a device for the emptying of the residual product stored in a silo comprises a series of beams , for example , two or three beams . the first beam is mounted pivotably at a first end thereof on a pivot situated at the center of the discharge opening of the silo . toward its second end , the first beam is articulated via a pivot to a first end of the second beam . if three beams are provided , the second end of the second beam is similarly articulated via a pivot to the first end of the third beam . each beam supports a rotatable endless screw for feeding the product in the direction of the first end that beam and thus toward the discharge opening of the silo , and bears against the base of the silo via a drivable wheel which enables the beam to be pivotally displaced over the base of the silo . each beam also carries a motor assembly for driving the endless screw and the wheel associated with that beam .