Seat Back Intermediate Board Design to Prevent Finger Entry
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Solution Overview
Problem
The existing seat back designs, such as those described in JP-A-2002-142913, have a concern where the peripheral edge of the back board can be pushed away by a finger, potentially allowing the finger to enter the inside of the seat back.
Innovation Solution
The seat back design incorporates a back board with a peripheral edge fitted to an intermediate board, which is interposed between the back pad and the back board, and a back cover placed over the back pad and intermediate board to prevent finger entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the peripheral edge of the back board is directly fitted to the back pad, then the structure is simple, but a finger can be pushed into the gap between the back board and back pad
Solution Approach 1:
An intermediate board is introduced between the back board and back pad to act as a mediator. The intermediate board has a first fitting portion that fits to the back board and a second fitting portion that fits to the back pad, creating an intermediate structure that prevents direct finger insertion into the gap while maintaining overall structural simplicity
Solution Approach 2:
The fitting structure is segmented into multiple parts: the back board, the intermediate board with its two distinct fitting portions, and the back pad. This segmentation allows the intermediate board to specifically address the finger safety issue at the interface between the back board and back pad without requiring complete redesign of the entire assembly
2Reliability
If the fitting portion is expanded to prevent finger entry, then safety is improved, but the aesthetic appearance and compactness are compromised
Solution Approach 1:
The intermediate board serves as a thin mediating structure that maintains the compact aesthetic appearance from the exterior while providing the necessary safety function. Its intermediate positioning allows it to prevent finger insertion without requiring expansion of the overall fitting portion dimensions
Solution Approach 2:
The intermediate board functions as a thin protective element that provides safety coverage without adding significant bulk or compromising the sleek appearance of the seat back assembly
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 configuration effectively prevents fingers from entering the inside of the seat back without expanding the fitting portion, ensuring safety and maintaining the aesthetic appearance of the seat back.
Implementation Method 1
a back pad that is disposed at a front side the back frame, is configured to supports the seated person, and has elasticity
Data Source
AI summary
A seat back includes a back board serving as a decorative plate on a rear side of the seat back, a back frame that is configured to support a seated person, a back pad that is disposed at a front side the back frame, is configured to supports the seated person, and has elasticity, an intermediate board that is interposed between a peripheral edge of the back pad and a peripheral edge of the back board, and a back cover that is disposed over the back pad and the intermediate board.