Headrest Holder Pressing Structure for Stay Rattle Suppression
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Solution Overview
Problem
Existing headrest holders struggle to effectively suppress rattling between the stay and the headrest due to insufficient pressing force and lack of components to restrict outward deformation of the pressing portion, especially when attached directly to the upper frame without a bracket.
Innovation Solution
A headrest holder with inwardly protruding pressing portions aligned in the up-down direction, fixed at both ends, and optionally paired with inclined portions and projection portions to ensure pressing force and inhibit oscillation, along with a locking mechanism for vertical fixation, all while being designed to minimize mold extraction complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the headrest holder is directly attached to the upper frame without a bracket, then the device complexity is reduced, but the pressing force cannot be ensured and rattling occurs
Solution Approach 1:
The pressing portion is segmented into multiple sections (first pressing portion and second pressing portion) that are fixed at both ends to the tube body. This segmentation allows each section to independently apply pressing force to the stay, ensuring reliable pressing force without requiring a complex bracket structure.
Solution Approach 2:
The pressing portions are arranged in the radial direction of the tube body, protruding inward to contact the stay. This radial arrangement provides multiple contact points around the circumference, distributing the pressing force effectively and preventing rattling without adding structural complexity.
2Ease of manufacture
If the pressing portion is made from easily deformable resin, then the ease of manufacture is improved, but the pressing force may be insufficient without a bracket to restrict deformation
Solution Approach 1:
The pressing portions are pre-formed with a specific shape that includes inclined portions and a contact portion. This preliminary shaping allows the pressing portions to automatically generate the required pressing force when the headrest holder is assembled, eliminating the need for a bracket to restrict deformation during operation.
Solution Approach 2:
The pressing portions are made from resin material that combines ease of manufacture with sufficient mechanical properties. The resin is formulated to provide both deformability for absorbing impact and sufficient strength to maintain pressing force, replacing the need for metal brackets.
3Manufacturing precision
If the pressing portion is designed assuming contact with the bracket, then the manufacturing precision is maintained, but rattling cannot be suppressed when no bracket is present
Solution Approach 1:
Instead of designing the pressing portion to contact the bracket (external reference), the design is inverted to make the pressing portion self-contained, with both ends fixed to the tube body. This inversion makes the pressing portion independent of the bracket, maintaining manufacturing precision while ensuring rattling suppression in bracketless configurations.
Solution Approach 2:
The pressing portion is designed to be self-sufficient, with both ends fixed to the tube body, allowing it to generate and maintain pressing force independently without relying on the bracket for support or positioning. This self-service design ensures consistent performance regardless of bracket presence.
4Ease of operation
If the stay can oscillate with one contact point, then the ease of operation is improved, but rattling occurs due to fulcrum oscillation
Solution Approach 1:
The pressing portion is divided into multiple sections (first and second pressing portions) that contact the stay at different locations. This segmentation creates multiple contact points that prevent the stay from oscillating around a single fulcrum, eliminating rattling while maintaining adjustment functionality.
Solution Approach 2:
The pressing portions are arranged not only in the radial direction but also positioned at different heights along the tube body. This multi-dimensional arrangement creates distributed contact points that constrain the stay effectively, preventing oscillation rattling while allowing smooth adjustment.
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 effectively suppresses rattling of the stay relative to the headrest holder by ensuring consistent pressing force and frictional contact, even with deformable materials, while maintaining structural integrity and ease of assembly.
Implementation Method 1
Each of the pressing portions is pressed against the stay, and outward deformation of the pressing portion is restricted by the inner peripheral surface of the bracket, thereby ensuring a pressing force by the pressing portion
Implementation Method 2
By the contact portion coming into surface contact with the stay, a pressing force from each pressing portion to the stay and a frictional force therebetween can be ensured
Data Source
AI summary
A plurality of pressing portions 38 protrude inward in a radial direction from an inner peripheral surface of a tubular main body portion 35 (part of a tube body) and are each fixed at both ends thereof in an up-down direction to the main body portion 35. Since the plurality of pressing portions 38 are aligned in the up-down direction, a stay 22 or 23 can be inhibited from oscillating with a contact portion between one pressing portion 38 and the stay 22 or 23 as a fulcrum. As a result, rattling of the stay 22 or 23 relative to a headrest holder 30 or 31 can be suppressed.