Sliding cover for a truck

An overhead door assembly for a truck, includes an overhead door, composed of a multiplicity of pivotably connected flat panels, which is coupled to a rotatable winding drum, to permit coiling and uncoiling thereon and, in turn, closing and opening of the door. The assembly also includes at least one cable, one end of which is coupled to the door and the other end of which is secured to a rotatable cable winding drum, to permit coiling and uncoiling of the cable thereon. A device is provided for positively rotating the door winding drum to effect coiling of the door thereon and, in turn, movement of the door to the open position, and a device is also provided for positively rotating the cable winding drum to effect coiling of the cable thereon and, in turn, movement of the door to the closed position.