# US 11,441,569 B2 · Blower > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,569 B2 - Document ID: US11441569B2 - Status: Granted - Kind: B2 - Application number: 17/029,530 - Filed: 2020-09-23 - Published: 2021-03-25 - Granted: 2022-09-13 - Earliest claimed: 2019-09-24 - Assignees: Makita Corporation - Applicants: Makita Corporation - Inventors: Shinsuke Naka - Web page: https://patentgrep.com/patent/US11441569B2 ## CPC - F04D 25/0673: {Battery powered} - A01G 20/47: Vacuum or blower devices - A47L 5/14: cleaning by blowing-off, also combined with suction cleaning - A47L 9/2842: {Suction motors or blowers} - E01H 1/0809: {Loosening or dislodging by blowing (combined with suction E01H1/0863; with steam E01H1/10; removing snow by blowing E01H5/106; cleaning rails by blowing E01H8/105, E01H8/125; removing fog by blowing E01H13/00; cleaning joints in road construction by blowing E01C23/0906); Drying by means of gas streams (combined with snow or ice melting E01H5/10)} - F04D 17/16: for displacing without appreciable compression - F04D 19/002: {Axial flow fans} - F04D 25/084: {hand fans} - F04D 29/422: {Discharge tongues (F04D17/04 takes precedence)} - F04D 29/4226: {Fan casings} - F04D 29/522: {especially adapted for elastic fluid pumps} - F04D 29/626: {Mounting or removal of fans} - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - A01G: HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING (picking of fruits, vegetables, hops or the like A01D46/00; propagating unicellular algae C12N1/12) - A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08) - E01H: STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING {OR PREVENTING} FOG IN GENERAL {CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS}(cleaning in general B08B) ## Abstract A blower may include a plurality of batteries; a centrifugal fan configured to change a flow direction of air from a first direction extending along the rotation axis to a radially outward direction of the rotation axis; a volute casing including a discharge port and configured to guide the air from the centrifugal fan along a circumferential direction of the rotation axis to the discharge port; and a main grip disposed radially outward of the rotation axis and outside of the volute casing and configured to be gripped by an operator. A central axis of the main grip may extend along a reference plane perpendicular to the rotation axis. A distance from the reference plane to a center of gravity of the blower may be less than or equal to 1.5 times a width of the main grip. ## Claims ### Claim 1 A blower, comprising: a plurality of batteries; a motor configured to operate by electric power supplied from the plurality of batteries; a centrifugal fan configured to rotate about a rotation axis by being driven by the motor and configured to change a flow direction of air from a first direction extending along the rotation axis to a radially outward direction of the rotation axis; a volute casing including a discharge port and configured to guide the air from the centrifugal fan along a circumferential direction of the rotation axis to the discharge port; and a main grip disposed radially outward of the rotation axis and outside of the volute casing and configured to be gripped by an operator, wherein a central axis of the main grip extends along a reference plane perpendicular to the rotation axis, a distance from the reference plane to a center of gravity of the blower is less than or equal to 1.5 times a width of the main grip, and when the blower is viewed along the rotation axis, the center of gravity of each of the plurality of batteries is disposed on a discharge port side relative to the main grip. ### Claim 2 (depends on 1) The blower according to claim 1, wherein when the blower is viewed along the rotation axis, the center of gravity of the blower is disposed on a discharge port side relative to the main grip. ### Claim 3 (depends on 1) The blower according to claim 1, wherein a distance from the reference plane to a center of gravity of each of the plurality of batteries is less than or equal to 1.5 times the width of the main grip. ### Claim 4 (depends on 1) The blower according to claim 1, wherein with respect to a direction in which the central axis extends, one end of the main grip is disposed on a discharge port side relative to another end of the main grip, and when the blower is viewed along the rotation axis, a center of gravity of the motor is disposed on the other end side relative to the one end of the main grip and on a one end side relative to the other end of the main grip. ### Claim 5 (depends on 1) The blower according to claim 1, further comprising a base member fixed to the volute casing, wherein in a state where the blower is placed on a placement plane, only the base member is in contact with the placement plane. ### Claim 6 (depends on 5) The blower according to claim 5, wherein the base member comprises a sub grip disposed radially outward of the rotation axis and configured to be gripped by the operator, and when the blower is viewed along the rotation axis, the center of gravity of the blower is disposed between the main grip and the sub grip. ### Claim 7 (depends on 6) The blower according to claim 6, wherein the volute casing further includes a suction port configured to supply air from outside of the blower into the volute casing, the air flows through the suction port in the first direction, and the plurality of batteries is attached to the volute casing by being slid in a second direction that is opposite to the first direction and is detached from the volute casing by being slid in the first direction. ### Claim 8 (depends on 1) The blower according to claim 1, wherein the batteries are electrically connected in series. ### Claim 9 (depends on 1) The blower according to claim 1, wherein the batteries are electrically connected in parallel. ### Claim 10 A blower, comprising: a plurality of batteries; a motor configured to operate by electric power supplied from the plurality of batteries; a centrifugal fan configured to rotate about a rotation axis by being driven by the motor and configured to change a flow direction of air from a first direction extending along the rotation axis to a radially outward direction of the rotation axis; a volute casing including a discharge port and configured to guide the air from the centrifugal fan along a circumferential direction of the rotation axis to the discharge port; and a main grip disposed radially outward of the rotation axis and outside of the volute casing and configured to be gripped by an operator, wherein a central axis of the main grip extends along a reference plane perpendicular to the rotation axis, a distance from the reference plane to a center of gravity of the blower is less than or equal to 1.5 times a width of the main grip, with respect to a direction in which the central axis extends, one end of the main grip is disposed on a discharge port side relative to another end of the main grip, and when the blower is viewed along the rotation axis, a center of gravity of the motor is disposed on the other end side relative to the one end of the main grip and on a one end side relative to the other end of the main grip. ### Claim 11 (depends on 10) The blower according to claim 10, wherein when the blower is viewed along the rotation axis, the center of gravity of the blower is disposed on a discharge port side relative to the main grip. ### Claim 12 (depends on 10) The blower according to claim 10, wherein a distance from the reference plane to a center of gravity of each of the plurality of batteries is less than or equal to 1.5 times the width of the main grip. ### Claim 13 (depends on 10) The blower according to claim 10, further comprising a base member fixed to the volute casing, wherein in a state where the blower is placed on a placement plane, only the base member is in contact with the placement plane. ### Claim 14 (depends on 13) The blower according to claim 13, wherein the base member comprises a sub grip disposed radially outward of the rotation axis and configured to be gripped by the operator, and when the blower is viewed along the rotation axis, the center of gravity of the blower is disposed between the main grip and the sub grip. ### Claim 15 (depends on 14) The blower according to claim 14, wherein the volute casing further includes a suction port configured to supply air from outside of the blower into the volute casing, the air flows through the suction port in the first direction, and the plurality of batteries is attached to the volute casing by being slid in a second direction that is opposite to the first direction and is detached from the volute casing by being slid in the first direction. ### Claim 16 A blower, comprising: a plurality of batteries; a motor configured to operate by electric power supplied from the plurality of batteries; a centrifugal fan configured to rotate about a rotation axis by being driven by the motor and configured to change a flow direction of air from a first direction extending along the rotation axis to a radially outward direction of the rotation axis; a volute casing including a discharge port and configured to guide the air from the centrifugal fan along a circumferential direction of the rotation axis to the discharge port; and a main grip disposed radially outward of the rotation axis and outside of the volute casing and configured to be gripped by an operator, wherein a central axis of the main grip extends along a reference plane perpendicular to the rotation axis, a distance from the reference plane to a center of gravity of the blower is less than or equal to 1.5 times a width of the main grip, the blower further comprises a base member fixed to the volute casing, in a state where the blower is placed on a placement plane, only the base member is in contact with the placement plane, the base member comprises a sub grip disposed radially outward of the rotation axis and configured to be gripped by the operator, and when the blower is viewed along the rotation axis, the center of gravity of the blower is disposed between the main grip and the sub grip. ### Claim 17 (depends on 16) The blower according to claim 16, wherein the volute casing further includes a suction port configured to supply air from outside of the blower into the volute casing, the air flows through the suction port in the first direction, and the plurality of batteries is attached to the volute casing by being slid in a second direction that is opposite to the first direction and is detached from the volute casing by being slid in the first direction. ### Claim 18 (depends on 16) The blower according to claim 16, wherein when the blower is viewed along the rotation axis, the center of gravity of the blower is disposed on a discharge port side relative to the main grip. ### Claim 19 (depends on 16) The blower according to claim 16, wherein a distance from the reference plane to a center of gravity of each of the plurality of batteries is less than or equal to 1.5 times the width of the main grip.