Patent ID: 6079123
Filing Date: 2000-06-27
Classification: A43B

Abstract:
A self-ventilating insert having a front end and a rear end, comprising:(a) a pumping chamber having a wedge-shaped longitudinal cross-section tapering downward from the rear end towards the front end, and a lateral cross-section defined by a top surface, a bottom surface, a left elbow and a right elbow;(b) an internal air duct having a first end that is fluidly connected to the pumping chamber and a second end that is fluidly connected to a flange near the front end, wherein the internal air duct comprises a plurality of parallel channels;(c) an external air vent fluidly connected to the pumping chamber at an edge of the pumping chamber, wherein the external air vent extends laterally from the pumping chamber;(d) a first non-return valve fluidly connected to the internal air duct allowing air to flow through the internal air duct to the pumping chamber; and(e) a second non-return valve fluidly connected to the external air vent allowing air to flow from the pumping chamber to the external air vent,wherein the pumping chamber, the internal air duct, and the external air vent comprise a single molded air enclosure, said single molded air enclosure being symmetrical around a horizontal plane.