3D-Printed Modular Sole Assembly With Adhesive-Free Locking
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Solution Overview
Problem
Conventional footwear assembly is labor-intensive and costly due to the large number of components requiring assembly, finishing, and management, necessitating a more efficient and cost-effective modular sole assembly.
Innovation Solution
A footwear assembly with a modular sole assembly made via 3-D printing, utilizing adhesive-free locking features to connect insole, midsole, and outsole components, allowing for easy disassembly and recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional footwear is assembled by bonding multiple separate layers together, then the footwear provides structural integrity and durability, but the assembly process becomes labor intensive and costly
Solution Approach 1:
The patent combines multiple separate sole layers (insole, midsole, outsole) into a single integrated 3-D printed sole assembly. This merging eliminates the need for bonding multiple layers together, reducing assembly complexity while maintaining structural integrity through the monolithic printed structure.
Solution Approach 2:
The 3-D printed sole assembly serves multiple functions simultaneously: it provides structural support, cushioning, and ground engagement in a single integrated component. This multi-functionality replaces the need for separate bonded layers, simplifying manufacturing while maintaining durability.
2Adaptability or versatility
If conventional footwear uses multiple separate components, then the footwear can be designed with specialized functions for each layer, but the parts inventory that must be managed increases
Solution Approach 1:
The patent merges multiple functionally specialized layers into a single 3-D printed sole assembly. This integration reduces the quantity of separate parts that need to be managed in inventory while preserving functional specialization through varying material properties and internal structures within the printed component.
Solution Approach 2:
The integrated sole assembly incorporates multiple functions (cushioning, support, traction) within a single component. This universality reduces parts inventory requirements while maintaining the adaptability and versatility of having specialized functional zones throughout the sole.
3Reliability
If conventional footwear is assembled with many components, then the footwear can be optimized for specific performance characteristics, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple components into a single 3-D printed sole assembly, reducing manufacturing steps and associated costs. The integration maintains performance optimization capabilities through design flexibility in the printed structure, eliminating the need for expensive assembly processes.
Solution Approach 2:
The 3-D printing process allows for parameter changes in material density, stiffness, and internal structure throughout the sole assembly. This enables performance optimization in different zones without requiring multiple separate components, reducing manufacturing complexity and cost while maintaining reliability.
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 reduces assembly complexity and cost while enabling quick assembly, refurbishment, and recycling of components, maintaining durability and comfort.
Implementation Method 1
The insole portion can have a compressible lattice configured for absorption of compressive loads from the wearer's foot
Data Source
AI summary
Footwear with a modular sole assembly having an insole portion connected to an upper. The insole portion can have a compressible lattice with interconnected laths to provide support for the wearer's foot. A midsole portion is connected to the insole portion and has a midsole perimeter portion that interfaces with the insole perimeter portion. The midsole portion is modularly affixed to the insole portion. An outsole portion is connected to the midsole portion. First locking features are integrally formed along the lower perimeter portion of the upper or along the insole perimeter portion. Second locking features are integrally formed along the midsole portion and configured to releasably mate with the first locking features and fixedly hold the midsole portion together with the insole portion and the upper without use of cement bonding or other adhesive material.