DOOR STEP MOUNTING STRUCTURE OF A LARGE TRUCK FOR ENABLING A PASSENGER TO EASILY GET ON/OFF A CAB OF THE LARGE TRUCK

摘要

PURPOSE: A door step mounting structure of a large truck is provided to improve the structure of a door step of the large truck into a folding structure of a stair type. CONSTITUTION: A door step mounting structure of a large truck comprises an upper step(11) formed to the inner lower side of a door to enable a passenger to step on the upper step in getting on/off a cab of the large truck; an intermediate step(12) unfolding under the upper step when the door is opened; a lower step(13) unfolding under the intermediate step when the door is opened; and a step-expanding/folding unit installed to a side of the intermediate and lower steps. When the intermediate step is unfolded, the intermediate step is protruded to the outside more than the upper step. The intermediate step is folded if the door is closed. When the lower step is unfolded, the lower step is protruded to the outside more than the intermediate step. The lower step is folded if the door is closed. The step-expanding/folding unit expands and folds the intermediate and lower steps according to the opening and closing of the door.