Insulated Footwear Sole with Down-Filled Cavities
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Solution Overview
Problem
Footwear soles in cold weather conditions fail to adequately insulate against ground cold, leading to heat loss and discomfort, and lack flexibility and impact absorption, increasing pressure on the foot.
Innovation Solution
An insulated sole with cavities on its inner surface filled with down insulation, trapped by a membrane to create a thermal barrier, providing both insulation and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid sole structure is used, then structural strength is improved, but thermal insulation performance deteriorates
Solution Approach 1:
The sole is divided into multiple cavities that are filled with insulating material, creating a segmented structure that maintains structural integrity while improving thermal insulation performance
Solution Approach 2:
The sole incorporates porous insulating material within its structure, utilizing the trapped air pockets in the porous material to provide thermal insulation while maintaining the necessary structural strength
2Temperature
If down insulation is used, then thermal insulation performance is improved, but manufacturing difficulty increases
Solution Approach 1:
The sole is segmented into cavities that contain the down insulation, making it easier to manufacture by allowing precise placement and containment of the insulating material within defined spaces
Solution Approach 2:
The use of porous insulating material with controlled pore structure provides excellent thermal insulation while being more manageable during the manufacturing process compared to loose down
3Stability of the object's composition
If the sole is made stiff to resist deformation, then structural stability is improved, but impact absorption deteriorates
Solution Approach 1:
The sole structure is segmented into cavities filled with compressible insulating material, allowing the structure to maintain stability while absorbing impact forces through the compression of the insulating material
Solution Approach 2:
The porous insulating material provides both structural stability and impact absorption capabilities, as the porous structure can compress under impact while maintaining overall form
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 effectively buffers cold from the ground, enhances foot comfort, and provides better impact absorption and breathability, maintaining body heat while allowing for flexibility and reduced pressure on the foot.
Implementation Method 1
down insulation or a mixture thereof with a material having insulating properties is disposed in each of the cavities and a membrane is disposed over the cavities to trap the down insulation or a mixture thereof therein to provide a thermal insulating barrier
Data Source
AI summary
An insulated sole having down feather insulation held captive therein and method of fabrication is described. The sole is formed with open top end cavities in which there is disposed down feathers or mixtures thereof to capture and retain heat. A membrane seals the open top end of the cavities. The insulated sole is used in the fabrication of articles of footwear for use in cold weather climate to resist to the cold emanating from the ground to shield against heat loss from the wearer's feet.