Articulating Strobel With Polymeric Bladder for Footwear

The sole structure is segmented into multiple functional layers: an upper layer, a bladder layer with discrete cushioning elements, and a lower layer. This segmentation allows each layer to perform its specific function - the bladder layer provides flexibility and cushioning while the outer layers maintain structural stability.

The bladder elements are strategically positioned in specific regions of the sole, particularly in the forefoot area where flexibility and cushioning are most needed. This local placement allows the sole to be flexible where required while maintaining stability in other areas.

The patent uses a bladder system filled with fluid (air or liquid) to provide cushioning. The fluid compressibility allows the bladder to absorb impact forces effectively while maintaining a compact, low-profile structure. The bladder elements can be inflated to the required pressure to achieve adequate cushioning without excessive height.

The bladder elements are constructed as flexible, thin-walled structures that can compress and expand. These thin-film bladders provide adequate cushioning volume while minimizing the overall height of the sole structure, achieving a low-profile design.

Instead of a continuous full-length strobel, the patent uses discrete, segmented bladder elements positioned at specific locations. This segmentation provides support where the bladders are placed while allowing flexibility in the regions between them, particularly in the forefoot area.

The patent applies the strobel function partially rather than fully - using bladder elements only in specific regions where support is needed rather than implementing a continuous strobel across the entire sole length. This partial application maintains flexibility while providing targeted support.