Patent ID: 8801484

Claim:
A life preserver that is worn on a body, comprising: a preserver body including therein a hollow region in a sealed state; a resilient component, provided in the hollow region, that deforms when pressure is added and returns to an original shape when pressure is withdrawn; and a foaming portion that includes a foaming agent disposed within the hollow region, wherein a water inlet enabling water or sea water to flow into the hollow region is disposed in the preserver body, and with the resilient component in a deformed state resulting from the addition of pressure, air removed from the hollow region, the water inlet held in a sealed state, and the preserver body in water, when the water inlet is opened in the water and water or sea water flows into the hollow region, with F1 representing water pressure added to the preserver body, a resilient force F2 operates on the resilient component to be greater than F1 and the resilient component changes shape in a manner to return to the original shape, and in accordance with the resilient component changing shape, water or sea water flows from the opened water inlet into the hollow region to generate a gas resulting from a chemical reaction between the foaming agent and the water or sea water to increase the total volume within the preserver body, thereby increasing buoyancy of the overall preserver body and causing the body wearing the preserver body to float.