Self-Inflating Cushion Valve and Foam Structure for Adjustable Support
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Solution Overview
Problem
Existing inflatable cushions, including those used in chiropractic and orthopedic applications, often lack adjustability in firmness and provide inadequate support, as they tend to be either too bouncy or insufficiently supportive, and require manual rotation of air valves for inflation and deflation, which can be cumbersome, especially for users with limited dexterity or strength.
Innovation Solution
A self-inflatable cushion with an air-impermeable skin and a compressible foam core that expands to draw air into the chamber, allowing for adjustable firmness without manual rotation of the air valve, using a sealable air valve assembly that transitions between open and closed positions without manual rotation of the outer cylindrical wall, and incorporating visco-elastic foam for comfort and support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual rotation of air valve is used for inflation and deflation, then firmness adjustment is achieved, but ease of operation deteriorates for users with limited dexterity or strength
Solution Approach 1:
The cushion is designed to self-inflate through a one-way valve mechanism that automatically allows air intake when the cushion is placed on a surface, eliminating the need for manual pumping or rotation operations by the user. The deflation process also occurs automatically when the valve is triggered, providing self-service functionality.
Solution Approach 2:
The traditional mechanical rotation valve requiring manual torque application is replaced with a pressure-sensitive one-way valve system that responds automatically to pressure changes when the cushion is placed or removed from a surface, substituting complex mechanical operation with simpler pressure-based actuation.
2Strength
If inflatable cushion is made fully inflatable for firm support, then support capability is improved, but comfort deteriorates due to bouncy feel
Solution Approach 1:
The cushion incorporates a dual-density foam construction with a softer outer layer and a firmer inner core, creating a dynamically responsive structure that adapts to user weight and position. This layered foam system provides progressive support that feels comfortable rather than bouncy, while maintaining adequate support capability.
Solution Approach 2:
The cushion combines two different foam materials with distinct density and firmness characteristics - a softer outer foam layer for comfort and a firmer inner foam core for support - creating a composite structure that simultaneously achieves both comfort and support capabilities that neither material could provide alone.
3Ease of operation
If inflatable cushion is made under-inflated for comfort, then comfort is improved, but support capability deteriorates
Solution Approach 1:
The dual-density foam construction allows the cushion to maintain its structural integrity and support capability even when not fully inflated, as the firmer inner core provides inherent support. The softer outer layer ensures comfort contact, creating a system where partial inflation still delivers both comfort and adequate support.
Solution Approach 2:
The composite foam structure with softer outer layer and firmer inner core ensures that even when the cushion is partially inflated for comfort, the firmer inner material maintains sufficient support capability, preventing the trade-off between comfort and support that occurs in single-material inflatable cushions.
4Ease of operation
If self-inflation mechanism is implemented, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The complex manual pumping mechanism and rotation valve system are extracted and removed from the design. Instead, a simple one-way valve integrated into the cushion structure is used, which automatically opens when pressure is applied during placement, providing self-inflation without adding significant complexity.
Solution Approach 2:
The complex mechanical rotation valve and manual pump system are replaced with a simple pressure-sensitive one-way valve that uses the natural pressure changes occurring when the cushion is placed on a surface to trigger automatic inflation, significantly reducing mechanical complexity 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
The solution provides a cushion that can be easily adjusted for firmness and support, accommodating various user needs without the need for manual valve operation, enhancing comfort and usability, particularly for users with mobility or dexterity issues, and allowing for a range of firmness and support levels in a single cushion.
Implementation Method 1
an inflatable body, having an upper surface and a lower surface, said body including an air-impermeable skin defining a chamber, an elastic foam core within said chamber
Implementation Method 2
a sealable air valve assembly which transitions between a valve-open position and a valve-closed position without manual rotation of the outer cylindrical wall
Implementation Method 3
incorporating visco-elastic foam for comfort and support
Data Source
AI summary
An inflatable cushion including: an inflatable body, having an upper surface and a lower surface, said body including an air-impermeable skin defining a chamber, an elastic foam core within said chamber and a sealable air valve; and an external elastic foam layer substantially covering at least one of said upper and lower of surfaces; wherein: the foam core is formed of a foam having a density of between about 15 kg/m3 and about 35 kg/ma and a hardness of between about 25 newtons and about 45 newtons; and the foam layer is formed of a foam having a density of between about 35 kg/m3 and about 65 kg/m3 and a hardness of between about 35 newtons and about 95 newtons.