DESCRIZIONE
Extensible life-preserving device comprising at least a substantially tubular structure (1) in expansible material which is empty inside and closed, capable of receiving compressed air or gas, at least one cylinder (2) containing compressed air or gas, able to completely inflate said tubular structure (1) to which is joined permanently by means of at least one automatic activation device (3) of the cylinder (2) which allows the spillage of the compressed air or gas and the inflation of the tubular structure (1), when in contact with water, said device is in a condition of inactivity in which it is wrapped around the inflation cylinder (2), wherein said tubular structure (1) and said inflation cylinder (2) are gathered together by means of one or more bands (5) allowing the storing in any limited space of the boat or of the aircraft and in a condition of activity, when it is in contact with water, wherein the tubular structure (1) inflates presenting itself in the form of elongated tubular element, wherein the structure (1) comprises a central substantially tubular body (11) on which a plurality of wings or protrusions (12) are provided which extend substantially in the direction perpendicular to said body and that roll up with it when the device is the condition of inactivity.