Lignocellulosic Nail Tip Geometry for Lower Wood Splitting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Metal nails tend to rust and are costly to recycle, and wooden nails can cause splitting when used in wood-based materials, especially in anisotropic building materials like wood, and their production is laborious.
Innovation Solution
A nail made of lignocellulosic material with a conical tip angle greater than 40°, a thickened head area that widens continuously, and axial recesses to increase pull-through resistance, along with ribbed surfaces to enhance pull-out resistance, is developed. The nail tip angle is preferably between 45° and 60°, and the head region has a slot-shaped recess to increase contact pressure and the nail shank has longitudinal grooves for added stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conical nail tip with small tip angle (less than 20°) is used, then the nail can be inserted directly into wood without pre-drilling, but it causes splitting of the wood material
Solution Approach 1:
The patent applies parameter changes by modifying the tip angle of the conical nail tip from the conventional small angle (less than 20°) to a larger angle (greater than 40°, preferably 45°-60°). This parameter change resolves the contradiction by reducing the splitting effect on wood while maintaining the direct insertion capability, as the broader tip distributes force more evenly across the wood grain.
2Strength
If metal nails are used, then high strength and durability are achieved, but corrosion and high recycling costs occur
Solution Approach 1:
The patent applies parameter changes by transitioning from metal material to lignocellulosic material, fundamentally changing the material composition parameter. This resolves the contradiction by eliminating corrosion issues and reducing recycling costs associated with metal nails, while maintaining sufficient strength through optimized geometric parameters like the conical tip design and head region configuration.
3Strength
If a nail head is added to increase pull-through resistance, then pull-through performance is improved, but production complexity and cost increase
Solution Approach 1:
The patent applies local quality by creating a localized thickening of the nail body at the head region rather than adding a separate head component. This local modification provides increased pull-through resistance by creating a larger bearing surface, while maintaining production simplicity through a single-piece nail structure that can be manufactured using conventional processes.
Data Source
AI summary
A nail for a nail setting tool comprises a predominantly lignocellulosic material. The nail has a nail shank, at the front end of which is a nail tip in the form of a conical round tip. At the rear end region is a head region. The tip angle of the nail tip is >40°.