| 摘要 |
PURPOSE: A buoyancy body of a life jacket is provided to secure buoyancy and to improve air permeability in wearing the life jacket by ventilating an exposed seat body through a vent hole and by discharging the air in a buoyancy material through the vent hole. CONSTITUTION: A buoyancy material(7) is partially mounted on the surface of an air-permeable seat body(1) with the predetermined thickness to expose a portion of the surface of the seat body. The seat body has vent holes on inner and outer sides. The air flows through an inner part of the seat body in the direction of crossing the thickness direction. The seat body has a cushion effect in the thickness direction. Two double-knitted fabrics are separated at the predetermined gap and connected by link strings. |
