Corner connectors for joining at least two profile strips of a frame system

Abstract

Corner connectors (10) for connecting at least two profile strips (6, 8) of a frame system (4), comprising - two perpendicularly extending leg sections (42) and a corner section (44) arranged between them, - wherein a guide groove (90) extending along a leg longitudinal direction (L) is provided on the rear side of at least one leg leg (42) for at least partial guidance of a spring element (98), - wherein the guide channel (90) opens into a rearwardly open recess (92) of the corner part (44), and - wherein the foot leg (42) has a recess (96) on its front side to receive a spring end (108) of the spring element (98).

Description

[0001] The invention relates to a corner connector for joining at least two profile strips of a frame system. The invention further relates to a frame system with such a corner connector and to a protective system, in particular a protective window or a protective door.

[0002] To protect openings in building structures, such as windows or doors (balcony or patio doors), insect, particle, or pollen protection systems that can be mounted as frame systems are used, which in turn should cover the opening as completely as possible. The greatest possible flexibility in adapting to different opening sizes is desirable.

[0003] Furthermore, a straightforward frame assembly and easy insertion of the particle protection grille or mesh fabric into the system frame are desirable. Secure mounting of the system frame, covered with the mesh fabric (mesh or cloth), at its intended location, particularly on a door or window, should also be ensured. In addition, the overall system should be as flexible as possible to allow for adaptation to varying on-site installation conditions.

[0004] Insect or pollen protection systems of this type are usually provided as a modular assembly kit for individual adaptation to different window or door dimensions, so that the system can be flexibly adapted to practically all common building openings.

[0005] A typical mounting kit of this type comprises several profile strips that can be cut to length and an oversized mesh or protective fabric. The profile strips are mounted to the right-angled system frame using profile or corner connectors. A receiving chamber (keder groove) open towards the window or door frame accommodates a keder strip, which is used to attach and secure the mesh to the system frame. The mesh covers the frame opening of the system frame, thus protecting the window or door opening from penetrating foreign objects and allowing air to pass through.

[0006] Such a frame system for pivot-movable attachment to a door frame is known, for example, from DE 20 2021 101 588 U1 and from DE 20 2014 005 807 U1.

[0007] The rotational mobility of such a protective door is achieved by means of hinge arrangements that can be mounted on the corner connector, whereby permanent magnets are provided on the side facing the building opening, for example, to hold the frame system in a closed position, which come into contact with a metal plate or a counter magnet attached to the building or the door frame.

[0008] DE 20 2023 107 630 U1 further discloses the use of a torsion spring for clamping a frame system mounted as an insect screen window to a rebate frame of a building opening (window opening).

[0009] The invention is based on the objective of providing a particularly suitable corner connector for joining profile strips of a frame system. In particular, a corner connector is to be provided which, as a single component, is suitable for both the assembly of a frame system mounted as a protective door and for the assembly of a frame system mounted as a protective window. The invention is further based on the objective of providing a particularly suitable frame system and a particularly suitable protective system.

[0010] This problem is solved according to the invention with respect to the corner connector with the features of claim 1, the frame system with the features of claim 6, and the protective system with the features of claim 11. Advantageous embodiments, variants, and further developments are the subject of the dependent claims.

[0011] The advantages and features mentioned with regard to the corner connector can also be applied analogously to the frame system and / or the protection system, and vice versa.

[0012] The conjunction “and / or” is to be understood here and in the following as meaning that the features linked by means of this conjunction can be both common and alternative to each other.

[0013] The corner connector according to the invention is designed and configured for connecting at least two profile strips of a frame system. In particular, the corner connector is designed for plug-in connection of two profile strips in a frame corner of the frame system. However, the following descriptions can also be applied analogously to other corner or profile connectors, for example, for joining three profile strips at a cross member of a frame system mounted as a safety gate.

[0014] The corner connector has two perpendicular connecting legs and a corner piece positioned between them. The connecting legs are designed and positioned to be inserted into corresponding joining chambers of the profile strips, with the corner piece acting, for example, as a stop or guide for the end faces of the profile strips.

[0015] The corner connector has a front and a back. Here and in the following, "front" refers specifically to the surface of the corner connector that faces the front of the frame system during installation. Similarly, "back" refers specifically to the surface of the corner connector opposite the front, which faces the back of the frame system during installation. When the frame system is installed on a building opening, the front is preferably oriented towards the outside, while the back faces the interior of the building.

[0016] At least one of the footlegs has a guide groove extending along a longitudinal direction of the leg. A longitudinal direction of the leg, in this context, refers specifically to a direction running along the longitudinal extent of the footleg.

[0017] The guide groove is designed as an elongated, particularly straight, recess in the spring leg. The guide groove is designed, for example, as a bead or indentation and extends essentially over the entire length of the spring leg. The guide groove is located on the rear side, i.e., in the back of the spring leg. The guide groove is designed and configured to guide a spring element, in particular a spring leg of the spring element, at least partially and / or to hold it at least in the transverse direction of the leg. A transverse direction of the leg is understood here to mean, in particular, a direction perpendicular to the longitudinal direction of the leg.

[0018] The guide channel terminates in a recess in the corner piece that is open at the rear. In the assembled state, the guide leg is joined to the corresponding profile strip in such a way that the guide leg is essentially completely inserted into a fully enclosed joining chamber in the profile strip. The spring element, which is guided within the channel, is thus positively locked between the guide channel and a chamber wall of the joining chamber in the assembled state. A spring element can protrude section by section through the recess in the corner piece, which rests against the end face of the profile strip. This allows the spring element to be used, for example, as a return element in a frame system mounted as a door and / or as a clamping spring for the non-destructive clamping of a frame system to a rebate frame of the building opening.

[0019] The term "positive locking" or "positive locking connection" between at least two interconnected parts is understood here and in the following to mean, in particular, that the cohesion of the interconnected parts in at least one direction is achieved either through a direct interlocking of the contours of the parts themselves or through an indirect interlocking via an additional connecting element. The "blocking" of mutual movement in this direction is thus due to the form.

[0020] The joining leg also features a front-facing recess to accommodate one end of the spring element. This recess, designed, for example, as a notch, is located on the side of the joining leg opposite the guide groove, allowing a spring element to be guided from the guide groove to the recess via a bend. In the assembled state, the recess is overlapped by a chamber wall of the joining chamber, thus positively locking the spring end within the recess. This ensures that when a spring leg emerging from the recess is compressed, sufficient counter-force or holding force is generated by the recess and / or the chamber wall or the profile strip. Consequently, a spring element with a higher spring rate can be used, enabling, for example, a more stable clamping connection.

[0021] This results in a particularly suitable corner connector. Especially in combination with a spring element, a secure and stable mounting of the spring element in a frame corner area of ​​a frame system can be achieved. However, the corner connector can also be used without a spring element.

[0022] In one possible embodiment, the recess of the corner piece has a bulge arranged or oriented transversely to the longitudinal direction of the leg, i.e., along the transverse direction of the leg, serving as a support surface for the spring element. If a spring element is mounted as a return element or clamping spring with the corner connector in a frame corner, the spring section extending from the recess preferably runs substantially along the transverse direction of the leg. The bulge ensures that there is no sharp edge in the exit area that could lead to undesirable deformation of the spring element.

[0023] In a further development, the corner piece has a first receiving chamber, accessible via a longitudinal slot on the rear, for a retaining element for attaching a mesh fabric to the frame, and / or a second receiving chamber, accessible via a longitudinal slot on the rear of the frame, for a sealing element. The receiving chambers are designed as extensions of corresponding receiving chambers in the profile strip, allowing a retaining element and / or a sealing element to be installed right up to the frame corner area. This enables a substantially continuous, fully enclosed mounting of a protective mesh to the frame system and / or a substantially continuous seal.

[0024] The retaining element, for example, which is a keder-like component, is in particular a flexible or rubber-elastic keder strip. Alternatively, the retaining element is designed, for example, as a keder cord, which is inserted into the receiving chamber using a keder tool. The sealing element is designed, for example, as a sealing brush.

[0025] For example, the corner connector has two frame-internal (first) receiving chambers on the back of the frame, oriented perpendicular to each other and extending over the inner corner area, and two frame-external (second) receiving chambers oriented perpendicular to each other and extending over the outer corner area, which, in the assembly state, lead seamlessly into corresponding receiving chambers of the joined profile strips.

[0026] An additional aspect of the invention provides that at least one of the corner legs has a groove extending longitudinally along the front side, i.e., on the side of the recess, for receiving a joining contour of a functional element. The groove runs on the outside, with the recess being offset inwards. The groove extends at least partially into the corner section. The groove extends sufficiently far into the corner section that the functional element can be mounted essentially entirely within the area of ​​the corner section, and thus without collision outside the profile strips. For assembly, the functional element is inserted via the groove of the corner leg and moved towards the corner section.

[0027] This is particularly advantageous for the design of the corner connector in a frame system that can be mounted as a protective door, as it allows, for example, the mounting of a functional element designed as a hinge in the area of ​​the corner connector.

[0028] Preferably, the joining contour and / or the joining groove is shaped in cross-section in the manner of an arrowhead, i.e. wedge-shaped, so that a stable and reliable positive locking fastening can be achieved.

[0029] In a corner connector for a frame system that can be mounted as a protective window, such a joint groove can be omitted. Preferably, the corner connectors for a protective window and a protective door can thus be manufactured as identical parts, differing only in the joint groove. The corner connectors are preferably manufactured as injection-molded parts, with the joint groove being produced in particular by a slide. The corner connectors for a protective window and for a protective door can therefore be produced in the same injection mold, with the slide additionally being used for demolding the protective door corner connectors.

[0030] The frame system is designed as a kit. To allow for maximum assembly flexibility, the corner connectors preferably have two grooves, one for each leg. This allows a corner connector to be mounted, for example, as the left or right upper corner of a safety gate frame system. A functional element can then be installed in either groove. A wedge is conveniently provided, which can be inserted into the groove of the corner connector not intended for the functional element. The wedge covers at least part of the groove, particularly in the corner section, resulting in a visually appealing surface on the front of the frame system.

[0031] The frame system according to the invention is intended for, and suitable and configured for, a protective system, in particular for a protective window or a protective door. The frame system comprises a system frame (support frame, tension frame, mounting frame, cover frame) composed of profile strips, wherein at least two profile strips are connected or connectable to a frame corner by means of a corner connector described above.

[0032] The profile strips are designed, for example, as hollow profiles open at the ends (hollow profile strips), and are mounted to the system frame as two longitudinal profiles extending in the vertical direction (vertical profile) and two transverse profiles extending in the horizontal direction (horizontal profile), depending on their installation situation.

[0033] If the frame system is designed as a safety door, the bottom-side cross profile can be configured as a floor or base profile. Such a floor profile can be designed as a tread or kick plate. Furthermore, another cross profile can be arranged as a cross brace at approximately half the height of the door system frame for mechanical stabilization and stiffening of the system frame.

[0034] The hollow profile strips are, for example, cuttable metal profiles, particularly made of aluminum. Their basic cross-section is preferably essentially rectangular, although square versions are also conceivable. However, rectangular cross-sectional shapes are preferred to achieve improved stiffness and a reduced installation depth.

[0035] The front of the profile strips is essentially smooth, resulting in a visually appealing frame system. The front can also, for example, have a convex curve towards the outer edge of the frame, thus enabling a visually pleasing transition to a surrounding building wall.

[0036] The system frame is designed and configured to accommodate a protective grille, i.e., a mesh or protective fabric. For this purpose, for example, keder elements or keder strips are provided, which are inserted (pressed into) corresponding keder grooves (receiving chambers) of the profile strips to fix the fabric to the frame.

[0037] The protective screen is preferably insect- and / or particle- and / or pollen-proof. The screen fabric is, for example, a particle-proof screen, such as a pollen- and / or dust- and / or soot-proof screen and / or insect screen, or a sun-protection screen, such as a sun-protection screen for reducing heat and sunlight. Preferably, the screen fabric is a combined pollen, dust, soot, and insect screen or a combined sun-protection and insect screen.

[0038] In a possible further development, the frame system is designed as a safety gate. For pivoting mobility, at least one (door) hinge is provided as a functional element, enabling the system frame to pivot relative to the building or door opening. This functional element is connected to, or can be connected to, the corner connector.

[0039] The hinge comprises a first hinge strip with a joining contour for the corner connector's joining groove, and a second hinge strip rotatably or pivotally coupled to the first hinge strip via a hinge pin. The second hinge strip preferably has a mounting contour or mounting holes for fasteners, particularly for screw fixing, in the area of ​​the building opening. The joining contour allows the first hinge strip to be pre-mounted on the frame system or the corner connector, while the second hinge strip can be attached separately to the building opening. For final assembly, the hinge strips are joined together by the hinge pin and rotatably coupled. This ensures particularly easy assembly of the frame system.

[0040] The hinge pin has a pin shaft that connects the hinge straps and a pin head that widens radially to provide axial support. In a preferred embodiment, the hinge pin or pin shaft has a circumferential annular groove at its free end, into which an elastic retaining ring can be inserted or inserted for axially positive locking of the hinge pin to the hinge straps. The retaining ring widens the pin shaft radially, thus creating an axial support opposite the pin head. This makes it possible, for example, to mount the hinge pin from below, i.e., to orient the pin head towards the substrate, with the retaining ring preventing the hinge pin from sliding out of the hinge straps. This provides additional flexibility in the assembly of the frame system.

[0041] In a preferred embodiment, a torsion bar spring is provided as a spring element of the frame system. The torsion bar spring is, for example, designed as a mounting clamp by means of which the frame system, which is designed in particular as a protective window, can be clamped to a rebate frame of the building opening.

[0042] The torsion spring has a first spring leg and a second spring leg running parallel to it, which, in the assembled state, are located within the joining chamber of the profile strip. In the assembled state, the first spring leg is guided, at least partially, in the guide groove of the corner connector and emerges from the corner connector with one end through the recess. The second spring leg is guided within a joining chamber to the recess of the joining leg.

[0043] The spring legs are connected at their respective first leg ends via a loop- or sling-shaped connection point, with a second spring end of the second spring leg being secured in the recess of the corner connector. This recess provides sufficient support for the spring end between the spring leg and the wall of the joining chamber, preventing twisting of the second spring leg in the event of a bending movement of the spring end extending from the corner part and the associated twisting of the first spring leg associated with that spring end.

[0044] The spring end protruding from the corner section extends, at least partially, transversely to the longitudinal direction of the spring leg when assembled. By means of torsion springs preferably provided in at least two frame corners, the frame system can be clamped into an opening frame (window or door frame) of a building opening, for example a rebate frame, in a non-destructive and, in particular, drill-free manner.

[0045] The first spring end preferably has a retaining lug on its free end for gripping behind an opening or folding frame, wherein the retaining lug is bent or offset relative to the second spring end. In particular, the retaining lug is bent / offset towards the system frame. In other words, the retaining lug has a slight offset so that the first spring end points away from the opening frame when assembled. This makes the first spring end easier for a user to grip. Thus, a gripping bend (gripping offset, gripping aid) is implemented for easy grasping of the first spring end, thereby simplifying assembly and / or disassembly.

[0046] The torsion bar spring is preferably in particular a spring wire bent in such a way as to form the two spring legs and the two spring ends, such that the two spring legs run parallel to each other with as little distance as possible.

[0047] In one conceivable embodiment, the first spring leg has a supporting bend which is supported on the curvature of the recess.

[0048] The protective system according to the invention is designed in particular as a protective window, preferably as an insect screen window, or as a protective door, preferably as an insect screen door. The protective system comprises a frame system as described above and a mesh fabric that can be inserted or stretched therein. This results in a particularly suitable protective system. The protective system is designed in particular according to a modular principle, wherein, for example, the profile strips of the frame system can be cut to length and the protective mesh is manufactured with excess material.

[0049] Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. The drawing shows: Fig. 1. Front view of a protective door with a frame system with vertical and horizontal profile strips and corner connectors connecting them, Fig. 2 In front view, a section of an upper frame corner of the frame system with a corner connector and a hinge as a functional element, Fig. 3 in perspective exploded view the frame corner in a partially disassembled state, Fig. 4. In perspective view, a front view of the corner connector, Fig. 5 in perspective view a back side of the corner connector, Fig. 6 in section view a profile strip, Fig. 7 in perspective view the hinge in a disassembled state, Fig. 8 in top view a hinge band of the hinge, Fig. 9 in perspective view the hinge band, Fig. 10 in front view a protective window with the frame system, Fig. 11 in rear view a partial view of an upper frame corner of the frame system with a corner connector and with a torsion bar spring as a spring element, Fig. 12 in perspective exploded view the frame corner in a partially disassembled state, Fig. 13 in perspective view the frame corner in a partially assembled state, Fig. 14 in perspective view of the corner connector and the torsion bar spring looking at a rear view, and Fig. 15 in perspective view of the corner connector and the torsion bar spring looking at a front.

[0050] Corresponding parts and sizes are marked with the same reference symbols in all figures.

[0051] The Fig. Figure 1 shows a front view of a protective system 2 designed as a particle or insect screen door. The protective system 2 has a frame system 4 made of vertical profile strips 6, hereinafter also referred to as longitudinal profiles, and horizontal profile strips 8, hereinafter also referred to as transverse profiles. The profile strips 6, 8 are connected to each other at frame corners by means of corner connectors 10 to form a system frame 12. Protective grilles 14 are clamped in the system frame 12 and are attached to the profile strips 6, 8 by means of retaining elements 15 (not shown in detail). Fig. 3) are attached.

[0052] The cross-profile on the ground or subsurface is designed as a ground or subsurface profile 16. In a lower corner area, a two-part diagonal brace 18 is mounted between a longitudinal profile 6 and the ground profile 16, which can be used to set a right angle between the ground profile 16 and the longitudinal profile 6, and which improves the torsional, tilting or twisting stiffness of the frame system 4.

[0053] A cross profile is arranged as a cross strut 20 at approximately half the height of the system frame 12 for mechanical stabilization and stiffening of the frame system 4.

[0054] To connect the cross member 20 to the longitudinal profiles 6, a profile connector 22 is provided on each side. A door handle 24 is arranged on one of the profile connectors 22, while a hinge 26 with a return mechanism 28 is arranged on the opposite profile connector 22.

[0055] The frame system 4 has three hinges 26, one in the upper frame corner area, one at the level of the crossbar 20, and one in the lower frame corner area.

[0056] The following is based on the Fig. 2 to Fig. 9 in particular the construction of the upper hinge-side frame corner is explained in more detail.

[0057] The in Fig. The profile strips 6, 8 shown in the sectional view are designed as hollow profiles and each has a joining chamber 30 and two receiving chambers 32, 34, which are open at the end faces of the profile strips 6, 8. In the illustrated embodiment, the profile strips 6, 8 are essentially identical parts. The front face of the profile strips 6, 8 has a convex bend or curvature towards the outside of the frame.

[0058] The approximately square-sectioned receiving chamber 32 is located on the inside of the frame and is opened via a longitudinal profile slot 36 on the rear of the frame. The longitudinal profile slot 36 is formed in a recessed or offset surface of the back of the profile strip. A retaining element 15, designed as a keder strip, is pressed into the receiving chamber 32, by means of which the protective grille 14 is fixed to the system frame 12. Due to the offset, the back of the retaining element 15 is flush with the rest of the profile back when installed.

[0059] In addition to the receiving chamber 32, the joining chamber 30 is arranged, extending from the receiving chamber 32 essentially over the remaining width of the profile strip 6, 8. On the outer side of the frame, offset towards the rear, the approximately rectangular receiving chamber 34 is arranged. The receiving chamber 34 is thus partially positioned above the joining chamber 30. The receiving chamber 34 is opened via a longitudinal slot 38 in the profile on the rear of the frame and serves to receive the sealing element 40, in particular in the form of a sealing brush.

[0060] The corner connector 10 of the frame corner has two mutually perpendicularly arranged joining legs 42, each of which can be positively inserted into the end-face opening of the joining chambers 30 of the profile strips 6 and 8. The joining legs 42 extend along a respective leg longitudinal direction L, which, in the assembled state, is oriented along the longitudinal direction of the profile strips.

[0061] The shanks 42 of the corner connectors 10 in the upper frame corners are preferably identical, since the profile strips 6, 8, and in particular their joining chambers 30, are essentially the same. The corner connectors 10 in the lower frame corners, for example, have two different shanks 42, since the bottom profile 16 is wider than the cross profile 8.

[0062] The joining legs 42 have a certain overlap or spread along a leg transverse direction Q oriented perpendicular to the leg longitudinal direction L with respect to the corresponding joining chamber 30, so that the joining legs 42 are inserted into the joining chambers 30 with a clamping force in the assembly or joining state. An approximately square corner part 44 is provided between the joining legs 42.

[0063] For example, in the Fig. As can be seen in Figure 2, the joining legs 42 are, in the assembled state, essentially completely recessed in the joining chambers 30 of the profile strips 6, 8, with the profile strips 6, 8 abutting the corner piece 44 at their ends. The front of the corner piece 44 is designed as a cover area with two cover collars 46 projecting upwards towards the profile strips 6, 8. In the assembled state, the cover collars 46 overlap at least partially the end faces of the profile strips 6, 8, so that the cut or trimmed edges of the profile strips 6, 8 are attractively concealed.

[0064] The corner piece 44 has two mutually perpendicular receiving chambers 48 on its rear side, extending across the inner corner area and located within the frame. These receiving chambers 48 correspond to the receiving chambers 32 of the profile strips 6 and 8, so that, in the assembled state, the receiving chambers 32 transition almost seamlessly into the receiving chambers 48. Each receiving chamber 48 is opened on its rear side by a longitudinal slot 50 oriented parallel to the respective leg's longitudinal direction L, which, in the assembled state, opens into the longitudinal slot 36 of the profile.

[0065] The corner section 44 has two mutually perpendicular receiving chambers 52 on its rear side, extending across the inner corner area and located on the outer side of the frame. These receiving chambers 52 correspond to the receiving chambers 34 of the profile strips 6 and 8, so that, in the assembled state, the receiving chambers 34 transition almost seamlessly into the receiving chambers 52. Each receiving chamber 52 is opened on its rear side by a longitudinal slot 54 oriented parallel to the respective leg's longitudinal direction L, which, in the assembled state, opens into the longitudinal slot 38 of the profile. In the outer corner area of ​​the frame, the receiving chambers 52 open into an approximately square recess 56, through which the sealing elements 40 can be inserted into the channels formed by the receiving chambers 34 and 52.

[0066] At the in Fig. In the front side shown in Figure 4, a joining groove 58 extending in the longitudinal direction L of the leg is provided in the joint legs 42, which extends at least partially into the corner part 44. The joining groove 58, which is approximately wedge- or arrowhead-shaped in cross-section, serves for the positive locking fastening of a functional element, in particular the hinge 26.

[0067] The frame system 4 has a number of joining wedges 60 which can be inserted into the joining groove 58 of the corner connector 10, which is not intended for the hinge 26. The joining wedge 60 has a joining contour 62 shaped complementarily to the joining groove 58, by means of which the joining wedge 60 is positively locked in the joining groove 58.

[0068] The joining wedge 60 covers the joining groove 58, particularly in the area of ​​the corner part 44, at least partially, so that an aesthetically pleasing surface of the corner connector 10 is achieved on the front of the frame system ( Fig. 2) In the assembled state, the hinge 26 of the hinge-side corner connector 10 is preferably inserted in the joining groove 58 oriented along the longitudinal profile 6, wherein the joining groove 58 oriented along the transverse profile 8 is fitted with the joining wedge 60. In the case of the non-hinge-side corner connector 10, for example, both joining grooves 58 are equipped with the joining wedges 60.

[0069] The following is based on the Fig. The hinge 26, which is explained in more detail in sections 7 to 9, has a first hinge band 64 joined or joinable to the corner connector 10 and a second hinge band 68 coupled to it via a hinge pin 66 in a way that allows it to rotate or pivot.

[0070] The hinge pin 66 has a pin shank 70 and a pin head 72. The pin shank 70 is provided at a free end opposite the pin head 72 with an annular groove 74 in which a retaining ring 76 is arranged as a locking element. The retaining ring 76 is, for example, designed as a rubber or snap ring.

[0071] The hinge 68 has fastening openings 78 for screw fastening of the hinge 68 in the area of ​​a building opening, for example on a door frame there or in or on a door or wall reveal. The hinge 68 further has two axially aligned through-holes 80 for receiving the hinge pin 66, wherein a corresponding through-hole 82 of the hinge 68 can be arranged between the through-holes 80, so that the through-holes 80, 82 are jointly penetrated by the hinge pin 66 in the installed state.

[0072] The hinge band 64 has a joining contour 84 corresponding to the joining contour 62 in order to fix the hinge band 64 to the corner connector 10 by means of the joining groove 58.

[0073] The following is based on the Fig. A second embodiment of the protection system 2 is explained in more detail in sections 10 to 15. In this embodiment, the protection system 2 is designed as an insect screen window.

[0074] In this embodiment, the frame system 4 has two longitudinal profiles 6 and two transverse profiles 8, which are joined to form a rectangular system frame 12 by means of four identical corner connectors 10. A handle 86 with a retaining cord 88 is attached to the upper transverse profile 8 for simplified assembly or disassembly on a window frame.

[0075] In this embodiment, the corner connectors 10, for example, do not have front-side joint grooves 58, since no hinges 26 are to be mounted on the corner connector 10 as functional elements in the protective system 2 in this embodiment. Preferably, the corner connectors 10 are for the in Fig. 10 protective windows shown and the corner connectors 10 for the in Fig. The protective door shown in Figure 1 can be manufactured as identical parts, differing only in the joining groove 58. The corner connectors 10 are preferably injection-molded, with the joining groove 58 being produced in particular by a slide. The corner connectors 10 for the protective window and for the protective door are thus produced in the same injection mold, with the slide also being used for demolding the protective door corner connectors. Alternatively, the corner connector 10 can also be provided with joining grooves 58 for the protective window, with a joining wedge 60 preferably being inserted into each of the joining grooves 58.

[0076] The leg sections 42 of the corner connectors 10 each have a guide groove 90 extending along the longitudinal direction L of the leg. The guide groove 90, which may be designed, for example, as a bead or embossing, has a semicircular or U-shaped cross-sectional form. The guide groove 90 is located on the rear side of the leg sections 42 and extends to a respective recess 92 of the corner part 44. The recess 92 is open at the rear and has a curvature 94 or bend oriented towards the inside of the frame in the transverse direction Q of the leg, forming a chamfer or rounding of the opening edge of the recess 92.

[0077] On the front side of the joining leg 42, an approximately square recess 96 is formed in the joining leg 42, which is open on the end face, front face, and (frame) inner side. The recess 96 is thus offset inwards relative to the joining groove 58 in the joining leg 42. The recess 96 is, for example, designed as a notch in the joining leg 42.

[0078] For simple and non-destructive attachment of the protective system 2 to the building or window opening, four spring elements 98 are provided as functional elements in the frame corner areas or corner connectors 10.

[0079] The spring element 98 is designed as a spring clamp, in particular as a torsion bar spring, and is hereinafter also referred to as such. The torsion bar spring 98 is made of bent spring wire and is designed in particular as a leg spring. The torsion bar spring 98 has, in particular, two spring legs 100, 102 and a connecting section 104 arranged between them, which integrally connects the leg ends 100, 102. The spring legs 100, 102 run substantially parallel to each other, with the approximately loop- or U-shaped connecting section 104 forming a 180° bend in the spring wire.

[0080] The leg ends of the spring legs 100, 102 facing away from the connecting section 104 are each designed as spring ends 106, 108 that are approximately L-shaped.

[0081] In the assembled state of the torsion bar spring 98, the spring end (fixed end, counter bearing) 108 is arranged in the recess 96 ( Fig. 15) The spring leg 100 is arranged via the spring arm 102 and the connecting section 104 such that it is seated, at least partially, in the guide groove 90. The torsion bar spring 98 is arranged within the joining chamber 30 of the respective longitudinal profile 6, with the torsion bar spring 98 projecting out of the corner connector 10 via the recess 92 by means of the spring end 106 of the spring leg 100. The spring end 108 is thus positively engaged in the recess 96 and the chamber walls of the joining chamber 30, with the spring leg 100 being positively engaged by the guide groove 90 and the chamber wall of the joining chamber 30 that overlaps it.

[0082] The L-shaped spring end (clamping leg) 106 has a retaining lug 110 at its free end, the retaining lug 110 being formed essentially by the short leg of the L. In this embodiment, the free end of the retaining lug 110 is coated with a protective coating (protective paint, protective lacquer) to prevent damage, especially scratches, to the frame rebate edge as much as possible. Alternatively, an elastic protective or rubber sleeve can also be fitted onto the retaining lug 110.

[0083] The protruding spring end 106 has a support bend 112 as a transition to the spring leg 100, which is led as a step-like or approximately S-shaped transverse offset over the curvature 94 of the recess 92 to the rear of the frame.

[0084] In the area of ​​the retaining lug 110, a gripping or handle offset 114, oriented towards the respective transverse profile 8, is formed on the spring end 106. The long L-shaped leg of the spring end 106 thus stands between the offsets 112, 114, inclined upwards at an angle from the rear.

[0085] To attach the protective system 2 or protective window, the spring ends 106 of the torsion springs 98 are bent away from the rear of the frame by means of a torsion and secured to a rebate frame of the window opening by means of the preload or the resulting (spring) restoring force. For this purpose, an edge of the rebate frame (rebate frame edge) is gripped from behind using the respective retaining lug 110. Due to the grip offset 114, the spring ends 106 do not lie flush against the rear of the frame, but protrude slightly from it. This makes it easy for a user to grip the spring ends 106 in the area of ​​the respective grip offset 114 in order to move the respective retaining lug 110 behind the rebate frame edge. The spring force of the torsion springs 98 can be adjusted by their material, in particular spring steel, their length, and their leg thickness.

[0086] The torsion springs 98 enable a non-destructive, detachable and reliable mounting of the protection system 2 on a window frame.

[0087] The torsion bar spring 98 is shaped such that its spring end 108 is suitably supported in the joining chamber 30, so that during a pivoting movement of the spring end 106 protruding from the corner connector 10, the spring leg 100 bearing this end can twist, but not the spring leg 102. Twisting of the spring leg 100 is achieved by the special shape of the connecting section 104.

[0088] The claimed invention is not limited to the embodiments described above. Rather, other variants of the invention can also be derived by a person skilled in the art within the scope of the disclosed claims without departing from the subject matter of the claimed invention. In particular, all individual features described in connection with the various embodiments can also be combined in other ways within the scope of the disclosed claims without departing from the subject matter of the claimed invention. Reference symbol list 2 Protection system 4 frame system 6 Profile strip, longitudinal profile 8 Profile strip, cross profile 10 corner connectors 12 system frames 14 protective grilles 15 retaining element 16 Soil profile 18 diagonal brace 20 cross brace 22 profile connectors 24 door handles 26 hinge 28 Reset device 30 joining chamber 32 Admission chamber 34 Admission chamber 36 profile longitudinal slots 38 profile longitudinal slots 40 sealing element 42 footlets 44 Corner piece 46 Cover collars 48 Admission chamber 50 longitudinal slots 52 Admission chamber 54 longitudinal slots 56 In-depth study 58 Joinery 60 joining wedges 62 Joining contour 64 hinge 66 hinge pins 68 hinge 70 bolt shaft 72 bolt head 74 Ring groove 76 retaining ring 78 Mounting opening 80 Feedthrough opening 82 Feedthrough opening 84 Joining contour 86 Handle 88 Retaining cord 90 Guide channel 92 recess 94 Curvature 96 In-depth study 98 Spring element, torsion bar spring 100, 102 spring legs 104 Connecting section 106, 108 Spring end 110 retaining lug 112 Support crank 114 Gripping crank L leg longitudinal direction Q Leg transverse direction QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2021 101 588 U1

[0006] DE 20 2014 005 807 U1

[0006] DE 20 2023 107 630 U1

[0008]

Claims

[1] Corner connectors (10) for connecting at least two profile strips (6, 8) of a frame system (4), comprising - two perpendicularly extending leg sections (42) and a corner section (44) arranged between them, - wherein at least one leg leg (42) has a guide groove (90) extending along a leg longitudinal direction (L) for at least partial guidance of a spring element (98), - wherein the guide channel (90) opens into a rearwardly open recess (92) of the corner part (44), and - wherein the foot leg (42) has a recess (96) on its front side to receive a spring end (108) of the spring element (98). [2] Corner connector (10) according to claim 1, characterized by , that the recess (92) has a bulge (94) arranged transversely to the longitudinal direction (L) of the leg as a support surface for the spring element (98). [3] Corner connector (10) according to claim 1 or 2, characterized by , - that the corner part (44) has a first receiving chamber (48) accessible via a rear longitudinal slot (50) for a retaining element (15) for the frame-side attachment of a protective grille (14), and / or - that the corner part (44) has a second receiving chamber (52) accessible via a longitudinal slot (54) on the rear of the frame for a sealing element (40). [4] Corner connector (10) according to one of claims 1 to 3, characterized by , that at least one of the leg legs (42) has a joining groove (58) extending in the longitudinal direction (L) of the leg on its front side for receiving a joining contour (62) of a functional element (26), wherein the joining groove (58) extends at least partially into the corner part (44). [5] Corner connector (10) according to claim 4, characterized by , that a joining wedge (60) covering at least part of the joining groove (58) is inserted or can be inserted into the joining groove (58). [6] Frame system (4) for a protective system (2), comprising a system frame (12) composed of profile strips (6, 8, 16, 20), wherein at least two profile strips (6, 8) are connected or connectable to a frame corner with a corner connector (10) according to any one of claims 1 to 5. [7] Frame system (4) according to claim 6, wherein a hinge (26) is joined or can be joined as a functional element with the corner connector (10), characterized by , that the hinge (26) has a first hinge band (64) with a joining contour (84) for the joining groove (58) of the corner connector (10), and a second hinge band (68) which is rotatably or pivotably coupled to the first hinge band (64) via a hinge pin (66). [8] Frame system (4) according to claim 7, characterized by, that the hinge pin (66) is provided on its free end with a circumferential annular groove (74) into which an elastic retaining ring (76) is inserted for axially positive locking of the hinge pin (66) on the hinge bands (64, 68). [9] Frame system (4) according to one of claims 6 to 8, wherein a torsion bar spring (98) is provided as a spring element, characterized by , - that the torsion spring (98) has a first spring leg (100) and a second spring leg (102) running parallel to it, which are connected to each other at a respective first leg end, and which are seated in a joining chamber (30) of one of the profile strips (6), wherein the first spring leg (100) is guided at least partially in the guide groove (90) of the corner connector (10), - that a spring end (106) of the first spring leg (100) exits the corner connector (10) via the recess (92), and - that one end of the spring (108) of the second spring leg (102) is fixed in the recess (96) of the corner connector (10). [10] Frame system (4) according to claim 9, characterized by , that the first spring leg (100) has a support bend (112) which is supported on the curvature (94) of the recess (92). [11] Protective system (2), in particular protective door or protective window, comprising a frame system (4) according to any one of claims 6 to 10 and a protective grille (14).

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