Fastener Head Lubricant Coating Reduces Driver Blade Wear
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Solution Overview
Problem
Fastener driver blades experience significant wear and friction issues when driving rotatable fasteners, especially in dense substrates, leading to reduced tool control, increased labor costs, and frequent replacements.
Innovation Solution
Applying a lubricant, such as graphite, to the fastener head to create a barrier between the driver blade and the fastener, reducing frictional forces and wear on the driver blade, while also increasing the efficiency of the fastening tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a driver blade contacts the fastener head during driving, then the fastener can be driven into the workpiece, but the driver blade experiences significant wear and friction
Solution Approach 1:
The patent applies a lubricant coating to the fastener head that acts as an intermediary substance between the driver blade and the fastener head. This coating reduces direct metal-to-metal contact and friction, allowing the driver blade to maintain its integrity while still performing the fastening function. The lubricant layer transfers from the fastener head to the driver blade during contact, providing continuous protection.
Solution Approach 2:
The patent changes the surface properties of the fastener head by applying a lubricant coating, which alters the friction characteristics between the driver blade and fastener head. This parameter change (surface lubricity) reduces wear on the driver blade while maintaining the driving function, effectively extending blade life without sacrificing productivity.
2Duration of action of moving object
If the driver blade contacts the fastener head for extended periods, then the fastener can be fully driven, but the driver blade wears down and shortens
Solution Approach 1:
The lubricant coating on the fastener head serves as a protective intermediary that reduces friction during the extended contact period. This allows the driver blade to maintain full contact duration for complete fastener driving while minimizing material loss through wear, thereby preserving blade length.
Solution Approach 2:
The lubricant is applied to the fastener head in advance before the driving operation. This preliminary action ensures that the protective layer is already in place when the driver blade makes contact, preventing wear from the outset during the extended contact duration.
3Productivity
If the driver blade wears unevenly, then the fastener can still be driven, but the blade impacts the fastener head at a skewed angle
Solution Approach 1:
The lubricant coating provides a uniform protective layer that reduces differential wear across the driver blade surface. By minimizing friction during the driving operation, the coating helps maintain even wear patterns and prevents the development of skewed impact angles, preserving blade alignment precision.
Solution Approach 2:
The lubricant coating acts as a cushioning layer that distributes contact forces more evenly across the driver blade surface during the driving operation. This beforehand protection prevents localized stress concentrations that would cause uneven wear and subsequent alignment issues.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lubricant coating significantly reduces driver blade wear, decreases the power required to drive fasteners, and extends the life of the driver blade, with a notable reduction in tool pressure and heat generation, resulting in improved tool efficiency and reduced maintenance needs.
Implementation Method 1
Applying a lubricant, such as graphite, to the fastener head to create a barrier between the driver blade and the fastener, reducing frictional forces and wear on the driver blade
Implementation Method 2
These burn marks are indicative of the extreme frictional forces generated when driving a rotatable fastener into a workpiece that is more resistant to fastener penetration
Data Source
AI summary
A fastener and a method for reducing wear on a driver blade in a fastening tool includes applying a layer of solid-based lubricant between the head of a fastener and a driver blade end. The fastener is for use in a fastening tool and includes a head, a shank, and a layer of lubricant on the head of the fastener. The lubricant is graphite, molybdenum disulfide, tungsten disulfide, boron nitride, polytetrafluoroethylene (PTFE), nano-diamonds, calcium stearate, sodium stearate, oils, greases, waxes, thermoplastic polymers, or another lubricant that exhibits similar characteristics. Aromatic polyamides (such as Kevlar™), ultra-high molecular weight polyethylene, powdered glass, glass fibers, thermoplastic polymers, and thermoset polymers also are contemplate to provide a barrier to contact between the driver blade and fastener head. The lubricant is sprayed, rolled, brushed, blotted or otherwise applied between the head of the fastener and the driver blade end prior to firing the fastening tool.