Crank lifting system for fast height adjustment of sitstand workplaces. Mechanical synchronization of two spindle lift drives with crank, brake unit, deflection gear and drive shafts. The system is suitable for 2-leg table frames with high efficiency of the guide units. Convenient adjustment of up to 40 kg table loads is ensured. The lift of 500 mm meets the requirements of the new standard for sitting-standing workplaces.