Abstract: A device for adjusting the position of a movable part of a vehicle seat. One of two connection elements is secured to the movable part and to the other connection element for rotation about a first axis. A lever mechanism selectively either allows the one connection element to rotate or locks it in a selected angular position. The lever mechanism includes circular toothing around an aperture in the one connection element, at least two gears engaging said toothing and movable with planetary motion about the first axis, and levers arranged to shift the gears between a first position in which they are engaged with each other and with the toothing to prevent rotation of the one connection element and a second position in which the gears are engaged only with the toothing to enable rotation of the one connection element.

Abstract: A device for adjusting the position of at least one movable part (2) of a vehicle seat (1), of the type comprising two connection elements (4, 5), at least one (4) of said two elements being secured to said movable part (2) of the seat, means (6) for connecting the two elements (4, 5) together such as to enable at least the element (4) connected to the movable part (2) to rotate about a first axis (A1), and control means (7) by which said element (4) connected to the movable part (2) of the seat is enabled to rotate or, alternatively, be locked in a preferred angular position; in which the control means (7) comprise an at least partly circular toothing (9) provided on said element (4) connected to the movable part (2) of the seat, at least two gears (10A, B) engaging with said toothing (9) and movable with planetary motion about said first axis of rotation (A1), and a lever system (17, 18) arranged to shift said gears (10A, B) into a first position (B) in which said gears engage with each other and with said