US Patent 11912230 Vehicle airbag system

An assembly includes a seat having a seat bottom that includes a top surface. The assembly includes an airbag supported by the seat and inflatable to an inflated position. The airbag in the inflated position includes a bottom end positioned below the top surface. The assembly includes a pyrotechnic retractor supported by the seat bottom. The assembly includes a tether connected to the bottom end of the airbag and to the pyrotechnic retractor such that actuation of the pyrotechnic retractor retracts the tether and urges the bottom end of the airbag toward the seat bottom.