Assembly Sandal Strap Layout for Multi-Zone Fit Adjustment
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Solution Overview
Problem
Existing assembly-type sandals lack the ability to adjust tightness at different areas of the foot, such as the width of the forefoot and thickness of the instep, and often require additional locking rings or fasteners, increasing manufacturing costs.
Innovation Solution
The sandals feature a shoe sole with detachable webbings and a strap that form slip knots, allowing for adjustable tightness by pulling straps towards the front and rear sides, and include a quick plug-in buckle or middle fastener for further adjustment, eliminating the need for additional parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If locking rings or fasteners are used to adjust strap tightness, then adjustment capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the locking rings or fasteners from the sandal structure, replacing them with a simplified strap system that achieves adjustment through continuous loops and friction-based holding mechanisms integrated into the webbing itself, thereby reducing part count and manufacturing cost while maintaining adjustment capability
Solution Approach 2:
The adjustment and locking functions are merged into a single integrated strap system where the strap itself serves both as the adjustable element and the locking mechanism through friction and knotting, eliminating the need for separate locking components
2Device complexity
If a single strap adjustment system is used, then device complexity is reduced, but adaptability to different foot areas decreases
Solution Approach 1:
The strap system is segmented into multiple independent adjustment zones along the sandal, with each zone having its own circular loop and friction-based control point, allowing separate adjustment of tightness at different foot areas (forefoot, instep, heel) while maintaining overall structural simplicity
Solution Approach 2:
Different sections of the strap are configured with varying loop sizes, webbing densities, and friction characteristics to provide locally optimized adjustment capabilities for different foot regions, with denser webbing and smaller loops in areas requiring precise adjustment and more flexible sections in areas requiring comfort
Data Source
AI summary
A kind of light sandals including a shoe sole, a front fixing member, at least two webbings, and a strap is provided. The webbings are arranged at a front surface of the shoe sole. Each of the webbings includes a circular belt at an upper end, and a front opening and a rear opening of the circular belt are respectively toward a front side and a rear side of the sandals. The strap forms a slip knot on the respective circular belts. When the slip knot is in a tightness adjustment state, a frontward strap and a backward strap respectively can be pulled continuously toward the front and the rear sides. When the slip knot is in a stop adjustment state, the frontward and the backward straps are respectively pulled tightly toward the front and the rear sides and secured on the corresponding circular belts.