Multi-Zone Foam Cushion Assembly for Hip Support Balance
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Solution Overview
Problem
Conventional seating cushions with uniform resistance to deformation can lead to discomfort and difficulty in adjusting position due to uneven compression under varying body weights, causing the hip area to sink deeper than the thigh area, resulting in uncomfortable upward pressure on the thighs.
Innovation Solution
A cushion assembly with a core layer comprising two foam members of different resilient deformation resistances, where the second member has a higher resistance than the first member, and both are covered by layers spanning transversely across the thickness direction, ensuring the hip area receives firmer support and the thigh area less pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cushion uses uniform compressible material throughout, then the manufacturing is simple and cost-effective, but the cushion deforms unevenly under varying body weights causing discomfort
Solution Approach 1:
The cushion is divided into multiple zones with different compressible materials: a first compressible material in the central area and a second compressible material in the forward area. This segmentation allows each zone to provide appropriate support for different body parts, resolving the contradiction between manufacturing simplicity and seating comfort.
Solution Approach 2:
Different areas of the cushion are assigned different material properties: the central area uses a first compressible material optimized for hip support, while the forward area uses a second compressible material optimized for thigh support. This local differentiation of material qualities enables the cushion to adapt to varying pressure requirements across different seating zones.
2Ease of operation
If the central area of the cushion is made softer to accommodate hip pressure, then hip comfort improves, but the forward area exerts excessive upward pressure on the thighs
Solution Approach 1:
The cushion is segmented into a first compressible material zone for the central area and a second compressible material zone for the forward area. This segmentation allows the central area to be softer for hip comfort while the forward area maintains appropriate firmness to prevent excessive upward pressure on the thighs.
Solution Approach 2:
The central area is assigned a first compressible material with properties optimized for accommodating hip pressure, while the forward area is assigned a second compressible material with properties optimized for providing gentle support without excessive upward pressure. This local quality differentiation resolves the harmful pressure effect on thighs.
3Stability of the object's composition
If the cushion material is made uniformly firm to maintain shape, then structural stability improves, but the cushion becomes uncomfortable for extended seating
Solution Approach 1:
The cushion is segmented into different material zones: the central area uses a first compressible material that maintains structural stability, while the forward area uses a second compressible material that provides comfort during extended seating. This segmentation allows the cushion to simultaneously achieve shape stability and extended comfort.
Solution Approach 2:
The central area is assigned a firmer first compressible material to maintain overall cushion shape and structural integrity, while the forward area is assigned a softer second compressible material to provide comfort during extended seating periods. This local quality differentiation resolves the contradiction between shape stability and extended comfort.
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 cushion assembly provides improved comfort and support by distributing weight loads effectively, allowing for easier sitting upright and movement, as the firmer central area prevents sagging and reduces pressure on the thighs, enhancing overall seating experience.
Implementation Method 1
cushions include one or more overlapping layers of compressible material... the cushion typically has a uniform resistance to resilient deformation
Data Source
AI summary
A cushion assembly defining a thickness direction comprises at least one covering layer and a core layer. The core layer comprises a first member and a second member. The covering layer spans continuously across both the first and second members in a direction generally transverse to the thickness direction, and the first member is disposed adjacent a forward area of the cushion assembly. The second member is disposed adjacent a back surface of the first member. The second member has a higher resistance to resilient deformation than the first member, and the first member has a higher resistance to resilient deformation than the at least one covering layer.