A screening arrangement for a window

Abstract

 A screening arrangement (1) for a window, the screening arrangement (1) comprising a bottom element (4), two side rails (1, 2), and a sliding device (6) arranged on one of the two side rails (1, 2) such as to be displaceable in a longitudinal direction of the side rail, the bottom element (4) being movable with respect to the two side rails (1, 2) between a first non-screening position and a second screening position by means of an electrical drive means, the screening arrangement further comprising at least one bottom element positioning device (7, 8, 9, 10, 13a, 13b, 13c, 14, 16, 17) adapted for causing the bottom element (4) to stop when the bottom element (4) and the sliding device (6) are located in a mutually overlapping position.

Description

[0001] The present invention relates to a method for positioning a screening arrangement for a window, preferably a roof window, in a desired position, such as a first non-screening position or a second screening position. The present invention furthermore relates to a screening arrangement for a window, preferably a roof window, the screening arrangement comprising a bottom element being movable between a first non-screening position and a second screening position by means of an electrical drive means.

[0002] EP 0 845 572 A1 describes a device for controlling and actuating a venetian blind in a double-glazing unit of the type constituted by a rectangular frame which supports at least two panes which are mutually parallel and spaced so as to form a chamber isolated from the outside and inside which chamber the venetian blind is accommodated and moved. The venetian blind is moved by means of an electric motor. The device comprises at least one permanent magnet which is arranged on a bottom element of the venetian blind and at least one sensor which is fixed to the frame of the double-glazing unit in a specific position in order to signal that the venetian blind has passed and/or has reached the position of the sensor.

[0003] This arrangement has the drawback that only a very limited number of positions for the venetian blind may be obtained since for each position in which it may be desired to position the venetian blind a sensor must be provided. Thus, in case a high degree of freedom in choice of positions for the screening arrangement is desired a correspondingly high number of sensors would be needed. This has the consequence of leading to high energy consumption as a signal would inevitably be sent to the motor each time a sensor is passed by the magnet arranged on the bottom element. All in all this furthermore makes for a rather complicated construction and expensive solution.

[0004] Another drawback lies in the arrangement of the fixed sensors on the frame of the double-glazing unit which may cause the sensors to form an obstruction or even be subjected to damage during e.g. cleaning of the window, and which is furthermore aesthetically unappealing.

[0005] Therefore, it is the object of the invention to provide a method for positioning a screening arrangement as well as a screening arrangement of the type mentioned in the introduction, which is simple in construction, inexpensive and power saving in use, with which a high degree of freedom in choice of positions for the screening arrangement is obtained, with which no elements are be subjected to damage during e.g. cleaning of the window, and which is furthermore aesthetically appealing. Further it is an object to provide an electric screening which may easily be assembled, fitted and operated by a end user.

[0006] According to a first aspect of the invention, this is obtained by a method of the type described in the introduction, and comprising the steps of:

• providing a screening arrangement comprising a bottom element, two side rails, and a sliding device arranged on one of said two side rails such as to be displaceable in a longitudinal direction of the side rail, the bottom element being movable with respect to the two side rails between a first non-screening position and a second screening position by means of an electrical drive means,
• sliding the sliding device to a desired position on said side rail such as to mark the desired position,
• moving the bottom element to the desired position, and
• stopping the bottom element such that the sliding device and the bottom element are arranged in a mutually overlapping position.

[0007] By providing such a method, and particularly in virtue of the steps of providing a screening arrangement with a sliding device arranged on one of said two side rails such as to be displaceable in a longitudinal direction of the side rail and by manually sliding the sliding device to a desired position on the side rail of the screening arrangement, the bottom element may be moved and stopped in the desired position, which may be any position along the side rails, in a particularly inexpensive and power saving manner. Furthermore such a method provides for a high degree of freedom in choice of positions for the screening arrangement.

[0008] In an embodiment the method further comprises the steps of:

• providing the screening arrangement with at least one bottom element positioning device comprising at least one sensor element,
• sending, by means of the at least one sensor element, a signal to the electrical drive means when the bottom element and the sliding device are reaching a mutually overlapping position, and
• stopping the bottom element in response to the signal.

[0009] Thereby a method is provided with which the screening arrangement may be positioned in any desired position along the longitudinal direction of the side rail in a particularly simple and straight forward manner. Also, only one signal from the sensor element is needed to obtain the desired position, which provides for a very energy efficient method for positioning a screening arrangement. Furthermore this embodiment provides for a method being particularly well suited for being carried out by remote control.

[0010] In an embodiment the method further comprises the step of providing the at least one bottom element positioning device with at least one sliding device component located in connection with the sliding device.

[0011] Such a sliding device component may provide several advantages. When the bottom element positioning device also comprises a sensor element arranged in the bottom element, one may activate the sensor by triggering the issuance of a signal in reaction to the sensor detecting the sliding device component. Thereby a very simple way of stopping the movement of the bottom element is provided for. Alternatively, or in addition thereto, the sliding device component may provide for a particularly simple way of performing a step of mounting the sliding device on the side rail, optionally in a detachable manner.

[0012] In an embodiment the method further comprises the step of providing the at least one bottom element positioning device with at least one bottom element component located in connection with the bottom element.

[0013] In embodiments comprising both the step of providing a bottom element component and the step of providing a sliding device component, the sliding device component may, in a further step, be brought to interact with the at least one bottom element component.

[0014] Thereby another very simple and effective way of stopping the movement of the bottom element is provided for.

[0015] In an embodiment the step of stopping the bottom element comprises bringing the bottom element component and the sliding device component to a position in alignment with each other when the bottom element and the sliding device are located in a mutually overlapping position.

[0016] Thereby a particularly simple way of stopping the movement of the bottom element is provided for which furthermore is functional both with and without the presence of a sensor element and whether remote control actuated or not.

[0017] According to a second aspect of the invention, the above object is obtained by a screening arrangement of the type described in the introduction and comprising a bottom element, two side rails and a sliding device arranged on one of the two side rails such as to be displaceable in a longitudinal direction of the side rail, the bottom element being movable with respect to the two side rails between a first non-screening position and a second screening position by means of an electrical drive means, the screening arrangement further comprising at least one bottom element positioning device adapted for causing the bottom element to stop when the bottom element and the sliding device are located in a mutually overlapping position.

[0018] By providing such a screening arrangement, and particularly in virtue of providing the screening arrangement with side rails and with a sliding device arranged on one of said two side rails such as to be displaceable in a longitudinal direction of the side rail, a screening arrangement is provided with which the bottom element may be moved and stopped in the desired position, which may be any position along the side rails, in a particularly inexpensive and power saving manner. Furthermore a high degree of freedom in choice of positions for the screening arrangement is provided for.

[0019] Additionally such a screening arrangement is particularly simple to both mount and operate and it is furthermore cost-effective to produce as it is very simple in structure and comprises only few components. Furthermore, no elements which may be prone to damage during e.g. cleaning of the window are present, and an aesthetically appealing screening arrangement is provided for.

[0020] In an embodiment the at least one bottom element positioning device comprises at least one sensor element adapted for sending a signal to the electrical drive means when the bottom element and the sliding device are located in a mutually overlapping position such as to cause the bottom element to stop when the bottom element and the sliding device are located in the mutually overlapping position.

[0021] The at least one sensor element may be arranged in any one or more of the bottom element and the sliding device.

[0022] Thereby a screening arrangement is provided which may be positioned in any desired position along the longitudinal direction of the side rail in a particularly simple and straight forward manner. Also, only one signal from the sensor element is needed to obtain the desired position, which provides for a very energy efficient screening arrangement. Furthermore such a screening arrangement is particularly well suited for being remote controlled.

[0023] In an embodiment the at least one bottom element positioning device further comprises at least one sliding device component, such as a magnet, located in connection with the sliding device.

[0024] Such a sliding device component may provide several advantages. When the bottom element positioning device also comprises a sensor element arranged in the bottom element the sliding device component may activate the sensor by triggering the issuance of a signal in reaction to the sensor detecting the sliding device component. Thereby a very simple way of stopping the movement of the bottom element is provided for. Alternatively, or in addition thereto, the sliding device component may provide for a particularly simple way of mounting the sliding device on the side rail, optionally in a detachable manner.

[0025] In an embodiment the at least one bottom element positioning device further comprises at least one bottom element component located in connection with the bottom element.

[0026] In embodiments comprising both a bottom element component and a sliding device component, the sliding device component may be adapted for interacting with the at least one bottom element component.

[0027] Thereby another very simple and effective way of stopping the movement of the bottom element is provided for.

[0028] In an embodiment the bottom element component and the sliding device component are adapted to take up a position in alignment with each other when the bottom element and the sliding device are located in a mutually overlapping position.

[0029] Thereby a screening arrangement with which stopping the movement of the bottom element is provided for in a particularly simple way and which furthermore is functional both with and without the presence of a sensor element. Hence, a screening arrangement with a particularly simple structure is likewise provided for.

[0030] For instance the sliding device component is a magnet and the bottom element component is a metallic element or the sliding device component is a contact element and the bottom element component is a switching device.

[0031] For instance the at least one sensor element may be any one of a position sensor, an inductive sensor, a reed sensor and a Hall sensor.

[0032] In an embodiment the sliding device is arranged detachably on one of the two side rails. This may be obtained e.g. by a magnetic connection or a snap-locking connection.

[0033] Thereby the user may remove the sliding device from the screening arrangement and later reattach it in the same or a different position. Thereby a screening arrangement with more operational possibilities is obtained in that the screening arrangement may be operated in a traditional manual or remote-controlled manner. Especially in case of remote controlled operation, the user may enable the screening device to be operated following a different schedule without interruption caused by the sliding device by detatching the sliding device and then use the remote control to operate the screening arrangement directly or to start a program stored in a memory in the remote control or in the screening device.

[0034] The invention will be described in more detail below by means of a non-limiting example of an embodiment and with reference to the schematic drawings, in which

Fig. 1 shows a screening arrangement according to the invention mounted on the frame of a window.

Fig. 2A shows a perspective view of a screening arrangement according to the invention mounted on the frame of a window and positioned in a first position.

Fig. 2B shows a perspective view of the screening arrangement according to Fig. 2A mounted on the frame of a window and positioned in a second, desired position.

Fig. 3 shows a perspective view of a screening arrangement according to a second embodiment of the invention.

Fig. 4 shows a side view of the screening arrangement according to Fig. 3.

Figs. 5A to 5C show side views of three different embodiments of a screening device according to the invention.

[0035] Figs 2A and 2B show an embodiment of a screening arrangement generally designated 100 in two different positions. The screening arrangement 100 is adapted to be mounted on a frame constituted by a frame 20 representing a window - cf. Fig. 1. The frame 20 is preferably a pivotable frame, but may likewise be a stationary frame, which in a mounted position of the window lines an opening in a building. It is noted that the term "frame" is to be understood as incorporating any substantially rectangular structure positioned in any opening in a building, whether in a wall or the roof, and surrounding an aperture to be screened. The screening arrangement 100 may thus be utilized in connection with e.g. windows having a frame only, windows having a sash and a frame, or in doors.

[0036] As shown in Fig. 1, the frame 20 has a top piece 21, a bottom piece 22 and two side pieces 23 and 24 surrounding an aperture, which is covered by a suitable panel element such as a glazing in the form of an insulating pane (not shown).

[0037] In the embodiment shown, the screening arrangement 100 comprises a top element 3 positioned at the top piece 21, a screening body 5 and a bottom element 4. At its upper end edge, the screening body 5 is accommodated in the top element 3 and its opposed, lower end edge is fastened to the bottom element 4. According to the invention, the bottom element 4 is adapted to be electrically operated during operation of the screening arrangement 1, i.e. when moving the bottom element 4 and hence the screening body 5 between the non-screening position shown in Fig. 1 and a screening position, in which the screening body 5 covers the frame aperture partly or fully. To this end the bottom element comprises an electric motor. The electric motor may in principle and irrespective of the embodiment be arranged anywhere on the screening arrangement, such as particularly in either the bottom element 4 or the top element 3.

[0038] Furthermore, and as shown on Fig. 2a and 2b, the screening arrangement 100 comprises two side rails 1 and 2 adapted to be connected to a respective side piece 23 and 24 of the frame 20 by means of fastening elements, such as screws, and to the top element 4, e.g. by means of a snap or click connection or a plug and socket connection. In the mounted position of the screening arrangement 100, opposite ends of the bottom element 4 and opposite side edges of the screening body 5 are guided in these side rails 1 and 2. In the embodiment shown, the screening arrangement comprises a roller blind having as its screening body 5 a cloth or fabric, and of which the top element 3 includes a spring-biased roller bar. However, other screening arrangements having other kinds of screening bodies and other configurations of the top element are conceivable as well. Hence, it is noted that as used herein the term "screening body" is intended to encompass all feasible types of screening bodies, examples being blinds, pleated blinds, venetian blinds, curtains, insect screens, awnings, roller shutters and shades.

[0039] The screening arrangement 100 further comprises a sliding device 6. The sliding device 6 is arranged on one of the side rails 1, 2 such as to be displaceable in the longitudinal direction thereof, i.e. in a direction between the top element 3 and the end of the side rail 1, 2 opposite to the top element 3. In the embodiments shown the sliding device 6 is arranged on the side rail 2. The sliding device 6 may be continuously or stepwise displaceable in the longitudinal direction of the side rail 2. The sliding device 6 is substantially displaceable along the entire stroke of the screening body in order to define the position between substantially 0-100%. The sliding device 6 is manually displaceble to manually define any arbitary position of the screening.

[0040] The screening arrangement 100 further comprises a bottom element positioning device adapted for causing the bottom element to stop when the bottom element and the sliding device are located in a mutually overlapping position. By mutually overlapping position is understood that the sliding device 6 and the bottom element 4 have reached the same position relative to the side rail 1, 2. There is no physical overlapping required and the sliding device 6 may merly be aligned with the bottom element 4. So the sliding device 6 functions as a guide and sets a target destination and the bottom element will reach said destination when they overlap the position. The bottom element positioning device will be described in detail further below.

[0041] When operating the screening arrangement 100, the user displaces or slides the sliding device 6 from its current or initial position to a desired position 6a illustrated on Fig. 2A by showing the sliding device in dotted lines. Then the bottom element is moved, particularly by activating the electrical drive means, in direction of the arrow shown in Fig. 2B to the desired position 6a in which the sliding device 6 and the bottom element 4 are mutually overlapping. Finally the bottom element 4 is stopped such that the sliding device 6 and the bottom element 4 are arranged in a mutually overlapping position. The screening arrangement 100 is thus positioned in the desired position 6a.

[0042] Turning now to Fig. 3 and 4 a second embodiment of a screening arrangement 101 according to the invention is shown in a perspective view and a side view, respectively. The electrical drive means (not shown) of the screening arrangement 101 is arranged in the bottom element 4.

[0043] The bottom element positioning device of the screening arrangement 101 comprises two sensor elements 7, 9, a bottom element component and a sliding device component. In this embodiment the bottom element component is a metallic element 8 and the sliding device component is a permanent magnet 10. The sensor elements 7, 9 are reed or Hall sensors.

[0044] Thus, when the metallic element 8 and the permanent magnet 10 are sufficiently close to each other, which will be the case the sliding device 6 and the bottom element 4 are mutually overlapping, the permanent magnet 10 will attract the metallic element 8 such as to form a magentic connection. Thus, the metallic element 8 and the permanent magnet 10 are adapted to interact, and particularly to take up a position in alignment with each other, when the bottom element 4 and the sliding device 6 are located in a mutually overlapping position. The result is that in any further movement of the bottom element 4 the sliding device 6 will follow the bottom element 4 due to the magnetic force between the metallic element 8 and the permanent magnet 10. So when the screening is operated by a remote control the sliding device 6 will follow the bottom element 4 and remain aligned. The user may also manually control the screening and release the sliding device 6 from the bottom element 4 by manually sliding it and the manual force overcoming the magnetic force.

[0045] When the permanent magnet 10 is moved past the sensor elements 7, 9 a signal is triggered and sent from the sensor element 7, 9 to the electrical drive means or to a control device (not shown) of the electrical drive means. The signal sent from the sensor element 7, 9 may cause the electrical drive means to reverse its direction of operation to move the bottom element 4 in a direction opposite to the initial direction of movement in case the bottom element 4 has been moved too far, or it may cause the electrical drive means to stop when the desired positon has been reached.

[0046] Generally in all embodiments the at least one sensor element may be configured to register the direction of movement which separated the overlap of the sliding device and bottom element. So the at least one sensor element can register if the sliding device is moved above the bottom element or below the bottom element. This may for example be done by plural sensors (7,9,13a,13b,13c) or by employing a first signal when the sliding device is moved above the bottom element and a second signal when the sliding device is moved below the bottom element. For example some sensors may be direction sensetive.

[0047] It is noted that embodiments in which the two sensor elements 7, 9 has been omitted as well as embodiments in which the bottom element component and/or the sliding device component has been omitted are also feasible.

[0048] In the latter case the two sensor elements 7, 9 may be used to detect whether the desired position 6a has been reached, in one embodiment where both the bottom element component and the sliding device component has been omitted by sensing the presence of the sliding device 6, and in another embodiment where only the bottom element component has been omitted by sensing the presence of the sliding device component.

[0049] In the former case, i.e. where no sensor element is present, the bottom element component and the sliding device component may be used for stopping the movement of the bottom element 4 by means of the physical interaction or connection between the bottom element component and the sliding device component.

[0050] It is furthermore noted, that embodiments in which the bottom element positioning device comprises no sensor or detector are particularly suitable for manually operated screening arrangements, whether in case of the electrical drive means being turned off or malfunctioning.

[0051] Still referring to Fig. 3, the side rail 2 compises a metallic strip 11 and the sliding device 6 is provided with a permanent magent (not shown) such that the sliding device 6 may be mounted on the side rail by a magnetic connection formed between the metal strip 11 and the said permanent magnet. Alternatively, a metallic insert provided in the side rail 2 may be provided. In another alternative the metallic strip or insert may be provided in the sliding device while the side rail 2 may be provided with a permanently magnetic strip or insert. In yet another alternative the sliding device 6 may be mounted on the side rail by means of a snap connection or by means of a guide rail connection, a guide rail being provided on the side rail.

[0052] Turning now to Fig. 5A a third embodiment of a screening arrangement 102 according to the invention is shown in a side view. The electrical drive means (not shown) of the screening arrangement 102 is arranged in the bottom element 4.

[0053] The bottom element positioning device of the screening arrangement 102 comprises a bottom element component and a sliding device component. In this embodiment the bottom element component is a switching element, here in the form of three mechanical switches 13a, 13b, 13c, and the sliding device component is a contact element 14 or alternatively a switch.

[0054] In this embodiment a connection is formed between the switches 13a, 13b, 13c and the contact element 14 as the bottom element 4 moves into the position in which it is mutually overlapping the sliding device 6. The connection formed between the switches 13a, 13b, 13c and the contact element 14 causes the electrical drive means to stop, for instance by simply interrupting the electrical power supply to the electrical drive means or by forming a suitable electrical connection to the electrical drive means or to a control device of the electrical drive means.

[0055] Turning now to Fig. 5B a fourth embodiment of a screening arrangement 103 according to the invention is shown in a side view. This embodiment is particularly suitable for screening arrangements in which the electrical drive means (not shown) is arranged in another part of the screening arrangement 103 than the bottom element 4, for instance in the top element 3.

[0056] The bottom element positioning device of the screening arrangement 103 comprises a sensor element 16 in the form of a position sensor arranged in the sliding device 6. The sensor element 16 measures the position of the sliding device 6 and transmits a signal 18 indicative of the position of the sliding device 6 measured to a control device 15 of the electrical drive means. The control device 15 the controls the electrical drive means and stops the bottom element 4 in response to the signal 18 received, particularly at the position of the sliding device 6 indicated by the signal 18. The signal 18 may be transmitted over a wired connection or wirelessly.

[0057] Finally, with reference to Fig. 5C a fifth embodiment of a screening arrangement 104 according to the invention is shown in a side view. This embodiment is particularly suitable for screening arrangements in which the electrical drive means (not shown) is arranged in another part of the screening arrangement 104 than the bottom element 4, for instance in the top element 3.

[0058] The bottom element positioning device of the screening arrangement 103 comprises a at least one sensor element 17 in the form of a reed or Hall sensor arranged in the bottom element 4 and a sliding device component in the form of a permanent magnet 10. When the permanent magnet 10 and the sensor element 17 are brought sufficiently close to each other during movement of the bottom element 4, the permanent magnet 10 triggers the sensor element 17 to transmit a signal 18 indicating that a position in which the bottom element 4 and the sliding device 6 are mutually overlapping has been reached to a control device 15 of the electrical drive means. The control device 15 then stops the electrical drive means and thus the bottom element 4 in response to the signal 18 received. The signal 18 may be transmitted over a wired connection or wirelessly.

[0059] Furthemore, and irrespective of the embodiment, when operating the screening arrangement by remote control it is well known to encode a predefined or user-defined preferred screening position, e.g. "screenning arrangement 55 % closed", in the remote control. In this case it would be feasible to encode the preferred predefined position in terms of a particular position of the sliding device 6 on the side rail. So the controller stores the last manually defined postion by means of the sliding device 6 and may stop the screening at this stored position when operated by remote control or a program.

[0060] The invention should not be regarded as being limited to the described embodiments. Several modifications and combinations of the different embodiments will be apparent to the person skilled in the art. For example the magnetic coupling between the sliding device 6 and the bottom element 4 may as an anternative be provided by means of a latch or a spring which snaps into a recess. For example the sliding device 6 may be connected to a cord and hereby the sliding device 6 sensors may be placed remote. For example the disclosed screening operation may be combined with further screening limit detection at the top or bottom. For example the sliding device 6 may control the position of multiple screenings so a zone with multiple screenings is linked. Generally in all embodiments the electric drive means may be provided in the bottom element 4 so the electronics are located in the bottom element and enable a reliable and user friendly operation.

Claims

1. A method for positioning a screening arrangement (1) for a window, in a desired position, such as a first non-screening position or a second screening position, the method comprising the steps of:

providing a screening arrangement (1) comprising a bottom element (4), two side rails (1, 2), and a sliding device (6) arranged on one of said two side rails (1, 2) such as to be displaceable in a longitudinal direction of the side rail, the bottom element (4) being movable with respect to the two side rails (1, 2) between a first non-screening position and a second screening position by means of an electrical drive means,

sliding the sliding device (6) to a desired position (6a) on said side rail (1, 2) such as to mark the desired position (6a),

moving the bottom element (4) to the desired position (6a), and

stopping the bottom element such that the sliding device (6) and the bottom element (4) are arranged in a mutually overlapping position.

2. A method according to claim 1, and further comprising the steps of:

providing the screening arrangement (1) with at least one bottom element positioning device comprising at least one sensor element (7, 9),

sending, by means of the at least one sensor element (7,9), a signal to the electrical drive means when the bottom element (4) and the sliding device (6) are reaching a mutually overlapping position, and

stopping the bottom element (4) in response to the signal.

3. A method according to claim 1 or 2, and further comprising the step of providing the at least one bottom element positioning device with at least one sliding device component (10) located in connection with the sliding device (6).

4. A method according to any one of the above claims, and further comprising the step of providing the at least one bottom element positioning device with at least one bottom element component (8) located in connection with the bottom element (4).

5. A method according to claim 3 and 4, wherein the step of stopping the bottom element (4) comprises bringing the bottom element component (8) and the sliding device component (10) to a position in alignment with each other when the bottom element (4) and the sliding device (6) are located in a mutually overlapping position.

6. A screening arrangement (1) for a window, the screening arrangement (1) comprising:

a bottom element (4),

two side rails (1, 2), and

a sliding device (6) arranged on one of the two side rails (1, 2) such as to be displaceable in a longitudinal direction of the side rail,

the bottom element (4) being movable with respect to the two side rails (1, 2) between a first non-screening position and a second screening position by means of an electrical drive means,

the screening arrangement further comprising at least one bottom element positioning device (7, 8, 9, 10, 13a, 13b, 13c, 14, 16, 17) adapted for causing the bottom element (4) to stop when the bottom element (4) and the sliding device (6) are located in a mutually overlapping position.

7. A screening device according to claim 6, wherein the at least one bottom element positioning device comprises at least one sensor element (7, 9) adapted for sending a signal to the electrical drive means when the bottom element (4) and the sliding device (6) are located in a mutually overlapping position such as to cause the bottom element (4) to stop when the bottom element (4) and the sliding device (6) are located in the mutually overlapping position.

8. A screening device according to claim 7, wherein the at least one sensor element (7, 9) is arranged in any one or more of the bottom element (4) and the sliding device (6).

9. A screening device according to any one of claims 6 to 8, wherein the at least one bottom element positioning device further comprises at least one sliding device component (10, 14), such as a magnet, located in connection with the sliding device (6).

10. A screening device according to any one of claims 6 to 9, wherein the at least one bottom element positioning device further comprises at least one bottom element component (8, 13a, 13b, 13c) located in connection with the bottom element (4).

11. A screening device according to claim 9 and 10, wherein the bottom element component and the sliding device component are adapted to take up a position in alignment with each other when the bottom element (4) and the sliding device (6) are located in a mutually overlapping position.

12. A screening device according to claim 11, wherein the sliding device component is a magnet (10) and the bottom element component is a metallic element (8), or wherein
the sliding device component is a contact device (14) and the bottom element component is a switching device (13a, 13b, 13c).

13. A screening device according to any one of claims 6 to 12, wherein the at least one sensor element (7, 9) is any one of a position sensor, an inductive sensor, a reed sensor and a Hall sensor.

14. A screening device according to any one of claims 10 to 13, wherein the at least one bottom element component is located at an end section of the bottom element (4) in proximity to the side rail 1,2.

15. A screening device according to any one of claims 6 to 14, wherein the sliding device (6) is arranged detachably on one of the two side rails (1, 2).

Drawing