Pocketed Spring Assembly With Built-In Edge Support Zones

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Solution Overview

Problem

Mattress manufacturers face high labor costs due to the need for custom foam encasements for pocketed spring assemblies, and there is a requirement for edge support with varying firmness zones and heavier gauge wire in specific areas, which existing technologies do not efficiently address.

Innovation Solution

A pocketed spring assembly with parallel strings of springs, where each string is joined to adjacent strings and optionally to a scrim sheet, featuring different gauge wire springs and geometries, allowing for splicing of sections to create zones of varying firmness and edge support, and a method to manufacture these assemblies with built-in edge supports on all sides.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If custom foam encasements are used for each pocketed spring assembly, then edge support and protection are provided, but labor costs and manufacturing complexity increase significantly

Engineering Contradiction:

Improveedge supportVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the edge support function from the separate foam encasement and integrates it directly into the pocketed spring assembly by forming edge support pockets with heavier gauge wire springs at the peripheral regions. This eliminates the need for separate foam encasements while maintaining the edge support function.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the edge support function with the pocketed spring assembly by integrating heavier gauge wire springs into the peripheral pockets of the assembly. This combines what were previously separate components (foam encasement and spring assembly) into a single unified structure.

Inventive Principle:

Principle #5Merging (Combining)

2Strength

If heavier gauge wire springs are used in edge support areas, then durability and edge support are improved, but manufacturing complexity increases due to varying spring specifications

Engineering Contradiction:

Improveedge support durabilityVSAvoidspring specification variety

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent applies local quality by using heavier gauge wire springs specifically in the peripheral edge support regions while maintaining standard gauge springs in the interior regions. This localized differentiation provides enhanced durability where needed without unnecessarily complicating the entire assembly.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent incorporates the heavier gauge wire springs for edge support during the initial manufacturing process of the pocketed spring assembly, rather than adding them separately later. This preliminary integration simplifies the overall manufacturing process despite the variety in spring specifications.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If foam encasements are constructed separately for different pocketed spring assembly sizes, then proper fit and protection are achieved, but labor costs and production time increase

Engineering Contradiction:

Improveencasement fitVSAvoidproduction efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent creates a universal pocketed spring assembly design where the integrated edge support structure serves multiple functions simultaneously: providing edge support, defining the assembly boundaries, and eliminating the need for separate encasements. This multi-functionality improves productivity while maintaining proper fit.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent segments the spring assembly into interior regions (standard gauge springs) and peripheral edge support regions (heavier gauge springs), allowing each section to be optimized for its specific function while maintaining a unified manufacturing process.

Inventive Principle:

Principle #1Segmentation

4Ease of manufacture

If pocketed spring assemblies are made with uniform spring gauge throughout, then manufacturing is simplified, but edge support and zone-specific firmness are compromised

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidedge support performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent implements local quality by differentiating spring gauge based on location: heavier gauge wire springs are used in peripheral edge support pockets while standard gauge springs are used in interior pockets. This localized differentiation maintains manufacturing simplicity while significantly improving edge support performance.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11109686B2Method of making a continuous string of pocketed springs

Publication Date: 2021.09.07 L & P PROPERTY MANAGEMENT CO

AI summary

A pocketed spring assembly comprises parallel strings, each string joined to at least one adjacent string. At least some of the strings have springs of different gauge wire and some of the pockets of the strings having springs of different gauge wire are spliced together. At least some of the strings have springs of different geometries and some of the pockets of the strings having springs of different geometries are spliced together. At least some strings may have end sections with springs different than a middle section therebetween, the springs of the end sections being firmer than the springs of the middle section.