# US 11,305,359 B2 · Device for securing a boring bar > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,305,359 B2 - Document ID: US11305359B2 - Status: Granted - Kind: B2 - Application number: 16/642,902 - Filed: 2019-08-02 - Published: 2021-12-09 - Granted: 2022-04-19 - Earliest claimed: 2019-02-26 - Applicants: Hubert Kimmich - Inventors: Hubert Kimmich - Web page: https://patentgrep.com/patent/US11305359B2 ## CPC - B23B 27/007: {for internal turning (boring bars B23B29/02, boring heads B23B29/03; milling cutters B23C5/00; reamers B23D77/00)} - B23B 29/02: Boring bars - B23B 29/04: Tool holders for a single cutting tool - B23B 31/1075: {Retention by screws} - B23B 29/022: {with vibration reducing means} - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) ## Abstract A fixing device for fixing a boring bar on a material-removing machine includes a reducing sleeve with a hollow profile arranged on a front face which faces away from a machine chuck. The boring bar is received in an interior of the hollow profile. An end region of the boring bar projects from the hollow profile and carries a cutting tool. The hollow profile has a wall arranged between the interior and an exterior of the hollow profile. The wall has a first thickness and a second thickness. The first thickness is less than the second thickness. The first thickness is established at a side of the fixing device where the cutting tool projects radially from the boring bar. A longitudinal axis of the hollow profile is parallel to and at a distance from the axis of the reducing sleeve which is coaxial with the interior of the boring bar. ## Claims ### Claim 1 A fixing device for fixing a boring bar on a material-removing machine, the fixing device comprising: a cylindrical reducing sleeve configured to be fixed in a machine chuck, the cylindrical reducing sleeve comprising a longitudinal recess and a hollow profile which is arranged on a front face of the cylindrical reducing sleeve which faces away from the machine chuck, the hollow profile comprising an interior which is coaxial with an axis of the cylindrical reducing sleeve, wherein, the boring bar is configured to be received in the interior of the hollow profile, the boring bar comprising an end region which is arranged to project from the hollow profile and to carry a cutting tool, the hollow profile further comprises a wall which is configured to stabilize the boring bar, the wall being arranged between the interior of the hollow profile and an exterior of the hollow profile, the wall comprising a first thickness and at least a second thickness, the first thickness being less than the second thickness, wherein the first thickness is established at a side of the fixing device where the cutting tool projects radially from the boring bar, a longitudinal axis of the hollow profile is arranged to be axially parallel to and at a distance from the axis of the cylindrical reducing sleeve which is coaxial with the boring bar, and the hollow profile is inserted and fixed in the longitudinal recess of the cylindrical reducing sleeve. ### Claim 2 (depends on 1) The fixing device as recited in claim 1, wherein the interior of the hollow profile is cylindrical. ### Claim 3 (depends on 1) The fixing device as recited in claim 1, wherein the exterior of the hollow profile is configured to be cylindrical with a circular cross section or with an oval cross section. ### Claim 4 (depends on 1) The fixing device as recited in claim 1, wherein the hollow profile outer wall has a cross section having at least one flattened region. ### Claim 5 (depends on 1) The fixing device as recited in claim 1, wherein the first thickness is ½ to 1/30 of the second thickness. ### Claim 6 (depends on 1) The fixing device as recited in claim 1, wherein the hollow profile is integrally molded on the front face of the cylindrical reducing sleeve. ### Claim 7 (depends on 1) The fixing device as recited in claim 1, wherein the hollow profile is inserted and fixed in the longitudinal recess of the cylindrical reducing sleeve so as to be length adjustable. ### Claim 8 (depends on 1) The fixing device as recited in claim 1, wherein, the boring bar further comprises a diameter, and a distance of the longitudinal axis of the hollow profile from the axis of the cylindrical reducing sleeve which is coaxial with the boring bar is 1/10 to 1/30 of the diameter of the boring bar. ### Claim 9 (depends on 8) The fixing device as recited in claim 8, wherein the distance of the longitudinal axis of the hollow profile from the axis of the cylindrical reducing sleeve which is coaxial with the boring bar is ¼ to ¾ of the diameter of the boring bar. ### Claim 10 (depends on 1) The fixing device as recited in claim 1, wherein, on a side or in a region of the fixing device from which the cutting tool projects, the wall of the hollow profile has a thickness which is less than a thickness of the wall in remaining sides/regions. ### Claim 11 A fixing device for fixing a boring bar on a material-removing machine, the fixing device comprising: a reducing sleeve which is fixed in a machine chuck, the reducing sleeve comprising a longitudinal recess and a hollow profile which is arranged on a front face of the reducing sleeve which faces away from the machine chuck, the hollow profile comprising an interior which is coaxial with an axis of the reducing sleeve, wherein, the hollow profile is inserted and fixed in the longitudinal recess of the reducing sleeve, the boring bar projects axially along the axis of the reducing sleeve at a front end which faces away from the machine chuck, the machine chuck and the boring bar rotate about a same axis of rotation, the boring bar comprises an outer projecting end region which is configured to carry a cutting tool, and an outer wall which comprises a cylindrical boring bar outer wall and a flattened outer wall region, and the cylindrical boring bar outer wall is cylindrical with a boring bar axis of rotation as a cylinder axis with the exception of the flattened outer wall region of the outer wall, the cutting tool projecting from the boring bar at an end of the flattened outer wall region and the flattened outer wall region being arranged between the reducing sleeve and the cutting tool so that, in the flattened outer wall region, the outer wall has a first radius which is less than a second radius of the outer wall at the cylindrical boring bar outer wall. ### Claim 12 (depends on 11) The fixing device as recited in claim 11, wherein the first radius of the boring bar in the flattened outer wall region of the outer wall is ½ to 9/10 of the second radius of the cylindrical boring bar outer wall of the outer wall. ### Claim 13 (depends on 11) The fixing device as recited in claim 11, wherein, the reducing sleeve has the same axis of rotation as the boring bar, and the boring bar is inserted off-center in the clamping sleeve. ### Claim 14 (depends on 11) The fixing device as recited in claim 11, wherein, the reducing sleeve further comprises a same axis of rotation as the boring bar, and wherein, the boring bar is inserted off-center in the reducing sleeve. ### Claim 15 (depends on 11) The fixing device as recited in claim 11, wherein a cross-sectional area of the boring bar in a region remote from the cutting tool is greater than in a region closer to the cutting tool so that a reduction of the cross-sectional area decreases from a clamping point to the cutting tool. ### Claim 16 (depends on 15) The fixing device as recited in claim 15, wherein the reduction in the cross-sectional area of the boring bar occurs stepwise. ### Claim 17 A system for removing material, the system comprising: a material-removing machine comprising a machine chuck; a boring bar; and a fixing device for fixing the boring bar on the material-removing machine, the fixing device comprising a cylindrical reducing sleeve which is configured to be fixed in the machine chuck of the material-removing machine, the cylindrical reducing sleeve comprising a longitudinal recess and a hollow profile which is arranged on a front face of the cylindrical reducing sleeve which faces away from the machine chuck, the hollow profile comprising an interior which is coaxial with an axis of the cylindrical reducing sleeve, wherein, the boring bar is configured to be received in the interior of the hollow profile, the boring bar comprising an end region which is arranged to project from the hollow profile and to carry a cutting tool, the hollow profile further comprises a wall which is configured to stabilize the boring bar, the wall being arranged between the interior of the hollow profile and an exterior of the hollow profile, the wall comprising a first thickness and at least a second thickness the first thickness being less than the second thickness, wherein the first thickness is established at a side of the fixing device where the cutting tool projects radially from the boring bar, a longitudinal axis of the hollow profile is arranged to be axially parallel to and at a distance from the axis of the cylindrical reducing sleeve which is coaxial with the boring bar, and the hollow profile is inserted and fixed in the longitudinal recess of the cylindrical reducing sleeve. ### Claim 18 A fixing device for fixing a boring bar on a material-removing machine, the fixing device comprising: a cylindrical reducing sleeve configured to be fixed in a machine chuck, the cylindrical reducing sleeve comprising a hollow profile which is arranged on a front face of the cylindrical reducing sleeve which faces away from the machine chuck, the hollow profile comprising an interior which is coaxial with an axis of the cylindrical reducing sleeve, wherein, the boring bar is configured to be received in the interior of the hollow profile, the boring bar comprising an end region which is arranged to project from the hollow profile and to carry a cutting tool, the hollow profile further comprises a wall which is configured to stabilize the boring bar, the wall being arranged between the interior of the hollow profile and an exterior of the hollow profile, the wall comprising a first thickness and at least a second thickness, the first thickness being ½ to 1/30 of the second thickness, wherein the first thickness is established at a side of the fixing device where the cutting tool projects radially from the boring bar, and a longitudinal axis of the hollow profile is arranged to be axially parallel to and at a distance from the axis of the cylindrical reducing sleeve which is coaxial with the interior of the boring bar.