Folding Chair Backrest Linkage for Adjustable Recline and Compact Storage
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Solution Overview
Problem
Conventional folding chairs lack an adjustable backrest mechanism that allows for comfortable positioning and efficient folding for storage, which limits their usability and convenience.
Innovation Solution
The chair features a frame with pivotally connected crossbeams and legs, a telescoping leg design, and an adjustable backrest with pivot connections to the seat and frame, enabling the backrest to change positions and fold compactly by detaching its components for reduced size during storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the backrest is made fixed and rigid, then structural stability is improved, but adaptability and comfort are worsened
Solution Approach 1:
The backrest is designed with pivot connections at both the top and bottom, enabling it to rotate between multiple fixed positions (e.g., upright, reclined, folded) while maintaining structural stability in each position. This dynamic capability allows the backrest to adapt to different user comfort needs and storage requirements without compromising structural integrity.
2Volume of moving object
If the chair is designed for compact folding, then storage efficiency is improved, but ease of operation is worsened
Solution Approach 1:
The chair is divided into separable components including the backrest, seat, and leg assemblies connected by pivot points. This segmentation allows each component to be independently manipulated during folding operations, reducing the overall volume to a compact form while maintaining simple, intuitive folding actions through the pivot connections.
3Adaptability or versatility
If the backrest is made adjustable with multiple positions, then comfort is improved, but device complexity is worsened
Solution Approach 1:
The backrest employs a dynamic pivot connection system with hinge joints at the top and bottom, allowing rotation between multiple positions without requiring complex locking mechanisms or additional actuators. The simplicity of the pivot-based dynamic structure enables multi-position adjustability while minimizing mechanical complexity.
Data Source
AI summary
A folding chair has a frame having first and second front legs and first and second rear legs. A back rest is operatively pivotally connected to the rear legs. A seat is slidingly connected to the first and second front legs and pivotally connected to the back rest, thereby enabling the angle of the backrest relative to the rear leg to be adjustable as the seat slides toward and away from the front legs.