Steering column comprising an improved depth-blocking mechanism

Steering column comprising:

• an upper body defining a steering axis and wherein an internal tube is mounted,
• two connection flanges arranged on either side of the upper body and connecting the upper body to a support element able to be fixed to a vehicle chassis and
• a tightening and blocking device of the upper body in a position on the internal tube, the device comprising a clamp screw extending through the two connection flanges according to a tightening axis perpendicular to the steering axis, a set of cams comprising a movable cam mounted freely in translation along the clamp screw and a fixed cam, the movable cam being arranged to bear on an inner face of one of the two connection flanges as well as a rack able to cooperate with a notched arrangement provided on an inner face of the other of the two connection flanges, resilient means being arranged between the movable cam and the rack in order to exert on the rack a return force in a direction of the other of the two connection flanges bearing the notched arrangement.