Lifting device with synchronization mechanism

A lifting device for a transfer system with a pneumatic drive for raising and/or lowering transported goods, comprising:

• a base frame;
• a lifting frame;
• means for connecting said lifting frame with said base frame and including cylinder bodies provided on one of said frames and arranged in corners of said one frame and four corner pieces provided on the other of said frames and arranged in corners of said other frame, so that said lifting frame is connected with said base frame through said cylinder bodies and said corner pieces, said base frame being composed of four substantially L-shaped profiles, while said lifting frame is composed of four substantially U-shaped profiles;
• lifting means for lifting said lifting frame relative to said base frame and including at least two lifting pistons;
• a synchronization device provided for synchronization of movements of said at least two lifting pistons and having a shaft rotatably supported on said base frame and having a first toothing system, and a second toothing system provided on said lifting frame and meshing with said first toothing system, said first and second toothing systems being arranged in the lifting device in a protected fashion.