Headrest Sleeve Snap-Fit Assembly to Eliminate Screw Fastening
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Solution Overview
Problem
Existing headrest sleeve configurations require complex screw-fastening processes for assembly to a bracket fixed to a headrest stay, complicating the assembly process.
Innovation Solution
A headrest sleeve with a tubular shape, a collar-shaped flange, a bracket-fitting section, and an anchor clip that undergoes elastic deformation to engage with the bracket, allowing for screw-less assembly, and a cover-fitting section that enhances support and facilitates coupling with a cover member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flange is fastened to a bracket using plural screws, then the assembly is secure, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The patent replaces the screw fastening mechanism with a snap-fit mechanism. The insertion portion of the sleeve is elastically deformable and snaps into the fitting hole of the bracket, eliminating the need for screws and screwdrivers. This substitution maintains secure assembly while dramatically simplifying the assembly process.
Solution Approach 2:
The sleeve's insertion portion has elastic properties that allow it to automatically engage with the bracket's fitting hole without external fastening tools. The elastic deformation and recovery of the insertion portion create a self-locking mechanism that secures the assembly inherently, without requiring additional fasteners or complex procedures.
2Strength
If multiple screws are used to fasten the flange, then the connection is strong, but the assembly time increases
Solution Approach 1:
The patent replaces the multi-step screw fastening system with a single-step snap-fit mechanism. The elastic insertion portion deforms during insertion and then locks into place, achieving strong connection in one motion rather than requiring multiple screw fastening operations, thereby significantly reducing assembly time.
Solution Approach 2:
The insertion portion is pre-designed with elastic properties and geometric features that enable it to automatically engage and lock with the fitting hole upon insertion. This preliminary design of the elastic structure allows the connection to be established instantly without requiring sequential fastening operations.
3Reliability
If a complex fastening system is used, then the connection is reliable, but the manufacturing precision requirements increase
Solution Approach 1:
The patent replaces precision-critical screw hole alignment and threading with a more tolerant snap-fit mechanism. The elastic deformation capability of the insertion portion accommodates minor dimensional variations, reducing the stringency of manufacturing precision requirements while maintaining connection reliability.
Solution Approach 2:
The patent utilizes the elastic properties (physical parameter) of the insertion portion to create a compliant connection system. This parameter change from rigid to elastic allows the system to tolerate greater dimensional variations in manufacturing while maintaining reliable connection, thereby reducing precision requirements.
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
Simplifies the assembly process by eliminating the need for screw fastening, enhances support strength through dual-location attachment, and improves coupling precision and finish quality.
Implementation Method 1
an anchor clip provided at the bracket-fitting section and configured to undergo elastic deformation and elastic recovery during the fitting of the bracket-fitting section into the fitting hole so as to engage with the bracket from an opposite side from the flange
Data Source
AI summary
A headrest sleeve for assembly to a bracket fixed to a stay for supporting a main body of a headrest. The headrest sleeve includes a sleeve body formed in a tubular shape, a collar-shaped flange extending from one end portion of the sleeve body and disposed so as to be capable of contacting the bracket, a bracket-fitting section extending from the flange toward an opposite side from the sleeve body and configured to be capable of being fitted into a fitting hole formed in the lower bracket, and an anchor clip provided at the bracket-fitting section and configured to undergo elastic deformation and elastic recovery during the fitting of the bracket-fitting section into the fitting hole so as to engage with the bracket from an opposite side from the flange.