Patent for improvements in baling-presses by using a four-sided baling box/chamber with supporting-upright doors arranged at the top, at the front and one of the sides of the box. These doors can be hinged at diagonally-opposite corners of the box; locking-bolts are pivoted at the free end of the each door, the top door with locking-bar sliding through apertures in the uprights and the lever for operating the top door. Illustration is included.