Patent ID: 8011828

Claim:
A fold-out shoulder joint comprising: a main support; a fold-out arm including an upper arm and a lower arm, the upper arm operable to pivot about a pin and the lower arm operable to pivot on a spindle on one end of the upper arm; a first wheel attached to the pin; a second wheel attached to the spindle; a first carriage and a second carriage arranged on the main support; and a first coupling for coupling the first carriage and the second carriage, wherein the upper arm is fastened to the second carriage by the pin, and the first carriage is connected to the upper arm such that the fold-out arm is folded out by pivoting about the pin when the first carriage and the second carriage are moved towards each other, wherein the first coupling is operable to couple the first carriage and the second carriage when the fold-out arm has been folded out, and the first carriage and the second carriage are operable to move in common in at least one direction, and wherein the upper arm and the lower arm are mechanically linked via the first wheel and the second wheel in such a way that rotation of the upper arm about the pin causes rotation of the second wheel and the lower arm relative to the upper arm, resulting in a bending or straightening of the fold-out arm.