SAFETY SYSTEM FOR OBK30 / OBK40 TROLLEY, WITH POSSIBILITY OF MOUNTING ON TROLLEYS OF OTHER BRANDS. SAFE BLOCK REDUCES THE TOWER ASSEMBLY TIMES AVOIDING THE OPERATOR FROM CLIMBING WITH UNCOMFORTABLE HARNESSES TO SECURE THE TROLLEY WITH CABLES AND STEEL CLAMPS (AVOID THE OBLIGATION OF LICENSES FOR HIGH ALTITUDE). THIS OPERATION IS CARRIED OUT COMFORTABLY FROM THE GROUND THROUGH AN OPEN / CLOSE LEVER POSITIONED IN THE TOWER THAT ALLOWS THE CART TO UNLOCK TO MAKE THE DESCENT OR ASCENT. IT IS THE FIRST AND ONLY SAFETY SYSTEM ON THE MARKET THAT ALLOWS TO STOP THE TROLLEY AT ANY DESIRED HEIGHT.