Vehicle seat, in particular for commercial vehicles, comprising a seat part and a backrest and shared functions

The vehicle seat (1) has a seat part (2), a backrest (3) and a lower part (6), relative to which an upper part (5) is spring-mounted, where the upper part supports the seat part and the backrest. A rotating unit (12) and a horizontal spring unit (13) are simultaneously locked and unlocked by a common switching element (16) with respect to movements (8). The vehicle seat is aligned in a locked condition to the rotating unit in driving direction.