Headrest Wing Adjustment Mechanism With Wire Friction Control
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Solution Overview
Problem
Conventional headrest wing adjustment mechanisms face difficulties in separately adjusting operating forces for pushing and pulling, and require complex structures with many components, making them cumbersome to manage and adjust.
Innovation Solution
The apparatus employs a rotating rod with a wire wound around it, where the wire's inner diameter is smaller than the rod's outer diameter, allowing for adjustable frictional force by winding or unwinding, enabling distinct operating forces for pushing and pulling, and using multiple wires to fine-tune these forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple polymerized plates are used to adjust headrest wing angle, then the operating force can be adjusted as a whole, but it is not possible to separately adjust the operating forces for pushing and pulling
Solution Approach 1:
The patent divides the adjustment mechanism into separate components: a first friction member for adjusting operating force in the pushing direction and a second friction member for adjusting operating force in the pulling direction. This segmentation allows independent adjustment of operating forces for each direction, resolving the contradiction between overall adjustability and separate adjustment capability.
2Stability of the object's composition
If ratchet gear and stopper are used to fix headrest wing angle, then the angle can be fixed, but the number of components increases and management becomes difficult
Solution Approach 1:
The patent combines the friction-based adjustment mechanism with the angle fixation function into an integrated system. The friction members not only adjust operating force but also work together with the rotating rod to provide angle fixation, eliminating the need for separate ratchet gears and stoppers, thus reducing component count while maintaining fixation capability.
Solution Approach 2:
The friction members are designed to serve multiple functions: adjusting operating force in specific directions and contributing to angle fixation. This multi-functionality reduces the need for dedicated components for each function, simplifying the overall structure while maintaining both adjustability and stability.
3Force
If wire inner diameter is smaller than rotating rod outer diameter, then frictional force increases and operating force adjusts, but assembly complexity may increase
Solution Approach 1:
The patent employs a dynamic assembly process where the wire is elastically expanded to fit over the rotating rod. This dynamic approach allows the wire (with smaller inner diameter than the rod's outer diameter) to be assembled by temporarily expanding it, then it contracts to create the desired frictional contact. This resolves the contradiction by enabling friction-based force adjustment while maintaining ease of assembly through elastic deformation.
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
This solution simplifies the assembly structure, reduces the number of components, allows for easy adjustment of operating forces, and prevents grease leakage during assembly, while maintaining and repairing the apparatus is facilitated by a cap.
Implementation Method 1
a frictional force increases and an operating force of the headrest wing increases when a load is assigned to the one end of the wire in a direction in which the wire is wound, and the frictional force decreases and the operating force of the headrest wing decreases when a load is assigned to the one end of the wire in a direction in which the wire is unwound
Data Source
AI summary
The present disclosure relates to an apparatus for adjusting a headrest wing, and more particularly, to an apparatus for adjusting a headrest wing in which a wire is used to make operating forces at the time of pushing and pulling a headrest wing to be different so that convenience is given to a user.