EP3348773B1 - Device for opening, closing and locking lamellae of a lamella construction - Google Patents

Description

The invention relates to an arrangement for moving and locking slats of a slat construction, which are used in particular in building installations.

Slat constructions generally have a plurality of rotatably or pivotably mounted slats which can be moved back and forth between a closed and an open state by means of a movement mechanism ( US 2,819,065 A . US 3,430,383 A. ). Depending on the size or function of the slat construction, it may be necessary to lock it in the closed state. This makes it possible, for example, to decouple the movement mechanism and the drive from forces that occur when sealing the lamella construction with sealing elements. With a suitable locking mechanism, it is also possible to protect the slat construction from the direct effects of wind loads or to effectively prevent forced opening from the outside. The JP H08-86 162 A , A violent opening is tested in accordance with DIN EN 1627 from September 2011. Accordingly, burglar-resistant windows are components which, in addition to the usual functional tasks, offer a defined resistance to break-in attempts. Most slat constructions hardly achieve the RC2 classification. In order to successfully survive an RC3 classification, a great deal of effort has to be expended.

For visual reasons and to protect against environmental influences and pollution, the movement mechanism is advantageously arranged within the lamella construction. To do this, it is necessary to keep this entire arrangement for moving and locking slats as compact as possible.

An arrangement for moving within the frame of a lamella construction and provided with a lock is in the patent DE 10 2009 005 594 B4 disclosed. The arrangement for moving consists of several lever arms on both sides of the slats. The lever arms are connected to the slat via two swivel joints and to the frame via two swivel joints. A further swivel joint connects the arrangement for movement with a linearly movable drive element and two of the lever arms. The lengths of the lever arms and the positions of the swivel joints make the slats tilt and open when opening and closing executed. In order to lock the slats in the closed state, one of the lever arms has a hook-shaped end which engages around a bolt fastened to the slat when the slat construction is closed.

The disadvantage of this arrangement for moving is the relatively complex structure with 12 swivel joints per lamella. The more joints such an arrangement has, the higher its maintenance effort.

From the patent GB 1396285 A a manually operated arrangement for moving is known for a lamella construction. The slats each have a short shaft on both sides, through which the axis of rotation of the slats runs.

To open and close the slats, the shafts within the slat construction are rotatably mounted in pivot bearings. In order to couple the rotary movement of the individual lamellae, the end of one of the shafts is connected on one side of the lamellae with two coupling rods that can move in anti-parallel. The coupling rods are movably received on two pins oriented axially parallel to the axis of rotation, which are fastened to the respective shaft on both sides of the axis of rotation. A plate with an elongated perforation is fastened to one of the coupling rods between the pivot bearings of two adjacent slats. On the other coupling rod, an actuating lever that can be pivoted about a pivot point is received with a handle at approximately the same position. On the side of the fulcrum opposite the handle, the actuating lever has a driver which engages in the slot-shaped opening in the plate. The driver is a roller rotatably mounted on a pin. When the actuating lever pivots, the coupling rods are moved antiparallel over the bearing of the actuating lever and over the driver guided inside the opening. The movement is transmitted to the shafts by means of the pins, whereby all the slats connected to the coupling rods are moved around the axes of rotation.

In order to lock the slats in the closed state, the otherwise linear slot-shaped opening has an angled end. When the slat construction is closed, the driver of the actuating lever is located there. To lock the angled end and the driver is positioned to the fulcrum of the operating lever that the Before reaching the angled end, the driver must exceed a reversal point, behind which the actuating lever is held in the locked position by a force emanating from the slats. The reversal point is where the driver crosses an imaginary connecting line to the fulcrum of the actuating lever that is oriented perpendicular to the movement vector of the coupling rods. The force emanating from the slats is obviously achieved here by the counterpressure of the elastic sealing elements to which the slats are applied in the closed state. The reversal point can only be overcome by the swiveling movement of the operating lever, which means that the slat construction cannot be opened from the outside. Locking would also work with a linear breakthrough without the angled end. With the angled end, however, the travel of the actuating lever required to assume the locked position can be shortened. The disadvantage is that after the reversal point is exceeded, the force acting on the sealing elements in the closed state decreases again, which can have a disadvantageous effect on the sealing of the lamella construction.

Depending on the size of the lamella construction, it may also be disadvantageous that only one arrangement for moving is present for locking the lamellae coupled via the coupling rods. Sealing the entire lamella construction with the elastic sealing elements requires a certain contact pressure. A resulting resistance to movement can cause a very high mechanical stress for the individual arrangement.

With the implemented principle of the arrangement for moving, 5 swivel joints are required to transmit the rotary movement per slat, whereby higher tolerances are to be assumed on the movable connection between the coupling rods and the pins, which additionally complicate a secure sealing of the slat construction.

The invention has for its object to provide a possibility for an arrangement for moving and locking a lamella construction, which is low in maintenance and consists of as few, simply constructed individual parts.

Another object of the invention is to achieve an RC3 classification according to DIN EN 1627 from September 2011.

The object is achieved by an arrangement for opening, closing and locking slats of a slat construction containing at least one circumferentially framed slat, a circumferential window frame profile, an opening unit, at least one coupling rod, at least one driving pin holder, at least one lever arm, at least one cam plate and at least one latch , Each slat is connected laterally to the frame profile via a pivot bearing with an axis of rotation. At least one rotary bearing of each lamella has a shaft which has a first end face facing the lamella, which is provided with a connecting piece for receiving the lamella, and a second end face. The respective other pivot bearing of a lamella is a drive-less pivot bearing if there is only one coupling rod. If a coupling rod is provided on both sides of the lamella, the arrangement is constructed mirror-symmetrically. The opening unit consists of a linear drive, either one or two tie rods and one or two corner drives, the linear drive can be arranged at the bottom or top of the horizontally extending part of the frame profile. If there are two tie rods, the force is applied to both tie rods at the same time, which then always move in opposite directions. For this purpose, a motor lever is mounted on each tie rod. The horizontal movements of the tie rods are redirected in the corners of the frame via corner deflection into vertical movements of the coupling rods arranged vertically on the side. A driver pin holder with a driver pin and a lever arm are assigned to each non-drive-free rotary bearing. The lever arm is rotatably connected to the second end face of the shaft with a fixed end. In the lever arm there is an angled elongated hole, which can be subdivided into a first leg oriented radially to the axis of rotation, an apex and a second leg at a first angle α, the driving pin holder being firmly connected to the coupling rod and the driving pin protruding into the elongated hole. Thus, the linear movement of the coupling rod between the upper and lower end position on the driver pin holder, driver pin, lever arm and pivot bearing in a rotary movement of the slat between a closed position and changed to an open position. According to the invention, when the lamella is closed, the second leg is aligned parallel to the coupling rod, as long as the driver pin is guided in the second leg between the upper end position and the apex. This also means that the driver pin does not initiate any rotational movement on the lamella over the path length between the upper end position and the apex. This idling is used to provide locking of at least one slat either on one side or on both sides. Each lock is constructed identically in that a cam plate is firmly connected to the coupling rod in a free area. This is preferably done to the left and / or right above or below the driven swivel joint of the corresponding lamella. A groove has been worked into each cam plate, which is divided into two areas, a first area parallel to the coupling rod and the subsequent second area running at a second angle β in the direction of the lamella. A pawl is assigned to each cam plate, the pawl being arranged non-rotatably on the frame profile. The pawl also has a guide pin which is arranged projecting into the groove of the cam plate. The pawl protrudes into a recess made in the frame and the adjoining lamella in the event that the coupling rod has assumed the upper end position. In this end position of the coupling rod, the guide pin is at the end of the second area of the groove and all the driver pins are in the end area of the second leg. At the same time, the slats have taken the closed position. In the event that the coupling rod is now moved from the upper end position to the lower end position, the guide pin is moved away from the lamella by the second area of the groove at an angle, so that the pawl is thus guided out of the recess. The pawl is completely led out of the lamella when the guide pin has left the second area of the groove and has been transferred into the first area of the groove. At the same time, the driver pin is still in the second leg or just at the apex of the elongated hole.
The main advantage of the arrangement according to the invention is that firstly the slats are locked in all positions by the self-locking of the electromechanical drive, secondly when the slats are in a vertical position (closed position) there is an additional self-locking between the driving pin holder and lever arm and thirdly swivels out of the frame the latch into the closed slat and locks it so that it cannot be opened from the outside without being destroyed. An arrangement according to the invention allows an RC3 classification.
Advantageous refinements result from the dependent claims.

Fig. 1

schematische Darstellung einer erfindungsgemäßen Anordnung mit seinen wesentlichen Elementen,

Fig. 2

einen Teil eines prinzipiellen Aufbaus einer Anordnung zum Öffnen und Schließen von einer Lamelle,

Fig. 3

einen Teil eines prinzipiellen Aufbaus der Anordnung in einer anderen Ansicht,

Fig. 4

einen prinzipiellen Aufbau der Anordnung zum Verriegeln einer Lamelle im verriegelten Zustand,

Fig. 5

einen prinzipiellen Aufbau der Anordnung zum Verriegeln einer Lamelle im entriegelten Zustand,

Fig. 6a

eine Prinzipdarstellung für den Zustand Verriegelt und Lamelle geschlossen,

Fig. 6b

eine Prinzipdarstellung für den Zustand Entriegelt, aber Lamelle noch geschlossen und

Fig. 6c

eine Prinzipdarstellung für den Zustand Entriegelt und Lamelle geöffnet.

The invention will be explained in more detail below using exemplary embodiments. In the accompanying drawings:

Fig. 1

schematic representation of an arrangement according to the invention with its essential elements,

Fig. 2

part of a basic structure of an arrangement for opening and closing a slat,

Fig. 3

a part of a basic structure of the arrangement in a different view,

Fig. 4

a basic structure of the arrangement for locking a slat in the locked state,

Fig. 5

a basic structure of the arrangement for locking a slat in the unlocked state,

Fig. 6a

a schematic diagram for the locked state and slat closed,

Fig. 6b

a schematic diagram for the unlocked state, but slat still closed and

Fig. 6c

a schematic diagram for the unlocked state and opened slat.

The essential elements, see Fig. 1 , A slat construction according to the invention are a frame profile 1, slats 2 arranged therein, which are rotatably connected to the frame profile 1 by two pivot bearings 3, a linear drive 4, which has tie rods 5 and corner deflections 6 arranged horizontally on both sides, the coupling rods 7 arranged on the left and right sides can move linearly between an upper end position O and a lower end position U, driver pin holder 8, lever arms 9, a cam plate 10 and a pawl 11.

Based on Fig. 2 the mechanism for opening and closing a slat 2 will be described below. The pivot bearing 3 with its axis of rotation 12 has the shape of a cylindrical sleeve which is fixedly connected to the frame profile 1.

In the rotary bearing 3, a shaft 13 is received, which is rotatably supported about the axis of rotation 12. The shaft 13 has a first end face 14 and a second end face 15. The first end face 14, according to Fig. 3 , is facing a lamella 2, on which a connector 16 is rotatably arranged. The connecting piece 16 is a cuboid body, with which a positive and non-positive connection to the lamella 2 can be established. The second end face 15 of the shaft 13 has a coaxially arranged profile extension 17 for establishing a positive and non-positive connection to the lever arm 9.

The lever arm 9 consists of a strip-shaped flat material with a fixed end 18 and a loose end 19. With the fixed end 18, the lever arm 9 lies flat against the second end face 15 and is non-rotatably connected to the shaft 13 via a positive connection to the profile extension 17 connected.

The lever arm 9 has an angled elongated hole 20 with a constant width b. The elongated hole 20 can first be divided into a first leg 21 and a straight second leg 22, the vertex S being between them. The included first angle α is 135 °. The according Fig. 2 The angled extension 23 shown is optional, but definitely advantageous, which is explained in more detail below. The first leg 21 pointing from the apex S to the fixed end 18 is arranged in the radial direction to the axis of rotation 12.

Engaging in the elongated hole 20, a cylindrical driver pin 24 is arranged axially parallel to the axis of rotation 12. It has a slightly smaller diameter than the width b of the elongated hole 20, so that it can be moved with little play.

The driver pin 24 is fixedly connected to a driver pin holder 8. The driver pin holder 8 is a body that is adjustably attached to a coupling rod 7.

The coupling rod 7 is arranged with its axis along the frame profile 1, orthogonal to the axis of rotation 12 and with an axial distance from the axis of rotation 12. The Coupling rod 7 has a circular cross section and is linearly movable in two sliding bearings 25 along its axis. The slide bearings 25 are arranged along the coupling rod 7, symmetrically on both sides of the pivot bearing 3 and are firmly connected to the frame profile 1.

The driving pin holder 8, which carries the driving pin 24, is received on the coupling rod 7 between the sliding bearings 25. For this purpose, the driver pin holder 8 has a through hole with which it is pushed onto the coupling rod 7. The attachment of the driver pin holder 8 to the coupling rod 7 is detachable and is carried out by means of threaded pins 26 screwed in radially to the coupling rod 7.

In order to carry out a controlled movement of the lamella 2 between an open and a closed and locked state, the coupling rod 7 is connected to the linear drive 4 via corner deflection 6 and pull rod 5. Suitable linear drives 4 are known from the prior art and are not described further here. With the linear drive 4, the coupling rod 7 is linearly displaced in the slide bearings 25.

Fig. 4 and Fig. 5 show an enlarged section of the locking mechanism. On the upper end of the coupling rod 7, as already in Fig. 1 indicated, a curve plate 10 is attached. The cam plate 10 is also fastened to the coupling rod 7 like the driver pin holder 8, the fastening being releasable and done by means of threaded pins 26 screwed in radially to the coupling rod 7. A groove 28 has been worked into the cam plate 10 and is divided into two areas, a first area 29 parallel to the coupling rod 7 and the adjoining second area 30 at a second angle β ( Fig. 5 ) runs in the direction of lamella 2. The pawl 11 is assigned to the cam plate 10, the pawl 11 being arranged on the window frame profile 1 in a rotationally fixed manner by means of a connection 31. The pawl 11 also has a guide pin 32 which is arranged projecting into the groove 28 of the cam plate 10. The pawl 11 protrudes accordingly Fig. 4 through an opening 33 made in the frame profile 1 into a recess 27 made in the adjacent framed lamella 2. Fig. 2 and Fig. 4 show the state of the closed and locked slat 2 by the coupling rod 7 is in the upper end position O. According to Fig. 2 It is clear that the coupling rod 7 has a slight path over the upper end position O can be performed. As a result, the driver pin 24 is guided into the angled extension 23, as a result of which the lamella 2 is pressed and firmly closed.

Taking into account the forces required to move the lamella 2 and the requirement to be able to integrate the arrangement into the frame profile 1 in a space-saving manner, the axial distance between the axis of rotation 12 and the coupling rod 7 and thus also the lever arm 9 is kept as short as possible. In the closed state, the lever arm 9 takes up an angle of approximately 45 ° to the imaginary horizontal H.

The first angle α and a radius r of the vertex S to the axis of rotation 12 are coordinated. In the embodiment shown in the figures, the value of the radius r = 45 mm and that of the first angle α = 135 °. In the size range of the first angle α from> 90 ° to <180 °, other values for the radius r and the first angle α are also possible, with only a first angle α in the size range being given the aforementioned specifications and usual opening angles of slats 2 of a slat construction between 120 ° and 150 ° makes sense. The values for the first angle α are always to be selected such that the second leg 22 runs parallel to the coupling rod 7 in the closed state. As a result of this course, the lamella 2 is already locked against opening from the outside, since the coupling rod 7 is decoupled from forces (torques about the axis of rotation 12). The decoupling of the coupling rod 7 is achieved because the driver pin holder 8 for driving the lamella 2 is positively connected to the frame profile 1, but can execute the direction of movement of the coupling rod 7.

In an attempt to twist the lamella 2 by an external force, the force is transmitted from the shaft 13 via the lever arm 9 to the driver pin 24. A moment acting on the driver pin 24 is oriented almost orthogonally to the course of the coupling rod 7 due to the orientation of the second leg 22. The force introduced is transmitted radially to the slide bearing 25 via the driving pin holder 8 and the coupling rod 7 and is diverted into the frame profile 1. A portion of the force acting on the coupling rod 7 in the axial direction is, if any, vanishingly low, so that any force acting on the lamella 2 from the outside cannot be converted into a directed force in the direction of movement of the coupling rod 7. Therefore, the linear drive 4 connected to the coupling rod 7 does not require high holding forces and can accordingly be designed to be small and cost-saving. It also blocks how out Fig. 4 can be seen, the pawl 11 opening.

Based on Figures 6a to 6c the sequence is to be explained how the closed and locked slat 2 is unlocked and opened. According to Fig. 6a the coupling rod 7 has assumed the upper end position O. For a better view of the process, the decisive components were not superimposed as real, but then rotated 90 ° relative to each other with respect to the coupling rod 7 on which they are fastened, but were shown side by side. The illustrations are therefore one and the same coupling rod 7, only the illustration on the right rotated horizontally by 90 °.

During the controlled movement to open the lamella 2, the coupling rod 7 is moved downward from the upper end position O by the linear drive 4. Following the coupling rod 7, the driver pin 24 within the second leg 22 of the elongated hole 20 and the guide pin 32 in the second region 30 of the groove 28 are simultaneously shifted downward by the path length c, which in this embodiment has a value of 12 mm. Since the second leg 22 runs parallel to the coupling rod 7, the displacement of the driver pin 24 within the second leg 22 initially does not cause any movement of the lever arm 9 and thus also no movement of the lamella 2. This is also important in this respect because the path length c from the upper end position O the pawl 11 still protrudes into the recess 27 of the slat 2 and thus rotation of the slat 2 is prevented. Only when the guide pin 32 leaves the second area 30 and dips into the first area 29 of the groove 28, see Fig. 6b , the pawl 11 has thereby been brought out of the recess 27 so that the lamella 2 is no longer locked. If the displacement of the coupling rod 7 is continued, the guide pin 32 is guided into the first region 29 of the groove 28 and since the first region 29 runs parallel to the coupling rod 7, the pawl 11 does not change its position during a further displacement of the coupling rod 7 in the direction of the lower end position U. more. In contrast, the driver pin 24 dips into the elongated hole 20 in the first leg 21 and presses the lever arm 9 in the direction of the lower end position U, see Fig. 6c , whereby the shaft 13 is rotated about the axis of rotation 12 and thus the lamella 2 opens.

The controlled movement of the lamella 2 can be continued up to a lower end position U of the coupling rod 7. In the lower end position U, the slat 2 is in the fully open state. The positions of the upper end position O and lower end position U depend on the desired positions of the lamella 2 in the open and closed state and are determined by the configuration of the linear drive 4.

It is possible that the driver pin 24 passes the imaginary horizontal H to reach the lower end position U. When passing the horizontal line H, the driver pin 24 approaches tangentially to the axis of rotation 12. A distance a existing between the axis of rotation 12 and the end of the first leg 21 is therefore always chosen such that the first leg 21 does not limit the tangential approach.

It should be clarified here that in the case of a lamella construction with a plurality of lamellae 2, each lamella 2 with only one lever arm 9, one driver pin holder 8 and driver pin 24 is connected to the coupling rod 7. A plurality of slide bearings 25 are provided for the linearly movable mounting of the coupling rod 7. The number of slide bearings 25 corresponds at least to the number of plates 2, the slide bearings 25 being arranged symmetrically between the pivot bearings 3 of the plates 2. All slats 2 of the slat construction are moved together by the driven coupling rod 7.

A further embodiment for a lamella construction with a plurality of lamellae 2 is that each lamella 2 on each side with an arrangement for moving and locking according to the Figures 6a to 6c is provided. The two coupling rods 7 are then deflected in the lower or upper area of the lamella construction and moved via the only horizontally arranged linear drive 4.

In the case of a lamella construction with a plurality of lamellae 2, the advantages of the releasable fastening of the driver pin holder 8 and the cam plate 10 to the coupling rod 7 come into play, by means of which an independent adjustment of the individual lamellae 2 is ensured.

Further configurations result from the fact that each lamella 2 can be equipped with two pawls 11 so that it can be locked. For reasons of stability, it may be advantageous to provide two coupling rods 7 instead of only one coupling rod 7, which are then connected to one another in the same direction.

LIST OF REFERENCE NUMBERS

1

Frame profile

2

lamella

3

pivot bearing

4

linear actuator

5

pull bar

6

Corner transmission

7

coupling rod

8th

Mitnehmerzapfenhalter

9

lever arm

10

cam plate

11

pawl

12

axis of rotation

13

wave

14

first face

15

second face

16

connector

17

Profile extension

18

firm end

19

loose end

20

Long hole

21

first leg

22

second leg

23

angled extension

24

driver pin

25

bearings

26

Set screw

27

recess

28

groove

29

first area

30

second area

31

connection

32

spigot

33

breakthrough

H

horizontal

O

upper end position

S

vertex

U

lower end position

α

first angle

β

second angle

a

Distance between axis of rotation 12 and first leg 21

b

width

c

path length

r

Radius of the vertex to the axis of rotation 12

Claims (10)

1. A device for opening, closing and locking lamellae (2) of a lamellar construction comprising
   at least one circumferentially framed lamella (2), a circumferential blind frame profile (1), an opening unit, at least one coupling rod (7), at least one driver pin holder (8), at least one lever arm (9), at least one cam plate (10) and at least one latch (11), wherein

   - the at least one circumferentially framed lamella (2) is arranged so as to be laterally connected to the blind frame profile (1) in each case via a rotary bearing (3) with an axis of rotation (12), wherein

   - at least one of the rotary bearings (3) has a shaft (13) with a first end face (14), which faces the lamella (2) and is provided with a connector (16) for receiving the lamella (2), and a second end face (15),

   - the opening unit comprises a linear drive (4), at least one pull rod (5) and at least one corner bend (6), the linear drive (4) being arranged at the bottom or top of the horizontally extending part of the blind frame profile (1) and a force being introduced onto the at least one pull rod (5) and each pull rod (5) being connected in each case via a corner bend (6) to at least one coupling rod (7) arranged vertically laterally in the blind frame profile (1),

   - each shaft (13) is assigned a driver pin holder (8) with a driver pin (24) and a lever arm (9), wherein

   - the lever arm (9) has a fixed end (18) non-rotatably arranged on the second end face (15) of the shaft (13) and has an angled elongated hole (20) which can be subdivided into a first arm (21) aligned radially with respect to the axis of rotation (12), a vertex (S) and a second arm (22) at a first angle (α),

   - the driver pin holder (8) has a fixed connection to the coupling rod (7) and the driver pin (24) is arranged so as to project into the elongated hole (20), so that the linear movement of the coupling rod (7) between an upper end position (O) and a lower end position (U) can be converted into a rotary movement of the lamella (2) between a closed position and an open position via the driver pin holder (8), driver pin (24), lever arm (9) and shaft (13), and

   - the second arm (22) is aligned parallel to the coupling rod (7) when the driver pin (24) is guided in the second arm (22) between the upper end position (O) and the vertex (S),

   - each cam plate (10) has a fixed connection to one of the coupling rods (7) and in each cam plate (10) there is a groove (28) which is divided into two regions, a first region (29) being arranged parallel to the coupling rod (7) and the adjoining second region (30) being arranged at a second angle (β) in the direction of the lamella (2), wherein

   - a latch (11) is assigned to each cam plate (10), wherein

   - the latch (11) is arranged non-rotatably on the blind frame profile (1),

   - the latch (11) has a guide pin (32) which is arranged projecting into the groove (28) of the cam plate (10), and

   - an opening (33) is provided in the blind frame profile (1), and in the adjacent framed lamella (2) there is a recess (27)

   - into which the latch (11) projects when the upper end position (O) is set, the guide pin (32) simultaneously being arranged at the end of the second region (30) of the groove (28) and all driver pins (24) being arranged in the end region of the second arms (22) as soon as the lamellae (2) have assumed the closed position, or

   - from which the latch (11) projects when the guide pin (32) is in the first region (29) of the groove (28),

   - the guide pin (32) is in the second region (30) of the groove (28) only if the driver pin (24) is in the second arm (22) and the lamella (2) is in the closed position.
2. The device according to claim 1, characterised in that a box-shaped insert is arranged in the recess (27) of the framed lamella (2).
3. The device according to claim 1 or 2, characterised in that the first angle (α) has a value of 135°.
4. The device according to claims 1 to 3, characterised in that the second angle (β) has a value in a range greater than 90° and smaller than 180°, preferably a value of 135°.
5. The device according to claims 1 to 4, characterised in that a radius (r) between the vertex (S) and the axis of rotation (12) is greater than a minimum distance (a) between the driver pin (24) and the axis of rotation (12).
6. The device according to claims 1 to 5, characterised in that the driver pin holder (8) is arranged in a form-locking manner in the blind frame profile (1).
7. The device according to claims 1 to 6, characterised in that sliding bearings (25) for linear guidance of the coupling rod (7) are each arranged symmetrically with respect to the rotary bearings (3).
8. The device according to claims 1 to 7, characterised in that, in a lamellar construction having a plurality of lamellae (2), each lamella (2) is arranged in connection with a coupling rod (7) both on the left and on the right, in each case via a lever arm (9) and a driver pin (24).
9. The device according to claims 1 to 8, characterised in that two coupling rods (7) connected to each other are arranged on both sides of the blind frame profile (1) for stability reasons, which coupling rods (7) can both be moved simultaneously between their end positions (O and U) via the one linear drive (4).
10. The device according to claims 1 to 9, characterized in that the second arm (22) of the elongated hole (20) has an angled extension (23) of the elongated hole (20) in the end region, as a result of which a pressure force can be produced on the lamella (2) after assuming the closed position.

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