Composite Mattress Encasement for Stable Edge Support
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Solution Overview
Problem
Current coil spring mattress constructions lack sufficient border support, leading to edge instability and potential sleeper roll-off due to natural movement and weight, as the existing all-foam encasements are not durable enough to maintain straight edges over time.
Innovation Solution
A multi-layer canvas-foam-canvas composite encasement is constructed using double-sided adhesive tape and conventional gluing, with a quilted and pre-stitched border assembly attached via braided thread, providing enhanced support and preventing edge shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an all-foam encasement is used, then the mattress construction is simpler, but the border support is insufficient and edges become unstable over time
Solution Approach 1:
The patent applies composite materials by combining canvas and foam layers to create a canvas-foam-canvas composite encasement. This composite structure provides enhanced border support and edge stability compared to all-foam encasements, while maintaining reasonable construction complexity. The canvas layers reinforce the foam core, preventing edge collapse and sleeper roll-off.
2Reliability
If a multi-layer canvas-foam-canvas composite encasement is used, then border support and edge stability are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The encasement is segmented into distinct layers (canvas-foam-canvas) with each layer serving a specific function. The foam layer provides cushioning while the canvas layers provide structural reinforcement. This segmentation allows for optimized performance of each component while maintaining a manageable construction process through systematic layering.
Solution Approach 2:
The patent changes the material parameters by introducing canvas layers with specific tensile strength and dimensional stability properties. This parameter change enhances the overall encasement performance, providing better edge support and preventing border assembly displacement while maintaining flexibility for manufacturing.
3Strength
If the border assembly is attached by stitching through foam layers, then the border is securely fastened, but the thread cuts into the foam due to sleeper weight and movement
Solution Approach 1:
The composite canvas-foam-canvas structure provides a dual-layer attachment system where stitches can be secured to the durable canvas layers rather than solely relying on the foam. This composite construction prevents thread cutting into the foam while maintaining strong border attachment, as the canvas layers distribute and bear the mechanical stress from sleeper weight and movement.
4Ease of manufacture
If conventional gluing methods are used for the all-foam encasement, then the manufacturing process is simpler, but the encasement lacks durability to maintain straight edges over time
Solution Approach 1:
The canvas-foam-canvas composite structure inherently provides durability through the reinforcement of canvas layers. This composite construction maintains straight edges over time by distributing mechanical stresses across multiple layers, preventing the edge collapse and deformation that occurs with simple all-foam encasements, even when using conventional gluing methods.
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 ensures straight edges and minimizes sleeper roll-off by providing additional border support, maintaining the mattress's structural integrity and comfort while being quicker and cleaner to manufacture.
Implementation Method 1
formed into a firm, but flexible and resilient unitary component of the mattress by means of a novel combination of double-sided adhesive tape and conventional gluing material
Implementation Method 2
The canvas layers prevent the mattress thread from cutting into the foam layers, which would otherwise occur due to the weight and movement of the sleeper on the mattress
Data Source
AI summary
A mattress assembly having a composite encasement surrounding a coil spring unit in which the composite encasement comprises alternating layers of canvas and foam, and in which a side border assembly of quilted material is attached to the exterior walls of the composite encasement by means of multiple, spaced, lines of stitching extending through the alternating layers of canvas and foam to firmly affix the side border assembly to the encasement.