Corner connector

Abstract

A corner connector for connecting two hollow chamber profiles (3) of windows, doors or the like is described, wherein the corner connector (1) for hollow chamber profiles (3) is designed with a rectangular inner cross-section (5), formed by two inner transverse surfaces (6, 7) and two inner longitudinal surfaces (8, 9), and has a shaft part (2) for insertion into one of the hollow chamber profiles (3), wherein the shaft part (2) extends along a longitudinal axis (L) defining an axial direction, a clamping body (4) designed as a rigid component (10), which has an outer transverse surface (11) for bearing against one of the inner transverse surfaces (6, 7) and an outer longitudinal surface (12) for bearing against one of the inner longitudinal surfaces (8, 9) and is axially displaceable on the shaft part (2), and a clamping structure (24, 27, 30, 31), which enables the axial displacement of the clamping body (4) in a implement a relative movement (16) transverse to the longitudinal axis (L) between the shaft part (2) and the clamping body (4),to clamp the corner connector (1) between the inner transverse surfaces (6, 7) and the inner longitudinal surfaces (8, 9), wherein the transverse relative movement (16) pushes the rigid clamping body (4) away from the shaft part (2) and runs obliquely both to a plane defined by the outer transverse surface (11) and to a plane defined by the outer longitudinal surface (12).

Description

[0001] The invention relates to a corner connector for connecting two hollow chamber profiles of windows, doors or the like, wherein the corner connector for hollow chamber profiles is designed with a rectangular inner cross-section, formed by inner transverse surfaces and two inner longitudinal surfaces, and comprises: a shaft part for insertion into one of the hollow chamber profiles, wherein the shaft part extends along a longitudinal axis defining an axial direction, a clamping body which is axially displaceable on the shaft part, and clamping structures which convert the axial displacement of the clamping body into a relative movement between the shaft part and the clamping body which runs transversely to the longitudinal axis in order to clamp the corner connector between the inner transverse surfaces and the inner longitudinal surfaces.

[0002] Corner connectors are used to connect two hollow chamber profiles, usually mitered, in which they are fixed. An important requirement is that the corner connector, once inserted into a hollow chamber profile, is fixed particularly firmly in the hollow chamber profile so that the corner connector can fulfill its intended stiffening and fastening function. For this purpose, corner connectors are known that are driven into the hollow chamber profile with a slight oversize and additionally secured there with screws. An alternative approach, which is advantageous in terms of assembly precision, is clampable corner connectors, which can be inserted into the hollow chamber profile. This means that they have an outer dimension that is slightly smaller than the inner dimension of the hollow chamber profile and are then clamped in the hollow chamber profile.

[0003] EP 0 698 720 A1 created a new class of these clampable corner connectors, which features the aforementioned shaft part and the aforementioned clamping body. The latter's axial displacement raises the clamping body relative to the shaft part by means of a clamping structure, thus clamping the shaft part in the hollow chamber profile between the inner transverse surfaces. The aforementioned publication provides bevels for the clamping structure for this purpose. Understandably, however, this clamping structure can also be designed differently, for example, with rounded surfaces, as provided in DE 10 2007 030 618 B3.

[0004] In these designs, the clamping body ensures reliable clamping of the shaft part in the hollow chamber profile, but this clamping only acts in one direction, namely transversely to the upper inner transverse surface, at which the clamping body is lifted during axial displacement.

[0005] DE 100 39 403 C1 further develops the approach of EP 0 698 720 A1 in that the clamping body not only lifts transversely to the inner transverse surfaces, but also clamps itself at the upper edge of the hollow chamber profile between the longitudinal sides of the hollow chamber profile by means of an end that expands elastically when pulled out and is driven by another clamping structure. This also clamps the inner longitudinal sides of the hollow chamber profile. DE 19 30 039 A1, considered in the preamble, achieves the same with the embodiment according to the Figur 4 Here, the clamping body is formed as a corner on the shaft part. Two sequences of wedge surfaces are formed on the shaft part, one sequence along the underside and the other along a side surface of the shaft part, and the clamping body has matching sequences of counter-wedge surfaces. An eccentric screw is inserted through the top of the shaft part, which engages the shaft part by means of the eccentric effect and displaces the shaft part, whereby the wedge surfaces and counter-wedge surfaces push the clamping body diagonally away from the shaft part.

[0006] DE 10 2007 030 618 B3 represents a departure from the directly acting clamping element, in that the clamping element no longer rests against the inner wall sections of the hollow chamber profile, but instead acts on an expansion element. It is designed as a downwardly open U-shaped component that is inserted over the shaft section. The expansion element has two expansion plates forming the legs of the "U," which rest against the inner longitudinal surface of the hollow chamber profile and are also resilient relative to the base of the "U." The clamping element no longer acts directly, but rather lifts the expansion element during its axial displacement. This lifts the base of the "U" and presses it against an inner transverse surface of the hollow chamber profile. This clamps the shaft section transversely to the upper inner transverse surface. The two resilient expansion plates forming the legs of the "U" are located on the longitudinal sides of the shaft section.The longitudinal sides of the shaft part, as well as the inner surfaces of the expansion plates facing these longitudinal sides, are designed with inclined surfaces that resiliently push the expansion plates outward when the expansion element is lifted by the clamping body. In this way, the resilient expansion plates of the shaft part also clamp transversely to the inner longitudinal surfaces. DE 20 2008 008 250 U1 designs these expansion plates as two L-shaped bodies, between which the clamping body lies. The vertical line of the "L" forms the expansion plates. The transverse line of the "L" forms a short leg and lies on the cover side of the shaft part. Each L-shaped body is designed with a resilient, flexible rigid joint between the short leg and the expansion plate.

[0007] The invention is based on the object of developing a generic corner connector in such a way that the bracing is improved in both bracing directions.

[0008] The object is achieved according to the invention by a corner connector according to claim 1. The subclaims relate to preferred developments.

[0009] Corner connectors are typically designed to connect two hollow chamber profiles of windows, doors, or similar. They can be mitered, for example, and are preferably made of weldable plastic. Typically, hollow chamber profiles are provided with an internal metal profile for reinforcement. This does not need to be mitered. For strength reasons, the corner connector is then inserted into the metal profile. Corner connectors are designed for hollow chamber profiles with a rectangular internal cross-section formed by two internal transverse surfaces and two internal longitudinal surfaces. This is typically the internal cross-section of the reinforcing metal profile. The corner connector has a shaft portion for insertion into the internal cross-section. It extends along a longitudinal axis that defines an axial direction.The corner connector further comprises a clamping body which is axially displaceable on the shaft part, as well as a clamping structure which is usually formed on the clamping body and shaft part. The clamping structure converts the axial displacement of the clamping body into a relative movement between the shaft part and the clamping body which runs transversely to the longitudinal axis. In this way, the corner connector is clamped in the inner profile, i.e. between the inner transverse surfaces and the inner longitudinal surfaces of the hollow chamber profile. The clamping body is designed as a rigid component. It has an outer transverse surface for contact with one of the inner transverse surfaces and an outer longitudinal surface for contact with one of the inner longitudinal surfaces. The clamping structure is designed such that the transverse relative movement pushes the clamping body away from the shaft part, which runs obliquely to both a plane defined by the outer transverse surface and a plane defined by the outer longitudinal surface.The clamping body thus presses with its outer transverse surface onto one of the inner transverse surfaces and with its outer longitudinal surface perpendicular to it onto one of the inner longitudinal surfaces.

[0010] Thus, in particular, a corner connector is provided for connecting two hollow chamber profiles of windows, doors or the like, wherein the corner connector for hollow chamber profiles is designed with a rectangular inner cross-section, formed by two inner transverse surfaces and two inner longitudinal surfaces, and has a shaft part for insertion into one of the hollow chamber profiles, wherein the shaft part extends along a longitudinal axis defining an axial direction, a clamping body designed as a rigid component, which has an outer transverse surface for bearing against one of the inner transverse surfaces and an outer longitudinal surface for bearing against one of the inner longitudinal surfaces and is axially displaceable on the shaft part, and a clamping structure which converts the axial displacement of the clamping body into a relative movement between the shaft part and the clamping body, which runs transversely to the longitudinal axis, in order to clamp the corner connector between the inner transverse surfaces and the inner longitudinal surfaces,wherein the transverse relative movement pushes the rigid clamping body away from the shaft part and runs obliquely both to a plane defined by the outer transverse surface and to a plane defined by the outer longitudinal surface.

[0011] Unlike the prior art, a clamping body is not created that is displaced perpendicularly toward an inner transverse surface by a clamping structure and also has a resilient part (end of the clamping body in DE 100 39 403 C1) or drives it (spreading plates in DE 10 2007 030 618 B3 or DE 20 2008 008 250 U1) that is pressed perpendicularly onto the inner longitudinal surfaces by another clamping structure. Rather, the clamping body is now designed as a rigid component that has two cover sides that are essentially perpendicular to one another, namely the outer transverse surface and the outer longitudinal surface, and this rigid component is pressed away from the shaft part by (only) one clamping structure at an angle to the bracing directions. Thus, resilient sections on surfaces that are intended to effect bracing transversely to one another, as was required in the prior art, are no longer provided.Due to the oblique relative movement, the outer transverse surface of the rigid clamping body is pressed against one of the inner transverse surfaces and the outer longitudinal surface of the rigid clamping body is pressed against the inner longitudinal surface of the hollow chamber profile.

[0012] Particularly preferably, the relative movement is uniaxial, i.e., along one direction, in particular, linear along one axis. In this way, a relative movement of the clamping body in one direction, i.e., uniaxial, clamps and fixes the corner connector in the hollow chamber profile biaxially, i.e., in the direction of two mutually perpendicular axes.

[0013] Particularly preferably, the relative movement runs towards a corner between the inner transverse surface and the inner longitudinal surface.

[0014] For the clamping effect, it is sufficient if the relative movement is at an angle of 20° to 45° to one of the two defined planes. With a 45° movement, the rigid clamping body is pressed exactly against the corner formed between the inner transverse surface and the inner longitudinal surface. If you deviate from this angle, you achieve a clamping force that is greater in one direction than in the other. This can be advantageous for certain tolerances of the hollow chamber profile, for example if it has a larger height tolerance, i.e. along the inner longitudinal surfaces, than transverse to it, i.e. along the inner transverse surfaces. Such a different tolerance can be compensated for by a relative movement that is not at 45° to one of the two defined planes, since the relative movement then leads to a stronger clamping force in the direction in which the dimensional tolerance is larger.

[0015] The clamping body is inserted into a recess in the shaft part. This recess preferably extends over an area corresponding to a corner between the inner transverse surface and the inner longitudinal surface, and leaves at least parts of the cover surface and side surface of the shaft part exposed. The rigid clamping body can then be designed as a rigid corner part, which has the outer transverse surface and the outer longitudinal surface such that these complement the parts of the cover surface and side surface of the shaft part left exposed by the recess. Thus, the shaft part with the inserted clamping body achieves a substantially rectangular outer cross-section of the corner connector. The corner connector is then divided essentially in the diagonal direction of this outer profile, namely into the shaft part and the clamping body inserted into the corresponding recess.

[0016] The shaft part usually carries the miter surface, which is intended for welding to another corner connector and does not participate in the bracing effect of the corner connector itself.

[0017] For manufacturing reasons, the recess is preferably located at the end of the shaft part that is to be inserted into the hollow chamber profile and extends from there over at least 50% of the axial length of the shaft part, preferably to the aforementioned miter surface. The outer transverse surface and outer longitudinal surface of the shaft part preferably make up at least 30% of the corresponding inner transverse surface or the corresponding inner longitudinal surface. The recess has an appropriate size for this. Particularly preferably, the outer transverse surface of the clamping body forms the entire outer transverse surface of the corner connector. The largest possible contact area of ​​the outer transverse surface and the outer longitudinal surface on the hollow chamber profile is advantageous for the clamping effect, as this counteracts any tilting of the corner connector during clamping.

[0018] In the clamped state, the clamping body preferably rests on exactly one inner transverse surface and exactly one inner longitudinal surface, and the shaft part only rests on the two remaining inner surfaces.

[0019] The clamping structures effect the relative movement of the clamping body and the shaft part for clamping. For this purpose, a wedge structure is provided on the clamping body, which is formed on a base plane that lies obliquely to the two defined planes. A counter-wedge structure designed to match the wedge structure is provided in the recess, which together with the wedge structure forms the clamping structure. Due to the oblique position, the oblique relative movement can be achieved relatively easily; it runs perpendicular to the base plane. At the same time, such wedge structures are particularly easy to manufacture using the injection molding process, as they pose no problems with regard to demolding the finished product from the injection molds. This design has the further advantage that, unlike in DE 19 30 039 A1, the area of ​​the wedge structure and the area of ​​the counter-wedge structure, which are mutually engaged, always remain the same for both structures throughout the displacement.In contrast, in DE 19 30 039 A1, both surfaces decrease with displacement. This means that the clamping force and locking effect are now independent of the displacement of the clamping body. Furthermore, there is no movement along the base plane, which means that the entire applied force is used for clamping without unnecessary friction losses. Furthermore, with the wedge structure and counter-wedge structure, the force acts perpendicular to the base plane of the wedges, achieving better locking. This makes it easier to secure the wedge surfaces with serrations to prevent slipping back, which is why serrations of this type are preferred.

[0020] As already mentioned, the shaft part usually has a miter surface which is used for welding to another corner connector. For clamping the clamping parts, EP 0 698 720 A1, already mentioned as fundamental at the beginning, established a principle that has been regularly used for corner connectors ever since. The clamping body protrudes beyond the miter surface with an axially extending elongated web. The clamping body can be pulled along this web for axial displacement. The design of the clamping body beyond the miter surface makes it very easy to work with a pulling tool which, with a lever movement, pulls the elongated web and thus the clamping body forward relative to the miter surface and at the same time supports itself against the miter surface and the mitered hollow chamber profile.This reliably ensures that the corner connector, with its mitered surface, precisely matches the miter of the hollow chamber profile. This concept can, of course, also be used with particular advantage for the corner connector in question here. However, since the clamping body is designed as a rigid component, the elongated web moves transversely to the mitered surface due to the relative movement. It is therefore preferably provided that the opening through which the elongated web protrudes in the mitered surface is larger than the web cross-section, creating space for the elongated web to move due to the transverse relative movement.

[0021] The use of the clamping body as a rigid component that performs an oblique relative movement (oblique to the inner surfaces of the hollow chamber profile) makes it easy to provide cooperating locking devices on the shaft part and clamping body, which secure the clamping body in a pre-assembled state. In this pre-assembled state, the web is pushed through the opening, but the corner connector is not yet inserted into the hollow profile and is not yet clamped. In this state, the corner connector is usually brought into the production of windows, doors, or similar. The fact that the clamping body is captively secured to the shaft part by the locking devices is a particular advantage, as it facilitates handling of the corner connector in a production environment for windows, doors, or similar.

[0022] The wedge structure on the shaft part can be implemented particularly simply by having the shaft part taper along its longitudinal axis in a wedge section, which forms the wedge structure. The expansion element, with a corresponding counter-wedge, can slide along this wedge structure when it is moved axially.

[0023] The axial movement of the clamping body and the axial movement of the expansion element usually occurs from the hollow chamber profile, i.e., toward the mitered surface formed on the shaft part. To drive the axial movement, the clamping body can be equipped with a detachable or removable pull tab, pull eye, etc., or a thread into which a screw engages.

[0024] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

[0025] The invention is explained in more detail below using exemplary embodiments with reference to the attached drawings, which also disclose features essential to the invention. These exemplary embodiments are for illustrative purposes only and are not to be interpreted as restrictive. For example, a description of an embodiment with a large number of elements or components should not be interpreted to mean that all of these elements or components are necessary for implementation. Rather, other embodiments may also contain alternative elements and components, fewer elements or components, or additional elements or components. Elements or components of different embodiments may be combined with one another unless otherwise stated. Modifications and variations described for one of the embodiments may also be applicable to other embodiments.To avoid repetition, identical or corresponding elements in different figures are designated by the same reference numerals and are not explained more than once. The figures show: . Fig. 1a perspective view of a corner connector which is inserted into a hollow chamber profile, Fig. 2a perspective view of the corner connector of the Fig. 1 without hollow chamber profile, Fig. 3 an exploded view of the corner connector of the Fig. 2 , Fig. 4 an exploded view of the corner connector of the Fig. 2 in a modified design with regard to a clamping structure which serves to clamp the corner connector in the hollow chamber profile, Fig. 5 a perspective view of a clamping body of the corner connector of the Fig. 1 and 2 and Fig. 6a view of the corner connector of the Fig. 1 from behind, ie from the right in Fig. 1 .

[0026] The Fig. 1 bis 3 show a corner connector 1, which has a shaft part 2, which in the illustration of the Fig. 1 is inserted into a hollow chamber profile 3. In the illustration of the Fig. 2 the corner connector 1 is shown without hollow chamber profile 3, and in the illustration of the Fig. 3 A clamping body 4, which is a component of the corner connector 1 and serves to clamp the corner connector 1 inside the hollow chamber profile 3, is removed from the shaft part 2. In all drawings, structures that correspond in terms of their structural design or functional significance are designated by the same reference numerals.

[0027] The corner connector 1 is clamped inside the hollow chamber profile 3, whose inner cross-section 5 is formed by two inner transverse surfaces 6, 7 forming the narrow side of the inner cross-section 5 and two inner longitudinal surfaces 8, 9 forming the long sides of the inner cross-section 5. Of course, the rectangular inner cross-section 5 can also be square. The corner connector 1 is clamped with its shaft part 2 and the clamping body 4 inside the hollow chamber profile 3. In the illustrated embodiment, the hollow chamber profile 3 is a metal profile that lies inside a miter-cut plastic profile (not shown) and stiffens it.

[0028] The clamping body 4 is designed as a rigid corner piece 10, which has an outer transverse surface 11, which lies toward the inner transverse surface 6, and an outer longitudinal surface 12, which lies toward the inner longitudinal surface 9. These two outer surfaces press against the corresponding inner surfaces, since the clamping body 4, when displaced axially along a direction 13, is pressed transversely to the longitudinal extent L of the corner connector 1 and its shaft part 2 by the shaft part 2, i.e., outwards. The direction 16 of this relative movement is indicated in the figures by a dashed arrow. The clamping body 4 is pressed away from the shaft part 2 in the direction 16 when it is displaced in the axial direction 13, for which purpose, for example, by means of a tool that is supported on a miter surface 14 which the shaft part 2 has, a pull tab 15 attached to the clamping body 4 is pulled in the direction 13.

[0029] As the exploded view of the Fig. 3 shows the relative displacement along the direction 16 ( Fig. 2 , 5 , 6 ) is achieved in that a clamping structure presses the clamping body 4 and the shaft part 2 apart when the clamping body 4 is axially displaced. The clamping structure comprises two counter wedges 24 on the shaft part, which are arranged on an inclined base plane 22 and interact with wedges 31 which also belong to the clamping structure and which are arranged on an inclined base plane 25 on the clamping body 4 lying parallel thereto. The counter wedges 24, together with the Fig. 5 The wedges 31 shown in the drawing ensure that the axial movement along direction 3 for the clamping body 4 is converted into the relative movement along direction 16. As a result, the outer transverse surface 11 presses against the inner transverse surface 6 and the outer longitudinal surface 12 against the inner longitudinal surface 9. The same applies to the outer transverse surface 18 and the outer longitudinal surface 19 of the shaft part 2, which are pressed against the remaining inner surfaces. In this way, the corner connector 1 expands in the inner cross-section 5 of the hollow chamber profile 3 and clamps the corner connector in the hollow chamber profile 3. Fig. 5 The two wedges 31 are each designed as a pair of wedges; this is optional. They can also be continuous, like the counter wedges 24, which in turn can also be designed as a pair. Furthermore, one wedge (or pair of wedges) 31 and one counter wedge (or pair of counter wedges) 24 are also sufficient.

[0030] In the illustrated embodiment, the outer transverse surface 18 and the outer longitudinal surface 19 of the shaft part 2 have, purely as an example and optionally, contact structures designed as webs, which in the clamped state rest against the corresponding inner surfaces of the hollow chamber profile 3. This is shown in Fig. 6 shown, which will be discussed later. These bars facilitate production.

[0031] Fig. 4 shows a design of the corner connector 1, which is modified with regard to the clamping structure. Instead of a single base plane 22 or 25 for the wedges and the counter wedges, two mutually perpendicular base planes 26, 29 are provided on the shaft part 2, on which corresponding counter wedges 27, 30 are located. The wedges are aligned analogously on the clamping body 4. Thus, the base plane 22, which in the embodiment of the Fig. 3 perpendicular to the relative direction 16, replaced by two mutually perpendicular base planes, and the relative direction 16 is the angle bisector between these base planes. The effect achieved by this clamping structure is the same; upon axial displacement of the clamping body 4, the clamping body 4 and the shaft part 2 are pressed apart along the relative direction 16.

[0032] Fig. 6 shows the corner connector 1 inserted into the hollow chamber profile 3 from behind, corresponding to a view from the right in the illustration of the Fig. 1 As can be seen, the shaft part 2 rests with contact webs 32 to 35 against the inner transverse surface 7 and the inner longitudinal surfaces 8, 9. The relative movement along the relative direction 16 ensures that the outer transverse surface 11 and the outer longitudinal surface 12 are pressed against the inner transverse surface 6 and the inner longitudinal surface 8, respectively. The clamping body thus rests against two adjacent inner surfaces of the hollow chamber profile. At the same time, the contact webs 32 to 35 are pressed against the two other, adjacent inner surfaces of the hollow chamber profile 3, so that clamping is achieved. The web 20 is provided to support the insertion process; in the clamped state, it does not rest against the inner wall of the hollow chamber profile 3 and is therefore not a contact web.

[0033] For the bracing, it is essential that the clamping body 4 is a rigid component, as is the shaft part 2. No spring-mounted elements of the shaft part 2 or the clamping body 4 are involved in the bracing.

[0034] The shaft part 2 has a recess 23, which, viewed in cross-section, extends approximately to the diagonal of the hollow chamber profile 3. This recess 23 accommodates the clamping body 4 and has at its base the elements of the clamping structure assigned to it, e.g. the counter wedges 24, 27, 30. In the recess 23, webs 36 to 38 are preferably provided (one web would be sufficient in principle), which interact with at least one undercut 29 on the clamping body 4 in such a way that in the assembled state according to Fig. 2 the shaft part 2 can no longer be easily detached from the clamping body 4 when the web 17 protrudes through the opening 21 on the front side of the shaft part 2 and protrudes on the mitre surface 14 and the undercut 39 is located between the opening 21 and the web 36-38. In such a pre-assembled state, which corresponds to the Fig. 2 the clamping body 4 cannot fall off the shaft part 2, even if it is positioned opposite to the illustration of the Fig. 2into an upright position or even upside down.

[0035] The opening 21 is significantly larger than the cross-section of the web 17, since the latter must move along the relative direction 16 within the opening 21 during tensioning. The opening 21 has a corresponding oversize and, in particular, lateral clearance for this movement.

[0036] All wedge surfaces described here are preferably designed to lock in place, i.e., with a suitable microstructure, e.g., corrugation. When reference is made here to a clamping structure, this is to be understood as comprising elements arranged on two bodies and cooperating with one another, which convert a displacement of one body relative to the other body in a direction of displacement into a movement of one body transverse to the direction of displacement. In the embodiments, cooperating, flat bevels are used as a wedge or counter-wedge structure. However, this is not the only possible implementation. Rounded surfaces, non-flat bevels, or structures with levers, etc. can equally be used as elements of the clamping structure.

Claims

1. Corner connector for connecting two hollow chamber profiles (3) of windows, doors or the like, wherein the corner connector (1) for hollow chamber profiles (3) is designed with a rectangular inner cross-section (5), formed by two inner transverse surfaces (6, 7) and two inner longitudinal surfaces (8, 9), and comprises - a shaft part (2) for insertion into the inner cross-section (5), which extends along a longitudinal axis (L) defining an axial direction, and - a clamping body (4) which is axially displaceable in a recess (23) on the shaft part (2), - wherein the axial displacement of the clamping body (4) causes a relative movement (16) transverse to the longitudinal axis (L) between the shaft part (2) and the clamping body (4) in order to clamp the corner connector (1) between the inner transverse surfaces (6, 7) and the inner longitudinal surfaces (8, 9), - wherein the clamping body (4) is designed as a rigid component (10) and has an outer transverse surface (11) for contact with one of the inner transverse surfaces (6,7) and an outer longitudinal surface (12) for contact with one of the inner longitudinal surfaces (8, 9), - wherein the corner connector has a clamping structure (24, 27, 30, 31) acting between the rigid clamping body (4) and the shaft part (2), which, during the axial displacement, pushes the rigid clamping body (4) away from the shaft part (2) in the transverse relative movement (16), and - wherein the transverse relative movement (16) runs obliquely both to a plane defined by the outer transverse surface (11) and to a plane defined by the outer longitudinal surface (12), , characterized in that - the clamping structure (24, 27, 30, 31) comprises a wedge structure (31) formed on the clamping body (4), which is formed on a base plane (25) which lies obliquely both to the plane defined by the outer transverse surface (11) and to the plane defined by the outer longitudinal surface (12), and a counter-wedge structure formed in the recess (23) to match the wedge structure (31).

2. Corner connector according to claim 1, characterized in that the relative movement (16) is uniaxial, so that the rigid clamping body (4) clamps the corner connector (1) biaxially in the hollow chamber profile (3) by the uniaxial relative movement (16).

3. Corner connector according to claim 1 or 2, characterized in that the relative movement (16) is at an angle of 20° to 45° to one of the two defined planes.

4. Corner connector according to one of the above claims, characterized in thatthe shaft part (2) has a recess (23) for receiving the clamping body (4), which extends over the region of a corner between one of the inner transverse surfaces (6, 7) and one of the inner longitudinal surfaces (8, 9) and leaves at least parts of one of the cover sides and one of the side surfaces of the shaft part (2) free, and the rigid clamping body (4) is designed as a rigid corner part which has the outer transverse surfaces (11) and an outer longitudinal surface (12) which supplement the parts of the cover side and the side surface left free by the recess (23).

5. Corner connector according to one of the above claims, characterized in that the shaft part (2) has a recess (23) for receiving the clamping body (4), which recess is located at the end of the shaft part (2) to be inserted into the hollow chamber profile (3) and extends from there over at least 50% of the axial length of the shaft part (2).

6. Corner connector according to one of the above claims, characterized in thatthe shaft part (2) has a recess (23) for receiving the clamping body (4), which leaves at least 30% of one of the inner transverse surfaces (6, 7) and at least 30% of one of the inner longitudinal surfaces (8, 9) free on the shaft part (2).

7. Corner connector according to one of the above claims, characterized in that a micro-groove for locking is formed on the wedge structure (31) formed on the clamping body (4) and on the counter-wedge structure formed in the recess (23) to match the wedge structure (31).

8. Corner connector according to one of claims 1 to 6, characterized in that the shaft part carries a miter surface (14) which is intended for welding to another corner connector and does not participate in the bracing effect of the corner connector itself.

9. Corner connector according to claim 8, characterized by, the rigid clamping body (4) carries an axially extending, elongated web (17) which projects through an opening (21) in the mitre surface (14) and with which the rigid clamping body (4) is pulled for axial displacement, wherein the opening (21) is dimensioned so larger than the web cross-section that the elongated web (17) moves transversely to the longitudinal direction (L) during the transverse relative movement (16) in the opening (21).

10. Corner connector according to claim 9, characterized in that the shaft part (2) and the rigid clamping body (4) have cooperating locking means (36-39) which secure the clamping body in a pre-assembled, still unclamped state on the shaft part (2) when the web (17) is pushed through the opening (21).

11. Corner connector according to one of the above claims, characterized in that it is manufactured using an injection molding process.

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