Inflatable dinghies

Claim 1

A SELF-UNFOLDING INFLATABLE FLOTABLE RESCUE DEVICE ADAPTED TO BE STORED IN FOLDED CONDITION COMPRISING FLOTABLE STRUCTURE INCLUDING A BUOYANCY TUBE OF RELATIVELY LARGE CROSS-SECTION, EXPANDABLE STRUCTURE SECURED TO SAID BUOYANCY TUBE AND INCLUDING AN UNFOLDING TUBE OF MUCH SMALLER CROSS-SECTION AND CAPABLE OF WITHSTANDING A MUCH HIGHER GASEOUS PRESSURE THAN SAID BUOYANCY TUBE FOR UNFOLDING SAID BUOYANCY TUBE, A FIRST SOURCE OF GASEOUS MEDIUM UNDER PRESSURE HAVING A VALVED OUTLET, A CONDUIT CONNECTING SAID OUTLET TO THE INTERIOR OF SAID UNFOLDING TUBE FOR CONDUCTING GASEOUS MEDIUM UNDER PRESSURE FROM SAID FIRST SOURCE TO SAID UNFOLDING TUBE TO EFFECT UNFOLDING OF THE RESCUE DEVICE UPON OPENING OF SAID VALVED OUTLET AND TO ESTABLISH A PREDETERMINED PRESSURE IN SAID UNFOLDING TUBE, MEANS FOR EFFECTING OPENING OF SAID VALVED OUTLET, A SECOND SOURCE OF GASEOUS MEDIUM UNDER PRESSURE HAVING A VALVED OUTLET, A CONDUIT CONNECTING SAID LAST MENTIONED OUTLET TO THE INTERIOR OF SAID BUOYANCY TUBE TO EFFECT INFLATION OF SAID BUOYANCY TUBE UPON OPENING OF SAID LAST MENTIONED OUTLET, A CONTROL HEAD FOR EFFECTING OPENING OF SAID LAST MENTIONED VALVED OUTLET IN RESPONSE TO A PREDETERMINED GASEOUS PRESSURE, AND A CONDUIT ESTABLISHING FLUID FLOW COMMUNICATION BETWEEN THE INTERIOR OF SAID UNFOLDING TUBE AND SAID CONTROL HEAD FOR EFFECTING OPERATION OF SAID CONTROL HEAD IN RESPONSE OF ATTAINMENT OF THE PREDETERMINED PRESSURE WITHIN SAID UNFOLDING TUBE.