EP2500478B1 - Connection means with a connector head - Google Patents

Description

The invention relates to a connecting means with a connecting head according to the type specified in the preamble of claim 1.

Such connecting means are known in different designs and serve to connect a component to another component or to attach a component to a fixed structure. For this purpose, the connecting means on a connection head, which is provided with a support surface. This bearing surface is in the assembled state directly or indirectly to the component. About this connection head, the force for the activation of the connecting means, in particular by means of a tool introduced. If, for example, the connecting means is designed in the form of a screw, the tool is attached to the connecting head and the screw is screwed into a solid structure for connecting a component in, for example, a threaded bore. The screw in this case has an external thread, but are also conceivable other connecting body having other radially applied projections or other applied projection than the external thread. About the projection or the projections anchoring in another body, for example, the support structure is then possible. As a rule, the connection head and the connection body are formed integrally with the same material. The screw usually passes through the component to be fastened to the support structure and the screw head presses this component indirectly, e.g. using a washer, or directly against the support structure.

The problem with such connecting means is that it comes in the assembled state to heat / cold bridges, in particular when the connecting means passes through a thermal insulation and a body is to be arranged on the thermal insulation. This is the case for example in houses, which are thermally insulated and on the outer facade canopies, awning fastenings, railings and the like are fastened with connecting means, which then engage in the solid support structure of the house in the form of masonry.

Fischer sells a system under the name "Thermax" for this purpose. In this case, a connecting means is introduced in the form of a screw in an injection-molded plastic from one side and from the other side a connecting means in the form of a threaded rod. Both connecting means are thermally decoupled from each other by the injection molding plastic. A detachable sleeve presses the injection-molded plastic in each case onto the part of the connecting body of the connecting means introduced into the injection-molded plastic. As a result, a detachable unit of two connecting means is provided, which can also be disassembled again and is fixed by the sleeve in an assembled state.

This embodiment has the disadvantage that it is very expensive to manufacture and in the assembly. Many parts need to be connected together to make a connection. Moreover, it is possible that in the event of a failure of the sleeve and a breakage of the injection-molded plastic, the one connecting means can no longer be deactivated, ie dismantled, without further ado. The stability of the connection is no longer given.

From the DE 102 49 993 A1 and the DE 203 20 600 U1 In each case, a generic connection means with connection head emerges, which has a contact surface for direct or indirect contact with a first body. In this case, a force for activating the connection means, in particular with a tool, is introduced via the connection head. A connecting body is formed with projecting from this connecting body radially projection or projections for anchoring in at least one second body. The connection head is fixedly connected to the connecting body via an insulating body and thermally decoupled from each other by the insulating body. Here, the insulating body is firmly connected to the connecting head and the connecting body, whereby a power transmission for activating the connecting means between the connecting head and connecting body is made possible.

From the DE 201 07 906 U1 is a façade anchor for fastening and anchoring loads on facades of thermal composite systems, which has an insulating material made of rigid polyurethane foam.

The invention has the object of providing a connecting means according to the type specified in the preamble of claim 1 further such that while avoiding the disadvantages mentioned a simple assembly and disassembly is possible. In particular, this should also be possible with damage to the element, which ensures the thermal decoupling.

This object is solved by the characterizing features of claim 1 in conjunction with its preamble features.

The invention is based on the finding that a thermally decoupled connection means is provided from the outset, in which the connecting head facing a body on one side and the connecting body engaging in another body are thermally decoupled from each other and form an insoluble structural unit. The thermal decoupling takes place by an insulating body, wherein stop means are provided which allow assembly, disassembly and maintain the connection when the insulating body is damaged.

A problem for the strength of the connecting means according to the invention may be the insulating body in certain applications, because this usually has lower strength values than the connecting head or the connecting body. In addition, this is more susceptible to environmental influences.

According to the invention therefore effective auxiliary stop means are provided in the insulating body, which are spaced from each other, wherein in each case an auxiliary stop means with the connecting head and another auxiliary stop means is connected to the connecting body and only upon damage of the insulating body and to move towards each other due to an applied force the Auxiliary stop means to each other to the plant come and take effect. The insulating body is in the connecting means is a weak point, which can come due to overuse but also by environmental influences, such as sunlight and the resulting aging of the material to damage the insulating body. In order to still ensure the connection, the auxiliary stop means are provided. In a simple way can be maintained by the auxiliary stop means and damage to the insulating body, the connection function and carried out an assembly and disassembly.

According to an advantageous embodiment of the invention, at least in a longitudinal direction of the connecting means effective first auxiliary stop means are provided in Dämmkörpern which are spaced from each other, wherein in each case a first auxiliary stop means with the connecting head and a further first auxiliary stop means is connected to the connecting body and only when damaging the insulating body and move towards each other due to an applied force, the first auxiliary stop means to each other to the plant and take effect. In this way is achieved in a simple manner, that in case of damage of the insulating body, the connecting means as such remains werkisam remains. Furthermore, force can be transmitted from the connection head to the connection body at least in a longitudinal direction. Preferably, the first auxiliary stop means are effective in both longitudinal directions of the connection means so as to be able to transmit force in both directions.

Should an insulating body of a fastener be damaged, it is equally important to exchange this fastener again and replace it with an intact fastener. However, in order to achieve that the connecting body can be moved out of the other body again, according to a further embodiment of the invention, at least in a rotational direction relative to a rotational axis of the connecting means effective second auxiliary stop means provided in the insulating body, which are spaced from each other, wherein in each case a second auxiliary stop means with the connecting head and a second auxiliary stop means is connected to the connecting body and only upon damage of the insulating body and move towards each other due to an applied torque, the second auxiliary stop means come into contact and take effect. In this way it is ensured that the connecting means can be disassembled in any case, even if the insulating body is damaged.

Preferably, the axis of rotation is formed by the longitudinal axis of the connecting body and / or connecting means. In order to ensure the best possible power transmission in the undamaged and damaged state of the insulating body, the stop means in the body are designed so that the largest possible surface is given for mutual contact. For example, for the transmission of torques, a coiled, stepped and / or meandering design of the auxiliary stop means is advantageous. For certain applications, it is advantageous if the insulating body is formed fireproof.

The insulating body may be a foam, which is provided with gas inclusions in each case a cavity, in particular polyurethane foam include, preferably, this may be formed as a highly insulating Dämmkörper.

In order to expand the scope of the connection means, the connection head is connected to other components or is connectable, for example a plate.

According to one embodiment of the invention, the connecting means is designed so that an activation by screwing, wrapping, gluing, locking, riveting, friction welding, jamming and / or the like is made possible.

Preferably, the connecting body and the connecting head made of metallic material, in particular, both parts may be formed of the same material or of different materials.

The material of the insulating body can come in terms of the desired load to its limits. According to one embodiment of the invention, therefore, at least thermally or thermally and electrically inferior or thermally or thermally and electrically nonconductive materials may be introduced in areas where in use spikes occur, such as carbon fiber posts, fiberglass profiles, ceramics, glass, silicone and the like , The insulating body thus comprises such insulating reinforcements as well as an insulating material.

According to an advantageous embodiment of the invention, this is designed as a screw, wherein the connecting head is formed by a screw head and the connecting body by a threaded body. The threaded body may have a self-tapping thread and / or be provided with a self-drilling tip. In addition, the threaded body can be provided with a, in particular centric, bore with internal thread and / or with an external thread.

Further advantages, features and possible applications of the present invention will become apparent from the following description in conjunction with the embodiments illustrated in the drawings.

Fig. 1

eine schematische Seitenansicht, einer ersten Ausführungsform eines Verbindungsmittels nach der Erfindung;

Fig. 2

eine Draufsicht, auf die Ausführungsform von Fig. 1;

Fig. 3

eine Querschnittsansicht, entsprechend der Linie A-A von Fig. 2;

Fig. 4

eine weitere Querschnittsansicht, entsprechend der Schnittlinie B-B von Fig. 3;

Fig. 5

eine Schnittansicht, entlang der Linie A1-A1 von Fig. 2;

Fig. 6

eine weitere Schnittansicht, entlang der Schnittlinie C-C von Fig. 5;

Fig. 7

eine schematische Seitenansicht, einer weiteren Ausführungsform der Erfindung;

Fig. 8

eine Draufsicht, auf die Ausführung von Fig. 7, und

Fig. 9

eine Schnittansicht, entlang der Linie A-A von Fig. 8.

In the description, the claims, and the drawing, the terms and associated reference numerals used in the list of reference numerals below are used. In the drawing:

Fig. 1

a schematic side view of a first embodiment of a connecting means according to the invention;

Fig. 2

a plan view of the embodiment of Fig. 1 ;

Fig. 3

a cross-sectional view, corresponding to the line AA of Fig. 2 ;

Fig. 4

another cross-sectional view, corresponding to the section line BB of Fig. 3 ;

Fig. 5

a sectional view taken along the line A1-A1 of Fig. 2 ;

Fig. 6

another sectional view, along the section line CC of Fig. 5 ;

Fig. 7

a schematic side view of another embodiment of the invention;

Fig. 8

a plan view of the execution of Fig. 7 , and

Fig. 9

a sectional view taken along the line AA of Fig. 8 ,

In the Fig. 1 to 6 a first embodiment of a connecting means in the form of a screw 10 is shown. The screw 10 consists of a threaded body 12 and a screw head 14. The threaded body 12 and the screw head 14 are connected via an insulating body 16 with each other. The screw head 14 is formed as a hexagon. About the screw head 14, the screw 10 is rotated by means of a wrench into a correspondingly stepped bore in and out. In this case, the threaded body 12 engages with its self-drilling tip 18 in a support structure, such as a house wall or the like. In a second bore, which is arranged concentrically to the first bore in the support structure, engages the insulating body 16 of the screw 10 a. The underside of the screw head 14 has a support surface 20. About the support surface 20, a component to be fixed is pressed against the support structure and thus fixed. In this case, the screw 10 engages with the insulating body 16 and the threaded body 12, the component and engages in the support structure.

As in particular the Fig. 3 to 6 it can be seen, the screw head 14 is provided with a cylindrical pin 22 to which a first transverse plate 24 is attached. The cylindrical pin 22 projects into the insulating body 16, extends concentrically to the longitudinal axis 26 of the screw 10. The first transverse plate 24 extends transversely to the longitudinal axis 26 of the screw 10. On the transverse plate 24, a first stop ring 28 is attached. This first stop ring 28 passes through a second stop ring 30, which is fixedly connected to a second transverse plate 32. The second transverse plate 32 is fixedly connected to the threaded body 12. The first and second stop ring 28, 30 pass through each other so that they do not touch. In addition, there is no contact with other opposing parts of the screw head 14 and threaded body 12. This ensures that the screw head 14 is thermally decoupled from the threaded body 12 via the insulating body 16. However, should the insulating body 16 be destroyed by mechanical overstress, the screw 10 may continue to be actuated, namely the screw 10 in a supporting structure in or out to be rotated. This is ensured by the interlocking first and second stop rings 28, 30. In the normal state, the intermediate spaces are all filled with the material of the insulating body. This consists for example of rigid polyurethane foam. But it can also consist of other foams with gas inclusions. Even have the quality "high insulation".

By the first and second transverse plate 24, 32 and by the construction of the first and second stop ring 28, 30, a large surface is created, against which the material of the insulating body 16. This serves both to increase the strength of the screw 10 in total but also to better transfer the forces of the screw head 14 on the threaded body 12 and vice versa.

In the Fig. 7 to 9 is shown a further embodiment of the invention, however, for the same parts, the same reference numerals as in the first embodiment are used. The screw head 14 of the screw 10 according to the Fig. 7 to 9 In the present case, not the screw head 14 acts directly on the other component, but the insulating body 16. The screw head 14 acts on the insulating body 16 on the other, not shown here component. The threaded body 12 passes through the further component and is anchored in a solid support structure. The insulating body 16 presses against the surface of the further component and above against the support structure via the screw head 14.

The screw head 14 is octagonal, so that the screw 10 can be actuated via a correspondingly formed wrench. In order to be able to optimally transfer the forces of the insulating body 16 to the further component, a plastic ring 36 is introduced below the second transverse plate 32. The plastic ring 36 is formed correspondingly engages spaced around the threaded body 12 and has a lateral extent corresponding to the second transverse plate 32 and is arranged concentrically to the longitudinal side 26. The plastic ring 36 terminates at its tip 18 of the threaded body 12 facing side flush with the insulating body 16. The screw 10 is formed as a rotationally symmetrical part in the region of the insulating body 16 with the exception of the two stop rings 28, 30.

The stop rings 28, 30 have a rectangular cross-sectional shape and are fixedly connected to the respective associated transverse plate 24, 32. Between the stop rings 28, 30 and the transverse plates 24, 32 stabilizing elements 34 are introduced, which are not directly connected to the stop ring 24, 32 or the transverse plate 24, 32, but are held by the material of the insulating body 16 in position. Depending on the design and arrangement, the stabilizing elements 34 increase the compressive strength and / or tensile strength of the insulating body 16.

The stabilizing element 34 consists at least of thermally or thermally and electrically minderleitendem or thermally or thermally and electrically non-conductive material, such as carbon fiber pencils, fiberglass profiles, ceramics, glass, silicone and the like. The insulating body 16 thus includes such insulating reinforcements in the form of stabilizing elements 34 as well as an insulating material. From a corresponding material and the plastic ring may be formed.

The screw head 14, the cylindrical pin 22, the first transverse plate 24 and the first stop ring 28 are integrally formed of the same material. The same applies to the second stop ring 30, the second transverse plate 32 and the threaded body 12. In this case, the same materials, in particular metal, have been used for both parts. It is also possible to use different materials, in particular with regard to the strength, thermal conductivity u. ä.

The screw head 14 of both embodiments has a threaded bore 38. About the threaded bore 38 of the screw head 14 can be connected to other elements and components.

The stop ring 28 and 30 serve both as a stop in the direction of the longitudinal axis 26 and as a stop in a rotational movement towards each other. This is important to maintain the function of the screw 10 even with such damage to the insulating body 16 when the insulating body can no longer transmit forces in the longitudinal direction and / or in the direction of rotation.

LIST OF REFERENCE NUMBERS

10

screw

12

threaded body

14

screw head

16

insulating body

18

self-drilling tip

20

bearing surface

22

straight pin

24

first transverse plate

26

longitudinal axis

28

first stop ring = first auxiliary stop means

30

second stop ring = second auxiliary stop means

32

second transverse plate

34

stabilizing element

36

Plastic body

38

Threaded hole in the screw head

Claims (15)

1. Fastening means (10) with a fastening head (14) which has a contact surface (20) for direct or indirect surface contact with a first body, which fastening head (14) can be used to introduce a force for activating said fastening means (10), in particular by means of a tool, and with a fastening body (12) which has one or plural projection(s) which protrude radially from said fastening body (12) and are used for anchoring it in at least a second body, said fastening head (14) and said fastening body (12) being thermally decoupled from each other by an insulating body (16), said insulating body (16) being permanently attached to said fastening head (14) and said fastening body (12) and allowing the transmission of force between said fastening head (14) and said fastening body (12) for activating said fastening means (10) characterized in that operative auxiliary connecting means (28, 30) are provided within said insulating body (16) which are spaced from each other, of which one auxiliary connecting means (28, 30) is connected to said fastening head (14) and another auxiliary connecting means (28, 30) is connected to said fastening body (12), which auxiliary connecting means (28, 30) will only contact each other and become operative after the insulating body (16) has been damaged and the auxiliary connecting means (28, 30) are urged toward each other owing to the application of a force.
2. The fastening means (10) of claim 1 characterized in that operative first auxiliary connecting means (28) are provided within said insulating body (16) in at least one axial direction of said fastening means (10).
3. The fastening means (10) of claims 1 or 2 characterized in that operative second auxiliary connecting means (28) are provided within said insulating body (16) in at least one direction of rotation relative to an axis of rotation of said fastening means (10).
4. The fastening means (10) of claim 3 characterized in that the axis of rotation is constituted by the longitudinal axis of said fastening body (12).
5. The fastening means (10) of one of the preceding claims characterized in that said auxiliary connecting means (28, 30) within said insulating body (16) are of a design which will yield an as large as possible surface for their mutual contact, preferably by means of a spiralling, stepped and/or meander-shaped form of said auxiliary connecting means (28, 30).
6. The fastening means (10) of one of the preceding claims characterized in that said fastening head (14) and said fastening body (12) are of a fireproof design.
7. The fastening means (10) of one of the preceding claims characterized in that said insulating body (16) comprises a foamed material with cavities in which gas is entrapped, in particular rigid polyurethane foam.
8. The fastening means (10) of one of the preceding claims characterized in that said fastening head (14) is connected or adapted to be connected to further components.
9. The fastening means (10) of one of the preceding claims characterized by a design which allows it to be activated by a screwing, driving, gluing, interlocking, riveting, friction welding, clamping step and/or the like.
10. The fastening means (10) of one of the preceding claims characterized in that said fastening body (12) and said fastening head (14) are made of a metallic material, in particular of the same material or of different materials.
11. The fastening means (10) of one of the preceding claims characterized by a design in the form of a screw (10) in which the fastening head (14) is constituted by a screw head (14) and the fastening body (12) is constituted by a threaded body (12).
12. The fastening means (10) of claim 11 characterized in that said fastening head (14) includes a self-tapping thread.
13. The fastening means (10) of claims 11 or 12 characterized in that said fastening body (12) includes a self-drilling tip (18).
14. The fastening means (10) of one of claims 11 to 13 characterized in that said fastening body (12) includes at least one female threaded bore which constitutes said projection.
15. The fastening means (10) of one of claims 11 to 14 characterized in that said fastening body (12) includes a male thread which constitutes said projection.

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