Blind Rivet Head Protrusions for Higher Torsion Resistance
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Solution Overview
Problem
Blind rivet elements lack sufficient resistance to torsion, leading to potential failure in tightening or releasing screw connections and risk of component damage, especially when penetrating coatings or layers on components.
Innovation Solution
A blind rivet element design featuring a head portion with protrusions in the radially outer region, providing enhanced torsional resistance and ability to penetrate coatings, with a shank and deformation portion for forming a closing head, and optionally an internal thread for a threaded bolt or nut, ensuring secure connections and electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the blind rivet element has a conventional design without protrusions in the radially outer region, then the structure is simpler, but the resistance to torsion is insufficient
Solution Approach 1:
The patent applies local quality by adding protrusions specifically in the radially outer region of the head portion, rather than uniformly modifying the entire structure. This localized addition provides enhanced torsional resistance through increased surface area and friction contact with the component, while maintaining simplicity in other regions of the blind rivet element.
2Reliability
If protrusions are formed in the radially inner region of the head portion, then the structure is simpler, but the protrusions may not penetrate the coating effectively and may deform during setting
Solution Approach 1:
The patent positions protrusions exclusively in the radially outer region of the head portion, where they benefit from greater leverage and stability during the setting process. This positioning ensures that protrusions penetrate coatings more effectively and maintain their structural integrity, avoiding deformation that would occur if they were located in the radially inner region closer to the setting hole.
3Reliability
If the blind rivet element is designed to penetrate coatings for electrical contact, then electrical connectivity is improved, but the risk of component damage during penetration increases
Solution Approach 1:
The patent modifies the geometric parameters of the head portion by adding protrusions in the radially outer region. This design change allows the protrusions to gradually penetrate the coating and establish electrical contact while distributing mechanical stresses, thereby reducing the risk of sudden component damage during the penetration process.
4Stability of the object's composition
If the blind rivet element has high torsional resistance through protrusions, then the screw connection stability is improved, but the tolerances of the through opening and setting process have greater influence
Solution Approach 1:
By positioning protrusions in the radially outer region of the head portion, the patent creates a design where the protrusions engage with the component at a location less sensitive to variations in through opening dimensions and setting process tolerances. This positioning provides a more stable engagement point that maintains screw connection stability even when manufacturing tolerances vary.
Data Source
AI summary
A blind rivet element has a head portion and a shank adjacent to the head portion in an axial direction. The shank has an internal thread or a connecting portion for a threaded bolt and a deformation portion between the internal thread or the connecting portion for the threaded bolt and the head portion for forming a closing head when the deformation portion is deformed. The head portion has a radially outer region formed spaced apart from the shank in a radial direction. The head portion has at least one first protrusion protruding in the axial direction formed exclusively in the radially outer region of the head portion, and/or the head portion has at least one second protrusion protruding counter to the axial direction formed exclusively in the radially outer region of the head portion.