The present disclosure relates to a rotation activation mechanism comprising: a release actuator; a first axle comprising a locking element fixedly attached to the first axle, the locking element configured to move between a locked position and an unlocked position; and a second axle comprising a rotation support plate fixedly coupled to the second axle, the second axle being parallel to the first axle, the rotation support plate configured to move between a folded position and an unfolded position when the the locking element is in the unlocked position; wherein when the locking element is in the locked position, the rotation support plate is fixed in the folded position or the unfolded position, and wherein a first input to the release actuator rotates the first axle which rotates the locking element from the locked position to the unlocked position; wherein a second input to the second axle rotates the rotation support plate between the folded position and the unfolded position when the locking element is in the unlocked position. The present disclosure further relates to a vehicle seat assembly including a foldable element.

A seat assembly for a vehicle includes a back rest part having a primary back rest surface being configured to support a back of an adult sitting and a sitting module. The sitting module includes a first part and a second part, wherein the first part carries a primary functional surface and a secondary back rest surface being configured to support a back of a child. The sitting module includes a pivoting mechanism and a sliding mechanism. The pivoting mechanism is kinematically interposed between the first part and the second part and the sliding mechanism is kinematically interposed between the first part and the back rest part such that the seat assembly may selectively assume a primary state in which the primary functional surface is operational or a secondary state in which the seat assembly is configured to receive a child.