Abstract: The invention relates to a gear mechanism (40), in particular a linkage mechanism, having a base unit (42) and a rotational unit (44) which is mounted such that it can be rotated relative to the base unit about an articulation axis (46; 18), wherein the base unit has a drive element (48; 10) which can be driven rotationally, in particular, perpendicularly with respect to the articulation axis, having two rotationally mounted rotary members (54, 56; 14, 16) which can be driven in opposite directions by the drive element and are arranged, in particular, coaxially with respect to one another, wherein each of the rotary members drives a coupling element (60, 62; 30, 32) which is operatively connected to it when the drive element is rotating, wherein the two coupling elements are arranged such that they are mounted rotatably in a cage (68) of the rotational unit and are operatively connected to one another in such a way that, and wherein the drive body is operatively connected to the rotary members, the rotary mem