Folding Chair Stacking Mechanism for Universal Interlocking Stability
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Solution Overview
Problem
Existing folding chairs constructed of synthetic polymeric materials face limitations in simulating the aesthetic appearance, comfort, and safety of wooden chairs, and often require specific types to be stacked uniformly, lacking universal stacking ability.
Innovation Solution
The folding chair design includes multiple arrangements to prevent relative longitudinal and transverse movement, featuring stacking ribs, coupling mechanisms, and restraining bars to allow for stable stacking of different chair constructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If folding chairs are constructed of synthetic polymeric materials, then durability and flexibility for stacking are improved, but the ability to simulate the aesthetic appearance, comfort, and safety of wooden chairs deteriorates
Solution Approach 1:
The patent changes the physical and chemical parameters of synthetic polymeric materials through additives, fillers, and processing conditions to achieve wood-like appearance characteristics including grain patterns, color variations, and surface textures that simulate traditional wooden chair aesthetics
Solution Approach 2:
The patent employs composite material construction by combining synthetic polymeric materials with wood fibers, natural fillers, or surface coatings to create a hybrid material system that exhibits both the durability of plastics and the aesthetic qualities of wood
2Adaptability or versatility
If folding chairs are constructed of synthetic polymeric materials, then flexibility for stacking is improved, but strength and weight considerations deteriorate
Solution Approach 1:
The patent divides the chair structure into multiple modular components including separate leg assemblies, seat sections, and stacking interfaces, allowing each segment to be optimized for both strength and stacking flexibility independently
Solution Approach 2:
The patent incorporates dynamic structural features such as collapsible mechanisms, adjustable components, and flexible connection joints that enable the chair to adapt its configuration for stacking while maintaining structural integrity during use
3Reliability
If folding chairs are constructed of synthetic polymeric materials, then durability is improved, but comfort and safety characteristics deteriorate
Solution Approach 1:
The patent applies different material properties and surface characteristics to specific regions of the chair, such as adding cushioning layers to contact surfaces, texturing areas for grip, or incorporating ergonomic contours in seating zones while maintaining durable synthetic polymer construction in structural areas
4Productivity
If folding chairs are designed for stacking, then storage efficiency is improved, but the ability to stack different chair constructions uniformly deteriorates
Solution Approach 1:
The patent designs standardized stacking interfaces and uniform dimensional proportions that enable chairs of different constructions to interlock and stack together in stable configurations, creating a universal stacking system that accommodates various chair types while maintaining storage efficiency
Data Source
AI summary
A folding chair for movement between a folded condition and an unfolded erect condition, includes a frame member and support member pivotally connected to each other, a seat member pivotally mounted to the frame member, and two arrangements for preventing longitudinal sliding movement of two of the chairs stacked upon one another and two arrangements for preventing transverse longitudinal sliding movement of two of the chairs stacked upon one another.