US Patent 11618404 Seat airbag with belt and spool

An assembly includes a seat having a seatback. The assembly includes an airbag supported by the seatback and inflatable to an inflated position. The airbag extends from the seatback to an end in the inflated position. The assembly includes a spool rotatably supported by the seatback. The assembly includes a belt extending along the airbag in the inflated position. The belt extends from the spool to the end of the airbag. The belt is extendable from the spool.