Rocking chair
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Solution Overview
Problem
Existing portable rocking chairs with spiral or torsion springs suffer from linear elastic coefficients, mechanical fatigue, noise, and difficulty in precise rocking regulation, affecting user comfort and reliability across various weight groups.
Innovation Solution
A rocking chair design utilizing polyurethane (PU) elastic blocks with a non-constant elastic coefficient, integrated with offset rotation angle spaces and blocking parts, to provide a stable and quiet rocking experience with precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If spiral springs or torsion springs are used for rocking mechanism, then the rocking function is implemented, but the elastic coefficient is linear causing damage or performance decline for overweight users
Solution Approach 1:
The patent changes the elastic coefficient parameter from linear to non-linear by using elastic blocks with gradually varying elastic coefficients. The elastic blocks are designed with varying density or structural composition, creating a non-linear elastic coefficient that adapts to different user weights, thereby resolving the contradiction between rocking performance and user weight adaptability.
2Reliability
If metal springs are used for rocking mechanism, then the rocking function is achieved, but mechanical fatigue occurs reducing reliability after long-time use
Solution Approach 1:
The patent employs composite material structure by combining multiple elastic blocks with different elastic coefficients, or using composite materials with gradually varying properties within the elastic blocks. This composite approach distributes stress more evenly and reduces mechanical fatigue, thereby improving both rocking reliability and service life.
3Force
If metal springs are used for rocking mechanism, then the elastic force is generated, but noise is produced during extension and contraction movement
Solution Approach 1:
The patent replaces durable metal springs with elastic blocks made from polymeric materials that are quieter during operation. While elastic blocks may have different durability characteristics, they effectively reduce noise during extension and contraction movements, addressing the noise issue while maintaining the elastic force generation function.
4Ease of operation
If spiral springs are mounted in exposed manner, then the rocking function is implemented, but the regulation control error is great and precise rocking regulation is difficult
Solution Approach 1:
The patent divides the rocking regulation system into segmented components: multiple elastic blocks with different elastic coefficients can be selectively positioned or combined, and the blocking parts are designed with specific geometries to define precise rotation angle spaces. This segmentation allows for finer control and reduced regulation error, improving rocking regulation precision while maintaining ease of operation.
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
Ensures comfort and reliability for a wide range of users by preventing damage and noise, while allowing precise rocking regulation and extending the chair's lifespan.
Implementation Method 1
elastic components with a non-constant elastic coefficient are mounted in the offset rotation angle spaces; and the first blocking parts and the second blocking parts are driven by the relative rotation of the support bodies and the seat body to rotate oppositely along a rotation angle direction to squeeze the elastic components, thus causing the elastic components to generate an elastic force
Data Source
AI summary
A rocking chair includes support bodies and a seat body. Support legs are mounted on the support bodies. A rocking frame assembly is mounted on the seat body. Two opposite parts of the seat body are defined as first and seconds matching surfaces. First and second blocking parts are formed on the first and second matching surfaces, respectively. The first and second blocking parts define offset rotation angle spaces on a path of relative rotation of the support bodies and the seat body. Elastic components are mounted in the offset rotation angle spaces, and the first and second blocking parts are driven by the relative rotation of the support bodies and the seat body to rotate oppositely along a rotation angle direction to squeeze the elastic components, thus causing the elastic components to generate an elastic force for the seat body to rock back and forth on the support bodies.