Angular positioning device with three dead centres

An angular positioning device, comprising:

• a first connecting rod in pivot connection with a frame of the angular positioning device, according to a first axis;
• an actuating device configured to rotate the first connecting rod a complete revolution about the first axis;
• a second connecting rod in pivot connection with the first connecting rod, according to a second axis;
• a third connecting rod in pivot connection with the frame, according to a third axis;
• a fourth connecting rod in pivot connection with the frame, according to a fourth axis, and in pivot connection with the second connecting rod, according to a fifth axis;
• a fifth connecting rod in pivot connection with the third connecting rod, according to a sixth axis, and in pivot connection with at least one of the second connecting rod and the fourth connecting rod,
• wherein the first axis is parallel to the second axis, the third axis, the fourth axis, the fifth axis, and the sixth axis,
• wherein the angular positioning device is configured such that the third connecting rod is configured to adopt three distinct angular positions,
• wherein two of the first connecting rod, the second connecting rod, the third connecting rod, the fourth connecting rod, and the fifth connecting rod that are in pivot connection with one another generate a dead center in the angular positioning device for each of the three distinct angular positions, and
• wherein an angle between the third connecting rod and the fifth connecting rod is less than 90° for at least one of the three distinct angular positions of the third connecting rod.