Helmet Liners With Glazed Slidable Finishes
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Solution Overview
Problem
Conventional helmets with multiple energy management liners require lubricants or extra low-friction layers to facilitate relative movement between layers, which can be impractical and may not effectively manage rotational energy during impacts.
Innovation Solution
A protective helmet design featuring an outer and inner energy management layer with slidable finishes, each with a glaze thickness of less than 2 mm, that directly contact each other without lubricants or interstitial slip layers, allowing for effective sliding and rotation to reduce energy transfer during impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lubricants or extra low-friction layers are used between energy management liners, then relative movement between layers is facilitated, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the lubricant layer entirely from the helmet structure, extracting the problematic intermediate layer that caused complexity while maintaining the essential function of relative movement between energy management liners through direct contact of slidable surfaces
Solution Approach 2:
The patent introduces a slidable finish as an intermediary surface treatment on the liners themselves, creating a low-friction interface through surface engineering rather than requiring a separate lubricant layer, thus facilitating movement while simplifying overall structure
2Reliability
If multiple layers of energy management materials are used, then rotational energy management is improved, but device complexity increases
Solution Approach 1:
The patent combines the energy management function and the slidable interface function into a single integrated liner structure with surface treatment, eliminating the need for separate lubricant layers and reducing the total number of components while maintaining rotational energy management effectiveness
Solution Approach 2:
The slidable finish on the energy management liners serves multiple functions simultaneously: it provides the necessary low-friction interface for rotational movement while also being integrated into the energy-absorbing structure, making the liner both protective and mobile without requiring additional components
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
This design reduces the severity of rotational injuries by minimizing energy transfer to the head during impacts, as the slidable finishes facilitate relative movement between the energy management layers, enhancing rotational energy management without the need for additional lubricants or layers.
Implementation Method 1
a space between the first slidable finish and the second slidable finish can be devoid of a lubricant and devoid of any interstitial slip layer to facilitate relative movement between the first slidable finish and the second slidable finish at a time of impact
Data Source
AI summary
A helmet for rotational energy management can include an outer energy management layer comprising an outer surface and an inner surface opposite the outer surface. The inner surface can comprise a first slidable finish comprising a first glaze comprising a thickness less than or equal to 2 millimeters (mm). An inner energy management layer can be disposed within the outer energy management layer and further comprise an outer surface oriented towards the outer energy management layer and an inner surface opposite the outer surface. The outer surface can comprise a second slidable finish that directly contacts the first slidable finish. The second slidable finish can comprise a second glaze comprising a thickness less than or equal to 2 mm. A space between the first slidable finish and the second slidable finish can be devoid of a lubricant and devoid of any interstitial slip layer.