/or drying machines are generally known to be provided with counterweights serving as means for ballasting the machines in order to reduce dynamic stresses, e.g. vibrations that are imparted during the rotation of a drum containing clothes, especially, during the high-speed rotation phases of the clothes washing or drying process.
- counterweights serving as means for ballasting the machines in order to reduce dynamic stresses, e.g. vibrations that are imparted during the rotation of a drum containing clothes, especially, during the high-speed rotation phases of the clothes washing or drying process.
- the reinforcing elements may be particles or objects embedded in the composite material to reinforce the material with respect to its rigidity and mechanical strength.
- the reinforcing elements can be randomly oriented, uniformly distributed and spread over the whole counterweight body or partly in a predetermined space of the counterweight body.
- the counterweight comprises concrete as a matrix material
- the character of the reinforced concrete changes with varying concretes and, additionally, depending on the material, geometry, distribution, orientation and density of the reinforcing elements.
- the United States Patent Application Publication US 2007/0220928 A1 discloses a counterweight, connectable to a washing machine tub, comprising a hollow shell of U-shaped cross-section for containing a ballast mass made of concrete to be poured in the shell.
- the United States Patent Application Publication US 2004/0094863 A1 discloses a composite material, a cured composite material and a shaped article made of composite material to be applied, i.a. on counterweights for rotating machine parts and washing machines.
- the composite material comprises fibers for reinforcement.
- the fibers are selected from the group consisting of metal fibers including steel fibers, mineral fibers, glass fibers, high temperature fibers, carbon fibers, and organic fibers including plastic fibers.
- the fibers are chopped fibers, continuous fibers, yarns or ropes, or rovings or staple fibers, or fiber nets or webs.
- a further object of the present invention is to provide a simple and reliable counterweight, which can be produced at reduced cost.
- a further object of the present invention is to provide a washing and/or drying machine which comprises such counterweight.
- At least parts of the reinforcing elements comprise hooks.
- a major advantage of the invention is that the anchoring of the reinforcing elements is greatly improved by their hooks thus leading to increased rigidity of the counterweight material, especially, an increased flexural rigidity. Still, the reinforcement is achieved by a relatively simple feature of the reinforcing elements, which can easily be realized in the manufacturing process of the reinforcing elements.
- the hooks can be arranged with varying orientation, size and form.
- the hook can abduct from the reinforcing element perpendicular to the elongation of the reinforcing element.
- the hook may be U-shaped, have circular shape and/or any polygon shape or form.
- the location of the hooks on the reinforcing elements can vary.
- the hooks can either anchor in the matrix material of the composite material or get caught with each other.
- the hooks can either be added to the reinforcing elements or manufactured preferably as an integrated part of the reinforcing elements.
- hooks can be arranged on each of the respective reinforcing element. It is understood that different embodiments or shapes of reinforcing elements might be combined within one counterweight.
- the reinforcing elements comprise fibrous elements. Reinforcing elements with a fibrous geometry lead to a further enhanced strength and elasticity.
- the fibrous elements can be synthetic fibers and natural fibers such as glass fibers, carbon fibers, cellulose fibers, mineral fibers, and mixtures thereof.
- the length of the reinforcing elements ranges between 15 mm and 60 mm.
- Reinforcing elements of the said dimensions - i.e. relatively small in comparison to the whole counterweight body - are advantageous, especially, for counterweights with complex shape.
- counterweights with comparatively small wall thickness can be realized. If the mentioned reinforcing elements are closely spaced and uniformly distributed, for example in a concrete counterweight, the static and dynamic properties with respect to rigidity are improved substantially.
- the width of the reinforcing elements ranges between 0.5 mm and 4 mm.
- Such a width dimension, especially, in combination with the above mentioned length dimension leads to an advantageous geometry for reinforcing the counterweight material.
- the width can correlate or be equal to the diameter of the reinforcing element, e.g. when the reinforcing element shows a cylindrical form in some sections along longitudinal extension of the reinforcing element.
- the reinforcing elements are at least partly composed of metal. This increases the compression strength of the counterweight, e.g. if it is composed of concrete.
- the metal can be some type of steel being composed of iron, e.g. comprising an alloying material such as carbon.
- the length of the reinforcing element ranges between 10 and 100, particular preferably between 20 and 60 mm, and the width ranges between 0.1 and 10 mm, preferably between 0.5 and 3 mm.
- the reinforcing elements are at least partly composed of plastic material.
- the compression strength e.g. of a concrete counterweight
- the compressions strength can be regulated, for example by choosing an appropriate ratio of the amount of metal to the amount of plastic reinforcing elements.
- the weight of the counterweight can be regulated by choosing the amount of plastic reinforcing elements.
- plastic refers to a polymeric material such as polypropylene.
- the length of the reinforcing element ranges between 15 and 60 mm and the width ranges between 1 and 4 mm.
- a washing and/or drying machine advantageously comprises an oscillating assembly and the counterweight of the present invention whereby the counterweight is attached to the oscillating assembly.
- Figure 1 is a sectional view of a counterweight 1 composed of a composite material 2 comprising as a matrix material 3 concrete 4. Embedded in the composite material 2 are reinforcing elements 5 which are randomly orientated, uniformly distributed and spread over the entire body of the counterweight 1.
- the reinforcing elements 5 are fibrous elements 6 with a length 7 ranging between 15 and 60 mm and a width 8 ranging between 0.5 and 4 mm.
- Parts 20 of the reinforcing elements 5 comprise hooks 21 arranged at the ends 22 of the reinforcing elements 5 and at portions 23 along the reinforcing elements 5.
- the hooks 21 anchor in the matrix material 3 and are in several areas 24 caught with each other. Furthermore, some of the hooks 21 abduct perpendicular from the reinforcing elements 5. Some of the hooks 21 show circular form 25 or U-form 26.
- the reinforcing elements 5 are composed of metal 27 and plastic material 28.
- FIG. 2 shows a possible arrangement of a counterweight 1 attached to a tub 30 of a washing machine.
- the tub 30 is part of an oscillating assembly of the washing machine.
- elements identical or corresponding to the ones described above are indicated with the same numerals.
- the tub 30 is composed of a front portion 31 and a back portion 32.
- the front portion 31 is composed of a peripheral cylindrical band 33 joined with a front annular wall 34.
- the back portion 32 is made of a peripheral cylindrical band 35 joined with a circular bottom wall (not shown) at the end 36 of the tub 30.
- the front portion 31 is adapted to be joined with the back portion 32 by means of fixing.
- the tub 30 houses a drum 40 for laundry that is driven into rotation wherein the drum 40 rotates around the axis 41.
- the counterweight 1 is fixed on the front portion 31 of the tub 30 at its lower part 42 adapting part-wise to the cylindrical band 33 and the annular wall 34. During the rotation of the drum 40 the counterweight 1 serves as a counterbalance 43 for centrifugal forces and to avoid undesired movements of the oscillating assembly in the washing machine.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
Abstract
The invention relates to a counterweight (1) for a washing and/or drying machine, wherein the counterweight (1) is at least partly composed of a composite material (2) and wherein reinforcing elements (5) are embedded in the composite material (2). The invention relates further to a washing and/or drying machine which comprises such counterweight.
It is an object of the present invention to provide a counterweight with increased rigidity. A further object of the present invention is to provide a simple and reliable counterweight, which can be produced at reduced cost.
At least parts (20) of the reinforcing elements (5) comprise hooks (21).
Description
- The invention is directed to washing and/or drying systems or machines for clothes in general and relates to a counterweight for a washing and/or drying machine, wherein the counterweight is at least partly composed of a composite material and wherein reinforcing elements are embedded in the composite material. The invention is further directed to a washing and/or drying machine which comprises such counterweight.
- In the context of the present invention, the term washing and/or drying machine refers to a machine for washing and/or for drying of laundry in a household or for industrial purposes. The composite material is a material consisting of two or more constituent materials. One of the constituent materials can be a matrix material, i.e. the material into which the reinforcing elements are embedded. Such a matrix material can be concrete, e.g. comprising cement.
- Washing and/or drying machines are generally known to be provided with counterweights serving as means for ballasting the machines in order to reduce dynamic stresses, e.g. vibrations that are imparted during the rotation of a drum containing clothes, especially, during the high-speed rotation phases of the clothes washing or drying process.
- The reinforcing elements may be particles or objects embedded in the composite material to reinforce the material with respect to its rigidity and mechanical strength. The reinforcing elements can be randomly oriented, uniformly distributed and spread over the whole counterweight body or partly in a predetermined space of the counterweight body. Especially, if the counterweight comprises concrete as a matrix material, the character of the reinforced concrete changes with varying concretes and, additionally, depending on the material, geometry, distribution, orientation and density of the reinforcing elements.
- The United States Patent Application Publication
US 2007/0220928 A1 discloses a counterweight, connectable to a washing machine tub, comprising a hollow shell of U-shaped cross-section for containing a ballast mass made of concrete to be poured in the shell. - The United States Patent Application Publication
US 2004/0094863 A1 discloses a composite material, a cured composite material and a shaped article made of composite material to be applied, i.a. on counterweights for rotating machine parts and washing machines. The composite material comprises fibers for reinforcement. The fibers are selected from the group consisting of metal fibers including steel fibers, mineral fibers, glass fibers, high temperature fibers, carbon fibers, and organic fibers including plastic fibers. The fibers are chopped fibers, continuous fibers, yarns or ropes, or rovings or staple fibers, or fiber nets or webs. - It is an object of the present invention to provide a counterweight with increased rigidity and mechanical strength. A further object of the present invention is to provide a simple and reliable counterweight, which can be produced at reduced cost. A further object of the present invention is to provide a washing and/or drying machine which comprises such counterweight.
- These objects are achieved by a counterweight with the features of
claim 1 and ofclaim 8 respectivly. - Accordingly, at least parts of the reinforcing elements comprise hooks.
- A major advantage of the invention is that the anchoring of the reinforcing elements is greatly improved by their hooks thus leading to increased rigidity of the counterweight material, especially, an increased flexural rigidity. Still, the reinforcement is achieved by a relatively simple feature of the reinforcing elements, which can easily be realized in the manufacturing process of the reinforcing elements.
- The hooks can be arranged with varying orientation, size and form. For example, the hook can abduct from the reinforcing element perpendicular to the elongation of the reinforcing element. Furthermore, the hook may be U-shaped, have circular shape and/or any polygon shape or form. Moreover, the location of the hooks on the reinforcing elements can vary. The hooks can either anchor in the matrix material of the composite material or get caught with each other.
- In the manufacturing process, the hooks can either be added to the reinforcing elements or manufactured preferably as an integrated part of the reinforcing elements.
- Further details, aspects and advantages of the invention are subject of the dependent claims, the drawings and their description.
- In a preferred embodiment of the present invention hooks can be arranged on each of the respective reinforcing element. It is understood that different embodiments or shapes of reinforcing elements might be combined within one counterweight.
- In another preferred embodiment of the present invention, the reinforcing elements comprise fibrous elements. Reinforcing elements with a fibrous geometry lead to a further enhanced strength and elasticity.
- The fibrous elements can be synthetic fibers and natural fibers such as glass fibers, carbon fibers, cellulose fibers, mineral fibers, and mixtures thereof.
- According to another preferred embodiment of the invention, the length of the reinforcing elements ranges between 15 mm and 60 mm. Reinforcing elements of the said dimensions - i.e. relatively small in comparison to the whole counterweight body - are advantageous, especially, for counterweights with complex shape. Using reinforcing elements with the aforementioned dimension, counterweights with comparatively small wall thickness can be realized. If the mentioned reinforcing elements are closely spaced and uniformly distributed, for example in a concrete counterweight, the static and dynamic properties with respect to rigidity are improved substantially.
- According to another advantageous embodiment of the invention, the width of the reinforcing elements ranges between 0.5 mm and 4 mm. Such a width dimension, especially, in combination with the above mentioned length dimension leads to an advantageous geometry for reinforcing the counterweight material.
- The width can correlate or be equal to the diameter of the reinforcing element, e.g. when the reinforcing element shows a cylindrical form in some sections along longitudinal extension of the reinforcing element.
- In a further advantageous embodiment of the invention, the reinforcing elements are at least partly composed of metal. This increases the compression strength of the counterweight, e.g. if it is composed of concrete. In a practical realization of metal reinforcing elements, the metal can be some type of steel being composed of iron, e.g. comprising an alloying material such as carbon. In a possible design of a reinforcing element made of metal, the length of the reinforcing element ranges between 10 and 100, particular preferably between 20 and 60 mm, and the width ranges between 0.1 and 10 mm, preferably between 0.5 and 3 mm.
- In an advantageous embodiment of the present invention, the reinforcing elements are at least partly composed of plastic material. By the use of plastic reinforcing elements, the compression strength, e.g. of a concrete counterweight, can be decreased. When using both metal and plastic reinforcing elements, the compressions strength can be regulated, for example by choosing an appropriate ratio of the amount of metal to the amount of plastic reinforcing elements. Additionally, the weight of the counterweight can be regulated by choosing the amount of plastic reinforcing elements.
- In the context of the present invention, the term plastic refers to a polymeric material such as polypropylene. In a functional design of a reinforcing element made of plastic material, the length of the reinforcing element ranges between 15 and 60 mm and the width ranges between 1 and 4 mm.
- A washing and/or drying machine advantageously comprises an oscillating assembly and the counterweight of the present invention whereby the counterweight is attached to the oscillating assembly.
- The foregoing and further objects, features and advantages of the present invention will become apparent from the following description of embodiments by way of a non-limiting example with reference to the accompanying drawings, in which:
- Figure 1
- is a sectional view of an embodiment of the claimed counterweight,
- Figure 2
- is a possible arrangement of the counterweight on a washing and/or drying tub.
-
Figure 1 is a sectional view of acounterweight 1 composed of acomposite material 2 comprising as amatrix material 3concrete 4. Embedded in thecomposite material 2 are reinforcingelements 5 which are randomly orientated, uniformly distributed and spread over the entire body of thecounterweight 1. The reinforcingelements 5 arefibrous elements 6 with alength 7 ranging between 15 and 60 mm and awidth 8 ranging between 0.5 and 4 mm. -
Parts 20 of the reinforcingelements 5 comprisehooks 21 arranged at theends 22 of the reinforcingelements 5 and atportions 23 along the reinforcingelements 5. Thehooks 21 anchor in thematrix material 3 and are inseveral areas 24 caught with each other. Furthermore, some of thehooks 21 abduct perpendicular from the reinforcingelements 5. Some of thehooks 21 showcircular form 25 orU-form 26. The reinforcingelements 5 are composed ofmetal 27 andplastic material 28. -
Figure 2 shows a possible arrangement of acounterweight 1 attached to atub 30 of a washing machine. Thetub 30 is part of an oscillating assembly of the washing machine. In the following description, elements identical or corresponding to the ones described above are indicated with the same numerals. Thetub 30 is composed of afront portion 31 and aback portion 32. Thefront portion 31 is composed of a peripheralcylindrical band 33 joined with a frontannular wall 34. Theback portion 32 is made of a peripheralcylindrical band 35 joined with a circular bottom wall (not shown) at theend 36 of thetub 30. Thefront portion 31 is adapted to be joined with theback portion 32 by means of fixing. Thetub 30 houses a drum 40 for laundry that is driven into rotation wherein the drum 40 rotates around theaxis 41. - The
counterweight 1 is fixed on thefront portion 31 of thetub 30 at itslower part 42 adapting part-wise to thecylindrical band 33 and theannular wall 34. During the rotation of the drum 40 thecounterweight 1 serves as a counterbalance 43 for centrifugal forces and to avoid undesired movements of the oscillating assembly in the washing machine. -
- 1
- counterweight
- 2
- composite material
- 3
- matrix material
- 4
- concrete
- 5
- reinforcing elements
- 6
- fibrous elements
- 7
- length
- 8
- width
- 20
- parts
- 21
- hooks
- 22
- ends
- 23
- portions
- 24
- areas
- 25
- circular form
- 26
- U-form
- 27
- metal
- 28
- plastic material
- 30
- tub
- 31
- front portion
- 32
- back portion
- 33
- cylindrical band
- 34
- annular wall
- 35
- cylindrical band
- 36
- end
- 40
- drum
- 41
- axis
- 42
- lower part
- 43
- counterbalance
Claims (8)
- Counterweight (1) for a washing and/or drying machine,- wherein the counterweight (1) is at least partly composed of a composite material (2) and- wherein reinforcing elements (5) are embedded in the composite material (2),characterized in that- at least parts (20) of the reinforcing elements (5) comprise hooks (21).
- Counterweight of claim 1,
characterized in that- at least some reinforcing elements (5) comprised hooks (21) which are arranged at the ends of the reinforcing elements (5). - Counterweight of claim 1 or 2,
characterized in that- the reinforcing elements (5) comprise fibrous elements (6). - Counterweight of claim 1, 2 or 3,
characterized in that- the length (7) of the reinforcing elements (5) ranges between 15 mm and 60 mm. - Counterweight of at least one of the preceding claims,
characterized in that- the width (8) of the reinforcing elements (5) ranges between 0.5 mm and 4 mm. - Counterweight of at least one of the preceding claims,
characterized in that- the reinforcing elements (5) are at least partly composed of metal (27). - Counterweight of at least one of the preceding claims,
characterized in that- the reinforcing elements (5) are at least partly composed of plastic material (28). - Washing and/or drying machine comprising an oscillating assembly and a counterweight (1) which is attached to the oscillating assembly,- wherein the counterweight (1) is at least partly composed of a composite material (2) and- wherein reinforcing elements (5) are embedded in the composite material (2),characterized in that- at least parts (20) of the reinforcing elements (5) comprise hooks (21).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10193542A EP2460922A1 (en) | 2010-12-02 | 2010-12-02 | Counterweight for a washing and/or drying machine and washing and/or drying machine comprising such counterweight |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10193542A EP2460922A1 (en) | 2010-12-02 | 2010-12-02 | Counterweight for a washing and/or drying machine and washing and/or drying machine comprising such counterweight |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2460922A1 true EP2460922A1 (en) | 2012-06-06 |
Family
ID=43970894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10193542A Withdrawn EP2460922A1 (en) | 2010-12-02 | 2010-12-02 | Counterweight for a washing and/or drying machine and washing and/or drying machine comprising such counterweight |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2460922A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020256652A1 (en) * | 2019-06-18 | 2020-12-24 | Tulga Simsek | Washing machine mechanical balance system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0152490A1 (en) * | 1983-11-08 | 1985-08-28 | Jose Manuel Restrepo | Improved fibre-reinforced cement and process |
US20040094863A1 (en) | 2001-03-01 | 2004-05-20 | Buerge Theodor A. | Composite material and shaped article with thermal conductivity and specific gravity on demand |
EP1780326A1 (en) * | 2005-10-26 | 2007-05-02 | Gianfranco Piazzoli | A reinforcement for a counterweight for electrical household appliances, a counterweight incorporating said reinforcement and corresponding method of production. |
US20070220928A1 (en) | 2003-12-05 | 2007-09-27 | Electrolux Home Products Corporation N.V. | Counterweight for Washing Machine Tube |
WO2008128021A2 (en) * | 2007-04-13 | 2008-10-23 | Innotec | Composite counterweight and method of making same |
-
2010
- 2010-12-02 EP EP10193542A patent/EP2460922A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0152490A1 (en) * | 1983-11-08 | 1985-08-28 | Jose Manuel Restrepo | Improved fibre-reinforced cement and process |
US20040094863A1 (en) | 2001-03-01 | 2004-05-20 | Buerge Theodor A. | Composite material and shaped article with thermal conductivity and specific gravity on demand |
US20070220928A1 (en) | 2003-12-05 | 2007-09-27 | Electrolux Home Products Corporation N.V. | Counterweight for Washing Machine Tube |
EP1780326A1 (en) * | 2005-10-26 | 2007-05-02 | Gianfranco Piazzoli | A reinforcement for a counterweight for electrical household appliances, a counterweight incorporating said reinforcement and corresponding method of production. |
WO2008128021A2 (en) * | 2007-04-13 | 2008-10-23 | Innotec | Composite counterweight and method of making same |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020256652A1 (en) * | 2019-06-18 | 2020-12-24 | Tulga Simsek | Washing machine mechanical balance system |
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