EP2921637B1 - Lamella and venetian blind - Google Patents

Description

The invention relates to a blade according to the preamble of claim 1 and a Venetian blind with such slats.

Venetian blinds are a kind of blind, which are not wound on a shaft, but consist of several individual, fixed slats that can be lowered by means of a tape in front of a window or in front of a door. A relevant lamella jalosia is over EP 0 180 550 A2 known. Conventional venetian blinds, which are used as a sunscreen or blackout blinds, have turning tapes, which are attached to the ends of the individual slats to rotate the slats between a horizontal and a vertical position, so that either light between the slats can fall through or the slats darken the building opening as completely as possible. Such venetian blinds are attached to the building exterior of a window frame of a window or door. It is possible to attach a venetian blind made of finer, flexible slats to the inside of the building of a window frame, so that light and sun rays can not penetrate through windows or doors.

In order to raise and lower the individual slats of Venetian blind at least two bands are provided which extend through openings in the slats and are fixed to the bottom slat with their ends. When lifting the slats, the individual slats are stacked on the bottom slat.

There are known Venetian blinds, the fins are formed in cross section S-shaped and thus have a turning point. These slats are also relatively strongly curved. As a result, forms in the closed state, the portion of the slats, which is crossed by the bands, with the bands a relatively obtuse angle. Thus, the bands can extend through small openings in the slats, without exerting a tilting moment on the slats. hereby In the vertical position, the slats can cover a building opening in a light-tight manner.

Such a Venetian blind with S-shaped slats in cross section is from the US 2010/0314053 A1 known.

However, these slats have a strongly curved profile. In modern buildings, especially after the Bauhaus style, but you want to make the surfaces as smooth as possible. With smooth slats, however, there is the problem that the bands must be passed through the individual slats and must be guided at the edges of the slats between them, so that no light-tight termination is possible.

The invention has the object of developing a blade and a venetian blind of the previously known type such that a venetian blind with such vertically arranged slats has a smooth appearance and yet can be closed almost light-tight.

This object is achieved by a blade according to claim 1. Advantageous developments are the subject of the dependent claims.

The slat for a Venetian blind for darkening windows or doors according to the invention has, in a vertical position, a lower edge region and an upper edge region, wherein a main section extends from the lower edge region of the slat in the direction of the upper edge region.

The lamella is characterized in that the main portion has a mean radius of curvature of at least 100 cm, and that the lamella in its upper edge region has a lever portion which extends approximately transversely to a center plane of the remaining portions of the lamella, so that a turning band , which is fastened to an edge formed on the lever portion at a distance from the center plane.

A Venetian blind has several such slats and at least two turning tapes. The turning tapes are attached to each of the slats on two opposite edges of the slat, so that the slats can be turned between a horizontal and a vertical position. In the vertical position of the slats, the venetian blind is in a darkened state, wherein in the horizontal position of the venetian blind prevails a state, the light passes through the venetian blind and allows you to look through a window or a door. The slats have a lower and an upper edge in the vertical position.

The lamellae have a lever portion which is arranged approximately transversely to the center plane of the remaining portions. The center plane is the plane that extends through a pivot point of the sipe such that it extends centrally through all sections except the lever section. By providing the lever portion of the application point of the attacking at the upper edge region of the lamellae turning belt is spaced from the center plane, whereby this turning belt with respect to a. The pivot point about which the respective blade is rotated during turning, even in the vertical position of the slats attacks , As a result, a moment is generated on the slats in their vertical position, which presses the respective slat with the upper edge against the lower edge of the next higher slat. As a result, adjacent lamellae are pressed firmly against each other, whereby a very good darkening is achieved and the closed venetian blind is absolutely opaque.

In a preferred embodiment, the lamellae each have a projection portion and a main portion in addition to the lever portion. The main portion extends from the lower edge portion of the sipe toward the projecting portion. The lever portion generates the closing moment due to its arrangement transverse to the center plane. The projecting portion transmits the closing moment to the main portion of the sipe so as to be able to counteract the opening moment.

The main portion may have an opening through which an elevator belt is passed. Preferably, at least two openings in the lamella and two elevator belts are provided. The elevator belts are attached at one end to a lowermost slat and extend through the openings provided in the other slats.

The Venetian blind can be formed due to the lever portion such that in the vertical position the elevator belts with the openings having portions of the slats take a very small acute angle of, for example, a maximum of 10 ° and preferably not more than 5 °.

Due to the inventive design of the slats, it is possible that the slats in their vertical position with respect to the apertures having sections can take an acute angle with respect to the elevator belts, and still the lamellae are completed substantially light-tight. This acute angle causes an opening moment on the slats, since the elevator belts abut both edges of the openings. With this opening moment, the blade would be rotated from the vertical position a piece in the horizontal position, if not by the lever portion a closing torque would be generated, which compensates the opening moment.

The inventor of the present invention has recognized that by providing the lever portion it is possible to obtain a very acute angle of e.g. not to provide more than 10 ° between the elevator belts and the slats in their vertical position, without affecting the closing function of the slats. Such an acute angle allows the formation of much more planar lamellae than they have been commonly used and yet a substantially light-tight closing the venetian blind.

Instead of the elevator belt, another elevator mechanism, e.g. a V-belt, a toothed belt, a perforated belt or a chain can be provided.

Preferably, the main portion occupies about 60% to 80% of the width of the sipe.

Fig. 1

eine erstes Ausführungsbeispiel einer Lamelle im Querschnitt,

Fig. 2

die Lamelle aus Fig. 1 im Querschnitt zusammen mit einer Mittenlinie,

Fig. 3a - 3d

eine Lamellenjalousie mit der in Fig. 1 gezeigten Lamelle in unterschiedlichen Öffnungszuständen im Querschnitt, wobei zur Vereinfachung der Darstellung nicht alle Abschnitte der Wendebänder gezeichnet sind,

Fig. 4

eine zweites Ausführungsbeispiel einer Lamelle im Querschnitt,

Fig. 5a, 5b

schematisch eine Lamellenjalousie mit einem seitlich an den Lamellen angeordneten Aufzugsmechanismus in einer perspektivischen Ansicht und in einer teilgeschnittenen Seitenansicht.

The invention will be explained in more detail below with reference to the drawings. The drawings show in:

Fig. 1

a first embodiment of a blade in cross section,

Fig. 2

the slat off Fig. 1 in cross section together with a center line,

Fig. 3a - 3d

a venetian blind with the in Fig. 1 shown lamella in different opening states in cross section, not all sections of the turning tapes are drawn to simplify the presentation,

Fig. 4

A second embodiment of a blade in cross section,

Fig. 5a, 5b

schematically a venetian blind with a laterally arranged on the slats elevator mechanism in a perspective view and in a partially sectioned side view.

A first embodiment of a lamella 1 ( Fig. 1 and 2 ) a Venetian blind 2 ( Fig. 3a - 3d ) is in FIG. 1 and 2 shown. The slat 1 is made of a thin Sheet metal formed. In principle, it is also possible to form the lamella from a thin plastic sheet.

The lamella 1 has a lower edge region 3 and an upper edge region 4. A main section 5 of the slat 1 extends from the lower edge region 3 over a majority of the width B of the slat in the direction of the upper edge region 4. In a slatted blind 2, a slat 1 between a horizontal position 6 and a vertical position 7 can be pivoted. In the horizontal position 6, the lamella has an upper side 8 and a lower side 9. In the vertical position, the upper side 8 of the lamella forms an outer side 8 and the underside 9 forms an inner side 9 of the louver 2. Since the present invention is of importance, above all, in the vertical position of the lamellae, these two sides are referred to below as the outer side 8 and Inscribed inside 9. Accordingly, "outside" also means on the outside and "inside" on the inside with respect to the lamellae 1.

The main portion 5 of the blade merges into a projection portion 10 which is bent outwardly from the main portion. The projection portion 10 is substantially smaller than the main portion 5 and forms a small at the upper end portion of the lamella 1 outwardly projecting projection 11 from.

From the upper edge of the projection portion 10, a lever portion 12 extends inwardly. The lever section 12 extends inwardly at least to the extent that it ends within a central plane 13 ( Fig. 2 ).

The center plane 13 of the main section 5 and the projecting section 10 is the plane that extends in the profile of the lamella 1 through the pivoting point 14 of the lamella in such a way ( Fig. 2 ) that the resulting inside surfaces 15 between the center plane 13 and the lamella 1 correspond to the outside resulting surfaces 16 between the center plane 13 and the lamella 1.

The lamella 1 is folded or crimped at its longitudinal edges in each case to a blunt edge 17, 18. In the present embodiment, the edges are rolled and have an approximately circular cross-section.

The lower edge 17 may be provided with a sliding body 25 formed of a non-scratching material, such as a plastic or rubber-like material.

At the edges 17, 18 pairs of opposing hooks 19, 20 are arranged, which serve for attaching turning belts 21, 22. The hooks 19, 20 are attached to edges 17, 18. The lower hooks 19 are fixed to the lower edges at a predetermined angle β, the angle being about 20 ° with respect to a horizontal surface when the blade rests on the horizontal surface. The upper hooks 20 are pivotally attached to the upper edges 18.

Approximately centrally with respect to the width B and offset in the longitudinal direction of the slats 1, at least two passage openings 23 are introduced into the slats 1, through which in each case an elevator belt 24 leads. The elevator belt 24 is fixedly connected at its lower end to a lowermost slat 1. The elevator belts 24 can be synchronously raised or lowered synchronously with an elevator mechanism (not shown), whereby the slats of the blind are stacked or singulated on each other.

The turning tapes 21, 22 can be offset from each other with a known turning mechanism such that the separated lamellae 1 between the horizontal position 6 and the vertical position 7 are pivotable, wherein in the vertical position, the inner turning band 22, with the upper edge region 4 of the blade 1 is connected to the outer turning band 21, which is connected to the lower edge region 3 of the blade 1 is offset approximately by the width B of the blade 1 relative to the horizontal position upwards.

In the vertical position of the slats 1, these lie against the upper edge region 4 with their projection 11 on the elevator belt 24 ( Figure 1-4 ). At the lower edge region 3, the slats 1 lie with their lower blunt edge 17 from the outside on the elevator belt 24. The passage opening 23, through which each one of the elevator belts 24 extends, define the pivot point 14 about which the slats 1 are pivoted between their horizontal position and their vertical position.

Characterized in that the point of attachment of the inner turning belt 22 on the lamellae 1 due to the lever portion 12 from the projection 11 a piece inwardly and within the center plane 13 is arranged causes an upward pull torque of the inner turning belt 22 a torque about the pivot point 14, wherein due to the torque of the projection 11 is pressed against the elevator belt 24. Likewise, due to this torque, the lower edge 17 is pressed against the elevator belt 24 from the outside. The length of the turning tapes 21, 22 between two adjacent slats 1 is slightly smaller than the width B of Slats 1, so that when stretched turning belts 21, 22, the lower edge 17 of a blade 1 is disposed at the same height as the projection 11 of a further arranged below further slat 1. By this torque thus the lower edges 17 of the slats are pressed against the projections 11 of the next lower slats. As a result, the individual slats are pressed together in their vertical position approximately light-tight. Preferably, the projections 11 are formed flattened ( Fig. 3a - 4 ) that they come in approximately planar surface on the elevator belt 24 in abutment. As a result, they offer lower edges 17 of the adjacent lamellae 1 a somewhat vertically extending support surface, so that in the vertical alignment of adjacent lamellae 1 a certain tolerance is given.

The greater the distance d of the upper edge 18 from the center plane 13, the greater the torque. The distance d between the upper edge 18 and the middle plane 13 is preferably at least 2.5% or at least 5% or at least 7.5% or at least 10% or at least 12.5% or at least 15% or at least 20% of the width B. the slat. With this distance, the torque for closing the slats can be adjusted in its vertical position.

In the vertical position of the slats close the elevator belts 24 and the slats 1, in particular the main portion 5 of the slats 1 an angle α ( FIG. 1 ), which is an acute angle. The angle α is in particular less than 30 ° or less than 20 ° or less than 15 ° or less than 10 ° or less than 5 °. Since the passage openings 23 are formed as small as possible, and the thickness of the elevator belt 24 can not be made arbitrarily thin, is in the vertical position of the slats 1 by the stretched elevator belts 24 which abut at the top and bottom of the passage opening 23 with voltage, a Torque exerted, which counteracts the closing torque explained above. However, since the length of the lever portion 12 and thus the distance d of the upper edge 18 can be selected arbitrarily from the center plane 13, the closing torque can be set greater than the opening torque. This ensures that even at an acute angle between the elevator belts 24 and the openings 5 having the openings 23 a reliable approximately light-tight sealing adjacent slats is effected. The opening torque depends on the thickness of the elevator belt 24, the shape of the through holes 23 and the weight on the elevator belt. Depending on these parameters, the distance d of the upper edge 18 from the center plane is selected such that the lamellae terminate in a light-tight manner in their vertical position.

The main section 5 has in the in the Figures 1-3d illustrated embodiment, a small curvature having a radius of curvature which corresponds approximately to ten to thirty times the width B of the lamella. The radius of curvature is at least 100 cm, in particular at least 150 cm and preferably at least 200 cm in the case of a lamella having a width of 7 to 10 cm. The radius of curvature is preferably not greater than 300 cm and in particular not greater than 250 cm. It has been shown that a certain curvature is expedient, since with a completely planar formation of the main section 5 there is a risk that when lifting the slats, the upper slat with the hooks 19 on the underlying slat 1 scratches. In order to avoid such scratching, the hooks are fastened to the lamella 1 at the above-described angle β. However, this angle β can not be made arbitrarily large. Due to the slight curvature of the lamella 1 it is ensured that the respective uppermost lamella 1 is lifted off a stack of lamellae 1 (FIG. FIG. 3a ) comes into contact only with the slider 25 and with the hook 19 with the next lower lamella 1.

In the context of the invention, it is also possible to use a lamella with a precisely planar main section 5 (FIG. FIG. 4 ) train. In such an embodiment, however, it is expedient the hooks 19 (not in FIG. 4 shown) from a non-scratching material, such as plastic form, to produce no scratch marks when lifting the slats. In addition, a small curvature of the main portion 5 increases the rigidity of the fin 1. A material having sufficient inherent rigidity may be formed without such a curvature (radius of curvature is equal to infinity, r = ∞).

The projection portion 10 forming the projection 11 has the purpose that in the vertical position the elevator belts 24 do not abut directly on the outer surface 16 of the blade 1. This prevents that form on the outer surface 16 of the blade 1 difficult to remove strip-like dust deposits.

Furthermore, the lever portion 12 is arranged slightly obliquely with respect to the center plane 13, so that the individual slats 1 can be stacked on one another, wherein a projection of a lower slat in the region of the projection of an upper slat hugs.

The FIGS. 3a to 3d show the lowering of the elevator belts 24, wherein the turning belts 21, 22 are set such that the fins 1, which are separated from the bottom stack of fins, immediately in its vertical position swing. The slats 1 are lifted during an oblique position of the slats (Figure 3d) with its lower edge region 3 from the stack of slats arranged underneath. Here, the uppermost slat slides with its slider 25 on the next lower slat 1 until the slat is completely lifted.

The embodiments explained above each have a projection section 10, which forms an outwardly directed projection 11. In the context of the invention, it is in principle also possible to form the slats without such a projecting portion, but a projection portion is preferred.

In the above-described embodiments, the elevator mechanism is formed by two elevator belts 24 which extend through respective passage openings 23 in the slats 1 and are fixedly connected to the lowermost slat.

In FIG. 5a and 5b is a slatted blind 2 shown schematically simplified, which has a laterally arranged on the slats 1 elevator mechanism 26. The elevator mechanism 26 is arranged on both end faces of the slats 1. The lamellae 1 have on their end sides laterally projecting webs 27, which are arranged approximately centrally with respect to the width of the respective lamellae 1. The elevator mechanism 26 comprises a toothed belt 28, which is guided in a rail 29.

The timing belt 28 can be raised and lowered with a lifting mechanism (not shown). A support plate 30 is disposed below the slats 1. It has about the same width as the slats. It is a rigid sheet metal part made of a metal or plastic sheet. The support plate 30 is connected at the end faces with the toothed belt 28, so that upon movement of the toothed belt 28, the support plate 30 is moved with up or down.

The laterally projecting webs 27 are guided in the rail 29, wherein the slats 1 are basically arranged pivotably about a horizontal axis which extends through the webs 27. When the support plate 30 is lowered, the slats 1 can be swiveled between a horizontal position and a vertical position, as in the embodiments explained above, by means of the turning belts 21, 22. The fins 1 of this embodiment have the same shape as the above-explained fins 1 with the main portion 5, the projection portion 10, the projection 11 and the lever portion 12. In the main section the lamellae have a mean radius of curvature of at least 100 cm. The main portion may also be formed planar.

Instead of the toothed belt, a V-belt, a perforated belt or a chain can be provided. These elements may be formed with a single elongated strand or be formed as an endless belt or endless belt or endless chain.

LIST OF REFERENCE NUMBERS

1

lamella

2

Venetian blind

3

lower edge area

4

upper edge area

5

main section

6

horizontal position

7

vertical position

8th

Outside (top)

9

Inside (bottom)

10

projecting portion

11

head Start

12

lever portion

13

midplane

14

pivot point

15

Surfaces inside

16

Surfaces outside

17

Edge down

18

Edge above

19

Hook down

20

Hook up

21

Turning tape outside

22

Reversible tape inside

23

Through opening

24

Lifting tape

25

sliding

26

winding mechanism

27

web

28

toothed belt

29

rail

30

support plate

Claims (15)

1. Slat for a Venetian blind for darkening windows or doors,
   wherein the slat (1) in a vertical position comprises a lower edge section (3) and an upper edge section (4), wherein a main section (5) extends from the lower edge section (3) of the slat (1) towards the upper edge section,
   wherein
   the main portion (5) has a mean radius of curvature of at least 100 cm, and the slat (1) in its upper edge section (4) has a lever section (12), which extends approximately transversely to a center plane (13) of the other sections (5, 10) of the slat (1), so that a turning belt (22), can be fastened to an edge (18) formed on the lever section (12) at a distance from the centre plane.
2. Slat according to claim 1,
   characterized in that
   the blade (1) adjacent to the lever portion (12) respectively has a projecting section (10) and a main section (5), wherein the main section (5) extends from the lower edge section (3) of the slat (1) in the direction of the projecting section (10) and has openings (23).
3. Slat according to claim 1 or 2,
   characterized in that
   the main section (5) occupies at least about 50%, preferably at least 60% or 70% of the width (B) of the slat (1).
4. Slat according to one of claims 1 to 3,
   characterized in that
   the main section (5) is curved and has an average radius of curvature of at least ten times the width (B) of the slat (1).
5. Slat according to one of claims 1 to 4,
   characterized in that
   the main portion (5) has an average radius of curvature of at least 100 cm, in particular of at least 150 cm and preferably of at least 200 cm.
6. Slat according to one of claims 1 to 5,
   characterized in that the main section (5) has an average radius of curvature of not more than 300 cm, and preferably of not more than 250 cm.
7. Slat according to one of claims 1 to 6,
   characterized in that
   the slat (1) has a width (B) in the range of from 6 cm to 11 cm and especially in the range of from 7 cm to 10 cm.
8. Slat according to one of claims 1 to 7,
   characterized in that
   at the bottom section (3) of the slat (1) at least one sliding body (25) is provided.
9. Slat according to claim 8,
   characterized in that
   the sliding body (25) is formed of plastic, rubber or a rubber-like material.
10. Slat according to one of claims 1 to 9,
    characterized in that
    the slat (1) has hooks (19, 20) for fastening turning belts (21, 22).
11. Slat according to claim 10,
    characterized in that
    the hooks are respectively arranged in opposite pairs on the two opposing edges (17, 18) of the slat, wherein the hooks (19, 20) at the bottom section are fixed with a certain angle (β) with respect to the slat (1).
12. Slat according to claims 10 or 11,
    characterized in that
    the hooks (19, 20) at the lower edge section are formed from a non-abrasive material, such as e.g. a plastic material.
13. Slat according to one of claims 1 to 12,
    characterized in that
    the lever section (12) forms a distance (d) between the upper edge (18) and the center plane (13), wherein this is at least 5% or at least 7.5% or at least 10% or at least 12.5% or at least 15% or at least 20% of the width of the slat.
14. Venetian blind for darkening windows or doors with several slats (1), with an elevation mechanism,
    at least two turning belts (21, 22), which are respectively fastened to all slats at two opposite edges (17, 18) of the slats (1), so that the slats can be turned between a horizontal position and a vertical position, wherein the two edges (17, 18) of the slats (1) in the vertical position of the slats (1) have a lower edge section (3) and an upper edge section (4),
    characterized in that
    the slats (1) are formed according to the slat (1) according to one of claims 1 to 13.
15. Venetian blind according to claim 13,
    characterized in that
    at least two elevation belts (24), which are attached at one end to a bottom slat (1) and which extend through openings (23) provided for in the other the slats, wherein, in the vertical position, the elevation belts (24) form an acute angle (α) with the sections (5) of the slats (1) having openings (23), wherein said acute angle (α) between the elevation belts and the sections of the slats (1) having openings (23), in the vertical position, is preferably less than 30°, in particular smaller than 25° and preferably smaller than 20° and preferably less than 10° and in particular at most 5°.

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