Individually Reactive Footwear Lugs Bonded to Midsole
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Solution Overview
Problem
Conventional sole assemblies in footwear are heavy due to a rubber sheet connecting traction lugs, limiting flexibility and traction on varying terrains, as the lugs are either static or rigid, reducing the overall surface area in contact with the ground, which impairs performance and balance.
Innovation Solution
A sole assembly with multiple separate, individually reactive lugs bonded to a compliant midsole, allowing lugs to extend for soft terrain traction and compress into deformation regions for hard terrain, enhancing overall ground contact and traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rubber sheet connects traction lugs in conventional sole assemblies, then the lugs are protected and structurally supported, but the overall weight of the footwear increases
Solution Approach 1:
The patent removes the heavy rubber sheet connecting the lugs and extracts only the essential function of lug support by bonding lugs directly to the midsole. This eliminates unnecessary material while maintaining structural integrity through direct midsole attachment.
Solution Approach 2:
The sole assembly is segmented into independent lugs bonded directly to the midsole, eliminating the continuous rubber sheet. This segmentation removes excess material between lugs while maintaining individual lug functionality and reducing overall weight.
2Strength
If a rubber sheet spans between individual lugs, then the midsole is protected from damage, but the outsole becomes rigid and less flexible
Solution Approach 1:
The continuous rubber sheet is removed, extracting only the essential protection function through selective reinforcement areas. This allows the midsole to remain flexible while providing targeted protection where needed.
Solution Approach 2:
The continuous sheet is segmented into discrete lug structures bonded to the midsole, allowing the midsole to flex between lugs while maintaining protection at contact points. This segmentation restores flexibility to the outsole.
3Stability of the object's composition
If the outsole sheet is rigid with lugs projecting from it, then the lugs maintain stable positioning, but the surface area contacting the terrain is reduced on hard surfaces
Solution Approach 1:
The lugs are designed to be elastic and capable of dynamic movement relative to the midsole. On hard terrain, lugs can compress and allow midsole contact; on soft terrain, lugs extend for maximum penetration. This dynamic behavior optimizes contact area across different terrains while maintaining lug stability through elastic recovery.
4Device complexity
If individual lugs are prevented from reacting independently due to rigid sheet connection, then the structure remains simple, but traction on varying terrains is impaired
Solution Approach 1:
Each lug is designed as an independent elastic element that can dynamically respond to terrain conditions. The lugs can independently compress, extend, and react to ground contact forces, enabling adaptive traction on varying terrains while maintaining relatively simple construction through direct midsole bonding.
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 provides improved traction and reduced weight by allowing lugs to dynamically adapt to different terrains, increasing the surface area in contact with the ground and enhancing user feedback and performance.
Implementation Method 1
the individual lugs can dynamically, independently compress into deformation regions of the midsole
Implementation Method 2
the individual lugs can remain extended and can contact that terrain to provide grip and traction
Data Source
AI summary
A footwear construction includes a sole assembly having a midsole of a first durometer and a plurality of separate, individually reactive lugs of a second, greater durometer bonded to the midsole. On soft terrain, the individual lugs can remain extended and can engage that terrain to provide grip and traction. On hard terrain, the individual lugs can independently compress into deformation regions of the midsole to enhance traction, so that the midsole also can optionally contact the terrain with portions of the lugs. The sole assembly can include a fabric embedded and encapsulated in the materials of the lugs and the midsole to mechanically bond the lugs to the midsole and impair delamination. The individual lugs can include caps extending into the midsole with voids filled with the midsole material to improve the lug securement. A related method of manufacture also is provided.