CARGO TRANSPORTATION BOX BODY WITH CARGO HANDLING DEVICE

Provided is a cargo transportation box body with a cargo-handling device for cargo unloading or loading, the box body having on its bottom a floor board movable via a cylinder in an antero-posterior direction, and a movable partition wall on the floor board such that, when the movable partition wall is latched, only the floor board is movable, and when allowed to move, the movable partition wall moves in association with the floor board, wherein whether the movable partition wall should be moved synchronously with the floor board or with a divergence relative to the latter is securely selectable, and the movable partition wall maintains a stabilized condition, being safely prevented against lateral swinging fluctuations. A sprocket (3) with projections on its periphery is attached around an axis at the base of the movable partition wall (12) to be rotatable round the axis driven by a reversible motor (47), a first chain (2a) comprising a series of rings has one end fixed to the left (or right) posterior end of the box body (10) and the other end to the right (or left) anterior end of the same body while a second chain (2b) comprising a series of rings has one end fixed to the right (or left) posterior end of the box body (10) and the other side to the left (or right) anterior end of the same body, and the first and second chains (2a), (2b) cross with each other at their mid-portions where resides the sprocket (3) such that the holes of the rings constituting the first and second chains (2a), (2b) engage with the projections of the sprocket (3)