Fitted Mattress Covering With Reinforced Diagonal Elastic Corners
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Solution Overview
Problem
Existing fitted sheets with diagonally extending elastic bands face issues with durability and connection strength, particularly when subjected to abnormal use, leading to potential detachment and tearing, and require more economical and ergonomic designs that minimize material usage and wrinkle formation.
Innovation Solution
The design incorporates a fabric body with diagonally extending elastic bands secured using a stitching method that involves folding the bands between layers of fabric and elastic binding, ensuring they remain attached through supplementary securing means like secure stitches, even under heavy use, while using less material and providing a wrinkle-free fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional elastic bands are secured to fitted sheets using conventional stitching methods, then the sheets can be manufactured economically, but the bands may detach during abnormal use such as lifting mattresses
Solution Approach 1:
The elastic band ends are folded over and secured to the sheet before final assembly, creating pre-formed attachment points that are reinforced with bar tacks. This preliminary securing action ensures the bands remain attached during subsequent use and handling.
Solution Approach 2:
Supplementary securing means in the form of bar tacks are applied at the band attachment points before the product enters service. These bar tacks provide additional reinforcement that cushions against the abnormal forces encountered during mattress lifting, preventing band detachment.
2Strength
If strong elastic bands are used to ensure durability, then the bands resist tearing at intermediate points, but the bands may pull away from the sheet at attachment points under heavy loads
Solution Approach 1:
The sheet construction varies the quality and thickness of fabric at different locations. The lower edge portions where bands attach are constructed with additional fabric layers and reinforced stitching to provide localized strength exactly where the high forces are applied, rather than uniformly strengthening the entire sheet.
Solution Approach 2:
The attachment construction uses a composite structure combining multiple fabric layers, elastic binding material, and stitching elements. This composite approach creates a multi-layered attachment zone that distributes and resists the forces applied to the elastic bands more effectively than single-material constructions.
3Reliability
If additional material and reinforcement are added to secure elastic bands, then attachment strength improves, but material usage and manufacturing complexity increase
Solution Approach 1:
Reinforcement materials and additional stitching are applied only at the specific locations where elastic bands attach to the sheet, rather than uniformly throughout the entire sheet. This localized approach provides necessary strength at critical points while minimizing overall material consumption.
Solution Approach 2:
The construction merges multiple functions into integrated components. The lower edge portions serve both as structural elements of the sheet and as attachment zones for the elastic bands. The stitching that attaches the bands also serves to reinforce the edge construction, eliminating the need for separate reinforcement elements in some cases.
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 enhances the durability and attachment strength of elastic bands, preventing detachment during abnormal use, while reducing material usage and ensuring a snug, wrinkle-free fit on mattresses, thus providing a more economical and ergonomic fitted sheet solution.
Implementation Method 1
Such sheets typically employ an elastic binding at the lower edge of the sheets. For certain sheet designs, additional widthwise or diagonally extending elastic bands may be provided at the corners of the sheet. The elastic binding in conjunction with the elastic bands facilitates fitting of the sheet on mattresses of different sizes, and further eliminates wrinkles in the fitted sheet.
Data Source
AI summary
A fitted mattress covering for a mattress includes lower edge portions, which may be inverted J-shaped portions, mirror-image inverted J-shaped portions, portions that terminate at an end, or inverted U-shaped portions. The covering side and end portion lower edges may join one another to form a continuous lower edge of the covering. For the J-shaped portion, an elastic binding may be disposed under a downwards folded portion. The elastic binding may extend at least partially along the length of the lower edge of the covering. An elastic band may be disposed at each corner of the covering and extend diagonally across the associated corner and have opposite ends secured adjacent one of the side portions and adjacent one of the adjacent end portions, respectively. The bands may be secured in place by stitching and/or by supplementary securing means to ensure that the bands do not pull away from the covering.