Patent ID: 6951493

Claim:
An automatically inflatable safety device, comprising an inflatable safety jacket having an inner face formed with an air valve, and an inflation mechanism mounted on the air valve of the safety jacket, wherein: the inflation mechanism includes: a hollow main body having an inside formed with a stepped receiving chamber and having a periphery formed with a hollow inflation seat communicating with the receiving chamber of the main body, an inflation nozzle protruded from and connected to an inside of the inflation seat and having a distal end inserted into the air valve of the safety jacket and a passage communicating with the receiving chamber of the main body; an air tank mounted on the inflation seat; a firing pin movably mounted in the inflation seat and having a first end movable into the air tank and formed with a plurality of slits; a drive shaft movably mounted in the receiving chamber of the main body to drive the firing pin to move toward the air tank and having a first end formed with two opposite locking portions; a retaining ring rotatably mounted in the receiving chamber of the main body and having an inner wall formed with two opposite stop portions each detachably locked on a respective one of the two locking portions of the drive shaft; and a pull wire wound around a periphery of the retaining ring to rotate the retaining ring and having a first end secured on the retaining ring and a second end protruding outward from the passage of the main body.