Lignocellulosic Nail Geometry for Direct Driving Without Splitting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Metal nails, particularly steel nails, tend to rust in outdoor conditions and complicate the recycling of wooden products, and existing wooden nails require pre-drilling, limiting their application.
Innovation Solution
A nail with a shaft comprising a smaller front section and a larger rear section, featuring a frusto-conical transition and a nail head, made from lignocellulosic materials like wood or wood-based composites, designed for direct driving into wood without pre-drilling, minimizing damage and enhancing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a uniform diameter nail shaft is used, then the nail has sufficient overall strength, but the splitting effect during driving increases causing damage to the component
Solution Approach 1:
The nail shaft is designed with different diameters in different sections: the front section has a smaller diameter (2.4-3.2mm) to reduce splitting effect during driving, while the rear section has a larger diameter (3.1-3.9mm) to provide sufficient overall strength. This local variation in diameter allows each section to optimize its function for the specific requirements of that area.
2Strength
If metal nails are used, then the nails have high strength and durability, but they rust under unfavorable conditions especially in acidic environments
Solution Approach 1:
The material of the nail is changed from metal to predominantly lignocellulosic material (wood or woody plant material like bamboo). This fundamental material parameter change eliminates the corrosion and rusting problems that affect metal nails, especially in acidic conditions such as tannin-rich woods, while maintaining sufficient mechanical strength for fastening applications.
3Ease of manufacture
If wooden nails with uniform diameter are used, then the nails are easy to manufacture, but they require pre-drilling of the surface which limits application efficiency
Solution Approach 1:
The nail features a conical tip section with gradually decreasing diameter that transitions into the main shaft. This local geometric variation at the tip enables the nail to be driven directly into wood without pre-drilling, significantly improving setting efficiency and productivity while maintaining ease of manufacture through conventional woodworking processes.
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a nail (1), in particular for use in a nailing device, which consists of an exclusively or predominantly lignocellulosic material and has a nail shaft (2) defining a nail axis (X) and a nail tip (6) arranged at the front end of the nail shaft (2), wherein the nail shaft (2) and the nail tip (6) have a circular cross-section, wherein the nail shaft (2) comprises a front nail shaft section (3) having a first diameter (Di) and a rear nail shaft section (4) having a second diameter (D2), wherein the second diameter (D2) is larger than the first diameter (Di), and wherein the nail tip (6) is arranged at the front end of the front nail shaft section (3).