Asymmetrical Chin Strap Shell Design for Anti-Slippage
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Solution Overview
Problem
Conventional chin straps used in sports and physical activities are prone to slippage due to symmetrical design, leading to reduced protection and stability of the helmet on the user's head, and adjustable straps can result in a loose fit that compromises protection.
Innovation Solution
An asymmetrical chin strap design featuring a protective shell with a curved and convex contour and an inner cushion member, where the lower portion extends further beneath the chin, providing a larger surface area for engagement and preventing disengagement, combined with adjustable straps for secure fit adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a symmetrical cup design is used in conventional chin straps, then the structure is simple and easy to manufacture, but the chin strap is prone to slippage and cannot securely retain the helmet position during activity
Solution Approach 1:
The chin strap cup is designed with an asymmetrical configuration where the lower portion extends further beneath the chin than the upper portion, creating an asymmetrical surface area distribution. This asymmetrical design prevents the cup from slipping off the chin by creating a mechanical stop, while still maintaining a relatively simple single-piece construction that does not significantly increase manufacturing complexity.
2Adaptability or versatility
If adjustable straps are provided to facilitate precise fit for different users, then adaptability to different facial contours is improved, but the strap can be adjusted to a loose fit that compromises chin protection and increases slippage risk
Solution Approach 1:
The asymmetrical cup design creates a mechanical retention mechanism that works in conjunction with the adjustable straps. Even when straps are adjusted to longer lengths for a looser fit, the asymmetrical cup geometry ensures the chin strap cannot slip off the chin, maintaining protection reliability while preserving adaptability.
Solution Approach 2:
The asymmetrical cup design proactively prevents slippage before it can occur by creating a geometric mechanical stop. This preliminary anti-action counteracts the potential harmful effect of loose strap adjustment, ensuring that even when straps are adjusted for comfort or different user sizes, the chin strap remains securely positioned.
3Reliability
If the lower portion of the chin strap extends further beneath the chin, then the surface area for engagement is increased and slippage is prevented, but the device complexity and material usage increase
Solution Approach 1:
The chin strap cup employs an asymmetrical design where only the lower portion extends further beneath the chin, creating the necessary mechanical retention without requiring the entire cup structure to be oversized. This targeted extension provides effective anti-slippage capability while minimizing unnecessary material usage compared to a fully enlarged symmetrical design.
Data Source
AI summary
A chin strap includes a protective shell including a curved and convex contour extending between lengthwise ends of the shell, the shell further including a first curved edge extending between the lengthwise ends of the shell and a second curved edge extending between the lengthwise ends of the shell. A cross-section along a lengthwise central axis of the chin strap defines a first shell portion including the first curved edge and a second shell portion including the second curved edge. The first shell portion of the cross-section defines a first surface area between the lengthwise central axis and the first curved edge, and the second shell portion of the cross-section defines a second surface area between the lengthwise central axis and the second curved edge, where the first surface area is less than the second surface area.