Shoe Construction Stitch Pattern Design

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Solution Overview

Problem

Existing shoe constructions, such as welt and Opanka constructions, are costly and inefficient due to the number of manufacturing operations required, and they lack flexibility in design variations between different portions of the shoe.

Innovation Solution

A shoe construction method that uses an outsole with a lip extending around its periphery, where the upper is secured by a stitch pattern that varies in visibility and orientation, using aligned holes and threads to protect stitching from wear and abrasion, allowing for simpler and cost-effective manufacturing with adjustable design features.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If welt construction is used to secure the sole and upper together, then durability and aesthetic appeal are improved, but manufacturing cost and complexity increase due to multiple manufacturing operations

Engineering Contradiction:

ImprovedurabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes the welt component entirely from the shoe construction, replacing it with a direct attachment method where the upper is secured to the sole assembly without requiring a separate welt strip. This extraction of the welt eliminates the associated manufacturing operations while maintaining the structural integrity and durability of the shoe through alternative attachment mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent combines the functions of the upper attachment and sole assembly into a single integrated construction method. By merging the previously separate steps of attaching the upper to the insole and then the welt to the upper, the invention creates a streamlined process where these functions are accomplished in fewer integrated operations, reducing manufacturing complexity while preserving durability.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If welt construction is used to secure the sole and upper together, then durability is improved, but manufacturing cost increases due to multiple manufacturing operations

Engineering Contradiction:

ImprovedurabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs a universal attachment method that can be applied across different shoe designs and configurations without requiring the specialized welt construction process. This multi-functional approach allows the same basic attachment technique to serve various design needs, reducing manufacturing costs through standardization while maintaining durability across different applications.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If Opanka construction is used to secure the outsole to the upper, then manufacturing simplicity is improved, but flexibility in design variations between different portions of the shoe is reduced

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoiddesign flexibility

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent applies different attachment configurations to different portions of the shoe, allowing the upper to be secured to the outsole with varying stitch patterns and orientations in different regions. This local differentiation enables design flexibility in specific areas (such as the toe or heel) while maintaining the overall simplicity of the Opanka construction method, thus achieving both manufacturing ease and design adaptability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces dynamic variability into the attachment system by allowing the stitch pattern, orientation, and visibility to change based on the location on the shoe. This dynamic approach enables the construction to adapt to different design requirements in different portions of the shoe while maintaining a fundamentally simple manufacturing process based on the Opanka method.

Inventive Principle:

Principle #15Dynamics

4Shape

If stitching is exposed on the outside of the upper, then aesthetic appeal is improved, but the stitching becomes susceptible to wear and abrasion

Engineering Contradiction:

Improveaesthetic appealVSAvoidresistance to wear

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The patent introduces a channel or groove structure as an intermediary element that receives and protects the stitching. This channel acts as a mediator between the aesthetic requirement for visible stitching and the durability requirement for protected stitching, allowing the stitches to be visually apparent while physically shielded from direct contact with abrasive surfaces and environmental factors.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs the channel structure as a protective shell or covering that envelops the stitching. This thin-walled protective structure maintains the visual appeal of the stitching while providing a physical barrier against wear and abrasion, effectively creating a flexible protective layer that preserves both aesthetics and durability.

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS8141271B2Shoe with improved construction

Publication Date: 2012.03.27 COLUMBIA INSURANCE CO

AI summary

A shoe construction wherein the upper is secured to the outsole by a stitch, and the upper folds inwardly in a first portion of the shoe and outwardly in a second portion of the shoe. The stitch allows an upper row of the stitching to be visible on the outside of the upper in one portion of the shoe but not visible on the outside of the upper in a different portion of the shoe.