DK201400641A1 - Prefabricated window frame - Google Patents

Abstract

A prefabricated window frame (2) of the type composed of a plurality of panel sections (10, 12, 14, 16) suitable for fitting and placing about a current opening (6) in a wall (8) is indicated, which panel sections ( 10, 12, 14, 16) are assembled by associated cooperating sections (18), wherein the panel sections (10, 12, 14, 16) are formed by a plurality of elongate profile bodies (24) comprising a plurality of parallel extending cavities (28, 30, 32). 34, 36) with open ends, and wherein the connector sections (18) comprise protruding locking lugs (60) cooperating with first cut grooves (29) in the elongate profile bodies (24), and which assembly sections (18) further comprise a first stop surface ( 54) and another stop surface (54) cooperating with the first ends (11) and other ends (13) of the elongate profile bodies, against which stop faces (54), relevant ends (11, 13) of the profile bodies (24) are in full installation, in the overall window frame (2). The prefabricated window frame is distinguished by its ease of construction and can therefore be mounted by a man, and it has excellent insulating properties due to the stagnant air in the parallel running cavities. The stated window frame is very suitable for use in new buildings and exterior insulation work on existing buildings.

Description

BACKGROUND OF THE INVENTION The present invention relates to a prefabricated window frame of the type composed of a plurality of panel sections suitable for fitting and positioning around a current aperture in a wall, which panel sections are assembled by cooperating assembly sections, thus forming the panel sections and assembly sections together. the frame for a window suitable for the current opening, and which frame comprises means for anchoring it to the wall and to the sides of the opening.

Such window frames are used, for example, for new buildings, where the interior walls are erected and where the window openings must be provided with window frames, before windows are installed. The frames can also be used for post-insulation of existing buildings, where exterior insulation is exterior and where new exterior cladding is subsequently installed.

The traditional window frames are typically made of wood, where each side of the window frame is formed in-situ, after which the individual parts of the frame are provided with angular brackets, after which the frame is fixed to the wall around the window opening with nails or screws.

From DK 2008 00438 L is known a prefabricated window frame, which is composed of two vertical side panel plates and an upper panel plate and a lower panel plate the individual parts of which are formed with corner joints of extruded metal or plastic edge profiles, where one edge profile is attached to the end surface of the the adjacent side panel plate and the other edge profile are attached to the corresponding end surface of the overlying panel plate, whereby one edge profile is provided with a groove and the other edge profile has a protruding profile rib which corresponds to this groove which is adapted to insert into the groove. lock the two edge profiles together, for example with clamping action or by a known snap lock effect.

The foregoing prior art has the weakness that it is not immediately possible to adjust the length of the side panels, since the adjustment will require the establishment of a new prominent edge profile rib for insertion into the corner joint groove, which requires access to precision milling equipment.

In addition, the above solution is not air and steam tight, which is often the requirements for construction and renovation of buildings, due to greater requirements for insulation. Furthermore, the known solutions will necessitate the involvement of several persons for assembly, due to the weight of the overall frame.

The object of the invention is to provide window frames which can be prefabricated and which are also easily adaptable, assembled and mounted by a person, and which are also stable and offer good insulating properties.

This object is achieved by a prefabricated window frame of the kind composed of a plurality of panel sections suitable for fitting and positioning around a current opening in a wall, which panel sections are assembled by co-operating assembly sections so that the panel sections and assembly sections jointly form the frame for a for the current opening, a suitable window, and the frame comprising means for anchoring it to the wall and to the sides of the opening, characterized in that the panel sections of a current window frame are constituted by a plurality of elongated bodies of the same width, with a first and a a second end, a first long side and a second long side, and a first outer surface and a second inner outer surface, which elongate profile bodies comprise a number of open-ended parallel-extending cavities, a number of which are divided into a cavity and first cut grooves respectively. , whose openings appear as slots in the first outer surface, and which assembly sections comprise protruding locking lugs cooperating with the first cut grooves in the elongate bodies, and which assembly sections further comprise a first stop surface and a second stop surface cooperating with the first and second ends of the elongate profile bodies, against which stop surfaces, relevant ends of the profile bodies are in full plant, in the total window frame.

This provides a window mounting that can be produced on a scale, to a current window opening in a wall, which can also be adjusted in length with simple tools, such as a saw. Furthermore, the combination of the panel sections and the stop sections of the sectional sections thereby contributes to the window insulation being extremely insulating, as the parallel extending cavities in the panel sections are blocked by the stop surfaces, thereby closing the cavity of the panel sections so that the air therein is stationary, which provides optimum insulation properties. architrave.

In order to ensure good retention between the junction sections and the panel sections, the lock sections of the junction sections at the end closest to the panel section may have a wedge-shaped design whose largest outer circumference and geometry at least correspond to the geometry of the first cut grooves. This causes the locking knobs to be squeezed upon insertion into the first cut grooves, thereby increasing the friction between the outer sides of the locking knobs and the corresponding sides of the first cut grooves, which causes the joint between the joint sections and the panel sections to become stable. Furthermore, the wedge-shaped design of the locking lugs has the advantage that it is easier to insert the locking lugs in the first cut grooves in the panel sections.

In order to be able to apply the window frame according to the invention to traditional rectangular basic window openings, the assembly sections may be made up of actual corner profiles consisting of an angle piece having a substantially W-shaped cross section, the first sides of which apply to the center of the W-shaped cross section. sides, the protruding locking knobs comprise and whose parallel extending, contiguous other sides comprise the stop surfaces whose surfaces are mutually orthogonally oriented.

In order to make the window frame stable, the other outward facing sides of the W-shaped corner profiles may include spaced stiffening ribs. This results in the window frame being stable in relation to transverse force effects.

In order to make the window frame according to the invention more stable, the wall-facing side of the W-shaped corner profiles may comprise an outwardly sloping finish which terminates with an abutment flange parallel to the stiffening ribs bounded by the parallel extending sides. on the side facing the center of the W-shaped cross-section, and extending slightly beyond the outward-facing sides of the W-shaped corner profile. This results in increased stability of the corner profiles, and thus of the entire window frame.

In order to be able to easily attach the window frame according to the invention to a wall surface around a current window opening, the stop flange may comprise openings for receiving fasteners intended for recovery in the wall around the opening in the wall.

In order to obtain a good retention of the window frame according to the invention, it may further comprise a plurality of support legs for placement and arrangement in one of the cut grooves in the first outer surface, each support leg comprising a first base course which extends into a length of course forming a first angle of the first base course which changes into a second base course which forms a second angle of the course length and wherein the sum of the first angle and the second angle is 90 degrees, said first base course comprising a locking member cooperating with the cut grooves, for insertion in a current slot-shaped opening in a current slot-shaped groove perpendicular to the first outer surface, and locking in the same current slot, by a 90 degree rotation of the support leg.

This provides a quick and easy mounting of stiffening ribs, typically mounted along the outside of the window frame, preferably on the downward side of the window frame, to support it. This furthermore means that a window frame according to the invention can be delivered as a "flatpack", which makes it considerably easier and cheaper to transport from the production site to the installation site.

In order to facilitate the attachment of the window frame according to the invention to the wall opening around the window opening, the second basic course may comprise openings for receiving fasteners intended for recovery in the wall around the opening in the wall.

This facilitates the attachment of the window frame considerably, since fasteners that are retrievable in the wall do not have to be drilled through the basic course.

In order to be able to control and maintain the window frame according to the invention in the window opening, the panel sections may further comprise at least one other cut groove, the opening of which appears as slots in the second inner outer surface of the window frame, and further comprise a number of clips for placement and arresting in the window opening. the second cut groove in the second inner outer surface, which is constituted by an oblong, plate-shaped workpiece with a first flat side and a second flat side, with a first flat side end and a second flat side end, as well as a first long side surface and a second long side surface, wherein the first flat side near the first flat side comprises a cooperating locking groove with the second undercut groove for insertion into the second undercut groove in a position where the longitudinal surfaces of the plate-shaped blank are oriented parallel to the second cut groove and a locked position wherein said long side surfaces are oriented across it other undercut tracks.

Hereby it is achieved that a desired number of clips can be quickly and easily mounted for holding and controlling the window frame according to the invention in the opening in the wall, for which the window luminaire according to the invention is mounted, the clips in the properly mounted state projecting backwards outside the window frame and into in the opening in the wall, and touch the wall.

It is preferred that the elongate plate-shaped blanks adjacent the second flat side end include apertures for receiving fasteners intended for recess in the wall around the aperture in the wall.

This provides an easier and faster attachment of the window frame to the opening in the wall, and again that a whole window frame can be packed as a "flatpack", which makes transport and storage easier and more space-saving than with the known window frames.

It is preferred that the parts included in the window frame according to the invention, which are made up of the panel sections, the assembly sections, the support legs and the clips, are made of extruded and molded plastic parts.

The advantage of this is that a whole window frame in a total package is relatively lightweight and can be worn by a single person, while still the window frame assembled by the individual parts is as stable as the commonly known window frames, thanks to the cell / channel structure of the panels. , and the reinforcement ribs and impact flange of the assembly sections.

The invention is explained in more detail below with reference to the drawing, wherein; FIG. 1 is an exploded perspective view of a first embodiment of a window mount for mounting on a wall, according to the invention; 2 is a front view of the one shown in FIG. 1 in a assembled condition with an inserted window mounted on a wall surface; FIG. 3 is a side view of the device of FIG. 2; FIG. 4 is a side sectional view of the embodiment of FIG. 3; FIG. 5 is a sectional view of an embodiment of a panel section belonging to the window frame; FIG. 6 is a perspective view of one embodiment of a window section assembly section; FIG. 7 is an end elevational view of the embodiment of FIG. 6; FIG. 8 is an internal side view of the embodiment of FIG. 6 and 7, showing the stop surfaces for abutments with cooperating panel sections,

FIG. 9 is an end elevational view of the embodiment of FIG. 6 of the end opposite to that of FIG. 7; FIG. 10 is an exterior side view of the embodiment of FIG. 6 or FIG. 7, showing the stiffening ribs of the assembly section; FIG. 10, 11, 12, 13, 14 and 15 are a sectional view of the one shown in FIG. 5 shows a panel section shown during insertion of a support leg for the window frame according to the invention; and FIG. 16 is a front view of the one shown in FIG. 1 shows a window mount ready for mounting around an opening in a wall; FIG. 17 is a side view of the embodiment of FIG. 16, FIG. 18 is a side sectional view taken along line B-B of those in FIG. 16, showing how clips are inserted, and FIG. 19 is a perspective view of a window frame according to the invention, with mounted clips in the cut groove in the second inner outer surface of the panel sections.

In FIG. 1 shows an embodiment of a window frame 2 according to the invention, in perspective exploded view, seen obliquely from the front 4. The window frame 2 in the illustrated embodiment has in its overall state a rectangular shape suitable for mounting about an opening 6 for a window, in a wall 8, (see Fig. 2).

In the illustrated embodiment of the window frame 2 according to the invention, it comprises a lower, horizontally oriented rectangular panel section 10, an upper horizontally oriented rectangular panel section 12, the panels sections 10, 12 being equal in length, a first vertically oriented rectangular panel section 14, a second vertically oriented rectangular panel section 16, wherein the panel sections 14, 16 are equal in length, four like joint sections 18, two like support legs 20, and a plurality of like clips 22. Each panel section 10, 12, 14, 16 comprises a first end 11, a second end 13 , a first long side 15 and a second long side 17, as well as a first outer surface 19 and a second inner outer surface 21.

In FIG. 2 is the one shown in FIG. 1, in the assembled state, of the window frame 2 according to the invention, and mounted around an opening 6 in a wall 8, with a window 7 inserted therein.

In FIG. 3 is a side view of the one shown in FIG. 2 shows the window frame 2 according to the invention. Here we see how the support legs 20 are in contact with the outer surface of the wall and how the clips 22 project through the opening 6 in the wall of the window frame 2 according to the invention.

In FIG. 4 is a side sectional view along line A-A of FIG. 3, the location of two of the clips 22 is seen in the opening 6 in the wall 8 of the window frame 2, according to the invention.

In FIG. 5, a cross-sectional view shows the adapted elongated rectangular profile bodies 24 of which the panel sections 10, 12, 14, 16 are formed. As shown in FIG. 5, the profile bodies 24 have a cell structure 26 which causes them to have a number of parallel extending cavities 28, 29 which, with a few exceptions 30, 32, 34, 36, have a rectangular cross section. The cell structure 26 results in the profile bodies 24 at once achieving satisfactory static stability, while at the same time keeping the weight of the profile bodies 24 at a minimum. Furthermore, the cell structure 26 causes the panel sections to have excellent insulating properties in combination with the assembly sections 18, as will be described later. As shown in FIG. 3, 4 and 5, the profile bodies 24 gradually become thicker closest to the side 38 facing the wall 8, which is about the three cavities 30, 32, 34, which is justified by the desire for the profile bodies 24 to have a greater resistance moment over this course, with the torque load here being greatest, on the window frame 2 formed by the profile bodies 24. The parallel-extending cavities 28, 30, 32, 34 comprise a number of walls 40, 42, 44, whereby the cell structure 26 is formed.

A plurality of the cavities 28 are provided with a wall 46 divided into a cavity 28 and a first cut groove 29, the openings 48 of which appear as slots 50 in the first outer surface 19. The first cut grooves 29 serve several purposes, as described in Subsequently.

FIG. 6 is a perspective view of an embodiment of an assembly section 18, 52 for assembling panel sections 10, 12, 14, 16, belonging to the window frame 2 according to the invention. The embodiment shown in the assembly section 52 is intended for assemblies of panel sections 10, 12, 14, 16 for window frames 2 for commonly known rectangular window openings 6 in walls 8.

FIG. 7 is a side view of the one shown in FIG. 6, seen from the side facing the wall 8 of the assembly section 18, 52, FIG. 8 is an internal side view of the embodiment of FIG. 6 and 7, showing stop faces 54 for abutments with cooperating panel sections 10, 12, 14, 16; 9 is an end view of the embodiment of FIG. 6, seen from the freely extending end of the assembly section 18, 52, and FIG. 10 is an exterior side view of the embodiment of FIG. 6 or FIG. 7, showing stiffening ribs 56 on the outer side 58 of the assembly sections 52.

As shown in FIG. 6-9, the locking sections 60 of the assembly sections comprise a slightly wedge-shaped course 62 between the narrowest portion starting from the free end 64 of the locking lugs, and to the full width of the locking lugs, the largest outer circumference and geometry at least corresponding to the geometry. of the first cut grooves 29 (see, in particular, Fig. 7 and Fig. 9).

As can also be seen from FIG. 9, the assembly sections 18, 52 in the shown are actual corner profiles consisting of an angle piece 66 having a substantially W-shaped cross-section 68, the first sides of which 70 on the facing sides 69 of the center 72 of the W-shaped cross-section 68, comprises the protruding locking knobs 60, and whose parallel extending, contiguous other sides 53 comprise the stop faces 54, the faces of which are mutually orthogonally oriented, as shown in FIG. 7 and more clearly of FIG. 9th

As shown in FIG. 6, and more clearly in FIG. 8, the side facing the wall 8 of the W-shaped assembly sections 18, 52 comprises an outwardly sloping course 74 which is terminated by a parallel flange 76 extending parallel to the stiffening ribs, bounded by the parallel extending continuous sides 53 of the center 72 of the W-shaped cross-section 68 facing side and extending a little outside the outward-facing sides of the W-shaped corner profile. In addition, the assembly sections 18, 52 will follow the rectangular profile bodies 24 of which the panel sections 10, 12, 14, 16 are formed. Furthermore, as can be seen from FIG. 6 and FIG. 7, the impact flange 76 is reinforced with ribs 78 on the side oriented against the wall 8, making the impact flange 76 stronger and capable of absorbing torque forces.

In a not shown embodiment of the window frame according to the invention, the stop flange may comprise openings for receiving fasteners intended for retraction in the wall 8 around the opening 6 around which the window light 2 is to be mounted.

In FIG. 11-15, it is shown how the support legs 20 of the window frame 2 according to the invention are inserted and secured in one of the cut grooves 29 in the first outer surface 19, which support legs 20 each comprise a first base course 80 which extends at a course length 82 forming a first angle \ Λ with the first base run 80, which run length 82 transitions into a second base run 84 which forms a second angle V2 with the run length, and where the sum of the first angle \ Λ and the second angle V2 is 90 degrees, which first base run 80 includes a the cut grooves 29 cooperating locking knob 86, for insertion into a current slot-shaped opening 50 in a current cut groove 29 perpendicular to the first outer surface 19, and locking in the same current groove 29, by a 90 degree rotation of the support leg 20.

As can be seen clearly in FIG. 11-14, the second base course 84 of the support leg 20 comprises apertures 88 for receiving fasteners intended for retraction in the wall 8 around the aperture 6 in the wall 8.

As shown in FIG. 16-19, but most clearly of FIG. 18 and FIG. 19, the panel sections 10, 12, 14, 16 further comprise at least one other cut groove 90, the opening 92 of which appears as slots in the second inner outer surface 21. The other cut groove 90 is intended for attaching clips 22 to the window frame.

The window mounting clips 22 of the invention for clamping and arranging 22 in the second cut groove 90 of the second inner outer surface 21 are constituted by an elongated, plate-shaped blank 96 having a first flat side 100 and a second flat side 102, with a first flat side end 104 and a second flat side end 106, as well as a first longitudinal surface 108 and a second longitudinal surface 110, wherein the first flat side 100, near the first flat side end 104, comprises an interlocking slot 90, cooperating locking knob 91, for insertion into the second undercut groove 90 in a position where the longitudinal faces 108, 110 of the plate member 96 are oriented parallel to the second undercut groove 90, and a locked position where said longitudinal surfaces 108, 110 are oriented transversely of the second undercut groove 90.

In a not shown embodiment of the window frame according to the invention, the elongated plate member 96 comprises, close to the second flat side end 106, openings for receiving fasteners intended for retraction in the wall 8 around the opening in the wall for the window light 2.

In order to achieve a low weight for the window frame according to the invention, it is preferred that the panel sections 10, 12, 14, 16, the assembly sections 18, the support legs 20 and the clips 96 are made of extruded and molded plastic parts.

Typically, a window frame according to the invention will be delivered to a building site as "flat-pack", with the panel sections 10, 12, 14, 16 adapted to a current opening 6 in a wall 8. After unpacking the window frame 2 according to the invention, the panel sections 10 are inserted. , 12, 14, 16 by means of the connecting sections 18, by inserting the locking knobs 60 into the thus cooperating cut grooves 29, so that the first ends 11 and second ends 13 of the panel sections 10, 12, 14, 16 are brought into contact with the stop surfaces 54 on the junction sections 18, whereby the parallel-extending cavities 28 will appear closed, thereby insulating the window frame. The wedge-shaped portion 62 of the locking lugs 60 facilitates the insertion of the locking lugs 60 into the cut grooves 29 in the first outer surfaces 19.

When assembly of the window frame 2 is completed, the support legs 20 are inserted into one of the cut grooves 29 in the first outer surface, by inserting the support leg locking knob 86 into the relevant slot-shaped opening 50. The locking knob 86 is generally rectangular in its basic shape and is positioned on a stem whose length is substantially equal to the thickness of the applied side of the undercut groove. The width of the locking knob 86 is adapted so that it can pass through the slot-shaped openings 48, 50 in the first outer surfaces 19 of the panel sections 10, 12, 14, 16, and protrude into the undercut grooves 29. In this position, a 90 degree rotation of the support leg 20, thereby shifting the second base course 84 of the support leg 20 to a position where it proceeds in the same plane 83 (see Fig. 15) as the wall-oriented part of the window frame 2.

Thereafter, clips 22 are inserted into the second cut groove 90 into the second inner outer surface 21. The clips 96 comprise a locking knob 91 (indicated in Fig. 18) which in the configuration corresponds to the locking knob 86 described for the support leg 20 and the clips are fixed in the other undercut grooves 90 in the same manner as described above.

Thereafter, the thus assembled prepared window frame 2 according to the invention is lifted up to the relevant opening 6 in a wall 8, after which it is secured by fasteners which are guided / driven through the openings 88 in the other basic courses 84 on the support legs 20 and into the wall 8, and by fasteners driven through the clips 96 and into the wall 8 of the opening 6 of the window light 2. Thereafter, it will be possible to mount a window, with a frame etc. in the now mounted window light 2.

The inventor has recognized that the window illumination 2 according to the invention can take other forms than the one described above and shown in the drawing. For example, the width and thickness of the panel sections may vary, as can the number of cavities and undercut grooves. However, this does not change the inventive aspect of a window frame, the weight of which is considerably lower than the known window frames on the market, which are easy to assemble and form if this should exceptionally prove necessary, with simple tools, e.g. a saw and whose insulating capabilities are significantly better without compromising the strength of the window frame.

Claims (12)

1. Prefabricated window frame (2) of the type composed of a plurality of panel sections (10, 12, 14, 16) suitable for fitting and placing around a current opening (6) in a wall (8), said panel sections (10, 12, 14, 16) are assembled by thus cooperating assembly sections (18) so that the panel sections (10, 12, 14, 16) and assembly sections (18) jointly form the frame (2) for a suitable opening (6) window (7) and which frame (2) comprises means (20, 96) for anchoring it to the wall (8) and to the sides of the opening, characterized in that the panel sections (10, 12, 14, 16) of a current window frame ( 2) comprises a plurality of elongated profile bodies (24) of the same width, with a first end (11) and a second end (13), a first long side (15) and a second long side (17), and a first outer surface ( 19) and another inner outer surface (21), which elongate profile bodies (24) comprise a plurality of parallel extending cavities (28, 30, 32, 34, 36) with open ends, a number of which are divided into a cavity (28), respectively, and first cut grooves (29), the openings (48) of which appear as slots (50) in the first outer surface (19) and which include sections (18) protruding locking lugs (60) cooperating with the first cut grooves (29) in the elongate profile bodies (24), and which connecting sections (18) further comprise a first stop surface (54) and a second stop surface (54) cooperating with the the first ends (11) and other ends (13) of elongated profile bodies, against which stop surfaces (54), relevant ends (11, 13) of the profile bodies (24) are in full alignment, in the overall window frame (2). A window frame (2) according to claim 1, characterized in that the locking knobs (60) at the end closest to the panel section (24) have a wedge-shaped configuration (62) and which the outermost circumference and geometry of the locking knives at least correspond to the geometry of the first undercut tracks (29). A window frame (2) according to claim 1 or 2, characterized in that the connecting sections (18) are made of actual corner profiles (52) consisting of an angle piece with a substantially W-shaped cross-section (68), the first sides of which (70) on the sides facing the center (72) of the W-shaped cross-section, the protruding locking lugs (60) comprise, and whose parallel, continuous other sides comprise the stop faces (54) whose surfaces are mutually orthogonally oriented. Window frame (2) according to claim 3, characterized in that the other outward-facing sides of the W-shaped corner profiles (18, 52) comprise spaced stiffening ribs (56). Window mount (2) according to any one of claims 1-4, characterized in that the side-facing side of the W-shaped corner profiles (18, 52) comprises an outwardly sloping course (74) which terminates with a , with the stiffening ribs (56), a parallel flange (76) bounded by the parallel extending sides (70, 53) on the side facing the center (72) of the W-shaped cross-section (68) and which protruding slightly beyond the outward sides of the W-shaped corner profile (18, 52). Window mount (2) according to claim 5, characterized in that the stop flange (76) comprises openings for receiving fasteners intended for retraction in the wall around the opening of the window. A window mount (2) according to any one of claims 1-6, characterized in that it further comprises a plurality of support legs (20) for placement and mounting in one of the cut grooves (29) in the first outer surface ( 19), which support legs (20) each comprise a first base course (80) transitioning in a path length (82) forming a first angle / with the first base path (80), which path length (82) exceeds a path length (82) a second base course (84) forming a second angle V2 with the course length (82) and wherein the sum of the first angle Vi and the second angle V2 is 90 degrees, said first base course (80) comprising a locking member cooperating with the cut grooves (29). (86) for insertion into a current slot-shaped opening (29) into a current slot-shaped groove (50) perpendicular to the first outer surface (19), and locking in the same current slot (29), by a 90 degree rotation of the support leg (20). ). Window mount (2) according to claim 7, characterized in that the second basic course (84) comprises apertures (88) for receiving fasteners intended for retraction in the wall (8) around the opening (6) in the wall (8). A window frame (8) according to any one of claims 1-8, characterized in that the panel sections (24) further comprise at least one second cut groove (90), the opening of which appears as slots in the second inner outer surface. (21). A window frame (2) according to claim 9, characterized in that it further comprises a plurality of clips (22) for placement and arresting in the second cut groove (90) in the second inner outer surface (21), which clips (22) constitute of an oblong, plate-shaped blank (96) having a first flat side (100) and a second flat side (102), with a first flat side end (104) and a second flat side end (106), and a first long side surface (108) and a second longitudinal surface (110), wherein the first flat side (100) near the first flat side end (104) comprises a cooperating locking knob (91) with the second cut groove (90) for insertion into the second cut cut (90). grooves in a position where the longitudinal surfaces (108, 110) of the plate-shaped blank (96) are oriented parallel to the second undercut groove (90), and a locked position where said longitudinal surfaces (108, 110) are oriented transversely of the second undercut. track (90). A window frame (2) according to claim 10, characterized in that the elongated plate-shaped part (96) comprises, close to the second surface-side end (106), openings for receiving fasteners intended for retraction in the wall (8) around the opening (6) in the wall (8). A window frame (2) according to any one of claims 1 to 11, characterized in that the panel sections (10, 12, 14, 16, 24), the assembly sections (18), the support legs (20) and the clips ( 22) is made up of extruded and molded plastic parts.