Fluid-Filled Cushion Chambers With Controlled Pressure Equalization
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Solution Overview
Problem
Fluid-filled cushions with unrestricted flow suffer from rapid and uneven fluid distribution under user weight, leading to poor support due to weak points in the seal between chambers, which can result in leaks and inconsistent pressure.
Innovation Solution
A cushion design featuring an upper and lower layer with a discrete pressure distributing unit, comprising a frame and fluid conduits that provide controlled fluid flow between chambers, reducing the likelihood of leaks and ensuring consistent pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chambers are connected by leaving a break in the seal, then fluid connection between chambers is achieved, but the seal creates weak points that increase likelihood of leaks
Solution Approach 1:
A discrete pressure distributing unit is introduced as an intermediary component between chambers. This unit includes a body with multiple apertures that provides controlled fluid connection while eliminating the need for breaks in the seal between chambers. The pressure distributing unit acts as a mediator that distributes fluid pressure evenly through its multiple apertures, preventing the weak points created by traditional seal breaks and significantly reducing leak risk.
2Reliability
If unrestricted fluid flow is allowed in single chamber cushions, then manufacturing simplicity is maintained, but rapid and uneven fluid distribution occurs under user weight
Solution Approach 1:
The cushion is divided into multiple separate chambers instead of using a single unrestricted chamber. Each chamber is sealed independently and connected through the discrete pressure distributing unit. This segmentation prevents rapid and uneven fluid distribution by confining fluid flow within defined chamber boundaries, while the pressure distributing unit ensures balanced pressure distribution across all chambers when weight is applied.
3Reliability
If aperture diameter varies with cushion pressure, then seal flexibility is maintained, but fluid distribution becomes uneven and support consistency deteriorates
Solution Approach 1:
The pressure distributing unit incorporates multiple apertures with specifically controlled dimensions that maintain consistent fluid distribution across varying pressure conditions. Rather than allowing aperture diameter to vary freely with pressure, the design uses fixed-dimensional apertures in the pressure distributing unit that regulate fluid flow to achieve uniform pressure distribution, ensuring consistent support regardless of cushion inflation level or user weight.
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 reliable and even fluid distribution, enhancing user support and comfort by maintaining consistent pressure across the cushion, even under varying user weights and fluid types, while minimizing the risk of leaks.
Implementation Method 1
the pressure distributing unit comprises a frame and one or more fluid conduits, the fluid conduits for enabling fluid to flow, preferably in a controlled fashion, between the first chamber and the second chamber
Implementation Method 2
the conduits of the pressure distributing unit are suitable to allow flow of a fluid, such as gas, gel or liquid between the chambers to equalise pressure
Data Source
AI summary
A fluid-fillable cushion comprises upper and lower layers, a first chamber and a second chamber and a discrete pressure distributing unit situated between the upper and lower layers, said pressure distributing unit providing a fluid connection between at least the first chamber and the second chamber. Such a cushion reduces leaks and allows controlled pressure equalisation between the chambers. Also disclosed is a process for making such cushions and seating products comprising such cushions.