WO2016023876A1

WO2016023876A1 - Laundry drum for a household device having a specific configuration of a driver, and household device for handling items of laundry

Info

Publication number: WO2016023876A1
Application number: PCT/EP2015/068405
Authority: WO
Inventors: Johannes Geyer; Florentin FÖRSCHLER
Original assignee: BSH Hausgeräte GmbH
Priority date: 2014-08-14
Filing date: 2015-08-11
Publication date: 2016-02-18
Also published as: DE102014216228A1

Abstract

The invention relates to a laundry drum (3) for a household device (1) for handling items of laundry, comprising a base (4) and a hollow cylinder-shaped casing (5) attached the the base (4), wherein at least one driver (8, 13, 18) is formed on an inner side (6) of the casing (5), said driver being raised from the inner side (6) into an inner chamber (7) surrounded by the laundry drum (3), wherein the driver (8, 13, 18) has a plurality of at least sickle-shaped driver elements (9, 10, 11) that are arranged concentrically to one another in relation to a driver centre point (12). The invention also relates to a household device (1) having a laundry drum (3).

Description

Laundry drum for a home appliance with specific

Design of a driver and household appliance for the care of laundry

The invention relates to a laundry drum for a household appliance for the care of laundry items, which has a bottom and a subsequent subsequent to the bottom hollow cylindrical shell. On an inner side of the jacket, at least one driver, which rises from the inner side into an inner space surrounding the laundry drum, is formed. Furthermore, the invention relates to a household appliance for the care of laundry with such a laundry drum.

In a washing machine or a washer-dryer, it is customary that a rotatably arranged laundry drum is arranged in a housing. In these, the laundry items can be introduced to clean them. Typically, a plurality of arranged on an inner side of the shell of the laundry drum carrier engage with rotating drum laundry items so that they are co-rotated. For this purpose, usual beam-like carriers are known, as set out, for example, in DE 10 2008 009 141 A1. In addition, in this prior art, in addition to the drivers on the inside of this jacket, a structure is formed, which represent elevations. These elevations are linear and extend from a front edge of the shell to a rear edge of the shell. They are also designed in the form of serpentine lines. These lines, with their orientation relative to a circumferential line, can also be formed as sine waves, zigzag lines or helical lines. By these surveys, the drum shell to be formed as a mechanically rigid structure, but otherwise no additional additional functionality with regard to a targeted laundry action in rotating drum occurs. This is done practically only by the mentioned driver. It is an object of the present invention to provide a laundry drum and a household appliance for the care of laundry items to achieve a gentler entrainment of the laundry items in rotating drum.

This object is achieved by a laundry drum and a household appliance for the care of laundry according to the independent claims.

A laundry drum according to the invention for a domestic appliance for the care of laundry comprises a bottom and a subsequent to the bottom, hollow cylindrical shell. On an inner side of the jacket, at least one driver, which rises from the inside into an interior space surrounded by the laundry drum, is formed. An essential idea of the invention is to be seen in that the driver has a plurality of concentric to a Mitnehmerzentrumspunkt arranged and at least crescent-shaped driver elements. By such a configuration of a driver, the action on the picked up by the driver and taken along pieces of laundry is carried out gently when rotating laundry drum, so that an undesirable impairment of the laundry items during the washing process can be prevented by a driver.

Due to the specific configuration of the driver, which consists of a plurality of driver elements, which are arranged immediately adjacent to each other, the intervention on the laundry items is thus already divided into several driver elements within a very small, localized area. Due to the specific arrangement of the driver elements to each other in this respect also a very uniform shape of the driver elements is achieved. Due to the concentric arrangement of the specifically shaped, namely at least crescent-shaped curved entrainment elements, the gentler engagement and entrainment of the laundry items is still significantly favored. For the circumferential direction thus a shuttle-shaped geometry is thus created quasi by this specific shape of the driver elements, which is formed quasi stepped by the plurality of driver elements, so that the picking up and the entrainment process can be done much gentler.

The specific shape, namely at least a sickle shape, favors the above-mentioned advantages again. In particular, this is also the interlocking and very close arrangement of the driver elements in concentric arrangement favored each other. Due to the design of the driver with the several separate driver elements, these are also viewed in the radial direction to the Mitnehmerzentrumspunkt cascaded to each other. In the direction of rotation about a longitudinal axis of the laundry drum and thus also about a longitudinal axis of the hollow cylindrical shell, these driver elements, arranged at least crescent-shaped, are consecutively and thus cascaded with respect to one another in a very close arrangement and thus very close to one another. Due to the configuration of the driver with the plurality of specifically arranged and shaped driver elements in this regard, a shape of the driver is formed, which corresponds to a starting from the Mitnehmerzentrumspunkt radially propagating transverse wave, the driver elements then form at least each circular segment-shaped wavefronts by their sickle shape. The entire structure of the driver thus corresponds to a transversal wave propagating in this respect, starting from the driver center point, which already has at least two at least circular-arc wavefronts and thus the relevant wave peaks and wave troughs. Preferably, a Mitnehmerelement closer to the Mitnehmerzentrumspunkt is formed with a smaller peak height than a Mitnehmerzentrumspunkt also lying driving element of the driver. As a result of this embodiment, a particularly gentle linting action is achieved when the drum is rotating. Since in this regard virtually all driver elements functionally engage the laundry item and take it along, the mechanical force of the driver on the laundry item is distributed over several areas and thus over a larger area.

Preferably, a Mitnehmerelement closer to the Mitnehmerzentrumspunkt has a smaller element length, which is dimensioned in the circumferential direction about the center point, as a the Mitnehmerzentrumspunkt also lying driving element of the driver. The at least crescent-shaped configurations of the individual driver elements are thus preferably designed in their successive and thus cascaded arrangement such that this element length increases with increasing distance from the Mitnehmerzentrumspunkt is greater. Also, the attacking of the driver is favored with rotating drum to the corresponding items of laundry and a gentler transport of laundry allows.

Preferably, the at least crescent-shaped driver elements are arranged so that a first end of a driver element faces a rear edge of the jacket and a second end of the driver element faces a front edge of the jacket. The driver elements thus extend almost transversely to the direction of rotation about the longitudinal axis of the laundry drum on the inside of the jacket. A particularly uniform absorption of the laundry items with rotating drum is made possible.

It is preferably provided that at least one driver element is designed as a closed ring. In particular, it is provided that when a driver element is sickle-shaped, and the other driver elements have a sickle shape.

If it is provided that a driver element is designed as a circumferential closed ring, then it is preferably provided that the other driver elements of the driver are correspondingly closed rings.

Such a configuration with closed rings creates a symmetrical construction of the driver, whereby in both directions of rotation of the laundry drum an identical functionality of the driver is achieved.

It is preferably provided that a vertex height of a driver element which is dimensioned perpendicular to a longitudinal axis of the laundry drum varies in the direction along the length of the driver element. It is preferably provided that the peak height of the driver element in the middle of its entire element length is greatest and towards the ends, in particular when a sickle shape is present, decreases, in particular decreases continuously. By this embodiment, a maximum peak height is thus achieved in the center, which allows a particularly favorable entrainment of the laundry items when the drum is rotating. In embodiments of drivers in which the driver elements are formed as closed rings, a maximum of the peak height is also formed in the direction between a front edge and a rear edge of the shell seen in the middle of the driver element and it takes to the respective edges of the shell out, and then increase again to the maximum at the second half of the closed ring.

It is preferably provided that the driver has a central driver element, which is designed like a dome, in particular a spherical segment. This is particularly advantageous if the driver elements are designed as circumferential closed rings.

Preferably, in such an embodiment, the Mitnehmerzentrumspunkt the center of the central driver element. An extremely symmetrical design is achieved and allows a very advantageous and gentle entrainment of the laundry items in both directions of rotation of the laundry drum.

It is preferably provided that a driver element in a sectional plane perpendicular to a longitudinal axis of the laundry drum has a waveform or is formed corresponding to a wave crest. By such a cross-sectional shaping also a corresponding corner-free contour curve is created by which also takes a very gentle engagement with the laundry to be taken. It is preferably provided that a driver has at least one outer raised auxiliary element which has a different shape from the other driver elements. By this embodiment, the driving functionality can be further improved. It is preferably provided that, viewed in the direction of rotation about the longitudinal axis of the laundry drum, a driver has on both opposite sides to the other driver elements a plurality of additional elements, in particular in each case two additional elements. In a very advantageous embodiment, it is provided that the respectively at least two additional elements are arranged symmetrically to a plane which is perpendicular to the longitudinal axis of the laundry drum and which has the Mitnehmerzentrumspunkt.

Preferably, it is provided that a plurality of drivers viewed in the direction of rotation about the longitudinal axis of the laundry drum are arranged equidistantly on the inside and are each formed correspondingly with at least two driver elements, which are arranged concentrically around a Mitnehmerzentrumspunkt and at least crescent-shaped.

It is preferably provided that the at least one driver is formed integrated into the jacket, in particular is formed as embossing in the jacket. By such a configuration, a very component-reduced and low-effort assembly is achieved. In addition, undesirable positional tolerances between the driver elements can be avoided.

Preferably, it is also provided that a plurality of through holes are formed at least at a driver element at the apex of the driver element, whereby then a passage of liquid, in particular wash liquor, is possible.

By integrating the driver in the jacket of the laundry drum, in particular by forming an embossing, a wear-poorer design can be achieved, for example, in an embodiment in which the driver elements are formed of plastic and subsequently mounted to the inside of the shell.

Furthermore, the invention also relates to a household appliance for the care of laundry items with a laundry drum according to the invention or an advantageous embodiment thereof. The household appliance may be a washing machine, a washer-dryer or a tumble dryer. Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and feature combinations mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respectively specified combination but also in other combinations or in isolation, without the frame to leave the invention. Thus, embodiments of the invention are to be regarded as encompassed and disclosed, which are not explicitly shown and explained in the figures, however, emerge and can be produced by separated combinations of features from the embodiments explained.

Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:

Fig. 1 is a perspective view of an embodiment of a household appliance according to the invention for the care of laundry items;

FIG. 2 shows a perspective partial view of a laundry drum of the domestic appliance according to FIG. 1; FIG.

3 is an illustration of the detail in FIG. 2 in a perspective sectional view, the sectional plane being perpendicular to a longitudinal axis of the drum;

4 is a perspective view of another embodiment of a laundry drum according to the invention; and

Fig. 5 is an illustration of a partial section of the embodiment in Fig. 4 in an enlarged view.

In the figures, identical or functionally identical elements are provided with the same reference numerals.

In Fig. 1, a household appliance 1 for the care of laundry is shown, which may be a washing machine, a washer-dryer or tumble dryer. The household appliance 1 comprises a housing 2, in which a laundry drum 3 is rotatably arranged. The laundry drum 3 is rotatably mounted in the embodiment about a horizontal axis A.

The laundry drum 3 comprises a bottom 4 and an adjoining hollow cylindrical shell 5. The front side of the laundry drum 3 is open, so that it can be equipped with laundry items on the front. On the housing 2, a door, not shown, is arranged, through which a front-side closing of the loading opening is made possible. In Fig. 2 is a partial section of an embodiment of the laundry drum 3 is shown. By the laundry drum 3, an interior 7 is enclosed, in which these items of laundry can be introduced for care. On an inner side 6 of the shell 5, a plurality of carriers is arranged, in particular three drivers are formed, which are arranged in the direction of rotation about the axis A equidistant from each other.

In Fig. 2, one of these drivers is shown, which is referred to below as a driver 8. In the exemplary embodiment, the driver 8 comprises three separate driver elements 9, 10 and 11. The driver elements 9 to 1 1 are formed sickle-shaped curved in the embodiment and arranged concentrically to each other, this being done with respect to a fictitious Mitnehmerzentrumspunkt 12. These driver elements 9 to 1 1 thus form concentrically around this Mitnehmerzentrumspunkt 12 in its curved, crescent-shaped configuration. They are immediately adjacent and arranged close to each other and thus viewed in the direction of the axis A circumferentially arranged in accordance with cascaded. The entire driver 8 is designed with its driver elements 9 to 1 1 as a wave pattern of a radially extending from the Mitnehmerzentrumspunkt 12 transverse shaft, which is already designed in the embodiment shown with three wavefronts.

As shown schematically in Fig. 1, extend the crescent-shaped driver elements 9 to 1 1 in their shape curves transversely to the direction of rotation about the axis A, so that a first end 1 1 a of the exemplified outer Driver element 1 1 a rear edge 5a of the shell 5 and an opposite second end 1 1 b of the driver element 1 1 a front edge 5b of the shell 5 are facing.

The same is formed for the other driver elements 9 and 10.

As can also be seen, a Mitnehmerelement 9 nearest the Mitnehmerzentrumspunkt 12 has an element length, which measures along the crescent-shaped arc configuration between ends 9a and 9b, which is smaller than an element length of the other, the Mitnehmerzentrumspunkt 12 further lying driver elements 10 and first 1, is. In contrast, in turn, the second closest driver element 10 has an element length dimensioned between ends 10a and 10b which is smaller than an element length of the outer driver element 11. In Fig. 3, the embodiment is shown in Fig. 2, wherein moreover a section in the x-y plane and thus in a sectional plane perpendicular to the axis A is shown.

As can be seen in this illustration, the driver elements 9 to 1 1 in this section each have a contour curve corresponding to a wave crest and thus generally represents a waveform. As can be seen, the driver element 9 has a maximum peak height 9c, which is smaller than a maximum peak height 10c and a maximum peak height 1 1 c of the driver elements 10 and 1 1. In addition, in turn, the apex height 1 1 c of the outer driver element 1 1 greater than the peak height 10c. This means that with increasing distance of a driver element 9 to 1 1 to Mitnehmerzentrumspunkt 12, the peak height increases, in particular, in each case concerns the maximum peak height. In this context, the cutting plane, as shown in Fig. 3, in particular perpendicular to the axis A and the Mitnehmerzentrumspunkt 12 having formed.

As can be seen in Fig. 3, the respective maximum peak height 9c to 1 1 c measured perpendicular to the axis A in said section plane and beyond to a fictitious bottom of the driver elements 9 to 1 1, which then corresponds to the inside 6. In Fig. 4 is a perspective view of another embodiment of a laundry drum according to the invention is shown. Here, by way of example, three separate drivers 8, 13 and 18 are shown, which are the same size and with respect to the number of the respective driver elements and possible additional elements.

Again, the embodiment is explained with reference to the driver 8. In contrast to the embodiment according to FIG. 2 and FIG. 3, it is provided here that the driver elements 10 and 11 are designed as revolving closed rings. The driver element 9 is designed here as a central driver element, which is designed like a dome, in particular designed as a spherical segment. In particular, the Mitnehmerzentrumspunkt 12 is also the center of this driver element. 9

Here too, with regard to the element lengths and the peak heights, the embodiments according to FIGS. 2 and 3 are realized. It can therefore be provided that the respective driver elements 10 and 1 1 at the points at which a sectional plane which is perpendicular to the axis A and the Mitnehmerzentrumspunkt 12 having the respective maximum peak height in this sectional plane and then on both sides thereof in the direction of rotation the ring shape of the driver elements 10 and 1 1 continuously decrease. This can be done to the effect that the driver elements 10 and 1 1 then at the edges 5a and 5b respectively nearest points have the minimum peak height to then rise from da turn and arrive up to the maximum peak height in the intersection of said plane.

However, it can also be provided that when the driver elements 10 and 1 1 viewed in the direction of rotation of their basic shape each considered the peak height is constant and then not varied in the context.

In addition, both in Fig. 4 and in the enlarged view of a partial section of the laundry drum 3 in Fig. 5 can be seen that the driver 8 also has additional elements 14, 15, 16 and 17. These are compared to the Mitnehmerzentrumspunkt 12 even further spaced than the outer driver element 1 1. In addition, four such additional elements 14 to 17 are formed in the embodiment. They are designed to be in the direction of rotation are formed in pairs on opposite sides of the outer driver element 1 1 about the axis A. In addition, they are arranged so that they are symmetrical to a plane which is perpendicular to the axis A and extends beyond the Mitnehmerzentrumspunkt 12, are arranged. The additional elements 14 to 17 are identical in their shape and their dimensions and represent hump-like elements which are respectively tapered to the facing edges 5a and 5b and thus formed in the manner of a horn. Additional elements may also be provided in the embodiment according to FIGS. 2 and 3.

LIST OF REFERENCE NUMBERS

1 home appliance

2 housings

3 laundry drum

4 floor

5 coat

5a rear edge

5b front edge

6 inside

7 interior

8 drivers

9 driver elements

9a end

9b end

9c peak height

10 driver elements

10a end

10b end

10c crown height

1 1 driver elements

1 1 a first end

1 1 b second end

1 1 c peak height

12 Mitnehmerzentrumspunkt 13 drivers

14, 15, 16, 17 additional elements

18 drivers

A axis

Claims

Laundry drum (3) for a household appliance (1) for the care of laundry items, which has a bottom (4) and a hollow cylindrical jacket (5) adjoining the bottom (4), wherein at least one inside (6) of the jacket (5) a driver (8, 13, 18) rising from the inner side (6) into an inner space (7) surrounded by the laundry drum (3) is formed, characterized in that the driver (8, 13, 18) has a plurality of a Mitnehmerzentrumspunkt (12) concentric with each other and at least crescent shaped driver elements (9, 10, 1 1).

Laundry drum (3) according to claim 1, characterized in that a Mitnehmerelementspunkt (12) closer lying driver element (9, 10) has a smaller maximum peak height (9c, 10c) than the Mitnehmerzentrumspunkt (12) further lying driver element (10, 1 1 ) of the driver (8, 13, 18).

Laundry drum (3) according to Claim 1, characterized in that a driver element (9, 10) closer to the driver center point (12) has a smaller element length dimensioned in the direction of rotation about the driver center point (12) than a driver center point (12) Carrier element (10, 1 1) of the driver (8, 12, 13).

Laundry drum (3) according to one of the preceding claims, characterized in that the crescent-shaped driver elements (9, 10, 11) are arranged such that a first end (9a, 10a, 11a) of a driver element (9, 10, 1 1) faces a rear edge (5a) of the jacket (5) and a second end (9b, 10b, 11b) of the driver element (9, 10, 11) faces a front edge (5b) of the jacket (5) is.

5. laundry drum (3) according to one of the preceding claims, characterized in that at least one driver element (9, 10, 1 1) is designed as a closed ring.

6. laundry drum (3) according to any one of the preceding claims, characterized in that a perpendicular to a longitudinal axis (A) of the laundry drum (3) measured vertex height of a driver element (9, 10, 1 1) in the direction along the element length of the driver element (9 , 10, 1 1) varies.

7. laundry drum (3) according to one of the preceding claims, characterized in that the driver (8, 13, 18) has a central driver element (9) which is formed like a dome, in particular a spherical segment.

8. laundry drum (3) according to claim 7, characterized in that the Mitnehmerzentrumspunkt (12) is the center of the central driver element (9).

9. laundry drum (3) according to any one of the preceding claims, characterized in that a driver element (9, 10, 1 1) in a sectional plane perpendicular to a longitudinal axis (A) of the laundry drum (3) has a waveform with a wave crest.

10. laundry drum (3) according to any one of the preceding claims, characterized in that a driver (8, 13, 18) at least one outer raised auxiliary element (14 to 17), which one to the other driver elements (9, 10, 1 1 ) has different shape.

1 1. Laundry drum (3) according to claim 10, characterized in that a driver (8, 13, 18) viewed in the direction of rotation about a longitudinal axis (A) of the laundry drum (3) on both opposite sides to the other driver elements (9, 10, 1 1 ) has a plurality of additional elements (14 to 17), in particular in each case two additional elements (14 to 17). Laundry drum (3) according to claim 1 1, characterized in that each at least two additional elements (14 to 17) are arranged symmetrically to a plane which is perpendicular to a longitudinal axis (A) of the laundry drum (3) and which the Mitnehmerzentrumspunkt ( 12).

Laundry drum (3) according to one of the preceding claims, characterized in that a plurality of drivers (8, 13, 18) viewed in the direction of rotation about a longitudinal axis (A) of the laundry drum (3) are arranged equidistantly on the inside (6).

Laundry drum (3) according to one of the preceding claims, characterized in that the at least one driver (8, 13, 18) in the jacket (5) is integrally formed, in particular as embossing in the jacket (5) is formed.

Domestic appliance (1) for the care of laundry items, comprising a laundry drum (3) according to one of the preceding claims.