The lifting systems controls the lifting process and also the opening and closing of the bottom door. The columns equipped for 1 hook lifting system are easy to control.The bottom door will opens touching the opening device to the side of the collection truck. The waste will fall by gravity. To close the bottom door it is only needed to put the container on the bottom door.
The lifting system by double hook implies the column to have 2 rings. The collecting truck uses one to lift the container and the other to control the opening and closing of the bottom doors.
The Kinshofer lifting system lift the column and the container through the flange and controls the opening and closing the bottom doors through the chains which connect to the flange/ mushroom to the bottom doors.