Portable Slat Seat Hinge Reinforcement With Closed-Cell Foam
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Solution Overview
Problem
Collapsible portable slat seats face wear and tear issues due to fabric material degradation along the fold line, particularly exacerbated by use by special needs children who rock and move in the chair, requiring a durable and comfortable hinge solution that maintains environmental safety and manufacturing simplicity.
Innovation Solution
Integration of a closed cell foam material, such as a polyolefin strip, at the fold line hinge to prevent wear and enhance comfort and sensory integration, utilizing materials like Duraco Nitrile PVC blend strips for durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fabric material is used along the chair fold line, then the chair remains simple and lightweight, but the fabric material wears through due to continual abrasive movement
Solution Approach 1:
The patent applies composite materials by combining fabric material with a plastic coating or laminate layer. This composite structure allows the fabric to maintain its simplicity and comfort while the plastic coating provides enhanced wear resistance against the sliding slats and folding movements, resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent changes the physical-chemical parameters of the fabric material by applying a plastic coating or laminate. This modification alters the surface properties of the fabric, increasing its friction resistance and durability without fundamentally changing the fabric construction or manufacturing process, thus maintaining simplicity while improving wear resistance.
2Reliability
If different material than canvas is used, such as vinyl and vinyl covered canvas, then wear resistance improves, but the chair loses environmental safety and may sacrifice comfort
Solution Approach 1:
The patent uses a composite structure where an environmentally safe fabric (such as canvas) is combined with a protective plastic coating. This allows the base fabric to remain environmentally safe while the coating provides the necessary wear resistance, avoiding the need to switch to non-environmentally safe materials like vinyl.
Solution Approach 2:
The patent applies the plastic coating only in specific areas where wear occurs, such as along the fold lines and contact areas with slats. This localized application provides wear resistance exactly where needed while keeping the rest of the fabric environmentally safe and comfortable, rather than requiring complete material replacement.
3Reliability
If a hinge other than a living hinge is used, then wear resistance may improve, but the chair's simplicity and lightweight characteristics are compromised
Solution Approach 1:
The patent enhances the living hinge by applying a plastic coating or laminate to the fabric along the hinge line. This composite reinforcement allows the simple living hinge structure to withstand repeated folding and abrasive movements without introducing complex mechanical hinge components, maintaining both simplicity and durability.
Solution Approach 2:
The plastic coating acts as a protective layer that cushions and protects the fabric hinge area from wear before damage occurs. This preventive measure allows the simple living hinge to function reliably throughout the chair's lifecycle without requiring complex reinforcement structures.
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 solution significantly increases the lifespan of the chair's fabric by cushioning the slats against the foam rather than canvas, maintaining comfort and the calming effect for special needs children while withstanding their unique usage without increasing production complexity or costs.
Implementation Method 1
a fold line hinge into the fabric material which normally wears out over time is reinforced to prevent such early wear outs with a closed cell foam material, preferably a closed cell polyolefin strip
Data Source
AI summary
A collapsible and foldable composite chair with back slats and seat slats held together by a fabric material. A fold line hinge into the fabric material which normally wears out over time is reinforced to prevent such early wear outs with a cell foam material, preferably a closed cell polyolefin strip. As a result the slats do not wear though the slat pockets in the material and the fold line hinge endures.