This diploma thesis is focused on container safety mechanism which is a part of truck trailers. It designs pneumatic – mechanical safety mechanism suitable for safe transport of container with driving drum which are produced according to German standard DIN 30 722. It concerns containers with total weight of 22 tons. The first part of this thesis is focused on evaluation of possible load by common operating conditions. The technique of mechanism design is introdiced in several developing stages from original solution to final version. The final version processes all force and kinetic aspects. Selected parts of safety mechanism are controlled from solidity perspective. Some calculations and analysis were processed both by convention method a...