Reclining Chair Headrest Hinge for Simple Tilt and Height Adjustment
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Solution Overview
Problem
Conventional reclining headrest mechanisms for chairs are complex, inconvenient for tilt angle adjustments, and prone to malfunctions, and lack a height adjustment mechanism.
Innovation Solution
A reclining headrest design featuring a clamping member with hollow cylindrical yoke arms, a cup-shaped hinge head, and frictionally secured joints, allowing for adjustable tilt and height settings through a lever mechanism, enabling secure and adjustable positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional recline mechanisms are used, then headrest reclining function is achieved, but the mechanism becomes complicated and liable to malfunction
Solution Approach 1:
The recline mechanism is divided into independent functional segments: the support member with hinge head for tilt adjustment, and the height adjustment mechanism with first/second adjusting members. Each segment operates independently, simplifying the overall mechanism while maintaining reliability.
Solution Approach 2:
The complex conventional recline mechanism is extracted and replaced with a simplified hinge-based system. The hinge head and hinge element provide the necessary recline function through simple rotational movement, eliminating unnecessary intermediate components that caused malfunctions.
2Ease of operation
If conventional recline mechanisms are used, then headrest reclining function is achieved, but tilt angle adjustment becomes inconvenient
Solution Approach 1:
The support member is designed to be manually adjustable by the user without requiring additional actuators or complex controls. The user can directly manipulate the support member to achieve desired tilt angles, and the hinge mechanism maintains the position through friction or mechanical interference, eliminating the need for powered adjustment systems.
Solution Approach 2:
The hinge connection between the support member and clamping member allows dynamic adjustment of the tilt angle. The hinge element can rotate within the hinge head to change the angle, providing continuous adjustability rather than fixed positions, while the frictional engagement maintains the selected angle during use.
3Adaptability or versatility
If height adjustment mechanism is added, then headrest positioning flexibility is improved, but device complexity increases
Solution Approach 1:
The height adjustment mechanism uses a nested structure where the first adjusting member is received within the second adjusting member. This nested arrangement allows both adjustment functions to be integrated in a compact space without requiring separate mechanisms, maintaining simplicity while providing versatility.
Solution Approach 2:
The support member serves multiple functions: it provides the structural connection between the clamping member and head frame, enables tilt angle adjustment through the hinge connection, and facilitates height adjustment through the adjusting members. This multi-functionality reduces the need for additional dedicated components.
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 design simplifies tilt angle and height adjustments, ensuring secure and maintainable positions, enhancing user comfort and reducing the likelihood of malfunctions.
Implementation Method 1
a first hinge element pivotably disposed in one yoke arm and comprises a lever; and a second hinge element moveably disposed in the other yoke arm and the hinge head, wherein the lever can be rotated counterclockwise to securely fasten the hinge head
Implementation Method 2
two rear bars and two joints each frictionally, slidably fastened on the bar, each joint being frictionally, pivotably secured to the fastening portion
Data Source
AI summary
A chair includes at least one leg; a rotatable seat; a backrest; and a headrest including a clamping member having a yoke with two hollow cylindrical yoke arms; two hook members extending forward downward from both sides of the yoke respectively; and a lower well; a support including a hinge head pivotably disposed between the yoke arms; and two opposite fastening portions; a head frame including two rear bars and two joints frictionally, slidably fastened on the bars, each joint frictionally, pivotably secured to the fastening portion; a hooking member in the well and including two hook elements curved upward forward wherein the hook elements cooperate with the hook members to releasably mount the headrest on the backrest; a first hinge element pivotably disposed in one yoke arm and includes a lever; and a second hinge element moveably disposed in the other yoke arm and the hinge head.