This thesis deals with the task of constructing a portable gantry crane and its gripping mechanism, i.e. a vertical lifting clamp that enables the transfer of steel plates. In the introduction, the existing types of cranes and their working principles are briefly explained. Portable gantry crane, their operating principle and individual constructional solutions of the load-bearing structure of the crane and associated subassemblies are discussed. After reviewing the market, several concepts are developed, and the most appropriate solution was selected based on the given conditions. Then follows the calculation and construction of the vertical lifting clamp according to the given parameters. After that, it is checked whether the loadbearing structure meets the conditions regarding calculation of strength, rigidity, stability and critical joints. At the end of the work, the lifting mechanism, winch and other standard components are selected according to the requirements of the task. The model and technical documentation were created using the SolidWorks software package.