US Patent 10245982 Vehicle seat with laterally collapsing portion

A vehicle seat includes cushion and a seatback coupled with the cushion. At least one of the seatback and the cushion includes a base body defining an internal cavity open on a side of the base portion and a secondary body slidably mounted with the base body so as to be extendible out of the internal cavity beyond the side of the base body and retractable at least partially within the cavity.