# US 5,341,939 A · Multiple deck vibrating screen apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,341,939 A - Document ID: US5341939A - Status: Granted - Kind: A - Application number: 08/020,359 - Filed: 1993-02-22 - Granted: 1994-08-30 - Earliest claimed: 1993-02-22 - Assignees: Corrosion Engineering, Inc. - Inventors: David J. Aitchison; Donald C. Dunn - Web page: https://patentgrep.com/patent/US5341939A ## CPC - B07B 1/42: Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens - B07B 1/46: Constructional details of screens in general; Cleaning or heating of screens - B07B 2201/04: Multiple deck screening devices comprising one or more superimposed screens - B07B: SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL (wet separating processes, sorting by processes using fluent material in the same way as liquid B03; combinations of dry separating apparatus with wet separating apparatus B03B; using liquids B03B, B03D; sorting by magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high voltage electric fields B03C; centrifuges or vortex apparatus for carrying out physical processes B04; hand sorting, postal sorting, sorting by switching or other devices actuated in response to detection or measurement of some feature of articles or samples of material B07C) ## Abstract A vibrating screen apparatus for effecting screening of materials includes a frame with first and second vibrating screen deck units mounted one above the other in it. To provide maximum flexibility of operation, the vibrating deck units are pivoted at the material feed end on the frame. Hydraulic cylinders are attached between the free ends of the first and second vibrating screen deck units and the frame for independently varying the angle or slope of each of the deck units, relative to the frame, for adjusting the dwell time of material passing over the deck units. A flexible corrugated rubber curtain extends between the upper deck unit and the lower deck unit to ensure that material which passes through the upper deck unit is guided onto the surface of the lower deck unit. In addition, each of the vibrating screen deck units has an independent vibrator mechanism on it; so that the vibration rate and magnitude may be independently adjusted for each of the deck units in the system. ## Claims ### Claim 1 A vibrating screen apparatus for material screening including in combination: a frame; at least first and second elongated vibrating screen decks having first and second sides and first and second ends; first and second pivot means for pivotally mounting the first ends of said first and second vibrating screen decks, respectively, on said frame, with said first vibrating screen deck located above said second vibrating screen deck; first and second means coupled with first and second said vibrating screen decks, respectively, for rotating said first and second vibrating screen decks about said first and second pivot means for varying the angle of said first and second vibrating screen decks relative to said frame; means for vibrating said first and second vibrating screen decks; and flexible curtain members extending between the first sides and the second sides, respectively, of said first and second vibrating screen decks to ensure that material falling through said first vibrating screen deck drops onto said second vibrating screen deck. ### Claim 2 (depends on 1) The combination according to claim 1 wherein said first and second means coupled to said first and second vibrating screen decks for rotating said decks about said first and second pivot means independently rotates said first and second decks about said first and second pivot means. ### Claim 3 (depends on 2) The combination according to claim 2 wherein said first and second means for rotating said first and second vibrating screen decks are coupled between said frame and the second ends of said first and second vibrating screen decks, respectively. ### Claim 4 (depends on 3) The combination according to claim 3 wherein said pivot means are located on said frame at a material feed end of said vibrating screen decks. ### Claim 5 (depends on 4) The combination according to claim 4 wherein said first and second means for rotating said first and second vibrating screen decks comprise first and second hydraulic members, respectively. ### Claim 6 (depends on 5) The combination according to claim 5 wherein said means for vibrating said vibrating screen decks comprises first and second vibrators coupled with said first and second vibrating screen decks, respectively, for independently vibrating said first and second vibrating screen decks. ### Claim 7 (depends on 1) The combination according to claim 1 wherein said means for vibrating said vibrating screen decks comprises first and second vibrators coupled with said first and second vibrating screen decks, respectively, for independently vibrating said first and second vibrating screen decks. ### Claim 8 (depends on 1) The combination according to claim 1 wherein said first and second means for rotating said first and second vibrating screen decks are coupled between said frame and the second ends of said first and second vibrating screen decks, respectively. ### Claim 9 (depends on 8) The combination according to claim 8 wherein said first and second means for rotating said first and second vibrating screen decks comprise first and second hydraulic members, respectively. ### Claim 10 (depends on 1) The combination according to claim 1 wherein said flexible curtain members comprise corrugated rubber-like sheets.