Vehicle Headrest Assembly Vibration Resistance Mechanism
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Solution Overview
Problem
Existing headrest assemblies in vehicles do not effectively resist vibrations when folded, leading to instability and potential interference with other seat components during storage and transport.
Innovation Solution
A headrest assembly with a push-button and lever system that allows for easy folding and includes a pawl mechanism to resist vibrations, featuring a locking plate and trigger system coupled with a linkage and pulley system for smooth movement and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a headrest assembly is made foldable for storage, then adaptability is improved, but stability deteriorates due to vibrations during folded state
Solution Approach 1:
The headrest assembly incorporates a dynamic locking mechanism that adapts its state based on operational requirements. The locking plate and pawl system automatically engages to provide rigid stabilization when the headrest is folded, while allowing smooth movement during adjustment. This dynamic transition between mobile and locked states resolves the contradiction between foldability and vibration resistance.
Solution Approach 2:
The pawl acts as an intermediary element between the locking plate and the headrest structure. It mediates the interaction by providing incremental locking points that resist vibrations while allowing controlled movement during folding operations. The pawl's engagement with the locking plate creates a stable connection that eliminates unwanted vibrations without preventing the intended folding motion.
2Stability of the object's composition
If a locking mechanism is added to resist vibrations, then stability is improved, but device complexity increases
Solution Approach 1:
The locking mechanism is segmented into distinct functional components: a locking plate with engagement features, a pawl with spring-loaded engagement, and a actuating lever system. This segmentation allows each component to perform its specific function independently while maintaining overall simplicity. The modular design reduces complexity by avoiding a monolithic locking system and instead using discrete, easily manufactured parts.
Solution Approach 2:
The locking mechanism is designed to be self-actuating through spring-loaded pawls that automatically engage with the locking plate when the headrest reaches its folded position. The spring force automatically pushes the pawl into engagement without requiring additional actuators or complex control systems. This self-service approach maintains stability while minimizing mechanism complexity.
Data Source
AI summary
This disclosure generally relates to a headrest assembly, seat, and a method of use. In the disclosure, a head restraint is moveable from an upright position to a folded position by movement of either the push-button or a lever. The disclosed arrangement provides two ways to fold a head restraint, and can further be integrated with another assembly, such as a seat back folding assembly. The disclosed arrangement is further configured to resist vibration, leading to a tighter, more stable design, which provides increased customer satisfaction.