# US 12,766,557 B2 · Screw system for mechanical separation of matter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,766,557 B2 - Document ID: US12766557B2 - Status: Granted - Kind: B2 - Application number: 19/186,864 - Filed: 2025-04-23 - Published: 2025-10-23 - Granted: 2026-10-20 - Earliest claimed: 2024-04-23 - Assignees: Industries Machinex Inc. - Applicants: Industries Machinex Inc. - Inventors: Paul Fortier; Alexandre Lambert; Frédéric Bolduc; Alex Gobeil; Jeremy Marcoux - Web page: https://patentgrep.com/patent/US12766557B2 ## CPC - B07B 1/04: Stationary flat screens - B07B 2201/00: Details applicable to machines for screening using sieves or gratings - 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 system for mechanical separation of materials comprising at least two platforms, each comprising screws undergoing a rotational movement, wherein the screws have a proximal end and a distal end, the distal end being free, wherein the screws of a first one of the at least two platforms all have a first inclination from the proximal end thereof to the distal end thereof; wherein the screws of a second one of the at least two platforms all have a second inclination from the proximal end thereof to the distal end thereof; the first inclination being different from the second inclination. The at least two platforms form a drop in-between along the main direction of travel. There is a double-start thread screw by the drop on the downstream platform that prevents long objects to pass through the screws and optionally a curtain of elongated members by the drop. ## Claims ### Claim 1 A system for mechanical separation of materials, the system comprising: at least two platforms, each of the at least two platforms comprising screws providing a sieving surface for the materials to be sieved as the materials travel thereon, the screws each comprising a screw axis, the screw axes being parallel and neighboring one another, the screws adapted to undergo a rotational movement, wherein the at least two platforms comprise an upstream platform and a downstream platform with the upstream platform being higher than the downstream platform where their sieve surfaces neighbor one another providing a drop therebetween, the at least two platforms neighboring one another along a travel axis, and wherein at least one of the screws of a first one of the at least two platforms is a double-start thread screw and at least one of the screws of the first one of the at least two platforms is a single-start thread screw. ### Claim 2 (depends on 1) The system of claim 1, wherein at least one of the at least two platforms has an upstream end according to the travel axis, with the at least one double-start thread screw being closest to the upstream end of the first one of the at least two platforms. ### Claim 3 (depends on 2) The system of claim 2, wherein the screws comprise a plurality of double-start thread screws neighboring one another at the upstream end. ### Claim 4 (depends on 1) The system of claim 1, wherein at least one of the at least two platforms comprises a screw base with the screws comprising a supported proximal end mounted to the screw base, and a free end distal to the screw base. ### Claim 5 (depends on 4) The system of claim 4, wherein the screws have a screw inclination along the screw axis resulting in the free end of the screws being higher than a supported end of the screws. ### Claim 6 (depends on 4) The system of claim 4, wherein each one of the screws comprises a number of helicoidal blades mounted to a shaft, wherein the helicoidal blades have an identical pitch. ### Claim 7 (depends on 1) The system of claim 1, wherein at least one of the two platforms has an upstream end and a downstream end along a travel axis, and wherein the screws have a travel inclination along the travel axis, thereby generating a denivelation of the sieving surface between the upstream end and the downstream end. ### Claim 8 (depends on 1) The system of claim 1 comprising: wherein the screws of the first one of the at least two platforms have a first screw inclination relative to the horizontal, wherein the screws of a second one of the at least two platforms have a second screw inclination relative to the horizontal, the first screw inclination being different from the second screw inclination. ### Claim 9 (depends on 8) The system of claim 8, wherein the screws have a proximal end and a distal end, and wherein at least one of the first screw inclination and the second screw inclination results in the distal end of the screws being higher than the proximal end of the screws, wherein rotation of the screws exerts a movement of the materials towards the distal end of the screws. ### Claim 10 (depends on 8) The system of claim 8, wherein at least one of the first inclination and the second inclination comprises an angle of the sieving surface of over 0 degrees along a travel axis perpendicular to the screw axis, wherein the first inclination and the second inclination have different angles of the sieving surface of the platforms along the travel axis. ### Claim 11 (depends on 1) The system of claim 1, wherein one of the at least one double-start thread screw of the first one of the at least two platforms is located by the drop and at least one of the at least one single-start thread screw is located more downstream of the drop. ### Claim 12 (depends on 1) The system of claim 1, wherein the screws of one of the at least two platforms rotate in a first direction, causing material thereon to travel at least partially along the travel axis. ### Claim 13 (depends on 1) The system of claim 1, wherein the single-start thread screw and the double-start thread screw are neighboring screws extending parallel to one another, wherein the threads of each of the neighboring screws extend towards the other neighboring screw into a common sieving area in-between the neighboring screws.