Convergent-divergent jet nozzle

Claim 1

A COVERGENT-DIVERGENT JET NOZZEL FOR AN AIRCRAFT TYPE GAS TURBINE ENGINE HAVING AN EXHAUST DUCT WITH AN OUTLET FOR THE PASSAGE OF EXHAUST GASES THERETHROUGH, SAID NOZZEL COMPRISING ANNULAR CONVERGENT AND DIVERGENT SECTIONS AXIALLY ALIGNED WITH SAID OUTLET AND EACH OTHER AND PIVOTALLY CONNECTED TO EACH OTHER AT THEIR ADJACENT ENDS THE OPPOSITE END OF SAID CONVERGENT SECTION BEING PIVOTALLY CONNECTED TO SAID DUCT, THE PIVOTAL CONNECTION BETWEEN THE COVERGENT AND DIVERGENT SECTIONS CONSTITUING A THROAT, EACH OF SAID SECTIONS COMPRISING A PLURALITY OF CIRCUMFERENTIALLY SPACED FLAPS OPERATIVELY PIVOTALLY CONNECTED TO EACH OTHER AT THEIR ADJACENT LATERAL EDGES TO FORM A CONTINOUS ANNULAR SURFACE, THE PIVOTAL CONNECTION BETWEEN SAID FLAPS COMPRISING MEANS BOTH RADIALLY AND CIRCUMFERENTIALLY MOVABLE PERMITTING INCREASE OR DECREASE IN THE AREA ENCLOSED BY SAID FLAPS, THE MOVEMENT OF SAID PIVOTAL CONNECTION VARYING THE AREA OF SAID THROAT, CAM FOLLOWER MEANS SECURED TO EACH OF SAID FLAPS, SAID CAM FOLLOWER MEANS HAVING AN ARCUATE SLOT THEREIN, ANNULAR SHROUD MEANS HAVING A PLURALITY OF PINS THEREON ENGAGEABLE IN EACH OF SAID SLOTS, SAID SHROUD MEANS BEING AXIALLY MOVABLE TO RADIALLY VARY THE POSITION OF SAID FLAPS, AND MEANS FOR MOVING SAID SHROUD MEANS TO VARY THE AREA OF SAID THROAT, THE PASSAGE OF THE EXHAUST GASES THROUGH SAID THROAT EXERTING FORCES ON SAID THROAT TENDING TO INCREASE ITS AREA, AIR CONDUIT MEANS SECURED AT ONE END TO SAID DIVERGENT SECTION AND SURROUNDING PORTIONS OF THE SAME AND THE CONVERGENT SECTION TO DEFINE AN AIR COMPARTMENT THEREBETWEEN, THE OPPOSITE END OF SAID CONDUIT MEANS BEING IN COMMUNICATION WITH RAM AIR UPON FORWARD FLIGHT OF SAID AIRCRAFT, SAID RAM AIR ACTING IN SAID COMPARTMENT AGAINST THE EXTERIOR OF SAID SECTIONS IN A DIRECTION BALANCING THE FORCES OF SAID EXHAUST GASES PERMITTING THE AXIAL MOVEMENT OF SAID SHROUD MEANS TO SELECTIVELY VARY THE AREA SAID THROAT.