Patent ID: 6969046

Claim:
A venting mechanism comprising: a vent housing having an inner surface and an outer surface, a first opening and a second opening and a slideable piston disposed in said vent housing wherein said slideable piston comprises a first substantially annular chevron member so that an edge of said first substantially annular chevron member is in contact with said inner surface of said vent housing such that the inner portion of the vent housing is divided into a first part and a second part and wherein air cannot flow from one part to the other; and a second substantially annular chevron member so that an edge of said second substantially annular chevron member is in contact with said inner surface of said vent housing and so that a first position of said slideable piston in said vent housing prevents air from flowing between said first opening and said second opening of the vent housing and a second position of said slideable piston in said vent housing enables air to flow between said first opening to said second opening of the vent housing; wherein said vent housing comprises means for deforming said second substantially annular chevron member and located on said inner surface on the vent housing between said first and second opening.