Importance

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Abstract

A system for stiffening the shank of an insole uses a stiffener which is formed from an initially flexible and deformable strip of thermosetting resin, preferably mixed with reinforcing fibers such as fiberglass. A length of such shank strip material is applied onto the bottom of an insole and the insole, with the shank strip in place, is mounted in a special fixture. The fixture holds the strip on the bottom of the insole and also assures that the insole and shank strip will be held in the proper configuration, with the proper bend at the ball and the arch. With the shank strip and insole so held an external stimulus, such as radiant heat, is applied to the shank strip to activate and cure it in place on the insole bottom. The fixture may be adjusted to provide precisely repeatable control over the curvature of the insole either to assure that the insole conforms precisely to the bottom of a particular last or to modify the curve at the insole bottom and configuration of the shank to suit any particular requirement of the manufacturer.

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First Claim