Patent ID: 8276526

Claim:
An adjusting device comprising: an outer tubular body; an inner tubular body positioned concentrically relative to the outer tubular body; and an actuator configured to telescopically adjust in a longitudinal direction the inner and outer tubular bodies with respect to one another, the actuator including: a supporting tube positioned concentrically inside the inner tubular body and configured to move simultaneously with the inner tubular body relative to the outer tubular body, the supporting tube having at a first end thereof a first stop which abuts the inside surface of the inner tubular body and at a second end thereof a second stop which abuts the inside surface of the outer tubular body, the first and second stops configured to restrict lateral movement of the inner and outer tubular bodies with respect to the longitudinal axis of the inner and outer tubular bodies; a spindle provided with a plurality of grooves extending along the longitudinal thereof; and rollers mounted with their axes of rotation substantially perpendicular to the spindle, wherein the rollers are configured to rotate with their peripheral surfaces along the grooves.