Lift cages are provided which include a crosspiece which houses drive mechanisms, an access aperture and two cage doors which are operatively connected to a first motor element which moves the cage doors from an open position to a closed position. Such cage doors may include a second motor element mechanically and operatively separate from the first motor element, wherein said second motor element is connected to a blocking/releasing carriage of the cage doors. The blocking/releasing carriage may be connected to at least one chute connected to at least one of said cage doors, so as to permit the blocking/releasing of the chutes independently of the actuation of the first motor element and of the cage doors.