Vehicle Seat Trim Assembly for Sag-Free Surface Anchoring

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Solution Overview

Problem

Existing vehicle seat assemblies face challenges in maintaining the desired shape and appearance of the trim cover due to sagging, bagginess, looseness, and tenting, particularly when the trim assembly extends over large surfaces without adequate anchoring.

Innovation Solution

A trim assembly design featuring multiple trim members, including a first trim member with a decorative pattern, a second trim member attached via unaligned joins, and a third trim member extending into grooves in the seat member for secure attachment, using fasteners to prevent sagging and maintain desired aesthetics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the trim assembly extends over large surfaces without adequate anchoring, then the coverage area is increased, but the trim cover sags and loses its desired shape and appearance

Engineering Contradiction:
Improvecoverage area of trim assemblyVSAvoidshape and appearance of trim cover
Core Design Contradiction:
Area of stationary objectVSShape

Solution Approach 1:

The trim assembly is divided into multiple trim members (first trim member, second trim member, third trim member) that are attached in sequence. This segmentation allows each trim member to be individually anchored to the seat member, providing adequate support across large surface areas while preventing sagging and maintaining the desired shape and appearance of the trim cover.

Inventive Principle:
Principle #1Segmentation

2Shape

If the first join is unaligned with the groove, then the decorative pattern is preserved, but the attachment strength is reduced

Engineering Contradiction:
Improvedecorative pattern of trim memberVSAvoidattachment strength of trim member
Core Design Contradiction:
ShapeVSStrength

Solution Approach 1:

The second trim member serves as an intermediary between the first trim member and the seat member. It is attached to the first trim member via a first join that preserves the decorative pattern, and then attached to the seat member via a second join that aligns with the groove to provide strong anchoring. This intermediary approach allows the decorative pattern to be preserved while maintaining adequate attachment strength through the groove alignment at the second join.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Stability of the object's composition

If multiple trim members are used to prevent sagging, then the structural support is improved, but the assembly complexity is increased

Engineering Contradiction:
Improvestructural support of trim assemblyVSAvoidnumber of trim members and joins
Core Design Contradiction:
Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The second trim member is attached to the first trim member at the same location where the first join is made, merging the attachment functions. This merging approach provides additional structural support to prevent sagging while minimizing the increase in assembly complexity by consolidating attachment points rather than creating separate, distributed joins throughout the trim assembly.

Inventive Principle:
Principle #5Merging (Combining)

Data Source

PatentUS12534005B2Seat assembly, trim cover assembly, and method of assembling
Publication Date: 2026.01.27 LEAR CORP
  • US12534005B2 patent drawing
  • US12534005B2 patent drawing
  • US12534005B2 patent drawing

AI summary

A trim assembly is provided with a first trim member having a first finished surface and a second surface opposite thereto, a second trim member in contact with the second surface of the first trim member and attached to the first trim member via a first join, and a third trim member in contact with the second trim member and attached to the second trim member via a second join, the second join unaligned with the first join. The third trim member extends outwardly from the second trim member to a distal end having a first retainer. An assembly with a seat member and a trim assembly, and a seat are provided. In various non-limiting examples, the trim assembly may provide the desired shape of the seat, maintain durability and appearance, prevent looseness, and allow for use of a common seat member with trim assemblies of various appearances.