Multi-Section Sandal Strap Design for Secure Foot Fit
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Solution Overview
Problem
Conventional sandals fail to provide a natural walking or running experience due to undifferentiated straps that do not match the dimensions of the foot, leading to insecurity and discomfort, especially when the foot and ankle can separate from the sandal sole.
Innovation Solution
A sandal design featuring a strap with multiple sections made of different materials, including an elastic heel section, a buckle assembly for easy adjustment, and a secondary securement strap to prevent heel slippage, allowing for customizable fit and secure attachment to the foot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single undifferentiated strap is used to encircle the foot, then the sandal structure is simple, but the strap dimensions do not match different portions of the foot, causing insecurity and discomfort
Solution Approach 1:
The strap is divided into multiple sections with different dimensions and materials, including an elastic heel section and a non-elastic instep section, to match the varying requirements of different foot portions while maintaining overall structural simplicity
Solution Approach 2:
Different portions of the strap are designed with different properties: the heel section uses elastic material for flexibility and comfort, while the instep section uses non-elastic material for secure fit, allowing each section to optimize its function for the specific foot region it contacts
2Reliability
If multiple separate straps with buckles are used for different foot portions, then the fit can be precisely adjusted, but tightening the sandal becomes a complicated maneuver
Solution Approach 1:
Multiple strap sections that would traditionally require separate buckles are merged into a single integrated strap structure with one buckle, allowing the user to adjust the entire strap system simultaneously while maintaining differentiated sections for optimal fit at each foot portion
Solution Approach 2:
The single buckle assembly serves multiple functions by controlling the tension of the entire multi-section strap, enabling precise adjustment across different foot regions through one operational interface rather than requiring separate controls for each section
3Device complexity
If only a single strap is used, then the sandal structure is simple, but the foot and ankle can separate from the sole, causing the sandal to flop against the heel
Solution Approach 1:
The strap is segmented into distinct functional sections, including a heel section that specifically targets the heel area and an instep section for the top of the foot, creating multiple contact points that prevent sandal-foot separation while maintaining overall structural simplicity
Solution Approach 2:
The elastic heel section is specifically designed to accommodate the natural movement and shape of the heel, providing localized stability and preventing the sandal from flopping against the heel while the non-elastic instep section provides secure anchoring
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 design provides a secure, customizable, and comfortable fit by accommodating the natural shape and size variations of the foot, preventing slippage and enhancing the overall stability of the sandal during movement.
Implementation Method 1
a heel section adjacent to the front section, a final instep section adjacent to the heel section
Data Source
AI summary
A sandal including a sole having a front region and a back region and an interior side and an exterior side, having a first opening in or near the back region at the interior side and a second opening in or near the back region at the exterior side. A primary strap is threaded through the first opening, then looped around the back region, and threaded through the second opening, thereby defining a heel region of the primary strap between the first opening and the second opening. The sandal further includes an adjustable securement strap that attaches on one side to the interior side of the heel region of the primary strap and on the other side to the exterior side of the heel region of the primary strap.