Multi-Layer Trim Cover Assembly to Prevent Seat Sagging and Looseness
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Solution Overview
Problem
Existing vehicle seat assemblies face challenges in maintaining the integrity and appearance of trim cover assemblies over time, particularly due to sagging, bagginess, and looseness, especially when subjected to loads from seat occupant movement and seat functions.
Innovation Solution
A trim assembly design featuring multiple layers of trim materials, including a first trim layer with a seamless retaining member attached to a second trim layer via lamination, with the retaining member extending into grooves in the seat member, secured by fasteners, and optionally incorporating a third trim layer for enhanced stability and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer trim cover is used, then the manufacturing process is simple, but the trim cover sags and becomes loose over time under load
Solution Approach 1:
The patent applies composite materials by using multiple trim layers (first trim layer, second trim layer, and optionally third trim layer) with different properties. The first trim layer provides structural support, the second trim layer provides aesthetic appearance, and the third trim layer (when present) provides cushioning. This composite structure prevents sagging and maintains integrity under load while still being manufacturable through standardized lamination processes.
Solution Approach 2:
The patent segments the trim cover into multiple functional layers: a first trim layer attached to the seat member, a second trim layer attached to the first trim layer, and optionally a third trim layer between them. Each layer serves a specific function - structural support, aesthetic appearance, and cushioning respectively. This segmentation allows each layer to be optimized for its specific function while working together to prevent sagging.
2Strength
If retaining members are attached close to the edge of the trim layer, then the attachment strength is maximized, but the aesthetic appearance is compromised due to visible seams near edges
Solution Approach 1:
The patent uses the second trim layer as an intermediary between the first trim layer and the retaining members. The retaining members are attached to the second trim layer (which has aesthetic importance) rather than directly to the first trim layer (which provides structural support). This intermediary arrangement allows the retaining members to be positioned away from edges for aesthetic purposes while still maintaining attachment strength through the layered structure.
Solution Approach 2:
The patent applies local quality by making different parts of the trim assembly have different functions. The first trim layer provides structural support throughout, while the second trim layer provides aesthetic appearance at visible surfaces. The retaining members are strategically positioned away from edge regions where they would be visible, while still maintaining adequate attachment strength through the distributed layer structure.
3Reliability
If multiple trim layers are used, then the appearance and durability are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges multiple trim layers (first, second, and optionally third trim layers) into a single integrated trim cover assembly that functions as one unit. The layers are laminated together and attached to the seat member as a complete assembly, reducing the number of separate attachment operations needed and simplifying the overall manufacturing process despite the increased number of layers.
Solution Approach 2:
The patent applies preliminary action by pre-attaching the second trim layer to the first trim layer, and the third trim layer to the second trim layer, before final installation on the seat member. The retaining members are also pre-positioned away from edge regions in the layered structure. This preliminary preparation simplifies the final installation process and reduces on-site manufacturing complexity.
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
The design provides a durable and aesthetically pleasing trim cover assembly that conforms to the seat's shape and contour, preventing sagging and maintaining a smooth appearance over extended use, even under load conditions.
Implementation Method 1
A second trim layer is attached to the second surface of the first trim layer via lamination
Data Source
AI summary
The application relates to a seat assembly, a trim cover assembly, and a method of assembling. An assembly is provided with a seat member comprising a seating surface with a groove, a first trim layer, a second trim layer attached to the first trim layer, and one or more retaining members attached to the second trim layer. The second trim layer is positioned between the first trim layer and the one or more retaining members. The one or more retaining members are received within the groove, with the one or more retaining members connecting the first trim layer to the seat member. A trim cover assembly, and a method are also provided. In various non-limiting examples, the trim assembly may provide the desired shape of the seat, maintain durability and appearance, prevent looseness, and conceal the attachment of the retaining member.