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Integral insole with multiple areas of different resiliency and method of making the insole

a technology of insoles and resiliency, applied in the field of insoles, can solve the problems of eva foam lack of durability and breakage with each step, and achieve the effect of providing resiliency and comfor

Inactive Publication Date: 2011-03-31
BDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The insole includes a body portion that is molded from a mixture of polyurethane and granulated cork. The body portion defines a metatarsal opening that extends completely through the body portion. A soft medical grade silicone insert is assembled to the metatarsal opening to provide resiliency and comfort for the metatarsal portion of a wearer's foot. The body portion constrains and stabilizes the silicone insert. A heel area referred to as the heel pod is molded from an elastomer material below a heel area of the body portion. The heel pod does not extend through the body portion, but is attached in a layered arrangement. A fabric cover layer is bonded to the top surface of the body portion and is cut away when the metatarsal opening is cut into the body portion. An interchangeable or removable arch support may be attached to the body portion to permit the insole to be adapted for use by persons having various foot arch heights.

Problems solved by technology

One problem with this type of material is that the EVA foam lacks durability and breaks down with each step.

Method used

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  • Integral insole with multiple areas of different resiliency and method of making the insole
  • Integral insole with multiple areas of different resiliency and method of making the insole
  • Integral insole with multiple areas of different resiliency and method of making the insole

Examples

Experimental program
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Embodiment Construction

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[0030]Referring to FIG. 1, a insole 10 is illustrated with its component parts separated from the insole 10. Insole 10 includes a body portion 12 that is formed of a mixture of polyurethane and granulated cork particles. It should be understood that the body portion may be formed from another mixture of material that offers similar resiliency and strength characteristics. The body portion 12 in the illustrated exemplary embodiment is made from a polyurethane foam or elastomer having a hardness in the range of 20 to 50 on the Shore A scale. More specifically, the hardness range may be between 25 and 36 on the Shore A scale with the optimum hardness believed to be about 30 on the Shore A scale. The polyurethane foam is a two-part polyurethane including polyol and isocyanate and a blowing agent that are blended with granulated cork particles that increase the hardness of the mixture after curing. The granulated cork particles are preferably 14 / 30 mesh granulated cork. The hardness of ...

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PUM

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Abstract

An insole for a shoe includes a body that is configured to fit within the shoe. A heel recess in a heel area of the insole extends partially through the body. A metatarsal opening in a metatarsal area of the insole extends completely through the body. A heel insert is secured in the heel recess, and a metatarsal insert is secured in the metatarsal opening. A method is disclosed for making an insole by mixing a reactive resin with a quantity of cork particles to form a body mixture. The mixture is injected into an injection mold to form a body portion of the insole that includes a heel recess and metatarsal opening. A heel insert and metatarsal insert are molded and provided in the heel recess and metatarsal opening, respectively.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. provisional Application No. 61 / 245,701 filed Sep. 25, 2009.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to insoles for shoes that are inserted in a shoe on top of a built-in insole or would replace a removable insole of the shoe.[0004]2. Background Art[0005]Shoes are generally constructed to include a sole and a built-in insole that is either cemented onto the sole of the shoe, or is removable. Insoles are inserted into shoes on top of the built-in insole or may replace the removable insole to provide additional cushioning and support in the shoe. Persons who may benefit from inserts may include runners, athletes, diabetics, and the like.[0006]Generally, insoles are formed in one piece of either foam or an elastomeric material. One example of a foam material commonly used in the manufacture of insoles is ethylene vinyl acetate (EVA) foam that uses...

Claims

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Application Information

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IPC IPC(8): A43B13/38A43B7/14
CPCA43B7/142A43B7/144A43B7/1445A43B17/02A43B7/148A43B7/149A43B17/003A43B7/1465A43B7/1464
Inventor GUTOWSKY, JR., LARRY A.THOMPSON, LORI A.
Owner BDG
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