# US 9,751,186 B2 · Battery-operated eccentric sander having an electronically commutated electric motor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,186 B2 - Document ID: US9751186B2 - Status: Granted - Kind: B2 - Application number: 14/498,549 - Filed: 2014-09-26 - Published: 2015-03-26 - Granted: 2017-09-05 - Earliest claimed: 2013-09-26 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Michael Sperl; Florian Esenwein - Web page: https://patentgrep.com/patent/US9751186B2 ## CPC - B24B 23/03: the tool being driven in a combined movement - B24B 55/102: {with rotating tools} - 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 battery-operated hand power tool, in particular an eccentric sander, includes at least one electronically commutated electric motor that acts upon an output shaft and that is configured to drive a working tool. The hand power tool further includes at least one motor housing part that accommodates the electronically commutated electric motor. The electronically commutated electric motor and the output shaft define a common first axis that is coaxial with the output shaft. At least one handle region of the hand power tool accommodates at least one set of electronics configured to energize the electronically commutated electric motor. The motor housing part and the handle region are disposed at an angle to each other. The working tool has a diameter that is between 75 and 150 mm, but preferably is between 115 and 125 mm. ## Claims ### Claim 1 A battery-operated hand power tool, comprising: at least one working tool; at least one electronically commutated electric motor configured to act upon an output shaft and to drive the working tool; at least one motor housing part configured to accommodate the electronically commutated electric motor, the electronically commutated electric motor and the output shaft defining a common first axis that is coaxial with the output shaft; and at least one handle region that is configured to accommodate at least one set of electronics configured to energize the electronically commutated electric motor, wherein the working tool has a diameter that is between 75 and 150 mm, and wherein a ratio of a length of the battery-operated hand power tool to a height along the first axis of the motor housing part is between 1.8 and 2.2. ### Claim 2 (depends on 1) The battery-operated hand power tool according to claim 1, wherein the handle region has at least one first grip region with a circumference that is between 110 and 200 mm to enable one-handed operation of the battery-operated hand power tool in each working position. ### Claim 3 (depends on 2) The battery-operated hand power tool according to claim 2, further comprising a second grip region disposed on the motor housing part, the second grip region being configured as a knob. ### Claim 4 (depends on 3) The battery-operated hand power tool according to claim 3, wherein a first length defined from an outer casing of the second grip region to a wall of the at least one motor housing part is between 5 and 30 mm. ### Claim 5 (depends on 4) The battery-operated hand power tool according to claim 4, wherein the first length is between 10 and 20 mm. ### Claim 6 (depends on 2) The battery-operated hand power tool according to claim 2, wherein the circumference of the at least one first grip region is between 150 and 175 mm. ### Claim 7 (depends on 1) The battery-operated hand power tool according to claim 1, wherein the electronically commutated electric motor drives a carrier shaft. ### Claim 8 (depends on 1) The battery-operated hand power tool according to claim 1, wherein the electronically commutated electric motor is configured as an internal-rotor motor. ### Claim 9 (depends on 1) The battery-operated hand power tool according to claim 1, further comprising at least one fan disposed in the first housing part, the fan being integrated between the electronically commutated electric motor and a receiver of the working tool. ### Claim 10 (depends on 1) The battery-operated hand power tool according to claim 1, further comprising at least one dust suction device integrated in the first housing part. ### Claim 11 (depends on 1) The battery-operated hand power tool according to claim 1, wherein the battery-operated hand power tool is configured as an eccentric sander, and wherein the diameter of the working tool is between 115 and 125 mm. ### Claim 12 (depends on 1) The battery-operated hand power tool according to claim 1, wherein the ratio of the length of the battery-operated hand power tool to the height along the first axis of the motor housing part is 2.0. ### Claim 13 A battery-operated hand power tool, comprising: at least one working tool; at least one electronically commutated electric motor configured to act upon an output shaft and to drive the working tool; at least one motor housing part configured to accommodate the electronically commutated electric motor, the electronically commutated electric motor and the output shaft defining a common first axis that is coaxial with the output shaft; and at least one handle region that is configured to accommodate at least one set of electronics configured to energize the electronically commutated electric motor, wherein the working tool has a diameter that is between 75 and 150 mm, and wherein a ratio of a length of the battery-operated hand power tool to a diameter of the working tool is between 1.2 and 2.8. ### Claim 14 (depends on 13) The battery-operated hand power tool according to claim 13, wherein the ratio of the length of the battery-operated hand power tool to the diameter of the working tool is between 1.4 and 1.8. ### Claim 15 A battery-operated hand power tool, comprising: at least one working tool; at least one electronically commutated electric motor configured to act upon an output shaft and to drive the working tool; at least one motor housing part configured to accommodate the electronically commutated electric motor, the electronically commutated electric motor and the output shaft defining a common first axis that is coaxial with the output shaft; and at least one handle region that is configured to accommodate at least one set of electronics configured to energize the electronically commutated electric motor, wherein the working tool has a diameter that is between 75 and 150 mm, and wherein a ratio of the diameter of the working tool to a diameter of the electronically commutated electric motor is less than or equal to 4.0. ### Claim 16 (depends on 15) The battery-operated hand power tool according to claim 15, wherein a ratio of a height along the first axis of the motor housing part to a diameter of the working tool is less than or equal to 1.15. ### Claim 17 (depends on 16) The battery-operated hand power tool according to claim 16, wherein the height of the motor housing part along the first axis is between 90 and 135 mm. ### Claim 18 (depends on 17) The battery-operated hand power tool according to claim 17, wherein the height of the motor housing part along the first axis is between 105 and 110 mm. ### Claim 19 (depends on 16) The battery-operated hand power tool according to claim 16, wherein the ratio of the height along the first axis of the motor housing part to the diameter of the working tool is less than 0.9.