Inflatable Structure with Dissimilar Materials for Variable Resistance
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Solution Overview
Problem
Existing inflatable structures, such as exercise platforms, are limited by being made of a single material, providing uniform resistance on both sides, which restricts the degree of difficulty and versatility in use.
Innovation Solution
Inflatable structures formed of dissimilar materials, where one side is a rigid thermoplastic with a textured surface and the other is a flexible plastic elastomer, connected by thermoforming, allowing for varying resistance levels and collapsibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single material is used for the entire inflatable structure, then the manufacturing process is simple and consistent, but the resistance and degree of difficulty are uniform on both sides, limiting versatility
Solution Approach 1:
The inflatable structure uses different materials for different sides: a rigid thermoplastic for one side providing higher resistance, and a flexible plastic elastomer for the other side providing lower resistance. This local differentiation of material properties allows the same device to offer varying degrees of difficulty depending on orientation, directly resolving the contradiction between versatility and complexity.
Solution Approach 2:
The invention combines two dissimilar materials (rigid thermoplastic and flexible plastic elastomer) into a single inflatable structure through thermoforming. This composite approach enables the structure to exhibit different mechanical properties on different sides, achieving resistance variation and enhanced versatility while maintaining a unified manufacturing process.
2Ease of operation
If a rigid material is used for the inflatable structure, then the structure provides stable resistance, but it cannot be easily collapsed for storage and transport
Solution Approach 1:
The flexible plastic elastomer side of the inflatable structure provides ease of collapse and portability, while the rigid thermoplastic side maintains structural stability during use. This local differentiation resolves the contradiction between collapsibility and structural strength by assigning different material properties to different functional requirements.
Solution Approach 2:
The inflatable structure transitions between inflated and collapsed states dynamically. When inflated, the rigid thermoplastic side provides structural stability; when deflated, the flexible plastic elastomer side enables easy collapse for storage and transport. This dynamic behavior resolves the contradiction between stability and collapsibility.
3Strength
If a flexible material is used for the inflatable structure, then the structure is easy to collapse and transport, but it cannot provide sufficient resistance and stability during use
Solution Approach 1:
The rigid thermoplastic side of the inflatable structure provides high resistance and structural stability during use, while the flexible plastic elastomer side enables easy collapse and portability. This local differentiation of material properties resolves the contradiction between strength and ease of operation by assigning different functions to different sides of the same structure.
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 use of dissimilar materials in inflatable structures provides different resistance levels depending on orientation, enhancing user experience and improving portability by allowing for adjustable difficulty and easy storage.
Implementation Method 1
heating the first and second sheets of material to a temperature above their glass transition temperature and below their melting point
Implementation Method 2
bonding the first and second sheets of material together in a mold having an opposed pair of cavities to form an inflatable structure
Data Source
AI summary
A method of thermoforming an inflatable structure of dissimilar materials includes the steps of providing a first sheet formed of a first material and a second sheet formed of a second material different than the first material, the second sheet being spaced from the first sheet, and a valve being positioned between the first and second sheets; heating the first and second sheets to a temperature above their glass transition temperature and below their melting point; bonding the first and second sheets together in a mold having an opposed pair of cavities to form an inflatable structure having a seal around a periphery thereof, the valve extending through the seal and being in fluid communication with an interior and exterior of the inflatable structure; and trimming excess material from the periphery of the inflatable structure.