Headrests for motor vehicle seats.

Headrest (1) for motor vehicle seats, comprising a displaceable fixed part (2), a movable part (4) relative to said fixed portion (2) from a rest position to an active position, at least one means of junction (5) connecting pivotally said fixed part (2) and said movable portion (4) to determine the trajectory and the position of the movable part (4), and a drive system comprising a drive device (7 ) connected to the fixed part (2), to push and move the movable part (4) with respect to the fixed (2), wherein the drive system comprises an articulated device (8) connected pivotally at their ends to the part fixed (2) and the movable part (4), and at least one intermediate swiveling connection (9), the driving device (7) cooperating with said articulated operably device (8).