Multi-Stage Vehicle Headrest Deformation for Crash Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional headrests in vehicles fail to provide adequate safety and comfort for passengers of varying sizes during collisions, as they are not designed to absorb impact forces effectively regardless of the direction of travel or passenger height.
Innovation Solution
A fixed headrest structure with multiple phases of deformation, comprising a resilient member and a frame that secures to the vehicle, featuring different materials and geometries to absorb and distribute forces, ensuring safety for passengers across a wide range of heights and weights without adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional headrest is used, then the structure is simple and easy to manufacture, but it fails to provide adequate safety for passengers of varying sizes during collisions
Solution Approach 1:
The headrest is divided into multiple functional segments: a resilient member (first element) for initial impact absorption, a frame with first and second legs (second element) for structural support and force distribution, and a deformation mechanism (third element) for progressive energy absorption. This segmentation allows each component to perform its specific function optimally, resolving the contradiction between safety effectiveness and structural simplicity.
Solution Approach 2:
The headrest utilizes parameter changes through progressive deformation: the resilient member compresses under first minimum application of force, the first leg displaces toward the second leg under second minimum application of force, and the second leg bends under third minimum application of force. These staged parameter changes enable the headrest to adapt to varying impact forces and passenger sizes, improving safety effectiveness while maintaining a relatively simple overall structure.
2Adaptability or versatility
If a fixed headrest structure is used, then adjustment is unnecessary for different passengers, but the headrest must accommodate a wide range of passenger sizes and collision forces
Solution Approach 1:
The fixed headrest structure incorporates dynamic deformation capabilities through its resilient member and frame design. The resilient member compresses, the first leg displaces, and the second leg bends in response to applied forces, allowing the structure to adapt dynamically to different passenger sizes and collision intensities without requiring manual adjustment mechanisms.
Solution Approach 2:
The headrest employs beforehand cushioning through the resilient member positioned to contact the passenger's head. This resilient element is pre-configured to compress and absorb impact forces before they reach the rigid frame structure, providing protective cushioning in advance of the main impact event and enabling the fixed structure to handle a wide range of forces.
3Reliability
If the headrest absorbs impact forces through multiple phases, then safety is improved for various passenger sizes, but the deformation mechanism requires precise force thresholds
Solution Approach 1:
The headrest applies local quality by assigning different material properties and geometric characteristics to different components: the resilient member has high elasticity for initial compression, the first leg has specific structural properties for controlled displacement, and the second leg has geometric features enabling bending at predetermined forces. This localized optimization of material and geometric properties allows each component to deform at appropriate force thresholds, improving impact absorption reliability while managing manufacturing precision requirements through design rather than tight tolerances.
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 minimizes head and neck strain by absorbing and distributing impact forces across multiple phases, providing improved safety outcomes for passengers from the 5th to the 95th percentile in size, regardless of collision direction or passenger height.
Implementation Method 1
a portion of the resilient member is configured to compress in response to a first minimum application of force between the head of the passenger and the front surface of the resilient member
Implementation Method 2
a frame extending between the resilient member and a portion of the vehicle to secure the resilient member relative to the vehicle
Implementation Method 3
the first leg is configured to displace toward the second leg in response to a second minimum application of force between the head of the passenger and the front surface of the resilient member
Implementation Method 4
the second leg is configured to bend in response to a third minimum application of force between the head of the passenger and the front surface of the resilient member
Data Source
AI summary
A headrest may be fixed relative to a seat or a bank of seats in a vehicle and can provide multiple stages of deformation in response to a collision event. The headrest can include a resilient member that deforms in response to a first force caused by the collision event. The headrest can also include a frame that deforms in a first manner in response to a second force greater than the first force and in a second manner in response to a third force greater than the second force. Such a headrest can provide improved impact mitigation for occupants, regardless of height and/or weight such that occupants ranging from the 5th to 95th percentile in height and/or weight are afforded similar impact mitigation despite a fixed headrest structure. In some examples, multiple such headrests may be conjoined.