Helicopter escape means

Claim 1

A SEAT CONSTRUCTION FOR HELICOPTERS COMPRISING A SEAT STRUCTURE HAVING AN UPWARDLY FACING SEAT MEMBER FOR NORMALLY SUPPORTING A SUBSTANTIAL PORTION OF THE WEIGHT OF A HELICOPTER OCCUPANT AND A FORWARDLY FACING BACK MEMBER EXTENDING ABOVE SAID SEAT MEMBER AT A PREDETERMINED ANGULAR RELATIONSHIP; HORIZONTALLY DISPOSED TRACK MEANS AFFIXED TO THE REARWARD SURFACE OF SAID BACK MEMBER FOR GUIDING LATERAL MOVEMENT OF SAID SEAT STRUCTURE ALONG MATING HORIZONTALLY DISPOSED SUPPORTING TRACK MEANS; CATAPULT MEANS EXTENDING SUBSTANTIALLY HORIZONTALLY ALONG SAID BACK MEMBER REARWARD SURFACE FOR LATERALLY EJECTING SAID SEAT STRUCTURE AND ITS OCCUPANT IN THEIR UPRIGHT POSITIONS A PREDETERMINED DISTANCE BEYOND AN OPENED ADJACENT DOOR FRAME OF SAID HELICOPTER; AND ROCKET MEANS CARRIED BY SAID HEAT STRUCTURE FOR SUBSEQUENT ROCKETING OF SAID LATERALLY EJECTED SEAT STRUCTURE AND OCCUPANT TO AN ALTITUDE POSITION ALLOWING SAFE PARACHUTE DEPLOYMENT; SO CONSTRUCTED AND ARRANGED THAT SAID SEAT STRUCTURE AND OCCUPANT MAY BE MOVED TO SAID ALTITUDE POSITION AFTER AVOIDING SUCH DANGERS AS MOVING ROTOR BLADES.