Cushion body for sitting
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Solution Overview
Problem
Conventional cushion materials fail to adequately disperse body pressure across various body shapes, leading to discomfort and pain, especially due to insufficient deformation and high rigidity, which limits their ability to fit different users effectively.
Innovation Solution
A cushion body made of an expanded beads molded body with a curved base and side supporting portions that can bend and deform to support both the buttocks and thighs, providing a suitable reaction force and pressure distribution, characterized by a specific range of bending deflection and compressive stress to accommodate various body shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional flexible cushion materials are used, then the cushion easily deforms compressively to disperse body pressure, but the cushion may be unable to sink enough and abuts the bottom surface, strongly compressing areas around the ischial tuberosities and resulting in numbness or pain
Solution Approach 1:
The cushion body is divided into a base part and multiple side supporting portions that can independently deform. This segmentation allows different regions to provide different levels of support and deformation, preventing excessive compression at critical areas while maintaining overall support capability.
Solution Approach 2:
The side supporting portions are designed to dynamically deform outward by a load applied to the side supporting surfaces, adapting to the user's body shape and weight. This dynamic deformation capability allows the cushion to provide appropriate support without excessive compression, resolving the contradiction between support strength and comfort.
2Stability of the object's composition
If a plate-like molded base material with high rigidity is used, then the base material maintains structural stability, but it only enables slight deflection deformation within a limited range, making it difficult to fit the body shapes of many unspecified users with various body shapes
Solution Approach 1:
The cushion is segmented into a stable base part and flexible side supporting portions. The base part maintains structural stability while the side supporting portions provide the necessary deformation and adaptability to fit various body shapes, resolving the contradiction between stability and versatility.
Solution Approach 2:
Different parts of the cushion have different mechanical properties: the base part has high rigidity for stability, while the side supporting portions have lower rigidity for adaptability. This local differentiation of material properties allows the cushion to simultaneously achieve structural stability and body shape adaptability for unspecified users.
3Ease of operation
If conventional cushion materials are used, then the cushion provides basic comfort, but it fails to adequately disperse body pressure across various body shapes, leading to discomfort and pain
Solution Approach 1:
The side supporting portions dynamically deform outward in response to applied loads, adapting to different body shapes and weights. This dynamic behavior enables the cushion to effectively disperse body pressure across various body shapes, improving sitting comfort for a wide range of users.
Solution Approach 2:
The cushion is designed with specific mechanical parameters (bending deflection of 20mm at 10-150N load, compressive stress of 0.08-7MPa at 25% compression) that optimize its ability to disperse body pressure. These parameter specifications ensure the cushion provides adequate comfort and adaptability across various body shapes.
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 body effectively disperses body pressure and supports users in a proper posture, reducing discomfort and allowing for comfortable sitting over long periods, regardless of body shape or size.
Implementation Method 1
the side supporting portions can be bent and deformed outward by a load applied to the side supporting surfaces so as to support both left and right parts of the buttocks
Implementation Method 2
the expanded beads molded body shows a 25% compressive stress of 0.08 to 7 MPa when measured according to an operation described in JIS K 6767: 1999
Data Source
AI summary
A cushion body for sitting is provided which can offer good feeling of sitting even to many unspecified users of various body shapes and allow them to be seated more comfortably. A cushion body for sitting (1) includes: a base part (2) having a sitting surface (S1) formed of a curved surface that is curved concavely to support, from below, the buttocks of a seated person in a seated posture; and a pair of side supporting portions (3) each having a side supporting surface (S2) formed of a curved surface that is curved continuously from the sitting surface (S1) of the base part (2), where the pair of side supporting portions (3) project from sides of the base part (2) such that the side supporting portions (3) can be bent and deformed by a load applied to the side supporting surfaces (S2), so as to support both the left and right parts of the buttocks of the seated person in the seated posture.