Headrest Support Structure for Stable Pivot and Easier Assembly
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Solution Overview
Problem
Existing headrest support structures face challenges in ensuring pivot operation accuracy and assembly ease due to potential offset of the pivot center, which affects the damper property and assembly difficulty, especially when the fit of components needs to be tight to prevent offset.
Innovation Solution
A headrest support structure featuring a hollow cylindrical bracket and headrest support with a protrusion on the outer surface, where the protrusion's amount increases with the insertion of a headrest stay, stabilizing the pivot center and allowing smoother assembly by inhibiting interference with the bracket's inner surface when not inserted, and incorporating parallel slits to reduce deformation force for easier insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fit of the headrest supports in the through-holes of the bracket is tight, then the pivot center position is stable and damper property is maintained, but assembly of the headrest supports into the brackets becomes difficult
Solution Approach 1:
The protrusion is designed to automatically engage with the inner peripheral surface of the bracket when the headrest support is inserted. This preliminary positioning action occurs during assembly, ensuring the pivot center is correctly positioned without requiring tight fits or complex alignment procedures. The protrusion makes contact first, guiding the headrest support into the correct position before the headrest stay is fully inserted.
Solution Approach 2:
The headrest support structure is segmented into distinct functional elements: the protrusion for positioning, the hollow cylindrical body for structural support, and the interface with the bracket. This segmentation allows each element to perform its specific function optimally - the protrusion handles positioning while the main body provides structural integrity, resolving the contradiction between precision and ease of assembly.
2Manufacturing precision
If a protrusion is provided on the outer peripheral surface of the headrest support to ensure stable pivot center, then interference with the bracket's inner peripheral surface occurs during assembly
Solution Approach 1:
The protrusion is designed with dynamic characteristics - it can elastically deform or flex during the assembly process to accommodate the bracket's inner peripheral surface, then maintains its positioning function once assembled. This dynamic behavior allows the protrusion to both engage smoothly during assembly and provide stable pivot center positioning during operation.
Solution Approach 2:
The geometric parameters of the protrusion are carefully optimized - its size, shape, and position are adjusted so that it contacts the bracket's inner peripheral surface at the correct location to establish the pivot center, while its dimensions are controlled to minimize interference during the insertion process. The parameters are tuned to balance positioning accuracy with assembly ease.
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 ensures stable pivot operation accuracy and damper property setting, facilitates smooth assembly by reducing interference, and allows for easier insertion of the headrest support, while maintaining effective elastic support for the headrest.
Implementation Method 1
a wire-like spring 55 that is made of metal extends across a portion that is toward the seat front
Implementation Method 2
The headrest support is pivotally supported with respect to the bracket, around a contact portion between a tip end of a protrusion provided on an outer peripheral surface of the headrest support and an inner peripheral surface of the bracket
Data Source
AI summary
A headrest support (12) having a hollow cylindrical shape and into which a headrest stay (14) is inserted, is inserted into a bracket (11) that has a hollow cylindrical shape and is fixed to a seat back frame (10). A protrusion (19), a tip end of which is a pivot center of the headrest support (12), formed such that a protrusion amount thereof increases in response to insertion of the headrest stay (14), is provided on an outer peripheral surface of this headrest support (12).