Pocketed Spring Cushion With Dual-Density Fiber Support Retention
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Solution Overview
Problem
Traditional furniture cushions face challenges with polyurethane foam, including high cost, volatility, early loss of support, flammability, and difficulty in recycling, while spring cushions have higher fabrication costs and require multiple foam components, and fiber cushions lose loft over time.
Innovation Solution
A furniture cushion design featuring a matrix of interconnected pocketed springs surrounded by foam on three sides and wrapped with a dual-density polyester fiber pad, eliminating or minimizing polyurethane foam and reducing labor costs associated with coil cushion construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyurethane foam is used as the cushion core, then the cushion is easy to fabricate and has consistent density, but the cushion loses support characteristics quickly during its life cycle and foam cost has been rising significantly
Solution Approach 1:
The patent changes the fundamental parameter of the cushion core material from foam to coil spring construction. This transforms the support mechanism from foam's cellular structure to the mechanical properties of steel coils, which maintain support characteristics throughout their life cycle while enabling consistent manufacturing through standardized coil units.
Solution Approach 2:
The invention creates a composite cushion construction combining coil springs with fiber materials (polyester, polypropylene, or a blend). This composite approach integrates the support retention of coils with the comfort and insulation properties of fiber, resolving the contradiction between ease of manufacture and support retention.
2Reliability
If traditional spring cushion construction is used with multiple foam pieces, then support characteristics are retained throughout life cycle, but fabrication costs are higher due to requiring six pieces of foam to be cut and sub-assembled
Solution Approach 1:
The patent extracts and eliminates the foam components from traditional spring cushion construction, reducing from six foam pieces to a minimal or eliminated foam presence. The fiber material replaces foam's functions of insulation and comfort, simplifying fabrication while maintaining support retention through the coil core.
Solution Approach 2:
The invention applies fiber material specifically where foam traditionally provided insulation and comfort functions, while the coil spring provides the structural support. This localized material assignment optimizes each material's performance and reduces overall fabrication complexity.
3Stability of the object's composition
If foam is used as cushion material, then the cushion provides consistent density, but foam is the most flammable of cushion component choices and creates toxic and explosive gases when burning
Solution Approach 1:
The patent fundamentally changes the material composition parameter from foam to a combination of coil spring and fiber material. This substitution eliminates foam's flammability and toxic gas production while maintaining density consistency through the standardized coil construction and controlled fiber density.
Solution Approach 2:
The composite construction of coil spring with fiber material (polyester/polypropylene blend) replaces foam entirely, combining the structural stability of metal coils with the fire-resistant properties of synthetic fibers, thereby eliminating foam's harmful flammability characteristics while maintaining composition stability.
4Ease of manufacture
If foam is used in cushion construction, then the cushion is easy to manufacture, but foam scrap from the fabricating process is not fully recyclable and can only be shredded for use in low-value products
Solution Approach 1:
The patent extracts and removes foam from the cushion construction entirely, replacing it with coil springs and fiber materials. This elimination of foam resolves the recyclability issue, as metal coils and synthetic fibers are fully recyclable, converting what was a waste problem into a sustainable solution.
Solution Approach 2:
The invention enables full recovery and recycling of all cushion components. The coil springs can be recovered and reused, and the fiber materials are recyclable, eliminating the need to discard foam scrap that could only be downcycled into low-value products.
Data Source
AI summary
A furniture cushion comprises a matrix of interconnected pocketed springs, each spring of which is contained within a pocket of fabric. Foam at least partially surrounds the matrix. A fiber pad is wrapped bull-nose around the matrix so the pad overlies an upper surface of the matrix of pocketed springs, the fiber pad having a first layer in contact with the upper surface of the matrix of pocketed springs and a second layer in contact with the first layer, the first layer having a first density and said second layer having a second density, the first density being greater than the second density.