What kind of mechanism does the outdoor camera car belong to? What is the basic structure?

The outdoor camera car belongs to type II parallel and torque structure. According to the related information, in the crank-rocker mechanism, when the crank is the driving part, the continuous rotation of the crank can be converted into the reciprocating swing of the rocker, such as the pitch angle adjustment mechanism of the radar antenna. In a hyperbola mechanism, if the lengths of two cranks are not equal, the driving crank rotates at a uniform speed and the driven crank rotates at a variable speed, such as an inertial screen. If the lengths of two cranks are equal and the connecting rod is equal to the frame, it is called parallel double crank mechanism. The characteristics of this mechanism are as follows.