Composite frame for a window or door

Description

[0001] The invention relates to a composite frame for a window or a door with an outer front frame made of metal profiles connected to one another in the miter area and a base frame made of plastic profiles welded to one another in the miter area. Technical area

[0002] PVC has established itself as a material for frame profiles used in the manufacture of windows and doors in many markets due to its efficient processing and product durability. PVC profiles are generally mitered and welded together at the mitered joint to form a frame. At least at larger processors, the production of window and sash frames from PVC profiles usually takes place on complex production lines in which the individual work steps are carried out one after the other in a timed sequence. To enable efficient production, no individual work step can take significantly longer than others, as otherwise the entire production line would have to operate at a correspondingly slower speed.

[0003] The use of facings or frames made of metal profiles, especially aluminum profiles, is common practice for both wooden and plastic windows. Covering plastic profiles with aluminum facings or frames is primarily done for aesthetic reasons, and the aluminum facings or frames can be anodized, painted, or otherwise coated in various colors.

[0004] In this application, facing shells are defined as individual facing profiles which are individually placed on the legs of a base frame and connected to it - without being connected to each other in the corner or mitre area.

[0005] In this application, "front frames" refer to prefabricated frames made of front profiles that are joined together to form a fixed front frame before being connected to or placed on a base frame in the corner or miter area. The corner connection can be achieved, for example, using special corner brackets, as known from DE 100 08 037 B4, DE 88 08 313 U1, or EP 1 914 375 B1, or, in particularly high-quality designs, by welding in the miter area. State of the art

[0006] Plastic frames for a window or door with individual outer facings that are not connected to each other before being placed on the base frame are known, for example, from EP 1 877 640 B1 or DE 100 02 658 A1. However, placing and connecting individual facings on a prefabricated plastic base frame is generally quite time-consuming, especially when the connection is made using adhesives, screws, or additional fasteners. Such constructions therefore cannot be efficiently processed on conventional production lines.

[0007] EP 2 594 720 B1 discloses a generic composite frame for a window in which an inner and an outer front frame are connected to a base frame by a snap-in or clip-on connection. However, due to the different thermal expansion of aluminum and plastic and unavoidable tolerances in the manufacture of the base and front frames, this design is problematic in practice.

[0008] A similar solution is known from WO 2019 / 052987 A1. Here, the front frames are connected to the plastic base frame using double locking bars. Here, too, the different thermal expansions of aluminum and plastic, as well as the compensation of tolerances, pose problems.

[0009] EP 1744001 A1 and DE 3032939 A1 each disclose composite frames in which a facing profile is connected to a PVC main profile. In each case, the facing profile is connected to the PVC profile via a snap-in connection with two opposing locking lugs. The locking lugs are designed such that a rigid connection is created in the locked position. Task

[0010] The object of the present invention is therefore to provide a generic composite frame for a window or a door in which different thermal expansions of the metal front frame and the plastic base frame as well as any tolerances in the manufacture of the respective frames can be compensated and, in addition, a rational connection between the base frame and the front frame is made possible even on appropriately timed production lines. Description of the invention

[0011] The invention solves this problem by a composite frame according to claim 1, preferably in conjunction with one or more of the features of the subclaims.

[0012] The composite frame according to the invention for a window or a door thus initially comprises an outer front frame made of metal profiles connected to one another in the corner area and a base frame made of plastic profiles welded to one another in the mitre area.

[0013] The metal profiles are preferably mitered in the corner area, but can also be butted together in principle. They are firmly connected to each other in the corner area, preferably using commercially available corner connectors, which are connected to the metal profiles via clamping screws, eccentric elements, beading, gluing, or similar. According to a particularly preferred embodiment of the invention, the individual metal profiles are welded together in the corner area to form particularly high-quality facing frames.

[0014] The metal profiles or the front frames formed from them are preferably finished on the visible outside by anodizing, painting or other coating.

[0015] The base frame according to the invention consists of plastic profiles welded together in the mitre area, in particular hollow chamber profiles extruded from rigid PVC (PVC-U).

[0016] The base frame and the front frame used according to the invention each have means that together form a locking function, so that the front frame and the base frame can be connected to one another during assembly by means of the locking function thus formed. It is essential to the invention that this locking function is designed such that, before the panel is inserted, the front frame is arranged so that it can be displaced relative to the base frame in a plane parallel to the panel plane, with the degree of displaceability preferably being between a few tenths of a millimeter and a few millimeters.

[0017] The front frame has exactly one circumferential locking lug, which, together with a corresponding circumferential undercut in the base frame, forms the only locking function between the front frame and the base frame. This ensures, in a particularly advantageous way, that the necessary sliding capability of the front frame relative to the base frame is ensured before the panel or glazing is inserted and secured.

[0018] According to a preferred embodiment of the invention, the metal profiles forming the front frame have a relatively stiff, but at least to a certain extent elastic web with a locking lug, while the plastic profiles forming the base frame have an undercut or the like and thus, together with the webs and locking lugs of the front frame, form the locking function according to the invention.

[0019] Welding the plastic profiles in the mitered area can impair the function of the undercut in the corners due to the weld beads. However, the usual cleaning of the mitered areas of the base frame usually removes the weld beads in the undercut area anyway. If necessary, the surrounding elastic web can be notched with the locking lug of the front frame in the corner area to ensure that the front frame locks to the base frame even under unfavorable conditions.

[0020] According to a preferred embodiment of the invention, the base frame has a recess on its outer side and spaced apart from the undercut (as viewed in cross-section). This recess, together with a support cam of the front frame projecting into the recess (as viewed in cross-section), limits the displacement of the front frame relative to the base frame. This facilitates the locking of the front frame and the base frame and prevents the front frame from disengaging before the panel is inserted.

[0021] According to a preferred embodiment of the invention, the composite frame according to the invention is designed as a casement frame. According to a particularly preferred embodiment of the invention, the front frame also simultaneously forms the external stop for the filling or glazing. On the inside, a conventional glazing bead preferably serves to hold the filling or glazing. A corresponding glazing bead receiving groove on the inside of the rebate area of the plastic profiles from which the base frame is formed serves, in particular, to accommodate the glazing bead.

[0022] The filling is preferably multiple glazing, especially triple glazing. However, it is also fundamentally within the scope of the present invention to use a different filling, such as a highly insulating foam board. Where the terms "filling plane" or "glazing plane" are used in this application, this refers to the plane that runs centrally between the outer and inner surfaces of the filling or glazing and parallel to these surfaces.

[0023] The composite frame according to the invention has a rebate area, which is formed in part by the front frame and in part by the base frame. According to a preferred embodiment of the invention, the block bridges or glazing blocks used rest on both the rebate area of the front frame and the rebate area of the base frame for at least 10% of their width.

[0024] A number of block bridges and / or glazing blocks are used to secure the infill or multiple glazing in the rebate area of the composite frame. Block bridges are used in particular when the rebate area is not flat and / or not exactly horizontal. Block bridges are not required if the rebate area is largely flat and runs horizontally, i.e. perpendicular to the glazing plane. The block bridges therefore serve to create a horizontal and level surface for the actual glazing blocks to rest on. The glazing blocks are usually inserted at different heights in the circumferential gap between the circumferential end face of the infill or glazing and the top side of the block bridges or the rebate area in order to compensate for tolerances in the frame in the rebate area and / or the external dimensions of the glazing or infill.

[0025] In addition to this blocking, the infill or multiple glazing can be bonded to the rebate area of the base frame in a conventional manner. In addition to or independently of the bonding in the rebate area of the base frame, the infill or multiple glazing can also be bonded to the face frame, for example, using double-sided adhesive tape, which is used instead of or in addition to a glazing seal.

[0026] By inserting the panel and securing it with the blocks in the rebate area formed jointly by the front frame and the base frame, the invention simultaneously centers the front frame relative to the base frame and at least largely fixes it. "Largely fixes" means that the degree of movement of the front frame relative to the base frame is limited to such an extent that the locking function is ensured even when exposed to typical temperature fluctuations and forces and moments transmitted by the glazing.

[0027] According to a preferred embodiment of the invention, the rebate area runs essentially flat and at the same height level running perpendicular to the glazing plane both in the partial area formed by the front frame and in the partial area formed by the base frame, so that a block bridge can be dispensed with if necessary. Short description of the drawing

[0028] The invention is explained in more detail below using an exemplary embodiment and the drawings. In the drawings: Fig. 1 shows a cross-section of a window with a composite frame according to the invention; Fig. 2 shows a metal profile for producing the front frame in cross-section; Fig. 3 shows a front frame and a base frame according to the invention before locking; Fig. 4 shows a front frame and a base frame according to the invention after locking; Fig. 5 shows the front frame in an external view. Best way of carrying out the invention

[0029] The Fig. 1 The window 1 shown has, in addition to the composite frame 2 according to the invention, designed as a sash frame 14, a conventional frame 28 equipped with a central seal 32. Of course, the frame 28 can also be provided with a facing shell or a facing frame made of metal, in particular aluminum.

[0030] The Fig. 1The sash frame 14 shown in cross-section essentially consists of the base frame 13, the front frame 3, the filling 23 designed as a multiple glazing 25, and the glazing bead 27. The base frame 13 is formed from four plastic profiles 15 made of rigid PVC (PVC-U) welded together in the mitre area. The plastic profiles 15 have a large central reinforcement chamber 30 for accommodating a steel reinforcement 29, as well as a plurality of additional chambers, which in particular provide for greater thermal insulation of the base frame 13. The rebate area 19 of the base frame 13 is, as shown particularly in the Figs. 3 and 4shown, largely flat, in the illustrated embodiment including the inner area with the glazing bead receiving groove 22. This largely flat design of the rebate area 19 of the base frame 13 facilitates in particular an optional bonding of the filling 23 or multiple glazing 25 in the rebate area 19 (not shown in the figures).

[0031] The plastic profiles 15 or the base frame 13 have - in cross section according to Fig. 1 , 3 and 4viewed from the outside, in the upper area facing the rebate area 19, an undercut 16 which, when viewed from the base frame 13, forms a circumferential undercut edge that serves to hook the locking lug 6 of the front frame 3. The plastic profiles 15 or the base frame 13 furthermore have - also viewed in cross-section - a recess 17 on the outside and spaced from the undercut 16. This recess 17 serves, as will be explained in more detail below, as a bearing surface for the support cam 8 of the front frame 3.

[0032] The one in the Fig. 1 The front frame 3 shown in Figures 3 to 5 consists of four mitered metal profiles 4 that are firmly connected to each other in the corner area via corner connectors 31, which in the illustrated embodiment are made of aluminum. The corner connectors 31 used are commercially available and constructed similarly to the connectors in EP 1 914 375 B1.

[0033] The metal profiles 4 are in Fig. 2 shown separately in cross-section: They have a flat outer visible surface 5, which in the installed state runs parallel to the glazing plane 24, an upper slope 34 pointing slightly obliquely towards the multiple glazing 25, a receiving groove 11 for a glazing seal 12 and a receptacle 10 for receiving the corner connectors 31. On the inner side of the metal profile 4, opposite the outer visible surface 5 when viewed in cross-section, this has a web 7 running perpendicular to the glazing plane 24, at the end of which the locking lug 6 is arranged. As can be seen particularly in the Figs. 3 and 4As can be seen, the front frame 3 is designed so that the upper side of the web 7 runs at the same height as the rebate area 19 of the base frame 13. The metal profiles 4 have, in addition to the web 7, a leg 9 which runs essentially parallel to the glazing plane 24 and thus perpendicular to the web 7, which leg 9 completely covers the outside of the base frame 13 in the finished composite frame 2 and ends in the support cam 8.

[0034] To mount the front frame 3 on the base frame 13, as shown in the Figs. 3 and 4 As can be seen, the front frame 3 is pressed onto the base frame 13 with a movement perpendicular to the glazing plane 24, whereby the web 7 with its locking lug 6 is slightly - in cross section according to Figs. 3 and 4viewed from the outside - is bent upwards and springs back behind the undercut 16. The support cam 8 rests against the recess 17 on the base frame 13 and simultaneously transfers the forces and moments acting from the multiple glazing 25 via the glazing seal 12 onto the front frame 3 to the base frame 13.

[0035] As particularly in the Fig. 4 As can be seen, the locking function formed by the web 7 and locking lug 6 on the one hand and the undercut 16 on the other hand is designed with a certain amount of play, so that the front frame 3 can be displaced upwards and downwards relative to the base frame 13 by a certain amount - viewed in cross section - ie the front frame 3 can be displaced to a certain extent in all directions in a plane that lies parallel to the glazing plane 24. This displaceability is limited by the extent to which the locking lug 6 engages the web 7 - viewed in cross section according to Fig. 4viewed - projects downwards and by the distance between the support cam 8 of the front frame 3 and the edge 35 of the recess 17. The extent of this displaceability of the front frame 3 relative to the base frame 13 can compensate for considerable tolerances and different thermal expansions of the front frame 3 and the base frame 13.

[0036] After the front frame 3 and base frame 13 are locked together, the composite frame 2 is glazed in the conventional manner using block bridges and / or glazing blocks 26. For this purpose, the multiple glazing unit 25 is first inserted into the rebate area 18 of the composite frame 2 and secured in the composite frame 2 using a corresponding number of block bridges and / or glazing blocks 26. The circumferential end face 33 of the multiple glazing unit 25 is thus supported on the rebate area 18 via the block bridges and / or glazing blocks 26.

[0037] As particularly in Fig. 1As can be seen, the block bridges or glazing blocks 26 are located both on the - in cross section according to Fig. 4 viewed from the side - upper side of the web 7 of the front frame 3 as well as in the rebate area 19 of the base frame 13. The upper side of the web 7 thus forms the rebate area 20 of the front frame 3. Because the blocking rests on the circumferential leg 7 of the front frame 3, the front frame 3 is simultaneously centered relative to the base frame 13 and at least largely fixed, so that the locking lug 6 cannot be moved over the upper edge of the undercut 16 even under unfavorable conditions such as extreme temperature influences and high tilting moment transmitted from the multiple glazing 25 via the glazing seal 12 to the front frame 3.

[0038] The Fig. 1 , 3 and 4The rebate base seal 21 shown divides the rebate area 18 into an outer and an inner rebate area and thereby increases the thermal insulation of the window 1. In the area of the blocking, the rebate base seal 21 is pressed down into the recessed rebate area and therefore does not negatively affect the blocking. legend

[0039] 1 Window 2 Composite frame 3 Face frame 4 Metal profile 5 External visible surface 6 Locking lug 7 Web 8 Support cam 9 Leg 10 Corner connector mount 11 Glazing seal groove 12 Glazing seal 13 Base frame 14 Sash frame 15 Plastic profile 16 Undercut 17 Recess 18 Rebate area (composite frame) 19 Rebate area (base frame) 20 Rebate area (face frame) 21 Rebate base seal 22 Glazing bead mounting groove 23 Infill 24 Infill level / Glazing level 25 Multi-pane glazing 26 Glazing block 27 Glazing bead 28 Frame 29 Steel reinforcement 30 Reinforcement chamber 31 Corner connector 32 Center seal 33 Front face 34 Bevel 35 Edge

Claims

1. Composite frame (2) for a window (1) or a door, comprising - an outer auxiliary frame (3) made of metal profiles (4) which are connected to each other in the corner region and - a base frame (13) made of plastics material profiles (15) which are welded to each other in the mitre region, - a rebate region (18) for receiving a filling (23), - a filling (23) which defines a filling plane (24), in particular a multiple glazing (25), having a circumferential end face (33), - a plurality of glazing bridges and / or glazing blocks (26) for fixing the end face (33) of the filling (23) in the rebate region (18) of the composite frame (2), wherein - the auxiliary frame (3) and the base frame (13) in each case have means which together form a locking function so that the auxiliary frame (3) and the base frame (13) can be connected to each other by means of the locking function during the assembly, - the rebate region (18) is formed in a part-region by the auxiliary frame (3) and in a part-region by the base frame (13), - the locking function between the auxiliary frame (3) and base frame (13) is configured in such a manner that, after the connection of the auxiliary frame (3) to the base frame (13) and before the filling (23) is inserted, the auxiliary frame (3) is arranged displaceably with respect to the base frame (13) in a plane parallel with the filling plane (24), and - by inserting and fixing the filling (23) in the rebate region (18) which is formed together by the auxiliary frame (3) and the base frame (13) the auxiliary frame (3) is centred and at least substantially fixed with respect to the base frame (13), - characterized in that - the auxiliary frame (3) has a single circumferential locking projection (6) which with a correspondingly circumferential undercut (16) of the base frame (13) forms the single locking function between the auxiliary frame (3) and base frame (13).

2. Composite frame (2) according to Claim 1, characterized in that the rebate region (18) both in the part-region which is formed by the auxiliary frame (3) and in the part-region which is formed by the base frame (13) extends in a substantially planar manner, perpendicularly to the filling plane (24) and at the same height level.

3. Composite frame (2) according to Claim 1 or Claim 2, characterized in that the plurality of glazing bridges or glazing blocks (26) are positioned at a rate of at least 10% of the width thereof both on the rebate region (20) of the auxiliary frame (3) and on the rebate region (19) of the base frame (13).

4. Composite frame (2) according to any one of Claims 1 to 3, characterized in that the composite frame (2) is in the form of a casement frame (14) and the auxiliary frame (3) is in the form of an outer abutment for the filling (23).

5. Composite frame (2) according to any one of Claims 1 to 4, characterized in that at the inner side a glass retention strip (27) acts as an abutment for the filling (23).

6. Composite frame (2) according to Claim 5, characterized in that the base frame (13) has on the outer side thereof and with spacing from the undercut (16) - when viewed in cross section - a recess (17) which together with a support cam (8) of the auxiliary frame (3) - when viewed in cross section - protrudes into the recess (17) brings about a limitation of the displaceability of the auxiliary frame (3) with respect to the base frame (13).

7. Composite frame (2) according to any one of Claims 1 to 6, characterized in that the auxiliary frame (3) is composed of individual metal profiles (4) which are mitre cut and which are securely connected to each other in the corner region with corner connectors (31) and / or by means of welding.

8. Composite frame (2) according to any one of Claims 1 to 7, characterized in that the auxiliary frame (3) has a receiving groove (11) for a glazing seal (12).

9. Composite frame (2) according to any one of Claims 1 to 8, characterized in that the filling (23), in particular a multiple glazing (25), after inserting and fixing the filling (23) in the rebate region (18) formed together by the auxiliary frame (3) and the base frame (13) in the rebate region (19) of the base frame (13) is connected thereto by means of adhesive bonding.

10. Composite frame (2) according to any one of Claims 1 to 9, characterized in that the filling (23), in particular a multiple glazing (25), is connected to the auxiliary frame (3) by adhesive bonding.