Switchable Sliding Helmet Shell for Rotational Impact Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Helmets currently struggle to effectively manage oblique impacts, which can cause rotational injuries such as concussions and subdural hematomas, as the sliding mechanism intended to mitigate these injuries can be inconvenient during non-threatening situations and may not adequately reduce rotational acceleration.
Innovation Solution
A helmet design featuring an inner and outer shell with a sliding interface that includes a switch to selectively enable or prevent sliding between the shells in response to impacts, allowing controlled energy dissipation and reduced rotational acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sliding interface is provided between inner and outer shells to manage oblique impacts, then rotational injury protection is improved, but user convenience deteriorates due to unnecessary sliding during non-threatening situations
Solution Approach 1:
The helmet employs a dynamic switching mechanism that allows the sliding interface to be selectively enabled or disabled based on impact conditions. The switchable connection between inner and outer shells transitions from a static fixed state to a dynamic movable state when impact is detected, enabling the system to adapt its behavior - permitting sliding for rotational protection during impacts while preventing sliding during normal use to maintain user convenience
2Loss of energy
If sliding is permitted between shells during impact, then energy dissipation is improved, but device complexity increases due to the need for a switchable connection mechanism
Solution Approach 1:
The patent extracts the switching function from a complex control system and implements it through a simple mechanical or magnetic mechanism. The switchable connection is achieved by removing continuous engagement and replacing it with intermittent engagement controlled by a minimal mechanism that detects impact conditions and activates sliding only when needed, thereby enabling energy dissipation without substantial complexity increase
3Reliability
If the sliding interface is made more robust to ensure reliable rotational protection, then reliability of protection is improved, but ease of operation worsens due to increased friction and resistance during normal movement
Solution Approach 1:
The connection mechanism transitions from a static high-friction state to a dynamic low-friction state during impact. The switchable connection reduces friction and resistance during normal use to maintain ease of operation, while activating a more robust sliding interface during impact to ensure reliable rotational protection when needed
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
The helmet effectively reduces rotational acceleration and associated injuries by allowing sliding during impactful events while preventing unnecessary sliding in non-threatening situations, enhancing user convenience and safety.
Implementation Method 1
a sliding interface between the inner shell and the outer shell... relative sliding between the inner shell and the outer shell at the sliding interface in response to an impact to the helmet
Data Source
AI summary
A helmet comprising: an inner shell; an outer shell; a sliding interface between the inner shell and the outer shell; and a switch configured to be selectively switchable between first and second discrete modes, the first mode allowing relative sliding between the inner shell and the outer shell at the sliding interface in response to an impact to the helmet, the second mode preventing relative sliding between the inner shell and the outer shell at the sliding interface.