Patent ID: 8074374
Filing Date: 2011-12-13
Classification: A43B

Abstract:
1. A shoe sole comprising: an insole having a plurality of vent holes on the front part; and an outsole comprising a heel comprising a cavity open to the top, a plurality of flexible support posts on the cavity, a lateral first check valve extending from the cavity to one side of the heel, and a flexible protrusion on the bottom of the heel; a cover releasably fitted on the cavity, the cover comprising a plurality of lengthwise grooves and a second check valve communicating with the grooves and the cavity; a plurality of spaced projections on the front part of the top of the outsole, a space below the front part of the insole with the projections being disposed therein; and a lengthwise, central channel communicating the grooves and the space; wherein in response to a wearer's foot stepping on the shoe sole the protrusion is compressed upward to compress both the cavity and the support posts, close the first check valve, and open the second check valve such that air within the cavity is adapted to expel to a sole of the foot via the second check valve, the grooves, the channel, the space, and the vent holes; and wherein in response to the wearer's foot lifting the shoe sole each of the protrusion, the cavity, and the support posts returns to its original shape with the first check valve being open and the second check valve being closed such that atmospheric air is adapted to draw into the cavity via the first check valve.