Athletic shoes with reverse slope construction
First Claim
1. A running, jumping and braking athletic shoe comprising a horizontal outer sole and an inner sole thereabove, an upper attached to at least one of the outer sole and inner sole adjacent the periphery thereof, the inner sole elevated above the outer sole at a location defined by a ball of a foot being higher than the inner sole is elevated above the outer sole at a location defined by a heel of a foot to form a negative slope,the improvement comprising the inner sole negative slope being substantially flat laterally across the shoe and longitudinally from a heel location rearward of a location defined by the center of pressure at the heel of a foot at least to ball locations defined by the centers of pressure at the ball of a foot, said negative flat slope retained a proper negative substantially flat slope under the application of multiple times the weight of the user to the heel and ball centers of pressure, whereby the likelihood of excessive impact loading of the user'"'"'s arch is reduced and the arch protected.
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Accused Products
Abstract
New application of biomechanical principles of elastic stretch and braking force are combined in an athletic shoe. The new design implements the concepts by placing the heel significantly lower than the ball of the foot and toes. Tests show that an inner sole reverse slope of about 31/2° provides an optimum significant improvement in jumping in particular. The reverse slope is substantially flat from the center of pressure beneath the heel to the five centers of pressure beneath the ball of the foot. The flat slope provides more assurance that the weight of the user will be applied to the shoe through the centers of pressure in preference to locations under the arch. The invention is applicable to "explosive" movement sports such as basketball, track and field, volleyball, tennis and soccer. Preferably the shoes are constructed with formed or curved heels to retain the feet properly positioned in the shoes by preventing the feet from sliding too far back within the shoes. The increased athletic performance appears to arise from a two fold effect. First, the reverse slope because of the toe elevation additionally stretches the achilles tendon resulting in the ability to generate greater jumping force as the calf muscle contracts. Second, the reverse slope because of the continuous flat nature of the slope, provides a greater stopping or braking force, thus improving the ability to convert forward momentum into vertical or lateral motion.
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Citations
10 Claims
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1. A running, jumping and braking athletic shoe comprising a horizontal outer sole and an inner sole thereabove, an upper attached to at least one of the outer sole and inner sole adjacent the periphery thereof, the inner sole elevated above the outer sole at a location defined by a ball of a foot being higher than the inner sole is elevated above the outer sole at a location defined by a heel of a foot to form a negative slope,
the improvement comprising the inner sole negative slope being substantially flat laterally across the shoe and longitudinally from a heel location rearward of a location defined by the center of pressure at the heel of a foot at least to ball locations defined by the centers of pressure at the ball of a foot, said negative flat slope retained a proper negative substantially flat slope under the application of multiple times the weight of the user to the heel and ball centers of pressure, whereby the likelihood of excessive impact loading of the user'"'"'s arch is reduced and the arch protected.
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6. An athletic shoe for enhanced athletic performance comprising a sole with an outer surface, an inner surface and a periphery, an upper attached to the periphery,
said sole supporting the ball and toes of a foot above the heel of the foot relative to the outer surface at horizontal, said sole effectively increasing in thickness at a constant rate from a heel location rearward a location defined by the center of pressure at the heel of a foot to a ball location forward of a location defined by the forwardmost center of pressure at the ball of a foot to thereby form a flat inner negative slope, said flat inner negative slope extending laterally across the shoe, said flat inner negative slope retained a substantially flat proper negative slope under the application of multiple times the weight of the user to the heel and ball centers of pressure whereby the likelihood of excessive impact loading of the user'"'"'s arch is reduced, and the arch protected, and the inner surface forward of the flat inner negative slope being sloped at a lesser angle to horizontal than the slope of the flat inner negative slope.
Specification