Blast doors and span track arrangement for guided missile launching system

Claim 1

IN A MISSILE WEAPON LAUNCHING SYSTEM, A LAUNCHER HAVING AT LEAST ONE TRACK MEMBER, A BALLISTICALLY ENCLOSED STRUCTURE HAVING AN OPENING THEREIN, A FEEDER SYSTEM LOCATED IN SAID BALLISTICALLY ENCLOSED STRUCTURE AND SPACED FROM SAID LAUNCHER AND HAVING AT LEAST ONE TRACK MEMBER, A BASCULE TYPE DOOR STRUCTURE PIVOTALLY MOUNTED IN SAID OPENING IN SAID BALLISTICALLY ENCLOSED STRUCTURE SAID DOOR STRUCTURE INCLUDING AN UPPER SECTION AND A LOWER SECTION HORIZONTALLY HINGED TO SAID BALLISTICALLY ENCLOSED STRUCTURE, A THIRD TRACK MEMBER POSITIONED BETWEEN SAID FIRST TWO MENTIONED TRACK MEMBERS, MEANS FLOATABLY MOUNTED SAID THIRD TRACK MEMBER ON SAID UPPER SECTION TO ALLOW SAID THIRD TRACK MEMBER TO COMPENSATE FOR DISCREPANCIES IN POSITION OF AT LEAST ONE OF SAID TRACK MEMBERS OF SAID LAUNCHER AND FEEDER SYSTEM, SAID PIVOTALLY MOUNTED DOOR STRUCTURE BEING MOVABLE TO SHIFT SAID THIRD TRACK MEMBER INTO TRACK ENGAGEMENT WITH SAID FIRST TWO MENTIONED TRACK MEMBERS, WHEREBY A MISSILE WEAPON CAN BE MOVED FROM SAID TRACK MEMBER OF SAID FEEDER SYSTEM TO SAID TRACK MEMBER OF SAID LAUNCHER FOR LAUNCHING THEREFROM WHEN SAID PIVOTALLY MOUNTED DOOR STRUCTURE IS OPEN.