Dual Midsole Footwear with Flexion Lines for Child Comfort
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Solution Overview
Problem
Conventional children's shoes are stiff and uncomfortable, particularly in the forefoot area, due to the placement of the midsole outside the foot-receiving chamber, which fails to provide adequate comfort and flexibility for young children's developing feet.
Innovation Solution
The design incorporates both interior and exterior midsole components with longitudinal and transverse flexion lines, allowing the interior midsole to be softer and more flexible, while the exterior midsole is positioned primarily in the rearfoot region, providing a comfortable and natural walking experience by allowing the foot to flex naturally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the midsole is placed outside the foot-receiving chamber (conventional design), then the shoe structure is simpler and easier to manufacture, but the forefoot area becomes stiff and uncomfortable for children
Solution Approach 1:
The midsole is divided into two separate components: an interior midsole component placed inside the foot-receiving chamber and an exterior midsole component placed outside. This segmentation allows the interior midsole to provide flexibility and comfort directly to the child's foot in the forefoot area, while the exterior midsole maintains structural support in the rearfoot region, resolving the contradiction between manufacturing simplicity and foot comfort.
Solution Approach 2:
The invention transitions from a single external midsole structure to a dual-component system that adds an internal dimension. The interior midsole component is positioned within the foot-receiving chamber, creating a new spatial arrangement that allows direct interaction with the child's foot, thereby improving comfort without completely abandoning the conventional external midsole structure.
2Reliability
If the midsole is made thicker for better shock absorption, then impact force attenuation improves, but the shoe becomes stiffer and less flexible in the forefoot area
Solution Approach 1:
The interior midsole component is specifically designed with varying thickness and material properties in different regions. The forefoot area incorporates softer, more flexible materials with appropriate thickness for comfort, while the rearfoot region maintains greater thickness for shock absorption. This local differentiation resolves the contradiction between overall impact attenuation and localized foot flexion capability.
Solution Approach 2:
By separating the midsole into interior and exterior components, each can be optimized for its specific function. The interior midsole focuses on providing flexibility and comfort where the child's foot directly contacts it, particularly in the forefoot area, while the exterior midsole provides additional shock absorption support, allowing each component to address different aspects of the contradiction.
3Strength
If the shoe structure is made stiffer for better structural support, then durability and support improve, but natural foot movement and flexion are restricted
Solution Approach 1:
The shoe structure implements different stiffness characteristics in different regions. The exterior midsole component and rearfoot area maintain higher stiffness for structural support and durability, while the interior midsole component in the forefoot area uses softer, more flexible materials that allow natural foot flexion and movement, resolving the contradiction between overall structural strength and localized flexion freedom.
Solution Approach 2:
The dual midsole component system allows the structure to be segmented into supportive and flexible zones. The exterior midsole provides the necessary structural backbone and durability, while the interior midsole component creates flexible zones that accommodate natural foot movement, particularly in the forefoot area where children need maximum freedom for developing foot muscles and bones.
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
This configuration enhances comfort and flexibility, particularly in the forefoot area, promoting natural foot movement and strengthening the feet of young children by allowing independent flexion of toes and metatarsal bones, mimicking a barefoot walking feel.
Implementation Method 1
the interior midsole component includes at least one longitudinal flexion line and at least one transverse flexion line
Data Source
AI summary
Articles of footwear having both interior and exterior midsole components may include: (a) an upper that at least in part defines an interior chamber; (b) an interior midsole component within the interior chamber, wherein, at a forefoot region, the interior midsole component includes a longitudinal flexion line and a plurality of transverse flexion lines; and (c) an exterior sole structure engaged with the upper. This exterior sole structure may include: (a) an exterior midsole component in a heel region of the article of footwear that does not extend under the forefoot region of the article of footwear and (b) an outsole component that extends under the forefoot region. If desired, the outsole component may extend under the exterior midsole component in the rearfoot region. The interior midsole component may include a plurality of pod elements separated from one another by the flexion lines.