Patent ID: 6647645
Filing Date: 2003-11-18
Classification: A43B

Abstract:
A midsole structure of an athletic shoe comprising:a midsole having a heel portion, a midfoot portion and a forefoot portion, said midsole being formed of a soft elastic material and extending from a heel region to a forefoot region through a midfoot region of said shoe; and a corrugated sheet having a wavy corrugation and including a medial side portion comprising a first piece of material and a lateral side portion comprising a second piece of material, said corrugated sheet extending from said heel portion to said midfoot portion of said midsole; wherein a flexural rigidity of said medial side portion of said corrugated sheet is different from that of said lateral side portion of said corrugated sheet; and wherein a boundary line between said medial side portion and said lateral side portion of said corrugated sheet is defined along an edge of one of said pieces of material of said corrugated sheet meeting the other of said pieces of material, and said boundary line crosses a load transfer curve at said midfoot portion of said midsole during a portion of a shoe wearer's gait cycle, which begins with striking onto the ground from said heel region of said shoe and ends with toe-off from said forefoot region of said shoe.