Patent ID: 7481451

Claim:
A seat belt of a vehicle comprising: a cover made of a fabric material; upper and lower webbings respectively fixed to opposite ends of the cover; a D-ring fixed to the upper webbing and arranged within an occupant compartment of the vehicle; a retractor fixed to the lower webbing to wind and unwind the lower webbing; an air belt to rapidly supply a high-pressure gas into a bag held in the cover during a vehicle crash, and thus, to inflate the bag; a dual inflator having two gas generating components which are configured to inject different amounts of gas, respectively; and a level adjuster arranged in the occupant compartment to adjust a vertical level of the D-ring, the D-ring being mounted to the level adjuster such that the vertical level of the D-ring is adjustable in accordance with an operation of an occupant, wherein only the gas generating component configured to inject a greater amount than that of the other gas generating component injects gas when an impact level is less than a predetermined level, and wherein the level adjuster includes a fixed member fixedly mounted to a center filler, a movable member to carry the D-ring, a retractable locking member mounted in the movable member to protrude from the movable member, and a spring interposed between the movable member and the locking member to apply an elastic force to the locking member.