A conversion device for converting linear movement in a stationary system into rotary movement about a pivot axis in a system which rotates about an axis of rotation that is not identical or parallel to the pivot axis. The conversion device has a lift element and a lift device with which the lift element can be moved with translatory movement relative to the stationary system. The lift element has first and second lift element portions connected together by a rotary bearing so that the first lift element portion can be rotated relative to the second lift element portion about the axis of the rotary bearing. The first lift element portion is connected to the lift device and the second lift element portion is connected to the conversion device. The conversion device is connected to a shaft positioned on the pivot axis so that a linear movement of the second lift element portion is converted into a rotary movement of the shaft about the pivot axis.