Automatic cover for loading box of freight car

The present invention relates to an automatic cover for a loading box of a cargo truck. The automatic cover, which is installed on a loading box of a cargo truck to prevent goods loaded in the loading box from falling or scattering, includes: a fixing frame installed in a gridded shape in an upper part of the loading box of the cargo truck; a plurality of cover supporters placed at regular intervals while going across the fixing frame; a multistage cover having each cover fixed to an upper side of the cover supporters, thereby overlapping and gathering each cover together with the cover supporters or being withdrawn and unfolded from each cover; guide plates fixed to both sides of the inside of the multistage cover, respectively, in a longitudinal direction of the fixing frame under the both sides, wherein a plurality of sprocket insertion holes lined up with roller guide grooves are formed above and below an outer side of each; roller bearings connected to the cover supporters, respectively, under both sides of the inside of each cover of the multistage cover while being inserted into the roller guide grooves of the guide plate; a driving part supporter fixed along the front side of the rearmost cover of the multistage cover; a driving part installed in an upper part of the driving part supporter; rotation delivery parts connected to the driving part supporter to be connected to lower parts of both sides of the rearmost cover, respectively, while being connected to both sides of the driving part to switch directions of rotation movement; and sprockets connected to bottoms of both sides of the rotation delivery parts, respectively, to have sprocket blades inserted into the sprocket insertion holes of the guide plates on both sides, respectively. Therefore, the present invention has an effect of certainly and simply performing an operation of overlapping and gathering each cover of the multistage cover or spreading and unfolding the same by just moving the rearmost cover through the rotation delivery part and the driving part. 본 발명은 화물차량의 적재함 자동덮개에 관한 것으로서, 화물차량의 적재함에 설치되어 상기 적재함에 적재된 운송물의 낙하나 비산을 방지하도록 한 자동덮개에 있어서, 상기 화물차량의 적재함 상부에 격자형으로 설치되는 고정 프레임; 상기 고정 프레임의 사이를 가로질러 일정한 간격을 두고 배치되는 다수개의 덮개 지지대; 상기 덮개 지지대의 위쪽에 각각의 덮개가 고정되어, 덮개 지지대와 함께 상기 각 덮개가 겹쳐 모아지거나 각각의 덮개로부터 인출되어 전개되는 다단식 덮개; 상기 다단식 덮개 내부의 양쪽 아래에서 고정 프레임의 길이방향을 따라 양쪽에 각각 고정 설치하되, 각각의 바깥쪽 면의 상하로 롤러 가이드홈과 일렬로 형성되는 다수개의 스프로켓 삽입공이 각각 형성된 가이드판; 상기 다단식 덮개의 각 덮개 내부의 양쪽 아래에서 덮개 지지대에 각각 연결되면서 상기 가이드판의 롤러 가이드