Abstract: This invention relates to devices for extracting hay or the like from a cylindrical tower silo, of the kind including a pneumatic conveyor pipe leading centrally into the silo and forming an inlet at its upper end, the conveyor pipe having a suction head to which the material is fed by means of a radial conveyor. According to this invention, a portion of the conveyor pipe which follows the top end inlet into the silo extends radially with respect to the periphery of the silo and is rotatable around the axis of the silo. The free extremity of the conveyor pipe radial portion is associated with the suction head, to which the material is fed by means of the radial conveyor which conveys from the inside the silo towards the outside thereof, and also revolves around the silo axis. A vertical telescopic pipe may connect the further conveyor pipe radial portion to the top end inlet.

Abstract: A high-rise silo in which silage is fed radially by means of revolving feed members to a central vertical clearing shaft of the silo. The silage is withdrawn from the shaft at the bottom. The shaft itself is assembled from separate cylindrical pipe lengths each of which has an internal encircling groove with a sealing ring at the upper end, into which engages an internal co-axial annular flange situated at the lower end of the superjacent cylindrical pipe length, in sealing manner.