Flexible Heel Counter Structure for Hands-Free Foot Entry

The heel counter is designed with dynamic characteristics, allowing it to deform elastically under the weight of the foot during insertion, and then return to its original rigid shape to provide structural support. This dynamic behavior resolves the contradiction by making the quarter temporarily flexible during insertion and then stable during wear.

The patent changes the physical state of the heel counter by selecting materials and designs that exhibit different stiffness characteristics under different loading conditions. The heel counter material is chosen to be sufficiently rigid under normal wear conditions but flexible enough to deform elastically under the concentrated load of foot insertion, thus resolving the contradiction between rigidity and flexibility.

The heel counter employs local quality by concentrating material thickness and rigidity specifically at the heel support region where it is most needed, while other portions of the quarter can be thinner and more flexible. This allows the product to achieve necessary strength without requiring uniformly thick construction, simplifying the molding process.

The patent utilizes composite material construction, combining materials with different properties to achieve the desired balance of strength and manufacturability. By using composite materials, the heel counter can achieve high strength-to-weight ratio and complex geometries that would be difficult to manufacture with single materials, thus resolving the contradiction between strength and ease of manufacture.