Seat Back Trim Cover Fastening Structure for Pocket Load Stability
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Solution Overview
Problem
Conventional seat-back trim cover assemblies with pockets suffer from deformation and disengagement of zipped portions when subjected to strong forces, such as when a passenger inserts large books or multiple items, leading to an undesirable aesthetic impairment of the seat back's outer appearance.
Innovation Solution
The trim cover assembly features a rear side with a first cover portion and a pair of second cover portions, each with free end regions, secured using male and female fastener elements made of hard synthetic resin, which are securely attached to the seat back frame, preventing deformation and maintaining the aesthetic integrity even under strong forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If zippers are used to engage the openable rear cover portion with the other rear cover portions, then the trim cover assembly can be easily opened and closed, but the zipped portions deform and disengage when subjected to strong forces
Solution Approach 1:
The rear cover portions are divided into multiple segments (openable rear cover portion and other rear cover portions) that can be independently positioned and secured. This segmentation allows the cover to be opened for padding insertion while maintaining structural integrity when closed.
Solution Approach 2:
Fastening elements act as intermediaries between the rear cover portions, providing a reliable mechanical connection that prevents deformation and disengagement under force while allowing easy operation when engaged.
2Ease of operation
If the openable rear cover portion is movable to allow wide opening, then foam padding can be easily inserted, but the cover portions are forcibly pulled and expanded when strong force is applied
Solution Approach 1:
The fastening elements are pre-positioned on the rear cover portions before assembly, ready to engage and secure the cover in the closed position. This preliminary preparation ensures that when the cover is closed, the fastening elements are already in place to prevent forced expansion.
Solution Approach 2:
The fastening elements serve as intermediary components that transfer and distribute applied forces across the cover structure, preventing localized stress concentration that would cause deformation or forced expansion of the cover portions.
3Reliability
If the trim cover assembly is securely attached to the seat back frame, then aesthetic appearance is maintained, but the fastener regions may deform under strong forces
Solution Approach 1:
The fastening elements are designed with specific local properties (hard synthetic resin material) that provide both secure attachment capability and resistance to deformation. This local quality enhancement at the fastener regions ensures they can maintain aesthetic appearance while withstanding applied forces.
Solution Approach 2:
The fastening elements are made of hard synthetic resin, which combines the benefits of rigid structural support with resistance to deformation. This composite material property allows the fasteners to securely attach the trim cover while maintaining their own structural integrity under load.
Data Source
AI summary
On a rear side of seat back, a trim cover assembly of the seat back includes an openable first cover portion disposed centrally thereof and a pair of second cover portions disposed on opposite sides of the first cover portion. A pair of female fastener assemblies are provided to two lateral ends of the first cover portion, respectively, and each comprises: an anchor element; a female fastener element; and a connecting element connected between the anchor and female fastener elements. The anchor element is securely engaged with a seat back frame, thereby neatly securing the two lateral ends of the first cover to the rear side of seat back. The male fastener element is securely engaged with the female fastener element, thereby neatly securing the two second cover portions to the rear side of seat back in alignment with the two lateral ends of the first cover portion.