Stair Step File Folder Uniform Pocket Depth
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Solution Overview
Problem
Traditional stair-step expandable file folders have pockets of varying depths, making it difficult to access documents stored in rear pockets compared to front pockets.
Innovation Solution
A stair-step file folder design featuring a unitary divider web insert with vertically oriented accordion folds and flanges that maintain a uniform pocket depth across all pockets, allowing for equal accessibility from the top edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If dividers extend by different amounts along the top edge to create a stair-step configuration, then all divider top edges are viewable simultaneously, but pockets at the rear become deeper and documents are more difficult to access
Solution Approach 1:
The patent introduces expandable gussets with accordion folds that allow the folder to dynamically adjust its configuration. The gussets enable the dividers to be positioned at different heights while maintaining uniform pocket depths, as the accordion folds compensate for the height differences through their expandable structure.
Solution Approach 2:
The patent changes the physical parameters of the pocket structure by using accordion folds with controlled expansion. The accordion folds are designed to maintain a consistent vertical distance from the top edge of each divider to the bottom of each pocket, regardless of the divider height variations, thus standardizing the accessible depth parameter.
2Device complexity
If traditional stair-step folders are manufactured with varying divider heights, then all pockets are visible, but uniform pocket depth cannot be achieved
Solution Approach 1:
The patent segments the folder structure into distinct components: dividers of varying heights, accordion folds, and gussets. This segmentation allows each component to perform its specific function - dividers provide visibility, while the accordion folds and gussets maintain uniform pocket depth through their expandable geometry.
Solution Approach 2:
The accordion folds act as an intermediary element between the dividers and the pocket bottoms. They mediate the relationship between varying divider heights and uniform pocket depths by absorbing the height differences through their folded structure, ensuring consistent accessible depth across all pockets.
3Loss of information
If dividers at the rear extend farther upward than those at the front, then all top edges are viewable, but rear pockets become deeper making document access difficult
Solution Approach 1:
The accordion folds provide a dynamic structure that adapts to the varying divider heights while maintaining consistent pocket depths. The folds expand and contract to compensate for the vertical offset between rear and front dividers, ensuring that the distance from each divider's top edge to its corresponding pocket bottom remains uniform.
Solution Approach 2:
The patent controls the geometric parameters of the accordion folds to maintain a constant vertical dimension for pocket accessibility. By carefully designing the fold geometry and expansion characteristics, the system achieves uniform pocket depth despite variations in divider heights, optimizing both visibility and accessibility parameters.
Data Source
AI summary
A stair-step, expandable file folder is disclosed, in which each pocket in the folder has the same depth, rather than the back pockets being deeper than the front pockets. The folder is formed from a unitary insert divider web. The divider is suspended above the floor of the folder by tabs which are affixed to the folder walls and by attachment to the inside from and back panels of the folder.