Segmented Sole Shank with Unidirectional Stop for Dance Footwear
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Solution Overview
Problem
Traditional pointe shoes face challenges in balancing stiffness and flexibility, leading to inadequate support during various foot flexions, and lack a mechanism to assist dancers in maintaining proper foot placement and body alignment, which can result in injuries.
Innovation Solution
A dance shoe design featuring a sole shank with a unidirectional stop and living hinges that locks during plantar flexion and facilitates dorsiflexion, providing support and flexibility through a range of foot movements, including en pointe positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the toe box and shank are made rigid to provide structural support for plantar flexion, then support during en pointe positions is improved, but flexibility for dorsiflexion and other foot movements is reduced
Solution Approach 1:
The shank is divided into multiple segments with hinges between them, allowing each segment to move independently. This segmentation enables the shank to provide rigid support when needed while allowing controlled flexibility for different foot positions, resolving the contradiction between structural support and adaptability.
Solution Approach 2:
The shank transitions from a static rigid structure to a dynamic structure with hinges that can change their mechanical properties. The hinges allow the shank to be rigid during plantar flexion (en pointe) while becoming flexible during dorsiflexion, adapting to the functional requirements of different dance positions.
2Reliability
If the shoe is made stiff to maintain proper foot alignment and prevent over-plantar flexion, then injury prevention is improved, but the shoe becomes vulnerable to degradation from breaking-in manipulations
Solution Approach 1:
The hinge mechanism is designed with inherent flexibility and stress-distribution features that cushion the impact of breaking-in manipulations. By anticipating the stress from bending and twisting during breaking-in, the hinge design prevents concentration of stress that would lead to degradation, while still providing the rigidity needed for injury prevention during dancing.
3Strength
If the shank extends across the entire midfoot to rearfoot region, then support during plantar flexion is improved, but flexibility and comfort during neutral and dorsiflexion positions are reduced
Solution Approach 1:
The shank is segmented with hinges positioned to provide support where needed while allowing movement in other areas. The segmentation enables the shank to extend across the midfoot for support during plantar flexion, while the hinges allow the rearfoot region to remain flexible for comfort during neutral and dorsiflexion positions.
Data Source
AI summary
A dance shoe having an upper and an underfoot portion, the underfoot portion includes a sole shank, consisting of a relatively rigid structure, extending longitudinally in the shoe over at least a forefoot portion of the shoe and at least partially over a midfoot portion. The sole shank has at least one hinge with a unidirectional stop disposed widthwise in the sole shank. The sole shank covers at least the forefoot portion of the underfoot area and it locks to support plantar flexion and hinges to facilitate dorsiflexion of the foot. To facilitate en pointe movements, the sole shank may be coupled to a rigid distal part of the shoe, such as a toe box. The inventive subject matter is also directed to dance shoes, as well as the sole shanks themselves, and to methods of making the sole shanks and using the sole shanks in assemblies.