Adjusting mechanism for a support structure

The present invention discloses an adjusting mechanism for a support structure of a seat of a vehicle comprising a first rotatable adjusting means 10 and at least one engaging means 30 displaceable by means of the rotation of the first adjusting means 10 from a neutral position to a connecting position in such a way that it engages in a second rotatable adjusting means 50 in said connecting position, wherein by the rotation of the first adjusting means 10 first the engaging means 30 is engageable into the second adjusting means 50 by a linear motion and then the second adjusting means 50 is adjustable by this rotation.