Facade panel screw and fastening arrangement therewith
A facade panel screw for the optimized fastening of facade panel elements to a substructure has a head having a very large diameter, a subsequent, essentially cylindrical shaft section ( 22 ) extending along a central longitudinal axis (A) and a subsequent tip region ( 23 ). The shaft section ( 22 ) includes, as viewed from the head, a threadless underhead section ( 24 ), a stop collar ( 25 ) and a threaded section ( 28 ). The thread in a first part ( 26 ) of the threaded section ( 28 ) subsequent to the stop collar ( 25 ) has an outer diameter D r , which is attenuated compared to the thread in a second part ( 27 ) with outer diameter D n , over several convolutions, so that D r <D n . This threaded section 26 allows a controlled overwinding of the facade panel screw in use. A corresponding fastening arrangement includes a facade panel, a substructure for transferring the load to a building surface and the facade panel screw.
1. A facade panel screw ( 20 ), comprising:
a head ( 21 );
a cylindrical shaft section ( 22 ) that extends along a central longitudinal axis (A);
a tip region ( 23 );
the cylindrical shaft section ( 22 ), viewed from the head, comprises:
a threadless underhead section ( 24 ),
a stop collar ( 25 ), and
a threaded section ( 28 );
a thread in a first part ( 26 ) of the threaded section ( 28 ) subsequent to the stop collar ( 25 ) has an outer diameter D r , which is attenuated over several convolutions compared to the thread in a second part ( 27 ) having an outer diameter D n , so that D r <D n .
2. The facade panel screw ( 20 ) according to claim 1 , wherein the thread of the first part of threaded section ( 26 ) merges continuously into the thread of the second part of the threaded section ( 27 ).
3. The facade panel screw ( 20 ) according to claim 1 , wherein a pitch in an entirety of the threaded section ( 28 ) is equally large.
4. The facade panel screw ( 20 ) according to claim 1 , wherein the thread in the threaded section ( 28 ) includes multiple threads.
5. The facade panel screw ( 20 ) according to claim 1 , wherein D r =a D n , and a can assume values between 0.7 and 0.9, each inclusive.
6. The facade panel screw ( 20 ) according to claim 1 , wherein the attenuation is achieved by axially parallel removal of thread crests ( 29 ).
7. The facade panel screw ( 30 ) according to claim 1 , wherein the stop collar ( 25 ) has a diameter D b for which applies: D b =b D n , wherein b assumes values between 1.07 and 1.24, each inclusive.
8. The facade panel screw ( 20 ) according to claim 1 , wherein the stop collar ( 25 ) has an axial extent of less than 1 mm.
9. The facade panel screw ( 20 ) according to claim 1 , wherein the stop collar ( 25 ), viewed radially, protrudes beyond thread crests of the thread in the second part of the threaded section ( 27 ) by less than 1 mm.
10. The facade panel screw ( 20 ) according to claim 1 , wherein the tip region ( 23 ) is self-drilling, self-tapping, or a drill bit.
11. A fastening arrangement comprising:
a substructure;
a facade panel; and
the facade panel screw ( 20 ) according to claim 1 that connects the facade panel to the substructure.
12. The fastening arrangement according to claim 11 , wherein the substructure is a metal construction and at a fastening point has a material thickness of 2 to 6.5 mm of aluminum or 0.9 to 2.5 mm of steel.
13. The fastening arrangement according to claim 11 , wherein the facade panel is made of plastic, metal, fiber cement, insulation materials or a composite of one or more such materials.
14. The fastening arrangement according to claim 11 , wherein the underhead section ( 24 ) has an extension in an axial direction, which results as a thickness of the facade panel plus 2-4 mm.
15. The fastening arrangement ( 20 ) according to claim 11 , further comprising at least one of a damping, insulating, friction-reducing or adhesive intermediate layer attached between the substructure and the facade panel.