# US 11,896,999 B2 · Cast and a shaft assembly for a disc screen > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,999 B2 - Document ID: US11896999B2 - Status: Granted - Kind: B2 - Application number: 17/616,936 - Filed: 2020-06-18 - Published: 2022-10-06 - Granted: 2024-02-13 - Earliest claimed: 2019-06-20 - Assignees: Tana Oy - Applicants: Tana Oy - Inventors: Jarkko Ruotsalainen; Kari Rautakoski - Web page: https://patentgrep.com/patent/US11896999B2 ## CPC - B07B 1/15: using corrugated, grooved or ribbed rollers - 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 The invention relates to a cast and adjacent casts on a shaft for providing a shaft assembly for a disc screen. A cast which is placeable on a shaft for a disc screen comprises a screening element part with an integral sleeve part. The shaft assembly for a disc screen comprises casts placed on the shaft, each cast comprising a screening element part and an integral sleeve part, the casts being placed against each other so that abutting screening element parts of two adjacent casts constitute a screening element, and abutting sleeve parts of two adjacent casts constitute a sleeve element on the shaft. ## Claims ### Claim 1 A cast which is placeable on a shaft for a disc screen, the cast comprising a screening element part and an integral sleeve part, wherein the screening element part constitutes a disc-like part around the shaft, and abutting screening element parts of two adjacent casts constitute a screening element, and which sleeve part is configured to define axial spacing between two adjacent screening elements, wherein only outer fringes of said screening element parts of two adjacent casts are abutted each other so that the constituted screening element is hollow and an empty space is left between the two adjacent casts when placed around the shaft. ### Claim 2 (depends on 1) The cast according to claim 1, wherein the cast is at least substantially mirror symmetric with respect to its axis of rotation and/or with respect to a surface of the cast facing another cast to be placed on the shaft. ### Claim 3 (depends on 1) The cast according to claim 1, wherein the outer surface of the sleeve part is cylindrical or conical, wherein optionally the diameter of the outer surface of the sleeve part increases 1.1 to 3.5 fold from the outer edge of the sleeve part to a foot of the sleeve, the foot being against the screening element part. ### Claim 4 (depends on 1) The cast according to claim 1, wherein the screening element part encircles the shaft as a disc-like part whose outer rim is optionally a straight circle, an angular circle, a circumference, a hexagon, an octagon; or comprises regular or irregular protrusions or branches. ### Claim 5 (depends on 1) The cast according to claim 1, comprising one or more of the following: metal, plastic and composite; or is made of a metal, a plastic, a composite, or a mixture or a combination of these. ### Claim 6 (depends on 1) The cast according to claim 1, wherein the screening element part is placeable against the screening element part of an adjacent cast on the shaft; and/or wherein the sleeve part is placeable against the sleeve part of an adjacent cast on the shaft. ### Claim 7 A cast which is placeable on a shaft for a disc screen, the cast comprising a screening element part and an integral sleeve part, wherein the screening element part constitutes a disc-like part around the shaft, and abutting screening element parts of two adjacent casts constitute a screening element, and which sleeve part is configured to define axial spacing between two adjacent screening elements, wherein only outer fringes of said screening element parts of two adjacent casts are abutted each other so that the constituted screening element is hollow, and wherein the screening element part comprises a disc-like part which extends in a substantially transverse direction from the sleeve part, as well as an outer fringe which extends in a substantially transverse direction from the disc-like part, substantially in parallel with the sleeve part, in a direction opposite to the sleeve part. ### Claim 8 (depends on 7) The cast according to the preceding claim 7 wherein the outer fringe is placeable against the outer fringe of an adjacent cast. ### Claim 9 (depends on 1) The cast according to claim 1, which is placeable against an adjacent cast on the shaft by means of counterparts. ### Claim 10 (depends on 1) The cast according to claim 1, comprising at least one counterpart for engaging with another cast, the counterpart being alternatively provided in the screening element part, at the outer fringe of the screening element part, in the disc part of the screening element part, at the edge of the disc part, and/or in the sleeve part. ### Claim 11 A cast which is placeable on a shaft for a disc screen, the cast comprising a screening element part and an integral sleeve part, wherein the screening element part constitutes a disc-like part around the shaft, and abutting screening element parts of two adjacent casts constitute a screening element, and which sleeve part is configured to define axial spacing between two adjacent screening elements, wherein only outer fringes of said screening element parts of two adjacent casts are abutted each other so that the constituted screening element is hollow, and wherein the outer surface of the sleeve part is provided with a groove extending in the longitudinal direction of the sleeve part, optionally extending to the disc part of the screening element part. ### Claim 12 A shaft assembly for a disc screen, comprising casts to be placed on a shaft, wherein each cast comprises a screening element part and a sleeve part which are integrated and are placed against each other so that abutting screening element parts of two adjacent casts constitute a screening element, and abutting sleeve parts of two adjacent casts constitute a sleeve element on the shaft, and which sleeve parts are configured to define an axial spacing between the screening element parts of the two adjacent screening elements, wherein only outer fringes of said screening element parts of two adjacent casts are abutted each other so that the constituted screening element is hollow and an empty space is left between the two adjacent casts when placed around the shaft. ### Claim 13 (depends on 12) The shaft assembly according to claim 12, comprising casts, wherein the cast is at least substantially mirror symmetric with respect to an axis of rotation and/or with respect to a surface facing another cast to be placed on the shaft.