Blast resistant structure

Claim 1

AN OVERPRESSURE PORT FOR USE IN AN EXPOSED PORTION OF A BUILDING PROVIDED WITH A GENERALLY RECTANGULAR CLOSURE MEMBER HAVING A PAIR OF SIDES SUBSTANTIALLY SHORTER THAN THE WIDTH OF A DOOR, AND HAVING LONGER SIDES; AND AXLE MEANS CONNECTING A MEMBER RIGIDLY ASSOCIATED WITH SAID BUILDING WITH ONE LONGER SIDE OF SAID CLOSURE MEMBER ALONG THE ENTIRE LENGTH THEREOF TO PROVIDE THE PRINCIPAL SUPPORT FOR THE SAME AND TO PROVIDE MEANS FOR DOUBLE ACTING PIVOTAL MOVEMENT; MEANS FOR EXCLUDING FALL-OUT OR THE LIKE COMPRISED OF COOPERATING WEATHERPROOFING MEANS ALONG AT LEAST THE LONGER SIDE OF THE CLOSURE MEMBER, OPPOSITE THE AXLE MEANS, AND ON THE SIDE OF THE PORT ADJACENT SAID LONGER SIDE; MEANS FOR RESTORING THE CLOSURE MEMBER TO SUBSTANTIALLY CLOSED POSITION; AND LATCH MEANS COMPRISED OF COOPERATING RIDER AND NOTCHED MEMBERS, AND SPRING MEANS ADAPTED TO PRESS ONE AGAINST THE OTHER, ONE COOPERATING MEMBER BEING ASSOCIATED WITH SAID BUILDING AND THE OTHER ASSOCIATED WITH THE CLOSURE MEMBER AND ADAPTED TO MOVE THEREWITH, THE COOPERATING MEMBERS RETAINING THE CLOSURE MEMBER CLOSED ONLY FOR PRESSURES WITHIN A PREDETERMINED CEILING OF THE ORDER OF 2 P.S.I WHEREBY TO PERMIT THE CLOSURE MEMBER TO OPEN UPON THE INCIDENCE OF A BLASE OF A NUCLEAR WEAPON OR OTHER SEVERE AIRBORNE DISTURBANCE.