Removable Footwear Insert Maintaining Shape Without Shoe Tree Weight
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Solution Overview
Problem
Conventional shoe trees are expensive, cumbersome, and limited in their ability to maintain the shape and appearance of sneakers and casual footwear, leading to premature wear and frequent maintenance or replacement.
Innovation Solution
A removable, thin, and flexible insert with a convex shape that conforms to the shoe's interior, comprising a front end, middle area, and tongue end, made from moldable materials that can be worn without discomfort, providing breathability and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional shoe trees are used to maintain footwear shape, then the shape and appearance of footwear is preserved, but the device becomes expensive, cumbersome, and heavy
Solution Approach 1:
The patent replaces expensive, heavy traditional shoe trees with inexpensive, lightweight foam inserts that can be easily replaced. The foam material provides sufficient shape-maintaining functionality without the cost and weight penalties of traditional shoe trees, embodying the principle of using cheap, short-living objects to solve the problem.
Solution Approach 2:
The patent uses flexible foam material that can be compressed and inserted into the footwear, then expands to maintain the shoe's shape. This flexible, thin insert provides shape maintenance functionality while being lightweight and easy to handle, resolving the contradiction between shape preservation and weight.
2Shape
If traditional shoe trees are used to maintain footwear shape, then the shape and appearance of footwear is preserved, but the device becomes cumbersome and takes up storage space
Solution Approach 1:
The foam insert is designed to be nested within the footwear itself, utilizing the existing space inside the shoe. This eliminates the need for separate storage space for the shape-maintaining device, as the insert lives inside the shoe when not in use, embodying the nesting principle.
Solution Approach 2:
The thin, flexible foam insert requires minimal storage space and can be easily stored within the footwear or packaging, resolving the contradiction between shape maintenance and storage space requirements.
3Shape
If traditional shoe trees with spring mechanisms are used, then the shape and appearance of footwear is preserved, but the useful life is limited due to spring mechanism wear
Solution Approach 1:
The patent extracts and eliminates the problematic spring mechanism from the shoe tree design, using simple foam material that has no moving parts to wear out. This extends the useful life of the shape-maintaining device by removing the failure-prone mechanical components.
Solution Approach 2:
The foam insert is designed as a disposable or replaceable component with no mechanical parts to fail, providing indefinite useful life through simplicity rather than complex durable mechanisms, resolving the contradiction between shape maintenance and durability.
4Shape
If thick inserts are used to maintain footwear shape, then the shape and appearance is preserved, but discomfort is caused to the wearer during use
Solution Approach 1:
The foam insert is designed with varying thickness - thicker in areas where shape maintenance is critical (toe box, vamp) and thinner in areas that contact the wearer's foot. This local variation in thickness provides shape maintenance functionality while minimizing wearer discomfort, resolving the contradiction between shape preservation and comfort.
Data Source
AI summary
Disclosed is a readily removable molded insert for footwear, including dress or casual shoes and sneakers. The insert may be manufactured from a variety of resiliently compressible, semi-rigid, and/or resiliently deformable materials and is designed for the purpose of maintaining the general shape and appearance of the upper section of a shoe. Embodiments of the insert are specifically designed to adapt to and conform to the shape of footwear and also to adapt to the contour of a user's foot while the footwear is being worn. The insert may be further cut, trimmed, or separated to fit a range of shoe sizes, by use of perforations along the outer rim of certain embodiments of the insert. Another embodiment of the insert may remain adhesively attached to the inside of the shoe, or it may be removed and repositioned within the shoe, as necessary.