PART OF A SUPPORT FRAME WITH CORNER CONNECTOR

Description

[0001] The present invention relates to a supporting frame, in particular a part of a supporting frame with at least two mitred hollow profiles with at least one inner chamber and at least one corner connector engaging into the hollow profiles with its legs according to the preamble of claim 1.

[0002] The corner connector can have receptacles for insertable fastening means by means of which the hollow profiles and the corner connector can be connected, wherein the fastening means can be designed as bolts (80) that can be driven into bores of the hollow profiles and into receptacles of the legs of the corner connector and the bolts are positively fixed in at least one of the receptacles through which the bolt extends.

[0003] DE 299 03 649 U1 is known from the prior art, in which a support frame is formed from hollow profiles with corner connectors that are connected by means of a bolt connection. The support frame and the corner connectors are made of metal. This support frame has the significant disadvantage that the holes in the hollow profiles and corner connectors provided for connecting the parts must be perfectly aligned in order to properly drive the bolt through the two parts. However, under normal construction conditions, this means that some subsequent adjustments and corrections must be made to the individual parts in order to ensure a precise fit. In particular, it is necessary to remove material from the ends of the hollow profiles to ensure a precise fit.In addition, torsions in the design must be taken into account during the production of the supporting frame, which for manufacturing reasons can only be corrected by individual adjustment but not by prior calculation.

[0004] Corner connectors with inserted sleeves are disclosed in DE2209682A1 and FR1545527A.

[0005] The present invention has the object of counteracting the disadvantages of the prior art and of providing a reliable connection between corner connectors and hollow profiles of a supporting frame, which overcomes the disadvantages of the prior art.

[0006] According to the present invention, the object is achieved by the characterizing features of claim 1.

[0007] These are that the receptacles are designed as separate / discrete polymer sleeves inserted into the legs of the corner connector, in which at least one recess is provided for the positive reception of the bolts in the leg.

[0008] It is intended that the hollow profiles and the corner connectors are connected in the connected state by means of the bolts under prestress, in that the bores of the hollow profiles and the receptacles of the corner connectors are arranged with a partial offset to one another.

[0009] The polymer sleeves provide the necessary flexibility and elasticity to compensate for any misalignment between the holes in the hollow profiles and the receptacles on the corner connectors, thus avoiding subsequent corrective work on the individual components of the supporting frame. Furthermore, an offset between the holes in the hollow profiles and the elastic receptacles can lead to prestressing between the bolts and the supporting frame parts in the assembled state, which further increases the joint strength.

[0010] According to a preferred development, the polymer sleeve of one leg has two or more recesses for bolts and / or is formed in one piece. On the support frame, the distance between the recesses in the polymer sleeve can be adapted to the distance between the corresponding holes in the hollow profile. The adaptation can include an offset relative to the holes, which compresses or expands the body of the polymer sleeve with prestress when the support frame is connected, whereby the positive connection between the hollow profile and the corner connector by means of the bolt in the polymer sleeve can be supplemented by or replaced by a frictional connection.

[0011] The polymer sleeve can also serve as a spring element between the corner connector and the hollow profile and be provided with a pre-adjustable spring constant / spring force, whereby the requirements of the support frame can be adapted depending on the application. The spring constant or spring effect of the part of a support frame according to the invention can be adjusted both by selecting the polymer, i.e. the intrinsic material-bound spring constant, and by a spring tension of the material of the polymer sleeve by appropriately selecting the spacing of the recesses in relation to the spacing of the holes in the hollow profile. A particularly large offset between the receptacles in the corner connector and the corresponding holes in the hollow profile can pre-strengthen the material of the polymer sleeve in a special way and create and / or increase a frictional connection.The offset between the bore(s) in the hollow profile and the at least one recess in the polymer sleeve can preferably be 0.1 mm to 5 mm.

[0012] For a particularly secure connection of the corner connector to a part (hollow profile) of the supporting frame, the polymer sleeve can be secured in the leg with a positive and / or non-positive fit. The polymer sleeve can be elastic and / or allow displacement of the bolt to compensate for the offset. To improve the positive fixation, the sleeve can be designed with a conical outer contour, wherein a receiving area in the leg of the corner connector for the polymer sleeve approximately corresponds in its inner circumference / inner contour to the outer circumference / outer contour of the polymer sleeve, thereby providing a particularly effective fixation in the direction of the tapered recess in the corner connector.

[0013] According to a preferred embodiment of the present invention, the polymer sleeve is made of polyethylene, polypropylene, polyurethane, or polyacrylonitrile, or a mixture of the aforementioned. The choice of polymer can have a direct influence on the spring constant or the spring action between the corner connector and the hollow profile.

[0014] It can be expediently provided that, in addition to the recesses, defined and / or fillable spaces or recesses, preferably bores or drilled holes, are provided in the polymer sleeve for defining and / or adjusting a desired spring constant or elasticity of the receptacle or the polymer sleeve, in particular as a resilient element. The free spaces or bores can be used to specifically create weak points or particularly yielding areas in the polymer sleeve in at least one spatial direction without sustainably affecting the elasticity in another spatial direction.As a result, for example, the driving of the bolts into the holes in the hollow profiles and the receptacles in the corner connectors can be facilitated by a simplified displacement of the receptacles in the polymer sleeve in one spatial direction, wherein in another spatial direction, for example orthogonal to the first spatial direction and / or orthogonal to an extension direction of the bolts in the normal operating connection state, an increased strength or spring constant of the polymer sleeve can be provided.

[0015] Particularly preferably, the construction height of the corner connector corresponds to the clear height of the inner chamber in the hollow profile.

[0016] According to a practical development of the present invention, a separate inner chamber is provided for each leg of the hollow profile. In principle, two adjacent hollow profiles can be connected via more than one corner connector. If more than one corner connector is provided, it may be expedient to provide the hollow profile with separate inner chambers for each corner connector. The shape of the inner chamber is expediently adapted to each of the corner connectors or their legs.

[0017] It can be expediently provided that at least one polymer sleeve for adjusting a spring constant, e.g., of its receptacle (10), is interchangeably arranged therein. Different polymer sleeves with different elastic properties can thus be provided for adapting the corner connector and its resilient connection properties.

[0018] Particularly preferably, the inner chamber is adapted to the shape of the leg, in particular the inner chamber surrounds the leg in a form-fitting manner.

[0019] The invention is further explained below with reference to the accompanying drawings. The drawings show: Figure 1a perspective view of a holder for two bolts, Figure 2a perspective view of the holder according to Figure 1 with corner connector, Figure 3 a perspective view of the holder and the corner connector according to the Figures 1 and 2 with bolts and Figure 4a perspective exploded view of part of a supporting frame with corner connector, holder and bolts.

[0020] Figure 1shows a receptacle 10 according to the present invention, which can be designed as a polymer sleeve. The receptacle 10 has at least one recess 20, which is designed to receive a connecting bolt for connecting the corner connector and the hollow profile, preferably in a form-fitting manner. Figure 1 The holder is designed with more than one recess to accommodate more than one bolt. Figure 1 the shape of the receptacle 10 can be described as bone-shaped or 8-shaped in cross section.

[0021] The sleeve 10 is preferably designed to extend at least over the length of the bolt to be accommodated and / or preferably to be completely accommodated in the corner connector. To adjust elasticity or deformability, recesses 30 or bores 30 can be provided in the material of the receptacle 10, which can locally influence the spring force or spring constant of the receptacle between the bores 30 and the recess 20.

[0022] A change in the elasticity of the material is influenced particularly along an axis of the recess 20 and bores 30, whereas the elasticity of the material of the receptacle remains largely unaffected in other areas. This allows for targeted, varying elasticity to be provided in different spatial directions transverse to the longitudinal axis of the bolt receptacles 20.

[0023] Figure 2shows the corner connector 50 according to the invention with its legs 60 and recesses 70 in which the receptacles 10 can be arranged. The shape of the recesses 70 is preferably adapted in its inner contour to the outer contour of the receptacle 10, whereby the receptacle 10 can be fixedly secured in the leg 60 of the corner connector 50. According to the present embodiment, two recesses 20 for bolts are provided in each leg 60 of a corner connector 50. In principle, any number of bolts can be provided in corresponding receptacles in each leg. In principle, a single receptacle 10 can also be provided for a plurality of bolts.

[0024] Figure 3 shows an exploded view of corner connector 50 with receptacle 10 and bolt 80 provided therein. In normal operation, the bolt 80 is driven through holes in a hollow profile into the receptacle 10 or its recesses 20.

[0025] Figure 4 shows an exploded view of a part of a support frame according to the invention, in which two corner connectors 60 are provided in corresponding cavities 92 with inner contours preferably adapted to the outer contour of the leg 60 of the corner connector 50. This allows the corner connector to be inserted into the hollow profile 90 in a fixed position, preferably with a positive fit. Bores 91 in the hollow profile 90 are preferably adapted to the spacing of the recesses 20 in the respective receptacle 10.

[0026] The spacing of the holes 91 belonging to a leg 60 of a corner connector 50 may differ slightly from the corresponding spacing of the recesses 20 of the corresponding receptacle 10, meaning the holes may be closer or further apart. When inserting the bolt 80 through the holes 91 into the recesses 20, the polymer material is preferably expanded or compressed along the connecting axis of the two holes 91 for a leg of a corner connector, thereby providing increased frictional engagement for securing the bolts in the part of the supporting frame.

[0027] As in Figure 4As indicated, the receptacles 10 can have an overall conical shape, which tapers towards the interior of the supporting frame part. This ensures that the receptacle 10 remains securely fixed in the leg 60 of the corner connector 70, even when the bolt 80 is driven into the receptacle 10 through the bore 91 with great force. This can counteract any unfavorable displacement of the receptacle 10 deeper into the interior of the corner connector or even out of the corner connector to the opposite side.

[0028] The resulting part of a supporting frame or supporting frame with multiple hollow profiles and interposed corner connectors offers the significant advantage of a flexible connection between each corner connector and hollow profile, as well as between two adjacent hollow profiles. This allows for variances during production to be compensated for, and also prevents adverse deformation of the corner connector or its recesses or the hollow profiles under tension or compression, for example, along the connecting axis of the corner connector and the support / hollow profile.

[0029] The clamping force and strength of the connection can be adjusted by a defined offset of the bores 91 to the corresponding recesses 20 of the holder 10. Connecting two hollow profiles using the corner connector according to the invention has the advantage that the components are at least partially decoupled from each other with respect to the individual tensile and compressive forces on the individual hollow profiles and are at least partially absorbed by the respective polymer body of the holder 10. Such a concept for the simple production of a supporting frame part, which tolerates variations in the manufacturing process and simultaneously provides hollow profile elements that are decoupled from each other in terms of force, is not known from the prior art.

Claims

1. Part of a support frame with at least two hollow profiles (90) cut at a miter with at least one inner chamber (92) and at least one corner connector (50) engaging into the hollow profiles (90) with its legs (60), wherein the corner connector (50) has receptacles (10) for insertable fastening means, by which the hollow profiles (90) and the corner connector (50) can be connected, wherein the fastening means are designed as bolts (80) that can be driven into holes (91) in the hollow profiles (90) and into receptacles (10) of the legs (60) of the corner connector (50), and the bolts (80) are positively fixed in at least one of the receptacles (10) through which the bolt (80) extends characterized in that the receptacles (10) are designed as separate polymer sleeves inserted into the legs (60) of the corner connector (50), in which at least one recess (20) for the positive reception of the bolts (80) is provided in the leg (60), that the hollow profiles and the corner connectors are connected in the connected state by means of the bolts under preload, in that the holes (91) of the hollow profiles (90) and the receptacles (10) of the corner connectors (50) are arranged with a partial offset to each other.

2. Part of a support frame according to claim 1, characterized in that that the polymer sleeve of a leg (60) has two recesses (20) for bolts (80) and is formed in one piece.

3. Part of a support frame according to claim 1 or 2, characterized in that the polymer sleeve is elastic and allows displacement of the bolt to compensate for the offset and / or is positively fixed in the leg (60).

4. Part of a support frame according to any one of claims 1 to 3, characterized in that the distance of the recesses (20) in the polymer sleeve deviates, preferably by 0.1 mm - 5 mm, from the distance of the corresponding holes (91) in the hollow profile (90), i.e. is offset.

5. Part of a support frame according to any one of claims 1 to 4, characterized in that the polymer sleeve is formed from polyethylene, polypropylene, polyurethane, polyacrylonitrile or a mixture of the aforementioned.

6. Part of a support frame according to any one of claims 1 to 5, characterized in that in the polymer sleeve, in addition to the recesses (20), defined foreseeable and / or fillable spaces or cavities, preferably holes or drilling points, are provided to define and / or adjust a desired spring constant or elasticity of the receptacle or the polymer sleeve, particularly as a spring element.

7. Part of a support frame according to any one of claims 1 to 6, characterized in that an outer contour of the polymer sleeve is designed conically.

8. Part of a support frame according to any one of claims 1 to 7, characterized in that the height of the corner connector (50) corresponds to the clear height of the inner chambers (92).

9. Part of a support frame according to any one of claims 1 to 8, characterized in that a separate inner chamber (92) is provided for each leg (60) on the hollow profile (90).

10. Part of a support frame according to any one of claims 1 to 9, characterized in that at least one polymer sleeve for adjusting a spring constant of its receptacle (10) is arranged exchangeably in it.