Foamed Resin Skeleton Structure for Soft Touch and Compression Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resin foamed bodies struggle to maintain an improved sense of touch due to changes in compression and shearing rigidity when density is adjusted, making it difficult to provide consistent seating comfort.
Innovation Solution
A resin foamed body with a skeleton structure comprising bone parts and connection parts, where the bone parts have a constant cross-sectional area and a changing cross-sectional area section, with an average ratio of these areas between 0.15 and 0.5, allowing for reduced shearing rigidity while maintaining compression rigidity, enhancing the sense of touch and surface touch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the density of the resin foamed body is adjusted to improve seating comfort, then the compression rigidity changes, but the shearing rigidity also changes making it impossible to sufficiently improve the sense of touch
Solution Approach 1:
The bone parts are designed with non-uniform cross-sectional areas along their length, creating local variations in rigidity. The cross-sectional area gradually increases from the upper end to the lower end, allowing different sections to contribute differently to compression and shearing resistance, thereby improving the sense of touch while maintaining necessary structural strength
Solution Approach 2:
The patent optimizes the average value of the ratio of cross-sectional areas (A0/A1) of the bone parts to be 0.15 or more and less than 0.5. This parameter control allows the skeleton to achieve the desired balance between compression rigidity and shearing rigidity, improving the sense of touch without compromising overall structural integrity
2Strength
If the ratio of shearing rigidity to compression rigidity is reduced to improve the sense of touch, then the sense of touch improves, but the hardness of the resin foamed body decreases
Solution Approach 1:
The connection parts are designed with larger cross-sectional areas compared to the bone parts, creating localized reinforcement at critical joints. This allows the bone parts to have reduced rigidity for improved sense of touch while the connection parts maintain overall structural hardness through their larger cross-sections
Solution Approach 2:
The resin foamed body combines a skeleton structure with varying cross-sectional areas with the surrounding foam material. This composite structure allows the skeleton to provide the sense of touch through its tapered geometry while the foam matrix maintains the overall hardness and structural integrity of the cushion
3Strength
If the cross-sectional area of bone parts is reduced to improve the sense of touch, then the shearing rigidity decreases, but the compression rigidity is compromised
Solution Approach 1:
The patent specifies that the average value of the ratio of cross-sectional areas (A0/A1) should be 0.15 or more and less than 0.5. This optimized parameter range ensures that the bone parts have sufficiently small cross-sections to reduce shearing rigidity for improved sense of touch, while maintaining adequate compression rigidity through the gradual area increase along the bone length
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A resin foamed body 1 is a resin foamed body made of flexible resin, the resin foamed body entirely includes a skeleton part 2, the skeleton part includes a plurality of bone parts 2B and a plurality of connection parts 2J connecting end parts of a plurality of bone parts, and an average value AV(A0/A1) of a ratio AO/A1 of cross-sectional area A0 of a bone change part of each bone part at an edge 2B22 on a bone constant part side relative to cross-sectional area A1 of the bone change part at an edge 2B21 on the connection part side satisfies 0.15≤AVA0/A1<0.5.