# US 2019/0168361 A1 · Grinding Disc Device for a Grinding Apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168361 A1 - Document ID: US20190168361A1 - Status: Published application - Kind: A1 - Application number: 16/132,994 - Filed: 2018-09-17 - Published: 2019-06-06 - Earliest claimed: 2017-12-06 - Assignees: JOBRA Metall GmbH - Applicants: JOBRA Metall GmbH - Inventors: Josef Brandstetter - Web page: https://patentgrep.com/patent/US20190168361A1 ## CPC - B24D 9/08: Circular back-plates for carrying flexible material - B24D 7/16: Bushings; Mountings - B24D 13/14: acting by the front face - B24D 13/18: with cooling provisions - B24D 13/20: Mountings for the wheels - B24D 18/00: Manufacture of grinding tools {or other grinding devices}, e.g. wheels, not otherwise provided for - B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11) ## Abstract A grinding disc device for a grinding apparatus is described, having at least one grinding layer and a carrier disc fixedly connected to the grinding layer. The grinding layer has at least one connection surface (FV) connected to the carrier disc and forms an abrasive grinding surface (FS) lying opposite the connection surface (FV) and facing away from the carrier disc. The carrier disc made of a plastic material is produced by injection molding and is connected immediately and directly to the connection surface (FV) of the grinding layer, wherein the plastic material of the carrier disc is sprayed by injection molding immediately and directly onto the connection surface (FV) of the grinding layer, such that the carrier disc and the grinding layer are connected to one another in a material-locking manner. ## Claims ### Claim 1 A grinding disc device for a grinding apparatus comprising: at least one grinding layer and a carrier disc fixedly connected to the grinding layer, wherein the grinding layer comprises a connection surface (FV) connected to the carrier disc and forms an abrasive grinding surface (FS) lying opposite the connection surface (FV) and facing away from the carrier disc, wherein the carrier disc is made of a plastic material produced by injection molding and is connected immediately and directly to the connection surface (FV) of the grinding layer, wherein the plastic material of the carrier disc is sprayed by means of injection molding immediately and directly onto the connection surface (FV) of the grinding layer, such that the carrier disc and the grinding layer are connected to one another in a materially-bonded manner. ### Claim 2 (depends on 1) The grinding disc device according to claim 1, wherein the grinding layer consists essentially of a flat, circular grinding disc or a sanding disc. ### Claim 3 (depends on 1) The grinding disc device according to claim 1, wherein the grinding layer is formed by a fiber disc or a vulcanised fiber disc. ### Claim 4 (depends on 1) The grinding disc device according to claim 1, wherein the grinding layer is composed of grinding lamellas. ### Claim 5 (depends on 1) The grinding disc device according to claim 1, wherein the connection surface (FV) and the grinding surface (FS) lying opposite the connection surface (FV) are each constituted as essentially continuous, annular surfaces. ### Claim 6 (depends on 1) The grinding disc device according to claim 1, wherein the grinding surface (FS) is formed by a ceramic grain abrasive medium scattered on a carrier material. ### Claim 7 (depends on 1) The grinding disc device according to any claim 1, wherein the grinding surface (FS) of the grinding layer connected to the carrier disc is constituted dish-shaped. ### Claim 8 (depends on 1) The grinding disc device according to claim 1, wherein cooling air slots are formed in the carrier disc distributed over a periphery of the carrier disc for passage of cooling air. ### Claim 9 (depends on 1) The grinding disc device according to claim 1, wherein the carrier disc is constituted in one piece with a hub part, wherein ventilation ribs extend radially outwards from the hub part. ### Claim 10 (depends on 9) The grinding disc device according to claim 9, wherein the hub part comprises an inner thread for the fastening of the grinding disc device on a drive shaft of the grinding apparatus. ### Claim 11 (depends on 9) The grinding disc device according to claim 9, wherein cooling air passage slots are also formed into the hub part. ### Claim 12 (depends on 1) The grinding disc device according to claim 1, wherein the carrier disc is produced from a thermoplastic polymer. ### Claim 13 (depends on 12) The grinding disc device according to claim 12, wherein the carrier disc is made from a thermoplastic terpolymeror an acrylnitrile-butadiene-styrene copolymer (ABS). ### Claim 14 (depends on 12) The grinding disc device according to claim 12, wherein the carrier disc is made from a polyamide PA6 or a glass fiber-reinforced polyamide PA6. ### Claim 15 A method for producing a grinding disc device for a grinding apparatus by injection molding, comprising the steps of: introducing a grinding layer with a connection surface (FV) and an opposite abrasive grinding surface (FS) into a molding tool of an injection molding machine, in such a way that the connection surface (FV) of the grinding layer points in a direction of a predefined cavity of the molding tool, forming a carrier disc connection to the grinding layer by injecting a plastic material suitable for producing the carrier disc into a closed molding tool at a predefined temperature and under a predefined pressure, such that the plastic material of the carrier disc is sprayed immediately and directly onto the connection surface (FV) of the grinding layer thereby producing the grinding disc device. ### Claim 16 (depends on 15) The method according to claim 15, wherein the carrier disc is constituted in one piece with a hub part and/or that slots distributed over the periphery of the carrier disc are formed for a passage of cooling air. ### Claim 17 (depends on 16) The method according to claim 16, wherein an inner thread is formed in the hub part for the fastening of the grinding disc device on a drive shaft of the grinding apparatus and/or that the hub part is formed with corresponding cooling air passage slots. ### Claim 18 (depends on 15) The method according to any one of claim 15, wherein a flat, circular vulcanised fiber disc with a scattered ceramic grain abrasive medium is used as a grinding layer and that a glass fiber-reinforced polyamide PA6 is the plastic material for the carrier disc sprayed onto the grinding layer.