Fastening Element Thread Profile for High-Speed Drive-in
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Solution Overview
Problem
Existing fastening elements, such as nails and bolts, experience substantial abrasion and reduced holding forces when driven into hard materials like concrete or steel due to their thread profiles, which act as graters at high drive-in speeds, leading to ineffective form locking connections.
Innovation Solution
A fastening element with a thread profile featuring a constant steep gradient of 50° to 74° on the second section and an increasing gradient on the first section, combined with uniformly distributed profile grooves of varying depths and widths, to facilitate rotation and minimize abrasion during high-speed drive-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional thread profile with constant depth and intermediate gradient is used, then the fastening element can be driven into hard materials, but the thread acts as a grater causing substantial abrasion and reduced holding forces at high drive-in speeds
Solution Approach 1:
The patent applies parameter changes by modifying the thread profile geometry - specifically creating a gradient depth profile where the groove depth increases from the tip toward the head, and optimizing the lead angle to be between 5° and 15°. These parameter changes transform the thread from a grating structure into a rotating screw structure that maintains holding forces even at high drive-in speeds exceeding 50 m/sec
2Strength
If a deeply cut-in thread profile is used to increase friction and material abrasion, then the holding effect improves, but at high drive-in speeds the thread causes substantial abrasion rather than rotation
Solution Approach 1:
The patent changes the geometric parameters of the thread profile by implementing a gradient depth configuration where groove depth increases from tip to head, and optimizing the lead angle to 5°-15°. This transformation enables the thread to function as a rotating screw rather than a grating tool, maintaining strong form locking connections while minimizing material abrasion during high-speed drive-in
Solution Approach 2:
The optimized thread profile with increased lead angle and gradient depth creates dynamic rotation of the fastening element during drive-in. This dynamic rotation converts the static grating action into a dynamic screwing action, improving holding effect while reducing harmful abrasion on the constructional component
3Object-affected harmful factors
If the thread profile has a shallow gradient, then abrasion is reduced, but the thread does not effectively rotate the fastening element and holding forces are insufficient
Solution Approach 1:
The patent optimizes the lead angle parameter to a specific range of 5° to 15°, which is steeper than conventional shallow profiles. This parameter optimization enables effective rotation and form locking while maintaining controlled abrasion. The gradient depth profile further enhances this by concentrating the threading action in the optimal zone
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 solution ensures effective form locking connections and increased holding forces, achieving a holding value of 15 KN in metallic components with minimal energy loss and reduced material abrasion, even at high drive-in speeds exceeding 50 m/sec.
Implementation Method 1
The stem is provided with a thread profile having, on a second section, a constant steep gradient with a lead angle from 50° to 74° and, on the first section, a gradient that increases from the lead angle of the second section toward the tip
Implementation Method 2
The thread serves for removal of the material produced by the drivable-in nail and increases the friction between the nail and the constructional component
Implementation Method 3
a thread profile is formed in the constructional component that increases the holding effect of the fastening element in the constructional component because of an improved form locking connection
Data Source
AI summary
A fastening element has a head (14), a stem (11) adjoining the head 914) and having a tip at its end remote from the head (14), a first bullet-shaped section (21) extending from the tip (13) in a direction of the head (14), and a thread profile (15) provided on the stem (11) and having, on the second section (22), a constant steep gradient with a lead angle (β2) from 50° to 74° and, on the first section (21), a gradient that increases from the lead angle (β2) of the second section (22) toward the tip (13), with a lead angle (β1) at a half of a length between the tip (13) and the end (24) of the first section (21) remote from the tip (13) amounting to at least 75°.