Helmet Sliding Interface With Variable Friction for Impact Rotation
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Solution Overview
Problem
Existing impact protection apparatuses, such as helmets, face challenges in ensuring sufficient relative movement between moving parts to absorb and redirect impact energy while maintaining structural integrity and ease of manufacturing.
Innovation Solution
The helmet design incorporates first and second components with a sliding interface featuring surfaces with varying coefficients of friction to allow relative movement, utilizing low friction materials and connectors to facilitate sliding and shearing between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If friction between moving parts is reduced to allow sufficient relative movement under impact, then energy redirection capability is improved, but structural integrity and ease of manufacturing become more challenging
Solution Approach 1:
The sliding interface incorporates regions with different friction characteristics - a first region with reduced friction to enable relative movement and a second region with increased friction to maintain structural integrity. This local differentiation resolves the contradiction by providing both low friction where movement is needed and high friction where stability is required.
2Reliability
If moving parts are implemented in the helmet to redirect impact energy, then protective performance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The helmet is divided into multiple components including a first component, second component, and sliding interface with distinct regions. This segmentation allows each part to have optimized functions - the first region enables movement while the second region provides structural support - reducing overall system complexity compared to a fully movable design.
3Ease of operation
If a sliding interface with varying friction coefficients is implemented, then both relative movement and structural integrity are achieved, but manufacturing precision requirements increase
Solution Approach 1:
The sliding interface is designed with distinct first and second regions that have different friction coefficients. The first region is configured with lower friction to enable sliding, while the second region has higher friction for structural integrity. This local quality differentiation allows manufacturing tolerances to be managed regionally rather than requiring uniform precision across the entire interface.
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 effectively reduces rotational acceleration of the head by up to 90% during impacts, improving protection against tangential energy components and ensuring ease of assembly and manufacturing.
Implementation Method 1
the first surface has at least a first region which is divided into at least first and second areas that are configured such that at least one of the static coefficient of friction and the dynamic coefficient of friction for the first area against the second surface is different from the second area against the second surface
Data Source
AI summary
An item of protective apparel comprising: first and second components (41, 42) that are configured to move relative to one another; and a sliding interface provided between the first and second components; wherein the sliding interface comprises first and second surfaces (41, 42) that oppose one another and are configured to slide relative to each other; the first surface has at least a first region (45) which is divided into at least first and second areas (47, 48) that are configured such that at least one of the static coefficient of friction and the dynamic coefficient of friction for the first area against the second surface is different from the second area against the second surface; the first surface has a second region configured such that the static and/or dynamic coefficient of friction of the first surface against the second surface is different in the first region from the second region (46); the second region is divided into at least first and second areas (49, 50) that are configured such that at least one of the static coefficient of friction and the dynamic coefficient of friction for the first area against the second surface is different from the second area against the second surface; and the arrangement of the first and second areas in the first region is different from the arrangement of the first and second areas in the second region.