Patent ID: 6585582
Filing Date: 2003-07-01
Classification: B60H,B63B,F24F,Y10S

Abstract:
A vent forming attachment for a flexible wall, said vent forming attachment being attachable to the wall at an opening in the wall, said attachment comprising:a first ring member having an axial center opening that is radially outwardly bounded by an axial nipple that is sized to fit into the opening in the wall; said nipple including a base, and external threads that extend axially from said base; and said first ring member including a first inner side surface that extends radially outwardly from the base of the nipple; and a second ring member having an axial center opening that includes internal threads that match and mate with the external threads on the nipple, and further having a second inner side surface that extends radially outwardly from the center opening in the second ring member; the first ring member being positionable with its nipple in the opening in the wall, and its inner side surface against a first side of the wall; and the second ring member being positionable with its inner side surface directed toward a second side of the wall opposite said first side of the wall, and being rotatable to cause its internal threads to threadedly engage the external threads on the nipple of the first ring member, so that the first and second ring members become connected together and a portion of the wall that immediately surrounds the opening in the wall is trapped by and between the two inner side surfaces of the two ring members; one of said ring members having projecting portions on the inner side surface thereof configured to be urged against said portion of the wall when the first and second ring members are connected together to trap said portion of the wall, to inhibit rotation of the attachment relative to the wall; and one of said ring members having a plurality of fins extending across its axial center opening to form a louvered opening, and a plurality of ribs perpendicular to said fins and extending between and interconnecting each pair of adjacent fins to strengthen said fins.