WO2008102396A2 - Washing machine tank provided with external reinforcing cap on bottom wall - Google Patents

Washing machine tank provided with external reinforcing cap on bottom wall Download PDF

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Publication number
WO2008102396A2
WO2008102396A2 PCT/IT2008/000098 IT2008000098W WO2008102396A2 WO 2008102396 A2 WO2008102396 A2 WO 2008102396A2 IT 2008000098 W IT2008000098 W IT 2008000098W WO 2008102396 A2 WO2008102396 A2 WO 2008102396A2
Authority
WO
WIPO (PCT)
Prior art keywords
washing machine
cap
bottom wall
tank
machine tank
Prior art date
Application number
PCT/IT2008/000098
Other languages
French (fr)
Other versions
WO2008102396A3 (en
Inventor
Gianfranco Bacelli
Stefano Mancini
Simone Pardini
Giuseppe Perticara
Original Assignee
Meccanica Generale S.R.L.
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
Priority claimed from ITAN20070008 external-priority patent/ITAN20070008A1/en
Priority claimed from ITAN20070009 external-priority patent/ITAN20070009A1/en
Priority to US12/449,496 priority Critical patent/US20100287995A1/en
Priority to SI200830515T priority patent/SI2129823T1/en
Priority to BRPI0810058-6A priority patent/BRPI0810058A2/en
Priority to AT08720243T priority patent/ATE529560T1/en
Priority to EP08720243A priority patent/EP2129823B1/en
Priority to UAA200909594A priority patent/UA97265C2/en
Priority to ES08720243T priority patent/ES2375587T3/en
Priority to JP2009550778A priority patent/JP2010532671A/en
Application filed by Meccanica Generale S.R.L. filed Critical Meccanica Generale S.R.L.
Priority to CN2008800057002A priority patent/CN101631907B/en
Priority to AU2008218504A priority patent/AU2008218504A1/en
Priority to PL08720243T priority patent/PL2129823T3/en
Priority to MX2009008949A priority patent/MX2009008949A/en
Priority to CA002677886A priority patent/CA2677886A1/en
Priority to KR1020097018649A priority patent/KR101578776B1/en
Publication of WO2008102396A2 publication Critical patent/WO2008102396A2/en
Publication of WO2008102396A3 publication Critical patent/WO2008102396A3/en
Priority to EG2009081236A priority patent/EG25143A/en
Priority to HR20120034T priority patent/HRP20120034T1/en

Links

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
    • 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
    • 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
    • D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
    • 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
    • D06F37/267—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups
    • D06F37/268—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups for suspension devices
    • 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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/12—Casings; Tubs

Definitions

  • Washing machine tank provided with external reinforcing cap on bottom wall.
  • the present patent application for industrial invention relates to a washing machine tank provided with an external reinforcing cap on the bottom wall.
  • the washing unit of washing machines or dryer/washer combos comprises a basically cylindrical drum designed to be loaded with laundry, which rotates inside a tank obtained by moulding plastic materials.
  • a similar tank is frontally provided with a large opening to load the laundry, while the bottom wall is provided with a central hole that ends in a rear cylindrical nozzle, where the shaft protruding from the bottom wall of the drum contained in the tank is exactly inserted, with the interposition of a bearing support.
  • the shaft slightly protrudes outside the tank in order to be coupled with the electrical motor designed to drive the drum into rotation.
  • the electrical motor is mounted in peripheral position with respect to the bottom wall of the cylindrical tank; in such a case, a drive belt is provided to ensure the joint rotation of the shaft of the electrical motor and the shaft of the drum, which are both suitably provided with corresponding pulleys.
  • the so-called "direct drive” technology is used, according to which the stator of the electrical motor is mounted in the centre of the bottom wall of the tank in such a way that the rotor is directly splined to the shaft of the drum.
  • the bottom wall of the washing machine tank must be characterised by high structural rigidity in order to withstand without damages the high mechanical stress induced by the centrifugal force generated by the mass of the laundry contained in the rotating drum.
  • the bottom wall of the tank is given an "omega" profile in which some sections of the wall protrude inwards. In fact, such a configuration gives the bottom wall of the tank a high inertia momentum.
  • a manufacturer of washing machine tanks must produce at least five different models of tanks, each of them with different rigidity and resistance according to the rotation speed of the specific appliance.
  • the tanks with bottom wall provided with "omega" profile are impaired by the fact that they create considerable turbulence in the water mass contained inside the tank, with consequent high noise level inside the appliance, formation of foam that requires more rinsing water, and considerable washing residues in the concave areas of the bottom wall that are not removed by the rinsing water.
  • the washing residues originate the so-called "biofilm", which is considered detrimental because it favours the proliferation of bacteria and consequent production of bad odours.
  • the purpose of the present invention is to find a solution to the aforementioned problems of the prior technique, in order to reduce production costs and increase technical-functional efficiency and versatility considerably.
  • the inventive idea of the present invention consists in a special composite structure of the bottom wall of a washing machine tank.
  • the tank of the invention is provided with a bottom wall with smooth surface both internally and externally.
  • the plastic moulded cap is preferably provided with a plurality of spokes, being otherwise defined as cross-piece.
  • spokes of the cap are internally hollow, it appears evident that, in cooperation with the external side of the flat bottom of the tank of the invention, the spokes originate a box-shaped structure with multiple spokes, which is effectively able to guarantee a considerable inertia momentum both with respect to flexural and torsional stress.
  • both the smooth bottom wall of the tank and the cap have modest inertia values due to reduced thickness.
  • the presence of a perfectly smooth bottom wall ensures better practical and economic characteristics with reference to moulding, not only because of the lower complexity of the moulds, but also because of the lower quantity of plastic material used.
  • the elimination of the inward protruding sections that are typical of tanks with "omega" bottom completely prevents the formation of the undesirable biofilm.
  • the presence of the smooth bottom wall of the tank of the invention generates an excellent distribution of the surface tension that tend to be created in a totally non-uniform way in the more complicated structures of the pre-existing tanks, impairing the mechanical characteristics of the same tanks.
  • the composite structure of the bottom wall of the tank of the invention ensures practical and economic characteristics also with reference to the production of different models of tanks for washing machines with different rotation speeds.
  • each specific type of washing machine requires a specific tank with specific rigidity and mechanical resistance properties according to the maximum rotation speed.
  • a manufacturer that makes use of the technology of the invention will produce a single model of tank, which will be adapted to each specific model of washing machine by means of a diversified production of caps (according to the different thickness and profile of the caps).
  • - fig. 2 is an axonometric external view of the said cap
  • - fig. 3 is an axonometric internal view of the said cap
  • - fig. 4 is an axonometric view of the aforementioned components one in front of the other one, without permanent fixing;
  • - fig. 5 is an axonometric view of the tank in assembled condition
  • the tank of the invention (1 ) is usually composed of a plastic moulded cylindrical structure and designed to be frontally closed with a circular flange (not shown in the enclosed figures) provided with a large opening used to load laundry inside the traditional rotary drum (not shown in the enclosed figures) housed in the tank.
  • the peculiarity of the new tank (1) consists in the presence of a smooth bottom wall (2) without stiffening ribs or inward projecting areas.
  • the wall (2) is provided with a central hole (2a) that receives the shaft of the drum housed in the tank (1 ).
  • the second component of the tank (1 ) consists in a sort of circular cap (3) provided with a plurality of internally hollow spokes (3a) obtained by moulding plastic materials.
  • spokes (3a) protrude from a central cylindrical nozzle (3b) and are joined at the peripheral ends with the internally hollow annular border (3c) of the cap (3).
  • the central nozzle (3b) is considerably longer than the thickness of the annular perimeter border (3c); because of this, the spokes (3a) have a section with decreasing height from the centre to the peripheral area.
  • the cylindrical nozzle (3b) is designed to house a metal bearing support (SP) that receives exactly the shaft of the drum after passing through the hole (2a) of the bottom wall (2) of the tank (1 ); reference is made to figure 2 that shows the said support (SP) in an exploded view.
  • SP metal bearing support
  • the bearing support (SP) is preferably co-moulded with the cap (3).
  • the cap (3) is designed to be fixed in external position on the flat bottom wall (2) of the tank (1 ), with the concave side facing the flat wall (2).
  • the cap (3) has a basically identical diameter as the bottom wall (2) of the tank (1 ) and the central nozzle (3b) of the cap (3) is perfectly aligned with the hole (2a) obtained in the bottom wall (2).
  • the cooperation between the cap (3) and the bottom wall (2) of the tank (1) allows to obtain a box-shaped structure on the back of the tank, which is composed of a series of radial compartments (V1 ), each of them is bordered by one of the spokes (3a) of the cap (3), and an annular compartment (V2) bordered by the annular border (3c) of the cap (3).
  • V1 radial compartments
  • V2 annular compartment bordered by the annular border (3c) of the cap (3).
  • the presence of the box-shaped structure allows the bottom wall (2) to acquire the necessary resistance to withstand without damages the mechanical stress transmitted by the rotations of the shaft of the drum full with wet laundry.
  • the stable fixing of the cap (3) against the bottom wall (2) of the tank (1 ) can be obtained according to different suitable modes, such as gluing, welding or screwing.
  • the cap (3) can be also provided on the external side with basically cylindrical appendixes (4, 5) obtained during the same process and with the same moulding material used for the cap (3).
  • the appendixes (4, 5) have a parallel position to the central nozzle
  • each appendix (4, 5) is frontally provided with a corresponding axial hole (4a, 5a) used to screw a corresponding screw.
  • a first opposite pair (4) of appendixes is provided at a higher height directly protruding from the annular border (3c), and a second pair (5) of appendixes is provided at a lower height protruding on the front of corresponding small hollow arms (5b) that protrude radially from the annular border (3c).
  • a third pair (6) of similar appendixes is provided between the two appendixes of the second pair (6), protruding on the front of corresponding small hollow arms (6b), designed to be used to fix the electrical motor that drives into rotation the shaft of the drum housed inside the cylindrical nozzle (3b) of the cap (3) by means of a drive belt.
  • the appendixes (6) of the third pair are frontally provided with axial holes (6a) for suitable fixing screws.
  • the small radial arms (5a, 6a) are provided with corresponding internal cavities designed to be exactly covered, when the cap (3) is engaged to the bottom wall (2) of the tank (1 ), by corresponding ears (50a, 60a) that protrude from the border of the bottom wall (2) of the tank (1 ) to generate relevant box- shaped structures.
  • figure 6 shows the embodiment of the cap (3) designed to mount the electrical motor according to the direct drive technology.
  • the external surface of the cap (3) is provided with three fixing holes (3d) for the stator (ST), with a corresponding rotor (RT) that rotates outside it splined to the shaft of the drum that partially protrudes from the cylindrical nozzle (3b) of the cap (3).

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)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)

Abstract

The present invention relates to a washing machine tank(l), of the type provided with a basically cylindrical structure obtained by moulding plastic materials, designed to house a rotary metal drum, characterised in that it is provided with a smooth bottom wall (2) with central hole, against which a circular cap (3) is exactly engaged and permanently fixed with concavity facing the bottom wall, with a cylindrical nozzle in central position designed to be perfectly aligned with the central hole of the bottom wall.

Description

Description
Washing machine tank provided with external reinforcing cap on bottom wall.
The present patent application for industrial invention relates to a washing machine tank provided with an external reinforcing cap on the bottom wall.
As it is known, the washing unit of washing machines or dryer/washer combos comprises a basically cylindrical drum designed to be loaded with laundry, which rotates inside a tank obtained by moulding plastic materials.
A similar tank is frontally provided with a large opening to load the laundry, while the bottom wall is provided with a central hole that ends in a rear cylindrical nozzle, where the shaft protruding from the bottom wall of the drum contained in the tank is exactly inserted, with the interposition of a bearing support.
In particular, the shaft slightly protrudes outside the tank in order to be coupled with the electrical motor designed to drive the drum into rotation.
In some cases, the electrical motor is mounted in peripheral position with respect to the bottom wall of the cylindrical tank; in such a case, a drive belt is provided to ensure the joint rotation of the shaft of the electrical motor and the shaft of the drum, which are both suitably provided with corresponding pulleys.
In other cases, the so-called "direct drive" technology is used, according to which the stator of the electrical motor is mounted in the centre of the bottom wall of the tank in such a way that the rotor is directly splined to the shaft of the drum.
In both cases, however, the bottom wall of the washing machine tank must be characterised by high structural rigidity in order to withstand without damages the high mechanical stress induced by the centrifugal force generated by the mass of the laundry contained in the rotating drum.
So far, the said rigidity of the bottom wall has been guaranteed by means of a network of stiffening ribs provided on the outside of the tank.
When the presence of the said ribs is not sufficient, the bottom wall of the tank is given an "omega" profile in which some sections of the wall protrude inwards. In fact, such a configuration gives the bottom wall of the tank a high inertia momentum.
A careful examination of the state of the art has identified several critical aspects.
In particular, the formation of the external stiffening ribs requires a large use of moulding material and sophisticated expensive moulds, with very long moulding time especially due to the need to cool down the ribs.
By considering that the market offers different models of washing machines in terms of rotation speed of the drums (from 400 to 1 ,600 rpm.), it is clear that each model of washing machine must be provided with a tank with specific mechanical resistance characteristics according to the different stress imposed by the rotation of the drum.
In view of this, a manufacturer of washing machine tanks must produce at least five different models of tanks, each of them with different rigidity and resistance according to the rotation speed of the specific appliance.
Moreover, the tanks with bottom wall provided with "omega" profile are impaired by the fact that they create considerable turbulence in the water mass contained inside the tank, with consequent high noise level inside the appliance, formation of foam that requires more rinsing water, and considerable washing residues in the concave areas of the bottom wall that are not removed by the rinsing water.
The washing residues originate the so-called "biofilm", which is considered detrimental because it favours the proliferation of bacteria and consequent production of bad odours. The purpose of the present invention is to find a solution to the aforementioned problems of the prior technique, in order to reduce production costs and increase technical-functional efficiency and versatility considerably.
The inventive idea of the present invention consists in a special composite structure of the bottom wall of a washing machine tank.
More precisely, the tank of the invention is provided with a bottom wall with smooth surface both internally and externally.
This allows to eliminate the traditional stiffening ribs that protrude outwards and the raised areas with that protrude inwards, of the type used in the bottom wall of tanks provided with "omega" profile.
In this case the task to give the necessary rigidity and resistance to mechanical stress is entrusted to a circular cap designed to be exactly fitted against the external side of the bottom wall of the tank.
The plastic moulded cap is preferably provided with a plurality of spokes, being otherwise defined as cross-piece.
Considering that the spokes of the cap are internally hollow, it appears evident that, in cooperation with the external side of the flat bottom of the tank of the invention, the spokes originate a box-shaped structure with multiple spokes, which is effectively able to guarantee a considerable inertia momentum both with respect to flexural and torsional stress.
If considered individually, both the smooth bottom wall of the tank and the cap have modest inertia values due to reduced thickness.
Their stable coupling, however, allows to create the box-shaped structure effectively provided with mechanical characteristics compatible with the correct operation of a washing machine.
The advantages of the invention appear evident from this first description.
First of all, the presence of a perfectly smooth bottom wall ensures better practical and economic characteristics with reference to moulding, not only because of the lower complexity of the moulds, but also because of the lower quantity of plastic material used. The elimination of the inward protruding sections that are typical of tanks with "omega" bottom completely prevents the formation of the undesirable biofilm. The presence of the smooth bottom wall of the tank of the invention generates an excellent distribution of the surface tension that tend to be created in a totally non-uniform way in the more complicated structures of the pre-existing tanks, impairing the mechanical characteristics of the same tanks.
Moreover, the composite structure of the bottom wall of the tank of the invention ensures practical and economic characteristics also with reference to the production of different models of tanks for washing machines with different rotation speeds. As mentioned earlier, according to the prior technique, each specific type of washing machine requires a specific tank with specific rigidity and mechanical resistance properties according to the maximum rotation speed.
Because of the present invention, all different types of washing machines use the same type of tanks, being provided that the task to guarantee the correct index of mechanical resistance to the bottom wall of the tank is entrusted to the cap with multiple spokes.
In view of the above, a manufacturer that makes use of the technology of the invention will produce a single model of tank, which will be adapted to each specific model of washing machine by means of a diversified production of caps (according to the different thickness and profile of the caps).
The need to produce a different range of caps is certainly more practical and cost-effective compared to the current need to produce a different range of tanks.
Finally, it must be noted that the favourable weight/performance ratio determined in the tank of the invention because of the assembly between the bottom wall of the tank and the cap contributes to optimise the traditional appendixes provided on the perimeter of washing machine tanks.
Reference is made to the appendixes designed to favour the assembly in peripheral position of the electrical motor designed to drive the internal drum into rotation, and also to the appendixes used to apply fixing means used to join the tank to the bearing case of the household appliance during packaging and transport operations (when the tank, which is usually mounted on elastic elements; is subjected to undesired dangerous shocks).
For clarity purposes the description of the invention continues with reference to the enclosed drawings, which only have an illustrative, not limiting purpose, whereby: - fig. 1 is an axonometric view of the tank of the invention, without the reinforcing cap;
- fig. 2 is an axonometric external view of the said cap;
- fig. 3 is an axonometric internal view of the said cap;
- fig. 4 is an axonometric view of the aforementioned components one in front of the other one, without permanent fixing;
- fig. 5 is an axonometric view of the tank in assembled condition;
- fig. 6 is an axonometric exploded view of the tank, in the embodiment designed to be associated with the corresponding electrical motor according to the direct drive technology. With reference to fig. 1 , the tank of the invention (1 ) is usually composed of a plastic moulded cylindrical structure and designed to be frontally closed with a circular flange (not shown in the enclosed figures) provided with a large opening used to load laundry inside the traditional rotary drum (not shown in the enclosed figures) housed in the tank. As mentioned earlier, the peculiarity of the new tank (1) consists in the presence of a smooth bottom wall (2) without stiffening ribs or inward projecting areas.
The wall (2) is provided with a central hole (2a) that receives the shaft of the drum housed in the tank (1 ). With reference to figs. 2 and 3, the second component of the tank (1 ) consists in a sort of circular cap (3) provided with a plurality of internally hollow spokes (3a) obtained by moulding plastic materials.
In particular, the spokes (3a) protrude from a central cylindrical nozzle (3b) and are joined at the peripheral ends with the internally hollow annular border (3c) of the cap (3).
As shown in figures 2 and 3, the central nozzle (3b) is considerably longer than the thickness of the annular perimeter border (3c); because of this, the spokes (3a) have a section with decreasing height from the centre to the peripheral area.
The cylindrical nozzle (3b) is designed to house a metal bearing support (SP) that receives exactly the shaft of the drum after passing through the hole (2a) of the bottom wall (2) of the tank (1 ); reference is made to figure 2 that shows the said support (SP) in an exploded view.
The bearing support (SP) is preferably co-moulded with the cap (3). In any case, the cap (3) is designed to be fixed in external position on the flat bottom wall (2) of the tank (1 ), with the concave side facing the flat wall (2).
In order to guarantee the mutual coupling between the two components, the cap (3) has a basically identical diameter as the bottom wall (2) of the tank (1 ) and the central nozzle (3b) of the cap (3) is perfectly aligned with the hole (2a) obtained in the bottom wall (2). The cooperation between the cap (3) and the bottom wall (2) of the tank (1) allows to obtain a box-shaped structure on the back of the tank, which is composed of a series of radial compartments (V1 ), each of them is bordered by one of the spokes (3a) of the cap (3), and an annular compartment (V2) bordered by the annular border (3c) of the cap (3). The presence of the box-shaped structure allows the bottom wall (2) to acquire the necessary resistance to withstand without damages the mechanical stress transmitted by the rotations of the shaft of the drum full with wet laundry.
The stable fixing of the cap (3) against the bottom wall (2) of the tank (1 ) can be obtained according to different suitable modes, such as gluing, welding or screwing.
The cap (3) can be also provided on the external side with basically cylindrical appendixes (4, 5) obtained during the same process and with the same moulding material used for the cap (3). The appendixes (4, 5) have a parallel position to the central nozzle
(3b) and are designed to favour the application of the means used to ensure the stable fixing of the entire tank (1 ) to the bearing structure of the washing machine during packaging and transportation.
To that end, each appendix (4, 5) is frontally provided with a corresponding axial hole (4a, 5a) used to screw a corresponding screw.
In particular, in the embodiment of the cap (3) shown in the enclosed figures, a first opposite pair (4) of appendixes is provided at a higher height directly protruding from the annular border (3c), and a second pair (5) of appendixes is provided at a lower height protruding on the front of corresponding small hollow arms (5b) that protrude radially from the annular border (3c). Finally, a third pair (6) of similar appendixes is provided between the two appendixes of the second pair (6), protruding on the front of corresponding small hollow arms (6b), designed to be used to fix the electrical motor that drives into rotation the shaft of the drum housed inside the cylindrical nozzle (3b) of the cap (3) by means of a drive belt. Also the appendixes (6) of the third pair are frontally provided with axial holes (6a) for suitable fixing screws.
The small radial arms (5a, 6a) are provided with corresponding internal cavities designed to be exactly covered, when the cap (3) is engaged to the bottom wall (2) of the tank (1 ), by corresponding ears (50a, 60a) that protrude from the border of the bottom wall (2) of the tank (1 ) to generate relevant box- shaped structures.
In this way, also the small arms (5a, 6a) are advantageously given high mechanical resistance during operation.
Finally, figure 6 shows the embodiment of the cap (3) designed to mount the electrical motor according to the direct drive technology.
In such a case, the external surface of the cap (3) is provided with three fixing holes (3d) for the stator (ST), with a corresponding rotor (RT) that rotates outside it splined to the shaft of the drum that partially protrudes from the cylindrical nozzle (3b) of the cap (3).

Claims

Claims
1 ) Washing machine tank of the type provided with a basically cylindrical structure obtained by moulding plastic materials, designed to house a rotary metal drum, characterised in that it is provided with a smooth bottom wall (2) with a central hole (2a), against which a cap (3) is exactly engaged and permanently fixed with concavity facing the bottom wall (2), with a cylindrical nozzle (3b) in central position designed to be perfectly aligned with the central hole (2a) of the bottom wall (2).
2) Washing machine tank as claimed in claim 1 , characterised in that the nozzle (3b) of the cap (3) houses a metal bearing support (SP). 3) Washing machine tank as claimed in claim 1 , characterised in that the cap (3) is provided with a series of spokes (3a) starting from the central nozzle (3b) with corresponding cavities facing the bottom wall (2) of the tank (1 ).
4) Washing machine tank as claimed in claim 3, characterised in that the spokes (3a) of the cap (3) are coupled at the ends with an annular border (3c) with cavity facing the bottom wall (2) of the tank (1 ).
5) Washing machine tank as claimed in one or more of the above claims, characterised in that the central nozzle (3b) of the cap (3) is longer than the height of the annular border (3c) and, consequently, the spokes (3a) have a decreasing height from the centre to the peripheral area. 6) Washing machine tank as claimed in one or more of the above claims, characterised in that the annular border (3c) of the cap (3) is provided with appendixes (4, 5, 6) used to mount the fixing means to the bearing structure of the washing machine and the electrical motor.
7) Washing machine tank as claimed in claim 6, characterised in that the appendixes (4, 5, 6) have a basically cylindrical structure parallel to the central nozzle (3b) of the cap (3) and are provided with relevant axial holes (4a, 5a, 6a) used to insert screws or similar fixing means.
8) Washing machine tank as claimed in one or more of the above claims, characterised in that a first opposite pair (4) of appendixes designed to receive the fixing means of the bearing structure of the washing machine protrudes directly from the annular border (3c) of the cap 83) and a second opposite pair (5) of appendixes protrudes at a lower height protruding on the front of corresponding small arms (5b) that protrude radially from the annular border (3c). 9) Washing machine tank as claimed in one or more of the above claims, characterised in that the appendixes (6) designed to favour the mounting of an electrical motor protrude from corresponding small arms (6b) that protrude radially from the annular border (3c) of the cap (3).
10) Washing machine tank as claimed in one or more of the above claims, characterised in that the small radial arms (5a, 6a) protruding from the cap (3) are provided with internal cavities facing the bottom wall (2) of the tank (1 ) designed to engage exactly against corresponding ears (50a, 60a) protruding from the border of the bottom wall (2).
11 ) Washing machine tank as claimed in one or more of the above claims, characterised in that the cap (3) is frontally provided with holes (3d) for direct mounting of a stator (ST) of an electrical motor, with rotor (RT) splined to the shaft of the drum that protrudes slightly from the nozzle (3b).
PCT/IT2008/000098 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall WO2008102396A2 (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
CA002677886A CA2677886A1 (en) 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall
KR1020097018649A KR101578776B1 (en) 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall
CN2008800057002A CN101631907B (en) 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall
BRPI0810058-6A BRPI0810058A2 (en) 2007-02-21 2008-02-15 washer tank fitted with an external reinforcement cap on the back wall
AT08720243T ATE529560T1 (en) 2007-02-21 2008-02-15 WASHING MACHINE TANK WITH EXTERNAL REINFORCEMENT CAP ON THE BOTTOM
EP08720243A EP2129823B1 (en) 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall
UAA200909594A UA97265C2 (en) 2007-02-21 2008-02-15 Tank of a washing machine equipped with outer strengthening cover on the lower wall
ES08720243T ES2375587T3 (en) 2007-02-21 2008-02-15 WASHING MACHINE TANK PROVIDED WITH AN EXTERNAL REINFORCEMENT COAT ON THE LOWER WALL.
JP2009550778A JP2010532671A (en) 2007-02-21 2008-02-15 Washing tub with external reinforcement cap on the bottom wall
US12/449,496 US20100287995A1 (en) 2007-02-21 2008-02-15 Washing machine tank provided wtih external reinforcing cap on bottom wall
SI200830515T SI2129823T1 (en) 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall
AU2008218504A AU2008218504A1 (en) 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall
PL08720243T PL2129823T3 (en) 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall
MX2009008949A MX2009008949A (en) 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall.
EG2009081236A EG25143A (en) 2007-02-21 2009-08-16 Washing machine tank provided with external reinforcing cap on bottom wall.
HR20120034T HRP20120034T1 (en) 2007-02-21 2012-01-12 Washing machine tank provided with external reinforcing cap on bottom wall

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITAN20070008 ITAN20070008A1 (en) 2007-02-21 2007-02-21 NEW BATHTUB IN PLASTIC MATERIAL AND STRUCTURE BOX FOR WASHING MACHINES AND WASHING MACHINE WITH DIRECT MOTOR
ITAN20070009 ITAN20070009A1 (en) 2007-02-21 2007-02-21 WASHING MACHINE AND WASHING MACHINE WITH FRONTAL LOADING WITH TRADITIONAL TRANSMISSION OR "DIRECT DRIVE"
ITAN2007A000009 2007-02-21
ITAN2007A000008 2007-02-21

Publications (2)

Publication Number Publication Date
WO2008102396A2 true WO2008102396A2 (en) 2008-08-28
WO2008102396A3 WO2008102396A3 (en) 2008-11-06

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PCT/IT2008/000098 WO2008102396A2 (en) 2007-02-21 2008-02-15 Washing machine tank provided with external reinforcing cap on bottom wall

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US (1) US20100287995A1 (en)
EP (1) EP2129823B1 (en)
JP (1) JP2010532671A (en)
KR (1) KR101578776B1 (en)
CN (1) CN101631907B (en)
AT (1) ATE529560T1 (en)
AU (1) AU2008218504A1 (en)
BR (1) BRPI0810058A2 (en)
CA (1) CA2677886A1 (en)
EG (1) EG25143A (en)
ES (1) ES2375587T3 (en)
HR (1) HRP20120034T1 (en)
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SI (1) SI2129823T1 (en)
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ITMC20090027A1 (en) * 2009-02-13 2010-08-14 Meccanica Generale Srl BATHTUB FOR WASHING MACHINE OR DISHWASHER MAKER CONDUCTED.
EP2270273A1 (en) * 2009-06-29 2011-01-05 Electrolux Home Products Corporation N.V. Washing machine
EP3176302A1 (en) * 2015-12-01 2017-06-07 Whirlpool Corporation Laundry treating appliance
US10036114B2 (en) 2015-12-01 2018-07-31 Whirlpool Corporation Laundry treating appliance
US10053808B2 (en) 2015-12-01 2018-08-21 Whirlpool Corporation Laundry treating appliance
EP3378985A4 (en) * 2015-11-19 2018-11-21 Qingdao Haier Washing Machine Co., Ltd. Washing machine inner barrel and washing machine
US10487432B2 (en) 2015-12-01 2019-11-26 Whirlpool Corporation Laundry treating appliance

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DE102015101441A1 (en) 2015-02-02 2016-08-04 Miele & Cie. Kg Lye container for a washing machine
KR102412755B1 (en) * 2015-08-25 2022-06-27 삼성전자주식회사 Waching 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
US10326323B2 (en) 2015-12-11 2019-06-18 Whirlpool Corporation Multi-component rotor for an electric motor of an appliance
CN107201629B (en) * 2016-03-17 2021-01-05 合肥海尔滚筒洗衣机有限公司 Outer tub with reinforcing structure and washing machine having the same
CN107780139B (en) * 2016-08-29 2020-12-25 青岛海尔洗衣机有限公司 Outer bucket of washing machine and washing machine of structure strenghthened type
CN109790675A (en) * 2016-09-08 2019-05-21 菲舍尔和佩克尔应用有限公司 Electric appliance direct-driving motor mounting device
US10704180B2 (en) 2016-09-22 2020-07-07 Whirlpool Corporation Reinforcing cap for a tub rear wall of an appliance
BR102018004749A2 (en) * 2017-03-10 2018-10-30 Weg Equipamentos Eletricos S A closing system between lid and stator of electric machine, closing process between lid and stator of electric machine, and stator of electric machine
US10975513B2 (en) 2017-03-23 2021-04-13 Midea Group Co., Ltd. Tub with bearing housing insert for a laundry washing machine
US10487435B2 (en) 2017-03-23 2019-11-26 Midea Group Co., Ltd. Tub for a laundry washing machine
US10693336B2 (en) 2017-06-02 2020-06-23 Whirlpool Corporation Winding configuration electric motor

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ITMC20090027A1 (en) * 2009-02-13 2010-08-14 Meccanica Generale Srl BATHTUB FOR WASHING MACHINE OR DISHWASHER MAKER CONDUCTED.
EP2218816A1 (en) 2009-02-13 2010-08-18 Meccanica Generale S.R.L. Tub for washer or washer/dryer machine provided with conduits
EP2270273A1 (en) * 2009-06-29 2011-01-05 Electrolux Home Products Corporation N.V. Washing machine
EP3378985A4 (en) * 2015-11-19 2018-11-21 Qingdao Haier Washing Machine Co., Ltd. Washing machine inner barrel and washing machine
EP3176302A1 (en) * 2015-12-01 2017-06-07 Whirlpool Corporation Laundry treating appliance
US10036114B2 (en) 2015-12-01 2018-07-31 Whirlpool Corporation Laundry treating appliance
US10053808B2 (en) 2015-12-01 2018-08-21 Whirlpool Corporation Laundry treating appliance
US10125446B2 (en) 2015-12-01 2018-11-13 Whirlpool Corporation Laundry treating appliance
US10487432B2 (en) 2015-12-01 2019-11-26 Whirlpool Corporation Laundry treating appliance
US11236458B2 (en) 2015-12-01 2022-02-01 Whirlpool Corporation Laundry treating appliance

Also Published As

Publication number Publication date
EG25143A (en) 2011-09-25
US20100287995A1 (en) 2010-11-18
SI2129823T1 (en) 2012-02-29
MX2009008949A (en) 2009-08-31
ES2375587T3 (en) 2012-03-02
BRPI0810058A2 (en) 2019-03-06
JP2010532671A (en) 2010-10-14
AU2008218504A1 (en) 2008-08-28
KR20090111344A (en) 2009-10-26
ATE529560T1 (en) 2011-11-15
CN101631907B (en) 2011-11-23
KR101578776B1 (en) 2015-12-28
WO2008102396A3 (en) 2008-11-06
EP2129823B1 (en) 2011-10-19
PL2129823T3 (en) 2012-03-30
EP2129823A2 (en) 2009-12-09
CN101631907A (en) 2010-01-20
CA2677886A1 (en) 2008-08-28
RU2454492C2 (en) 2012-06-27
HRP20120034T1 (en) 2012-02-29
RU2009135025A (en) 2011-03-27

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