Corner connector

Abstract

A corner connector (10) for a hollow profile (12) of a door or window frame is provided, comprising a shaft (14) for insertion into the hollow profile (12) along a longitudinal axis of the shaft (14), a weld surface (18) formed on an end face of an end section (16) of the shaft (14) and extending at least partially parallel to a miter (34) of the hollow profile (12), and a fastening device (22), wherein the shaft (14) has a recess (20) on its surface for receiving the fastening device (22).wherein the fastening device (22) and the shaft (14) each have at least one passage (23) extending orthogonally to the longitudinal axis of the shaft (14) for the passage of a screw (24) extending orthogonally to the longitudinal axis of the shaft (14) through the hollow profile (12) for force-fit and form-fit fastening of the fastening device (22) and the shaft (14) within the hollow profile (12). The corner connector (10) enables door or window frames with high load-bearing capacity and long service life.

Description

[0001] The present invention relates to a corner connector for a hollow profile of a door or window frame, a corner connector arrangement for a door or window frame, a frame construction for a door or window, with the aid of which the load-bearing capacity and service life of door or window frames can be improved.

[0002] Frame profiles for doors and windows are often made of plastic. Plastic frames have lower thermal conductivity than metal frames. Accordingly, plastic frames promote good thermal insulation of doors and windows. To seal the plastic frames and ensure thermal insulation, the individual hollow profiles that form the frame are welded together along the miter. For larger doors or windows, additional metal stiffening profiles can be installed in the individual hollow profiles of the frame. In this way, the load-bearing capacity of the frame can be increased while maintaining the same thermal insulation. To improve the torsional strength of the plastic frame, the stiffening profiles are usually connected to each other using corner connectors.For this purpose, a first corner connector is inserted into one end of a first stiffening profile and is frictionally fastened to the inner surfaces of the first stiffening profile via a locking device. Fastening is usually achieved using wedges, the displacement of which along an inclined surface of the corner connector results in a contact force acting outwards against the inner surface of the stiffening profile, or an expansion arrangement which, as a result of the insertion of a displacement body along the longitudinal axis of the corner connector, generates a contact force caused by the radial outward expansion of the corner connector and acting against the inner surfaces of the stiffening profile. The section of the corner connector not located in the stiffening profile is then pressed against a hot surface together with the adjacent hollow profile and melted along the miter.The first corner connector can then be pressed onto the first hollow profile, together with a second, essentially identical corner connector and a second hollow profile, thus forming a material bond. Accordingly, the individual hollow profiles of the frame are connected exclusively via the welded joint along the miter. After welding the hollow profiles, the corner connectors are thus inaccessible and no longer visible from the outside.

[0003] EP0415394A2 discloses a corner connector for plastic profiles, each with a fastening device for locking the corner connectors within the plastic profiles. The corner connector has a welding surface extending parallel to the miter of the plastic profiles for a material-to-material connection to another corner connector. EP1580390A2 discloses a connector for a hollow profile of a door or window frame according to the preamble of claim 1. EP2011949A2 also discloses a connector for a hollow profile of a door or window frame.

[0004] There is a constant need to improve the load-bearing capacity and service life of door or window frames.

[0005] The object of the invention is to demonstrate measures that enable a high load-bearing capacity and service life of door or window frames.

[0006] The object is achieved by a corner connector having the features of claim 1, a corner connector arrangement having the features of claim 10 and a frame construction having the features of claim 12. Preferred embodiments of the invention are specified in the subclaims and the following description, which may each individually or in combination represent an aspect of the invention.

[0007] One embodiment relates to a corner connector for a hollow profile of a door or window frame, comprising a shaft for insertion into the hollow profile along a longitudinal axis of the shaft, a welding surface formed on an end face of an end section of the shaft and extending at least partially parallel to a mitre of the hollow profile for materially bonding to another body, a fastening device for locking the shaft within the hollow profile, wherein the shaft has a recess on its surface for receiving the fastening device,wherein the fastening device and the shaft each have at least one passage extending orthogonally to the longitudinal axis of the shaft for the passage of a screw extending orthogonally to the longitudinal axis of the shaft through the hollow profile for the non-positive and positive fastening of the fastening device and the shaft within the hollow profile.

[0008] Door or window frames usually have four individual hollow profiles that can be joined together at the miters to form a square frame. The hollow profiles can be made of plastic in particular. This can improve the thermal insulation of doors and windows and significantly reduce the weight of the frames. Unlike hollow profiles made of metal, hollow profiles made of plastic are welded together at the miters to create a material-to-material bond. This gives the door or window frame an aesthetic appearance and improves gap sealing along the miter. The assembly of hollow profiles made of plastic involves first melting the hollow profiles along the miter using thermal heat and then immediately pressing them together to create a material-to-material bond.This process means that existing corner connectors, such as L-shaped corner connectors as used in aluminum frames, cannot be mounted on the end faces of the hollow profiles before and after melting. Pre-assembly of existing corner connectors within the hollow profiles would prevent the melting process along the miter. After melting of the hollow profiles, the end faces of the hollow profiles are deformed along the miter to such an extent that rapid insertion of the existing corner connectors for aluminum frames is no longer possible due to the tight tolerances. The hollow profiles can have one or more cavities extending parallel to the longitudinal axis of the hollow profiles. The cavities can be separated from one another by wall sections with different wall thicknesses.This allows a material-to-material connection to be made at the miter via the end faces of the walls surrounding the cavities. The side walls can have a wall thickness of a few millimeters, in particular less than 10 millimeters, particularly preferably less than 5 millimeters, whereby the hollow profiles only have a very small area for welding. In principle, a larger area promotes a stronger connection of the hollow profiles along the miter when welding. The arrangement of the corner connectors according to the invention in the individual hollow profiles thus has a welding surface for material-to-material connection formed on an end face of an end section of the shaft and extending at least partially parallel to the miter of the hollow profile. The corner connector can be made at least partially from plastic or the like. In particular, the corner connector can be made of plastic in the region of the welding surface.The welding surface formed on the end face of the shaft is designed in particular to be welded to a welding surface of a corner connector arranged in an adjacent hollow profile and essentially identical in design. Essentially identical in design means that the corner connectors can be geometrically similar or identical, although the number and arrangement of passages, openings and / or recesses on the respective corner connectors can vary. The welding surface of the corner connector enables a better connection between the individual hollow profiles of the door or window frame. This immediately enables a higher load-bearing capacity of the door or window frame. The recess on the surface of the shaft promotes secure accommodation of the fastening device.The fastening device can be arranged completely below the edge of the recess or only partially in the recess. A relative movement of the fastening device to the shaft that is directed orthogonally and / or parallel to the longitudinal axis of the shaft can be limited essentially indirectly or directly by the inner surfaces of the recess. The fastening device can thus be inserted into the hollow profile together with the shaft and moved therein. The recess additionally ensures that the at least one opening in the shaft and the at least one opening in the fastening device at least partially overlap to accommodate the screw within the hollow profile. This enables simple and secure installation of the corner connector in the hollow profile.Through at least one opening in the shaft and the fastening device, both the shaft and the fastening device can be fastened in the hollow profile using the screw in a force-fitting and form-fitting manner. This prevents the shaft from becoming loose and sliding out of the hollow profile when the door or window frame is operated or as a result of high loads. The screw can extend through the entire hollow profile up to the exit from the hollow profile or only through part of the hollow profile. For this purpose, the hollow profile has at least one screw opening extending orthogonally to the longitudinal axis of the hollow profile for the screw to pass through. The screw head can rest against an outer surface of the hollow profile or against a wall within a cavity of the hollow profile. This allows the hollow profile to be connected to the corner connector in a form-fitting and force-fitting manner.The screw can be inserted into the hollow profile orthogonally to the longitudinal axis of the shaft. This allows the screw to be positioned on the hollow profile so that it is accessible from the outside. This allows for subsequent adjustment of the door or window frame via the corner connector. The corner connector thus ensures a high load-bearing capacity and a long service life for the door or window frame.

[0009] In order to improve the load-bearing capacity of the door or window frame, a stiffening profile can be arranged in each of the individual hollow profiles of the door or window frame. The stiffening profile can in particular be made of a material with a higher strength than that of the hollow profile. The stiffening profile is preferably made of a metal alloy, particularly preferably aluminum. The stiffening profile can have a square cross-section and can be inserted into a square cavity in the hollow profile. This allows the shaft of the corner connector to be arranged in the stiffening profile within the hollow profile and the stiffening profile, together with the shaft and the fastening device, to be connected to the hollow profile in a form-fitting and force-fitting manner using at least one screw. A separate fastening of the stiffening profile can therefore be dispensed with.The hollow profile and the stiffening profile can have at least one screw opening extending orthogonally to the longitudinal axis of the hollow profile. The at least one screw opening of the hollow profile and the stiffening profile can overlap with the at least one passage of the shaft and the fastening device in the hollow profile. This allows the screw to connect the hollow profile together with the stiffening profile, the shaft, and the fastening device in a form-fitting and force-fitting manner. The stiffening profile can also prevent the hollow profile from deforming as a result of material fatigue or high loads. The stiffening profiles in the individual hollow profiles can be securely connected to one another using corner connectors. This can further increase both the load-bearing capacity and service life of door or window frames.

[0010] The shaft and the welding surface of the corner connector can essentially be made of one piece and made of plastic. Plastic is lighter than metal, has good melting properties and provides the strength necessary for the door or window frame to be load-bearing. The use of corner connectors therefore does not significantly increase the weight of the door or window frame. The welding surface can be flat and uniform. In short melting processes in which the welding surface is only melted superficially, a uniformly shaped welding surface can enable a sufficiently strong material bond. The welding surface can, in particular, have a structure with depressions and elevations. The structuring of the welding surface allows the molten plastic to be distributed evenly along the welding surface during the melting process.The welding surface can, in particular, have a melting depth of at least 3 millimeters, extending parallel to the longitudinal axis of the shaft. This allows the plastic melt created during the melting process to flow into the depressions, thereby forming a substantially uniform welding surface. The miter can have an angle of 45 degrees to the longitudinal axis of the hollow profile. Thus, an angle of 45 degrees can also be formed between the welding surface and the longitudinal axis of the hollow profile. This allows the forces occurring at the miter in the door or window frame to be better transmitted between the individual hollow profiles. A person skilled in the art defines an angle of 45 degrees as an angle with a tolerance of 45 degrees + / - 5 degrees.

[0011] The fastening device can have a metal housing. The metal housing allows the shaft to be securely pressed against the hollow profile and / or the stiffening profile via the fastening device. The housing can be made of bent sheet metal and, in particular, can be U-shaped. This enables cost-effective production of the housing. The housing can have a wall thickness of less than or equal to 3 millimeters. The thin wall thickness promotes good formability of the housing. The fastening device can, in particular, be arranged within the hollow profile at a distance from an inner wall of the hollow profile or an inner wall of the stiffening profile. This facilitates the insertion of the shaft into the hollow profile.

[0012] In particular, the fastening device has at least one first threaded holder with an internal thread for the non-positive and positive reception of a thread of the screw extending orthogonally to the longitudinal axis of the shaft through the hollow profile. The at least one first threaded holder can be arranged, in particular, within the fastening device, without movement relative to the passage of the fastening device extending orthogonally to the longitudinal axis of the shaft. By means of the at least one first threaded holder, the thread of the screw extending orthogonally to the longitudinal axis of the shaft can be brought into positive and non-positive engagement with the internal thread of the first threaded holder.Due to the movement-free arrangement of the at least one first threaded holder, the thread of the screw can be brought into engagement with the internal thread of the at least one first threaded holder offset from the internal thread of the at least one first threaded holder and / or at an angle of up to 15 degrees to the central axis of the passage of the fastening device. The fastening device can be subjected to a contact force against the recess in the shaft by means of the screw. As a result, the shaft is indirectly force-fitted by the contact force of the screw against an inner wall of the hollow profile or the stiffening profile. Due to the engagement of the screw with the internal thread of the first threaded holder, the fastening device can be locked in a movement-proof manner within the hollow profile.The at least one passage on the shaft and the positive mounting of the fastening device in the recess enable a positive locking of the shaft within the hollow profile. In addition to the internal thread of the first threaded holder, the screw can extend through one screw opening or two screw openings located opposite one another in the hollow profile. This allows the screw to be arranged in a positive fit in the hollow profile at one screw opening or the two screw openings located opposite one another in the hollow profile. Due to the first threaded holder being arranged so as to be free of movement relative to the at least one passage, the screw can be more easily engaged with the internal thread of the first threaded holder. The passage of the fastening device can have a larger diameter than the internal thread of the first threaded holder.Due to the relative movement between the first threaded holder and the passage, the internal thread can be moved to any position within the diameter of the passage. The first threaded holder can, in particular, be arranged to be movable by at least 0.5 millimeters within the fastening device. This allows the screw to be quickly and easily engaged with the internal thread of the first threaded holder at any position in the passage. The first threaded holder can, in particular, be designed as a cuboid, prism, torus, or the like.

[0013] The fastening device is preferably arranged in the recess so as to be displaceable relative to the shaft. Due to the freedom of movement of the fastening device within the recess, deviations in the overlap of the at least one passage of the fastening device and the at least one passage of the shaft can be compensated for. In particular, the diameter of the at least one passage of the shaft can be larger than the diameter of the at least one diameter of the fastening device. This allows the screw to be quickly and easily inserted into the passage of the shaft and then passed through the passage of the fastening device. The fastening device can be displaced within the recess parallel to the longitudinal axis of the shaft.Movement of the fastening device orthogonal to the longitudinal axis of the shaft can be limited within the hollow profile by a positive fit between the inner surfaces of the recess and an inner wall of the hollow profile or the inner wall of the stiffening profile. This allows the position of the fastening device to be adjusted parallel to the longitudinal axis of the shaft within the recess, and the openings on the shaft and the fastening device to be brought into an overlapping position.

[0014] Particularly preferably, the fastening device and the welding surface each have at least one opening extending parallel to the longitudinal axis of the shaft for the passage of a screw extending parallel to the longitudinal axis of the shaft. The at least one opening has a central axis. The central axis of the at least one opening extends substantially orthogonal to a central axis of the at least one passage. As a result, the screw extending parallel to the longitudinal axis of the shaft can create a positive and non-positive connection between the corner connector and a hollow profile adjacent to the end face of the hollow profile. Advantageously, the door or window frame can also be subsequently adjusted using the screw in the at least one opening. As a result, in particular, the contact pressure between the individual hollow profiles at the miter can be adjusted at any time.

[0015] In particular, the fastening device has at least one second threaded holder with an internal thread for the non-positive and positive reception of a thread of the screw(s) extending parallel to the longitudinal axis of the shaft. The at least one second threaded holder can be arranged, in particular within the fastening device, without movement relative to the opening of the fastening device extending parallel to the longitudinal axis of the shaft. By means of the at least one second threaded holder, the thread of the screw extending parallel to the longitudinal axis of the shaft can be brought into positive and non-positive engagement with the internal thread of the second threaded holder.Due to the movement-free arrangement of the at least one second threaded holder, the thread of the screw can be brought into engagement with the internal thread of the at least one second threaded holder offset from the internal thread of the at least one second threaded holder and / or at an angle of up to 15 degrees to the central axis of the opening of the fastening device. The fastening device can be subjected to a contact force against an inner surface of the recess in the shaft by means of the screw. Due to the engagement of the screw with the internal thread of the second threaded holder, the fastening device can be connected in a force-fitting and form-fitting manner to a hollow profile adjacent to the end face of the hollow profile. The opening of the fastening device can have a larger diameter than the internal thread of the second threaded holder.Due to the relative movement between the second threaded holder and the opening, the internal thread can be moved to any position within the diameter of the opening. The second threaded holder can, in particular, be arranged to be movable by at least 0.5 millimeters within the fastening device. This allows the screw to be quickly and easily engaged with the internal thread of the second threaded holder at any position in the opening. The second threaded holder can, in particular, be designed as a cuboid, prism, torus, or the like.

[0016] The welding surface preferably has at least one recess extending orthogonally to the longitudinal axis of the shaft for the passage of a screw extending orthogonally to the longitudinal axis of the shaft through the hollow profile. By arranging the screw in the recess, the hollow profile can be connected in a force-fitting and form-fitting manner to a hollow profile adjacent to the end face of the hollow profile, in particular to a fastening device of the adjacent hollow profile, particularly preferably to a second threaded holder in the fastening device of the adjacent hollow profile. Advantageously, the door or window frame can also be subsequently adjusted using the screw in the at least one recess. This allows, in particular, the contact pressure between the individual hollow profiles at the miter to be adjusted at any time.

[0017] Particularly preferably, the at least one passage on the shaft, the at least one opening on the welding surface, and / or the at least one recess on the welding surface is / are at least partially conical to accommodate a respective screw. The conical access can simplify the insertion of the screw. The conical access can have a half opening angle φ of less than or equal to 15 degrees. As a result, the respective screw can be inserted into the respective passage, opening, and / or recess at an angle of less than or equal to 15 degrees to the respective central axis of the passage, opening, and / or recess.

[0018] In particular, the fastening device has a base body for receiving and positioning at least one of the first threaded holders with an internal thread and / or at least one of the second threaded holders with an internal thread within a housing. The base body can be made of plastic and can be connected to the housing in a form-fitting and / or force-fitting manner. The base body can in particular be clipped to the housing. This allows the base body to be connected to the housing without additional connecting elements. The base body can have at least one recess for receiving the at least one first threaded holder and / or the at least one second threaded holder. This allows the at least one first threaded holder and / or the at least one second threaded holder to be arranged captively in the fastening device.The at least one first threaded fastener and / or the at least one second threaded fastener can each be arranged within the fastening device so that it can move by at least 0.5 millimeters. This allows the at least one first threaded fastener and / or the at least one second threaded fastener to align with the respective thread of the screw, thus simplifying the insertion of the screw.

[0019] Preferably, the at least one opening and the at least one recess each have a central axis, wherein the central axis of the at least one opening and the central axis of the at least one recess extend substantially orthogonally and offset from one another through the welding surface. Due to the offset arrangement of the at least one opening relative to the at least one recess, the screws used can extend through the welding surface in a space-saving manner and without interfering with one another.

[0020] A further embodiment relates to a corner connector assembly for a door or window frame, comprising two corner connectors according to the features of the description, wherein the two corner connectors are integrally connected to one another via their respective welding surfaces. This allows the individual hollow profiles and / or the stiffening profiles of the door or window frame to be connected to one another at the miter. The integral connection can increase the load-bearing capacity of the door or window frame.

[0021] In particular, the at least one opening of a corner connector and the at least one recess of the adjacent corner connector of the corner connector arrangement form a passage for the passage of a screw. The central axis of the at least one opening of a corner connector and the central axis of the at least one recess of the adjacent corner connector can extend offset from one another through the respective welding surface in the unwelded state. By melting the welding surfaces to be joined together, the material thickness of the welding surfaces can be reduced. By thus changing the distance between the central axis of the at least one opening of a corner connector and the central axis of the at least one recess of the adjacent corner connector, an overlap of the central axis of the at least one opening of a corner connector with the central axis of the at least one recess of the adjacent corner connector can be adjusted.The passage can therefore only be formed after the respective weld surfaces have been melted and the respective center axes of the at least one opening and the at least one recess have been aligned. Through the passage, the individual hollow profiles can also be connected to the fastening device of the adjacent hollow profile using screws. This additional connection promotes high load-bearing capacity and the subsequent adjustability of the door or window frame.

[0022] A further embodiment relates to a frame construction for a door or window, comprising at least two hollow profiles arranged substantially at right angles to one another, wherein at least one corner connector and / or at least one corner connector arrangement according to the features of the description is arranged in each of the hollow profiles, wherein the hollow profiles are directly connected to one another in a materially bonded manner at the miter, and wherein the hollow profiles are additionally connected to one another in a form-fitting and force-fitting manner at the miter via the corner connectors. The frame construction can in particular be made of plastic. Frame constructions made of plastic can be manufactured from individual hollow profiles. This allows the hollow profiles to be welded to one another in a materially bonded manner at the miter.The use of corner connectors in the individual hollow profiles also promotes a particularly strong connection in the mitre area, which can further increase the load-bearing capacity and service life of the door or window frame.

[0023] In particular, at least one hollow profile has a cavity extending in the longitudinal direction of the hollow profile for receiving a stiffening profile to increase the load-bearing capacity of the frame construction and / or for receiving the shaft of the corner connector. The stiffening profile is connected to the hollow profile in a form-fitting and force-fitting manner, in particular via at least one screw extending orthogonally to the longitudinal axis of the hollow profile through the passage of the fastening device and the shaft. The stiffening profile can in particular be made of a material with a higher strength than that of the surrounding hollow profile. The stiffening profile can in particular be made of a metal alloy, particularly preferably aluminum. The stiffening profile enables door or window frames to absorb heavier loads and / or be constructed larger overall.The stiffening profile prevents the hollow profile from deforming during use. The stiffening profile can be designed, in particular, as a rectangular tube to accommodate the shaft of the corner connector. Thanks to its simple geometry, the stiffening profile can be quickly and easily inserted into the hollow profile, and the shaft into the stiffening profile. This can further increase the load-bearing capacity and service life of the door or window frame.

[0024] Preferably, at least one hollow profile has on its outer surface a flat mounting surface extending parallel to the longitudinal axis of the hollow profile for orthogonally receiving at least one screw opening, wherein the central axis of at least one screw opening extends orthogonally to the longitudinal axis of the hollow profile and intersects the central axis of the cavity running along the longitudinal axis for receiving a stiffening profile and / or for receiving the shaft of the corner connector. The mounting surface can in particular be formed as part of a groove extending along the longitudinal axis of the hollow profile. The size of the mounting surface can thus be adjusted via the width of the groove. The groove in particular has a width of at least 10 millimeters. The groove can be arranged centered on the hollow profile relative to the cavity.This allows at least one screw to be inserted centrally through the screw holes into the cavity.

[0025] In particular, the cavity has at least one inwardly projecting projection extending along the longitudinal axis of the hollow profile for spacing the stiffening profile and / or the shaft of the corner connector from the wall of the cavity. The at least one projection allows a screw locking the corner connector in the hollow profile and / or stiffening profile to protrude at least partially from the corner connector or the stiffening profile. The screw thus does not protrude from the cavity. The projection protrudes in particular at least 1 millimeter, preferably at least 3 millimeters, particularly preferably at least 5 millimeters into the cavity.

[0026] Particularly preferably, the hollow profile has at least one receiving space for receiving the screw between the cavity and the mounting surface, said receiving space extending along the longitudinal axis of the hollow profile. The at least one receiving space and the at least one projection can in particular be arranged on two opposite sides of the cavity. The at least one receiving space preferably has an outer screw opening with a first diameter and an inner screw opening with a second diameter. The first diameter can be larger than the second diameter. As a result, the screw head of at least one screw can penetrate through the outer screw opening into the receiving space and bear positively against the wall of the inner screw opening within the receiving space.

[0027] The invention will now be explained by way of example with reference to the accompanying drawings using preferred embodiments. The features presented below may represent an aspect of the invention, either individually or in combination, as long as the resulting embodiments fall within the scope of the appended claims. They show: Fig. 1 : a perspective view of a first embodiment of a corner connector, Fig. 2 : a perspective view of a first embodiment of a hollow profile with a corner connector made of Fig. 1 , Fig. 3 : a perspective view of two corner connectors for a corner connector arrangement, Fig. 4 : a perspective view of a first embodiment of a fastening device for a corner connector from Fig. 1 , Fig. 5 : a perspective view of two stiffening profiles with corner connectors made of Fig. 3 , Fig. 6 : a perspective functional view of the arrangement from Fig. 5 , Fig. 7 : a perspective view of a first embodiment of a frame construction, Fig. 8 : a perspective interior view of the frame construction from Fig. 7 ,and Fig. 9 : a perspective view of two hollow profiles with corner connectors made of Fig. 3 .

[0028] The Fig. 1 The corner connector 10 shown can be inserted into a hollow profile 12 of a door or window frame and fastened within the hollow profile 12 in a force-fitting and form-fitting manner. The corner connector 10 has a shaft 14 for inserting the corner connector 10 into the hollow profile 12. On an end face of an end section 16 of the shaft 14, a welding surface 18 is formed for materially bonding to another body. The shaft 14 has a recess 20 on its surface for the form-fitting reception of a fastening device 22. Two passages 23, which run orthogonally to the longitudinal axis of extension and are each intended for the passage of a screw 24, extend through the shaft 14 and the fastening device 22. The screws 24 can be used to lock the shaft 14 and the fastening device 22 in the hollow profile 12 in a form-fitting and force-fitting manner.The welding surface 18 and the fastening device 22 each have two openings 26 extending parallel to the longitudinal axis of the shaft 14, each for passing through a screw 24. The fastening device 22 can be connected to an adjacent hollow profile 12 in a form-fitting and force-fitting manner by means of screws 24 through the openings 26. The welding surface 18 has a recess 28 for passing through a screw 24. The hollow profile 12 can be connected to a fastening device 22 of an adjacent corner connector 10 in a form-fitting and force-fitting manner by means of a screw 24 through the recess 28. The welding surface 18 is inclined by 45 degrees to the longitudinal axis of the shaft 14 and has a structured surface with depressions 30 and elevations 32. As a result, the plastic melt can be distributed along depressions 30 when melting the elevations 32, whereby a uniform welding surface 18 can be formed.The passages 23 on the shaft 14, the openings 26 on the welding surface 18, and the recess 28 on the welding surface 18 are at least partially conical to facilitate the reception of the screws 24. The conical access facilitates the insertion of the screw. The conical accesses 33 have a half opening angle φ of less than or equal to 15 degrees.

[0029] In Fig. 2 is a hollow profile 12 with the corner connector 10 made of Fig. 1 shown. The hollow profile 12 has a miter 34 for welding to an adjacent hollow profile 12. The welding surface 18 of the corner connector 10 extends parallel to the miter 34 of the hollow profile 12. The hollow profile 12 has two screw openings 36 extending orthogonally to the longitudinal axis of the hollow profile 12. The screw openings 36 enable a positive and non-positive connection of the hollow profile 12 to the shaft 14 and the fastening device 22 by means of two screws 24.

[0030] The Fig. 3 The corner connectors 10 shown together form a corner connector arrangement 38. The corner connectors 10 are designed such that a first corner connector 10 has two openings 26 on the welding surface 18 and the fastening device 22 for the passage of screws 24. Accordingly, a second corner connector 10 has two recesses 28 on its welding surface 18 for the passage of screws 24. Together, after the welding surfaces 18 have been melted and the two corner connectors 10 have been firmly joined to one another, the two openings 26 of the first corner connector 10 and the two recesses 28 of the second corner connector 10 form two common passages 40. By means of the passages 40, the hollow profile 12 can be positively and force-fittingly connected to a fastening device 22 of an adjacent hollow profile 10. The first corner connector 10 additionally has a recess 28 on its welding surface 18 for the passage of a screw 24.Accordingly, the second corner connector 10 has an opening 26 at the welding surface 18 and the fastening device 22 for the passage of a screw 24. After the welding surfaces 18 have been melted and the two corner connectors 10 have been firmly joined, the recess 28 of the first corner connector 10 and the opening 26 of the second corner connector 10 form a common passage 40. The passage 40 allows the fastening device 22 of the hollow profile 12 to be positively and force-fittedly connected to the adjacent hollow profile 10. The screw connections can then absorb both horizontal and vertical forces.

[0031] The Fig. 4 The fastening device 22 shown has a U-shaped housing 44 made of bent sheet metal 42. By using sheet metal 42, the housing 44 can be manufactured quickly and cost-effectively. The metallic housing 44 also has a sufficiently high strength to absorb any forces that occur. The fastening device 22 has two passages 23 extending orthogonally to the longitudinal axis of the shaft 14 and two openings extending parallel to the longitudinal axis of the shaft 14 for the passage of screws 24. By means of the screws 24, the fastening device 22 can be locked within the hollow profile 12 and connected to an adjacent hollow profile 12 in a form-fitting and force-fitting manner.The fastening device 22 has a base body 46 that can be arranged in the housing 44 for receiving and positioning a first threaded holder 48 with an internal thread and a second threaded holder 50 with an internal thread for the non-positive and positive reception of a thread of a respective screw 24. The first threaded holder 48 and the second threaded holder 50 are arranged within the fastening device 22 so as to be free of movement relative to the housing 44. This allows the first threaded holder 48 and the second threaded holder 50 to align themselves with the position of the screw 24 and its insertion angle. In this way, the engagement of the internal thread of the first threaded holder 48 and the second threaded holder 50 with the thread of the respective screw 24 is facilitated. The base body 46 each has a recess 52 for receiving the first threaded holder 48 and the second threaded holder 50.This allows the first threaded holder 48 and the second threaded holder 50 to be arranged captively in the fastening device 22. The first threaded holder 48 and the second threaded holder 50 can each be arranged so as to be movable by at least 0.5 millimeters within the fastening device 22. This allows the first threaded holder 48 and the second threaded holder 50 to align themselves with the thread of the respective screw 24, thus simplifying the insertion of the screw 24. The first threaded holder 48 and the second threaded holder 50 are cuboid-shaped. As a result, the first threaded holder 48 and the second threaded holder 50 always assume a basic position on one of their side surfaces in the fastening device 22 due to their own weight. The base body 46 can be pushed into the housing 44 and positively connected to the housing 44 by clipping.This allows for simple and cost-effective assembly of the fastening device 22. The base body 46 can be made of plastic, which makes it easy and cost-effective to manufacture by injection molding.

[0032] The Fig. 5 The two corner connectors 10 are made of the stiffening profiles 54 shown Fig. 3 The two stiffening profiles 54 are positively and non-positively connected to one another via the corner connectors 10 at their miter 34. The corner connectors 10 are materially connected to one another via the welding surfaces 18. The corner connectors are each fastened within the stiffening profile 54 at their shaft 14 and their fastening device 22 via two screws 24 that extend through the stiffening profile 54, in a non-positively and non-positively manner. The stiffening profiles 54, arranged at right angles to one another, are additionally non-positively and non-positively connected to the fastening device 22 of the adjacent stiffening profile 54 by means of screws 24 that extend through the welding surfaces 18. The stiffening profiles 54 can be arranged within the hollow profiles 12 to increase the load-bearing capacity of the hollow profiles 12.

[0033] The Fig. 6 shown functional view of the arrangement from Fig. 5 shows a detailed functional relationship between the stiffening profiles 54, the screws 24, the housings 44, with the first threaded holders 48 and the second threaded holders 50. The remaining components have not been shown for the sake of clarity.

[0034] The Fig. 7 The perspective view of a first embodiment of a frame construction 56 shown shows four individual hollow profiles 12, which are welded at their miters 34 to form a door or window frame and fastened to one another by means of screws 24. Corner connectors 10 are installed inside the individual hollow profiles 12, whereby additional screws 24 can be inserted from the outside to increase the strength and service life of the door or window frame.

[0035] The Fig. 8 shown interior view of the frame construction 56 from Fig. 7 shows four stiffening profiles 54 that can be inserted into the hollow profiles 12 and eight corner connectors 10 inserted into the stiffening profiles 54 at the miters 34. By melting the welding surfaces 18, the hollow profiles 12 can be firmly bonded to one another. The passages 40 formed by the welding process on the welding surfaces 18 enable the additional positive and non-positive connection of the hollow profiles 12 and the stiffening profiles 54 to one another by means of screws 24.

[0036] The Fig. 9 The hollow profiles 12 shown show the mounting surfaces 58 extending parallel to the longitudinal axes of the hollow profiles 12. The mounting surfaces 58 each have at least one screw opening 36 and at least one recess 28 for passing screws 24 through the respective corner connector 10. The respective cavities 60 of the hollow profiles 20 have at least one projection 62 projecting inwards and extending along the longitudinal axis of the hollow profiles 12 for spacing the respective stiffening profile 54 and / or the shaft 14 of the respective corner connector 10 from the wall of the cavity 60. Due to the at least one projection 62, a screw 24 locking the corner connector 10 in the hollow profile 12 can protrude at least partially from the corner connector 10 or the stiffening profile 58. The screw 24 therefore does not protrude from the cavity 60.The hollow profiles 12 have, between the cavities 60 and the mounting surfaces 58, at least one receiving space 64 extending along the longitudinal axis of the hollow profile 12 for receiving at least one screw 24. The at least one receiving space 64 and the at least one projection 62 are arranged on two opposite sides of the cavity 60. The at least one receiving space 64 has an outer screw opening 66 with a first diameter and an inner screw opening 68 with a second diameter. The first diameter is larger than the second diameter. As a result, the screw head of the screw 24 can penetrate through the outer screw opening 66 into the receiving space 64 and form-fit against the wall of the inner screw opening 68 within the receiving space 68. Bezugszeichenliste

[0037] 10Corner connector 12Hollow profile 14Shaft 16End section 18Weld surface 20Recess 22Fastening device 23Passage 24Screw 26Opening 28Recess 30Counterbore 32Elevation 33Access 34Miter 36Screw opening 38Corner connector assembly 40Passage 42Sheet 44Housing 46Base body 48First threaded retainer 50Second threaded retainer 52Recess 54Stiffening profile 56Frame structure 58Mounting surface 60Cavity 62Protrusion 64Receiving space 66Outer screw opening 68Inner screw opening

Claims

1. A corner connector for a hollow profile (12) of a door or window frame, having a shaft (14) for insertion into the hollow profile (12) along an axis of longitudinal extent of the shaft (14), a welding surface (18) formed on an end face of an end portion (16) of the shaft (14) and extending at least partially parallel to a mitre (34) of the hollow profile (12) for the purpose of a material-locking connection with another body, a fastening device (22) for locking the shaft (14) within the hollow profile (12), wherein the shaft (14) has a recess (20) on its surface for receiving the fastening device (22), characterised in that the fastening device (22) and the shaft (14) each have at least one passage (23) extending orthogonally to the longitudinal extension axis of the shaft (14) for the passage of a screw (24) extending orthogonally to the longitudinal extension axis of the shaft (14) through the hollow profile (12) for non-positively and positively fastening the fastening device (22) and the shaft (14) within the hollow profile (12).

2. A corner connector according to claim 1, wherein the fastening device (22) has at least one first threaded holder (48) with an internal thread for non-positively and positively receiving a thread of the screw (24) extending orthogonally to the longitudinal extension axis of the shaft (14) through the hollow profile (12), wherein in particular the at least one first threaded mount (48) is arranged within the fastening device (22) such that it is fixed against movement relative to the passage (23) of the fastening device (22), which passage extends orthogonally to the longitudinal extension axis of the shaft (14).

3. A corner connector according to claim 1 or 2, wherein the fastening device (22) is arranged in the recess (20) so as to be displaceable relative to the shaft (14).

4. A corner connector according to one of the claims 1 to 3, wherein the fastening device (22) and the welding surface (18) each have at least one opening (26) extending parallel to the longitudinal axis of the shaft (14) for the passage of a screw (24) extending parallel to the longitudinal axis of the shaft (14).

5. A corner connector according to one of the claims 1 to 4, wherein the fastening device (22) comprises at least one second threaded holder (50) with an internal thread for non-positively and positively receiving a thread of the screw (24) extending parallel to the longitudinal extension axis of the shaft (14), wherein in particular the at least one second threaded holder (50) is arranged within the fastening device (22) such that it is fixed against movement relative to the opening (26) of the fastening device (22) extending parallel to the longitudinal axis of the shaft (14).

6. A corner connector according to one of the claims 1 to 5, wherein the welding surface (18) has at least one recess (28) extending orthogonally to the longitudinal extension axis of the shaft (14) for the passage of a screw (24) extending orthogonally to the longitudinal extension axis of the shaft (14) through the hollow profile (12).

7. A corner connector according to one of claims 1 to 6, wherein the at least one passage (23) on the shaft (14), the at least one opening (26) on the welding surface (18) and / or the at least one recess (28) on the welding surface (18) is / are conical for receiving a respective screw (24).

8. A corner connector according to one of the claims 1 to 7, wherein the fastening device (22) has a base body (46) for receiving and positioning at least one / the first threaded holder (48) with an internal thread and / or at least one / the second threaded holder (50) with an internal thread inside a housing (44).

9. A corner connector according to a combination of claims 5 and 6, wherein the at least one opening (26) and the at least one recess (28) each have a centre axis, wherein the centre axis of the at least one opening (26) and the centre axis of the at least one recess (28) extend substantially orthogonally and offset to one another through the welding surface (18).

10. A corner connector arrangement for a door or window frame comprising two corner connectors (10) according to one of claims 1 to 9, wherein the two corner connectors (10) are connected to each other in a materially integral manner via their respective welding surfaces (18).

11. A corner connector arrangement according to claim 10, wherein the at least one opening (26) of one corner connector and the at least one recess (28) of the adjacent corner connector (10) form a passage (40) for passing a screw (24).

12. A frame construction for a door or window, comprising at least two hollow profiles (12) arranged essentially at right angles to one another, wherein at least one corner connector (10) according to one of claims 1 to 9 and / or at least one corner connector arrangement (38) according to one of claims 10 or 11 is arranged in each of the hollow profiles (12), wherein the hollow profiles (12) are directly connected to one another in a materially integral manner at the mitre (34), and wherein the hollow profiles (12) are additionally connected to one another in a positive and non-positive manner at the mitre (34) via the corner connectors (10).

13. A frame construction according to claim 12, wherein at least one hollow profile (12) has a cavity (60) extending along the longitudinal extension axis of the hollow profile (12) for receiving a stiffening profile (54) for increasing the load-bearing capacity of the frame construction (56) and / or for receiving the shaft (14) of the corner connector (10).

14. A frame construction according to claim 13, wherein at least one hollow profile (12) has on its outer surface a flat mounting surface (58) extending parallel to the longitudinal axis of the hollow profile (12) for orthogonally receiving at least one screw opening (36), wherein the centre axis of at least one screw opening (36) extends orthogonally to the longitudinal extension axis of the hollow profile (12) and intersects the centre axis of the cavity (60) running along the longitudinal extension axis.

15. A frame construction according to claim 13 or 14, wherein the cavity (60) has at least one inwardly projecting protrusion (62) extending along the longitudinal axis of the hollow profile (12) for spacing the stiffening profile (54) and / or the shaft (14) of the corner connector (10) from the wall of the cavity (60).

Images