EP0097483B1 - Wash tubs - Google Patents
Wash tubs Download PDFInfo
- Publication number
- EP0097483B1 EP0097483B1 EP19830303432 EP83303432A EP0097483B1 EP 0097483 B1 EP0097483 B1 EP 0097483B1 EP 19830303432 EP19830303432 EP 19830303432 EP 83303432 A EP83303432 A EP 83303432A EP 0097483 B1 EP0097483 B1 EP 0097483B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wash tub
- sectors
- thickness
- tub according
- back plate
- 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
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Images
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
- D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
- D06F37/262—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements made of plastic material, e.g. by injection moulding
-
- 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
- D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
- D06F37/263—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements assembled from at least two elements connected to each other; Connecting or sealing means 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
- D06F37/26—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
- 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 invention relates to wash tubs suitable for use in domestic front loading washing machines for laundering clothes, and in particular to wash tubs moulded, at least in part, from plastics materials.
- Washing machines of this kind are provided with a wash tub within which is mounted a rotatable drum for holding the clothes to be washed.
- the wash tubs are usually substantially cylindrical in shape with a back plate closing one end of the tub and a water-retaining flange at the other end of the tub, the tubs also having various lugs or brackets for mounting them in an outer casing.
- the drum of a front loading machine is mounted solely on a bearing located at the centre of the back plate of the tub, and this may be subjected to strong mechanical stresses, especially during spin drying of an out-of-balance washing load. Any small flexing which occurs in the back plate is magnified at the open end of the drum, so that small clearances there may be lost, usually with catastrophic results.
- the preferred shape which has been developed is that often referred to as a "Greek Fan" and comprises a plurality of sectors, typically between twelve and eighteen in number. The inner end of each sector adjacent the bearing for the drum is displaced axially of the tub with respect to the adjacent sectors. There is usually little or no relative axial displacement at the outer ends of the adjacent sectors. Adjacent sectors are interconnected along their radial edges by axially extending webs; thus an annular section of the back plate at part radius has a castellated configuration.
- the present invention provides a wash tub for a front loading machine in which the back plate has a Greek Fan configuration comprising a plurality of sectors adjacent ones of which are relatively displaced axially of the tub and are joined along their radial edges by axially extending webs, the back plates being moulded from a plastics composition which is free from foaming agents
- a preferred wash tub is one having a tubular shell which is integrally moulded with the back plate from the same plastics composition which is free from foaming agent.
- the tubular shell preferably has a slight taper, e.g. about 4°, to assist in its removal from the moulding tool. It can also have a stepped radius, strengthening ribs and mounting lugs.
- the strength of a solid moulding is more predictable than that of a foamed moulding which has to be over- engineered to some extent to ensure adequate strength.
- a further requirement which is satisfied by the invention is that the back plate must not only be stiff, but it must have sufficient strength to withstand the repeated substantial loadings around the drum-supporting bearing without fracture. It has been found that when using a foaming composition, it was unfortunately in these most highly stressed areas where most foaming occurs during moulding. Moreover, the very presence of foaming agent necessitates longer cycle times to prevent post moulding blowing, with a result that for this particular shape, any saving in material cost which might have been achieved by foaming would be small, and the additional production costs can be a greater effect. Indeed, this can be exacerbated when demand for a high production rate can only be met on the longer foaming cycles by using additional moulding tools.
- the thickness of the sectors is greater than the thickness of their interconnecting webs.
- the thickness of the sectors is between 5 mm and 6 mm.
- the thickness ratio of web to sector lies preferably within the range 0.75 to 0.9, especially about 0.8.
- the thickness of the cylindrical shell portion of the wash tub is less than the thickness of the sectors and is, for example, the same as the thickness of the axially extending webs.
- the sectors of the back plates are preferably all orientated with their planes at an angle of less than 90° to the axis of rotation of the drum and all slope in the same direction This is in contrast to known Greek Fan back plates the planes of whose sectors slope in opposite directions.
- the angle of orientation of alternate sectors is preferably less than that of the other sectors therebetween by an amount within the range of 5 to 25°, such that the outer ends of ajacent sectors are closer together than the inner ends of adjacent sectors.
- rigidity may be improved by providing part way along the radius of the sectors an annularweb joining together the axially extending webs, the annular web being coaxial with the axis of drum rotation.
- the annular web is most suitably at a radius of between one quarter and one half, preferably about one third, the radius of the back plate, and the axial length of the web is preferably equal to the axial length of the interconnecting webs at the same radius.
- Preferred plastics compositions are fiber reinforced thermoplastics materials, especially glass filled polypropylene containing at least 20% by eight of glass fibres.
- the back plate 1 shown in the drawings has a Greek Fan configuration comprising a plurality of sectors 2, 3 displaced from each other along the axis A-A of the wash tub those marked 2 in Figure 1 being closer to the viewer than those marked 3.
- Adjacent sectors 2 and 3 are interconnected along their radial edges by axially extending webs 4, as shown in the section of Figure 2.
- the thickness 'X' of the sectors 2, 3 is greater than the thickness 'Y' of the webs 4.
- the planes of the sectors 2 and 3 slope at angles 'a' and 'b', both less than 90°, with respect to the axis A-A and they all slope in the same direction, i.e. towards the open mouth of the wash tub.
- the difference between the angles 'a' and 'b' is in the range 5 to 25°.
- a flange 5 which is joined to all the sectors 2 and 3 and their interconnecting webs 4, and is provided for bolting the back plate to a separately formed tubular shell (not shown).
- the inner ends of the sectors 2 and 3 are joined to a hub 6 for housing a drum-supporting bearing (not shown), adjacent sectors being connected to opposite ends of the hub, as shown in Figure 3.
- annular web 7, At about one third of the back plate radius, is an annular web 7, which is joined to each of the webs 4.
- a back plate substantially as illustrated was injection moulded from a polypropylene composition containing 30% by weight of glass fibre, and in the absence of any blowing agent it emerged as a single integral moulding of solid plastics composition.
- the diameter of the back plate was 470 mm., plus a 35 mm. flange 5 around its circumference.
- the thickness of the sectors 2, 3 was 5.5 mm., with the interconnecting webs 4 and tubular web 7 being thinner at 4.5 mm.
- the modification shown in Figure 4 is a suitable edge configuration when moulding a tubular shell together with the back plate as an integral moulding.
- a portion of the shell 8 is shown in section, joined to radial segments 2, 3 and interconnecting web 4. No circumferential flange is needed with such integral mouldings, but supporting brackets and other standard fittings can be moulded on to the outer surface of the shell, as required.
- the shell 8 is shown as having a thickness 'Y' the same as the webs 4.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Storage Of Web-Like Or Filamentary Materials (AREA)
Description
- The invention relates to wash tubs suitable for use in domestic front loading washing machines for laundering clothes, and in particular to wash tubs moulded, at least in part, from plastics materials.
- Washing machines of this kind are provided with a wash tub within which is mounted a rotatable drum for holding the clothes to be washed. The wash tubs are usually substantially cylindrical in shape with a back plate closing one end of the tub and a water-retaining flange at the other end of the tub, the tubs also having various lugs or brackets for mounting them in an outer casing.
- To avoid requiring excessive amounts of water, during washing, it is desirable to have minimum . clearance between the rotatable drum and the wash tub. However, the drum of a front loading machine is mounted solely on a bearing located at the centre of the back plate of the tub, and this may be subjected to strong mechanical stresses, especially during spin drying of an out-of-balance washing load. Any small flexing which occurs in the back plate is magnified at the open end of the drum, so that small clearances there may be lost, usually with catastrophic results.
- Flexing of the back plate is generally more difficult to prevent in tubs moulded from plastics material than in those using traditional metals, and current designs have tackled this problem by using back plates having particularly stiff spatial configurations, and by using moulding compositions and procedures which are well known techniques for obtaining stiffer products. Thus the preferred shape which has been developed is that often referred to as a "Greek Fan" and comprises a plurality of sectors, typically between twelve and eighteen in number. The inner end of each sector adjacent the bearing for the drum is displaced axially of the tub with respect to the adjacent sectors. There is usually little or no relative axial displacement at the outer ends of the adjacent sectors. Adjacent sectors are interconnected along their radial edges by axially extending webs; thus an annular section of the back plate at part radius has a castellated configuration.
- It is a well known general principle in plastics technology, that a foamed moulding, by virtue of its greater thickness, will have a greater panel stiffness than an unfoamed panel of the same weight. It is therefore not surprising that with the intention of obtaining maximum panel stiffness, wash tub back plates are currently being moulded from plastics compositions containing foaming agents to produce relatively thick foamed panels, e.g. as a foamed core with substantially solid skins on either side often referred to as "Structural Foam".
- However, as a basis for this invention it has now been found that for wash tub back plates in a Greek Fan configuration, panel stiffness is not the critical parameter in determining its overall rigidity. The major stresses are tensile and compressive rather than bending. Consequently a more rigid back plate with less material and shorter moulding cycles, and hence at substantially lower cost, can be obtained by producing thinner panels without using a foaming cycle.
- Accordingly, the present invention provides a wash tub for a front loading machine in which the back plate has a Greek Fan configuration comprising a plurality of sectors adjacent ones of which are relatively displaced axially of the tub and are joined along their radial edges by axially extending webs, the back plates being moulded from a plastics composition which is free from foaming agents
- A preferred wash tub is one having a tubular shell which is integrally moulded with the back plate from the same plastics composition which is free from foaming agent. The tubular shell preferably has a slight taper, e.g. about 4°, to assist in its removal from the moulding tool. It can also have a stepped radius, strengthening ribs and mounting lugs.
- A number of advantages accrue from the present invention. For example, the strength of a solid moulding is more predictable than that of a foamed moulding which has to be over- engineered to some extent to ensure adequate strength. A further requirement which is satisfied by the invention is that the back plate must not only be stiff, but it must have sufficient strength to withstand the repeated substantial loadings around the drum-supporting bearing without fracture. It has been found that when using a foaming composition, it was unfortunately in these most highly stressed areas where most foaming occurs during moulding. Moreover, the very presence of foaming agent necessitates longer cycle times to prevent post moulding blowing, with a result that for this particular shape, any saving in material cost which might have been achieved by foaming would be small, and the additional production costs can be a greater effect. Indeed, this can be exacerbated when demand for a high production rate can only be met on the longer foaming cycles by using additional moulding tools.
- In practice a back plate is preferred in which the thickness of the sectors is greater than the thickness of their interconnecting webs. Advantageously the thickness of the sectors is between 5 mm and 6 mm. The thickness ratio of web to sector lies preferably within the range 0.75 to 0.9, especially about 0.8. Thus, for example, 5.5 mm thick solid sectors combined with only 4.5 mm thick interconnecting webs, give a strong and stiff back plate configuration for moulding from 30% glass filled polypropylene. Also, advantageously the thickness of the cylindrical shell portion of the wash tub is less than the thickness of the sectors and is, for example, the same as the thickness of the axially extending webs.
- The sectors of the back plates are preferably all orientated with their planes at an angle of less than 90° to the axis of rotation of the drum and all slope in the same direction This is in contrast to known Greek Fan back plates the planes of whose sectors slope in opposite directions. The angle of orientation of alternate sectors is preferably less than that of the other sectors therebetween by an amount within the range of 5 to 25°, such that the outer ends of ajacent sectors are closer together than the inner ends of adjacent sectors.
- It has also been found that rigidity may be improved by providing part way along the radius of the sectors an annularweb joining together the axially extending webs, the annular web being coaxial with the axis of drum rotation. The annular web is most suitably at a radius of between one quarter and one half, preferably about one third, the radius of the back plate, and the axial length of the web is preferably equal to the axial length of the interconnecting webs at the same radius.
- Preferred plastics compositions are fiber reinforced thermoplastics materials, especially glass filled polypropylene containing at least 20% by eight of glass fibres.
- The invention is further illustrated by reference to a specific embodiment thereof shown in the accompanying drawings, in which
- Figure 1 is an axial view of a back plate according to the invention,
- Figure 2 is a section along the line 1111 of Figure 1, Figure 3 is a section along the line III III of Figure 1, and
- Figure 4 is a detail of Figure 3 modified to show an alternative configuration.
- The back plate 1 shown in the drawings has a Greek Fan configuration comprising a plurality of
sectors Adjacent sectors sectors - The planes of the
sectors - Around the circumference is a flange 5, which is joined to all the
sectors sectors hub 6 for housing a drum-supporting bearing (not shown), adjacent sectors being connected to opposite ends of the hub, as shown in Figure 3. At about one third of the back plate radius, is anannular web 7, which is joined to each of the webs 4. - A back plate substantially as illustrated was injection moulded from a polypropylene composition containing 30% by weight of glass fibre, and in the absence of any blowing agent it emerged as a single integral moulding of solid plastics composition. The diameter of the back plate was 470 mm., plus a 35 mm. flange 5 around its circumference. The thickness of the
sectors tubular web 7 being thinner at 4.5 mm. - The modification shown in Figure 4 is a suitable edge configuration when moulding a tubular shell together with the back plate as an integral moulding. A portion of the shell 8 is shown in section, joined to
radial segments
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8217437 | 1982-06-16 | ||
GB8217437 | 1982-06-16 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0097483A2 EP0097483A2 (en) | 1984-01-04 |
EP0097483A3 EP0097483A3 (en) | 1985-12-04 |
EP0097483B1 true EP0097483B1 (en) | 1988-08-24 |
Family
ID=10531079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19830303432 Expired EP0097483B1 (en) | 1982-06-16 | 1983-06-14 | Wash tubs |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0097483B1 (en) |
JP (1) | JPS5957699A (en) |
DE (1) | DE3377802D1 (en) |
GB (1) | GB2121834B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2157326A (en) * | 1984-04-13 | 1985-10-23 | Philips Electronic Associated | Wash tub |
IT225670Y1 (en) * | 1991-11-27 | 1997-01-13 | Zanussi Elettrodomestici | PERFECTED PLASTIC TANK |
ATE151129T1 (en) * | 1992-07-14 | 1997-04-15 | Waschgeraete Gmbh I L | DRUM WASHING MACHINE |
IT1258088B (en) * | 1992-10-29 | 1996-02-20 | Zanussi Elettrodomestici | PROCEDURE FOR THE MANUFACTURE OF PLASTIC BASKET AND BASKET SO OBTAINED. |
GB2272913A (en) * | 1992-11-26 | 1994-06-01 | Caradon Rolinx | Tub for a top-loading washing machine |
IT245289Y1 (en) * | 1998-01-20 | 2002-03-20 | Electrolux Zanussi Elettrodome | PERFECTED PLASTIC TANK FOR WASHING MACHINE AND SIMILAR |
CN104711813A (en) * | 2013-12-12 | 2015-06-17 | 苏州三星电子有限公司 | Inner barrel rack of washing machine |
CN105483976B (en) * | 2015-12-04 | 2018-10-30 | 无锡小天鹅股份有限公司 | The bucket bottom of rotary drum washing machine |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1585926A1 (en) * | 1962-07-10 | 1969-10-09 | Siemens Elektrogeraete Gmbh | In the outer housing of a washing machine, dishwasher or the like. inserted suds container |
NL296843A (en) * | 1962-08-24 | |||
DE6605244U (en) * | 1968-01-30 | 1970-05-06 | Siemens Elektrogeraete Gmbh | LIQUID CONTAINER FOR DRUM WASHING MACHINES. |
DE7320627U (en) * | 1973-06-01 | 1973-08-30 | Cordes W Kg | Washer and extractor with a loading opening provided in the front |
JPS52130159A (en) * | 1976-04-23 | 1977-11-01 | Hitachi Ltd | Centrifugal dehydrating washer |
JPS5349399Y2 (en) * | 1977-09-02 | 1978-11-27 | ||
JPS54117164A (en) * | 1978-03-03 | 1979-09-11 | Matsushita Electric Ind Co Ltd | Single-tank type dehydration washing machine |
IT1136452B (en) * | 1980-07-03 | 1986-08-27 | Zanussi A Spa Industrie | PLASTIC TANK FOR WASHING MACHINES |
JPS5751027U (en) * | 1981-06-26 | 1982-03-24 |
-
1983
- 1983-06-14 GB GB08316199A patent/GB2121834B/en not_active Expired
- 1983-06-14 DE DE8383303432T patent/DE3377802D1/en not_active Expired
- 1983-06-14 EP EP19830303432 patent/EP0097483B1/en not_active Expired
- 1983-06-15 JP JP10601683A patent/JPS5957699A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE3377802D1 (en) | 1988-09-29 |
EP0097483A2 (en) | 1984-01-04 |
EP0097483A3 (en) | 1985-12-04 |
GB8316199D0 (en) | 1983-07-20 |
JPS5957699A (en) | 1984-04-03 |
GB2121834B (en) | 1985-12-04 |
GB2121834A (en) | 1984-01-04 |
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