# US 2014/0197259 A1 · Stationary disc, rotating disc and mill assembly for reducing machines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197259 A1 - Document ID: US20140197259A1 - Status: Published application - Kind: A1 - Application number: 13/742,773 - Filed: 2013-01-16 - Published: 2014-07-17 - Earliest claimed: 2013-01-16 - Assignees: Orenda Automation Technologies Inc. - Inventors: Hristos Lefas; Friedhelm Roderich FEDER - Web page: https://patentgrep.com/patent/US20140197259A1 ## CPC - B02C 7/17: Cooling or heating of discs - B02C 7/02: with coaxial discs - B02C 7/08: with vertical axis (B02C7/04 takes precedence) - B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02}) ## Abstract A reducing machine having an air cooled cutting discs is disclosed. The air cooled discs have cutting surfaces on both sides. The cutting surfaces have edges which are sharpened for cutting input material when the cutting surface is facing the cutting surface of the opposed disc. When the cutting surface of the stationary disc is facing the housing, the cutting surface acts as a heat sink to air cool the stationary disc and the mill assembly in general. Air inlets in the housing lid permit air to flow over the cooling surface. A damper restricts air flow over the air cooling surface to control the temperature of the reducing machine, such as during start up. ## Claims ### Claim 1 A disc mill assembly of a reducing apparatus having a fan, said disc mill assembly comprising: a rotating disc having a rotating cutting surface; a stationary disc having a stationary cutting surface on a first side for operative interaction with the rotating cutting surface of the opposed rotating disc, and, a second side having an air cooling surface in thermal contact with the stationary cutting surface; a housing lid having air inlets on an external wall; an attaching mechanism for operatively attaching the stationary disc to the housing lid with the air cooling surface facing the air inlets and axially separated therefrom to permit air flow between said housing and the cooling surface; wherein, during operation, the fan draws air from the air inlets, between the housing and the air cooling surface to cool the stationary disc. ### Claim 2 (depends on 1) The disc mill assembly as defined in claim 1 wherein, during operation, reduced material from the stationary disc and rotating disc becomes entrained in air flow from the air inlets. ### Claim 3 (depends on 1) The disc mill assembly as defined in claim 1 wherein the attaching mechanism comprises a radial flange located intermediate the air cooling surface and cutting surface, said radial flange operatively attaching to at least one attaching rib extending axially from an inside surface of the external wall of the housing lid to axially separate the second side of the disc from the inside surface of the housing lid and form an air channel from the air inlets across the cooling surface and over the radial flange. ### Claim 4 (depends on 3) The disc mill assembly as defined in claim 3 wherein the housing comprises support ribs extending axially inwardly from the inside surface of the housing lid and engaging the radial flange of the stationary disc when said disc is attached to the at least one attaching rib, said support ribs supporting the stationary disc and directing air flow from the air inlet through gaps formed between the radial flange and the supporting ribs. ### Claim 5 (depends on 1) The disc mill assembly as recited in claim 1 wherein the air cooling surface comprises a plurality of substantially radially extending cooling ridges having cutting edges and the stationary cutting surface comprising a plurality of substantially radially extending cutting ridges having cutting edges; wherein the attaching mechanism operatively attaches the stationary disc to the housing in a first orientation, with the air cooling surface facing the air inlets and axially separated therefrom to permit air to flow between said housing lid and said cooling surface, and, with said plurality of substantially radially extending cutting ridges of the stationary cutting surface arranged in facing operative interaction with the rotating cutting surface of the opposed rotating disc to reduce the input material, and wherein the attaching mechanism operatively attaches the stationary disc to the housing lid in a second orientation, with said plurality of substantially radially extending cutting ridges of the stationary cutting surface facing the air inlets and axially separated there from to permit air to flow between said housing lid and said cutting surface, and, with said plurality of cooling ridges of the air cooling surface having cutting edges arranged in facing operative interaction with the rotating cutting surface of the opposed rotating disc to reduce the input material, and wherein, in the second orientation, during operation, air is drawn through the air inlets of the housing and across the plurality of cutting ridges of the cutting surface to cool the stationary disc. ### Claim 6 (depends on 1) The disc mill assembly as defined in claim 1 wherein, the rotating disc is substantially symmetrical about a central radial plane and said rotating disc comprises a second rotating cutting surface substantially opposite to the rotating cutting surface about the central radial plane; and wherein the rotating disc is fixed to a rotating shaft in a first orientation with respect to the stationary disc with the rotating cutting surface facing the stationary disc to reduce input material, and after the rotating cutting surface is no longer functional for reducing input material, the rotating disc is fixed to the rotating shaft in a second orientation with respect to the stationary disc with the second rotating cutting surface facing the stationary disc to reduce input material. ### Claim 7 (depends on 6) The disc mill assembly as defined in claim 6 wherein the central radial plane substantially coincides with a plane of rotation of the rotating disc. ### Claim 8 (depends on 1) The disc mill assembly as defined in claim 1 further comprising: an air control device for controlling air flow through the air inlets; and wherein the air control device restricts air flow through the air inlets to retain heat generated by the disc mill assembly within the reducing machine. ### Claim 9 (depends on 8) The disc assembly as defined in claim 8 wherein the air control device comprises an air damper having an open position permitting air flow therethrough and a closed position restricting air flow therethrough; and an air baffle for directing air flow from the air damper to the air inlets. ### Claim 10 (depends on 8) The disc assembly as defined in claim 8 wherein during initial start up of the reducing machine, the air control device restricts air flow through the air inlets to facilitate initial heating of the reducing machine. ### Claim 11 (depends on 10) The disc assembly as defined in claim 10 wherein once the initial heating of the reducing machine is completed, the air control device permits air flow through the air inlets to cool the stationary disc. ### Claim 12 A stationary disc for use in a disc mill assembly of a reducing machine, said stationary disc comprising: a first side having a stationary cutting surface for operative interaction with a rotating cutting surface of an opposed rotating disc; a second side having an air cooling surface in thermal contact with the stationary cutting surface; an attaching mechanism for operatively attaching the stationary disc to a housing, said housing having air inlets through an external wall, with the air cooling surface facing the air inlets and axially separated therefrom to permit air to flow between said housing and said cooling surface, and, with said stationary cutting surface arranged in facing operative interaction with the rotating cutting surface of the opposed rotating disc to reduce the input material; wherein, during operation, air is drawn in through the air inlets of the housing and across the air cooling surface to cool the stationary disc. ### Claim 13 (depends on 12) The stationary disc as recited in claim 12 wherein the attaching mechanism comprises a radial flange located intermediate the air cooling surface and cutting surface, said radial flange operatively attaching to at least one attaching rib extending from an inner surface of the housing to axially separate the second side of the disc from the inside surface of the external wall of the housing and form an air channel from the inlet holes across the cooling surface and over the radial flange. ### Claim 14 (depends on 13) The stationary disc as recited in claim 13 wherein the radial flange engages support ribs extending axially from the inside surface of the external wall of the housing to support the disc and direct air flow from the air inlet, across the air cooling surface and through gaps formed between the radial flange and the supporting ribs. ### Claim 15 (depends on 12) The stationary disc as recited in claim 12 wherein the cutting surface comprises a plurality of substantially radially extending cutting edges; and wherein the air cooling surface comprises a plurality of substantially radially extending cooling ridges. ### Claim 16 (depends on 15) The stationary disc as recited in claim 15 wherein the plurality of substantially radially extending ridges of the cooling surface have cutting edges, and, the substantially radially extending cutting edges of the cutting surface are oriented on a plurality of substantially radially extending cutting ridges; wherein the attaching mechanism operatively attaches the stationary disc to the housing in a first orientation, with the air cooling surface facing the air inlets of the exterior wall and axially separated therefrom to permit air to flow between said housing and said cooling surface, and, with said stationary cutting surface arranged in facing operative interaction with the rotating cutting surface of the opposed rotating disc to reduce the input material, and wherein the attaching mechanism operatively attaches the stationary disc to the housing in a second orientation, with the cutting surface facing the air inlets and axially separated therefrom to permit air to flow between said housing and said cutting surface, and, with said plurality of radially extending cooling ridges of the air cooling surface having cutting edges arranged in facing operative interaction with the rotating cutting surface of the opposed rotating disc to reduce the input material, and wherein, in the second orientation, during operation, air is drawn through the air inlets of the housing and across the plurality of radially extending cutting ridges of the cutting surface to cool the stationary disc. ### Claim 17 (depends on 16) The stationary disc as recited in claim 16, wherein the stationary disc is substantially symmetrical about a radial plane. ### Claim 18 A rotary disc for use in a disc mill assembly of a reducing machine, said rotating disc comprising: a first rotating cutting surface for operative interaction with cutting surfaces of an opposed stationary disc; a second rotating cutting surface for operative interaction with cutting surfaces of the opposed stationary disc; wherein the rotating disc is substantially symmetrical about a central radial plane with said second rotating cutting surface substantially opposite to the first rotating cutting surface about the central radial plane; wherein the rotating disc is fixed to a rotating shaft in a first orientation with respect to the stationary disc with the first rotating cutting surface facing the stationary disc to reduce input material, and after the rotating cutting surface is no longer functional for reducing input material, the rotating disc is fixed to the rotating shaft in a second orientation with respect to the stationary disc with the second rotating cutting surface facing the stationary disc to reduce input material. ### Claim 19 (depends on 18) The rotating disc as defined in claim 18 wherein the central radial plane substantially coincides with a plane of rotation of the rotating disc. ### Claim 20 (depends on 18) The rotating disc as defined in claim 18 wherein the first and second cutting surfaces have radial ridges with sharpened edges.