Ratchet Headrest for Impact Absorption and Whiplash Prevention
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Solution Overview
Problem
Existing headrests fail to effectively cushion an occupant's head during collisions and prevent whiplash, relying on sensors and electronic components that can fail, and do not reduce the recoil of the head towards the front of the vehicle, leading to traumatic brain injuries and ligament tears.
Innovation Solution
A mechanical reduced-impact-and-recoil headrest utilizing a ratchet mechanism with complementary tapered surfaces and a biasing member that translates to absorb impact energy and prevent recoil, without relying on sensors or electrical components, featuring a housing and bracket with ratcheting surfaces and walls that deform to cushion the head and neck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional stationary headrests are used, then the headrest structure is simple and reliable, but the headrest cannot cushion the occupant's head during collision and may cause severe TBI
Solution Approach 1:
The headrest is designed with a ratchet mechanism that allows it to transition from a stationary state to a movable state during collision. The movable bracket can translate toward the distal wall to absorb impact energy, while the ratchet mechanism prevents automatic return to pre-impact position, providing dynamic protection without requiring complex electronic sensors or actuators.
2Reliability
If active headrests with sensors and electronic components are used, then the headrest can detect and respond to collision, but the device complexity increases and reliability decreases due to potential sensor failure
Solution Approach 1:
The headrest employs a passive ratchet mechanism that automatically activates during collision without requiring sensors, electronics, or external power sources. The mechanical design self-regulates based on impact forces, with the movable bracket translating when needed and the ratchet mechanism preventing recoil, thereby achieving high reliability through simplicity.
3Object-affected harmful factors
If the headrest remains stationary during collision, then the structure is simple, but the headrest does not reduce recoil of the occupant's head toward the front end of the vehicle, leading to whiplash
Solution Approach 1:
The ratchet mechanism is designed to prevent the movable bracket from automatically returning to its pre-impact position after collision. This unidirectional constraint converts the potential harmful recoil motion into a beneficial sustained protective position, reducing whiplash risk while maintaining mechanical simplicity through a straightforward ratchet-and-pawl design.
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 headrest effectively reduces the impact and recoil of the occupant's head during collisions, minimizing the risk of traumatic brain injuries and whiplash by absorbing kinetic energy and preventing the headrest from returning to its pre-impact position, thus providing enhanced safety without electronic dependencies.
Implementation Method 1
a biasing member forcing at least one of the lateral contacting surfaces and at least one of the lateral interior surfaces into contact with each other
Implementation Method 2
The exterior proximal wall and the interior proximal wall are configured to deform toward a distal wall during an impact
Data Source
AI summary
A reduced-impact-and-recoil headrest that includes a ratchet mechanism, allowing components to incrementally translate with respect to each other. The reduced-impact-and-recoil headrest includes an exterior housing surface that is deformable, providing cushioning for a vehicle occupant's head. The headrest also includes an interior compartment within the housing, with the ratchet mechanism disposed within the interior compartment. The headrest is configured to decrease the force of a collision experienced by the occupant, thereby decreasing the likelihood and severity of traumatic brain injuries resulting from the occupant's head striking a stationary headrest. Instead, the reduced-impact-and-recoil headrest is configured to incrementally move with the occupant's head, providing an incremental cushion for the occupant's head. The ratchet mechanism also prevents the reduced-impact-and-recoil headrest from automatically translating back to its pre-impact position, thereby decreasing the occupant's risk of ligament tear and whiplash.