The gas spring is designed in such a way that the roof opens automatically. Depending on the prevailing temperature, different actuating forces are required to close it again (see coloured graphs).
The mechanism used here is a scissor kinematics, which is a special case but can also be seen as a representative of the larger class of six-bar mechanisms.
At the end position of the pop-up roof, the gas spring is fully extended. This and similar kinematics can also be found in access hatches and other roof pan types.