Expandable File Holder With Segmented Side Flaps
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Solution Overview
Problem
Existing expandable file folders with accordion pleats face issues such as pleats projecting beyond the folder plane, causing catching in filing cabinets and high fabrication costs due to separate production of pleats and sides, while non-accordion folders have limited capacity and functionality.
Innovation Solution
A single-piece expandable file folder design featuring a back panel, a front panel that folds over to create a pocket, and side flaps with adhesive means, allowing the folder to expand while maintaining a flat appearance and fitting into filing cabinets without protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If accordion pleats are used to increase capacity, then the folder can accommodate more documents, but the pleats project beyond the folder plane and catch on filing cabinets
Solution Approach 1:
The folder is divided into a back panel and a front panel that can move independently relative to each other. The side flaps are segmented into first sections attached to the back panel and second sections attached to the front panel, allowing differential movement that maintains a flat profile while accommodating expansion.
Solution Approach 2:
The invention transitions from the traditional accordion pleat structure that expands in the horizontal dimension to a vertical expansion mechanism where the front panel and back panel move relative to each other in the vertical dimension, allowing the folder to expand capacity while maintaining a flat horizontal profile.
2Volume of moving object
If accordion pleats are used to increase capacity, then the folder can accommodate more documents, but the fabrication cost increases due to separate production and assembly
Solution Approach 1:
The invention merges the side flaps and front panel into a single integrated structure that is formed as one piece from a blank sheet. This eliminates the need for separate production of accordion pleats and assembly operations, significantly reducing fabrication complexity and cost while maintaining the expansion function.
Solution Approach 2:
The single-piece construction serves multiple functions simultaneously: it provides the expanding capacity mechanism, the structural framework, and the closure system all in one integrated component, eliminating the need for separate parts and assembly operations.
3Ease of manufacture
If non-accordion design is used to simplify fabrication, then manufacturing cost decreases, but the folder capacity and functionality are limited
Solution Approach 1:
The invention introduces dynamic movement between the front panel and back panel through the side flaps mechanism. The first and second sections of the side flaps can move relative to each other, allowing the folder to expand its capacity dynamically while maintaining a simple single-piece construction that is easy to manufacture.
4Volume of moving object
If traditional expandable design is used to increase capacity, then the folder can hold more documents, but it cannot be readily fitted into standard filing cabinets
Solution Approach 1:
The invention maintains a flat profile when empty, creating an equipotential state where the folder fits smoothly into filing cabinets without protrusions. When documents are added, the front panel and back panel move relative to each other to accommodate the volume, then return to a flat configuration for storage, ensuring compatibility with standard filing cabinet spaces throughout the cycle.
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 solution enables a cost-effective, automated fabrication of a file folder that can be filled to capacity without expanding outward, ensuring smooth storage in filing cabinets and maintaining a flat profile, thus addressing the limitations of both accordion and non-accordion designs.
Implementation Method 1
Adhesive means secures the second section of each flap to the front panel
Data Source
AI summary
The blank for making a file folder or mailer has side flaps that have a tab at each end. One tab serves to reinforce a bottom corner of the file holder to avoid popping out when filled to capacity and the other tab is rounded for extending above the front panel.