Window frame made from reinforced extruded profiles

Abstract

Herein is disclosed a window frame (34, 35), such as for a roof window (42), comprising at least a top bar (19) and two side bars (17), wherein the top bar (19) is manufactured by extrusion of a profile (4) of one or more thermoplastic materials and the two side bars (17) are manufactured by extrusion of a profile (4) of one or more thermoplastic materials, wherein one or more reinforcement inserts (3) have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profile (4)s of the two side bars (17) comprise one or more discretely arranged extruded elongated reinforcement structures (25), which each comprises a reinforcement enclosure (23) connected to an interior side (33) of an external wall (26) of the side bar (17), the external wall (26) having an interior side (33) and an exterior side (28), wherein the reinforcement enclosures (23) of the side bars (17) each partly or fully encloses a reinforcement insert (3), wherein a corner joint (21, 22) is provided between each end of the top bar (19) and one of the top ends of the two side bars (17) to form a U-shaped frame part.

Description

[0001] A window frame part, such as for a roof window, is disclosed, in which at least the side bars are made from an extruded profile where one or more reinforcement inserts have been embedded in the thermoplastic material during the extrusion process.Background

[0002] Reinforcement of extruded profiles for window frames is well-known in the art, such as reinforcement by embedding a wire including a bundle of fibres jointed together by a thermosetting resin into the profile during extrusion as shown in US 4,740,405. Embedding of a plurality of bars, such as massive metal bars into such extruded profiles, e.g. by co-extruding or by subsequent insertion into the profile after extrusion of the profile, is disclosed in WO 2024 / 088752.

[0003] Patent application WO 2021 / 080445 A1 discloses a roof window equipped with reinforcing sections. Patent document US 6,427,415 B1 discloses a roof window comprising an insert that serves as a heat conducting insert and a reinforcing member. Patent application WO 2008 / 135048 A1 discloses a roof window comprising metal insertions that may serve to strengthen a plastic profile, and PL 232782 B1 discloses a roof window comprising a frame with metal reinforcement inserts.

[0004] The purpose of reinforcement of extruded profiles is to obtain the required strength with respect to load and torque bearing capability of the profile with less requirements to the thermoplastic material of the profile, which can lead to a reduced quantity of thermoplastic material in the profile, applicability of using thermoplastic material without a significant amount of reinforcing fibre material added, which can be problematic in recycling of the thermoplastic material and / or with less mechanical strength, which allows for use of a larger share of recycled materials in the thermoplastic material of the profile.

[0005] It is preferred to include the reinforcement as inserts that are entered into the profile during extrusion thereof, so-called co-extrusion, because the bonding and thereby the transfer of forces between the reinforcement inserts and the thermoplastic material will be optimal.

[0006] It is an object of the present invention to provide improved window frames or frame parts, made from top and side bars manufactured from such reinforced extruded profiles.Brief description of the present invention

[0007] The present invention relates to a window frame part, such as for a roof window, comprising at least a top bar and a side bar, wherein the top bar is manufactured by extrusion of a profile of one or more thermoplastic materials and the side bar is manufactured by extrusion of a profile of one or more thermoplastic materials, wherein one or more reinforcement inserts have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profile of the side bar comprises one or more discretely arranged extruded elongated reinforcement structures, which each comprises a reinforcement enclosure connected to an interior side of an external wall of the side bar, the external wall having an interior side and an exterior side, wherein the reinforcement enclosures of the side bar each partly or fully encloses a reinforcement insert, wherein a corner joint is provided between an end of the top bar and a top end of the side bar to form an L-shaped frame part.

[0008] The frame part according may further comprise a second side bar, wherein the second side bar is manufactured by extrusion of a profile of one or more thermoplastic materials, wherein one or more reinforcement inserts have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profiles of the two side bars comprise one or more discretely arranged extruded elongated reinforcement structures, which each comprises a reinforcement enclosure connected to an interior side of an external wall having an interior side and an exterior side, wherein the reinforcement enclosures of the side bars each partly or fully encloses a reinforcement insert, wherein a corner joint is provided between each end of the top bar and one of the top ends of the two side bars to form a U-shaped frame part.

[0009] The frame is according to one embodiment a fixation frame, and according to an alternative embodiment the frame is a sash frame.

[0010] It is preferred that the reinforcement inserts are fully embedded in the thermoplastic material of the extruded profile, i.e. that the cross-sectional perimeter of the reinforcement inserts is enclosed in the thermoplastic material of the extruded profile.

[0011] The thermoplastic material may comprise one, homogeneous material throughout the whole profile, or it may comprise different compositions of thermoplastic materials at different positions of the cross-section of the extruded profile. For instance, one composition comprising a predominantly contents of recycled thermoplastic material, such as 50 to 85% of recycled thermoplastic material, preferably more than 70% admixed with virgin thermoplastic material, and a second composition comprising a predominantly or exclusively content of virgin thermoplastic material, such as 75 to 100% of virgin thermoplastic material. Compositions comprising a larger contents of recycled thermoplastic material may be of a varying quality with respect to mechanical properties and visual appearance. For that reason, it is preferred that the exterior surface of the profile which will be visible in the final, installed frame is made from a composition of a predominantly or exclusively virgin thermoplastic material, and at least some of the reinforcement inserts and preferably all reinforcement inserts are preferably embedded partly or fully in such predominantly or exclusively virgin thermoplastic material due to its more reliable mechanical properties.

[0012] A preferred thermoplastic material is polyvinyl chloride (PVC), such as unplasticized PVC (U-PVC) and it is preferred that at least some of the reinforcement inserts and preferably all reinforcement inserts are embedded partly or fully in chlorinated polyvinyl chloride (CPVC) or U-PVC, in particular predominantly or exclusively virgin CPVC or virgin U-PVC due to its excellent mechanical properties.

[0013] Other thermoplastic materials suitable for the manufacturing of the profiles include acrylonitrile styrene acrylate (ASA) material, polypropylene (PP), polyethylene terephthalate (PET), poly(methyl methacrylate) (PMMA) and thermoplastic polyurethane (TPU). The profile may be manufactured by co-extrusion of different compositions of thermoplastic materials, so that some sections are extruded in CPVC whereas other sections are extruded in e.g. ASA, but it is preferred that all thermoplastic materials of the profile are of a similar type, such as virgin CPVC or virgin U-PVC combined with recycled PVC, such that the profile can be recycled as one material.

[0014] The thermoplastic material of the manufactured profile may comprise strengthening fibres, such as glass fibres or carbon fibres or natural fibres such as wood fibres embedded in the material. The added amount of strengthening fibres may be between 5% and 40% by weight, such as between 10% and 30% by weight. It is understood that in some embodiments, the thermoplastic material may be substantially free from strengthening fibres and may e.g. comprise less than 2% or less than 1% strengthening fibres.

[0015] The reinforcement inserts are elongated elements with a Young's modulus, i.e. the tensile and compressive modulus of elasticity that is much higher than that of the extruded thermoplastic material in which it is embedded, such as at least 5 times higher, preferably in the range of 10 to 40 times higher. Preferred materials for the reinforcement inserts is metal, such as aluminium or steel, preferably provided as solid elements such as rods or plates. The rods may be of a cylindrical shape, alternatively of a square, rectangular or e.g. hexagonal cross-section. Alternatively, the reinforcement inserts made from metal may be in the form of metal wire rope or metal tubes, flat profiles, L-profiles or profiles of other designs.

[0016] Metal reinforcement inserts in the form of rods, plates or tubes are preferably preheated prior to being fed into the extrusion die to improve the adherence between the reinforcement inserts and the thermoplastic material, such as to a temperature in the range of 50 to 150 °C, such as in the range of 60 to 120 °C, in particularly in the range of 65 to 85 °C.

[0017] Surface adhesion between metal reinforcement inserts and the thermoplastic material may furthermore be improved with a surface pretreatment of the metal inserts, such as by plasma surface treatment or corona surface treatment. Alternatively or additionally, the metal inserts may be provided with a suitable coating prior to being fed into the extrusion die, such as a thermoplastic coating.

[0018] The cross-sectional area of the individual reinforcement insert is preferably in the range of 3 mm 2< to 15 mm 2< , such as in the range of 5 mm 2< to 12 mm 2< , in particular in the range of 7 mm 2< to 10 mm 2< .

[0019] Other reinforcement inserts may comprise a wire including a bundle of fibres, such as carbon fibres, Kevlar fibres, glass fibres, polyester fibres or natural fibres jointed together by e.g. a thermosetting resin to form a reinforcement insert.

[0020] In one embodiment of such window frame having two side bars, one side bar is less reinforced by reinforcement inserts than the other side bar. This is particularly relevant for fixation window frames intended to be mounted abutting a neighbour fixation frame of a window, such as a roof window, so that side bars of neighbouring fixation frames of neighbouring roof windows are fastened to each other. In that case, the fixation frame of a window of which one side bar is to be fastened to the building structure, such as a roof structure, is less reinforced that the side bar of the fixation frame to be fastened to a side bar of a neighbouring fixation frame of a window.

[0021] The reduced reinforcement could be reached by providing steel rod reinforcement inserts at some reinforcement enclosures in one side bar and e.g. a fibre material reinforcement insert at the corresponding reinforcement enclosures in the other side bar or no reinforcement inserts in one or more reinforcement enclosures of the other side bar, so that the less reinforced side bar comprises fewer reinforcement inserts that the other side bar.

[0022] In one embodiment, the top bar and the one or two side bars have been extruded through substantially identical extrusion dies, whereby the cross-sectional shape of the bars match in a mitre joint between side bar and top bar, such as straight 45° cuts of both bars being jointed together. In case the top bar and the side bar to be jointed together are of different dimensions, the angle of the cuts may deviate from 45°, such as in the range of 30 to 60°, to provide a mitre joint.

[0023] At least some and preferably all of the reinforcement inserts in the side and / or top bars extend preferably to a distance of at least 0.5 mm from a corner joint, such as at least 1 mm from a corner joint. In a preferred embodiment, at least all metal reinforcement inserts in the side and / or top bars extend to a distance of at least 0.5 mm from a corner joint, such as at least 1 mm from a corner joint. This is preferably obtained with a manufacturing of extruded profiles for the bars according to the novel method described below with reference to the figures, where the reinforcement inserts are fed intermittently into the extrusion die with mutual longitudinal distance between consecutive reinforcement inserts, such as of preferably at least 4 mm, such as at least 6 mm, preferably at least 10 mm. The mutual longitudinal distance is provided to allow room for a saw kerf and possibly an amount of the thermoplastic material between an end surface of a bar, such as a top bar or a side bar of a window frame and the end surface of the reinforcement insert embedded in the bar, e.g. for allowing welding of the end surface of the bar to another bar. Hereby, it is achieved that the bars can easily be formed by separating cuts through the extruded profile, passing through the profile passing through the mutual longitudinal distances between consecutive reinforcement inserts of the manufactured profile corresponding to each of the plurality of positions of reinforcement enclosures of the profile. Preferably, the end surfaces of the reinforcement inserts in the bars are embedded in the thermoplastic material of the corresponding reinforcement enclosure.

[0024] Providing corner joints by welding of the thermoplastic material of the profiles is much more straight forward when the reinforcement inserts are absent from the vicinity of the end cuts of the bars made from the extruded profile, as the presence of reinforcement inserts would constitute a potential obstacle to the melding and jointing of the thermoplastic material into a heat welted joint. It is preferred to use heat welding, but other types of welding, such as laser welding or welding by ultrasound are also applicable.

[0025] The reinforcement inserts are in one embodiment present at corresponding reinforcement enclosures in at least one side bar and in the top bar, whereby it is achieved that forces, such as bending and / or torque forces carried by the reinforcement inserts are well transferred at the corner joint. In a particular embodiment, the ends of such reinforcements inserts abut in the corner joint, which can be used for controlling the movement of the two bars towards each other in forming the corner joint, such as in a heat welding process, where the sudden increase in resistance to displacement of the bars caused by the abutment of the reinforcement inserts can be applied to determine that the correct position of the bars has been achieved.

[0026] In a particular embodiment, at least some of the reinforcement structures extend in the longitudinal direction and comprise a distal reinforcement enclosure and a proximate distancing part connecting the reinforcement enclosure with the interior side of the external wall, wherein the smallest distance in any cross-sectional direction of the profile between the reinforcement insert in one or more of the reinforcement structures and the exterior side of the external wall to which it is connected is at least 1.3 times the width of that external wall, such as at least 1.5 times, such as at least 2 times the width of that external wall.

[0027] The distancing part is provided to increase the distance between the reinforcement insert and the external wall so that the partly collapse of the reinforcement enclosure caused by the absence of a reinforcement insert will not affect the aesthetical appearance of the exterior surface of the external wall, which may be visible when the frame is assembled.

[0028] The width of the distancing part in the cross-sectional direction of the profile is preferably at least 70% of the width of the external wall to which it is connected, such at least 100%, such as within 70 to 130 % of the width of the external wall to which it is connected, preferably within 85 to 120 %.

[0029] The corner joints may be provided as chemical joints, in particular as welded joints or as mechanically or chemically glued joints. The welding is preferably heat welding, but other types of welding, such as laser welding or welding by ultrasound are also applicable.

[0030] Alternatively or additionally, the corner joints may be provided as corner key joints, wherein each bar of a joint is fastened to a common corner key. In particular, reinforcement inserts of the side bar and / or the top bar may abut one or more abutment surfaces of the corner key.

[0031] According to one embodiment, one or more reinforcement inserts have been partly or fully embedded in the thermoplastic material of the top bar during the extrusion process.

[0032] The cross-sectional position of at least one of the reinforcement inserts of the top bar, preferably at least two reinforcement inserts, corresponds in a preferred embodiment to the cross-sectional position of reinforcement inserts of the side bar or bars. It would be advantageous that each corner joint between the top bar and one of the side bars includes a rigid connection between at least a part of the reinforcement structures of the top bar that encloses a reinforcement insert and the corresponding reinforcement structures of the side bar. Hereby, the mechanical connection between the two bars and the transfer of forces through the corresponding reinforcement inserts would be improved.

[0033] In other embodiments, the top bar does not include embedded reinforcement inserts.

[0034] One or more of the reinforcement inserts in a side bar may be local reinforcement inserts, the longitudinal extend of the local reinforcement inserts being less than 50% of the longest longitudinal extend of the side bar, such as less than 30 cm. Such local reinforcement inserts are placed to provide for local support for fittings of the window frame made from the manufactured profile, such as hinges, handles and locks.

[0035] At least one of the reinforcement inserts of the side bars and / or the top bar extends preferably to less than 5 mm from the corner joint between the top bar and one of the side bars, such as less than 3 mm, preferably less than 2 mm, so that the reinforcement provided by the reinforcement inserts extends close to the corner joint.

[0036] The top bar may be is less reinforced by the reinforcement inserts than the two side bars, since for windows with side hinges, such as central pivot hinges, the mechanical strain on the side bars is much more significant than the strain on the top and bottom bars.

[0037] The difference in reinforcement by reinforcement inserts between the side bars and the top bar could be obtained by e.g. providing solid steel elements, such as rods at some insertion positions of the side profiles and e.g. fibre material in the top bar or that no reinforcement inserts are fed some to some of the reinforcement structures in the manufacturing of the profile for the top bar. In particular, the top bar may comprise fewer reinforcement inserts that the side bar or bars.

[0038] It is preferred that at least some of the reinforcement inserts are made from metal, such as steel.

[0039] The reinforcement inserts are preferably solid rods.

[0040] In one embodiment, one or more of the reinforcement enclosures of the bars are of a non-uniform cross-section shape in the longitudinal direction of the bar due to reinforcement inserts of a shorter length than the longitudinal extend of the bar at the position of the reinforcement enclosure, i.e. the opening for the reinforcement insert in the reinforcement enclosure has collapsed in the extrusion process at the positions where the insert is absent.

[0041] The side bar or bars have preferably an upper end which is cut at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction of the profile and perpendicular to a longitudinal direction of the profile, and the top bar being cut at both ends at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction of the profile and perpendicular to a longitudinal direction of the profile.

[0042] The finished window frame includes normally a bottom bar and the two side bars are jointed, such as welded together with the bottom bar to form a rectangular frame.

[0043] The properties of the extruded material of a reinforcement structure and the extruded material of the external wall to which the reinforcement structure is connected is substantially identical at the corner joint between the top bar and any of the side bars.Brief description of the figures

[0044] Different embodiments of the present disclosure are shown in the accompanying figures, of which Fig. 1 is a top view of an extruder for manufacturing a profile, Fig. 2 is a top view of a production line including the extruder of Fig. 1, Fig. 3 is a top view of a first extruded profile, Fig. 3a is a detail of Fig. 3, Fig. 3b is a detail of Fig. 3a, Fig. 4 is a top view of a second extruded profile, Fig. 4a is a detail of Fig. 4, Fig. 4b is a detail of Fig. 4a, Fig. 5 is a top view of a third extruded profile, Fig. 5a is a detail of Fig. 5, Fig. 6 is a top view of a fourth extruded profile, Fig. 6a is a detail of Fig. 6, Fig. 6b is a detail of Fig. 6a, Fig. 7 shows two bar with end surfaces extending at opposing 45°, Fig. 8 shows a glued corner joint, Fig. 8a is a detail of Fig. 8, Fig. 9 shows a first welded corner joint, Fig. 9a is a detail of Fig. 9, Fig. 9b is a detail of Fig. 9a, Fig. 10 shows a second welded corner joint, Fig. 10a is a detail of Fig. 10, Fig. 10b is a detail of Fig. 10a, Fig. 11 is a detail of a longitudinal section of an extruded profile, Fig. 12 is a detail of a longitudinal section of an extruded profile, Fig. 13 is a cross-section detail of A-A in Figs. 11 and 12, showing a partly collapsed reinforcement enclosure, Fig. 14 is a cross-sectional view at D-D of Fig. 15 showing a cross-section of a reinforcement enclosure with a distancing part, Fig. 15 is a longitudinal sectional view at A-A of Fig. 14 from the top of a welded corner joint of a frame, Fig. 16 is a longitudinal sectional view at B-B of Fig. 14 from the top of a welded corner joint of a frame, Fig. 17 is a longitudinal sectional view at C-C of Fig. 14 from the top of a welded corner joint of a frame, Fig. 18 is a longitudinal sectional view at A-A of Fig. 14 from the top of a glued corner joint of a frame, Fig. 19 shows a cross-section of a second embodiment of a reinforcement enclosure with a distancing part, Fig. 20 shows a cross-section of a third embodiment of a reinforcement enclosure with a distancing part, Fig. 21 shows a cross-section of a fourth embodiment of a reinforcement enclosure with a distancing part, Fig. 22 shows a cross-section of a first sash frame with a glazing unit, Fig. 23 shows a cross-section of the first sash frame of Fig. 22 with a corresponding fixation frame, Fig. 24 shows a cross-section of a second sash frame with a glazing unit having reinforcement enclosures with a distancing part, Fig. 24a is a detail of a reinforcement enclosure with a distancing part of Fig. 24, Fig. 25 shows a cross-section of the second sash frame of Fig. 24 with a corresponding fixation frame, Fig. 26 shows a cross-section of a third sash frame with a glazing unit having reinforcement enclosures with a distancing part and with a corresponding fixation frame, and having local reinforcement inserts for supporting hinges, Fig. 27 shows a cross-section of a fourth sash frame with a glazing unit having reinforcement enclosures with a distancing part and with a corresponding fixation frame, and having local reinforcement inserts for supporting hinges, Fig. 28 shows a cross-section of a fifth sash frame with a glazing unit having reinforcement structures and with a corresponding fixation frame, Fig. 29 shows a cross-section of a sixth sash frame with a glazing unit having reinforcement enclosures with a distancing part and with a corresponding fixation frame, Fig. 30 is a front view of a first window frame, Fig. 31 is a front view of a second window frame, Fig. 32 is a perspective view of a roof window, Fig. 33 is a cross-section of a reinforced profile for a bottom bar of a roof window, and Fig. 34 is an illustration of a house in which two roof windows are installed, Detailed description of the invention

[0045] An extruder 1 arranged for manufacturing the reinforced profile for window frames is shown in Fig. 1. The extruder 1 comprises an extrusion die 2, which includes a plurality of insert positions (now shown) allowing reinforcement inserts 3 to be fed into the extruded profile 4 during the extrusion process by an insert feeder 5 arranged at an inlet side of the extrusion die 2. A guide 5a is arranged between the insert feeder 5 and the extrusion die 2 to stabilise the position and direction of the reinforcement inserts 3.

[0046] The insert feeder 5 is controlled to feed the reinforcement inserts 3 to the specific insert positions intermittently so as to provide a predetermined longitudinal distance 6 between consecutive reinforcement inserts 3 in the manufactured profile 4. According to one embodiment, consecutive reinforcement inserts 3 for the specific insert position are fed end-to-end into the extrusion die 2 and the feeding of the subsequent of the reinforcement inserts 3 is temporarily delayed to provide for the predetermined longitudinal distance 6 between the consecutive reinforcement inserts 3 in the manufactured profile 4 while keeping the inlet side of the insert position of the extrusion die 2 blocked to prevent false air to be sucked into the extrusion die 2.

[0047] A reinforcement insert supply system (not shown) is provided to supply the insert feeder 5 with the appropriate reinforcement inserts 3.

[0048] A heated screw feeder 7 is arranged at the inlet side of the extrusion die 2 feeding thermoplastic raw material in the form of granulates or powder from the material hopper 8 into the extrusion die 2.

[0049] The production line 9 for manufacturing the extruded profiles 4 is shown in a top view in Fig. 2, including the extruder 1 of Fig. 1. Downstream of the extruder 1 is arranged a cooling unit 10 and may also comprise a vacuum unit, wherein in the cooling unit the extruded profile 4 is cooled by means of cooling water while the shape of the profile 4 is stabilised until the temperature is lowered to a degree where the thermoplastic material has reached a form-stable state. Downstream of the cooling unit 10 is arranged a haul-off unit 11 provided with two endless haul-off belts 12 contacting opposing sides of the extruded profile 4 and providing a traction force to the extruded profile 4 to ensure a constant extrusion speed and thereby a homogeneous quality of the extruded profile 4. Downstream of the haul-off unit 11, cutting units (not shown) and / or other post-processing units may be arranged.

[0050] A first extruded profile 4 is shown in Figs. 3 and 3a, where the embedded reinforcement inserts 3 are indicated with dashed lines. The longitudinal distances 6 between consecutive reinforcement inserts are arranged so that cutting zones 13 are formed, allowing for straight separating cuts 14 to be made across the manufactured profile 4 passing through the mutual longitudinal distances 6 between consecutive reinforcement inserts 3. The cutting zones 13 of the first extruded profile 4 are formed to allow for two mirrored straight separating cuts 14 to be made in the cutting zone 13, wherein each mirrored straight separating cut 14 form an angle of 45° to the transversal direction 15 of the manufactured profile 4 in each direction from a transversal direction of the cutting zone 13, forming a V shaped notch with a 90° angle. For other applications, such as for e.g. hexagonal window frames or for right corner joints between profiles of different width, other angles, typically between 30 and 60° may be used, forming a V shaped notch in the range of 60 to 120°. This provides for a bar of a window frame, where the corner joints at both ends of the bar are mitre joints as shown e.g. in Figs. 8 and 9.

[0051] In Fig. 3b, which is a detail of Fig. 3a, is shown the distance D1 from an end surface 16 of a reinforcement insert 3 to the separating cut 14, which in the present example is 3 mm, leaving sufficient material between the end surface 16 and the separating cut 14 for a welded corner joint, so that the end surface 16 of a reinforcement insert 3 will be 1-2 mm from the welded joint. The distance D1 may be larger or lower, in particularly lower in case the profile 4 is intended to be assembled into a window frame by glued joints.

[0052] A second extruded profile 4 is shown in Figs. 4 and 4a, where the embedded reinforcement inserts 3 are indicated with dashed lines. The cutting zone 13 to the right provides room for two straight separating cuts 14 forming a V-shaped notch as shown in Fig. 3. The cutting zone 13 on the left is perpendicular to the longitudinal extent of the manufactured profile and is parallel to the transversal direction 15 of the profile 4.

[0053] In Fig. 4b is shown a detail of Fig. 4b, where the distance D1 between the end surface 16 of a reinforcement insert 3 to the separating cut 14 is indicated.

[0054] A third extruded profile 4 is shown in Figs. 5 and 5a, which closely resembles the profile 4 shown in Figs. 3, 3a and 3b, except that some reinforcement inserts 103 passes through the cutting zones 13. The reinforcement inserts 103 passing through the cutting zones 13 are not made from steel, preferably not made from metal, but are instead reinforcement inserts comprising a wire including a bundle of non-metal fibres, such as carbon fibres, Kevlar fibres, glass fibres, polyester fibres or natural fibres jointed together by e.g. a thermosetting resin to form an reinforcement insert, since such reinforcement inserts 103 can be cut with a cutting instrument, such as a circular saw, without causing heating damage to the material embedding the reinforcement insert 103.

[0055] A fourth extruded profile 4 is shown in a top view in Figs. 6, 6a and 6b, and the profile 4 resembles the third profile 4 shown in Figs. 5 and 5a, except that it furthermore includes local reinforcement inserts 203, which only extend a smaller distance as compared to the longest longitudinal extend of the bar Lmax, in particular less than 50% of the longest longitudinal extend of the bar Lmax. The local reinforcement inserts 203 reinforces the profile 4 at local placed to provide for local support for fittings of the window frame made from the manufactured profile 4, such as hinges, handles and locks. The distance D2 between the end surface 16 of the local reinforcement insert 203 and the cutting zone 13 is indicated on Fig. 6a.

[0056] Fig. 7 shows a side bar 17 and a top bar 19 for a frame with end surfaces 18, 20 extending at opposing 45°, which are suited for being jointed in a mitre joint. The two bars 17, 19 are made from identical profiles 4 with the same number of reinforcement inserts 3 at the same positions in reinforcement structures of the profile 4. In other embodiments, the top bar 19 have fewer reinforcement inserts 3 that the side bar 17, leaving some reinforcement structures empty.

[0057] Fig. 8 shows a corner joint between a top bar 19 and a side bar 17, wherein a thin layer of a suitable glue 21 is applied between the end surfaces 18, 20 of the bars 17, 19. The glue 21 may be e.g. a hot melt glue or an epoxy resin glue, such as a two-component glue. The distance D3 indicated in the detail of Fig. 8a from the end surface 16 of a reinforcement insert 3 to the glued corner joint 21 is in this case equal to the distance D1 between the end surface 16 of a reinforcement insert 3 and the separating cut 14.

[0058] A first welded corner joint 22, preferably by heat welding, between a top bar 19 and a side bar 17 is shown in Figs. 9, 9a and 9b, where the joint 22 consists of melted material of the top bar 19 and the side bar 17, which is manufactured by pressing the end surfaces 18, 20 of the top bar 19 and the side bar 17 towards a heated surface to soften a layer of material on both end surfaces 18, 20 sufficiently to provide for a heat welding of the two end surface 18, 20 when subsequently being pressed towards each other. The distance D3 indicated in the detail of Fig. 9b between the end surface 16 of a reinforcement insert 3 and the heat welded corner joint 22 is in this case less that the distance D1 between the end surface 16 of a reinforcement insert 3 and the separating cut 14 made when forming the bar 17, 19 because material of the bar 17, 19 has been used to form the heat welded joint 22.

[0059] A second welded corner joint 22 is shown in Figs. 10, 10a and 10b, where the reinforcement inserts 3 of the side bar 17 and the top bar 19 at corresponding reinforcement structures of the two bars 17, 19 are designed to collide during the welding process, here the colliding end surfaces 16 of the reinforcement inserts are shown with 45° matching surfaces, but they may have any other suitable shape. Thus, the distance D1 of the bars 17, 19 prior to the step of welding of the corner joint 22 is equal to the thickness of material which is softened to form the welded corner joint 22.

[0060] Fig. 11 is a detail of a longitudinal section of an extruded profile 4, where a local reinforcement insert 203 is embedded in a reinforcement enclosure 23 connected by a distancing part 24 of the reinforcement structure 25 to an external wall 26 of the profile 4.

[0061] Fig. 12 is a detail of a longitudinal section of an extruded profile 4, where a mutual longitudinal distance 6 between consecutive reinforcement inserts 3 form part of a cutting zone 13 of the profile 4 in which a straight separating cut 14 can be placed. The reinforcement inserts 3 are embedded in a reinforcement structure 25 comprising a reinforcement structure 23 connected by its distancing part 24 to an external wall 26 of the profile 4, similarly to the reinforcement structure 25 shown in Fig. 11.

[0062] Fig. 13 is a cross-section detail of A-A in Figs. 11 and 12, both sections going through a partly collapsed reinforcement enclosure 23 of the reinforcement structure 25, which comprises a reinforcement enclosure 23 for enclosing the reinforcement insert 3 and a distancing part 24 connecting to the external wall 26. The outer surface 27 of the reinforcement enclosure 23 is partly collapsed at the position of the section A-A, which is clearly shown in Fig. 13, whereas the outer surface 27 at a distance from the A-A section is not collapsed because a reinforcement insert 3 is present, for which reason the cross-section of Fig. 13 shows the outer surface 27 in a non-collapsed as well as in a partly collapsed state. The distancing part 24 is provided to increase the distance between the reinforcement insert 3 and the external wall 26 so that the partly collapse of the reinforcement enclosure 23 caused by the absence of an reinforcement insert 3, such as at the two A-A sections of Figs. 11 and 12, will not affect the aesthetical appearance of the exterior surface 28 of the external wall 26, which will be visible when the window frame is assembled.

[0063] Different sections of a frame corner between a side bar 17 and a top bar 19 with a welded joint 22 are shown in Figs. 14 to 17,

[0064] Fig. 14 is a cross-sectional view at D-D of Figs. 15, 16 and 17 showing a cross-section of a reinforcement structure 25 with a reinforcement enclosure 23 and a distancing part 24 connecting the reinforcement structure 25 with the outer wall 26 of the profile 4, and Figs. 15, 16 and 17 are longitudinal sectional views at A-A , B-B and C-C, respectively, of Fig. 14 from the top of a welded corner joint 22 of a frame.

[0065] In Fig. 14, the surfaces 27 of both the outer wall 27 of the reinforcement enclosure 23, the outer wall of the distancing part 24 and the inner surface 33 of the external wall 26 of the profile 4 are shown in smooth lines as well as uneven lines, representing the shape of the surfaces at the position of the section D-D as well as the surfaces at the contact with the welded joint 22.

[0066] A reinforcement insert 3 is embedded in the reinforcement enclosure 23 of the side bar 17 as well as the top bar 19, and it is it is apparent from the Fig. 15 that the reinforcement inserts 3 end before the welded joint 22. The distance D3 between the end surface 16 of the reinforcement insert 3 and the welded joint 22, which is shown in Fig. 9b, has not been indicated in Figs. 15, 16 and 17. The end surface 16 of the reinforcement inserts 3 is shown as being perpendicular to the longitudinal direction of the of the reinforcement inserts 3. Alternatively, the end surface 16 of the reinforcement insert 3 may be rounded or have an angle, such as 45° with the longitudinal direction.

[0067] In Fig. 15, the reinforcement structure 25 is seen in a section A-A from above the reinforcement enclosure 23, and the hidden reinforcement insert 3 is indicated with a broken line. In Fig. 16, the section B-B through the reinforcement enclosure 23 as well as the reinforcement insert 3 is shown.

[0068] Section C-C through the distancing part 24 is shown in Fig. 17 as viewed towards the reinforcement enclosure 23, the outer surface 27 of which is visible in the figure. The reinforcement insert 3 is hidden and is indicated with a broken line.

[0069] Fig. 18 is a longitudinal sectional view similar to the view in Fig. 15 at A-A of Fig. 14 from the top but with a of a glued corner joint 21 instead of a welded joint 22.

[0070] Three cross-sections of different embodiments of a reinforcement structure 25 with a reinforcement enclosure 23 and a distancing part 24 connected to an external wall 26 of a profile 4 are shown in Figs. 19, 20 and 21, which deviates from the embodiment shown in Figs. 13 and 14.

[0071] In the embodiment shown in Fig. 19, the distancing part 24 of the reinforcement structure 25 has the same width as the reinforcement enclosure 23, which provides for a stronger and more stiff connection between the reinforcement insert 3 and the external wall 26 of the profile 4, for which reason a larger force can be transferred between the two without risking damages to the structures of the reinforcement enclosure 23 or the distancing part 24. In the embodiment shown in Fig. 20, an opening 29 has been provided in the distancing part 24 of the reinforcement structure 25, providing most of the benefits of the wide distancing part 24 shown in Fig. 19 but with the use of less thermoplastic materials.

[0072] The reinforcement enclosure 23 of the reinforcement structure 25 shown in cross-section in Fig. 21 comprises a longitudinal slit 30 in the reinforcement enclosure 23 going from the external surface 27 of the reinforcement enclosure to the reinforcement insert 3, whereby the reinforcement insert 3 is only partly embedded in the thermoplastic material of the reinforcement enclosure 23. Hereby, the use of thermoplastic material is reduced as compared to the fully embedding reinforcement enclosure of e.g. Figs. 13 and 14.

[0073] A cross-section of a bar 17, 19 for a sash frame 34 is shown in Fig. 22 with a glazing unit 31 mounted to the bar 17, 19 on a glazing gasket 32. The profile 4 of the bar 17, 19 is reinforced with reinforcement inserts 3 arranged in reinforcement structures 25 embedding the reinforcement inserts 3 completely in the thermoplastic material of the profile 4, wherein the reinforcement structures 25 are placed on an inner surface 33 of the external wall 26 of the profile 4. The reinforcement inserts 3 are in this embodiment solid cylindrical rods with a diameter Di of 4 mm. The diameter Di is generally preferred to be in the range of 1 to 6 mm. The reinforcement structures 25 are formed so that the minimum distance Dm between the reinforcement inserts 3 and the exterior surface 28 of the external wall 26 of the profile 4 is substantially equal to the width Ww of the external wall 26 at the position of the reinforcement structure 25.

[0074] The sash frame 34 of Fig. 22 is shown in cross-section together with the corresponding fixation frame 35 in Fig. 23. The fixation frame 35 is reinforced with reinforcement inserts 3 placed in reinforcement structures 25 which fully embed the reinforcement inserts 3 in the thermoplastic material. The fixation frame 35 is made from an extruded profile 4 manufactured by a process similar to the profile 4 of the bars 17, 19 of the sash frame 34. The sash frame 34 and the fixation frame 35 constitutes parts of a roof window and are connected to each other by means of a central pivot hinge 36 comprising a sash hinge part 37 mounted on the sash frame 34 and a fixation hinge part 38 mounted on the fixation frame 35. A set of gaskets 39 are provided between the sash frame 34 and the fixation frame 35 to seal the slit between the two when the sash frame 34 is in a closed position.

[0075] A cross-section of a sash frame 34 is shown in Fig. 24, which is similar to the one shown in Figs. 22 and 23, except that some of the reinforcement structures 25 are formed with a reinforcement enclosure 23 embedding the reinforcement insert 3 and one or two distancing parts 24 connecting the reinforcement enclosure 23 with one or two external walls 26. The width Wd of the distancing part 24 of the reinforcement structures 25 are formed so that the minimum distance Dm between the reinforcement inserts 3 and the exterior surface 28 of the external wall 26 of the profile 4 is substantially equal to 2 times the width Ww of the external wall 26 at the position of the reinforcement structure 25 in order to prevent the partly collapse of the reinforcement enclosure 23 caused by the absence of an reinforcement insert 3 from affecting the aesthetical appearance of the exterior surface 28 of the external wall 26.

[0076] Fig. 25 shows a cross-section of the sash frame 34 of Fig. 24 with a corresponding fixation frame 35, of which some of the reinforcement structures 25 are formed with a reinforcement enclosure 23 embedding the reinforcement insert 3 and distancing parts 24 connecting the reinforcement enclosure 23 with external walls 26 of the profile 4.. The sash frame 34 and the fixation frame 35 constitutes parts of a roof window and are connected to each other by means of a central pivot hinge 36 comprising a sash hinge part 37 mounted on the sash frame 34 and a fixation hinge part 38 mounted on the fixation frame 35.

[0077] Fig. 26 shows a cross-section of a sash frame 34 with a glazing unit 31 and with a corresponding fixation frame 35, wherein some of the reinforcement structures 25 are provided with a reinforcement enclosure 23 and a distancing part 24, similarly to what is shown in Fig 25. Furthermore, the sash frame 34 as well as the fixation frame part 35 are provided with local reinforcement inserts 203 for supporting the sash hinge part 37 and the fixation hinge part 38, respectively. These local reinforcement inserts 203 strengthens the side bar 17 of the sash frame 34 as well as the fixation frame 35 at the point where the hinge 36 is attached. The longitudinal extend of the local reinforcement inserts 203 is about 25 cm.

[0078] Fig. 27 shows a cross-section of a sash frame 34 with a glazing unit 31 and with a corresponding fixation frame 35, wherein some of the reinforcement structures 25 are provided with a reinforcement enclosure 23 and a distancing part 24, similarly to what is shown in Fig 26. The sash frame 34 as well as the fixation frame part 35 are provided with local reinforcement inserts 203 for supporting the sash hinge part 37 and the fixation hinge part 38, respectively. However, this hinge 36 deviates from the hinge 36 shown in Fig. 26 in that a tongue-and-groove hinge 36 is provided, where the sash hinge part 37 and the fixation hinge part 38 each is provided with a tongue 40 to engage with a corresponding groove in the sash frame 34 and the fixation frame 35.

[0079] Fig. 28 shows a cross-section of another sash frame 34 with a glazing unit 31 and having reinforcement structures 25 for reinforcement inserts 3 and with a corresponding fixation frame 35.

[0080] Fig. 29 shows a cross-section of a sash frame 34 with a glazing unit 31 and a fixation frame 35, similar to the one shown in Fig. 28, wherein some of the reinforcement structures 25 comprises a reinforcement enclosure 23 and a distancing part 24.

[0081] Fig. 30 is a front view of a window frame 34, 35, where the side bars 17, the top bar 19 as well as the bottom bar 41 have 45° separating cuts at both ends, for which reason all four corner joints are mitre joints. A different window frame 34, 35 is shown in Fig. 31, where the side bars 17 have a 45° separating cut at the upper end and a straight cut at the lower end, matching corresponding straight cuts of the ends of the bottom bar 41.

[0082] Fig. 32 is a perspective view of a roof window 42 according to embodiments of the present disclosure. The roof window 42 may also be known as a skylight. The roof window 42 comprises a frame arrangement with a fixation frame 35 and a movable sash frame 34. The sash frame 34 provides a support of an insulating glass unit 31. The fixation frame 35 is configured to be arranged to cover (together with the sash frame 34) a building aperture 43 in the roof structure 44, and the fixation frame 35 is configured to be attached / fixated to a roof structure 44 of a building 45.

[0083] Fig. 33 is a cross-section of a reinforced profile for a bottom bar 41 for a frame 34, 35 of a roof window 42, such as a movable sash frame 34 of a roof window 42 or a fixation frame 35. The glass unit 31 will overlap the upper side of the bottom bar 41 as it is shown on the figure, and the glass unit 31 has been omitted from the figure to improve figure simplicity. Reinforcement inserts 3 are situated in reinforcement structures 25 embedding the reinforcement inserts 3 completely in the thermoplastic material of the profile 4, wherein the reinforcement structures 25 are placed on an inner surface 33 of the external wall 26 of the profile 4.

[0084] Fig. 34 is an illustration of a building 45 in which two roof windows 42 are installed in a roof structure 44 to cover building apertures 43 in the roof structure 44.References

[0085] 1Extruder 2Extrusion die 3Reinforcement insert 103Reinforcement inserts passing cutting zones 203Local reinforcement inserts 4Extruded profile 5Insert feeder 5aGuide 6Longitudinal distance between consecutive reinforcement inserts 7Screw feeder 8Material hopper 9Production line 10Cooling unit 11Haul-off unit 12Haul-off belts 13Cutting zone 14Straight separating cuts 15Transversal direction of profile 16End surface of reinforcement insert 17Side bar of frame 18End surface of side bar 19Top bar of frame 20End surface of top bar 21Glue joint 22Welded joint 23Reinforcement enclosure 24Distancing part 25Reinforcement structure 26External wall of profile 27Outer surface of reinforcement enclosure 28Exterior surface of external wall 29Opening in distancing part of reinforcement structure 30Longitudinal slit in reinforcement enclosure 31Glazing unit 32Glazing gasket 33Inner surface of external wall 34Sash frame 35Fixation frame 36Central pivot hinge 37Sash hinge part 38Fixation hinge part 39Set of gaskets between sash frame and fixation frame 40Tongue 41Bottom bar of frame 42Roof window 43Building aperture 44Roof structure 45Building D1Distance from end surface of reinforcement insert to separating cut D2Distance between end surface of local reinforcement insert and cutting zone D3Distance from the end surface of reinforcement insert to glued or welded corner joint DiDiameter of reinforcement insert DmMinimum distance between reinforcement insert and exterior surface of external wall. Int.Interior side of roof window Ext.Exterior side of roof window LmaxLongest longitudinal extend of bar WwWidth of external wall WdWidth of distancing part Items

[0086] 1. A window frame part, such as for a roof window (42), comprising at least a top bar (19) and a side bar (17), wherein the top bar (19) is manufactured by extrusion of a profile (4) of one or more thermoplastic materials and the side bar (17) is manufactured by extrusion of a profile (4) of one or more thermoplastic materials, wherein one or more reinforcement inserts (3) have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profile (4) of the side bar (17) comprises one or more discretely arranged extruded elongated reinforcement structures (25), which each comprises a reinforcement enclosure (23) connected to an interior side (33) of an external wall (26) of the side bar (17), the external wall (26) having an interior side (33) and an exterior side (28), wherein the reinforcement enclosures (23) of the side bar (17) each partly or fully encloses a reinforcement insert (3), wherein a corner joint (21, 22) is provided between an end of the top bar (19) and a top end of the side bar (17) to form an L-shaped frame part. 2. A frame (34, 35), such as for a window (42), comprising a frame part according to item 1, further comprising a second side bar (17), wherein the second side bar (17) is manufactured by extrusion of a profile (4) of one or more thermoplastic materials, wherein one or more reinforcement inserts (3) have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profiles (4) of the two side bars (17) comprise one or more discretely arranged extruded elongated reinforcement structures (25), which each comprises a reinforcement enclosure (23) connected to an interior side (33) of an external wall (26) having an interior side (33) and an exterior side (28), wherein the reinforcement enclosures (23) of the side bars (17) each partly or fully encloses a reinforcement insert (3), wherein a corner joint (21, 22) is provided between each end of the top bar (19) and one of the top ends of the two side bars (17) to form a U-shaped frame part. 3. The frame (34, 35) according to item 2, wherein the frame is a fixation frame (35). 4. The frame (34, 35) according to item 2, wherein the frame is a sash frame (34). 5. The frame (34, 35) according to any of items 2 to 4, wherein one side bar (17) is less reinforced by reinforcement inserts (3) than the other side bar (17). 6. The frame (34, 35) according to item 5, wherein the less reinforced side bar (17) comprises fewer reinforcement inserts (3) that the other side bar (17). 7. The frame (34, 35) of frame part according to any of the preceding items, wherein the top bar (19) and the one or two side bars (17) have been extruded through substantially identical extrusion dies (2). 8. The frame (34, 35) or frame part according to any of the preceding items, wherein the reinforcement inserts (3) in the bars (17, 19) extend to a distance of at least 0.5 mm from a corner joint (21, 22), such as at least 1 mm from a corner joint (21, 22). 9. The frame (34, 35) according to any of the preceding items, wherein end surfaces (16) of the reinforcement inserts (3) in the bars (17, 19) are embedded in the thermoplastic material of the corresponding reinforcement enclosure (23). 10. The frame (34, 35) or frame part according to any of items 1 to 7, wherein reinforcement inserts (3) are present at corresponding reinforcement enclosures (23) in at least one side bar (17) and in the top bar (19), and wherein the ends (16) of such reinforcements inserts (3) abut in the corner joint (21, 22). 11. The frame (34, 35) or frame part according to any of the preceding items, wherein at least some of the reinforcement structures (25) comprise a distal reinforcement enclosure (23) and a proximate distancing part (24) connecting the reinforcement enclosure (23) with the interior side (33) of the external wall (26), wherein the smallest distance (Dm) in any cross-sectional direction of the profile (4) between the reinforcement insert (3) in one or more of the reinforcement structures (25) and the exterior side (28) of the external wall (26) to which it is connected is at least 1.3 times the width (Ww) of that external wall (26), such as at least 1.5 times, such as at least 2 times the width (Ww) of that external wall (26). 12. The frame (34, 35) or frame part according to item 11, wherein the width (Wd) of the distancing part (24) in the cross-sectional direction of the profile (4) is at least 70% of the width (Ww) of the external wall (26) to which it is connected, such at least 100%, such as within 70 to 130 % of the width (Ww) of the external wall (26) to which it is connected, preferably within 85 to 120 %. 13. The frame (34, 35) or frame part according to any of the preceding items, wherein the corner joints (21, 22) are provided as chemical joints (21, 22). 14. The frame (34, 35) or frame part according to item 13, wherein the corner joints (21, 22) are provided as welded joints (22), preferably heat welded. 15. The frame (34, 35) or frame part according to item 13, wherein the corner joints (21, 22) are provided as glued joints (21). 16. The frame (34, 35) or frame part according to item 13, wherein the corner joints are provided as corner key joints, wherein each bar (17, 19) of a joint is fastened to a common corner key. 17. The frame (34, 35) or frame part according to item 16, wherein reinforcement inserts (3) of the side bar (17) and / or the top bar (19) abut one or more abutment surfaces of the corner key. 18. The frame (34, 35) or frame part according to of any of the preceding items, wherein one or more reinforcement inserts (3) have been partly or fully embedded in the thermoplastic material of the top bar (19) during the extrusion process. 19. The frame (34, 35) or frame part according to item 18, wherein the cross-sectional position of at least one of the reinforcement inserts (3) of the top bar (19), preferably at least two reinforcement inserts (3), corresponds to the cross-sectional position of reinforcement inserts (3) of the side bar (17) or bars (17). 20. The frame (34, 35) or frame part according to item 19, wherein each corner joint (21, 22) between the top bar (19) and one of the side bars (17) includes a rigid connection between at least a part of the reinforcement structures (25) of the top bar (19) that encloses a reinforcement insert (3) and the corresponding reinforcement structures (25) of the side bar (17). 21. The frame (34, 35) or frame part according to any of the preceding items, wherein one or more of the reinforcement inserts (3, 203) in a side bar (17) are local reinforcement inserts (203), the longitudinal extend of the local reinforcement inserts (203) being less than 50% of the longest longitudinal extend (Lmax) of the side bar (17). 22. The frame (34, 35) or frame part according to any of the preceding items, wherein at least one of the reinforcement inserts (3) of the bars (17, 19) extends to less than 5 mm from the corner joint (21, 22) between the top bar (19) and one of the side bars (17), such as less than 3 mm, preferably less than 2 mm. 23. The frame (34, 35) or frame part according to any of the preceding items, wherein the top bar (19) is less reinforced by reinforcement inserts (3) than the one or two side bars (17). 24. The frame (34, 35) or frame part according to item 23, wherein the top bar (19) comprises fewer reinforcement inserts (3) that the side bar (17) or bars (17). 25. The frame (34, 35) or frame parts according to any of the preceding items, wherein at least some of the reinforcement inserts (3) are made from metal, such as steel. 26. The frame (34, 35) or frame parts according to any of the preceding claims, wherein the reinforcement inserts (3) are solid rods. 27. The frame (34, 35) or frame parts according to any of the preceding items, wherein one or more of the reinforcement enclosures (23) of the bars (17, 19) are of a non-uniform cross-sectional shape in the longitudinal direction of the bar (17, 19) due to reinforcement inserts (3) of a shorter length than the longitudinal extend of the bar (17, 19) at the position of the reinforcement enclosure (23). 28. The frame (34, 35) or frame parts according to any of the preceding items, wherein the side bar (17) or bars (17) has an upper end which is cut at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction (15) of the profile (4) and perpendicular to a longitudinal direction of the profile (4), and the top bar (19) being cut at both ends at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction (15) of the profile (4) and perpendicular to a longitudinal direction of the profile (4).

Examples

Embodiment Construction

[0045]An extruder 1 arranged for manufacturing the reinforced profile for window frames is shown in Fig. 1. The extruder 1 comprises an extrusion die 2, which includes a plurality of insert positions (now shown) allowing reinforcement inserts 3 to be fed into the extruded profile 4 during the extrusion process by an insert feeder 5 arranged at an inlet side of the extrusion die 2. A guide 5a is arranged between the insert feeder 5 and the extrusion die 2 to stabilise the position and direction of the reinforcement inserts 3.

[0046]The insert feeder 5 is controlled to feed the reinforcement inserts 3 to the specific insert positions intermittently so as to provide a predetermined longitudinal distance 6 between consecutive reinforcement inserts 3 in the manufactured profile 4. According to one embodiment, consecutive reinforcement inserts 3 for the specific insert position are fed end-to-end into the extrusion die 2 and the feeding of the subsequent of the reinforcement inserts 3 is t...

[0001] A window frame part, such as for a roof window, is disclosed, in which at least the side bars are made from an extruded profile where one or more reinforcement inserts have been embedded in the thermoplastic material during the extrusion process.Background

[0002] Reinforcement of extruded profiles for window frames is well-known in the art, such as reinforcement by embedding a wire including a bundle of fibres jointed together by a thermosetting resin into the profile during extrusion as shown in US 4,740,405. Embedding of a plurality of bars, such as massive metal bars into such extruded profiles, e.g. by co-extruding or by subsequent insertion into the profile after extrusion of the profile, is disclosed in WO 2024 / 088752.

[0003] Patent application WO 2021 / 080445 A1 discloses a roof window equipped with reinforcing sections. Patent document US 6,427,415 B1 discloses a roof window comprising an insert that serves as a heat conducting insert and a reinforcing member. Patent application WO 2008 / 135048 A1 discloses a roof window comprising metal insertions that may serve to strengthen a plastic profile, and PL 232782 B1 discloses a roof window comprising a frame with metal reinforcement inserts.

[0004] The purpose of reinforcement of extruded profiles is to obtain the required strength with respect to load and torque bearing capability of the profile with less requirements to the thermoplastic material of the profile, which can lead to a reduced quantity of thermoplastic material in the profile, applicability of using thermoplastic material without a significant amount of reinforcing fibre material added, which can be problematic in recycling of the thermoplastic material and / or with less mechanical strength, which allows for use of a larger share of recycled materials in the thermoplastic material of the profile.

[0005] It is preferred to include the reinforcement as inserts that are entered into the profile during extrusion thereof, so-called co-extrusion, because the bonding and thereby the transfer of forces between the reinforcement inserts and the thermoplastic material will be optimal.

[0006] It is an object of the present invention to provide improved window frames or frame parts, made from top and side bars manufactured from such reinforced extruded profiles.Brief description of the present invention

[0007] The present invention relates to a window frame part, such as for a roof window, comprising at least a top bar and a side bar, wherein the top bar is manufactured by extrusion of a profile of one or more thermoplastic materials and the side bar is manufactured by extrusion of a profile of one or more thermoplastic materials, wherein one or more reinforcement inserts have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profile of the side bar comprises one or more discretely arranged extruded elongated reinforcement structures, which each comprises a reinforcement enclosure connected to an interior side of an external wall of the side bar, the external wall having an interior side and an exterior side, wherein the reinforcement enclosures of the side bar each partly or fully encloses a reinforcement insert, wherein a corner joint is provided between an end of the top bar and a top end of the side bar to form an L-shaped frame part.

[0008] The frame part according may further comprise a second side bar, wherein the second side bar is manufactured by extrusion of a profile of one or more thermoplastic materials, wherein one or more reinforcement inserts have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profiles of the two side bars comprise one or more discretely arranged extruded elongated reinforcement structures, which each comprises a reinforcement enclosure connected to an interior side of an external wall having an interior side and an exterior side, wherein the reinforcement enclosures of the side bars each partly or fully encloses a reinforcement insert, wherein a corner joint is provided between each end of the top bar and one of the top ends of the two side bars to form a U-shaped frame part.

[0009] The frame is according to one embodiment a fixation frame, and according to an alternative embodiment the frame is a sash frame.

[0010] It is preferred that the reinforcement inserts are fully embedded in the thermoplastic material of the extruded profile, i.e. that the cross-sectional perimeter of the reinforcement inserts is enclosed in the thermoplastic material of the extruded profile.

[0011] The thermoplastic material may comprise one, homogeneous material throughout the whole profile, or it may comprise different compositions of thermoplastic materials at different positions of the cross-section of the extruded profile. For instance, one composition comprising a predominantly contents of recycled thermoplastic material, such as 50 to 85% of recycled thermoplastic material, preferably more than 70% admixed with virgin thermoplastic material, and a second composition comprising a predominantly or exclusively content of virgin thermoplastic material, such as 75 to 100% of virgin thermoplastic material. Compositions comprising a larger contents of recycled thermoplastic material may be of a varying quality with respect to mechanical properties and visual appearance. For that reason, it is preferred that the exterior surface of the profile which will be visible in the final, installed frame is made from a composition of a predominantly or exclusively virgin thermoplastic material, and at least some of the reinforcement inserts and preferably all reinforcement inserts are preferably embedded partly or fully in such predominantly or exclusively virgin thermoplastic material due to its more reliable mechanical properties.

[0012] A preferred thermoplastic material is polyvinyl chloride (PVC), such as unplasticized PVC (U-PVC) and it is preferred that at least some of the reinforcement inserts and preferably all reinforcement inserts are embedded partly or fully in chlorinated polyvinyl chloride (CPVC) or U-PVC, in particular predominantly or exclusively virgin CPVC or virgin U-PVC due to its excellent mechanical properties.

[0013] Other thermoplastic materials suitable for the manufacturing of the profiles include acrylonitrile styrene acrylate (ASA) material, polypropylene (PP), polyethylene terephthalate (PET), poly(methyl methacrylate) (PMMA) and thermoplastic polyurethane (TPU). The profile may be manufactured by co-extrusion of different compositions of thermoplastic materials, so that some sections are extruded in CPVC whereas other sections are extruded in e.g. ASA, but it is preferred that all thermoplastic materials of the profile are of a similar type, such as virgin CPVC or virgin U-PVC combined with recycled PVC, such that the profile can be recycled as one material.

[0014] The thermoplastic material of the manufactured profile may comprise strengthening fibres, such as glass fibres or carbon fibres or natural fibres such as wood fibres embedded in the material. The added amount of strengthening fibres may be between 5% and 40% by weight, such as between 10% and 30% by weight. It is understood that in some embodiments, the thermoplastic material may be substantially free from strengthening fibres and may e.g. comprise less than 2% or less than 1% strengthening fibres.

[0015] The reinforcement inserts are elongated elements with a Young's modulus, i.e. the tensile and compressive modulus of elasticity that is much higher than that of the extruded thermoplastic material in which it is embedded, such as at least 5 times higher, preferably in the range of 10 to 40 times higher. Preferred materials for the reinforcement inserts is metal, such as aluminium or steel, preferably provided as solid elements such as rods or plates. The rods may be of a cylindrical shape, alternatively of a square, rectangular or e.g. hexagonal cross-section. Alternatively, the reinforcement inserts made from metal may be in the form of metal wire rope or metal tubes, flat profiles, L-profiles or profiles of other designs.

[0016] Metal reinforcement inserts in the form of rods, plates or tubes are preferably preheated prior to being fed into the extrusion die to improve the adherence between the reinforcement inserts and the thermoplastic material, such as to a temperature in the range of 50 to 150 °C, such as in the range of 60 to 120 °C, in particularly in the range of 65 to 85 °C.

[0017] Surface adhesion between metal reinforcement inserts and the thermoplastic material may furthermore be improved with a surface pretreatment of the metal inserts, such as by plasma surface treatment or corona surface treatment. Alternatively or additionally, the metal inserts may be provided with a suitable coating prior to being fed into the extrusion die, such as a thermoplastic coating.

[0018] The cross-sectional area of the individual reinforcement insert is preferably in the range of 3 mm 2< to 15 mm 2< , such as in the range of 5 mm 2< to 12 mm 2< , in particular in the range of 7 mm 2< to 10 mm 2< .

[0019] Other reinforcement inserts may comprise a wire including a bundle of fibres, such as carbon fibres, Kevlar fibres, glass fibres, polyester fibres or natural fibres jointed together by e.g. a thermosetting resin to form a reinforcement insert.

[0020] In one embodiment of such window frame having two side bars, one side bar is less reinforced by reinforcement inserts than the other side bar. This is particularly relevant for fixation window frames intended to be mounted abutting a neighbour fixation frame of a window, such as a roof window, so that side bars of neighbouring fixation frames of neighbouring roof windows are fastened to each other. In that case, the fixation frame of a window of which one side bar is to be fastened to the building structure, such as a roof structure, is less reinforced that the side bar of the fixation frame to be fastened to a side bar of a neighbouring fixation frame of a window.

[0021] The reduced reinforcement could be reached by providing steel rod reinforcement inserts at some reinforcement enclosures in one side bar and e.g. a fibre material reinforcement insert at the corresponding reinforcement enclosures in the other side bar or no reinforcement inserts in one or more reinforcement enclosures of the other side bar, so that the less reinforced side bar comprises fewer reinforcement inserts that the other side bar.

[0022] In one embodiment, the top bar and the one or two side bars have been extruded through substantially identical extrusion dies, whereby the cross-sectional shape of the bars match in a mitre joint between side bar and top bar, such as straight 45° cuts of both bars being jointed together. In case the top bar and the side bar to be jointed together are of different dimensions, the angle of the cuts may deviate from 45°, such as in the range of 30 to 60°, to provide a mitre joint.

[0023] At least some and preferably all of the reinforcement inserts in the side and / or top bars extend preferably to a distance of at least 0.5 mm from a corner joint, such as at least 1 mm from a corner joint. In a preferred embodiment, at least all metal reinforcement inserts in the side and / or top bars extend to a distance of at least 0.5 mm from a corner joint, such as at least 1 mm from a corner joint. This is preferably obtained with a manufacturing of extruded profiles for the bars according to the novel method described below with reference to the figures, where the reinforcement inserts are fed intermittently into the extrusion die with mutual longitudinal distance between consecutive reinforcement inserts, such as of preferably at least 4 mm, such as at least 6 mm, preferably at least 10 mm. The mutual longitudinal distance is provided to allow room for a saw kerf and possibly an amount of the thermoplastic material between an end surface of a bar, such as a top bar or a side bar of a window frame and the end surface of the reinforcement insert embedded in the bar, e.g. for allowing welding of the end surface of the bar to another bar. Hereby, it is achieved that the bars can easily be formed by separating cuts through the extruded profile, passing through the profile passing through the mutual longitudinal distances between consecutive reinforcement inserts of the manufactured profile corresponding to each of the plurality of positions of reinforcement enclosures of the profile. Preferably, the end surfaces of the reinforcement inserts in the bars are embedded in the thermoplastic material of the corresponding reinforcement enclosure.

[0024] Providing corner joints by welding of the thermoplastic material of the profiles is much more straight forward when the reinforcement inserts are absent from the vicinity of the end cuts of the bars made from the extruded profile, as the presence of reinforcement inserts would constitute a potential obstacle to the melding and jointing of the thermoplastic material into a heat welted joint. It is preferred to use heat welding, but other types of welding, such as laser welding or welding by ultrasound are also applicable.

[0025] The reinforcement inserts are in one embodiment present at corresponding reinforcement enclosures in at least one side bar and in the top bar, whereby it is achieved that forces, such as bending and / or torque forces carried by the reinforcement inserts are well transferred at the corner joint. In a particular embodiment, the ends of such reinforcements inserts abut in the corner joint, which can be used for controlling the movement of the two bars towards each other in forming the corner joint, such as in a heat welding process, where the sudden increase in resistance to displacement of the bars caused by the abutment of the reinforcement inserts can be applied to determine that the correct position of the bars has been achieved.

[0026] In a particular embodiment, at least some of the reinforcement structures extend in the longitudinal direction and comprise a distal reinforcement enclosure and a proximate distancing part connecting the reinforcement enclosure with the interior side of the external wall, wherein the smallest distance in any cross-sectional direction of the profile between the reinforcement insert in one or more of the reinforcement structures and the exterior side of the external wall to which it is connected is at least 1.3 times the width of that external wall, such as at least 1.5 times, such as at least 2 times the width of that external wall.

[0027] The distancing part is provided to increase the distance between the reinforcement insert and the external wall so that the partly collapse of the reinforcement enclosure caused by the absence of a reinforcement insert will not affect the aesthetical appearance of the exterior surface of the external wall, which may be visible when the frame is assembled.

[0028] The width of the distancing part in the cross-sectional direction of the profile is preferably at least 70% of the width of the external wall to which it is connected, such at least 100%, such as within 70 to 130 % of the width of the external wall to which it is connected, preferably within 85 to 120 %.

[0029] The corner joints may be provided as chemical joints, in particular as welded joints or as mechanically or chemically glued joints. The welding is preferably heat welding, but other types of welding, such as laser welding or welding by ultrasound are also applicable.

[0030] Alternatively or additionally, the corner joints may be provided as corner key joints, wherein each bar of a joint is fastened to a common corner key. In particular, reinforcement inserts of the side bar and / or the top bar may abut one or more abutment surfaces of the corner key.

[0031] According to one embodiment, one or more reinforcement inserts have been partly or fully embedded in the thermoplastic material of the top bar during the extrusion process.

[0032] The cross-sectional position of at least one of the reinforcement inserts of the top bar, preferably at least two reinforcement inserts, corresponds in a preferred embodiment to the cross-sectional position of reinforcement inserts of the side bar or bars. It would be advantageous that each corner joint between the top bar and one of the side bars includes a rigid connection between at least a part of the reinforcement structures of the top bar that encloses a reinforcement insert and the corresponding reinforcement structures of the side bar. Hereby, the mechanical connection between the two bars and the transfer of forces through the corresponding reinforcement inserts would be improved.

[0033] In other embodiments, the top bar does not include embedded reinforcement inserts.

[0034] One or more of the reinforcement inserts in a side bar may be local reinforcement inserts, the longitudinal extend of the local reinforcement inserts being less than 50% of the longest longitudinal extend of the side bar, such as less than 30 cm. Such local reinforcement inserts are placed to provide for local support for fittings of the window frame made from the manufactured profile, such as hinges, handles and locks.

[0035] At least one of the reinforcement inserts of the side bars and / or the top bar extends preferably to less than 5 mm from the corner joint between the top bar and one of the side bars, such as less than 3 mm, preferably less than 2 mm, so that the reinforcement provided by the reinforcement inserts extends close to the corner joint.

[0036] The top bar may be is less reinforced by the reinforcement inserts than the two side bars, since for windows with side hinges, such as central pivot hinges, the mechanical strain on the side bars is much more significant than the strain on the top and bottom bars.

[0037] The difference in reinforcement by reinforcement inserts between the side bars and the top bar could be obtained by e.g. providing solid steel elements, such as rods at some insertion positions of the side profiles and e.g. fibre material in the top bar or that no reinforcement inserts are fed some to some of the reinforcement structures in the manufacturing of the profile for the top bar. In particular, the top bar may comprise fewer reinforcement inserts that the side bar or bars.

[0038] It is preferred that at least some of the reinforcement inserts are made from metal, such as steel.

[0039] The reinforcement inserts are preferably solid rods.

[0040] In one embodiment, one or more of the reinforcement enclosures of the bars are of a non-uniform cross-section shape in the longitudinal direction of the bar due to reinforcement inserts of a shorter length than the longitudinal extend of the bar at the position of the reinforcement enclosure, i.e. the opening for the reinforcement insert in the reinforcement enclosure has collapsed in the extrusion process at the positions where the insert is absent.

[0041] The side bar or bars have preferably an upper end which is cut at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction of the profile and perpendicular to a longitudinal direction of the profile, and the top bar being cut at both ends at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction of the profile and perpendicular to a longitudinal direction of the profile.

[0042] The finished window frame includes normally a bottom bar and the two side bars are jointed, such as welded together with the bottom bar to form a rectangular frame.

[0043] The properties of the extruded material of a reinforcement structure and the extruded material of the external wall to which the reinforcement structure is connected is substantially identical at the corner joint between the top bar and any of the side bars.Brief description of the figures

[0044] Different embodiments of the present disclosure are shown in the accompanying figures, of which Fig. 1 is a top view of an extruder for manufacturing a profile, Fig. 2 is a top view of a production line including the extruder of Fig. 1, Fig. 3 is a top view of a first extruded profile, Fig. 3a is a detail of Fig. 3, Fig. 3b is a detail of Fig. 3a, Fig. 4 is a top view of a second extruded profile, Fig. 4a is a detail of Fig. 4, Fig. 4b is a detail of Fig. 4a, Fig. 5 is a top view of a third extruded profile, Fig. 5a is a detail of Fig. 5, Fig. 6 is a top view of a fourth extruded profile, Fig. 6a is a detail of Fig. 6, Fig. 6b is a detail of Fig. 6a, Fig. 7 shows two bar with end surfaces extending at opposing 45°, Fig. 8 shows a glued corner joint, Fig. 8a is a detail of Fig. 8, Fig. 9 shows a first welded corner joint, Fig. 9a is a detail of Fig. 9, Fig. 9b is a detail of Fig. 9a, Fig. 10 shows a second welded corner joint, Fig. 10a is a detail of Fig. 10, Fig. 10b is a detail of Fig. 10a, Fig. 11 is a detail of a longitudinal section of an extruded profile, Fig. 12 is a detail of a longitudinal section of an extruded profile, Fig. 13 is a cross-section detail of A-A in Figs. 11 and 12, showing a partly collapsed reinforcement enclosure, Fig. 14 is a cross-sectional view at D-D of Fig. 15 showing a cross-section of a reinforcement enclosure with a distancing part, Fig. 15 is a longitudinal sectional view at A-A of Fig. 14 from the top of a welded corner joint of a frame, Fig. 16 is a longitudinal sectional view at B-B of Fig. 14 from the top of a welded corner joint of a frame, Fig. 17 is a longitudinal sectional view at C-C of Fig. 14 from the top of a welded corner joint of a frame, Fig. 18 is a longitudinal sectional view at A-A of Fig. 14 from the top of a glued corner joint of a frame, Fig. 19 shows a cross-section of a second embodiment of a reinforcement enclosure with a distancing part, Fig. 20 shows a cross-section of a third embodiment of a reinforcement enclosure with a distancing part, Fig. 21 shows a cross-section of a fourth embodiment of a reinforcement enclosure with a distancing part, Fig. 22 shows a cross-section of a first sash frame with a glazing unit, Fig. 23 shows a cross-section of the first sash frame of Fig. 22 with a corresponding fixation frame, Fig. 24 shows a cross-section of a second sash frame with a glazing unit having reinforcement enclosures with a distancing part, Fig. 24a is a detail of a reinforcement enclosure with a distancing part of Fig. 24, Fig. 25 shows a cross-section of the second sash frame of Fig. 24 with a corresponding fixation frame, Fig. 26 shows a cross-section of a third sash frame with a glazing unit having reinforcement enclosures with a distancing part and with a corresponding fixation frame, and having local reinforcement inserts for supporting hinges, Fig. 27 shows a cross-section of a fourth sash frame with a glazing unit having reinforcement enclosures with a distancing part and with a corresponding fixation frame, and having local reinforcement inserts for supporting hinges, Fig. 28 shows a cross-section of a fifth sash frame with a glazing unit having reinforcement structures and with a corresponding fixation frame, Fig. 29 shows a cross-section of a sixth sash frame with a glazing unit having reinforcement enclosures with a distancing part and with a corresponding fixation frame, Fig. 30 is a front view of a first window frame, Fig. 31 is a front view of a second window frame, Fig. 32 is a perspective view of a roof window, Fig. 33 is a cross-section of a reinforced profile for a bottom bar of a roof window, and Fig. 34 is an illustration of a house in which two roof windows are installed, Detailed description of the invention

[0045] An extruder 1 arranged for manufacturing the reinforced profile for window frames is shown in Fig. 1. The extruder 1 comprises an extrusion die 2, which includes a plurality of insert positions (now shown) allowing reinforcement inserts 3 to be fed into the extruded profile 4 during the extrusion process by an insert feeder 5 arranged at an inlet side of the extrusion die 2. A guide 5a is arranged between the insert feeder 5 and the extrusion die 2 to stabilise the position and direction of the reinforcement inserts 3.

[0046] The insert feeder 5 is controlled to feed the reinforcement inserts 3 to the specific insert positions intermittently so as to provide a predetermined longitudinal distance 6 between consecutive reinforcement inserts 3 in the manufactured profile 4. According to one embodiment, consecutive reinforcement inserts 3 for the specific insert position are fed end-to-end into the extrusion die 2 and the feeding of the subsequent of the reinforcement inserts 3 is temporarily delayed to provide for the predetermined longitudinal distance 6 between the consecutive reinforcement inserts 3 in the manufactured profile 4 while keeping the inlet side of the insert position of the extrusion die 2 blocked to prevent false air to be sucked into the extrusion die 2.

[0047] A reinforcement insert supply system (not shown) is provided to supply the insert feeder 5 with the appropriate reinforcement inserts 3.

[0048] A heated screw feeder 7 is arranged at the inlet side of the extrusion die 2 feeding thermoplastic raw material in the form of granulates or powder from the material hopper 8 into the extrusion die 2.

[0049] The production line 9 for manufacturing the extruded profiles 4 is shown in a top view in Fig. 2, including the extruder 1 of Fig. 1. Downstream of the extruder 1 is arranged a cooling unit 10 and may also comprise a vacuum unit, wherein in the cooling unit the extruded profile 4 is cooled by means of cooling water while the shape of the profile 4 is stabilised until the temperature is lowered to a degree where the thermoplastic material has reached a form-stable state. Downstream of the cooling unit 10 is arranged a haul-off unit 11 provided with two endless haul-off belts 12 contacting opposing sides of the extruded profile 4 and providing a traction force to the extruded profile 4 to ensure a constant extrusion speed and thereby a homogeneous quality of the extruded profile 4. Downstream of the haul-off unit 11, cutting units (not shown) and / or other post-processing units may be arranged.

[0050] A first extruded profile 4 is shown in Figs. 3 and 3a, where the embedded reinforcement inserts 3 are indicated with dashed lines. The longitudinal distances 6 between consecutive reinforcement inserts are arranged so that cutting zones 13 are formed, allowing for straight separating cuts 14 to be made across the manufactured profile 4 passing through the mutual longitudinal distances 6 between consecutive reinforcement inserts 3. The cutting zones 13 of the first extruded profile 4 are formed to allow for two mirrored straight separating cuts 14 to be made in the cutting zone 13, wherein each mirrored straight separating cut 14 form an angle of 45° to the transversal direction 15 of the manufactured profile 4 in each direction from a transversal direction of the cutting zone 13, forming a V shaped notch with a 90° angle. For other applications, such as for e.g. hexagonal window frames or for right corner joints between profiles of different width, other angles, typically between 30 and 60° may be used, forming a V shaped notch in the range of 60 to 120°. This provides for a bar of a window frame, where the corner joints at both ends of the bar are mitre joints as shown e.g. in Figs. 8 and 9.

[0051] In Fig. 3b, which is a detail of Fig. 3a, is shown the distance D1 from an end surface 16 of a reinforcement insert 3 to the separating cut 14, which in the present example is 3 mm, leaving sufficient material between the end surface 16 and the separating cut 14 for a welded corner joint, so that the end surface 16 of a reinforcement insert 3 will be 1-2 mm from the welded joint. The distance D1 may be larger or lower, in particularly lower in case the profile 4 is intended to be assembled into a window frame by glued joints.

[0052] A second extruded profile 4 is shown in Figs. 4 and 4a, where the embedded reinforcement inserts 3 are indicated with dashed lines. The cutting zone 13 to the right provides room for two straight separating cuts 14 forming a V-shaped notch as shown in Fig. 3. The cutting zone 13 on the left is perpendicular to the longitudinal extent of the manufactured profile and is parallel to the transversal direction 15 of the profile 4.

[0053] In Fig. 4b is shown a detail of Fig. 4b, where the distance D1 between the end surface 16 of a reinforcement insert 3 to the separating cut 14 is indicated.

[0054] A third extruded profile 4 is shown in Figs. 5 and 5a, which closely resembles the profile 4 shown in Figs. 3, 3a and 3b, except that some reinforcement inserts 103 passes through the cutting zones 13. The reinforcement inserts 103 passing through the cutting zones 13 are not made from steel, preferably not made from metal, but are instead reinforcement inserts comprising a wire including a bundle of non-metal fibres, such as carbon fibres, Kevlar fibres, glass fibres, polyester fibres or natural fibres jointed together by e.g. a thermosetting resin to form an reinforcement insert, since such reinforcement inserts 103 can be cut with a cutting instrument, such as a circular saw, without causing heating damage to the material embedding the reinforcement insert 103.

[0055] A fourth extruded profile 4 is shown in a top view in Figs. 6, 6a and 6b, and the profile 4 resembles the third profile 4 shown in Figs. 5 and 5a, except that it furthermore includes local reinforcement inserts 203, which only extend a smaller distance as compared to the longest longitudinal extend of the bar Lmax, in particular less than 50% of the longest longitudinal extend of the bar Lmax. The local reinforcement inserts 203 reinforces the profile 4 at local placed to provide for local support for fittings of the window frame made from the manufactured profile 4, such as hinges, handles and locks. The distance D2 between the end surface 16 of the local reinforcement insert 203 and the cutting zone 13 is indicated on Fig. 6a.

[0056] Fig. 7 shows a side bar 17 and a top bar 19 for a frame with end surfaces 18, 20 extending at opposing 45°, which are suited for being jointed in a mitre joint. The two bars 17, 19 are made from identical profiles 4 with the same number of reinforcement inserts 3 at the same positions in reinforcement structures of the profile 4. In other embodiments, the top bar 19 have fewer reinforcement inserts 3 that the side bar 17, leaving some reinforcement structures empty.

[0057] Fig. 8 shows a corner joint between a top bar 19 and a side bar 17, wherein a thin layer of a suitable glue 21 is applied between the end surfaces 18, 20 of the bars 17, 19. The glue 21 may be e.g. a hot melt glue or an epoxy resin glue, such as a two-component glue. The distance D3 indicated in the detail of Fig. 8a from the end surface 16 of a reinforcement insert 3 to the glued corner joint 21 is in this case equal to the distance D1 between the end surface 16 of a reinforcement insert 3 and the separating cut 14.

[0058] A first welded corner joint 22, preferably by heat welding, between a top bar 19 and a side bar 17 is shown in Figs. 9, 9a and 9b, where the joint 22 consists of melted material of the top bar 19 and the side bar 17, which is manufactured by pressing the end surfaces 18, 20 of the top bar 19 and the side bar 17 towards a heated surface to soften a layer of material on both end surfaces 18, 20 sufficiently to provide for a heat welding of the two end surface 18, 20 when subsequently being pressed towards each other. The distance D3 indicated in the detail of Fig. 9b between the end surface 16 of a reinforcement insert 3 and the heat welded corner joint 22 is in this case less that the distance D1 between the end surface 16 of a reinforcement insert 3 and the separating cut 14 made when forming the bar 17, 19 because material of the bar 17, 19 has been used to form the heat welded joint 22.

[0059] A second welded corner joint 22 is shown in Figs. 10, 10a and 10b, where the reinforcement inserts 3 of the side bar 17 and the top bar 19 at corresponding reinforcement structures of the two bars 17, 19 are designed to collide during the welding process, here the colliding end surfaces 16 of the reinforcement inserts are shown with 45° matching surfaces, but they may have any other suitable shape. Thus, the distance D1 of the bars 17, 19 prior to the step of welding of the corner joint 22 is equal to the thickness of material which is softened to form the welded corner joint 22.

[0060] Fig. 11 is a detail of a longitudinal section of an extruded profile 4, where a local reinforcement insert 203 is embedded in a reinforcement enclosure 23 connected by a distancing part 24 of the reinforcement structure 25 to an external wall 26 of the profile 4.

[0061] Fig. 12 is a detail of a longitudinal section of an extruded profile 4, where a mutual longitudinal distance 6 between consecutive reinforcement inserts 3 form part of a cutting zone 13 of the profile 4 in which a straight separating cut 14 can be placed. The reinforcement inserts 3 are embedded in a reinforcement structure 25 comprising a reinforcement structure 23 connected by its distancing part 24 to an external wall 26 of the profile 4, similarly to the reinforcement structure 25 shown in Fig. 11.

[0062] Fig. 13 is a cross-section detail of A-A in Figs. 11 and 12, both sections going through a partly collapsed reinforcement enclosure 23 of the reinforcement structure 25, which comprises a reinforcement enclosure 23 for enclosing the reinforcement insert 3 and a distancing part 24 connecting to the external wall 26. The outer surface 27 of the reinforcement enclosure 23 is partly collapsed at the position of the section A-A, which is clearly shown in Fig. 13, whereas the outer surface 27 at a distance from the A-A section is not collapsed because a reinforcement insert 3 is present, for which reason the cross-section of Fig. 13 shows the outer surface 27 in a non-collapsed as well as in a partly collapsed state. The distancing part 24 is provided to increase the distance between the reinforcement insert 3 and the external wall 26 so that the partly collapse of the reinforcement enclosure 23 caused by the absence of an reinforcement insert 3, such as at the two A-A sections of Figs. 11 and 12, will not affect the aesthetical appearance of the exterior surface 28 of the external wall 26, which will be visible when the window frame is assembled.

[0063] Different sections of a frame corner between a side bar 17 and a top bar 19 with a welded joint 22 are shown in Figs. 14 to 17,

[0064] Fig. 14 is a cross-sectional view at D-D of Figs. 15, 16 and 17 showing a cross-section of a reinforcement structure 25 with a reinforcement enclosure 23 and a distancing part 24 connecting the reinforcement structure 25 with the outer wall 26 of the profile 4, and Figs. 15, 16 and 17 are longitudinal sectional views at A-A , B-B and C-C, respectively, of Fig. 14 from the top of a welded corner joint 22 of a frame.

[0065] In Fig. 14, the surfaces 27 of both the outer wall 27 of the reinforcement enclosure 23, the outer wall of the distancing part 24 and the inner surface 33 of the external wall 26 of the profile 4 are shown in smooth lines as well as uneven lines, representing the shape of the surfaces at the position of the section D-D as well as the surfaces at the contact with the welded joint 22.

[0066] A reinforcement insert 3 is embedded in the reinforcement enclosure 23 of the side bar 17 as well as the top bar 19, and it is it is apparent from the Fig. 15 that the reinforcement inserts 3 end before the welded joint 22. The distance D3 between the end surface 16 of the reinforcement insert 3 and the welded joint 22, which is shown in Fig. 9b, has not been indicated in Figs. 15, 16 and 17. The end surface 16 of the reinforcement inserts 3 is shown as being perpendicular to the longitudinal direction of the of the reinforcement inserts 3. Alternatively, the end surface 16 of the reinforcement insert 3 may be rounded or have an angle, such as 45° with the longitudinal direction.

[0067] In Fig. 15, the reinforcement structure 25 is seen in a section A-A from above the reinforcement enclosure 23, and the hidden reinforcement insert 3 is indicated with a broken line. In Fig. 16, the section B-B through the reinforcement enclosure 23 as well as the reinforcement insert 3 is shown.

[0068] Section C-C through the distancing part 24 is shown in Fig. 17 as viewed towards the reinforcement enclosure 23, the outer surface 27 of which is visible in the figure. The reinforcement insert 3 is hidden and is indicated with a broken line.

[0069] Fig. 18 is a longitudinal sectional view similar to the view in Fig. 15 at A-A of Fig. 14 from the top but with a of a glued corner joint 21 instead of a welded joint 22.

[0070] Three cross-sections of different embodiments of a reinforcement structure 25 with a reinforcement enclosure 23 and a distancing part 24 connected to an external wall 26 of a profile 4 are shown in Figs. 19, 20 and 21, which deviates from the embodiment shown in Figs. 13 and 14.

[0071] In the embodiment shown in Fig. 19, the distancing part 24 of the reinforcement structure 25 has the same width as the reinforcement enclosure 23, which provides for a stronger and more stiff connection between the reinforcement insert 3 and the external wall 26 of the profile 4, for which reason a larger force can be transferred between the two without risking damages to the structures of the reinforcement enclosure 23 or the distancing part 24. In the embodiment shown in Fig. 20, an opening 29 has been provided in the distancing part 24 of the reinforcement structure 25, providing most of the benefits of the wide distancing part 24 shown in Fig. 19 but with the use of less thermoplastic materials.

[0072] The reinforcement enclosure 23 of the reinforcement structure 25 shown in cross-section in Fig. 21 comprises a longitudinal slit 30 in the reinforcement enclosure 23 going from the external surface 27 of the reinforcement enclosure to the reinforcement insert 3, whereby the reinforcement insert 3 is only partly embedded in the thermoplastic material of the reinforcement enclosure 23. Hereby, the use of thermoplastic material is reduced as compared to the fully embedding reinforcement enclosure of e.g. Figs. 13 and 14.

[0073] A cross-section of a bar 17, 19 for a sash frame 34 is shown in Fig. 22 with a glazing unit 31 mounted to the bar 17, 19 on a glazing gasket 32. The profile 4 of the bar 17, 19 is reinforced with reinforcement inserts 3 arranged in reinforcement structures 25 embedding the reinforcement inserts 3 completely in the thermoplastic material of the profile 4, wherein the reinforcement structures 25 are placed on an inner surface 33 of the external wall 26 of the profile 4. The reinforcement inserts 3 are in this embodiment solid cylindrical rods with a diameter Di of 4 mm. The diameter Di is generally preferred to be in the range of 1 to 6 mm. The reinforcement structures 25 are formed so that the minimum distance Dm between the reinforcement inserts 3 and the exterior surface 28 of the external wall 26 of the profile 4 is substantially equal to the width Ww of the external wall 26 at the position of the reinforcement structure 25.

[0074] The sash frame 34 of Fig. 22 is shown in cross-section together with the corresponding fixation frame 35 in Fig. 23. The fixation frame 35 is reinforced with reinforcement inserts 3 placed in reinforcement structures 25 which fully embed the reinforcement inserts 3 in the thermoplastic material. The fixation frame 35 is made from an extruded profile 4 manufactured by a process similar to the profile 4 of the bars 17, 19 of the sash frame 34. The sash frame 34 and the fixation frame 35 constitutes parts of a roof window and are connected to each other by means of a central pivot hinge 36 comprising a sash hinge part 37 mounted on the sash frame 34 and a fixation hinge part 38 mounted on the fixation frame 35. A set of gaskets 39 are provided between the sash frame 34 and the fixation frame 35 to seal the slit between the two when the sash frame 34 is in a closed position.

[0075] A cross-section of a sash frame 34 is shown in Fig. 24, which is similar to the one shown in Figs. 22 and 23, except that some of the reinforcement structures 25 are formed with a reinforcement enclosure 23 embedding the reinforcement insert 3 and one or two distancing parts 24 connecting the reinforcement enclosure 23 with one or two external walls 26. The width Wd of the distancing part 24 of the reinforcement structures 25 are formed so that the minimum distance Dm between the reinforcement inserts 3 and the exterior surface 28 of the external wall 26 of the profile 4 is substantially equal to 2 times the width Ww of the external wall 26 at the position of the reinforcement structure 25 in order to prevent the partly collapse of the reinforcement enclosure 23 caused by the absence of an reinforcement insert 3 from affecting the aesthetical appearance of the exterior surface 28 of the external wall 26.

[0076] Fig. 25 shows a cross-section of the sash frame 34 of Fig. 24 with a corresponding fixation frame 35, of which some of the reinforcement structures 25 are formed with a reinforcement enclosure 23 embedding the reinforcement insert 3 and distancing parts 24 connecting the reinforcement enclosure 23 with external walls 26 of the profile 4.. The sash frame 34 and the fixation frame 35 constitutes parts of a roof window and are connected to each other by means of a central pivot hinge 36 comprising a sash hinge part 37 mounted on the sash frame 34 and a fixation hinge part 38 mounted on the fixation frame 35.

[0077] Fig. 26 shows a cross-section of a sash frame 34 with a glazing unit 31 and with a corresponding fixation frame 35, wherein some of the reinforcement structures 25 are provided with a reinforcement enclosure 23 and a distancing part 24, similarly to what is shown in Fig 25. Furthermore, the sash frame 34 as well as the fixation frame part 35 are provided with local reinforcement inserts 203 for supporting the sash hinge part 37 and the fixation hinge part 38, respectively. These local reinforcement inserts 203 strengthens the side bar 17 of the sash frame 34 as well as the fixation frame 35 at the point where the hinge 36 is attached. The longitudinal extend of the local reinforcement inserts 203 is about 25 cm.

[0078] Fig. 27 shows a cross-section of a sash frame 34 with a glazing unit 31 and with a corresponding fixation frame 35, wherein some of the reinforcement structures 25 are provided with a reinforcement enclosure 23 and a distancing part 24, similarly to what is shown in Fig 26. The sash frame 34 as well as the fixation frame part 35 are provided with local reinforcement inserts 203 for supporting the sash hinge part 37 and the fixation hinge part 38, respectively. However, this hinge 36 deviates from the hinge 36 shown in Fig. 26 in that a tongue-and-groove hinge 36 is provided, where the sash hinge part 37 and the fixation hinge part 38 each is provided with a tongue 40 to engage with a corresponding groove in the sash frame 34 and the fixation frame 35.

[0079] Fig. 28 shows a cross-section of another sash frame 34 with a glazing unit 31 and having reinforcement structures 25 for reinforcement inserts 3 and with a corresponding fixation frame 35.

[0080] Fig. 29 shows a cross-section of a sash frame 34 with a glazing unit 31 and a fixation frame 35, similar to the one shown in Fig. 28, wherein some of the reinforcement structures 25 comprises a reinforcement enclosure 23 and a distancing part 24.

[0081] Fig. 30 is a front view of a window frame 34, 35, where the side bars 17, the top bar 19 as well as the bottom bar 41 have 45° separating cuts at both ends, for which reason all four corner joints are mitre joints. A different window frame 34, 35 is shown in Fig. 31, where the side bars 17 have a 45° separating cut at the upper end and a straight cut at the lower end, matching corresponding straight cuts of the ends of the bottom bar 41.

[0082] Fig. 32 is a perspective view of a roof window 42 according to embodiments of the present disclosure. The roof window 42 may also be known as a skylight. The roof window 42 comprises a frame arrangement with a fixation frame 35 and a movable sash frame 34. The sash frame 34 provides a support of an insulating glass unit 31. The fixation frame 35 is configured to be arranged to cover (together with the sash frame 34) a building aperture 43 in the roof structure 44, and the fixation frame 35 is configured to be attached / fixated to a roof structure 44 of a building 45.

[0083] Fig. 33 is a cross-section of a reinforced profile for a bottom bar 41 for a frame 34, 35 of a roof window 42, such as a movable sash frame 34 of a roof window 42 or a fixation frame 35. The glass unit 31 will overlap the upper side of the bottom bar 41 as it is shown on the figure, and the glass unit 31 has been omitted from the figure to improve figure simplicity. Reinforcement inserts 3 are situated in reinforcement structures 25 embedding the reinforcement inserts 3 completely in the thermoplastic material of the profile 4, wherein the reinforcement structures 25 are placed on an inner surface 33 of the external wall 26 of the profile 4.

[0084] Fig. 34 is an illustration of a building 45 in which two roof windows 42 are installed in a roof structure 44 to cover building apertures 43 in the roof structure 44.References

[0085] 1Extruder 2Extrusion die 3Reinforcement insert 103Reinforcement inserts passing cutting zones 203Local reinforcement inserts 4Extruded profile 5Insert feeder 5aGuide 6Longitudinal distance between consecutive reinforcement inserts 7Screw feeder 8Material hopper 9Production line 10Cooling unit 11Haul-off unit 12Haul-off belts 13Cutting zone 14Straight separating cuts 15Transversal direction of profile 16End surface of reinforcement insert 17Side bar of frame 18End surface of side bar 19Top bar of frame 20End surface of top bar 21Glue joint 22Welded joint 23Reinforcement enclosure 24Distancing part 25Reinforcement structure 26External wall of profile 27Outer surface of reinforcement enclosure 28Exterior surface of external wall 29Opening in distancing part of reinforcement structure 30Longitudinal slit in reinforcement enclosure 31Glazing unit 32Glazing gasket 33Inner surface of external wall 34Sash frame 35Fixation frame 36Central pivot hinge 37Sash hinge part 38Fixation hinge part 39Set of gaskets between sash frame and fixation frame 40Tongue 41Bottom bar of frame 42Roof window 43Building aperture 44Roof structure 45Building D1Distance from end surface of reinforcement insert to separating cut D2Distance between end surface of local reinforcement insert and cutting zone D3Distance from the end surface of reinforcement insert to glued or welded corner joint DiDiameter of reinforcement insert DmMinimum distance between reinforcement insert and exterior surface of external wall. Int.Interior side of roof window Ext.Exterior side of roof window LmaxLongest longitudinal extend of bar WwWidth of external wall WdWidth of distancing part Items

[0086] 1. A window frame part, such as for a roof window (42), comprising at least a top bar (19) and a side bar (17), wherein the top bar (19) is manufactured by extrusion of a profile (4) of one or more thermoplastic materials and the side bar (17) is manufactured by extrusion of a profile (4) of one or more thermoplastic materials, wherein one or more reinforcement inserts (3) have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profile (4) of the side bar (17) comprises one or more discretely arranged extruded elongated reinforcement structures (25), which each comprises a reinforcement enclosure (23) connected to an interior side (33) of an external wall (26) of the side bar (17), the external wall (26) having an interior side (33) and an exterior side (28), wherein the reinforcement enclosures (23) of the side bar (17) each partly or fully encloses a reinforcement insert (3), wherein a corner joint (21, 22) is provided between an end of the top bar (19) and a top end of the side bar (17) to form an L-shaped frame part. 2. A frame (34, 35), such as for a window (42), comprising a frame part according to item 1, further comprising a second side bar (17), wherein the second side bar (17) is manufactured by extrusion of a profile (4) of one or more thermoplastic materials, wherein one or more reinforcement inserts (3) have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profiles (4) of the two side bars (17) comprise one or more discretely arranged extruded elongated reinforcement structures (25), which each comprises a reinforcement enclosure (23) connected to an interior side (33) of an external wall (26) having an interior side (33) and an exterior side (28), wherein the reinforcement enclosures (23) of the side bars (17) each partly or fully encloses a reinforcement insert (3), wherein a corner joint (21, 22) is provided between each end of the top bar (19) and one of the top ends of the two side bars (17) to form a U-shaped frame part. 3. The frame (34, 35) according to item 2, wherein the frame is a fixation frame (35). 4. The frame (34, 35) according to item 2, wherein the frame is a sash frame (34). 5. The frame (34, 35) according to any of items 2 to 4, wherein one side bar (17) is less reinforced by reinforcement inserts (3) than the other side bar (17). 6. The frame (34, 35) according to item 5, wherein the less reinforced side bar (17) comprises fewer reinforcement inserts (3) that the other side bar (17). 7. The frame (34, 35) of frame part according to any of the preceding items, wherein the top bar (19) and the one or two side bars (17) have been extruded through substantially identical extrusion dies (2). 8. The frame (34, 35) or frame part according to any of the preceding items, wherein the reinforcement inserts (3) in the bars (17, 19) extend to a distance of at least 0.5 mm from a corner joint (21, 22), such as at least 1 mm from a corner joint (21, 22). 9. The frame (34, 35) according to any of the preceding items, wherein end surfaces (16) of the reinforcement inserts (3) in the bars (17, 19) are embedded in the thermoplastic material of the corresponding reinforcement enclosure (23). 10. The frame (34, 35) or frame part according to any of items 1 to 7, wherein reinforcement inserts (3) are present at corresponding reinforcement enclosures (23) in at least one side bar (17) and in the top bar (19), and wherein the ends (16) of such reinforcements inserts (3) abut in the corner joint (21, 22). 11. The frame (34, 35) or frame part according to any of the preceding items, wherein at least some of the reinforcement structures (25) comprise a distal reinforcement enclosure (23) and a proximate distancing part (24) connecting the reinforcement enclosure (23) with the interior side (33) of the external wall (26), wherein the smallest distance (Dm) in any cross-sectional direction of the profile (4) between the reinforcement insert (3) in one or more of the reinforcement structures (25) and the exterior side (28) of the external wall (26) to which it is connected is at least 1.3 times the width (Ww) of that external wall (26), such as at least 1.5 times, such as at least 2 times the width (Ww) of that external wall (26). 12. The frame (34, 35) or frame part according to item 11, wherein the width (Wd) of the distancing part (24) in the cross-sectional direction of the profile (4) is at least 70% of the width (Ww) of the external wall (26) to which it is connected, such at least 100%, such as within 70 to 130 % of the width (Ww) of the external wall (26) to which it is connected, preferably within 85 to 120 %. 13. The frame (34, 35) or frame part according to any of the preceding items, wherein the corner joints (21, 22) are provided as chemical joints (21, 22). 14. The frame (34, 35) or frame part according to item 13, wherein the corner joints (21, 22) are provided as welded joints (22), preferably heat welded. 15. The frame (34, 35) or frame part according to item 13, wherein the corner joints (21, 22) are provided as glued joints (21). 16. The frame (34, 35) or frame part according to item 13, wherein the corner joints are provided as corner key joints, wherein each bar (17, 19) of a joint is fastened to a common corner key. 17. The frame (34, 35) or frame part according to item 16, wherein reinforcement inserts (3) of the side bar (17) and / or the top bar (19) abut one or more abutment surfaces of the corner key. 18. The frame (34, 35) or frame part according to of any of the preceding items, wherein one or more reinforcement inserts (3) have been partly or fully embedded in the thermoplastic material of the top bar (19) during the extrusion process. 19. The frame (34, 35) or frame part according to item 18, wherein the cross-sectional position of at least one of the reinforcement inserts (3) of the top bar (19), preferably at least two reinforcement inserts (3), corresponds to the cross-sectional position of reinforcement inserts (3) of the side bar (17) or bars (17). 20. The frame (34, 35) or frame part according to item 19, wherein each corner joint (21, 22) between the top bar (19) and one of the side bars (17) includes a rigid connection between at least a part of the reinforcement structures (25) of the top bar (19) that encloses a reinforcement insert (3) and the corresponding reinforcement structures (25) of the side bar (17). 21. The frame (34, 35) or frame part according to any of the preceding items, wherein one or more of the reinforcement inserts (3, 203) in a side bar (17) are local reinforcement inserts (203), the longitudinal extend of the local reinforcement inserts (203) being less than 50% of the longest longitudinal extend (Lmax) of the side bar (17). 22. The frame (34, 35) or frame part according to any of the preceding items, wherein at least one of the reinforcement inserts (3) of the bars (17, 19) extends to less than 5 mm from the corner joint (21, 22) between the top bar (19) and one of the side bars (17), such as less than 3 mm, preferably less than 2 mm. 23. The frame (34, 35) or frame part according to any of the preceding items, wherein the top bar (19) is less reinforced by reinforcement inserts (3) than the one or two side bars (17). 24. The frame (34, 35) or frame part according to item 23, wherein the top bar (19) comprises fewer reinforcement inserts (3) that the side bar (17) or bars (17). 25. The frame (34, 35) or frame parts according to any of the preceding items, wherein at least some of the reinforcement inserts (3) are made from metal, such as steel. 26. The frame (34, 35) or frame parts according to any of the preceding claims, wherein the reinforcement inserts (3) are solid rods. 27. The frame (34, 35) or frame parts according to any of the preceding items, wherein one or more of the reinforcement enclosures (23) of the bars (17, 19) are of a non-uniform cross-sectional shape in the longitudinal direction of the bar (17, 19) due to reinforcement inserts (3) of a shorter length than the longitudinal extend of the bar (17, 19) at the position of the reinforcement enclosure (23). 28. The frame (34, 35) or frame parts according to any of the preceding items, wherein the side bar (17) or bars (17) has an upper end which is cut at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction (15) of the profile (4) and perpendicular to a longitudinal direction of the profile (4), and the top bar (19) being cut at both ends at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction (15) of the profile (4) and perpendicular to a longitudinal direction of the profile (4).

Examples

Embodiment Construction

[0045]An extruder 1 arranged for manufacturing the reinforced profile for window frames is shown in Fig. 1. The extruder 1 comprises an extrusion die 2, which includes a plurality of insert positions (now shown) allowing reinforcement inserts 3 to be fed into the extruded profile 4 during the extrusion process by an insert feeder 5 arranged at an inlet side of the extrusion die 2. A guide 5a is arranged between the insert feeder 5 and the extrusion die 2 to stabilise the position and direction of the reinforcement inserts 3.

[0046]The insert feeder 5 is controlled to feed the reinforcement inserts 3 to the specific insert positions intermittently so as to provide a predetermined longitudinal distance 6 between consecutive reinforcement inserts 3 in the manufactured profile 4. According to one embodiment, consecutive reinforcement inserts 3 for the specific insert position are fed end-to-end into the extrusion die 2 and the feeding of the subsequent of the reinforcement inserts 3 is t...

Claims

1. A window frame (34, 35), such as for a roof window (42), comprising at least a top bar (19) and two side bars (17), wherein the top bar (19) is manufactured by extrusion of a profile (4) of one or more thermoplastic materials and the two side bars (17) are manufactured by extrusion of a profile (4) of one or more thermoplastic materials, wherein one or more reinforcement inserts (3) have been embedded in the thermoplastic material during the extrusion process, wherein a cross-section of the extruded profile (4)s of the two side bars (17) comprise one or more discretely arranged extruded elongated reinforcement structures (25), which each comprises a reinforcement enclosure (23) connected to an interior side (33) of an external wall (26) of the side bar (17), the external wall (26) having an interior side (33) and an exterior side (28), wherein the reinforcement enclosures (23) of the side bars (17) each partly or fully encloses a reinforcement insert (3), wherein a corner joint (21, 22) is provided between each end of the top bar (19) and one of the top ends of the two side bars (17) to form a U-shaped frame part.

2. The frame (34, 35) according to claim 1, wherein the reinforcement inserts (3) in the bars (17, 19) extend to a distance (D3) of at least 0.5 mm from a corner joint (21, 22), such as at least 1 mm from a corner joint (21, 22).

3. The frame (34, 35) according to claim 1 or 2, wherein end surfaces (16) of the reinforcement inserts (3) in the bars (17, 19) are embedded in the thermoplastic material of the corresponding reinforcement enclosure (23).

4. The frame (34, 35) according to any of the preceding claims, wherein at least some of the reinforcement structures (25) comprise a distal reinforcement enclosure (23) and a proximate distancing part (24) connecting the reinforcement enclosure (23) with the interior side (33) of the external wall (26), wherein the smallest distance (Dm) in any cross-sectional direction of the profile (4) between the reinforcement insert (3) in one or more of the reinforcement structures (25) and the exterior side (28) of the external wall (26) to which it is connected is at least 1.3 times the width (Ww) of that external wall (26), such as at least 1.5 times, such as at least 2 times the width (Ww) of that external wall (26).

5. The frame (34, 35) according to claim 4, wherein the width (Wd) of the distancing part (24) in the cross-sectional direction of the profile (4) is at least 70% of the width (Ww) of the external wall (26) to which it is connected, such at least 100%, such as within 70 to 130 % of the width (Ww) of the external wall (26) to which it is connected, preferably within 85 to 120 %.

6. The frame (34, 35) according to any of the preceding claims, wherein the corner joints (21, 22) are provided as chemical joints (21, 22).

7. The frame (34, 35) according to claim 6, wherein the corner joints (22) are provided as welded joints (22), preferably heat welded joints (22).

8. The frame (34, 35) of any of the preceding claims, wherein one or more reinforcement inserts (3) have been partly or fully embedded in the thermoplastic material of the top bar (19) during the extrusion process.

9. The frame (34, 35) according to claim 8, wherein the cross-sectional position of at least one of the reinforcement inserts (3) of the top bar (19), preferably at least two reinforcement inserts (3), corresponds to the cross-sectional position of reinforcement inserts (3) of the side bar (17).

10. The frame (34, 35) according to claim 9, wherein each corner joint (21, 22) between the top bar (19) and one of the side bars (17) includes a rigid connection between at least a part of the reinforcement structures (25) of the top bar (19) that encloses a reinforcement insert (3) and the corresponding reinforcement structures (25) of the side bar (17).

11. The frame (34, 35) according to any of the preceding claims, wherein one or more of the reinforcement inserts (3, 203) in each of the two side bars (17) are local reinforcement inserts (203), the longitudinal extend of the local reinforcement inserts (203) being less than 50% of the longest longitudinal extend (Lmax) of the side bars (17).

12. The frame (34, 35) according to any of the preceding claims, wherein at least one of the reinforcement inserts (3) of the bars (17, 19) extends to less than 5 mm from the corner joint (21, 22) between the top bar (19) and one of the side bars (17), such as less than 3 mm, preferably less than 2 mm.

13. The frame (34, 35) according to any of the preceding claims, wherein the top bar (19) is less reinforced by reinforcement inserts (3) than the two side bars (17).

14. The frame (34, 35) according to any of the preceding claims, wherein at least some of the reinforcement inserts (3) are made from metal, such as steel.

15. The frame (34, 35) according to any of the preceding claims, wherein the reinforcement inserts (3) are solid rods.

16. The frame (34, 35) according to any of the preceding claims, wherein one or more of the reinforcement enclosures (23) of the bars (17, 19) are of a non-uniform cross-sectional shape in the longitudinal direction of the bar (17, 19) due to reinforcement inserts (3) of a shorter length than the longitudinal extend of the bar (17, 19) at the position of the reinforcement enclosure (23).

17. The frame (34, 35) according to any of the preceding claims, wherein the two side bars (17) each has an upper end which is cut at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction (15) of the profile (4) and perpendicular to a longitudinal direction of the profile (4), and the top bar (19) being cut at both ends at an angle in the range of 30 to 60°, preferably 45°, to the transversal direction (15) of the profile (4) and perpendicular to a longitudinal direction of the profile (4).

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