Helmet Low Friction Layer Rotational Energy Management
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Solution Overview
Problem
Conventional helmets have limited rotational movement between the comfort liner and the protective shell due to friction, which can hinder the effectiveness of impact absorption and energy distribution during an impact.
Innovation Solution
A protective helmet design featuring a low friction layer coupled to the inner surface of the protective shell, with a comfort liner removably attached using elastically deformable couplings, allowing for increased rotational movement and energy management without adding bulk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a comfort liner is directly coupled to the protective shell, then the structural stability is improved, but the rotational movement during impact is limited due to friction
Solution Approach 1:
A low friction layer is introduced as an intermediary component between the protective shell and the comfort liner. This layer has a coefficient of friction less than 0.3, enabling the comfort liner to rotate and slide relative to the protective shell during impact, thereby improving rotational energy management while maintaining structural stability through the coupling mechanism.
2Ease of operation
If the low friction layer is made thicker to improve rotational movement, then the ease of operation is improved, but the helmet volume increases
Solution Approach 1:
The low friction layer is designed with an optimized thickness range of 0.5mm to 3mm. This parameter optimization provides sufficient rotational movement capability while minimizing the increase in helmet volume. The specific thickness can be selected based on the desired balance between rotational freedom and volume constraints.
3Manufacturing precision
If conventional coupling methods are used to attach the comfort liner, then the manufacturing precision is improved, but the rotational energy management is hindered
Solution Approach 1:
The coupling mechanism is designed to be dynamic rather than rigid, allowing the comfort liner to rotate and move relative to the protective shell during impact. This dynamic coupling maintains manufacturing precision through proper alignment features while enabling energy absorption through rotational movement, converting static attachment into a dynamic energy management system.
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
Enhances the rotational energy management capabilities of helmets, ensuring better impact absorption and distribution while maintaining comfort and fit, without requiring significant redesign or additional thickness.
Implementation Method 1
the rotational movement of the comfort liner with respect to the protective shell is limited during impact due to the friction between the comfort liner and the protective shell
Implementation Method 2
The protective shell comprises an energy absorbing material
Implementation Method 3
The comfort liner may be removably coupled to the protective shell with one or more elastically deformable couplings that extend from the comfort liner through the low friction layer to the protective shell
Data Source
AI summary
A protective helmet having a protective shell, a low friction layer, and a comfort liner is disclosed. The protective shell includes an energy absorbing material and an inner surface. The low friction layer is coupled to the inner surface of the protective shell. The low friction layer may be plastic having a thickness of less than approximately 3 mm. The comfort liner is removably coupled to the low friction layer opposite the protective shell, and includes a low friction material, such as brushed nylon, adjacent the low friction liner. The comfort liner may be removebly coupled protective shell with either clips that removably couple to receivers embedded in the brow of the helmet, with elastically deformable couplings that extend from the comfort liner to the protective shell, or both.