Insertable screen

Abstract

The invention provides a screen for attachment onto a building frame like a door frame of a window frame, the screen comprising: a screen frame defining a circumference of the screen and defining a planar plane; a screen mesh fixed to the screen frame; the screen frame comprising a series of profile sections having an attachment provision extending along the profile section, and corner parts for coupling the profile sections to provide the screen frame, wherein at least two of the corner parts are sliding corner parts each comprising at least one corner part end that is slidingly coupled to the attachment provision for allowing the circumference of the screen to be changed for placement of the screen onto the building frame, wherein a biasing spring element is provided between the corner part end and a locking part that is locked at a longitudinal locking position on the attachment provision.

Description

Field of the invention

[0001] The invention relates to an insertable screen.Background of the invention

[0002] WO2020247951 according to its abstract relates to "A method for manufacturing a flexible screen frame from a flat wire having a coating includes bending the wire to substantially match the desired shape of the screen frame. The flat wire has a first end and a second end and the coating is removed from both ends to create bare wire portions that can be welded. A shrink tube is then slid onto the wire and moved away from the ends to be welded. Then, the ends are welded together and the shrink tube is used to cover the bare wire portions and the weld point. A screen mesh is then melted onto the frame.".

[0003] EP2978918 according to its abstract relates to "Screens for use in door or window openings are disclosed. The screens have a screen frame having at least one portion fabricated from a material possessing spring-like characteristics and a screen mesh that is secured to the screen frame to cover the door or window opening. The screen frame and screen mesh are in tension when the screen resides in the door or window opening. The screen frame may be deformed temporarily, due to its fabrication, allow for simple and easy removal and insertion of the screens into the door or window opening.".

[0004] BR102016019896 according to its English-language translation relates to "SET WITH FRAME ASSEMBLY SYSTEM FOR SCREEN AGAINST INSECTS, FOR AUTOMATIC ADJUSTMENT TO WINDOWS.

[0005] To close and open through its frame (1), in order to adapt to various widths of spans (V) of windows, protecting the environment against the entry of insects and dust through its woven screen (20), which can receive varied colors and patterns of images, adding an ornamental effect to the screen against insects. The frame (1) is structured between horizontal (2) and vertical (3) rods mounted with elbows (11) and curved tubular angles (18) and (19), opposed. For use, elbows (11) and curved tubular angles (18) and (19) move slidingly through a coupling from their coupling terminals (12) with oblong slot (13), in a stop arrangement ( 9) and a tubular spacer (8) acting against a spring (16). In the case of spans (V) of windows with opening differences both by the horizontal walls and by the vertical walls, after contraction of both the elbow (11) and the curved angles (18) and (19), these move against the end (4) of the rods (2) ".Summary of the invention

[0006] A disadvantage of prior art is that the complete screen lacks stability. Placement in modern window constructions may be challenging.

[0007] Hence, it is an aspect of the invention to provide an alternative screen, which preferably further at least partly obviates one or more of above-described drawbacks.

[0008] There is provide a screen for attachment onto a building frame like a door frame of a window frame, the screen comprising: a screen frame defining a circumference of the screen and defining a planar plane; a screen mesh fixed to the screen frame; the screen frame comprising a series of profile sections having an attachment provision extending along the profile section, and corner parts for coupling the profile sections to provide the screen frame, characterised in that at least two of the corner parts are sliding corner parts each comprising at least one corner part end that is slidingly coupled to the attachment provision for allowing the circumference of the screen to be changed for placement of the screen onto the building frame, wherein a biasing spring element is provided between the corner part end and a locking part that is locked at a longitudinal locking position on the attachment provision.

[0009] There is further provided a method for providing a screen of any one of the preceding claims, comprising: selecting a bias spring with a bias spring length S and a spring constant X and a specification of a required mounting force, being the force with which the screen frame clamps inside or around a building frame opening; calculate a designed bias range of each side of the screen frame; provide a series of sliding corner end parts providing at least one sliding length change to each profile section using the bias spring; determine a building frame heigh and building frame width of the building opening; produce profile sections by taking the building frame height and building frame width, respectively and reduce these with less than the bias range; assemble the screen frame, and attach a screen mesh to the screen frame.

[0010] There is further provided a sliding corner part for mounting on a profile section with an attachment provision, the sliding corner part comprising a corner part end that can be slidingly received on the attachment provision, wherein a biasing spring element is provided between the corner part end and a locking part that comprising locking provisions for locking the locking part at a longitudinal locking position on the attachment provision.

[0011] The current screen is in particular insertable. One use of the screen is to keep insects, like mosquitoes, out of a building while being able to open for instance a window or door. The screen mesh is well known in the art to a skilled person, and does not need further discussion.

[0012] The current invention allows a change length for each side of the screen frame. The change of length can be for instance 1-5 cm in case of one sliding element per profile section, and up to 10 cm if a profile section is coupled to two sliding elements. A compression or extension of a bias spring element once the screen is places should be set in such a way that the screen frame clamps inside or around a building frame with enough force to keep the screen frame in place. If a bias spring with a high spring constant (N / m) is used, only a slight change of circumference can be sufficient, in some instances a change of about 0.5 cm once the screen is placed might be sufficient.

[0013] A part of the corner parts may be of the "sliding" type, or not all the parts of a corner part are of the "sliding" type. For most situations, if a profile section is provided with one sliding type corner part providing one sliding end at one profile section end can be sufficient.

[0014] In the current description and claims, the feature "Slidingly coupled" and "sliding" are used. If a past as illustrated slides, that means that without exerting a high human hand and arm force, parts slide. In fact, the sliding can be such that the force of gravity when rotating a screen frame would allow parts to slide, if no force of the bias spring would apply. I.e., a smooth sliding is preferred.

[0015] The profile section can be of any known type. Most often used are profile sections that are from aluminium and extruded, and subsequently anodized or painted. A profile section is a length of such an element, usually a length of 1-6 meters is provided, which are subsequently made into profile sections that are used in screens, usually resulting in profile sections of between 20 cm and 2 meters long.

[0016] An attachment provision as used in the current description and claims relates to an element that usually extends longitudinally along and part of a profile section. Such a current attachment provision can comprise a flange, a rail, a slot, a groove, and the like.Detailed description of the invention

[0017] With respect to the screen, corner part and the method, the following embodiments are suggested.

[0018] In an embodiment, the attachment provision is selected from a groove and a rail. In a particular embodiment, the attachment provision comprises a groove. A groove can provide a concealment end hiding of the various elements of the sliding corner part.

[0019] In an embodiment, the biasing spring elements are positioned in the groove at a neutral position, providing the spring elements to be extended and / or compressed. In such an embodiment, the sliding corner parts are positioned with their ends slidingly provided in the groove for allowing the circumference to be changes, i.e. decreased from a maximum circumference to a decreased circumference and increased from a minimum circumference to an increased circumference, for fitting the screen onto a building frame. Such a building frame can for instance en a window frame. The screen can be installed onto a window frame.

[0020] In an embodiment, the biasing spring elements are compression spring elements. Such bias spring elements can be or comprise a coil spring, or for instance in an embodiment rubber compression spring elements. In an embodiment, the sliding corner parts are positioned in the frame for allowing the circumference to be decreased, from a maximum circumference to a decreased circumference, for fitting the screen into a building frame like a window frame.

[0021] In an embodiment, the biasing spring elements are extension spring elements. In such an embodiment, the sliding corner parts are positioned in the frame for allowing the circumference to be increased, from a minimum circumference to an increased circumference, for fitting the screen about a building frame like a window frame.

[0022] In an embodiment, the screen further comprises a bias range manager, comprising a coupling end slidingly coupling the sliding corner part end and the locking part, and comprising a first stop and a second stop for defining a coupling end first longitudinal stop position and a second longitudinal stop position and a bias range as a longitudinal distance between the first stop and second stop.

[0023] In an embodiment, the screen frame is a rectangular frame comprising four profile sections. In a particular embodiment, the profile sections are coupled by four sliding corner parts each comprising at least one sliding end. In an even more particular embodiment, the sliding corner parts provide at least one sliding corner part end per profile section.

[0024] In an embodiment, the sliding corner parts have at least one sliding end. In a particular embodiment, the sliding corner parts have two sliding ends.

[0025] In an embodiment of the sliding corner part it further comprising a bias range setting part for setting a minimum and maximum distance between sliding end and locking end.

[0026] In an embodiment of the sliding corner part the bias range setting part comprises an extension end slidingly coupling the sliding corner part and the locking end providing a bias range dBias. In a particular embodiment, the bias range setting part couples the sliding end and the locking end at a distance from one another.

[0027] In an embodiment, the extension end has one of its ends comprising an engagement part and one of the sliding end and the locking end comprising a first stop and a second stop for engaging the engagement part, a distance between the first stop and the second stop. This allows setting the bias range dBias.

[0028] In an embodiment of the sliding corner part, the corner part end are coupled to one end of a biasing spring element and an opposite end of the biasing spring element is coupled to a locking part for locking into a locking position on the attachment provision.

[0029] In an embodiment of the sliding corner part, the bias range setting part comprises an extension end. In a particular embodiment, the extension end comprises a rod. In an embodiment, the extension end is slidingly coupled to at least one selected from sliding corner part end and to locking end and comprising at least one slide stop. In a particular embodiment, the bias range setting part comprises two slide stops, with the distance between the slide stops defining the bias range.

[0030] There is further provided a screen comprising profile sections coupled at their ends, in particular via corner parts, wherein the profile sections are bent to bulge outward. In particular the profile sections are bent to have a radius of curvature of between 10 and 50 m, in particular between 12 and 40 m. In particular when using aluminium profile sections, this provides a good tensioning of the screen mesh and prevents warping of the screen frame of screen. Usually, the aluminium profile sections have a wall thickness of between 1 and 2 mm. The profile sections in an embodiment have a width of 0.5-2.5 cm, in particular a width of 1-2 cm. The profile sections in an embodiment have a thickness of 0.3-1.0 cm, in particular between 0.4 and 0.8 cm.

[0031] The term "substantially" herein, such as in "substantially consists", will be understood by the person skilled in the art. The term "substantially" may also include embodiments with "entirely", "completely", "all", etc. Hence, in embodiments the adjective substantially may also be removed. Where applicable, the term "substantially" may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%. The term "comprise" includes also embodiments wherein the term "comprises" means "consists of'.

[0032] The term "functionally" will be understood by, and be clear to, a person skilled in the art. The term "substantially" as well as "functionally" may also include embodiments with "entirely", "completely", "all", etc. Hence, in embodiments the adjective functionally may also be removed. When used, for instance in "functionally parallel", a skilled person will understand that the adjective "functionally" includes the term substantially as explained above. Functionally in particular is to be understood to include a configuration of features that allows these features to function as if the adjective "functionally" was not present. The term "functionally" is intended to cover variations in the feature to which it refers, and which variations are such that in the functional use of the feature, possibly in combination with other features it relates to in the invention, that combination of features is able to operate or function. For instance, if an antenna is functionally coupled or functionally connected to a communication device, received electromagnetic signals that are receives by the antenna can be used by the communication device. The word "functionally" as for instance used in "functionally parallel" is used to cover exactly parallel, but also the embodiments that are covered by the word "substantially" explained above. For instance, "functionally parallel" relates to embodiments that in operation function as if the parts are for instance parallel. This covers embodiments for which it is clear to a skilled person that it operates within its intended field of use as if it were parallel.

[0033] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0034] The devices or apparatus herein are amongst others described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation or devices in operation.

[0035] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements. In the device or apparatus claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

[0036] The invention further applies to an apparatus or device comprising one or more of the characterising features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterising features described in the description and / or shown in the attached drawings.

[0037] The various aspects discussed in this patent can be combined in order to provide additional advantages. Furthermore, some of the features can form the basis for one or more divisional applications.Brief description of the drawings

[0038] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which: Figure 1 schematically depicts an embodiment of the screen in a composite window frame; Figure 2 shows a cross section of a composite window frame with a screen in cross section; Figure 3 an embodiment of a sliding corner part, and Figure 4A and 4B respectively show a sliding corner part in extension and in minimum circumference position.

[0039] The drawings are not necessarily on scaleDescription of preferred embodiments

[0040] Figure 1 schematically depicts a part, in cross section, of a current plastic or synthetic window (or door) frame 2 with a window frame 7 and a moveable window sash 8 (in short, window sash) holding a pane (not shown). In many of these frames, there is a space below / between the window sash 8 and the window frame 7, often for insulation.

[0041] It is often desired to place a screen 1 in the frame opening in order to keep insects out. These screens in particular also keep insect out when the window sash 8 is of the type swing-tilt. There are known solutions that provide a ridged frame with screen mesh in the frame opening.

[0042] There is provided a screen 1 comprising a screen frame 3 and a screen mesh (not shown) attached to the screen frame 3. The screen mesh defines a screen plane that is usually a flat plane. The screen frame 3 can have many shapes, though often it is rectangular.

[0043] The current embodiment of the screen frame 3 comprises profile sections 4 and corner parts 5 connecting the profile sections into a screen frame 3 with a circumference. In particular, the current corner part is a sliding corner part, allowing the circumference of the screen frame to be changed, i.e., enlarged or decreased. Each profile section has a longitudinal direction L, For optimal change of circumference, at least one sliding interruption per side of a rectangle (often: per profile section) is desired.

[0044] In the depicted embodiment, the screen 1 is clamped within the circumference of the window frame 7.

[0045] In figure 2, the same configuration of figure 1 is shown, now in vertical cross section. Here the right side of the drawing is the outside, and the left side is the indoors side of a building.

[0046] The screen frame 3 with the screen mesh 9 is positioned in place. As mentioned, here the screen frame 3 clamps in the window frame 7. The orientation is such that the screen mesh 9 is in between the window sash 8 and the rubbers of the window frame 7. When the window sash 8 swings or turns open, the screen 1 stays in place, clamped. When the window sash 7 tilts, the screen 1 also stays in place.

[0047] The cross section shows how in the current embodiment, the profile section 4 has a mesh attachment groove 10 that opens to / towards a mesh side of the profile section 4. The profile section 4 further comprises a groove 12 as an embodiment of the attachment provision. Here, the groove 12 opens away from the screen frame 3. In this embodiment, the screen mesh 9 is attached to the screen frame 3 using the mesh attachment grove 10. It goes without saying that other ways of attaching the screen mesh 9 to the screen frame 3 are possible, like glueing the screen mesh to the screen frame, or clamping it in any other way to the screen frame 3. In the current embodiment, the screen mesh 9 is clamped in the mesh attachment groove 10 via a clamping string 11 that needs to be pushed into the mesh attachment groove 10. An advantage of this way of attaching is that screen mesh 9 can easily be replaced. The groove 12 can also open towards or into the screen frame, as can be seen in figure 1, the profile section 4 having its longitudinal direction L indicated. An advantage or this "inward" orientation is that the groove 12 also allows clamping of a handling handle (not illustrated) that can be used to assist in placing and installing of the screen 1.

[0048] Figure 3 shows a sliding corner part 5 with in this embodiment two sliding ends 6. The cross sections of the sliding ends 6 are adapted to slidingly fit in the groove 12 of a profile section.

[0049] The sliding ends 6 are coupled at their end to a bias spring 16. The other end of the bias spring 16, remote of the sliding end 6, is coupled to locking end 13. In this embodiment, "coupling" relates to a mechanical coupling. The locking end 13 allows locking the sliding corner part 5 into groove 12. In this way, the (longitudinal) position of the locking end 13 with respect it corresponding profile section 4 is fixed.

[0050] In the current embodiment, the bias spring 16 is coupled in the following way. The end of the sliding end 6 is provided with or attached to an end of threaded rod 15. The opposite end of the threaded rod 15 is slidingly coupled to an end of the locking end 13. The bias spring 16 is placed on the threaded rod 15 and placed between the sliding end 6 and locking end 13. In this way, a distance or space d between the sliding end 6 and the locking end 13 can vary. The locking end 13 comprised a chamber or slit or groove 14. An extension end guide mounted at an end of the threaded rod 15 can slide back and forth in the chamber 14. The chamber 14 provides a first stop d1 and a second stop d2.

[0051] Evidently, this can be reversed, i.e., the sliding end 6 can be provided with a chamber 14 and an end of the threaded rod can be fixed to the locking end 13.

[0052] The chamber or slot 14 with the extension end 15, here a rod 15, and extension end guide 17 comprise part of the bias range setting part. In particular, the extension end 15 in the current embodiment is a threaded rod 15. With the extension end guide 17 comprising a nut, the position of the nut on the threaded rod 15 sets the distance between the sliding corner part end 6 and the locking end 13. The chamber 14 shape and the shape of the extension end guide 17 are mutually adapted to allow the extension end guide 17 to slide in longitudinal direction in the chamber 14 between a first stop d1 and a second stop d2. The longitudinal distance between the first stop d1 and the second stop d2 in fact sets the bias range d Bias .

[0053] The bias spring 16 can be of a type compression bias spring 16. For instance a traditional coil spring, or a block of rubber or rubber-type material.

[0054] The locking end 13 can further be provided with attachment provisions 18 for attaching the locking end 13 in a set position in the groove 12 of a profile section, the longitudinal locking position. Such an attachment provision18 can in an embodiment be one or more screws that can extend through the locking end 13 and can be made to press inside groove 12.

[0055] In the embodiment of figure 3, a slicing corner part has two sliding corner part ends 6. In an embodiment, a sliding corner part end can have one non-sliding corner part end and one sliding corner part end 6 (with bias spring 16, and locking end 13). If these "one sliding corner part end 6" corner part 5 all are the same, it cam provide a screen frame with a sliding option for each profile section 4 in case of a rectangular screen 1. This would allow changing the circumference uniformly, by changing all sides of the screen frame 3. The "non sliding" corner part end, would be much like a sliding corner part end 6, and would ne fixed to a profile section, for instance using screws for instance at positions of the small circles on the corner part ends.

[0056] Figures 4A end 4B show a sliding corner part 5 with profile sections 4 coupled to the sliding corner part 5. The corner element 19 of sliding corner part 5 here has a groove 10 that continues groove 10 of the profile part 4 if the manner of connecting the screen mesh 9 described above is desired.

[0057] The sliding corner part 5 has corner part ends 6 that have a cross section adapted for slidingly fitting in the corresponding groove 12. In figure 4A, the corner part ends 6 are slid out of the grooves 12 (in longitudinal direction) to their set maximum extend in case of a compression spring 16 or to its minimum extend in case of an extension spring 16. In any case, no external force along a longitudinal direction L is being exerted. At that position, the bias force exerted by bias spring 16 can be zero. Alternatively, the extension end guide is at its stop position d2. Usually, the position of the stop position d2 and the rest length of the bias spring 16 is such that there will be some force exerted by bias spring 16.

[0058] In the current situation, suppose a compression spring is applied. Thus, when compressing from the position of figure 4A to the max bias position of figure 4B, the circumference of the screen frame 3 will reduce from a maximum circumference (figure 4A) to a minimum circumference (figure 4B). For placement inside a window frame as illustrated in figures 1 and 2, the sliding corner parts 5 of screen frame 3 will be compressed close to their maximum bias position. The screen frame 3 will be designed to have its minimum circumference smaller that the window frame opening circumference. When released into the window frame opening, the screen frame 3 will extend until it reaches the window frame circumference. At this position, the screen frame circumference is designed to not yet have reached its maximum circumference. At this state, the bias springs 16 will provide an outward pressure (in the longitudinal direction of attached profile sections 4) that will push the screen frame 3 into the window frame opening and keep it in position, clamped inside the window frame opening. An advantage of the groove 12 is that it allows elements of the sliding corner parts to be concealed. The compression spring 16 reduces the risk of breaking of the spring 16. A polymer compression spring, for instance, is less prone to weather influences, for instance rusting.

[0059] The above description of the drawings relates to a particular, preferred embodiment of the current invention. As explained, the bias spring 16 may be of the compression kind, making the screen frame 3 and screen 1 suitable for insertion and clamping inside a building opening, like a window frame. Selecting an extension spring as bias spring 16, on the other hand, would make the screen 1 suitable for clamping around a frame in a building opening. In such a case, the neutral (i.e., with zero bias) screen frame 3 circumference would be selected smaller than the building frame around which the screen frame is designed to fit. Evidently, the current screen frame construction and design is very flexible with respect to installing (inside or around), circumference, type of screen mesh, and the like. Furthermore, also non-rectangular screens are possible.

[0060] Another aspect that is described in the drawings is that the attachment provision is a groove 12. More in particular, the groove 12 in the current embodiment has a groove opening that is smaller than its largest internal diameter, making it easier to hold the elements or the sliding corner part 5 in the groove 12. The advantages of the groove 12 are explained. In addition, the groove 12 has groove walls provide guidance to the moving parts.

[0061] An alternative attachment provision, however is devisable. In an alternative embodiment, the attachment provision comprises a rail or flange. For instance a rail with a T-shape. In such an embodiment, the locking end 13 would comprise a slot or groove allowing the locking end 13 to be installed on the rail, and to slide over the rails. In such an embodiment, the corner part ends 6 would also be provided with a slot or groove that allows the corner part end 6 to slide over and along the rails. Evidently, various combinations would be possible, like two rails, one for each of the locking end and corner part end. The shape and cross section of such a rail can be selected for additional functionality.

[0062] As already explained above, the screen 1 is produced for a specific opening circumference and mounting type (inside / around). The bias spring 16 has a specification (force per cm compression / extension) which can also be selected based upon for instance opening size. The bias spring length and specification and mounting force (i.e., the force with which the screen frame clamps inside / around the opening), the length change range of each end of a sliding corner part can be determined. With these parameters known, design of the custom screen frame is as follows (based upon a rectangular opening) and using four sliding corner parts 5. Determine the heigh and width of the opening; Suppose using a corner part with one "sliding leg", and the bias range dBias is known, say 3 cm;

[0063] Make width and height profile sections 4 (for instance from a standard length of profile section) by taking the opening with and height, respectively and reduce the opening with and height with the bias range divided by 2.

[0064] In an embodiment, the corner element 19 can be produced as one part in combination with two integrated corner part ends 6. Such a part might for instance as be used as fixed corner part. Such a part may be injection moulded, or produced using an additive manufacturing method, like for instance a 3D printing method.

[0065] For use as a sliding corner part 5, the corner part sliding end 6 can be provided with the extension end 15. As explained, such an extension end 15 may be a threaded rod 15. This can provide adjustability of length of for instance the space between the sliding end 6 and the locking end 13. In such an embodiment, the extension end sliding part 17 can comprise a nut that can slide in chamber 14 of locking end 13.

[0066] In order to fix or lock a position of the locking end 13 with respect to the profile section 4, in an embodiment the locking end 13 may be provided with one or more screws 18 as locking end fixing parts 18. From the groove 12 the screws 18 can be accessed.

[0067] In an alternative embodiment, the corner element is from a metal, like for instance aluminium. In such an embodiment, the sliding end can be produced separately and be inserted and fixed (locked, mounted) in the groove 12 of the corner element 19.

[0068] In order to prevent wrapping and other tension-related issues with the current screen and even with a screen that comprises a frame without sliding corner parts, there is suggested to pre-tension the frame in the following way. The profile sections are provided with a radius of curvature of less than 50 m, in particular a radius of curvature of less than 25 m. The radius of curvature will in most embodiments be larger than 10, in particular larger than 12 m. in most embodiments, the radius of curvature will be between 20 and 12 m. The radius of curvature will be outward of the screen frame. The profile sections in most embodiments will comprise aluminium profile sections. In this way, there is provided a screen frame comprising profile sections coupled via corner parts, wherein the profile sections outward bulging curvature with a radius of curvature of between 10 and 40 m, in particular between 12 and 20 m.

[0069] It will also be clear that the above description and drawings are included to illustrate some embodiments of the invention, and not to limit the scope of protection. Starting from this disclosure, many more embodiments will be evident to a skilled person. These embodiments are within the scope of protection and the essence of this invention and are obvious combinations of prior art techniques and the disclosure of this patent.Reference numbers

[0070] 1Screen 2Building frame 3Screen frame 4Profile section 5Sliding corner part 6Corner part end 7Window frame 8Window sash 9Screen mesh 10Mesh attachment groove 11Mesh attachment string or ribbon 12groove 13locking end 14chamber 15extension end or threaded rod 16bias spring 17extension end guide 18locking end fixing part 19Corner element LProfile section longitudinal dspring length d1first stop d2second stop d bias bias range

Claims

1. A screen for attachment onto a building frame like a door frame of a window frame, the screen comprising: a screen frame defining a circumference of the screen and defining a planar plane; a screen mesh fixed to the screen frame; the screen frame comprising a series of profile sections having an attachment provision extending along the profile section, and corner parts for coupling the profile sections to provide the screen frame, characterised in that at least two of the corner parts are sliding corner parts each comprising at least one corner part end that is slidingly coupled to the attachment provision for allowing the circumference of the screen to be changed for placement of the screen onto the building frame, wherein a biasing spring element is provided between the corner part end and a locking part that is locked at a longitudinal locking position on the attachment provision.

2. The screen of claim 1, wherein the attachment provision is selected from a groove and a rail, in particular the attachment provision comprises a groove.

3. The screen according to claim 1, wherein the biasing spring elements are positioned in the groove at a neutral position, providing the spring elements to be extended and / or compressed, and the sliding corner parts are positioned with their ends slidingly provided in the groove for allowing the circumference to be changes, i.e. decreased from a maximum circumference to a decreased circumference and increased from a minimum circumference to an increased circumference, for fitting the screen onto a building frame, for instance onto a window frame.

4. The screen according to claim 1, wherein the biasing spring elements are compression spring elements, in an embodiment rubber compression spring elements, and the sliding corner parts are positioned in the frame for allowing the circumference to be decreased, from a maximum circumference to a decreased circumference, for fitting the screen into a building frame like a window frame.

5. The screen of claim 1, wherein the biasing spring elements are extension spring elements, and the sliding corner parts are positioned in the frame for allowing the circumference to be increased, from a minimum circumference to an increased circumference, for fitting the screen about a building frame like a window frame.

6. The screen of any one of the preceding claims, further comprising a bias range manager, comprising a coupling end slidingly coupling the sliding corner part end and the locking part, and comprising a first stop and a second stop for defining a coupling end first longitudinal stop position and a second longitudinal stop position and a bias range as a longitudinal distance between the first stop and second stop.

7. The screen according to any one of the preceding claims, wherein the screen frame is a rectangular frame comprising four profile sections, in particular coupled by four sliding corner parts each comprising at least one sliding end, more in particular providing at least one sliding corner part end per profile section.

8. The screen according to any one of the preceding claims, wherein the sliding corner parts have two sliding ends.

9. The screen according to any one of the preceding claims wherein the profile sections are baised to bulge outward in particular having a radius of curvature of between 10 and 50 meters, in particular between 12 and 40 meters.

10. A sliding corner part for mounting on a profile section with an attachment provision, the sliding corner part comprising a corner part end that can be slidingly received on the attachment provision, wherein a biasing spring element is provided between the corner part end and a locking part that comprising locking provisions for locking the locking part at a longitudinal locking position on the attachment provision.

11. The sliding corner part of claim 9, further comprising a bias range setting part for setting a minimum and maximum distance between sliding end and locking end, in particular wherein the bias range setting part comprises an extension end slidingly coupling the sliding corner part and the locking end providing a bias range dBias, in particular coupling the sliding end and the locking end at a distance from one another, in particular the extension end having one of its ends comprises an engagement part and one of the sliding end and the locking end comprising a first stop and a second stop for engaging the engagement part, a distance between the first stop and the second stop setting the bias range dBias.

12. The sliding corner part of any one of claims 9-11, wherein the corner part end are coupled to one end of a biasing spring element and an opposite end of the biasing spring element is coupled to a locking part for locking into a locking position on the attachment provision.

13. The sliding corner part of claims 9-12, the bias range setting part comprises an extension end, in particular a rod, slidingly coupled to at least one selected from sliding corner part end and to locking end and comprising at least one slide stop, in particular two slide stops, with the distance between the slide stops defining the bias range.

14. A method for providing a screen of any one of the preceding claims, comprising: selecting a bias spring with a bias spring length S and a spring constant X and a specification of a required mounting force, being the force with which the screen frame clamps inside or around a building frame opening; calculate a designed bias range of each side of the screen frame; provide a series of sliding corner end parts providing at least one sliding length change to each profile section using the bias spring; determine a building frame heigh and building frame width of the building opening; produce profile sections by taking the building frame height and building frame width, respectively and reduce these with less than the bias range; assemble the screen frame, and attach a screen mesh to the screen frame.

15. A kit of parts comprising a series of sliding corner parts and at least one length or end of profile section of any one of the preceding claims.

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