Perimeter-Wrapped Foam Mattress for Ridge-Free Edge Support
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Solution Overview
Problem
Conventional foam mattresses with encasements suffer from uncomfortable ridges, flexibility leading to flattening, and staple failure due to the use of polyurethane foam, which breaks down over time and fails to provide a sturdy edge.
Innovation Solution
A mattress design where the foam core extends to the perimeter and is wrapped with non-woven, non-elastic fabric to maintain shape and prevent flattening, using micro-coil springs for added buoyancy and securing staples with non-woven fabric to prevent pullout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional foam encasements are used to provide lateral support and shape the mattress, then the mattress core is supported and corners are shaped, but dense uncomfortable ridges are created around the perimeter edge and the foam breaks down over time becoming softer
Solution Approach 1:
The patent changes the material parameters from dense polyurethane foam to a fabric cover with foam filling. This material substitution eliminates the density-related discomfort while maintaining structural support function. The fabric cover provides a softer surface that doesn't create uncomfortable ridges, yet the internal foam filling maintains the lateral support strength.
Solution Approach 2:
The patent uses a composite structure combining a fabric cover with internal foam filling. This composite approach allows the outer fabric layer to provide a comfortable surface without ridges, while the inner foam maintains the structural lateral support and corner shaping functions separately, resolving the contradiction between support strength and comfort.
2Strength
If polyurethane foam encasement is used to provide sturdy sitting edge, then edge support is improved, but the foam breaks down over time and fails to provide long-lasting support
Solution Approach 1:
The patent employs a composite construction with a durable fabric cover and internal foam filling. The fabric cover provides long-lasting structural integrity for the sitting edge, while the foam filling maintains the edge shape. This combination resolves the time-dependent degradation issue of pure polyurethane foam encasements.
Solution Approach 2:
The patent segments the encasement function into two parts: the fabric cover provides the durable outer shell and structural framework, while the foam filling provides the internal support and shape maintenance. This segmentation allows each component to optimize its specific function, with the fabric providing long-term durability for the sitting edge.
3Shape
If flexible foam encasement is used to shape the mattress, then the mattress can be formed, but the foam allows the core to spread under weight and flatten the mattress
Solution Approach 1:
The patent uses a fabric cover that acts as a flexible shell conforming to the mattress shape. This fabric shell provides the necessary shaping for corners and edges while maintaining flexibility, replacing the traditional foam encasement structure with a textile-based solution that achieves the same shaping function without the spreading problem.
Solution Approach 2:
The patent transitions from a three-dimensional foam block encasement to a two-dimensional fabric cover wrapped around the mattress. This dimensional change allows the cover to conform to and shape the mattress perimeter while the internal foam filling provides the structural stability to prevent core spreading, separating the shaping function from the structural support function.
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
Ensures long-lasting comfort with equal edge-to-edge support, prevents flattening, and secures staples effectively, even in adjustable beds, by using a non-woven fabric to compress and hold the foam core in place.
Implementation Method 1
The preferably non-woven fabric has no elasticity. This creates a strong perimeter for the mattress that prevents outward pressure against the sidewalls
Implementation Method 2
an optional layer of micro-coil springs to provide more buoyancy and springiness in the mattress
Data Source
AI summary
A mattress (22) having a foam core (8) completely extends to the perimeter edges of the mattress wherein side walls (15) of the foam core are compressed inward and held in place using a preferably non-woven strip of fabric (21) or similar non-elastic or non-stretchable material that is wrapped around the side walls of the foam core. A method of wrapping the foam core allows corners (5) of the foam core to be formed under the inward pressure of the non-woven fabric, thereby creating a strong perimeter for the mattress that prevents outward pressure against the sidewalls created by the downward pressure of an individual lying on the mattress from flattening of the mattress by providing more upward pushback against the individual. An optional layer of micro-coil springs (2a) may be located within the foam core to provide more buoyancy and springiness in the mattress.