# US 11,298,788 B2 · Electric power tool dust collection system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,298,788 B2 - Document ID: US11298788B2 - Status: Granted - Kind: B2 - Application number: 16/416,994 - Filed: 2019-05-20 - Published: 2019-12-19 - Granted: 2022-04-12 - Earliest claimed: 2018-06-19 - Assignees: Makita Corporation - Applicants: Makita Corporation - Inventors: Masanori Furusawa - Web page: https://patentgrep.com/patent/US11298788B2 ## CPC - B23Q 11/0046: {by sucking} - B25D 17/043: {Handles resiliently mounted relative to the hammer housing (B25D17/046 takes precedence)} - B23B 47/34: Arrangements for removing chips out of the holes made; Chip- breaking arrangements attached to the tool {(chip-breaking in turning machines B23B25/02; in turning tools B23B27/22)} - B23Q 11/0071: {dust collectors for hand tools} - B23Q 11/127: {for cooling motors or spindles} - B23B 2251/68: Drills with provision for suction - B23B 2270/30: Chip guiding or removal - B25D 17/02: Percussive tool bits {(drill bits for earth drilling E21B10/00)} - B25D 2211/003: Crossed drill and motor spindles - B25D 2211/068: Crank-actuated impulse-driving mechanisms - B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT - B25D: PERCUSSIVE TOOLS {(percussive machines for forging B21J; hand-held drilling machines, in general B23B45/00, for wood B27C3/08; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face E21B1/00)} - B23B: TURNING; BORING (arrangements for copying or controlling B23Q) ## Abstract An electric power tool dust collection system includes: a hammer drill, to which a dust suction bit is mounted; a dust collection device mounted to the hammer drill and including a suction portion (introduction port), a dust collection motor, a dust collection fan rotated by drive of the dust collection motor to generate a sucking force in the introduction port, and a dust collection portion (dust box) that stores powder dust suctioned from the introduction port; and exhaust flow paths (exhaust flow path and tubular flow path) respectively formed in the hammer drill and the dust collection device to lead exhaust that has passed through the dust box to a high-temperature portion (output portion) of the hammer drill. ## Claims ### Claim 1 An electric power tool dust collection system comprising: a hammer drill (1) that includes a hammer drill motor and a hammer drill fan, (2) configured to receive and retain a bit and (3) that includes an output portion with a striking mechanism; a dust collection device mounted to the hammer drill and including a suction portion, a dust collection motor, a dust collection fan rotated by drive of the dust collection motor to generate a sucking force in the suction portion, and a dust collection portion that stores powder dust suctioned from the suction portion; and a first exhaust flow path in the hammer drill and a second exhaust flow path in the dust collection device configured to lead exhaust air that has passed through the dust collection portion to the output portion in an interior of the hammer drill to cool the output portion; wherein: the dust collection motor is a separate motor from the hammer drill motor and the dust collection fan is a separate fan from the hammer drill fan; the output portion is tubular and extends along a longitudinal axis of the bit when the bit is retained by the hammer drill; and the output portion and the first exhaust flow path are configured such that the exhaust air directly contacts the output portion in the first exhaust flow path. ### Claim 2 (depends on 1) The electric power tool dust collection system according to claim 1, wherein the exhaust flow paths communicate with each other when the dust collection device is mounted to the hammer drill. ### Claim 3 (depends on 1) The electric power tool dust collection system according to claim 1, wherein the first exhaust flow path is also used as a flow path for cooling air generated by rotation of the hammer drill fan. ### Claim 4 (depends on 1) The electric power tool dust collection system according to claim 1, wherein the hammer drill includes a motor housing portion that houses the hammer drill motor with an output shaft directed upward, and the dust collection device is mounted in front of the motor housing portion. ### Claim 5 (depends on 4) The electric power tool dust collection system according to claim 4, wherein the dust collection device is mounted under the motor housing portion. ### Claim 6 (depends on 1) The electric power tool dust collection system according to claim 1, wherein the hammer drill includes a housing that is divided into a housing on an anti-vibration side and a housing on a non-anti-vibration side via an anti-vibration portion, and the first exhaust flow path in the hammer drill is formed in a space between the housing on the anti-vibration side and the housing on the non-anti-vibration side. ### Claim 7 (depends on 6) The electric power tool dust collection system according to claim 6, wherein the dust collection device is mounted to the housing on the anti-vibration side. ### Claim 8 (depends on 1) The electric power tool dust collection system according to claim 1, wherein the first exhaust flow path is tubular with an axis parallel to an axis of the bit when the bit is retained by the hammer drill. ### Claim 9 (depends on 8) The electric power tool dust collection system according to claim 8, wherein the first exhaust flow path is formed between an inner housing, which holds a tool holder into which the bit is inserted, and an outside housing, which covers an outside of the inner housing. ### Claim 10 (depends on 9) The electric power tool dust collection system according to claim 9, wherein the dust collection device is slid upward from a lower side of the hammer drill to be mounted. ### Claim 11 (depends on 10) The electric power tool dust collection system according to claim 10, wherein: the second exhaust flow path is formed to project upward from a casing of the dust collection device; and an exhaust introduction port, which communicates with the first exhaust flow path and into which the second exhaust flow path is inserted when the dust collection device is mounted, is formed in a lower surface of the outside housing. ### Claim 12 (depends on 1) The electric power tool dust collection system according to claim 1, wherein the dust collection portion is a dust box removably mounted to the dust collection device. ### Claim 13 (depends on 1) The electric power tool dust collection system according to claim 1, wherein the exhaust air passes circumferentially around the output portion. ### Claim 14 (depends on 9) The electric power tool dust collection system according to claim 9, wherein the exhaust air directly contacts the inner housing.