Abstract: A sieve for screening material such as ore or coal wherein the sieve member extends horizontally and is supported at its edges by longitudinal sidewalls and at the center by a longitudinal intermediate wall and a vibratory oscillatory drive force is applied to the intermediate wall twice that of the sidewalls by rotating eccentric weights for the intermediate wall and sidewalls with the intermediate wall eccentric weight being twice that of the sidewalls eccentric weights and the rotating weights interconnected by flexible shaft drives and a main drive motor driving all of the weights in rotation.

Abstract: An improved comminuting rolling mill wherein a solid material such as mineralic loose or bulk materials are introduced into a gap between opposed parallel counter rotating comminuting rollers with the material being supplied by a delivery device above the rollers having a discharge slot extending the length of the gap between the rollers and being provided with means for accelerating the charging material to the speed of roller surface travel, with the delivery device having opposed porous walls and having means for supplying a flow of air through said walls for fluidizing the material so that fluidized material flows into the gap between rollers and the device being provided for pressurizing the delivery device so that the material is carried between the rollers at the desired speed.

Abstract: Grinding mill including at least one container partially filled with grinding media, and at least one excitation member extending in direction of the longitudinal axis of the container and disposed within the container so as to be surrounded by the grinding media received in the container; the excitation member being supported on the wall of the container by a plurality of individual rod-shaped support elements extending substantially radially from the excitation member and disposed in spaced relationship to one another in direction of the longitudinal axis.