Headrest Sleeve Retainer Insert for Tolerance Compensation
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Solution Overview
Problem
Existing headrest sleeve devices face issues with manufacturing and assembly tolerances, leading to slack and misalignment between rods and sleeves, requiring pre-stressing and complex manufacturing processes, and necessitating costly replacements due to integral resilient elements.
Innovation Solution
A retainer insert with annular spring clips and incurvate flex members that accommodate rods of different diameters, compensating for tolerances while allowing sliding movement, and enabling easy replacement of damaged components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sleeve device is designed for a specific rod size and configuration, then the fit between sleeve and rod is improved, but the adaptability to different rod sizes and configurations deteriorates
Solution Approach 1:
The resilient element's elasticity allows it to change its dimensional parameters (compression/expansion) to accommodate different rod diameters while maintaining consistent engagement force, enabling a single sleeve design to fit multiple rod sizes
Solution Approach 2:
The resilient element provides dynamic adaptation through elastic deformation, allowing the sleeve to adjust its internal dimensions in real-time based on the inserted rod's size, transforming a static fit problem into a dynamic adjustment mechanism
2Strength
If resilient elements are made as integral parts of the sleeve, then the structural integrity is improved, but the ease of repair deteriorates
Solution Approach 1:
The resilient element is designed as a separate, replaceable component rather than an integral part of the sleeve, allowing it to be independently removed and replaced without replacing the entire sleeve assembly
Solution Approach 2:
The resilient element is extracted as a distinct functional component from the sleeve structure, enabling its separate maintenance and replacement while preserving the sleeve body
3Reliability
If pre-stressing of headrest rods is implemented using resilient elements, then the slack between rod and sleeve is reduced, but the manufacturing complexity and time increase
Solution Approach 1:
The resilient element automatically applies pre-stress to the rod through its elastic properties upon insertion, eliminating the need for separate pre-stressing operations or complex adjustment mechanisms
Solution Approach 2:
The resilient element is pre-formed with specific elastic properties that automatically engage and pre-stress the rod during the insertion process itself, performing the pre-stressing action as part of the assembly rather than as a separate step
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 solution minimizes vibrations and rattling, reduces manufacturing complexity, and lowers costs by allowing a single sleeve device to fit various rods and simplifying repairs.
Implementation Method 1
a plurality of incurvate flex members, arranged parallel to and circumferentially spaced apart about the longitudinal central axis and connecting the first and the second annular spring clip, adapted to biasedly engage with a headrest support rod
Implementation Method 2
a first annular spring clip and a second annular spring clip, coaxial to and axially spaced apart from the first annular spring clip along a longitudinal central axis
Data Source
AI summary
A retainer insert for an inner axial passage of a headrest sleeve device includes a first annular spring clip, and a second annular spring clip, coaxial to and axially spaced apart from the first annular spring clip along a longitudinal central axis. Each annular spring clip is adapted to be received and mounted within the axial passage of the headrest sleeve device. A plurality of incurvate flex members are arranged parallel to and circumferentially spaced apart about the longitudinal central axis and connect the first and said second annular spring clip, and are adapted to biasedly engage with a headrest support rod.