Panel-fastening system

Abstract

A panel-fastening system (1) comprises a fibre cement panel (2) with a visible side (3), which is provided with a coating (4), a rear side (5) and at least one aperture (6), which extends completely through the fibre cement panel (2) from the visible side (3) to the rear side (2); at least one fastening element (7) with a shank portion (8) and a head portion (9), the outside diameter (D9) of which is larger than the outside diameter (D8) of the shank portion (8); and at least one washer (10) with a front side (11), a rear side (12) and a central opening (13), wherein the washer (10) is oriented with the rear side (12) towards the visible side (3) and is oriented with the front side (11) towards the head portion (9), wherein the fastening element (7) projects by way of the shank portion (8) through the aperture (6) and the central opening (13), characterized in that the washer (10) is made of polytetrafluoroethylene at least in the contact region between the visible side (3) and the rear side (12); and in that the thickness (X) of the washer (10) from the front side (11) to the rear side (12) is in the range from 0.2 to 1.2 millimetres, in particular in the range from 0.2 to 1.0 millimetre.

Description

[0001] TITLE

[0002] PLATE FASTENING SYSTEM

[0003] TECHNICAL FIELD

[0004] The present invention relates to a panel fastening system according to claim 1 and a method for assembling a panel fastening system according to claim 15.

[0005] STATE OF THE ART

[0006] Coated facade panels have become known from the prior art. For example, the applicant itself has been selling fiber cement panels with a coating for many years. These fiber cement panels are attached to substructures with screws or rivets, with a head portion of the screw or rivet resting on the panel surface. Weather influences, such as wind, temperature changes, etc., can cause slight displacement between the fiber cement panel and the head portion. This can cause the coating to tear and be scraped away in the area of ​​the head portion. This damage is technically harmless but represents an aesthetic defect.

[0007] PRESENTATION OF THE INVENTION

[0008] Based on this prior art, the invention is based on the object of providing a panel fastening system which prevents the damage described and in particular also meets aesthetic requirements.

[0009] These and other objects are achieved by the subject matter according to claim 1. Accordingly, a panel fastening system comprises

[0010] - a fibre cement board with a visible side provided with a coating and with a rear side and with at least one opening extending completely through the fibre cement board and the coating, - at least one fastening element with a shaft section and a head section, the outer diameter of which is larger than the outer diameter of the shaft section, and

[0011] - at least one washer with a front and a back, as well as with a central opening.

[0012] The washer is oriented with the back facing the visible side. Furthermore, the washer is oriented with the front facing the head section. The fastener protrudes with the shaft section through the cutout and the central opening. The washer is made of polytetrafluoroethylene at least in the contact area between the visible side and the back, or at least the back of the washer is made of polytetrafluoroethylene and the thickness of the washer from the front to the back is in the range of 0.2 to 1.2 millimeters, in particular in the range of 0.2 to 1.0 millimeters.

[0013] The thickness of the washer is particularly preferably in the range of 0.4 to 0.6 millimeters, in particular 0.5 millimeters.

[0014] Choosing a washer with this thickness has the advantage of simultaneously protecting the coating by providing a polytetrafluoroethylene structure in the contact area, while achieving an aesthetically pleasing appearance. In particular, the washer, with a maximum thickness of 1.2, 1.0, or 0.6, results in only minor changes in the height of the head section relative to the visible side compared to a structure without a washer. This allows for an aesthetically pleasing appearance, particularly compared to solutions known from the prior art.

[0015] Furthermore, it was found that the damage described can be successfully avoided despite the small thickness of the washer.

[0016] In one embodiment, the washer is made entirely of polytetrafluoroethylene. This design has the advantage that the washer can be manufactured cost-effectively, for example, by injection molding or stamping.

[0017] The washer preferably has a hardness of 50 to 72 Shore D, in particular 50 to 65 Shore D, and particularly preferably 55 Shore D. Choosing this hardness has the advantage that the washer is inherently stable and does not deform when the fastening element is tightened, in particular, it does not flow into the opening.

[0018] In an alternative embodiment, the washer has a core that is not made of polytetrafluoroethylene. The core is coated externally with a polytetrafluoroethylene coating, at least in the contact area. However, the core can also be completely encased in the polytetrafluoroethylene coating. The polytetrafluoroethylene coating can have the Shore D hardness described above.

[0019] This alternative embodiment has the advantage that, for example, a core can be made of a material that is harder than polytetrafluoroethylene. Thus, the advantages of polytetrafluoroethylene can be utilized while, at the same time, fulfilling an additional function, for example, the stability of the washer can be increased by providing a corresponding core.

[0020] In the following, further optional features are described which can be used equally for all embodiments.

[0021] Preferably, the washer does not extend into the opening, but rests essentially flat or exclusively flat on the visible side. In other words, the washer rests flat on the visible side and extends away from the visible side exclusively toward the front.

[0022] Preferably, the front and back sides run parallel to each other and no parts of the washer extend beyond a plane spanned by the front and / or the back side.

[0023] Preferably, the back of the washer rests on the visible side and the washer extends exclusively forwards from the visible side.

[0024] Preferably, the washer is positioned on the visible side in such a way that it lies completely on and in front of the visible side. As mentioned, no areas, sections, or parts of the washer extend into the opening. The outer shape of the washer is preferably defined by a circular cylinder.

[0025] The coating on the visible side of the fiber cement board is preferably an acrylic coating, a polyurethane coating, or a UV coating. Coatings on the visible side of the fiber cement board can be cured, for example, by UV light, drying, especially at elevated temperatures, or chemically, especially in the case of a two-component coating. The coatings can also contain pigments. The coatings are applied as aqueous dispersions or emulsions or as 100% UV systems.

[0026] The use of a washer made of polytetrafluoroethylene has the advantage in general and particularly with regard to the coatings mentioned that polytetrafluoroethylene is an inert material which practically does not interact, such as sticking, with the coating materials mentioned above or with other materials.

[0027] In one variant, the outer diameter of the washer is smaller than the outer diameter of the head section; in particular, the outer diameter of the washer is 5% to 20%, in particular 5% to 15%, and particularly preferably 6% to 10% smaller than the outer diameter of the head section. Accordingly, the washer does not protrude laterally beyond the edge of the head section, thus reducing the washer's exposure to the elements.

[0028] In another variant, the outer diameter of the washer is larger than the outer diameter of the head section, in particular, the outer diameter of the washer is 5% to 20%, especially 5% to 15%, larger than the outer diameter of the head section. Thus, the washer protrudes laterally beyond the edge of the head section, which exposes the washer to the weather in the protruding area, but prevents a gap from forming between the head section and the visible side where dirt could accumulate.

[0029] In another variant, the outer diameter of the washer is equal to the outer diameter of the head section.

[0030] Preferably, the outer diameter of the head portion is in the range of 14 to 20 millimeters and the outer diameter of the washer is in the range of 12 to 18 millimeters.

[0031] Preferably, the area of ​​the front and the area of ​​the rear are at least 35 square millimeters, in particular at least 40 square millimeters. The area of ​​the front and rear is the effective annular area.

[0032] Preferably, the surface on the head portion against which the front side of the washer rests is designed as a flat surface.

[0033] Preferably, the flat surface extends radially outward from the shaft portion. Preferably, the flat surface extends outward from the shaft portion at a right angle.

[0034] In a preferred variant, the head section, when installed, is located at a distance from the visible side that corresponds to the thickness of the washer, such that the washer rests with its back on the visible side and its front side is in contact with the head section. This represents a play-free installation of the washer, which cannot move towards the shaft section of the fastening element when installed. Play-free installation has the advantage that the washer is firmly clamped between the visible side and the head section. The clamping is such that no or only slight contact pressure results.

[0035] In another preferred variant, the head section, in the assembled state, is located at a distance from the visible side that is greater than the thickness of the washer, such that the washer either rests with its rear side on the visible side or its front side is in contact with the head section. This involves a washer assembly with play, which can move in the direction of the shaft section of the fastening element. The play, viewed in the direction of the shaft axis, is preferably in the range of 0.05 to 0.3 millimeters, in particular from 0.08 to 0.2 millimeters. This play has the advantage that dimensional changes due to heat radiation can be absorbed.

[0036] On a fiber cement board, it is conceivable that some of the fasteners are installed according to the first variant without play, while others are installed according to the second variant with play. Preferably, there is no play between the central opening and the shaft section; or there is a maximum play of 0.2 millimeters between the central opening and the shaft section. The presence of no play or the aforementioned very small play improves the stability of the washer.

[0037] In one embodiment, the shaft portion is designed as a rivet portion, and the head portion is designed as a rivet head. In another embodiment, the shaft portion is designed as a threaded portion, and the head portion is designed as a screw head.

[0038] The washer can be designed separately from the fastener. Alternatively, it is also conceivable for the washer to be pre-assembled to the fastener.

[0039] A method for assembling a panel fastening system as described above is characterized in that in a first step the fiber cement panel is placed on a substructure, in a further step the washer is placed, and in a further step the fastening element is guided with the shaft section first through the central opening and through the opening to the substructure, and in a further step the fastening element is firmly mounted.

[0040] A method for assembling a panel fastening system according to the above description is characterized in that in a first step the fiber cement panel is placed on a substructure, in a further step the combination of washer and fastening element is guided with the shaft section first through the opening to the substructure, and in a further step the fastening element is firmly mounted.

[0041] In both variants of the process, the fastening element is mounted either with or without play during the fixed installation, as mentioned above.

[0042] Further embodiments are specified in the dependent claims.

[0043] BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Preferred embodiments of the invention are described below with reference to the drawings, which are for illustrative purposes only and are not to be construed as limiting. In the drawings:

[0045] Fig. 1 is a partial sectional view of a panel fastening system according to a first embodiment of the present invention;

[0046] Fig. 2 is a detailed view of Figure 1;

[0047] Fig. 3 is a partial sectional view of a panel fastening system according to a second embodiment of the present invention; and

[0048] Fig. 4 is a detailed view of Figure 3.

[0049] DESCRIPTION OF PREFERRED EMBODIMENTS

[0050] The figures show a panel fastening system 1. The panel fastening system 1 comprises a fiber cement panel 2, at least one fastening element 7, and a washer 10 for each fastening element 7. The fiber cement panel 2 is fastened to a substructure U with the fastening element 7. Typically, several fastening elements 7 and thus also several washers 10 are arranged or used.

[0051] The fiber cement board 1 has a visible side 3, which is provided with a coating 4, and a rear side 5 as well as at least one opening 6. The opening 6 extends from the visible side 3 to the rear side 5 completely through the fiber cement board 2.

[0052] A fastening element 7 is arranged in each opening 6.

[0053] The fastening element 7 comprises a shaft section 8 and a head section 9, the outer diameter D9 of which is larger than the outer diameter D8 of the shaft section 8.

[0054] In the first embodiment of Figures 1 and 2, the shaft portion 8 is designed as a threaded portion 14, and the head portion 9 is designed as a screw head 15. Between the threaded portion 14 and the screw head 15 is a connecting portion 16, which is cylindrical and connects the threaded portion 14 to the screw head 15. In other variants, it is also conceivable for the threaded portion 14 to be directly connected to the screw head 15. The threaded portion 14 is screwed into the substructure U.

[0055] In the second embodiment of Figures 3 and 4, the shaft portion 8 is designed as a rivet portion 17, and the head portion 9 is designed as a rivet head 18. The shaft portion 8 projects into an opening in the substructure and is deformed during riveting, forming a bead 19 that is larger than the cross-section of the opening in the substructure, such that the rivet portion 17 can no longer be pulled out of the opening.

[0056] The at least one washer 10 has a front side 11 and a back side 12, as well as a central opening 13. The washer 10 is oriented with the back side 12 towards the visible side 5 and with the front side 11 towards the head section 9. The fastening element 7 protrudes with the shaft section 8 through the opening 6 and the central opening 13. Depending on the distance between the head section 9 and the visible side 5 and the thickness of the washer 10, the washer is mounted with or without play in the direction of the central axis of the shaft section 8. With play-free mounting, the head section 9 is at a distance from the visible side in the mounted state which corresponds to the thickness of the washer 10, such that the washer 10 rests with its back side 12 on the visible side 5 and its front side 11 is in contact with the head section 9.When mounted with play, the head section is at a distance from the visible side 5 in the mounted state, which is greater than the thickness of the washer 10, such that the washer 10 either rests with its rear side 12 on the visible side 5 or is in contact with the head section 9 with its front side 11.

[0057] The washer 10 is made of polytetrafluoroethylene, at least in the contact area between the visible side 3 and the back side 12. In one variant, the washer 10 is made entirely of polytetrafluoroethylene. In another variant, the washer 10 has a core that is not made of polytetrafluoroethylene, and the core is coated externally with a coating of polytetrafluoroethylene, at least in said contact area. The coating is arranged at least such that said contact area of ​​the washer is coated with polytetrafluoroethylene.

[0058] The thickness X of the washer 10 from the front side 11 to the rear side 12 is in the range of 0.2 to 1.2 millimeters, in particular in the range of 0.2 to 1.0 millimeters. The thickness of the washer 10 is particularly preferably in the range of 0.4 to 0.6 millimeters, in particular 0.5 millimeters.

[0059] The washer 10 has a hardness in the range of 50 to 72 Shore D or 50 to 65 Shore D. 55 Shore D is particularly preferred. The selection of this hardness has the advantage that the washer 10 is resistant to the forces generated when tightening the fastening element 7, which do not cause deformation of the fastening element 7.

[0060] The coating on the visible side 3 of the fiber cement board is an acrylic coating or a polyurethane coating.

[0061] In the embodiments shown in the figures, the outer diameter D10 of the washer 10 is smaller than the outer diameter D9 of the head portion 9. Preferably, the outer diameter D10 of the washer 10 is 5% to 20%, in particular 5% to 15%, smaller than the outer diameter D9 of the head portion 9. Particularly preferably, the outer diameter D10 of the washer 10 is 6% to 10%, in particular 7%, smaller than the outer diameter D9 of the head portion 9. In other embodiments, the outer diameter of the head portion can also be smaller than the outer diameter of the washer. A design of the same size is also conceivable.

[0062] The outer diameter D9 of the head section 9 is in the range of 14 to 20 millimeters, and the outer diameter D10 of the washer 10 is in the range of 12 to 18 millimeters. Preferably, the outer diameters are dimensioned such that the above conditions regarding the size relationship of the outer diameters are met.

[0063] Preferably, the area of ​​the front side 11 and the area of ​​the rear side 12 are at least 35 square millimeters, in particular at least 40 square millimeters. The area of ​​the front side 11 and the area of ​​the rear side 12 are the same size. Furthermore, the front side 11 and the rear side 12 run parallel to each other, and no parts of the washer 10 extend beyond a plane spanned by the front side 11 and / or the rear side 12.

[0064] The surface on the head portion 9, against which the front side 11 of the washer 10 rests, is designed as a flat surface. The flat surface extends radially outward from the shaft portion. In particular, the flat surface is at a right angle to the shaft portion. The flat surface is, in particular, an annular surface.

[0065] Preferably, there is no play between the central opening 13 and the shaft section 8. Alternatively, there is a maximum play of 0.2 millimeters between the central opening 13 and the shaft section 8.

[0066] A method for assembling a panel fastening system 1 according to the above description is characterized in that in a first step the fiber cement panel 2 is placed on a substructure U, in a further step the washer 10 is placed, and in a further step the fastening element 7 is guided with the shaft section 8 first through the central opening 13 and through the opening 6 to the substructure, and in a further step the fastening element 7 is firmly mounted.

[0067] An alternative method for assembling a panel fastening system 1 according to the above description is characterized in that, in a first step, the fiber cement panel 2 is placed on a substructure, in a further step, the combination of washer 10 and fastening element 7 is guided with the shaft portion 8 first through the opening 6 to the substructure, and in a further step, the fastening element 7 is firmly mounted. LIST OF REFERENCE SYMBOLS

[0068] 1 Panel fixing system 2 Fiber cement board

[0069] 3 Visible side

[0070] 4 Coating 5 Back

[0071] 6 Opening 7 Fastening element

[0072] 8 Shaft section 9 Head section

[0073] 10 Washer

[0074] 11 Front 12 Back

[0075] 13 central opening 14 threaded section

[0076] 15 Screw head 16 Connecting section

[0077] 17 Rivet section 18 Rivet head U Substructure D8 Outer diameter D9 Outer diameter D10 Outer diameter

[0078] X thickness

Claims

PATENT CLAIMS 1. A panel fastening system (1) comprising a fiber cement panel (2) with a visible side (3) provided with a coating (4), a rear side (5) and at least one opening (6) extending completely through the fiber cement panel (2) and the coating (4), at least one fastening element (7) with a shaft section (8) and a head section (9), the outer diameter (D9) of which is greater than the outer diameter (D8) of the shaft section (8), and at least one washer (10) with a front side (11) and a rear side (12), and a central opening (13), wherein the washer (10) is oriented with the rear side (12) toward the visible side (5) and with the front side (11) toward the head section (9), wherein the fastening element (7) with the shaft section (8) projects through the opening (6) and the central opening (13), characterized in thatthat the washer (10) is made of polytetrafluoroethylene at least in the contact area between the visible side (3) and the back side (12), or that at least the back side (12) of the washer (10) is made of polytetrafluoroethylene; and that the thickness (X) of the washer (10) from the front side (11) to the back side (12) is in the range of 0.2 to 1.2 millimeters, in particular in the range of 0.2 to 1.0 millimeters.

2. Panel fastening system (1) according to claim 1, characterized in that the washer (10) is made entirely of polytetrafluoroethylene.

3. Panel fastening system (1) according to one of the preceding claims, characterized in that the washer (10) has a hardness of 50 to 72 Shore-D, in particular of 50 to 65 Shore-D, particularly preferably of 55 Shore-D.

4. Panel fastening system (1) according to claim 1, characterized in that the washer (10) has a core which is not made of polytetrafluoroethylene, and that the core is coated on the outside with a coating of polytetrafluoroethylene at least in the said contact area.

5. Panel fastening system (1) according to one of the preceding claims, characterized in that the washer (10) does not extend into the opening, but rests essentially flatly or exclusively flatly on the visible side (5).

6. Panel fastening system (1) according to one of the preceding claims, characterized in that the coating of the visible side (3) of the fiber cement panel is an acrylic coating or a polyurethane coating.

7. Panel fastening system (1) according to one of the preceding claims, characterized in that the outer diameter (D10) of the washer (10) is smaller than the outer diameter (D9) of the head section (9), in particular that the outer diameter (D10) of the washer (10) is 5% to 20%, in particular 5% to 15%, particularly preferably 6% to 10%, smaller than the outer diameter (D9) of the head section (9); or that the outer diameter (D10) of the washer (10) is larger than the outer diameter (D9) of the head section (9), in particular that the outer diameter (D10) of the washer (10) is 5% to 20%, in particular 5% to 15%, larger than the outer diameter (D10) of the head section (9); or that the outer diameter (D10) of the washer (10) is equal to the outer diameter (D9) of the head portion (9).

8. Panel fastening system (1) according to one of the preceding claims, characterized in that the outer diameter (D9) of the head portion (9) is in the range of 14 to 20 millimeters and that the outer diameter (D10) of the washer (10) is in the range of 12 to 18 millimeters.

9. Panel fastening system (1) according to one of the preceding claims, characterized in that the area of ​​the front side (11) and the area of ​​the rear side (12) has at least 35 square millimeters, in particular at least 40 square millimeters.

10. Panel fastening system (1) according to one of the preceding claims, characterized in that the surface on the head section (9) against which the front side (11) of the washer (10) rests is designed as a flat surface.

11. A panel fastening system (1) according to claim 10, characterized in that the flat surface extends radially outward from the shaft portion; and / or that the flat surface extends outward from the shaft portion at a right angle.

12. Panel fastening system (1) according to one of the preceding claims, characterized in that, in the assembled state, the head section is at a distance from the visible side which corresponds to the thickness of the washer, such that the washer (10) rests with its rear side (12) on the visible side (5) and is in contact with the head section (9) with its front side (11); and / or that, in the assembled state, the head section is at a distance from the visible side which is greater than the thickness of the washer, such that the washer (10) either rests with its rear side (12) on the visible side (5) or is in contact with the head section (9) with its front side (11).

13. Panel fastening system (1) according to one of the preceding claims, characterized in that there is no play between the central opening (13) and the shaft portion (8); or that there is a maximum play of 0.2 millimeters between the central opening (13) and the shaft portion (8).

14. Panel fastening system (1) according to one of the preceding claims, characterized in that the shaft portion (8) is designed as a rivet portion and that the head portion (9) is designed as a rivet head; or that the shaft portion (8) is designed as a threaded portion and that the head portion (9) is designed as a screw head.

15. Method for assembling a panel fastening system (1) according to one of the preceding claims, characterized in that in a first step the fiber cement panel (2) is placed on a substructure, that in a further step - the washer (10) is placed and the fastening element (7) is guided with the shaft section (8) first through the central opening (13) and through the opening (6) to the substructure; or - the combination of washer (10) and fastening element (7) is guided with the shaft section (8) first through the opening (6) to the substructure, and that in a further step the fastening element (7) is firmly mounted.

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