Patent ID: 8282122
Filing Date: 2012-10-09
Classification: B60R

Abstract:
1. An airbag comprising: a main chamber having at least one main vent to vent gas from the main chamber to atmosphere; at least one subsidiary chamber of considerably smaller volume than the main chamber connected to the main chamber by at least one transfer vent formed in a common wall between the respective subsidiary chamber and the main chamber wherein: each subsidiary chamber has at least one subsidiary vent to atmosphere, the airbag has a main wall fastened on each longitudinal edge to a respective side wall and at least one shaping tether connected to the main wall to form a depression in the main wall when the airbag is deployed corresponding to the location of each subsidiary chamber and a cover member is attached to the main wall and the two side walls to cover each depression to form the respective subsidiary chamber, and wherein at least one of the vents is a self-regulating vent arranged to automatically reduce the flow of gas from one of the chambers during deflation of the airbag, the self-regulating vent controlled by tension in a vent tether attached to the vent and arranged to automatically increase the restriction to flow when the tension in the vent tether reduces during deflation of the airbag.