Adjustable Center Post Sandal Assembly for Foot Fit
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Solution Overview
Problem
Conventional flip-flop or thong-type sandals often fail to fit correctly, leading to discomfort and blisters due to either looseness or tightness, as they do not accommodate varying foot shapes and sizes effectively.
Innovation Solution
The implementation of an adjustable center post assembly in sandals, which allows for the adjustment of the strap position and tension using flexible second straps and a hook-and-loop fastening system, ensuring a secure and comfortable fit for different foot types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed strap configuration is used in conventional sandals, then the structure is simple and easy to manufacture, but the fit is poor for varying foot shapes and sizes, causing discomfort and blisters
Solution Approach 1:
The patent applies the dynamics principle by making the center post assembly adjustable rather than fixed. The center post can be repositioned vertically along the strap, and the strap itself can be adjusted in tension and position, allowing the sandal to adapt dynamically to different foot shapes and sizes. This transforms a static structure into a dynamic one that can accommodate varying user needs.
Solution Approach 2:
The patent segments the center post assembly into separate adjustable components. The center post is detachable from the strap, allowing independent adjustment of each component. This segmentation enables the strap position, center post position, and tension to be optimized separately for each user's foot characteristics.
2Ease of operation
If the strap is made loose to accommodate thin feet, then comfort is improved for thin-footed wearers, but the foot slides forward and backward causing chafing and blisters
Solution Approach 1:
The patent implements feedback through the adjustable mechanism that allows users to sense and respond to fit conditions. Users can adjust the strap tension and center post position based on comfort feedback, optimizing the fit to prevent both excessive looseness (which causes sliding) and excessive tightness (which causes pressure points).
Solution Approach 2:
The patent applies parameter changes by allowing adjustment of multiple parameters including strap tension, strap vertical position, and center post position. These parameter adjustments enable the sandal to maintain optimal fit across different foot types, preventing the foot sliding that causes chafing while avoiding excessive tightness.
3Stability of the object's composition
If the strap is made tight to prevent foot sliding, then stability is improved, but chafing and blisters occur on the wearer's foot
Solution Approach 1:
The patent applies local quality by distributing the securing function across multiple adjustable points rather than a single fixed tight strap. The center post provides localized support between the toes, while the strap provides overall securing. This localized support system achieves foot stability without requiring excessive overall tension that would cause chafing and blisters.
Solution Approach 2:
The adjustable mechanism allows dynamic optimization of tension distribution. Users can adjust the strap and center post to achieve just enough tension for stability without excessive tightness, adapting the tension level to their specific comfort needs and preventing pressure-related discomfort.
4Ease of manufacture
If a single fixed strap design is used, then manufacturing is simple and cost-effective, but the sandal is uncomfortable for extended wear and unsuitable for most outdoor activities
Solution Approach 1:
The patent segments the assembly into detachable components (strap, center post, fastening elements) that can be manufactured separately using simple processes. This segmentation maintains manufacturing simplicity while enabling post-purchase adjustment and customization, making the sandal suitable for various outdoor activities and foot types.
Solution Approach 2:
The adjustable design allows the sandal to adapt to different activity requirements. Users can modify the strap tension and center post position based on activity demands, transforming a simple fixed design into a versatile system suitable for extended wear during various outdoor pursuits.
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 adjustable center post assembly provides a comfortable, secure, and customizable fit, reducing chafing and blisters by accommodating various foot shapes and sizes, enhancing comfort and stability during extended wear.
Implementation Method 1
a hook-and-loop fastening system
Data Source
AI summary
Sandals with adjustable post assemblies are disclosed herein. In one embodiment, a sandal can include a sole assembly and a first strap coupled to the sole assembly. The first strap is positioned to engage a forefoot area of a wearer's foot. The first strap includes an aperture proximate to an intermediate portion of the first strap. The sandal also includes an adjustable post assembly extending through the aperture. The post assembly includes a post portion coupled to the sole assembly and one or more flexible second straps projecting from the post portion and configured to be releasably coupled to the first strap. The first strap is movable along at least one of the post portion and the one or more flexible second straps to adjust the position of the first strap relative to the sole assembly for engagement with the wearer's foot.