Seat back
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing seat backs suffer from steps and seam line meandering at the joint between the back board and back pad due to deformation, leading to a deteriorated appearance.
Innovation Solution
The seat back design includes a back board with a peripheral edge projecting portion and a pad convex portion that bulges outward, with the back cover pressed down to deform the pad convex portion, ensuring it aligns with the projecting portion, and a back supporting portion to prevent excessive deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the back pad is provided on the back board, then the comfort and cushioning are improved, but a step occurs at the joint portion due to deformation of the back pad
Solution Approach 1:
The back pad is pre-formed with a convex portion that protrudes toward the back board before assembly. This preliminary shaping ensures that when the back cover is stretched and pressed down, the pad convex portion aligns precisely with the peripheral edge projecting portion, preventing step formation at the joint portion while maintaining comfort.
Solution Approach 2:
The back pad has different local characteristics: a convex portion that protrudes locally at the joint area to match the peripheral edge projecting portion, while the rest of the pad maintains its cushioning properties. This localized structural variation resolves the contradiction between comfort and smooth appearance at the joint.
2Area of stationary object
If the back cover is stretched to cover the back pad and back board, then the coverage and protection are improved, but seam line meandering occurs due to the step at the joint portion
Solution Approach 1:
The pad convex portion is pre-formed to protrude toward the back board, creating a preliminary alignment feature. When the back cover is stretched over this pre-formed structure, the cover is pressed down uniformly at the joint portion, preventing seam line meandering while maintaining full coverage area.
3Shape
If the pad convex portion is pressed down by the back cover, then the step at the joint portion is reduced, but excessive deformation may occur without support
Solution Approach 1:
The peripheral edge projecting portion of the back board acts as an intermediary structure between the pad convex portion and the back cover. It provides a stable reference surface that guides the pressing action, ensuring the pad convex portion deforms to the correct extent to eliminate steps without excessive deformation.
Solution Approach 2:
The back board's peripheral edge is designed to project and bend, creating a controlled geometric parameter change. This structured projection provides a stable form that controls the deformation parameter of the pad convex portion, preventing excessive deformation while achieving step reduction.
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
This design reduces steps and seam line meandering, maintaining a smooth appearance and proper stretching of the back cover, while supporting the pad convex portion to avoid excessive deformation.
Implementation Method 1
the back cover is placed over the pad convex portion and the peripheral edge projecting portion in a manner that the back cover is pressed down to deform the bulging of the pad convex portion
Data Source
AI summary
A seat back includes a back board, a back pad provided to be brought into contact with the back board, and a back cover to be placed over the back pad and the back board. The back board includes a peripheral edge projecting portion that projects to be bent from a peripheral edge of the back board toward the seat front side. The back pad includes a pad convex portion that bulges in a manner of projecting outward with respect to the peripheral edge projecting portion and that is to be brought into contact with the peripheral edge projecting portion from the seat front side, and the back cover is placed over the pad convex portion and the peripheral edge projecting portion in a manner that the back cover is pressed down to deform the bulging of the pad convex portion.