Vehicle Seat Back Pocket Seam Layout for Load Distribution
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Solution Overview
Problem
Conventional vehicle seat back skins have pockets that concentrate force at the seam, leading to reduced strength and potential damage when objects are carried, as the force is primarily applied to the upper end of the seam.
Innovation Solution
A skin design for a vehicle seat back featuring a rear upper piece and a rear lower piece with a pocket portion that extends downwards, where the left, right, and lower end portions are sewn together to form a pocket with lateral and vertical seams, distributing the applied force and enhancing strength, while an interlining reinforces the opening and is hidden from view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pocket is formed by sewing the pocket piece to the rear surface piece, then the pocket can be created, but the force applied to the pocket concentrates at the upper end portion of the seam, reducing the pocket's strength
Solution Approach 1:
The rear surface piece is divided into an upper piece and a lower piece, with the pocket formed by their overlapping arrangement. The upper piece has a pocket portion that extends downward in front of the lower piece, and they are sewn together at multiple locations (left end, right end, and lower end of the pocket portion), distributing the stress across multiple seam locations rather than concentrating it at a single upper end seam.
2Strength
If the seam extends laterally from the pocket opening, then the force can be supported laterally, but the design complexity increases
Solution Approach 1:
The lateral seam that supports the pocket opening is merged with the seam that joins the upper piece and lower piece together. The seam extends laterally from the pocket opening and also serves as the joining seam between the two pieces, achieving both force support and piece connection through a single seam configuration.
Data Source
AI summary
A skin for a seat back of a vehicle seat includes a rear upper piece arranged on the upper rear surface of the seat back, and a rear lower piece arranged on the lower rear surface of the seat back. The rear upper piece has a rear upper piece pocket portion that extends downward in front of the rear lower piece. A left end portion, a right end portion, and a lower end portion of the rear upper piece pocket portion are sewn to the rear lower piece to form a pocket, and an opening of the pocket is formed between the upper end portion of the rear upper piece pocket portion and the rear lower piece. The rear upper piece and the rear lower piece are sewn together at a seam that extends laterally from the opening of the pocket.