Protective insole insert for footwear
OwnerRobert D. Yant, Richard I. Polisnerinventors
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Abstract
A puncture proof insole insert formed of multiple layers of flexible metal sheets, the insert being capable of stopping penetration by a sharp object at forces up to 60 foot pounds in the ball area of the foot and up to 80 foot pounds in the heel area of the foot, there being a greater number of metal sheets in the heel area than in the ball area. The device may further incorporate cushioning or fabric layers, and may be formed with a raised arch or other orthotic shape. The device is preferably constructed of layers of 17-7 stainless steel with each layer having a thickness of 0.015 inches.
Claims19
An insole insert for footwear having a heel portion, an arch portion, a ball portion and a toe portion, said insert comprising multiple layers of flexible metal sheet members, said sheet members having a combined resistance to puncture such that said sheet members are puncture proof to sharp objects at forces up to 60 foot pounds in said ball portion and up to 80 foot pounds in said heel portion, where said sheet members comprise two full sheet members covering said heel, arch, ball and toe portions, and one heel member covering only said heel area, where each of said sheet members has a tensile strength greater than 200,000 psi, a yield strength at 0.2% offset in excess of 175,000 psi, and elongation in 2 inches of 1% and a hardness of at least 41 HRC.
An insole insert for footwear having a heel portion, an arch portion, a ball portion and a toe portion, said insert consisting essentially of three layers of flexible metal sheet members, said sheet members having a combined resistance to puncture such that said sheet members are puncture proof to sharp objects at forces up to 60 foot pounds in said ball portion and up to 80 foot pounds in said heel portion, where two of said sheet members are full sheet members covering said heel, arch, ball and toe portions, and where one of said sheet members is a heel member covering only said heel area.
Dependencies are inferred from the claim text.