Screening apparatus for wood chips
US4504386A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1984 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | May 14, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07B1/4609
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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. A drive unit is provided for reciprocally moving the movable grid of each screening section, while maintaining the predetermined gap separation, and so that the chips are tossed upwardly and longitudinally toward the discharge end of the apparatus, with the chips having a thickness less than the gap separation falling therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.