Abstract: An apparatus is disclosed for screening and separating wood chips or the like according to thickness. In the illustrated embodiment, the apparatus comprises two generally horizontal decks mounted one beneath the other, and with each deck having three screening sections disposed in a serial arrangement along its longitudinal length. Each screening section comprises an opening in the associated deck, a stationary grid composed of parallel rod elements disposed in the opening, and a movable grid which is also composed of a plurality of rod elements and which are disposed in alternating relation with the rod elements of the stationary grid. Further, the grids are arranged so that the gaps between the rod elements are parallel and of predetermined uniform separation throughout.

Abstract: Apparatus is provided for depositing solid particulate material in a frustoconical pile within a space of predetermined dimensions comprising, in combination:(a) a screw conveyor for particulate material arranged substantially horizontally;(b) means for feeding particulate material to the screw conveyor;(c) the screw conveyor having a screw mounted at one end for driven rotation and operatively disposed in the screw conveyor for receiving and transporting particulate material therealong;(d) means for depositing particulate material conveyed by the screw conveyor as a pile below the conveyor up to a maximum height corresponding to the level of the screw;(e) the screw being arranged when maximum pile height is reached to carry particulate material at its level along the top of the pile to an outer edge thereof for deposit there, thereby leveling off the top of the pile and maintaining a frustoconical shape in the pile, while ensuring spreading of the pile of particulate material throughout and within a space of