Flat-Fold Fitted Sheet with Retractable Elastic for Compact Storage
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Solution Overview
Problem
Traditional fitted sheets with elastic around the edges are difficult to fold into a compact flat form due to the elastic bunching up, making them hard to store efficiently.
Innovation Solution
A flat-fold fitted sheet design featuring a concave dodecagon shape with zippers, elastic bands, and non-elastic strings that allow the elastic to be drawn into casings for a flat form and easily secured when fitted, enabling easy folding and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic is added around the edges of a fitted sheet to achieve a snug fit, then the sheet fits the mattress better, but the sheet becomes difficult to fold into a flat compact form
Solution Approach 1:
The elastic is extracted from its traditional continuous edge placement and repositioned only to the corner regions of the sheet. This allows the majority of the sheet perimeter to remain free of elastic, enabling flat folding while maintaining snug fit through corner-based elastic tension.
Solution Approach 2:
The elastic containment is segmented into separate corner regions rather than being continuous along all edges. Each corner has its own elastic containment structure, allowing independent tensioning at corners while leaving the mid-edge regions flexible and foldable.
2Reliability
If elastic is placed around all four sides of the sheet, then the sheet maintains a snug fit, but the elastic bunches up and prevents flat folding
Solution Approach 1:
Elastic is removed from the mid-sections of all four sides and concentrated only in the corner regions. This extraction eliminates the bunching problem in the middle of edges while preserving the snug fit function at the corners where the sheet needs to conform to the mattress.
Solution Approach 2:
Instead of placing elastic continuously along edges as traditionally done, the invention inverts the approach by placing elastic only at discrete corner points. This inversion transforms the elastic distribution from a continuous problematic structure to a discrete corner-based system that enables flat folding.
3Ease of operation
If zippers are added to corners to enable flat folding, then the sheet can be folded compactly, but the device complexity increases
Solution Approach 1:
The elastic containment structures are nested within the corner zipper assemblies. The zippers serve dual purposes: enabling corner separation for flat folding and housing the elastic components. This nesting integrates multiple functions into a single structural element, reducing overall device complexity.
Solution Approach 2:
The corner zipper assemblies serve multiple functions simultaneously: they enable the sheet to fold flat by separating corners, contain the elastic to maintain snug fit, and provide structural reinforcement at the corners. This multi-functionality reduces the need for separate components, simplifying the overall device.
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 allows the sheet to fit snugly over a mattress while easily folding into a flat form, addressing the storage challenge of traditional fitted sheets by utilizing zippers and elastic management systems.
Implementation Method 1
at least one span of an elastic band threaded through each span of casing
Data Source
AI summary
Disclosed is a flat-fold fitted sheet with elastic around the entire perimeter, allowing it to fit snugly to the mattress yet fold easily in its open form. The flat fold fitted sheet includes a string attached to the elastic, which provides a means for releasing the elastic into the casing to achieve the flat form and a means of pulling the elastic out of the casing to resume the fitted form. In the fitted form, the elastic is tethered at the corners and excess string is wound around a spindle, which may be contained in a pocket when the sheet is in use. Zippers on each corner provide traditional pockets that fit snugly to the mattress when in the fitted form but enable the sheet to lay flat when in the open position. When both zippers and elastic are in the open position, the sheet lays completely flat and is therefore easy to fold and store.