Patent ID: 7798572

Claim:
A manual adjustment device of a back support on a vehicle seat, the manual adjustment device comprising: a cable pulley selectively rotatable in one of a drive direction and a driven direction oriented counter to the drive direction; a tensile device associated with the cable pulley, wherein the tensile device is configured to be rolled up onto the cable pulley by rotating the cable pulley in the drive direction; a lock configured to restrict the rotation of the cable pulley in the driven direction when in a locked position; wherein in the locked position, the cable pulley is in frictional contact with at least one braking surface of the lock to restrict the rotation of the cable pulley in the driven direction; wherein the tensile device is configured to be coupled to the back support of the vehicle seat such that the rotation of the cable pulley in at least one of the drive direction and the driven direction affects an adjustment of the back support; wherein a pretensioning acts on the cable pulley to produce a torque of the cable pulley in the driven direction; and wherein in the locked position, the pretensioning presses the cable pulley against the at least one braking surface.