Flat Head Wood Screws for Façade Substructure Fastening
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Solution Overview
Problem
Conventional fastening methods for wooden facade substructures, such as countersunk screws, face issues with stability and reliability due to pull-through and bending under tensile loads, while hexagonal screws with washers increase assembly effort and protrusion difficulties.
Innovation Solution
The use of flat head wood screws for direct fastening of the facade substructure to the wall, which inhibits pull-through and allows for higher load-bearing capacity, reducing the number of screws required and simplifying assembly by avoiding protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If countersunk screws are used to fasten wooden slats to the wall, then the screws can be set flush with the surface, but the screws tend to pull through the wood easily and bend under load
Solution Approach 1:
The patent changes the geometric parameters of the screw head from a countersunk design (with a conical recess) to a flat head design (with a cylindrical or slightly domed surface). This parameter change in head geometry fundamentally alters the load distribution and prevents pull-through while maintaining flush setting capability. The flat head distributes loads over a larger surface area without requiring penetration into the wood, thereby resolving the contradiction between ease of setting and reliability under load.
2Reliability
If hexagonal screws with molded washer are used to fasten wooden slats to the wall, then the load-bearing strength is improved, but the screws protrude significantly above the surface making assembly more difficult
Solution Approach 1:
The patent modifies the head geometry parameter from a hexagonal shape with a molded washer (which protrudes) to a flat head shape (which sits flush or recesses slightly). This geometric transformation maintains the load-bearing advantages of washer-like distribution while eliminating the protrusion problem. The flat head design allows counter wooden slats to be attached easily without interference, thus resolving the contradiction between load-bearing strength and ease of subsequent assembly operations.
3Reliability
If a large number of screws are used to attach the facade substructure to the wall, then the load-bearing capacity is sufficient, but the assembly effort becomes considerable
Solution Approach 1:
The patent changes the screw head geometry from countersunk or hexagonal with washer to flat head, which fundamentally improves the load-bearing capacity per screw. This parameter change allows each individual screw to withstand higher tensile and shear loads, thereby reducing the total number of screws required to achieve the same overall load-bearing capacity for the facade substructure. Consequently, assembly effort is reduced while maintaining sufficient structural reliability.
Data Source
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AI summary
Arrangement (100) comprising a wall (102), a facade substructure (104) made of wood, and a plurality of wood screws (106) with a flat head (108), wherein the wood screws (106) with a flat head (108) are used exclusively for directly fastening the facade substructure (104) to the wall (102).