EP2104758A2 - System used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness - Google Patents

System used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness

Info

Publication number
EP2104758A2
EP2104758A2 EP08720185A EP08720185A EP2104758A2 EP 2104758 A2 EP2104758 A2 EP 2104758A2 EP 08720185 A EP08720185 A EP 08720185A EP 08720185 A EP08720185 A EP 08720185A EP 2104758 A2 EP2104758 A2 EP 2104758A2
Authority
EP
European Patent Office
Prior art keywords
column
fact
screw
self
wings
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
EP08720185A
Other languages
German (de)
French (fr)
Other versions
EP2104758B1 (en
Inventor
Carlo Perini
Pierluigi Pettinari
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.)
Vic - Viterie Italia Centrale Srl
Original Assignee
Vic - Viterie Italia Centrale Srl
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
Application filed by Vic - Viterie Italia Centrale Srl filed Critical Vic - Viterie Italia Centrale Srl
Priority to PL08720185T priority Critical patent/PL2104758T3/en
Publication of EP2104758A2 publication Critical patent/EP2104758A2/en
Application granted granted Critical
Publication of EP2104758B1 publication Critical patent/EP2104758B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • D06F37/265—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
    • 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

Definitions

  • the present patent application relates to a system used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness.
  • the present invention has been developed to optimise the solutions that are currently available on the market to provide exact matching and mutual fixing between objects with different toughness and surface hardness values.
  • the present description relates to the fixing of a plastic object to a cement object, being understood that the same fixing mode can be advantageously used, for instance, to fix a plastic object to a metal object, etc.
  • a typical - although not the only one - field of application of the new fixing technique may be the structure of a washing machine, where cement counterweights are fixed on the outside of plastic tubs.
  • concrete objects are normally fixed to plastic objects by obtaining a sort of cylindrical centring column on the plastic object designed to be exactly engaged with male-female coupling into a corresponding through housing obtained on the structure of the concrete object; the said column is centrally provided with an axial passage designed to engage a self- tapping screw from the outside of the concrete object.
  • the head of the screw energetically interferes against the external face of the concrete object, maintaining tight adhesion to the plastic object.
  • this condition would unavoidably occur during the vortical revolutions of the drum of the washing machine during spinning.
  • the problem is additionally worsened by the fact that in the two aforementioned objects the perfect matching of the contact surfaces determines some interference during mounting that prevents the easy matching of the two objects; for this reason, a certain mounting clearance is provided between the two objects.
  • the plastic object is provided with at least two of the aforementioned columns and, consequently, the concrete object is provided with a corresponding number of through housings.
  • a first purpose of the fixing system of the invention is to ensure a practical, easy method to efficaciously fix the two aforementioned objects, thus avoiding translation and clearance also in the presence of rototranslational stress.
  • the second purpose of the present invention is to permit the engagement of tightening screws in the passages of the said columns also in case of high tightening torques (which ensure highly stable matching) without the risk of breaking the plastic material used to obtain the said columns.
  • this result has been obtained by means of the special configuration given to the said columns, as explained in detail in the description below.
  • FIG. 1 is an axonometric exploded view of a plastic tub for washing machines and concrete counterweights assembled according to the fixing system of the invention
  • - figure 2 is an axonometric view of one of the columns obtained on the tub of figure 1 and the corresponding housing (cross-section with a diameter plane) obtained on one of the counterweights;
  • - figure 3 is a view of the column of figure 2 seen from an angle parallel to its longitudinal axis;
  • figure 4 is a view of the same column seen from angle 4-4 of figure 3;
  • - figure 5 is an axonometric view of an alternative constructive embodiment of the said column
  • - figure 6 is a view of the column of figure 5 seen from an angle parallel to its longitudinal axis
  • FIG. 7 is an axonometric view of a second alternative constructive embodiment of the said column
  • figure 8 is a view of the column of figure 7 seen from an angle parallel to its longitudinal axis;
  • figure 11 is a cross-sectional view of figure 10 with plane Xl-Xl;
  • figure 14 is a cross-sectional view of figure 13 with plane XIV-XIV;
  • figure 15 is an enlarged view of a detail of figure 14;
  • - figures 16 and 17 are views of an additional constructive embodiment of the said column seen from two different angles;
  • - figure 18 is a cross-sectional view of figure 17 with plane XVIII-XVIII;
  • figure 19 is a cross-sectional view of figure 17 with plane XIX-XIX.
  • a moulded plastic object (1 ) (a tub for washing machines in this specific case) is provided with one or more tapered columns (10) that protrude from corresponding bases, designed to be exactly engaged into corresponding through housings (20) obtained on the object (2) made of concrete material (a counterweight in this specific case).
  • the longitudinal axis of the bases (10a) coincides perfectly with the longitudinal axis of the columns (10), as shown in fig. 2 (where the base has a circular section) and in fig. 7 (where the base has an octagonal section); in other cases, the said bases (10b) are shaped as a block, with longitudinal axis perpendicular to the longitudinal axis of the columns (10), as shown in fig. 3.
  • the columns (10) are centrally provided with an axial passage (11 ) designed to receive a self-tapping screw (V) used to ensure the stability of the two cooperating objects (1 , 2).
  • the screw (V) is inserted into the passage (11) of the column (10) from outside the concrete object (2) and, more precisely, through the external opening (21 ) of the housing (20) that receives the column (10).
  • a washer (R) is preferably used in intermediate position to increase the tightness of the coupling ensured by the enlarged head of the screw (V).
  • the peculiarity of the fixing system of the invention consists in the special configuration given to the fluted columns (10) of the plastic object (1) and to the corresponding housings (20) of the concrete object (2).
  • both the fluted columns (10) and the housings (20) have a truncated-conical profile.
  • the columns (10) are externally provided in longitudinal direction with wings (12) having a spiral cross-section; it being provided, in particular, that the wings (12) are curved in the direction that corresponds to the screw-on direction (shown by the arrow F) of the self-tapping screw (V) designed to be engaged in the passage (11 ) of each column (10).
  • a right-hand screw is used in the case of the column (10) shown in figs. 2 and 3, so that the wings (12) are curved in clockwise direction.
  • the truncated-conical profile of the columns (10) facilitates the insertion of the said columns (10) inside the housings (20).
  • each column (10) and the housing (20) is more advantageous when the matching between the two objects (1 , 2) occurs by simultaneously inserting multiple columns (10) of the plastic object (1 ) into multiple housings (20) of the concrete object (2). As soon as each column (10) has penetrated the corresponding housing (20) for half of its height, a contact between the wings (12) of the column (10) and the internal walls (24) of the housing (20) is produced because of geometrical interference.
  • the wings (12) of the column (10) interfere exactly for the entire length against the corresponding internal walls (24) of the housing (20).
  • the elastic deformation of the wings (12) increases the friction against the internal walls (24) of the housings (20) on one side, and absorbs the torsional moment that tends to discharge on the entire column (10) on the other side. This condition totally prevents the risk of breaking the column (10) - as in the prior technique - due to excessive tortional stress.
  • the set of spiral wings (12) acts as a sort of spring, whose compression directly causes the screwing on of the self-tapping screw (V) inside the axial passage (11 ) of the column (10).
  • the spiral shape of the wings (12) prevents them from suffering dangerous abrasions caused by the internal walls (24) of the housing (20) of the concrete object (2) during the fixing operations of the two objects (1 , 2).
  • This allows to obtain perfect matching between each column (10) and the corresponding housing (20), due to the fact that the geometry of the column (10) is not modified (or, better said, thinned out) and therefore maintains its matching capability without clearance with the internal geometry of the housing (20).
  • the same inventive principle can be advantageously applied also with columns (10) having a cylindrical, rather than truncated-conical shape; nevertheless, the said cylindrical shape makes it more difficult to insert the columns (10) inside the housings (20).
  • each column (10) can be straight, and not curved, as long as each of them is given an inclination equal to the screw-on direction of the self-tapping screw (V), and not a radial direction; reference is specifically made to figures 6 and 8.
  • Figures 9, 10 and 11 show a column (10A) that is basically identical to the column (10) of figs. 3 , 4 and 5, except for the fact that it is provided with longitudinal wings (12) ending with a flute-beak profile (12a) that allows the wings (12) to adapt better to the surface of the housing (20) following to the plastic deformation of the external corners (12b) of the flute-beak profiles.
  • Figures 12, 13, 14 and 15 show a column (10B) characterised by the fact that the wings (120) are provided with a "boomerang" configuration, which includes a separation knee-piece (121 ) between the short initial section (120a) that branches out from the body of the column (10B) and the long final section (120b) with forward inclination in the screw-on direction of the self- tapping screw (V) .
  • the final section (120b) is inclined forward by an angle (b) in the screw-on direction of the self-tapping screw, while the short initial section (120a) is inclined backwards by an angle (a) .
  • the presence of the knee-piece (121) favours the elastic deformation of the wings (120), which is useful to recover possible small misalignments between the housings (20) obtained on the counterweights (2) and the columns (12B) that protrude from the plastic tub.
  • Figures 16, 17, 18 and 19 show a column (1 OC) characterised by the fact that the wings (122) have a variable inclination.
  • each wing (122) has a perfectly radial inclination as shown in the cross-sectional view of fig. 19, which cuts the column (120C) at the base.
  • each wing (122) is inclined forward by an angle in the screw-on direction of the self-tapping screw (V).
  • the radial section (122a) interferes with the surface of the housings (20) when the insertion of the column (10C) inside the housing (20) has been completed; in this case, the presence of the rigid, indeformable radial section (122a) efficiently opposes the dilatation of the hole (11) caused by the screw (V) engaged inside the hole (11 ) .

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Dowels (AREA)
  • Connection Of Plates (AREA)

Abstract

The present invention relates to a system used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness, by providing the plastic object with externally fluted columns designed to be engaged and fixed with screws to create friction against the internal walls of the through housings obtained on the structure of the object made of the material with higher toughness and surface hardness.

Description

Description
System used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness.
The present patent application relates to a system used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness.
More precisely, the present invention has been developed to optimise the solutions that are currently available on the market to provide exact matching and mutual fixing between objects with different toughness and surface hardness values.
For the purpose of simplicity, the present description relates to the fixing of a plastic object to a cement object, being understood that the same fixing mode can be advantageously used, for instance, to fix a plastic object to a metal object, etc.
As a matter of fact, a typical - although not the only one - field of application of the new fixing technique may be the structure of a washing machine, where cement counterweights are fixed on the outside of plastic tubs.
The peculiarities and advantages of the invention will become evident after a short description of the prior technique.
So far, concrete objects are normally fixed to plastic objects by obtaining a sort of cylindrical centring column on the plastic object designed to be exactly engaged with male-female coupling into a corresponding through housing obtained on the structure of the concrete object; the said column is centrally provided with an axial passage designed to engage a self- tapping screw from the outside of the concrete object.
With the addition of a suitable washer, the head of the screw energetically interferes against the external face of the concrete object, maintaining tight adhesion to the plastic object.
Nevertheless, such a matching requires high fixing torques in order to obtain high residual torques after the unavoidable spring back of the plastic object.
Without such an energetic fixing, the friction force between the two objects would not be sufficient to ensure permanent perfect adhesion when the objects are subjected to high stress loads.
For instance, this condition would unavoidably occur during the vortical revolutions of the drum of the washing machine during spinning.
The problem is additionally worsened by the fact that in the two aforementioned objects the perfect matching of the contact surfaces determines some interference during mounting that prevents the easy matching of the two objects; for this reason, a certain mounting clearance is provided between the two objects.
Moreover, in order to ensure stable and balanced fixing, the plastic object is provided with at least two of the aforementioned columns and, consequently, the concrete object is provided with a corresponding number of through housings.
Because of the fact that the shrinkage of the two different materials (plastics and concrete) is impossible to control, the mounting clearance must be especially increased, thus requiring considerably high reliable tightening torques.
Obviously, the presence of clearance reduces the exactness and stability of the matching, it being also evident that the said clearances are not completely recovered by means of a high tightening torque when the screw is engaged in the passage of the column obtained on the plastic object. As a matter of fact, such a high tightening force would damage the fragile structure of the column - with traumatic breakage - because of the stress caused by traction and torsion.
It is impossible to increase the resistance of the said columns by providing them with a structure with higher thickness; in fact, such a solution is prevented by the need to obtain the simultaneous uniform cooling of all the parts of the plastic object during moulding, which - as it is known - does not allow to have areas with highly differentiated thickness on the same object. In order to increase the resistance of the said columns, the same columns have been provided with external longitudinal wings; nevertheless, the geometry of traditional wings does not create exact interference with the internal walls of the corresponding concrete housings. In such a case, the necessary fixing clearance is eliminated, together with the possibility to centre the two objects easily, especially when the matching of the two objects requires the simultaneous insertion of multiple columns inside multiple housings.
Moreover, a similar interference between the columns of the plastic object and the internal walls of the housings on the concrete object results in the extrusion of the plastic columns caused by the highly-abrasive hard surface of the concrete housings.
A careful evaluation of the prior technique has led to the development of the present invention, which is able to ensure satisfactory matching between a plastic object with centring columns and a corresponding concrete object with housings.
As a matter of fact, a first purpose of the fixing system of the invention is to ensure a practical, easy method to efficaciously fix the two aforementioned objects, thus avoiding translation and clearance also in the presence of rototranslational stress.
The second purpose of the present invention is to permit the engagement of tightening screws in the passages of the said columns also in case of high tightening torques (which ensure highly stable matching) without the risk of breaking the plastic material used to obtain the said columns. In particular, this result has been obtained by means of the special configuration given to the said columns, as explained in detail in the description below.
For purposes of clarity the description of the present invention continues with reference to the enclosed drawings, which are intended for purposes of illustration only and not in a limiting sense, whereby:
- figure 1 is an axonometric exploded view of a plastic tub for washing machines and concrete counterweights assembled according to the fixing system of the invention;
- figure 2 is an axonometric view of one of the columns obtained on the tub of figure 1 and the corresponding housing (cross-section with a diameter plane) obtained on one of the counterweights; - figure 3 is a view of the column of figure 2 seen from an angle parallel to its longitudinal axis;
- figure 4 is a view of the same column seen from angle 4-4 of figure 3;
- figure 5 is an axonometric view of an alternative constructive embodiment of the said column; - figure 6 is a view of the column of figure 5 seen from an angle parallel to its longitudinal axis;
- figure 7 is an axonometric view of a second alternative constructive embodiment of the said column;
- figure 8 is a view of the column of figure 7 seen from an angle parallel to its longitudinal axis;
- figures 9 and 10 are views of an additional constructive embodiment of the said column seen from two different angles;
- figure 11 is a cross-sectional view of figure 10 with plane Xl-Xl;
- figures 12 and 13 are views of an additional constructive embodiment of the said column seen from two different angles;
- figure 14 is a cross-sectional view of figure 13 with plane XIV-XIV;
- figure 15 is an enlarged view of a detail of figure 14;
- figures 16 and 17 are views of an additional constructive embodiment of the said column seen from two different angles; - figure 18 is a cross-sectional view of figure 17 with plane XVIII-XVIII;
- figure 19 is a cross-sectional view of figure 17 with plane XIX-XIX.
With reference to figure 1 , a moulded plastic object (1 ) (a tub for washing machines in this specific case) is provided with one or more tapered columns (10) that protrude from corresponding bases, designed to be exactly engaged into corresponding through housings (20) obtained on the object (2) made of concrete material (a counterweight in this specific case). Sometimes, the longitudinal axis of the bases (10a) coincides perfectly with the longitudinal axis of the columns (10), as shown in fig. 2 (where the base has a circular section) and in fig. 7 (where the base has an octagonal section); in other cases, the said bases (10b) are shaped as a block, with longitudinal axis perpendicular to the longitudinal axis of the columns (10), as shown in fig. 3.
Moreover, the columns (10) are centrally provided with an axial passage (11 ) designed to receive a self-tapping screw (V) used to ensure the stability of the two cooperating objects (1 , 2). In particular, the screw (V) is inserted into the passage (11) of the column (10) from outside the concrete object (2) and, more precisely, through the external opening (21 ) of the housing (20) that receives the column (10).
In this way, once the threaded stem of the screw (V) is engaged inside the passage (11 ), the enlarged head of the screw (V) is able to travel energetically against the border (22) that surrounds the external opening (21 ) of the housing (20).
A washer (R) is preferably used in intermediate position to increase the tightness of the coupling ensured by the enlarged head of the screw (V).
Within the said technology, the peculiarity of the fixing system of the invention consists in the special configuration given to the fluted columns (10) of the plastic object (1) and to the corresponding housings (20) of the concrete object (2).
It must be noted that both the fluted columns (10) and the housings (20) have a truncated-conical profile. The columns (10) are externally provided in longitudinal direction with wings (12) having a spiral cross-section; it being provided, in particular, that the wings (12) are curved in the direction that corresponds to the screw-on direction (shown by the arrow F) of the self-tapping screw (V) designed to be engaged in the passage (11 ) of each column (10). A right-hand screw is used in the case of the column (10) shown in figs. 2 and 3, so that the wings (12) are curved in clockwise direction.
The truncated-conical profile of the columns (10) facilitates the insertion of the said columns (10) inside the housings (20).
As a matter of fact, insertion is made easier by the high "matching clearance" between each column (10) and the corresponding housing (20) at the beginning of the insertion, when the tapered end of the column (10) penetrates the internal larger opening (23) of the housing (20).
The easy mutual matching between each column (10) and the housing (20) is more advantageous when the matching between the two objects (1 , 2) occurs by simultaneously inserting multiple columns (10) of the plastic object (1 ) into multiple housings (20) of the concrete object (2). As soon as each column (10) has penetrated the corresponding housing (20) for half of its height, a contact between the wings (12) of the column (10) and the internal walls (24) of the housing (20) is produced because of geometrical interference.
Once the matching has been completed, the wings (12) of the column (10) interfere exactly for the entire length against the corresponding internal walls (24) of the housing (20).
It is important to note the behaviour of the wings (12) under the action of the tightening torque applied on the corresponding column (10) after the self-tapping screw (V) is screwed on inside the axial passage (11 ). The stress discharged on the column (10) generates a torsion of the column (10), thus favouring the creation of high friction in rotational direction between the wings (12) and the internal walls (24) of the housings (20), which prevents the uncontrolled free sliding of the wings (12) in the housings (20).
When the torsional torque caused by screwing on the self-tapping screw (V) increases, also the friction exerted by the wings (12) against the internal walls (24) of the housing (20) increases; in particular, this effect is produced following to the progressive elastic deformation generated on the wings (12), being subjected to a peak load.
The elastic deformation of the wings (12) increases the friction against the internal walls (24) of the housings (20) on one side, and absorbs the torsional moment that tends to discharge on the entire column (10) on the other side. This condition totally prevents the risk of breaking the column (10) - as in the prior technique - due to excessive tortional stress.
It can be otherwise said that in such a case the set of spiral wings (12) acts as a sort of spring, whose compression directly causes the screwing on of the self-tapping screw (V) inside the axial passage (11 ) of the column (10).
Moreover, it must be noted that the spiral shape of the wings (12) prevents them from suffering dangerous abrasions caused by the internal walls (24) of the housing (20) of the concrete object (2) during the fixing operations of the two objects (1 , 2). This allows to obtain perfect matching between each column (10) and the corresponding housing (20), due to the fact that the geometry of the column (10) is not modified (or, better said, thinned out) and therefore maintains its matching capability without clearance with the internal geometry of the housing (20). The same inventive principle can be advantageously applied also with columns (10) having a cylindrical, rather than truncated-conical shape; nevertheless, the said cylindrical shape makes it more difficult to insert the columns (10) inside the housings (20).
Likewise, the wings (12) of each column (10) can be straight, and not curved, as long as each of them is given an inclination equal to the screw-on direction of the self-tapping screw (V), and not a radial direction; reference is specifically made to figures 6 and 8.
It may be useful to explain the reason why the present inventive idea may not be applied in case of wings with perfectly radial direction. In such a case, the torsional stress applied to each column, together with the rotation of the column, would also cause a progressive loss of friction of the wings against the internal walls of the housing, consequent to the abrasion suffered by the wings because of the contact with the hard, rough internal walls of the object that houses them. In this case, the wings would tend to slide with respect to the internal walls of the housing, thus generating the opposite condition to the one that has been obtained with the present invention in order to prevent the uncontrolled free rotation of the column when the self-tapping screw is engaged.
Following is the description of some alternative constructive embodiments of the said column (10). Figures 9, 10 and 11 show a column (10A) that is basically identical to the column (10) of figs. 3 , 4 and 5, except for the fact that it is provided with longitudinal wings (12) ending with a flute-beak profile (12a) that allows the wings (12) to adapt better to the surface of the housing (20) following to the plastic deformation of the external corners (12b) of the flute-beak profiles. Figures 12, 13, 14 and 15 show a column (10B) characterised by the fact that the wings (120) are provided with a "boomerang" configuration, which includes a separation knee-piece (121 ) between the short initial section (120a) that branches out from the body of the column (10B) and the long final section (120b) with forward inclination in the screw-on direction of the self- tapping screw (V) .
As shown in the enlarged view of figure 15, the final section (120b) is inclined forward by an angle (b) in the screw-on direction of the self-tapping screw, while the short initial section (120a) is inclined backwards by an angle (a) . Under a peak load, the presence of the knee-piece (121) favours the elastic deformation of the wings (120), which is useful to recover possible small misalignments between the housings (20) obtained on the counterweights (2) and the columns (12B) that protrude from the plastic tub. Figures 16, 17, 18 and 19 show a column (1 OC) characterised by the fact that the wings (122) have a variable inclination. In particular, on the attachment (122a) to the base (10a), each wing (122) has a perfectly radial inclination as shown in the cross-sectional view of fig. 19, which cuts the column (120C) at the base.
The remaining section (122b) of each wing (122) is inclined forward by an angle in the screw-on direction of the self-tapping screw (V). The radial section (122a) interferes with the surface of the housings (20) when the insertion of the column (10C) inside the housing (20) has been completed; in this case, the presence of the rigid, indeformable radial section (122a) efficiently opposes the dilatation of the hole (11) caused by the screw (V) engaged inside the hole (11 ) .

Claims

Claims
1 ) System used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness, in which the plastic object (1 ) is provided with one or more columns (10, 10A, 10B, 10C) with circular cross-section designed to be engaged into corresponding through housings (20) obtained on the object made of non-plastic material (2) and fixed by means of a self-tapping screw (V) on the outside of each through housing (20), which is engaged inside a suitable axial passage (11 ) provided on the relevant column (10, 10A, 10B, 10C), system being characterised by the fact that each column (10, 10A, 10B, 10C) is externally provided with some longitudinal wings (12, 120, 122) having at least a section with inclined direction, with respect to a radial direction, in the same direction as the screw-on direction (F) of the self-tapping screw (V).
2) System as claimed in claim 1 , characterised by the fact that the wings (12, 120, 122) of each column (10, 10A, 10B, 10C) are curved according to a spiral profile, in the direction that corresponds to the screw-on direction of the self-tapping screw (V).
3) System as claimed in one of the above claims, characterised by the fact that the said columns (10, 10A, 10B, 10C) have a truncated-conical profile.
4) System as claimed in one or more of the above claims, characterised by the fact that each column (10, 10A, 10B, 10C) is supported at the top of a base (10a) with identical longitudinal axis.
5) System as claimed in one or more of claims 1 to 3, characterised by the fact that each column (10, 10A, 10B, 10C) is supported by a base (10b) with orthogonal longitudinal axis.
6) System as claimed in one or more of the above claims, characterised by the fact that each column (10A) is provided with longitudinal wings (12) ending with a flute-beak profile (12a).
7) System as claimed in one or more of the above claims, characterised by the fact that each column (10B) is provided with wings (120) having a "boomerang" configuration, which includes a separation knee-piece (121 ) between the short initial section (120a) that branches out from the body of the column (10B) and the long final section (120b) with forward inclination in the screw-on direction of the self-tapping screw (V).
8) System as claimed in the above claim, characterised by the fact that the final section (120b) is inclined forward by an angle (b) in the screw-on direction of the self-tapping screw (V), while the short initial section (120a) is inclined backwards by an angle (a).
9) System as claimed in one or more of the above claims, characterised by the fact that each column (10C) is provided with wings (122) with variable inclination.
10) System as claimed in the above claim, characterised by the fact that, on the attachment (122a) to the base (10a) each wing (122) has a perfectly radial inclination, while the remaining section (122b) of each wing (122) is inclined forward by an angle in the screw-on direction of the self-tapping screw (V).
11) Column with circular cross-section, of the type obtained in a plastic object (1 ) designed to be engaged inside a corresponding through housing (20) obtained in a corresponding object (2) made of a material with higher toughness and surface hardness and fixed by means of a self-tapping screw (V) on the outside of each through housing (20) engaged inside a suitable axial passage (11) provided on the relevant column (10, 10A, 10B 10C), column being characterised by the fact that it is externally provided with longitudinal wings (12, 120, 122) having at least one section with inclined direction, with respect to a radial direction, in the same direction as the screw-on direction of the self-tapping screw (V).
12) Column as claimed in claim 6, characterised by the fact that the wings (12) are curved according to a spiral profile, in the screw-on direction of the self-tapping screw (V).
13) Column as claimed in one of claims 6 and 7, characterised by the fact that it has a truncated-conical profile.
14) Column as claimed in one or more of claims 11 to 13, characterised by the fact that it is supported at the top of a base (10a) with identical longitudinal axis.
15) Column as claimed in one or more of claims 11 to 13, characterised by the fact that it is supported by a base (10b) with orthogonal longitudinal axis.
16) Column as claimed in one or more of the above claims, characterised by the fact that it consists in a column (10A) provided with longitudinal wings
(12) ending with a flute-beak profile (12a).
17) Column as claimed in one or more of the above claims, characterised by the fact that it consists in a column (10B) provided with wings (120) having a "boomerang" configuration, which includes a separation knee-piece (121) between the short initial section (120a) that branches out from the body of the column (10B) and the long final section (120b) with forward inclination in the screw-on direction of the self-tapping screw (V) .
18) Column as claimed in the above claim, characterised by the fact that the final section (120b) is inclined forward by an angle (b) in the screw-on direction of the self-tapping screw (V), while the short initial section (120a) is inclined backwards by an angle (a).
19) Column as claimed in one or more of the above claims, characterised by the fact that it consists in a column (10C) provided with wings (122) with variable inclination. 20) Column as claimed in the above claim, characterised by the fact that on the attachment (122a) to the base (10a) each wing (122) has a perfectly radial inclination, while the remaining section (122b) of each wing (122) is inclined forward by an angle in the screw-on direction the self-tapping screw (V). 21 ) Object made of plastic materials, of the type comprising one or more columns (10, 10A, 10B 10C) with circular cross-section designed to be engaged into corresponding through housings (20) obtained on an object (2) made of a different material with higher toughness and surface hardness, and fixed by means of self-tapping screws (V) on the outside of each through housing (20) engaged inside suitable axial passages (11) provided on the relevant columns (10, 10A, 10B, 10C), object being characterised by the fact that the columns (10, 10A, 10B, 10C) are externally provided with longitudinal wings (12,120,122) having at least one section with inclined direction, with respect to a radial direction, in the same direction as the screw-on direction of the self-tapping screws (V).
22) Object made of plastic materials as claimed in claim 21 , being characterised by the fact that the wings (12, 120, 122) of the columns (10,
10A, 10B, 10C) are curved according to a spiral profile, in the screw-on direction of the self-tapping screws (V).
23) Object made of plastic materials as claimed in one of the above claims, characterised by the fact that the columns (10, 10A, 10B, 10C) have a truncated-conical profile.
24) Object made of plastic materials as claimed in one or more of the above claims, characterised by the fact that the columns (10, 10A, 10B, 10C) are supported on top of bases (10a) with identical longitudinal axis.
25) Object made of plastic materials as claimed in one or more of claims 21 to 23, characterised by the fact that the columns (10) are supported at the top of bases (10b) with orthogonal longitudinal axis.
26) Object as claimed in one or more of the above claims, characterised by the fact that it comprises at least one column (10A) provided with longitudinal wings (12) ending with a flute-beak profile (12a). 27) Object as claimed in one or more of the above claims, characterised by the fact that it comprises at least one column (10B) provided with wings (120) having a "boomerang" configuration, which includes a separation knee-piece (121 ) between the short initial section (120a) that branches out from the body of the column (10B) and the long final section (120b) with forward inclination in the screw-on direction of the self-tapping screw (V).
28) Object as claimed in the above claim, characterised by the fact that the final section (120b) is inclined forward by an angle (b) in the screw-on direction of the self-tapping screw (V), while the short initial section (120a) is inclined backwards by an angle (a). 29) Object as claimed in one or more of the above claims, characterised by the fact that it comprises at least one column (10C) provided with wings (122) with variable inclination. 30) Object as claimed in the above claim, characterised by the fact that on the attachment (122a) to the base (10a) each wing (122) has a perfectly radial inclination, while the remaining section (122b) of each wing (122) is inclined forward by an angle in the screw-on direction of the self-tapping screw (V).
31) Object made of plastic materials as claimed in one or more claims 21 to 30, characterised by the fact that it consists in a tub for washing machines designed to be coupled with corresponding counterweights (2) made of non- plastic materials with higher toughness and surface hardness, in view of the insertion and fixing of the columns (10, 10A1 10B, 10C) inside corresponding through housings (20) suitably obtained in the structure of the counterweights
(2).
32) Object made of plastic materials as claimed in the above claim, characterised by the fact that the material with higher toughness and surface hardness used to obtain the counterweights (2) is a concrete mix.
EP08720185.1A 2007-01-16 2008-01-10 System used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness Active EP2104758B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08720185T PL2104758T3 (en) 2007-01-16 2008-01-10 System used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMC20070006 ITMC20070006A1 (en) 2007-01-16 2007-01-16 SYSTEM FOR REALIZING THE STABLE FIXING BETWEEN A BODY IN PLASTIC MATERIAL AND ONE IN A DIFFERENT MATERIAL EQUIPPED WITH MORE TENACITY AND SURFACE HARDNESS.
PCT/IT2008/000015 WO2008087683A2 (en) 2007-01-16 2008-01-10 System used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness

Publications (2)

Publication Number Publication Date
EP2104758A2 true EP2104758A2 (en) 2009-09-30
EP2104758B1 EP2104758B1 (en) 2016-10-26

Family

ID=39636480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08720185.1A Active EP2104758B1 (en) 2007-01-16 2008-01-10 System used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness

Country Status (4)

Country Link
EP (1) EP2104758B1 (en)
IT (1) ITMC20070006A1 (en)
PL (1) PL2104758T3 (en)
WO (1) WO2008087683A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1399845B1 (en) * 2010-05-11 2013-05-09 V I C Viterie Italia Centrale S R L FIXING GROUP OF A COUNTERWEIGHT ON A WASHING MACHINE OR WASHING MACHINE.
TR201819085A2 (en) * 2018-12-11 2020-06-22 Arcelik As A WASHER / DRYER WITH BALANCE WEIGHT

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4238685C2 (en) * 1992-11-17 1995-08-31 Foron Waschgeraete Gmbh Detachable screw connection for fastening ballast masses in drum washing machines
KR20060001241A (en) 2004-06-30 2006-01-06 엘지전자 주식회사 Balance weight in drum washer
ATE544897T1 (en) * 2004-12-15 2012-02-15 Arcelik As WASHER DRYER
DE112006003883B4 (en) 2006-05-02 2013-02-07 Lg Electronics Inc. Tub for a washing machine and washing machine with the tub

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008087683A2 *

Also Published As

Publication number Publication date
PL2104758T3 (en) 2017-04-28
WO2008087683A2 (en) 2008-07-24
WO2008087683A3 (en) 2008-10-02
EP2104758B1 (en) 2016-10-26
ITMC20070006A1 (en) 2008-07-17

Similar Documents

Publication Publication Date Title
KR102109433B1 (en) Tool arrangement
CN101216062B (en) Connecting arrangement with a plastic carrier part and a plastic thread element
KR100804000B1 (en) Tolerance compensating mounting device
TWI498490B (en) Thread locking/prevailing torque fastener and fastener assembly
US8944718B2 (en) Clamping bushing
US7371027B2 (en) Fastening tool and fastening bolt
KR20090005182A (en) Device for fastening an add-on part and a support part at a distance from each other
US4907924A (en) Backward starting locknut
US20090304443A1 (en) Bolt with collar and flexible sleeve insert
EP2104758B1 (en) System used to permanently fix a plastic object to an object made of different material with higher toughness and surface hardness
KR101557922B1 (en) Engagement unit having bolt and nut structure
CA2575565A1 (en) Eccentric screw pump having conical sealing surfaces
CN1113171C (en) Device for locking workpiece on axle article
CA2364380A1 (en) High profile thread forming screw
US6848855B2 (en) Fitting
CN109895423B (en) Semi-finished product for producing a fiber-reinforced composite component, composite component and method for producing a composite component
US6280133B1 (en) Screw including a moldable mass to secure the screw against unintended loosening
KR200387829Y1 (en) Pipe fixing apparatus
US6086201A (en) Spectacle mount with a locking block-screw connection secured against loosening
KR101426748B1 (en) hinge include elastic body
CN114458681B (en) Counter weight unit, locking subassembly and molecular pump
KR970003119Y1 (en) Drum for yarn
JP4138210B2 (en) Joint and pipe connection structure
GB2532799A (en) Improved bicycle crank set
KR101035227B1 (en) The rotating hinge structure

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20090707

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20151211

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20160616

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 840119

Country of ref document: AT

Kind code of ref document: T

Effective date: 20161115

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602008047018

Country of ref document: DE

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20161026

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 840119

Country of ref document: AT

Kind code of ref document: T

Effective date: 20161026

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170127

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170126

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170226

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170227

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602008047018

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170126

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

26N No opposition filed

Effective date: 20170727

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170131

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170131

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170110

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170110

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170110

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20080110

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161026

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161026

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20200129

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SK

Payment date: 20200110

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20200128

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20200327

Year of fee payment: 13

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602008047018

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20210110

REG Reference to a national code

Ref country code: SK

Ref legal event code: MM4A

Ref document number: E 23382

Country of ref document: SK

Effective date: 20210110

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210110

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210110

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210803

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20231215

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20231207

Year of fee payment: 17