DE102007035816A1 - Composite profile for frame piece of e.g. window, has plastic parts attached to metal-hollow profile by halting bars, which run along two straight lines, where distance between lines is greater than projecting length of parts - Google Patents

Abstract

The profile has a metal-hollow profile (1) provided on profile sides (4, 5) having plastic parts (6, 7) of rigid poly vinyl chloride. The profile has inclined planes (23, 24) at ends, where the planes project over an end surface of the hollow profile. The plastic parts are attached to the metal-hollow profile by halting bars (8-11), which engage into halting grooves (12, 13, 15) at the hollow-profile in a form-fit manner. The bars run along two straight lines, where distance between lines is 2.5 times of a projecting length of the plastic parts over the metal-hollow section.

Description

The The invention relates to a composite profile as a frame piece for frame of windows, doors or the like., With a metal hollow profile, on his to the outside and Inside of the frame lying profile sides each with a Planking is provided in the form of a plastic part.

It is known for the frames of windows, doors or the like. Use plastic hollow sections, the inside with Steel pipes are stiffened. But the steel tube is not above his entire outer circumference on the inner wall of the hollow profile, but it has rather Air around its outer surface and is only about outside, on the inner wall of the art-hollow profile mounted webs with respect to this supported although also usually about 1 mm of air over the Webs remains because in the manufacture of mostly hard PVC existing plastic hollow profiles whose inner contour (and thus also the training of the webs at this) with acceptable costs can not be made with such tight tolerances that no Game remains more. In addition, also have to be introduced Steel tubes clear tolerances.

Therefore be introduced into the PVC hollow profile stiffening tubes then screwed with this, with the PVC profile at the screw joints is pulled towards the steel tube and the screw usually only on one side of the profile, and there on the rebate, done. The main forces (thermal Load or similar) but act on the window frame substantially perpendicular to Direction of the fixing screws. Therefore, it happens that, before in the main load direction, the steel profile against the support webs comes to rest, the plastic hollow profile steel z. B. because of occurring thermal stress over its length becomes crooked, and Although due to the different thermal expansion on his Outside- and inside. But only when the steel pipe at the supporting webs it can be forces, it can take, but then the plastic hollow profile rod often already is clearly crooked.

From the EP 1 024 244 A2 a composite profile is known, in which two inner metal profiles, preferably made of aluminum, which are coupled together via a heat-conducting element, are foamed with plastic, wherein the plastic foam then forms or forms the window profile. As a result, a composite profile of very good rigidity is achieved.

Usually Such plastic profiles are mitred by the processor and butt welded to the mating profile at the profile corner. at this known, plastic-coated frame profile must this the aluminum will be cut through, but that's a problem results when welding is then performed at 250 ° C should. Because when welding the PVC is this melted by about 2 to 3 mm, a process that However, the aluminum does not follow, so that then the direct welding with the Counter profile on the miter surface not possible anymore is. Therefore you need in this known composite profile different connection technology at the miter points. To do this e.g. finished aluminum angle inserted into the aluminum tube, attached the counter profile and then glued the miter surfaces, optionally also mechanical fastening means are used in addition. Also, the aluminum angle is in the aluminum tube by gluing attached. But this results in the need for an extremely expensive Connection technology at the miter points during the processing of this known composite profile.

From the DE 296 10 654 U1 Furthermore, a composite profile for the frame double-glazed composite window is known which comprises a metal hollow profile, which is provided on its lying towards the outside and inside of the frame profile sides each with a planking, on the outside of the planking in the form of a plastic part and on the inside is formed in the form of a wooden part. However, between the composite profile and the planking on the inside and on the outside rubber profile strips interposed, on which, in each case to the metal hollow profile out, mold nubs protrude, which engage in corresponding mold cavities of the metal hollow profile and anchor the rubber profile strip there. The skins both on the outside, as well as on the inside are in the known composite profile obviously in each case on the side facing away from the metal hollow profile of the rubber profile strip adhered to this or otherwise secured. However, the interposition of the rubber profile strip results in mounted on the composite frame profile an undesirable, affecting the overall stability elastic component, due to which a solid, play-free seat of the planking is not guaranteed relative to the metal hollow profile, since the elasticity always a certain movement between planking and metal Hollow profile allowed. Also, the attachment of the skins on a rubber profile strip and only on its attachment to the metal hollow profile by means of the intervention of rubber studs in the form of receptacles of the metal hollow profile ultimately leads to a mounting seat, the occurrence of larger release forces, as under wind loads or other mechanical stresses may well occur as a result of Elasticity of the rubber material of the support projections may lead to an undesirable loosening of the attachment. In addition, in the known composite profile, seen in the direction perpendicular to the profile longitudinal axis, the projection of the planking on the glazing side and the opposite support side against the frame seal with the window closed relative to the position of the fastening knobs relatively large. Since the required compressive forces between the glazing and the planking, which must act to achieve a good seal on the sealing profile or in the closed state on the frame seal between the planking and the support frame, lead to an asymmetric pressure distribution in the respective protruding end portion of the planking occurs These projecting areas on an increased load on the planking in the direction of a detachment from the carrier profile out, the like by additional action of wind forces or other loading forces on the glazing o. to be reinforced. If, as in the known composite profile, here in each case a relatively large supernatant exists, there is the danger that there is a detachment of the seal from the glazing or even to a release of the plumbing due to the long lever arm of the freely projecting end portion nearest mounting studs can come. In addition, this known composite profile is not suitable because of its basic structure with an intermediate rubber profile strip mitred cut and then butt to be welded with a corresponding miter-cut counter-profile to a profile corner of the frame profile. Therefore, the use of other types of connection techniques at the mitring point is also required here, as has already been explained above with regard to another prior art.

outgoing This is the object of the invention, a plastic frame profile for windows, Doors or Like. Propose that at the profile corner dull with a counter profile welded without difficulty can be, a particularly big one Stiffness and no play between the metal hollow section and the Plastic skins shows and also a particularly safe Seat even with strong pressure loads in the area of the overhangs of the Plastic skins over their investment results in the metal hollow profile addition.

According to the invention this is achieved in a composite profile of the type mentioned, each - in the direction of the longitudinal axis of the frame piece seen - at both ends having an inclined surface inclined at an angle to the longitudinal axis, which over the assigned endface the metal hollow profile survives, being over the entire length the bevel of the Plastic part of the shortest projection in the direction of the longitudinal axis of the frame piece 2 mm to 20 mm, the sloping surfaces of both Plastic parts are located at each end of the frame piece in a common miter area, to the longitudinal axis of the frame piece by an equal angle as the inclined surfaces is inclined, furthermore each Plastic part over integral to him trained, positively engaging in corresponding form receptacles on the metal hollow profile Mounting projections on Metal hollow profile is attached without play, and further wherein the holding projections along at least two to each other and to the longitudinal axis of the frame piece on Plastic part extending straight lines are attached, whose distance from each other (again seen perpendicular to the longitudinal axis of the frame piece) at least 2.5 times the supernatant the relevant plastic part beyond the metal hollow profile, seen in the direction perpendicular to the straight line is.

The Composite profile according to the invention points first the big one Advantage of a modular structure, as in a casing an internal metal hollow profile by plastic in one Extrusion tool or by molding or similar. is not given. In order to will it be possible that the Individual parts of this modular composite profile of the processor from each other can be cut separately at the point of use in the desired length. According to the invention doing the cutting so that the subsequent Put together the parts at the Gehrungsstellen of the resulting composite profile piece respectively a supernatant the plastic parts over the metal hollow profile of at least between them 2 mm to 20 mm is given. This allows the plastic parts then on Miter welded because of this supernatant Ensures adequate melting without this the intervening metal hollow profile disturbs. Then a normal Plastic corner connectors used and, as usual, mitverschweißt. The use of a special connection technology is not required here.

at the composite profile according to the invention the central metal hollow profile (carrier profile) with the lateral Kunststoffbeplankung by the integrally formed on him, profiled Holding operations firmly and connected without backlash, resulting in excellent rigidity without unwanted Spring effects results.

In the composite profile according to the invention by the required ratio between the distance between the at least two parallel lines along which the support projections are mounted, and the length of the supernatant of each plastic part over the metal hollow profile holding it out a particularly secure fit of the plastic parts on the metal hollow profile even with stronger pressure loads (in the region of the supernatant) in the direction of detachment from the carrier profile and thus always a solid and secure seat of the glazing ensured, since the lever arm at the freely projecting end portion of each plastic part in comparison to the distance of the anchoring points from each other is relatively small.

However, the composite profile according to the invention also offers, in addition, a plurality of further advantages:
Due to the modular structure of the composite profile according to the invention, it is possible to use different side panels when using one and the same metal hollow profile, so that it is possible to produce different outer contours of the frame to be created, without the need correspondingly different composite profiles should be kept.

So far it was also necessary for each color design of the frame concerned a correspondingly colored To keep plastic profile as a total part in stock. In the composite profile according to the invention This is no longer necessary because of its modular design Here only according to color differently different side parts are stored have to.

Also Needless in the modular structure of the composite profile according to the invention, that the metal hollow profile (Carrier profile) no more, as previously often inserted into the outer plastic part must become, because a lateral plastic planking takes place.

By the advantages shown can be considerable in terms of storage Savings in storage space as well as storage volume and thus significant cost advantages over the Case of using known frame profiles.

The holding projections can be as well as the mold holders on the metal holding profile in all for one positive and backlash-free attachment of plastic part and metal hollow profile perform suitable shapes, the skilled person for this purpose a variety of designs are known. Especially preferred become the support projections However, in the form of locking bars and the form of photographs in the form of Formed locking grooves. The locking can be provided in this way that it a detachable one or an insoluble one Latching acts.

For an indissoluble locking the latching webs and the locking grooves are very particularly preferred so educated that she have a substantially dovetail-shaped cross-section, resulting in both a play-free, as well as a very solid connection can reach between metal hollow section and plastic part.

In especially cheaper Embodiment of the invention, the plastic parts as plastic trays executed.

The Plastic parts can from each one for their use be made of suitable plastic material being particularly preferably made of foamed, weldable plastic consist. It is particularly advantageous if the plastic parts made of hard PVC, resulting in a very stable design the plastic parts leads.

Further In the case of the invention it is preferred if the plastic parts are identical are formed, thereby again saving in storage result.

The Metal hollow profile of the composite profile according to the invention may be made consist of any suitable metal, such. B. of mild steel. Especially however, it is preferably made of light metal, especially advantageously of aluminum or an aluminum alloy.

The Composite profile according to the invention leads overall not only to a noticeable saving in storage, but it can also easily cut by the processor on site, assembled and welded be so that it therefor no new processing techniques needed.

Preferably become the support projections fixed in the Rastnuten so that in Direction of the longitudinal axis of the composite profile, the plastic parts immovable on the metal hollow profile are attached. Also preferred is the metal hollow profile at its two longitudinal ends each with an end surface provided, which to the common miter surface of the two oblique end surfaces of both Plastic parts there in parallel, but offset at a distance to this, runs.

One especially secure fit of the plastic parts on the metal hollow profile even under strong pressure loads in the release direction of the attachment between both are left reach if the distance between the two lines is at least 80% the length is, along these - vertical seen to the straights - that Metal hollow profile rests on the plastic.

The Invention will now be described by way of example with reference to the drawing in principle even closer explained. Show it:

1 the individual parts of a composite profile according to the invention with a corner connector, in the unassembled state;

2 the composite profile 1 in assembled condition without corner connector;

3 the composite profile from the 1 and 2 but with inserted corner connector;

4 an (enlarged) cross section through a composite profile accordingly 2 , with cutting position perpendicular to the profile longitudinal axis, wherein only one of the two lateral plastic cover on the metal hollow profile is already fully attached, while the opposite plastic cover on the metal hollow profile is not yet attached, and

5 the representation according to 3 , but now also the second lateral plastic covering is attached to the metal hollow profile.

The presentation of the 1 shows, in a not yet assembled state, a portion of a composite profile as a frame piece of a frame for a window, a door or the like .: this comprises a metal hollow profile 1 in the form of an aluminum profile, which at its front end facing the viewer at an angle α (in the drawing: 45 °) to the longitudinal center axis LL of the metal hollow profile 1 Mitred cut. In the sectional plane is thereby of the various wall thicknesses of the metal hollow section 1 a miter 3 educated. The whole frame piece of which the 1 to 3 show only one section is at its other (in the 1 to 3 not shown) end in the same way as in the 1 to 3 , only mirror-symmetrical thereto, formed, ie, the oblique position of the individual inclined surfaces also extends at the same angle α to the longitudinal center axis LL of the metal hollow profile 1 , but one for the alignment of α, as in the 1 to 3 has shown opposite orientation, so that the assembled composite profile ( 3 ), seen in side view, shows the shape of an isosceles trapezium.

On each side 4 . 5 of the metal hollow profile 1 are plastic skins in the form of plastic shells 6 . 7 arranged plastic parts, each of which is at its the metal hollow section 1 facing side in each case two parallel to each other as well as to the longitudinal center axis LL of the metal hollow profile 1 extending support projections in the form of locking webs 8th . 9 such as 10 . 11 having, in each case in one piece on the relevant plastic part 6 respectively. 7 are formed. The central axes of the detent webs 8th . 9 respectively. 10 . 11 every plastic shell 6 . 7 which extend along two parallel straight lines A, B are at a distance X (perpendicular to the longitudinal axis LL of the hollow profile 1 ) away from each other (cf. 2 ).

In one of the position of the locking bars 7 and 8th respectively. 9 and 10 each corresponding position are on the sides 4 . 5 of the metal hollow profile 1 in each case parallel to one another and to the longitudinal center axis LL of the metal hollow profile 1 extending molds in the form of locking grooves 12 . 13 such as 14 . 15 (Illustration of the locking groove 15 out 2 and 3 visible) formed.

When assembling each of the plastic shells 6 and 7 to the side facing her 4 respectively. 5 of the metal hollow profile 1 laid laterally, with the locking webs 8th and 9 in the corresponding locking grooves 12 and 13 and the locking bars 10 and 11 in the corresponding locking grooves 14 and 15 intervene, as can be seen from the illustration of 3 it is apparent which all in 1 separated items shown in the assembled state shows.

Each of the plastic bowls 6 and 7 is again at its front end at an angle α (corresponding to the miter angle α on the metal hollow section 1 Beveled (inclined surfaces 23 and 24 ), as shown in the illustrations of 1 to 3 is shown. 1 finally shows a plastic corner connector 16 , the two in corresponding cavities 17 respectively. 18 of the metal hollow profile 1 insertable in a form-fitting manner, to the metal hollow profile 1 towards projecting slide body 19 . 20 which, at its front end facing the viewer, has an end plate running obliquely under the miter angle α 21 are connected, whose front end surface 22 in the assembled, ie in the metal hollow section 1 inserted state, a front plastic miter surface forms.

The length of the plastic shells 6 and 7 is, relative to the length of the metal hollow profile 1 , so chosen that the front inclined surfaces 22 and 23 the plastic bowls 6 and 7 im with the metal hollow profile 1 assembled state over its front Miter surface 3 protrude on both sides by a length L ( 2 ), which is 2 mm to 20 mm, and if the corner connector 16 until the stop of his end plate 21 against the sloping end surface 3 of the metal hollow profile 1 is inserted, the thickness D of the end plate 21 of the corner connector 16 corresponds to 3 ). Like the representation of the 3 can be seen, it is achieved that the front Schrägflä chen 23 and 24 the plastic plates 6 and 7 in the assembled state in a common plane with the outer surface 22 the end plate 21 of the corner connector 16 lie so that through the inclined surfaces 22 . 23 and 24 a front miter surface lying in a common plane is formed (see 3 ), with the miter surface of another composite profile with inserted corner connector 16 can be welded.

As the 1 and 2 still show, are also on the corner connector 16 on both sides 25 and 26 his end plate 21 each corresponding to the position of the locking webs 8th and 9 respectively. 10 and 11 the lateral plastic shells 6 and 7 arranged side grooves 27 and 28 respectively. 29 and 30 attached, in which the locking webs 8th and 9 such as 10 and 11 when inserting the corner connector 16 in the out of the metal hollow section 1 as well as the two lateral plastic plates 6 and 7 can enter existing composite profile.

The locking bars 8th and 9 such as 10 and 11 and the Rastnuten 12 and 13 such as 14 and 15 each have shapes that are coordinated so that in the mounted state of the plastic shells 6 and 7 to the metal hollow profile 1 by the engagement of the locking projections in the locking grooves a positive and backlash-free attachment of the locking webs 8th . 9 . 10 . 11 in the Rastnuten 12 . 13 . 14 . 15 he follows.

The 4 and 5 now each show a section corresponding to cutting profile AA in 3 in the assembled state of the composite profile according to the invention, wherein in 4 only the plastic shell 7 on the side 5 of the metal hollow profile 1 shown in the assembled and fastened state while the one on the opposite side 4 of the metal hollow profile 1 arranged plastic shell 6 Although also already in the metal hollow profile 1 attached state is shown and their locking webs 8th and 9 already in the Rastnuten 12 and 13 are introduced, there, however, the positive fastening in this has not yet done. How out 4 can be seen, namely for insertion of the locking webs 8th and 9 in each case to the outside of the metal hollow profile 1 lying side walls 31 and 32 the two locking grooves 12 and 13 unfolded towards the outside, in such a way that each of the plastic shell 6 facing insertion opening of the locking grooves 12 and 13 due to the unfolded side walls 31 respectively. 32 so large is that the ridges 8th and 9 when applying the plastic shell 6 against the page 4 of the metal hollow profile 1 unhindered in the Rastnuten 12 . 13 can run into. Then the condition is reached, as in 4 are shown, these trained as Verrastungsnasen side walls 31 and 32 the Rastnuten 12 and 13 z. B. by means of externally applicable (not shown) pressure wheels o.ä. against the facing side of the respective latching web 8th respectively. 9 bent over and there against the obliquely outward side surfaces 33 respectively. 34 the respective thickening at the projecting end of the latching web 8th respectively. 9 pressed. This final assembly position shows 5 , In the presentation of 4 this process has on the opposite side (plastic shell 7 ) already occurred.

In this final assembly position are the plastic shells 6 and 7 over her locking bars 8th . 9 . 10 . 11 firmly in the associated locking grooves 12 . 13 . 14 . 15 of the metal hollow profile 1 held positively and without play, like this 5 shows.

By bending the side walls 31 . 32 the Rastnuten 12 . 13 . 14 . 15 against the facing sides of the applied locking webs 8th . 9 respectively. 10 . 11 and their local pressing against the latter becomes one also in the direction of the longitudinal axis LL of the composite profile (and thus also in the longitudinal direction of the locking grooves 12 . 13 . 14 . 15 ) immovable positional fixation of the locking webs 8th . 9 . 10 . 11 on the metal hollow profile 1 reached.

Like from the 1 to 5 It can be seen that the plastic shells 6 and 7 for double-sided covering of the metal hollow profile 1 of identical shape, so that so that only one form of plastic shell is required, which promotes storage significantly. Of course, there is also the possibility, if desired, different shell shapes on both sides of the metal hollow profile 1 if this is desirable or expedient for any reason. The use of plastic shells with identical shape but should be particularly favorable in most cases.

The plastic bowls 6 . 7 can consist of all suitable weldable plastic materials, in particular hard PVC is very suitable as material to be used.

The plastic bowls 6 and 7 can also be made of a foamed weldable plastic, in which case there is also the additional possibility, for. B. at the metal hollow profile 1 opposite side of each plastic shell 6 respectively. 7 a non-foamed outer skin, preferably made of the same plastic as the foamed material to apply. Since these plastic parts are usually extruded parts, a smooth and non-foamed outer skin could already be applied in the course of coextrusion during production.

Also for the production of the corner connector 16 can be any suitable weldable plastic be used, but here is also hard PVC to mention.

The distance X between the straight lines A and B (corresponding to the distance between the center axes of the latching projections 8th and 9 respectively. 10 and 11 ) is so large that it is at least 80% of the length I ( 5 ) is, along which the respective plastic part 6 respectively. 7 on the metal hollow profile 1 is applied, and at least 2.5 times the length Y, over which the plastic part 6 respectively. 7 over the metal hollow profile 1 out (in the direction perpendicular to the longitudinal axis LL) protrudes.

Regarding the in the 1 and 3 shown corner connector 16 It should be noted that this is shown in the figures only in a principal way to its cultivation on an inventive composite profile, consisting of the metal hollow section 1 and the plastic parts fastened on both sides 6 and 7 to illustrate. Of course, here is a conventional corner connector 16 Any suitable structure can be used, in particular a corner connector with a special construction, in which of the oblique end face 22 the Eckverbinders forth an attachment thereof in the hollow sections of the metal hollow profile 1 can be made by appropriate measures. For this purpose, a variety of constructions for such corner joints to those skilled in the art, which, although of very different structure, usually also for use in a composite profile according to the invention in place of a corner joint with a structure, as in the 1 and 3 shown can be used. The design of the cross-sectional shape of the locking webs 8th to 11 and the Rastnuten 12 to 15 can be chosen in any suitable manner that ensures a play-free positive fastening. It is particularly favorable, however, if the locking webs and the locking grooves each have a complementary, z. Example, have a substantially dovetail-shaped cross-section, as is approximately approximated in the forms shown in the figures.

Claims (13)

Composite profile as a frame piece for windows, doors or the like., With a metal hollow profile ( 1 ), which are on its to the outside and inside of the frame lying profile pages ( 4 . 5 ) each with a planking in the form of a plastic part ( 6 . 7 ), which - viewed in each case in the direction of the longitudinal axis (LL) of the frame piece - at both ends at an angle (α) to the longitudinal axis (LL) inclined inclined surface ( 23 . 24 ), which over the associated end face ( 3 ) of the metal hollow profile ( 1 ), wherein over the entire length of the inclined surface ( 23 . 24 ) of the plastic part ( 6 . 7 ) the shortest projection (L) in the direction of the longitudinal axis (LL) is 2 mm to 20 mm, the oblique surfaces ( 23 . 24 ) of both plastic parts ( 6 . 7 ) are located at each end of the frame piece in a common miter surface, which at the same time to the longitudinal axis (LL) of the frame piece by an equal angle (α) as the inclined surfaces ( 23 . 24 ), furthermore each plastic part ( 6 . 7 ) on integrally formed on him, in corresponding form photographs ( 12 . 13 ; 14 . 15 ) on the metal hollow profile ( 1 ) positively engaging retaining projections ( 8th . 9 ; 10 . 11 ) on the metal hollow profile ( 1 ) is secured without play, and further wherein the support projections ( 8th . 9 ; 10 . 11 ) along at least two to each other and to the longitudinal axis (LL) of the frame piece on the plastic part ( 6 . 7 ) extending straight lines (A, B) are mounted, the distance (X) from each other at least 2.5 times the supernatant (Y) of the associated plastic part ( 6 . 7 ) over the metal hollow profile ( 1 ) - seen in the direction perpendicular to the straight line (A, B) - is. Composite profile according to Claim 1, characterized in that the metal hollow profile ( 1 ) at its two longitudinal ends in each case an end face ( 3 ), which lead to the common miter surface, in which the oblique end surfaces ( 23 . 24 ) of both plastic parts ( 6 . 7 ) lie at the respectively associated end of the frame piece, runs parallel. Composite profile according to claim 1 or 2, characterized in that the support projections in the form of locking webs ( 8th . 9 . 10 . 11 ) are formed. Composite profile according to one of claims 1 to 3, characterized in that the mold receptacles on the metal hollow profile ( 1 ) in the form of locking grooves ( 12 . 13 . 14 . 15 ) are formed. Composite profile according to claim 3 or 4, characterized in that the latching webs ( 8th . 9 . 10 . 11 ) and the locking grooves ( 12 . 13 . 14 . 15 ) each have a substantially dovetail-shaped cross-section. Composite profile according to one of claims 1 to 5, characterized in that the plastic parts ( 6 . 7 ) are formed as plastic shells. Composite profile according to one of claims 1 to 6, characterized in that the plastic parts ( 6 . 7 ) are made of hard PVC. Composite profile according to one of claims 1 to 7, characterized in that the plastic parts ( 6 . 7 ) consist of foamed plastic. Composite profile according to one of claims 1 to 8, characterized in that the plastic parts ( 6 . 7 ) are formed identically. Composite profile according to one of claims 1 to 9, characterized in that the metal hollow profile ( 1 ) made of light metal, in particular aluminum or an aluminum alloy. Composite profile according to one of claims 1 to 10, characterized in that the support projections ( 8th . 9 . 10 . 11 ) in the locking grooves ( 12 . 13 . 14 . 15 ) are fixed immovably in the direction of the longitudinal axis (LL) of the composite profile. Composite profile according to one of claims 1 to 11, characterized in that in the metal hollow profile ( 1 ) at both longitudinal ends of the same in each case a corner connector ( 16 ) is inserted, which at its rear in the insertion direction end an end plate ( 21 ) with one of the inclinations of the inclined surfaces ( 23 . 24 ) of the plastic parts ( 6 . 7 ) according to inclined outer surface ( 22 ), wherein the corner connector ( 16 ) in the inserted state with its end plate ( 21 ) against the facing end surface ( 3 ) of the metal hollow profile ( 1 ), the corner connector ( 16 ) in the metal hollow profile ( 1 ) in the inserted state is blocked and the shortest projection (L) is selected so that in the inserted state, the oblique outer surface ( 22 ) of the corner connector ( 16 ) in the common miter surface of the two inclined surfaces ( 23 . 24 ) of the plastic parts ( 6 . 7 ) lies. Composite profile according to one of Claims 1 to 12, characterized in that the distance (X) between the parallel straight lines (A, B) is at least 80% of the length (I) along which, viewed perpendicular to the straight lines (A, B) , the metal hollow section ( 1 ) on the respective plastic part ( 6 . 7 ) is present.