EP3959410A1

EP3959410A1 - A screening arrangement with a shielding device

Info

Publication number: EP3959410A1
Application number: EP20817216.3A
Authority: EP
Inventors: Henning Ebbesen
Original assignee: VKR Holding AS
Current assignee: VKR Holding AS
Priority date: 2019-11-25
Filing date: 2020-11-24
Publication date: 2022-03-02
Also published as: WO2021104595A1

Abstract

A screening arrangement (1) for a roof window (2). The screening arrangement (1) comprising a screening body (11), a top casing (23), a roller shaft (14) accommodated in the top casing (23), a winding device comprising at least one winding reel (16) in connection with the roller shaft (14), a bottom profile (15), side rails (21, 22), a cord system including at least one guidance cord (12), at least one return element (10) for the at least one guidance cord (12), a tensioning device (13) accommodated in the bottom profile (15) and comprising at least one spring device (131) for tensioning the at least one guidance cord (12) with a spring bias. The bottom profile (15) further comprises a shielding device (17) extending longitudinally between a first end (171) and a second end (172), and that the tensioning device (13) is at least partly accommodated within the shielding device (17) between the first end (171) and the second end (172).

Description

Title of Invention

A screening arrangement with a shielding device

Technical Field The present invention relates to a screening arrangement according to the preamble of claim 1. The invention furthermore relates to a method for manufacturing such a screening arrangement.

Background Art Screening arrangements positioned in front of windows to cover the window from direct sunlight in the screening position are common. Usually such a screening arrangement further serves to give privacy and security against burglary. The usual screening arrangement comprises a screening, typically in the form of a blind or shade, such as a roller blind or a pleated blind, or an awning or a roller shutter. Such screening arrangements for roof windows are generally electrically controlled, as their position are often out of reach for a user. Being out of reach for manual handling poses constraints on how a screening arrangement can be arranged. Normally, control of screening arrangements for roof windows is limited to up and down motion of the blind or shade.

As the bottom profile connected to the second end portion of the screening body must retain its substantially parallel position to the top casing during operation, a parallel guidance system is included in such screening arrangement. Typically, this involves a cord system connected to a tensioning device accommodated in the bottom profile. As the demands to flawless operation during the expected lifetime of the tensioning device are high, the parts of the tensioning device are necessarily made from sturdy and robust materials. In view of a general consumer’s wish to have as slender parts as possible, the space available in the bottom profile is limited, and consequently, the components of the tensioning device are packed relatively closely together. This may lead to undesirable chafing and ensuing noise when the parts of the tensioning device move during its travel to tighten any slack of the guidance cords of the cord system.

Summary of Invention

With this background, it is therefore an object of the invention to provide a screening arrangement, by which it is possible to ensure correct functioning of the screening arrangement while at the same time being cost- effective to manufacture.

This and further objects are achieved by a screening arrangement of the kind mentioned in the introduction, which is furthermore characterised in that the bottom profile further comprises a shielding device extending longitudinally between a first end and a second end, and that the tensioning device is at least partly accommodated within the shielding device between the first end and the second end.

The shielding device acts as a dampening element or silencer of the tensioning device relative to the bottom profile.

Having the tensioning device at least partly accommodated within the shielding device assures noises generated by the tensioning device chafing against the bottom profile are lessened. Furthermore, the shielding device may serve to protect the tensioning to extend the life time of the tensioning device. The external screening arrangement may be an external flat roof window screening arrangement and/or an external inclined roof window screening arrangement. The external screening arrangement may preferably be configured for being mounted on a roof window in an inclined roof and/or a flat roof. In an embodiment the external screening arrangement is in a mounted condition mounted on a roof window, wherein said roof window is mounted in an inclined roof or a flat roof.

While in principle, the shielding device may be in any form it is presently preferred that the shielding device has a substantially rectangular, preferably substantially square, cross-section, comprising a first longitudinal side and an opposite second longitudinal side as well as opposite third and fourth longitudinal sides each first to fourth longitudinal extending in-between the first end and the second end of the shielding device, and wherein the second longitudinal side comprises a slot, the slot extending throughout the length of the second longitudinal side. A rectangular shape is simple to produce, and easy to accommodate within the bottom profile.

In a development of the above-mentioned presently preferred embodiment, the first longitudinal side comprises one or more hinges, and wherein the one or more hinges and the slot allows for the shielding device to be opened and closed, the shielding device being preferably symmetrical along an axis extending through said one or more hinges.

Being able to open and close and the shielding device, allows for it to be replaced damaged, or even retrofitted on other external screening assemblies.

In a further development of the above-mentioned presently preferred embodiment, the tensioning device comprises an orientation element, and wherein the slot is configured to accommodate the orientation element. Having the orientation element accommodated within the slot of the shielding device prevents the tensioning device from rotating during operation of the screening arrangement.

In a second aspect of the invention method for manufacturing a screening arrangement is provided.

Other presently preferred embodiments and further advantages will be apparent from the subsequent detailed description and drawings.

A feature described in relation to one of the aspect may also be incorporated in the other aspect, and the advantage of the feature is applicable to all aspects in which it is incorporated.

Brief Description of Drawings

For exemplifying purposes, the invention will be described in closer detail in the following with reference to embodiments thereof illustrated in the attached drawings, wherein:

Fig. 1a is a perspective view of a screening arrangement in an embodiment of the invention, with the screening body in an unwound, screening position;

Fig. 1b is a view corresponding to Fig. 1a, with the screening body in a wound-up, non-screening position;

Fig. 2a is a perspective view of a roof window with a screening arrangement in another embodiment of the invention;

Figs 3a and 3b are simplistic perspective views of the operational principles of a cord system, with a screening body in an unwound screening position;

Figs 4a to 4e are views from various angles of a shielding device in an embodiment of the screening arrangement according to the invention;

Figs 5a to 5f are views from various angles of the shielding device of Figs 4a to 4e interacting with a spring device of a tensioning device of the screening arrangement;

Fig. 6 is a part-sectional view of the lower left-hand corner of the screening arrangement of the invention; and

Fig. 7 is a view corresponding to Fig. 6, with some details of the screening arrangement in the embodiment of Fig. 6 shown in cross-section.

Description of Embodiments

In the following detailed description, preferred embodiments of the present invention will be described. Flowever, it is to be understood that features of the different embodiments are exchangeable between the embodiments and may be combined in different ways, unless anything else is specifically indicated. It may also be noted that, for the sake of clarity, the dimensions of certain components illustrated in the drawings may differ from the corresponding dimensions in real-life implementations. It is noted that terms such as “up”, “down”, “left-hand”, “right-hand”,

“exterior”, “interior”, “outer”, “inner” are relative and refers to the viewpoint in question.

Figs 1a and 1b Referring initially to Fig. 1a and Fig. 1b, where perspective views of a screening arrangement 1 in an embodiment of the invention are shown, it is seen how the screening arrangement 1 comprises a screening body 11, a top casing 23 and a bottom profile 15.

The screening arrangement 1 is configured to be mounted on a roof window 2 (see Fig. 2a) to assume a mounted condition, in which the screening body 11 is movable in a general longitudinal direction between a non-screening position and a number of non-screening positions in which the screening body 11 at least partially covers an opening of the roof window 2.

The screening arrangement 1 further comprises a roller shaft 14 (Figs 3a and 3b) accommodated in the top casing 23 and connected to drive means, the drive means being configured to rotate the roller shaft 14 in a winding direction W1 and an unwinding direction W2 (see Figs 3a and 3b).

The screening body 11 has two side edges and a predefined length between a first end portion and a second end portion. The first end portion is connected to the roller shaft 14 accommodated in the top casing 23 such that the screening body 11 may be wound on the roller shaft 14 in the non-screening position. The second end portion is connected to a bottom profile 15.

Furthermore, the screening arrangement comprises two side rails 21, 22, a first side rail 21 and a second side rail 22 to guide at least opposing ends of the bottom profile 15. In some embodiments, also the side edges of the screening body 11 may be guided in the side rails 21, 22. The term “ends” of the bottom profile 15 is to be construed to encompass any structure of the bottom profile 15 suitable to interact with the side rails 21, 22, including separate elements and one-piece configurations.

In Fig. 1a, the screening body 11 is shown in an unwound screening position, and in Fig. 1b the screening body is shown in a non-screening position, in which the screening body 11 is wound and stored on the roller shaft 14 in the top casing 23. In the non-screening position, the bottom profile 15 may either be completely accommodated within the top casing 23, or protrude slightly therefrom. Fig. 2a

The screening arrangement 1 is configured to be mounted on the exterior side of the roof window 2, which in turn is typically mounted in an inclined roof surface (not shown). The roof window 2 has a frame structure 3 and a sash structure 4. The frame structure 3 is configured to extend in parallel to the roof surface, while the sash structure 4 is configured to be opened to a variety of positions, for instance as shown in Fig. 2a. The frame structure 3 and the sash structure 4 each has a top member 3a, 4a and a bottom member 3d, 4d and two mutually parallel side members 3b, 3c, 4b, 4c. The sash structure 4 is pivotally connected to the frame structure 3 via hinges 5, in the shown embodiment here at a substantially central hinge axis, however other positions of the hinge axis are conceivable as well. Also visible in Fig. 2a is a pane 7 encased in the sash structure 4.

In order to allow the screening arrangement 1 to follow the movement of the sash structure 4 during opening of the roof window 2, the side rails 21 , 22 are connected to the sash structure 4 in a slidable and rotatable connection at or near the bottom of the sash structure 4. The top casing 23 may either be rotatably or fixedly connected to the roof window 1 , at or near the top of the frame structure 3. The connection between the top casing 23 and the side rails 21 , 22 is either fixed, i.e. the side rails 21 , 22 are rigidly connected to the top casing, or rotatable, i.e. there is a hinge connection (not shown) between the top casing 23 and the side rails 21 , 22. Examples of a roof window with a prior art screening arrangement are shown in the embodiments of applications EP 3 015637 A1 and EP 2 390455 A1 .

In Fig. 2a, a fitting 6 is generally designated to indicate the slidable and rotatable connection between the bottom corners of the sash structure 4, defined by the bottom sash member 4d and the side sash members 4c, 4b, to the first side rail 21 and the second side rail 22, respectively. The fittings 6 allow for the sash structure 3 to be guided along the side rails 21 , 22 when the sash structure 4 is pivoted about its hinge axis when opening the roof window 2.

In the embodiment of Fig. 2a, the top casing 23 comprises a slightly curved cover portion 232 and an end portion 233 at each of the longitudinal ends of the top casing 23. Furthermore, a solar panel 231 is placed in the top casing 23 which could be used to power the screening arrangement 1 , possibly connected to a battery inside the top casing 23; however, power may also be provided from a main housing supply. Wiring, motor control and power means for the motor are not shown. The top casing 23 is rotatably connected to the frame structure 3 of the roof window 2 with a top casing hinge 234. The side rails 21 , 22 are, at respective first fixed ends, rigidly, i.e. fixedly connected to the top casing 23 such that the side rails 21 , 22 may pivot out of the plane defined by the roof surface and the frame structure 3 when opening the sash structure 4.

Figs 3a and 3b

Referring now to Figs 3a and 3b, which show the operating principle and possible configurations of a cord system of embodiments of the screening arrangement 1 of the invention, two guidance cords 12 are provided to ensure parallel guidance of the bottom profile 15 during operation of the screening arrangement 1 .

Each guidance cord 12 is, at one end, connected to a respective winding device including a winding reel 16, and, at another end, connected to a tensioning device generally designated 13 in the bottom profile 15. The configuration of such winding reels are well-known as such, one example being found in the embodiment of Applicant’s WO 2006/074653 A1. It is noted that the term “in the bottom profile” should be interpreted in its broadest sense, thus including positions at or near a wall of the bottom profile, such as for instance behind a front wall of an open profile.

The guidance cords 12 are wound on the winding device oppositely relative to how the screening body 11 is wound on the roller shaft 14, i.e. when the roller shaft 14 rotates in the winding direction W1 , the screening body 11 is wound, while the guidance cords 12 are unwound, and vice versa when the roller shaft 14 rotates in the unwinding direction W2. The winding device including the winding reel 16 and the roller shaft 14 are both accommodated in the top casing 23.

In principle, the winding reels 16 should unwind/wind a length of guidance cord 12 substantially equal to the length of screening body 11 wound/unwound by the roller shaft 14 when the bottom profile 15 is moved in the general longitudinal direction of the screening arrangement 1 as defined by the screening body 11 and the side rails 21 , 22. However, due to variations in the effective diameter of the roller shaft 14 caused by successive windings of the screening body 11 in dependence on the amount of screening body 11 wound on the roller shaft 14, the guidance cords 12 are slackened, thereby impairing the parallel guiding function. To compensate for slack in the guidance cords 12, the tensioning device 13 provides a tension on the guidance cords 12 such that during operation, variations in the required length of the guidance cords 12 is accommodated for.

In the configuration shown in Fig. 3a, the winding reel 16 is arranged at one end of the roller shaft 14. The winding reel 16 can however, also be arranged inside the roller shaft 14 as shown in Fig. 3b, such that the roller shaft 14 and thus also the screening body 11 may be made wider, or two winding reels, one at the respective end of the roller shaft 14.

Also visible in the general overviews of Figs 3a and 3b are return elements 10 for guiding the respective guidance cord 12 from the winding reel 16 around the associated return element 10 and up to and into the bottom profile 15, and further to the tensioning device 13. Since the return element 10 is located at or near the free end of the respective side rail 21 , 22, this means that the returning or upwards directed part of the guidance cord 12 runs alongside the downwards directed part of the guidance cord 12 from the winding reel 16 to the return element 10. The upwards directed part of the guidance cord 12 may run in the same track of the respective side rail 21 , 22 as the downwards directed part of the guidance cord 12. In the embodiment shown in one and the same track 221 (of. Fig. 8) of the side rail 22.

In the embodiments shown, the screening arrangement comprises an external screening arrangement with a substantially flat screening body also known as a panzer as seen in the unwound screening position, but the concept is applicable also to other forms of screenings such as awning blinds, external roller blinds, roller shutters with various types of lamellae etc. Figs 4a to 4e and 5a to 5f

In the following, details of an embodiment of a shielding device 17 located in the bottom profile 15 will be described in further detail. The shielding device 17 extends longitudinally between a first end 171 and a second end 172. The length of the shielding device 17 is chosen such that the tensioning device 13 is at least partly accommodated within the shielding device 17 between the first end 171 and the second end 172. The shielding device 17 in the shown embodiment is chosen with a longitudinal extension between the first end 171 and the second end 172 to fully accommodate the tensioning device 13. The shielding device 17 comprises a locking element 177 protruding from the first end 171 of the shielding device 17, and the bottom profile 15 comprises a receiving space 155 such that the locking element 177 is engaged with the receiving space 155 in a form-locking connection.

The shielding device 17 has a tubular configuration of circular, oval, or rectangular cross-section, preferably of such dimensions that at least point of contact is present between the interior of the tubular configuration of the shielding device 17 and the tensioning device 13.

In the embodiment shown, the shielding device 17 has a substantially rectangular, preferably substantially square, cross-section, comprising a first longitudinal side 173a and an opposite second longitudinal side 17b, as well as opposite third and fourth longitudinal sides 173c, 173d, each first to fourth longitudinal sides 173a, 173b, 173c, 173d extending in-between the first end 171 and the second end 172 of the shielding device 17, and wherein the second longitudinal side 174 comprises a slot 176, the slot 176 extending throughout the length of the second longitudinal side 173b. The slot 176 is manufactured to taper at the first end 171 and the second end 172 to expand the width of the slot at the first end 171 and the second end 172. The tapered ends of the slot 176 may help to facilitate insertion of the tension device 13 into the shielding device 17. The first longitudinal side 173a comprises one or more hinges 175, and wherein the one or more hinges 175 and the slot 176 allows for the shielding device 17 to be opened and closed, the shielding device 17 being preferably symmetrical along an axis extending through said one or more hinges 175. The hinges 175 in the shown embodiment are moulded hinges 175. Alternatively, the shielding device 17 may be manufactured in two pieces and subsequently be connected by hinges.

At least two hinges 175 are provided and one or more gaps 174 are present in-between neighbouring hinges 175. Alternatively, only one hinge 175 is provided, which may extend throughout the first longitudinal side 173a, or it may just extend throughout a part of the first longitudinal side 173.

The tensioning device 13 comprises an orientation element 135, and wherein the slot 176 is configured to accommodate the orientation element 135. The orientation 135 element protrudes out from the interior of the shielding device 17.

The spring device of the tensioning device 13 comprises at least one compression spring 131 which is accommodated within the shielding device 17 substantially in its entirety.

The shielding device 17 is made from a plastic or metal material. It has been found that even a shielding device made of metal may help with dampening of sound.

Figs 6 and 7

Reference is now made to Fig. 6, which shows a part-sectional view of a corner of the screening arrangement 1 of the invention, namely the lower left-hand corner as seen from the exterior side of the external screening arrangement 1 when mounted on the roof window 2. The side rail 22 of the screening arrangement 1 is provided with a corner cap 24. Located within the corner cap 24 is the return element 10. The return element 10 is configured for leading the guidance cord 12 running in the side rail 22 to the tensioning device 13. The guidance cord 12 is then able to interact with the spring device 131 . As is seen, the shielding device 17 substantially covers the tensioning device 13. The shielding device 17 is accommodated within the bottom profile 15.

Referring to Fig. 7, the bottom profile 15 comprises a side element 151. The side element 151 comprises the receiving space 155 where the locking element 177 of the shielding device 17 is received in a form locking manner. Thereby, it is assured that the shielding device 17 does not move excessively during movement of the bottom profile 15.

The hinges 175 of the shielding device 17 allows for the shielding device 17 to be removed or changed for another shielding device. Furthermore, the shielding device 17 may also be retrofitted on other screening assemblies comprising a tensioning device as per the invention. The hinges 175 of the shielding device 17 may also assist in the manufacturing of screening arrangement 1. Specific embodiments of the invention have now been described.

However, several alternatives are possible, as would be apparent for someone skilled in the art. Such and other obvious modifications must be considered to be within the scope of the present invention, as it is defined by the appended claims.

List of reference numerals

I screening arrangement

2 roof window

3 frame structure 3a top frame member 3b side frame member 3c side frame member 3d bottom frame member

4 sash structure

4a top sash member 4b side sash member 4c side sash member 4d bottom sash member

5 hinge

6 fitting

7 pane

10 return element

I I screening body

12 guidance cord

13 tensioning device 131 spring device

135 orientation element

14 roller shaft

15 bottom profile

150 end of bottom profile

151 side element of bottom profile 155 receiving space

16 winding reel

17 shielding device

171 first end

172 second end

173a first longitudinal side 173b second longitudinal side 173c third longtitudinal side 173d fourth longitudinal side

174 gap

175 hinge

176 slot

177 locking element

21 first side rail

22 second side rail

221 track

23 top casing

231 solar panel

232 cover portion 233 end portion

234 top casing hinge

24 corner cap

25 corner cap

W1 winding direction

W2 unwinding direction

Claims

1. A screening arrangement (1 ) for a roof window (2), the roof window (2) having a window opening, a frame structure (3) and a sash structure (4) extending in parallel to the roof surface, each with top (3a, 4a) and bottom members (3d, 4d) and two mutually parallel side members (3b, 3c, 4b, 4c), the screening arrangement (1) comprising: a screening body (11) having two side edges and a predefined length between a first end portion and a second end portion, said screening body (11 ) being movable in a longitudinal direction between a non-screening position and a first screening position in which the screening body (11 ) substantially covers the window opening, a top casing (23) configured to extend substantially in parallel with the top member of the frame and sash structure, a roller shaft (14) accommodated in the top casing (23) and connected to drive means, the drive means being configured to rotate the roller shaft (14) in a winding direction and an unwinding direction, the first end portion of the screening body (11) being connected to the roller shaft (14) such that the screening body (11) is wound on the roller shaft in the non-screening position, a winding device comprising at least one winding reel (16) in connection with the roller shaft (14), a bottom profile (15) extending substantially in parallel with the top casing (23) between two ends (150) and connected to the second end portion of the screening body (11 ), side rails (21, 22) extending substantially in parallel with a respective side member of the frame and sash structure and configured to guide at least the ends (150) of the bottom profile (15), a cord system including at least one guidance cord (12) having a first end in connection with the winding device and a second end in connection with the bottom profile (15), and which is configured to apply a tensioning force to the screening body (11 ), at least one return element (10) for the at least one guidance cord (12), a tensioning device (13) accommodated in the bottom profile (15) and comprising at least one spring device (131) for tensioning the at least one guidance cord (12) with a spring bias, characterised in that the bottom profile (15) further comprises a shielding device (17) extending longitudinally between a first end (171 ) and a second end (172), and that the tensioning device (13) is at least partly accommodated within the shielding device (17) between the first end (171) and the second end (172).

2. A screening arrangement (1 ) according to claim 1 , wherein the shielding device (17) comprises a locking element (177) protruding from the first end (171 ) of the shielding device (17), and wherein the bottom profile (15) comprises a receiving space (155), and wherein the locking element (177) is engaged with the receiving space (155) in a form-locking connection.

3. A screening arrangement (1 ) according to any of the preceding claims, wherein the shielding device (17) has a tubular configuration of circular, oval, or rectangular cross-section, preferably of such dimensions that at least point of contact is present between the interior of the tubular configuration of the shielding device (17) and the tensioning device (13).

4. A screening arrangement (1 ) according to claim 3, wherein the shielding device (17) has a substantially rectangular, preferably substantially square, cross-section, comprising a first longitudinal side (173a) and an opposite second longitudinal side (17b), as well as opposite third and fourth longitudinal sides (173c, 173d), each first to fourth longitudinal sides (173a, 173b, 173c, 173d) extending in-between the first end (171 ) and the second end (172) of the shielding device (17), and wherein the second longitudinal side (174) comprises a slot (176), the slot (176) extending throughout the length of the second longitudinal side (173b).

5. A screening arrangement (1 ) according to claim 4, wherein the first longitudinal side (173a) comprises one or more hinges (175), and wherein the one or more hinges (175) and the slot (176) allows for the shielding device (17) to be opened and closed, the shielding device (17) being preferably symmetrical along an axis extending through said one or more hinges (175).

6. A screening arrangement (1 ) according to claim 5, wherein at least two hinges (175) are provided and one or more gaps (174) are present in- between neighbouring hinges (175).

7. A screening arrangement (1 ) according to any of claims 4 to 6, wherein the tensioning device (13) comprises an orientation element (135), and wherein the slot (176) is configured to accommodate the orientation element (135).

8. A screening arrangement (1 ) according to any of the preceding claims, wherein the spring device of the tensioning device (13) comprises at least one compression spring (131 ) which is accommodated within the shielding device (17) substantially in its entirety.

9. A screening arrangement (1) according to any one of the preceding claims, wherein the shielding device (17) is made from a plastic or metal material.

10. A screening arrangement (1) according to any one of the preceding claims, wherein said side rails (21 , 22) are rigidly connected to the top casing (23), the top casing (23) being rotatably connected to the top frame member (3a), and wherein a set of fittings (6) is connected to the sash (4) at or near the bottom sash member (4d) allowing at least translational and rotational movement of the side rails (21 , 22) relative to the sash (4).

11. A method for manufacturing a screening arrangement (1 ) according to any one of claims 1 to 10, comprising the steps of: a) providing a screening arrangement comprising a screening body (11 ) having two side edges and a predefined length between a first end portion and a second end portion, a top casing (23), a roller shaft (14) accommodated in the top casing (23) and connected to drive means, the first end portion of the screening body (11 ) being connected to the roller shaft (14), a winding device comprising at least one winding reel (16) in connection with the roller shaft (14), a bottom profile (15) extending substantially in parallel with the top casing (23) and connected to the second end portion of the screening body (11), side rails (21, 22), a cord system including at least one guidance cord (12) having a first end in connection with the winding device and a second end in connection with the bottom profile (15), at least one return element (10) for the at least one guidance cord

(12), a tensioning device (13) comprising at least one spring device

(131), b) providing a shielding device (17), which extends longitudinally between a first end (171) of the shielding device (17) and a second end (172) of the shielding device (17), c) arranging the tensioning device (13) into the shielding device (17), and d) positioning the tensioning device (13) with the shielding device (17) in the bottom profile (15).

12. A method according to claim 11 , in which the shielding device (17) provided in step b) comprises a first longitudinal side (173a) and an opposite second longitudinal side (17b), as well as opposite third and fourth longitudinal sides (173c, 173d), each first to fourth longitudinal sides (173a, 173b, 173c, 173d) extending in-between the first end (171) and the second end (172) of the shielding device (17), in which the second longitudinal side (174) comprises a slot (176), the slot (176) extending throughout the length of the second longitudinal side (173b), in which the first longitudinal side (173a) comprises one or more hinges (175), and in which the one or more hinges (175) and the slot (176) allows for the shielding device (17) to be opened and closed, whereby step b) further comprises providing the shielding device (17) in an open state, and whereby step c) further comprises the steps of: c.1 ) aligning the shielding device with the tensioning device, and c.2) closing the shielding device around the tensioning device.

13. A method according to claims 11 and 12, wherein the provided tensioning device (13) further comprises an orientation element (135), where step c) further comprises the step of: c.3) aligning the orientation element (135) of the tensioning device (13) with the slot (176) of the shielding device (17).