INSOLE WITH ANTI-FRETTING PROPERTIES Russian patent published in 2015 - IPC A43B17/00 

FIELD: personal use articles.

SUBSTANCE: in the insole, in the zone of the heads of metatarsal bones and the big toe, where maximum loads during repulsion occur, one cuts (from the front side of the insole) slots having an inclined surface creating conditions for nonslip of the foot relative to the insole. Such structure of the insole allows to use materials in friction couples of foot (sock) - insole with friction coefficient 40% less as compared to that in case of usage of a flat insole thus to eliminate negative consequences appearing in the process of flat insoles usage. For nonslip effect intensification the slots inclined surfaces are dishevelled.

EFFECT: improvement of insole structure where in the back push phase fretting-wear conditions do not take place; such conditions negatively affect the insole and cause foot chafing.

4 cl, 5 dwg, 1 tbl