Patent ID: 6205680
Filing Date: 2001-03-27
Classification: A43B

Abstract:
A self-ventilating footwear having a midsole, the footwear comprising:(a) a midsole insert nested in the midsole, wherein the midsole insert comprises a compression member and a top layer having an underside, wherein the top layer and the compression member define a displacement compartment;(b) a first check valve embedded in the top layer, wherein the first check valve comprises a hole through the top layer and a polymer film welded around the hole on the underside of the top layer, leaving an opening between the polymer film and the top layer; and(c) a second check valve embedded in the midsole insert,wherein when the underside of the top layer comes into contact with the compression member, the polymer film closes the hole of the first check valve and the air exits the displacement compartment through the second check valve, andwherein when the underside of the top layer separates from the compression member, fresh air enters the displacement compartment through the opening between the polymer film and the top layer.