Patent ID: 8544876

Claim:
An inflatable bolster for use in a passenger compartment of a vehicle, the bolster comprising: a) a hollow body comprising i. a first wall devised to face a mating surface of the vehicle, the first wall having a central area and a circumferential area surrounding the central area, ii. a second wall opposite the first wall and devised to face the passenger compartment, and iii. an air chamber formed between the first and second walls; b) an inflator for injecting a pressurized fluid into the air chamber, thereby inflating the hollow body, the inflator being in communication with the hollow body; and c) a plurality of concentric extension pleats formed in the first wall, the extension pleats extending around a major part of the circumferential area, the extension pleats contacting the second wall at a plurality of contact points which are distributed across the second wall, each contact point forming a bond between the first and second walls, the plurality of contact points being sufficient in number to at least partially suppress audible vibration of the second wall.