# US 9,039,496 B2 · Grinding disk > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,496 B2 - Document ID: US9039496B2 - Status: Granted - Kind: B2 - Application number: 13/717,735 - Filed: 2012-12-18 - Published: 2013-06-20 - Granted: 2015-05-26 - Earliest claimed: 2011-12-20 - Assignees: Kolthoff Gabrovo EOOD - Applicants: Kolthoff & Co. - Inventors: Dieter Kolthoff - Web page: https://patentgrep.com/patent/US9039496B2 ## CPC - B24D 7/16: Bushings; Mountings - B24B 7/18: for grinding floorings, walls, ceilings or the like (machines or devices for cleaning floorings A47L11/00, A47L13/00) - B24B 7/186: {with disc-type tools} - B24B 23/02: with rotating grinding tools; Accessories therefor - B24D 9/08: Circular back-plates for carrying flexible material - B24D 13/147: {comprising assemblies of felted or spongy material; comprising pads surrounded by a flexible material} - B24D 13/20: Mountings for the wheels - 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) - B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS ## Abstract A grinding disk in particular for rotary fine machining of surfaces has a support plate and a drive connector connecting the grinding disk to a rotary drive machine. The drive connector is provided at a top side of the support plate. An elastically deformable cushion is disposed at a bottom side of the support plate. The cushion is covered with a working medium or with an adhesive coating for detachable attachment of a working medium disk. A cover is disposed on the support plate so as to define an axial intermediate spacing, wherein the cover is embodied as a mechanically loadable structural part and is connected fixedly at least to an outer rim of the support plate. Primarily radially extending ribs are disposed between the support plate and the cover and connected at least at some locations with the support plate and the cover. ## Claims ### Claim 1 A grinding disk in particular for rotary fine machining of surfaces, the grinding disk comprising: a support plate having a top side and a bottom side, wherein the top side comprises an outer annular wall and an inner annular wall; a drive connector adapted to connect the grinding disk to a rotary drive machine, the drive connector provided at the top side of the support plate, wherein the inner annular wall surrounds the drive connector at a radial spacing; an elastically deformable cushion disposed at the bottom side of the support plate, the cushion having a bottom surface covered with a working medium or with an adhesive coating for detachable attachment of a working medium disk; a cover disposed on the support plate so as to define an axial intermediate spacing, wherein the cover is annular and has an inner circumference and an outer circumference, wherein the inner circumference is fused or glued to the inner annular wall and the outer circumference is fused or glued to the outer annular wall and wherein the cover is a mechanically loadable structural part; primarily radially extending ribs extending between the outer annular wall and the inner annular wall and disposed between the support plate and the cover and connected at least at some locations with the support plate and the cover. ### Claim 2 (depends on 1) The grinding disk according to claim 1, wherein the cover, the support plate, and the ribs are connected with each other by material fusion. ### Claim 3 (depends on 1) The grinding disk according to claim 1, wherein the ribs are fused or glued to the cover, the support plate; or the cover and the support plate. ### Claim 4 (depends on 1) The grinding disk according to claim 1, wherein the ribs are connected by fastening elements to the cover, the support plate; or the cover and the support plate. ### Claim 5 (depends on 1) The grinding disk according to claim 1, wherein the ribs are monolithically formed together with the cover or together with the support plate. ### Claim 6 (depends on 1) The grinding disk according to claim 1, wherein the cover is recessed into the support plate at the outer circumference so as to be flush with an upper end of the outer annular wall of the support plate and is resting in tight fit radially with an outer edge against an inner edge of the outer annular wall of the support plate. ### Claim 7 (depends on 1) The grinding disk according to claim 1, wherein the inner circumference of the cover is resting radially against an outwardly facing edge of the inner annular wall of the support plate. ### Claim 8 (depends on 1) The grinding disk according to claim 1, wherein between the cover and the support plate hollow spaces are defined between the ribs and the hollow spaces are filled with fill members of a strong but lightweight material. ### Claim 9 (depends on 8) The grinding disk according to claim 8, wherein the fill members are made of rigid plastic foam. ### Claim 10 (depends on 9) The grinding disk according to claim 9, wherein the rigid plastic foam is disposed in the hollow spaces as a foaming material and exhibits strong adhesion to the cover and the support plate. ### Claim 11 (depends on 10) The grinding disk according to claim 10, wherein the foaming material is a polyurethane foam. ### Claim 12 (depends on 1) The grinding disk according to claim 1, wherein the drive connector has at least one connecting element made of a high-strength material that is embedded at least circumferentially in the support plate. ### Claim 13 (depends on 12) The grinding disk according to claim 12, wherein the high-strength material is metal.