Shoe with integral orthotic/propulsion plate
A shoe with an integral orthotic or propulsion plate is provided that includes a shoe defining an upper and a sole, and an orthotic or propulsion plate positioned between the upper of the shoe and the sole of the shoe. The orthotic or propulsion plate defines a toe platform region, a longitudinal arch pad region, and a heel region. In the absence of an applied force to the top surface of the orthotic or propulsion plate and with the sole of the shoe resting on a horizontal surface, the orthotic or propulsion plate bows upward in the longitudinal arch pad region relative to the toe platform region and the heel region. In response to a force being applied to the top surface of the orthotic or propulsion plate, the bowed longitudinal arch pad region flexes downward relative to the toe pad region and the heel region to load a first preload force in the orthotic or propulsion plate. In response to the heel region thereafter moving upward, the bowed longitudinal arch pad flexes upward and the first pre-load force is released to deliver a propulsive force to the top surface of the orthotic or propulsion plate; and the orthotic or propulsion plate flexes to define a flex angle β between the toe platform region and the longitudinal arch pad region and to load a second pre-load force into the orthotic or propulsion plate. In response to the toe platform region thereafter moving upward, the orthotic or propulsion plate returns from its flexed position to eliminate the flex angle β; and the second pre-load force is released to deliver a propulsive force to the top surface of the orthotic or propulsion plate.
1. A shoe with an integral orthotic or propulsion plate, comprising: (a) a shoe comprising an upper and a sole, and (b) an orthotic or propulsion plate positioned between the upper of the shoe and the sole of the shoe and configured to extend from a heel to toes of a wearer; the orthotic or propulsion plate comprising a plurality of pre-impregnated carbon fiber layers; the orthotic or propulsion plate comprising (i) a toe platform region having a ball region and a toe region forward of the ball region, (ii) a longitudinal arch region, and (iii) a heel region, and the orthotic or propulsion plate further defining (i) a top surface, and (ii) a bottom surface in contact with the sole of the shoe; wherein, in absence of an applied force to the top surface of the orthotic or propulsion plate and with the orthotic or propulsion plate resting on a flat surface, the bottom surface of the orthotic or propulsion plate bows upward in the longitudinal arch region relative to the toe platform region and the heel region, and a bottom toe region surface dips at a non-zero angle α from a bottom ball region surface such that only the toe region and heel region contact the horizontal surface in the absence of the applied force; and, wherein the plurality of pre-impregnated carbon fiber layers are positioned such that the orthotic or propulsion plate includes more pre-impregnated carbon fiber layers in the ball region to the heel region as compared to the toe region, thereby imparting greater stiffness in the ball region to the heel region as compared to the toe region.
2. The shoe assembly of claim 1 , wherein the non-zero angle α is 1° to about 25°.
3. The shoe assembly of claim 1 , wherein the pre-impregnated carbon fiber layers are incorporated into a woven cloth.
4. The shoe assembly of claim 1 , wherein the plurality of pre-impregnated carbon fibers are positioned such that the spring plate is 0.5 mm thicker in the heel region as compared to the toe region.