Patent ID: 8596675

Claim:
A dual chamber side air bag apparatus comprising: an inflator mounted to a side of a seat back frame in an outdoor direction; an air bag cushion fluid-connected to the inflator and including: a first chamber to push an upper body of a passenger in an indoor direction while developing by a pressure of gas generated from the inflator; and a second chamber mounted at a side of the seat back frame in the outdoor direction and fluid-connected to the inflator and the first chamber so as to protrude and develop toward a front of the seat back frame when the inflator is activated, for protecting side surface of the upper body of the passenger; and a tether having one end thereof fixed to the seat back frame, a mid portion thereof wrapping the first chamber, and the other end thereof sewing-coupled to the air bag cushion in a boundary of the first and second chambers to provide a directivity so that the first chamber develops toward the upper body of the passengers.