Single-Piece Expandable File Folder With Scored Front Panel
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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 component assembly, 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 with score lines for folding, and side flaps secured with adhesive, allowing for expansion while maintaining a flat appearance and easy integration into filing systems.
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 front panel segments allow expansion while the back panel maintains a flat profile, resolving the contradiction between capacity and profile.
Solution Approach 2:
The expansion mechanism transitions from three-dimensional accordion pleats to a two-dimensional scoring system on the front panel. This dimensional change allows the folder to expand horizontally while maintaining a flat vertical profile that fits in filing cabinets.
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 component assembly
Solution Approach 1:
The front panel and back panel are merged into a single integrated structure with scoring lines that enable expansion. This eliminates the need for separate accordion pleat components and assembly operations, reducing fabrication costs while maintaining capacity.
Solution Approach 2:
The mechanical accordion pleat system is replaced with a scoring-based expansion mechanism. The scores allow the front panel to flex and expand without requiring complex mechanical components, simplifying manufacturing processes and reducing costs.
3Ease of manufacture
If non-accordion design is used to simplify fabrication, then the manufacturing cost decreases, but the folder capacity and functionality are limited
Solution Approach 1:
The front panel is designed with dynamic scoring lines that allow it to expand and contract as documents are inserted and removed. This dynamic capability provides folder capacity equivalent to accordion designs while maintaining the fabrication simplicity of flat-panel constructions.
Solution Approach 2:
The scoring lines on the front panel create parameter changes in the panel's structural properties, allowing it to transition between flat and expanded states. This enables the simple flat-panel construction to achieve the functionality of more complex accordion designs.
4Volume of moving object
If the folder is filled to capacity, then the maximum document storage is achieved, but the folder may expand outward and not fit into filing cabinets
Solution Approach 1:
The folder structure separates the expansion function (front panel) from the footprint function (back panel). The front panel segments can expand to accommodate maximum capacity while the back panel maintains a stationary, compact footprint that fits standard filing cabinet dimensions.
Data Source
AI summary
The file holder is closed on two or three sides and is made from a single one piece blank. The bottom corners of the file holder are reinforced to avoid popping out when filled to capacity. The blank may be used to make a file folder or a mailer.