Blind Rivet Head Projections for Anti-Rotation Screw Joints
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Solution Overview
Problem
Blind rivet elements lack sufficient security against rotation, leading to issues with tightening or loosening screw connections and potential damage to components, especially when penetrating coatings or lacquer layers for electrical contact.
Innovation Solution
A blind rivet element design featuring a head section with projections in the radially outer region, which enhances rotational security by directing torsional forces into the component, allowing for effective penetration through coatings and secure electrical contact, while minimizing interference with setting tools and avoiding unintended deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blind rivet element is designed without projections in the radially outer region of the head portion, then the setting process is simpler and easier, but the anti-rotation security is insufficient
Solution Approach 1:
The patent applies local quality by adding projections only in specific regions of the head portion (radially outer region) rather than modifying the entire structure. These projections are localized features that provide anti-rotation security without requiring complex changes to the overall rivet design, thus resolving the contradiction between reliability improvement and device complexity.
2Reliability
If projections are formed in the radially inner region of the head portion, then the anti-rotation security is improved, but the projections may not properly penetrate the component and may instead remain in the through-hole
Solution Approach 1:
The patent resolves this contradiction by changing the radial position dimension of the projections from the radially inner region to the radially outer region of the head portion. This dimensional change ensures that projections are positioned far enough from the through-hole to guarantee proper penetration into the component, while still providing effective anti-rotation security through their strategic placement in the radially outer region.
3Reliability
If projections are formed in the radially inner region of the head portion, then the anti-rotation security is improved, but the blind rivet element may tilt during insertion
Solution Approach 1:
The patent applies local quality by positioning projections specifically in the radially outer region of the head portion, which is the region that contacts the component during insertion. This localized placement provides anti-rotation security while maintaining insertion stability, as the projections are positioned to engage with the component material rather than interfering with the insertion process.
4Reliability
If the head portion has a larger diameter to accommodate projections, then the anti-rotation security is improved, but the blind rivet element may be damaged by setting tools during the setting process
Solution Approach 1:
The patent resolves this contradiction by localizing the projections to specific regions of the head portion (radially outer region) rather than increasing the overall head diameter. This allows the head portion to maintain its original dimensions and avoid interference with setting tools, while still providing effective anti-rotation security through the strategically positioned projections.
Data Source
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AI summary
The invention relates to a blind rivet element (1). The blind rivet element (1) has a head section (2) and a shank (3) adjoining the head section (2) in an axial direction (Z), wherein the shank (3) has an internal thread or a connecting section for a threaded bolt and a deformation section between the internal thread or the connecting section for the threaded bolt and the head section (2) for forming a closing head when the deformation section is deformed.The head section (2) has a radially outer region, wherein the radially outer region is spaced radially apart from the shaft (3), wherein the head section (2) has at least one first projection (7) extending in the axial direction (Z), wherein the at least one first projection (7) is formed exclusively in the radially outer region of the head section (2), and/or wherein the head section (2) has at least one second projection (8) extending opposite to the axial direction (Z), wherein the at least one second projection (8) is formed exclusively in the radially outer region of the head section (2).