Motorized pantographs to open case by lifting
There are a number of ways of lifting a glass box case, such as electric actuators or screws, but the drawback of these systems is that the distance they can raise the box depends on the height of the base that houses the lifting mechanism.
The standard solution
Pantographs with multiple arms can be used to increase the height achieved, even with low bases.
Goppion has developed special pantographs whose first two connecting rods are arched in order to obtain two results: first, they greatly reduce the space needed to house the motors and transmission equipment; second, the arms' hooked shape avoids reaching a stalling position at the beginning of the lifting maneuver, which is caused by the angle between the arms themselves that prevents them rotating on their own axis in spite of the action of the motor.