Fitted sheet with improved gripping effect
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Solution Overview
Problem
Existing fitted sheets suffer from crumpling, poor corner gripping, and inadequate fit on mattresses of varying thicknesses, leading to aesthetic issues and deterioration after washing due to loose elastic bands.
Innovation Solution
A fitted sheet design featuring a top panel and side panels with integrated elastic bands and gripping elements, comprising horizontal elastic strips and inverted V-shaped elastic segments, which generate horizontal and vertical forces to enhance gripping and prevent crumpling and dog ear formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic bands are used to hold the fitted sheet on the mattress, then the sheet can be secured to the mattress, but the elastic bands loosen after several washes causing deterioration of fitting
Solution Approach 1:
The elastic band is divided into multiple segments: a first elastic band at the bottom perimeter and second elastic bands at each corner. Each elastic band is further divided into multiple elastic portions (e.g., four portions per band). This segmentation distributes the gripping force across multiple independent elements, so that if one portion loosens, others maintain the fitting stability.
Solution Approach 2:
Different regions of the fitted sheet are equipped with different elastic configurations tailored to local requirements. Corner regions have additional elastic bands and gripping elements with multiple elastic portions, while mid-sections have standard elastic bands. This localized enhancement provides stronger gripping where needed most (corners) without unnecessarily complicating the entire structure.
2Device complexity
If the fitted sheet uses conventional elastic bands only, then the structure is simple, but the sheet crumples and dog ears form at corners due to insufficient gripping
Solution Approach 1:
The corner gripping mechanism is segmented into multiple elastic portions (e.g., four portions per corner band) arranged radially around the corner. This segmentation allows each portion to independently conform to the mattress corner geometry, distributing the gripping force evenly and preventing concentration of stress that causes crumpling and dog ear formation.
Solution Approach 2:
The elastic bands at corners are configured to extend in multiple directions (e.g., four different directions for a rectangular mattress corner) rather than a single linear direction. This multi-dimensional arrangement allows the elastic structure to grip the corner from multiple angles simultaneously, effectively preventing the sheet from twisting or forming dog ears.
3Ease of manufacture
If the fitted sheet is designed for standard mattress thickness, then the structure is optimized for specific dimensions, but it does not accommodate mattresses of varying thicknesses
Solution Approach 1:
The elastic bands are designed with inherent elasticity and flexibility that allow them to dynamically adjust to different mattress thicknesses. The multiple elastic portions can stretch and compress independently, enabling the same fitted sheet structure to accommodate a range of mattress dimensions without requiring size-specific designs.
Solution Approach 2:
The elastic properties of the bands (elastic modulus, length, width) are selected to provide optimal gripping force across a range of mattress thicknesses. By carefully choosing elastic parameters, the sheet maintains effective gripping whether the mattress is thin or thick, eliminating the need for multiple size variants.
4Ease of manufacture
If conventional corner gripping is used, then the manufacturing process is simple, but poor gripping at corners leads to dog ears and seam ears formation
Solution Approach 1:
Each corner is equipped with multiple elastic portions (e.g., four portions per corner band) that can be independently attached to the sheet. This segmentation simplifies the attachment process compared to creating complex integrated corner structures, while significantly improving gripping effectiveness through distributed force application.
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 enhanced gripping elements improve the sheet's fit and stability, preventing crumpling and dog ear formation while accommodating mattresses of different thicknesses and maintaining performance after multiple washes.
Implementation Method 1
Each of the plurality of gripping elements (112) and the one or more elastic bands 110 exerts horizontal and vertical forces such that the resultant forces cause an increase in gripping effect
Data Source
AI summary
A fitted sheet and a gripping element integrable with fitted sheets is provided. The fitted sheet comprises an elastic band and a plurality of gripping elements secured to a surface of the fitted sheet. Each gripping element comprises a horizontal elastic strip and an inverted V shaped elastic segment attached to the horizontal elastic strip. At least two arms of the inverted V shaped segment are attachable diagonally along the surface of the sheet respectively. The horizontal elastic strip is extendable laterally along a surface of the fitted sheet. The resultant force generated by the elastic band and the plurality of gripping elements enhances gripping of the fitted sheet and prevents crumpling and dog ear formation during usage.