Footwear Sock Liner Fat Pad Containment
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Solution Overview
Problem
Existing footwear lacks an effective interface between the shoe and the foot, leading to discomfort due to the natural fat pad's inability to absorb shock and pressure effectively, especially as it thins with age.
Innovation Solution
A sock liner with a base layer and one or more intermediate layers, designed to shape and contain the fat pad, providing better cushioning and support by manipulating the fat pad's position under the foot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional flat insoles are used, then manufacturing is simple and cost is low, but foot comfort and shock absorption deteriorate due to inability to accommodate natural fat pad shape
Solution Approach 1:
The insole incorporates intermediate layers with varying thicknesses and material properties in specific regions (heel, midfoot, forefoot) to locally enhance cushioning and support where needed, while maintaining overall simplicity of the design
Solution Approach 2:
The invention transitions from a two-dimensional flat insole to a three-dimensional structure with intermediate layers that create vertical variation in thickness, allowing the fat pad to be contained and shaped in the lateral direction while maintaining vertical cushioning
2Adaptability or versatility
If the fat pad is allowed to squish freely under load, then natural movement is maintained, but shock absorption and pressure distribution deteriorate due to lateral expansion
Solution Approach 1:
The intermediate layers act as flexible containment structures that allow vertical compression of the fat pad while restricting lateral expansion, creating a controlled environment that maintains natural movement while improving shock absorption
Solution Approach 2:
The insole is divided into multiple layers (base layer, intermediate layers, top layer) with different material properties, allowing different regions of the fat pad to be contained and shaped differently based on local structural requirements
3Ease of operation
If multiple intermediate layers are added to shape the fat pad, then cushioning and support are improved, but device complexity increases
Solution Approach 1:
Intermediate layers are added only in specific regions where fat pad containment is needed, rather than uniformly across the entire insole, reducing overall complexity while maintaining localized support where required
Solution Approach 2:
The insole uses composite construction with a base layer, one or more intermediate layers of different material properties, and a top layer, combining materials with varying cushioning, support, and flexibility characteristics to achieve multiple functions simultaneously
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 sock liner enhances foot comfort by effectively containing and shaping the fat pad, improving cushioning and support across various foot regions, thereby addressing the issues of shock absorption and pressure distribution.
Implementation Method 1
an intermediate layer that may be embossed within certain boundaries defined by the base layer to provide softer areas more easily compressed per unit distance but resulting in equivalent net force and pressure when co-planar with the more-dense surroundings
Implementation Method 2
embossed regions 28 or long embossed portions 28 may exist, wherein the intermediate layer 26 is formed to be greater than surrounding lower surfaces 40 of the sock liner 10
Data Source
AI summary
A sock liner (fitting above an insole of an article of footwear) includes a base layer between a thinner top layer, typically fabric contacting a sock in a shoe, and an intermediate layer below for shaping. The intermediate layer is a tailored series of projections, each extending from the medial side toward the lateral side. Together, these contain locally the individual regions of the “fat pad,” extending along the underside of a foot, providing the natural cushioning of bones, muscles, tendons, and ligaments thereabove. The liner may provide flex, stiffness, lift, cushioning, or the like in areas of the heel, arch, metatarsals, and forefoot. The layup typically includes multiple layers of expanded polymer material (plastic or elastomeric foam). These may be cut, overlaid, embossed, debossed, or a combination, in or out of a mold, to locally alter density, thickness, softness, or stiffness.