Patent ID: 8684400

Claim:
A knee airbag for protection of vehicle occupants, the knee airbag ( 100 ) being deployed between a vehicle occupant and a vehicle structure ( 2 ) and used with a gas generator ( 4 ) for filling the knee airbag ( 100 ) with inflating gas, the knee airbag ( 100 ) having a base chamber ( 10 ) which is filled first with the inflating gas, and at least one upper chamber ( 20 , 30 ) which receives the inflating gas conducted through the base chamber ( 10 ), and wherein a flow obstacle ( 12 , 23 ) for the inflating gas is arranged between the base chamber ( 10 ) and the at least one upper chamber ( 20 , 30 ), the upper chamber ( 20 , 30 ) is rolled-up or collapsed and is secured in the rolled-up or collapsed state by a securing ( 21 , 22 ) being designed in such a manner that the securing fails when a predetermined degree of filling of the base chamber ( 10 ) is reached and thereafter, the at least one upper chamber is inflated by the inflation gas, wherein the base chamber ( 10 ) unobstructed by the securing ( 21 , 22 ) in an initial deployment phase.