Patents by Inventor Ryunosuke Kumagai
Ryunosuke Kumagai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20250144773Abstract: An impact driver or impact tool includes a motor, a motor housing that houses the motor, a grip housing integrally provided with the motor housing, a hammer case is disposed frontward of the motor housing, a spindle rotated by the motor, a hammer housed inside the hammer case and configured to be rotated by the spindle, and an anvil housed inside the hammer case which anvil is configured to be impacted by the hammer. In this impact driver, a length from a rear end of the motor housing to a front end of the anvil (i.e., the front-rear length of a main body) is less than 128 mm.Type: ApplicationFiled: January 10, 2025Publication date: May 8, 2025Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Hidenori NAGASAKA, Manabu SUGIMOTO
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Patent number: 12220791Abstract: An impact tool includes a brushless motor having a rotor extending in a front-rear direction and disposed in a motor housing constituted by left, right and rear motor housings. A battery pack is disposed below the motor housing in an up-down direction. A plurality of first screws extend in a left-right direction and fix the left motor housing to the right motor housing. A plurality of second screws extend in the front-rear direction and fix the rear motor housing to the left and right motor housings. A fan is disposed between the rotor and the rear motor housing, a grip housing is disposed downward of the motor housing, and a planetary gear mechanism is disposed frontward of the motor. A spindle is disposed frontward of the planetary gear mechanism, a hammer is disposed on an outer circumference of the spindle, and an anvil is disposed frontward of the hammer.Type: GrantFiled: January 10, 2024Date of Patent: February 11, 2025Assignee: MAKITA CORPORATIONInventors: Ryunosuke Kumagai, Tokuo Hirabayashi, Hidenori Nagasaka, Manabu Sugimoto
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Publication number: 20240359298Abstract: A power tool includes an anvil (14) operably driven by a motor (10); an insertion hole (91) defined the anvil, into which a bit is insertable; a through hole (92) extending radially from the insertion hole; a ball (93) disposed in the through hole; and a manually-movable sleeve (99) mounted around on the anvil and being axially slidable relative to the anvil. At a retracted position, the manually-movable sleeve presses the ball radially inwardly. At an advanced position, the manually-movable sleeve releases the pressing of the ball. A flat spring (97) is configured to bias the ball radially inwardly. The manually-movable sleeve has a length such that the flat spring is exposed at the advanced position.Type: ApplicationFiled: July 8, 2024Publication date: October 31, 2024Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Tomoyuki KONDO
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Patent number: 12064853Abstract: An impact tool (1; 1A) includes a spindle (12) rotated by a motor (10) and a hammer (70) rotated by the spindle. The hammer is designed to impact an anvil (14) in a rotational direction. A case (8) houses the hammer. A bearing (78A, 78B) is disposed between the hammer case and the anvil. An O-ring (84) is disposed between the anvil and the bearing.Type: GrantFiled: November 3, 2021Date of Patent: August 20, 2024Assignee: MAKITA CORPORATIONInventors: Ryunosuke Kumagai, Tokuo Hirabayashi, Tomoyuki Kondo
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Publication number: 20240139915Abstract: An impact tool includes a brushless motor having a rotor extending in a front-rear direction and disposed in a motor housing constituted by left, right and rear motor housings. A battery pack is disposed below the motor housing in an up-down direction. A plurality of first screws extend in a left-right direction and fix the left motor housing to the right motor housing. A plurality of second screws extend in the front-rear direction and fix the rear motor housing to the left and right motor housings. A fan is disposed between the rotor and the rear motor housing, a grip housing is disposed downward of the motor housing, and a planetary gear mechanism is disposed frontward of the motor. A spindle is disposed frontward of the planetary gear mechanism, a hammer is disposed on an outer circumference of the spindle, and an anvil is disposed frontward of the hammer.Type: ApplicationFiled: January 10, 2024Publication date: May 2, 2024Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Hidenori NAGASAKA, Manabu SUGIMOTO
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Patent number: 11407091Abstract: A power tool includes a motor disposed in a motor housing, a handle extending downward from the motor housing, a main switch provided on the handle and configured to switch the motor ON and OFF, and a state-changing operation part located on a lower portion of the motor housing or on an upper-end portion of the handle. The state-changing operation part is located upward of the main switch and is configured to effect a change of a rotational state of the motor, other than a direction of rotation of the motor, or an illumination level of a light.Type: GrantFiled: September 22, 2020Date of Patent: August 9, 2022Assignee: MAKITA CORPORATIONInventors: Ryunosuke Kumagai, Akira Tomonaga, Kazuya Arakawa
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Publication number: 20220055191Abstract: An impact tool (1; 1A) includes a spindle (12) rotated by a motor (10) and a hammer (70) rotated by the spindle. The hammer is designed to impact an anvil (14) in a rotational direction. A case (8) houses the hammer. A bearing (78A, 78B) is disposed between the hammer case and the anvil. An O-ring (84) is disposed between the anvil and the bearing.Type: ApplicationFiled: November 3, 2021Publication date: February 24, 2022Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Tomoyuki KONDO
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Patent number: 11247323Abstract: An electric working machine in one aspect of the present disclosure includes a motor, a setter, and a controller. The setter is configured to modifiably set a change characteristic in changing a rotational state of the motor from a low speed rotation to a high speed rotation. The high speed rotation is greater than the low speed rotation in rotational frequency of the motor.Type: GrantFiled: August 7, 2018Date of Patent: February 15, 2022Assignee: MAKITA CORPORATIONInventors: Ryunosuke Kumagai, Masahiro Watanabe, Jiro Suzuki, Kosuke Ito
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Patent number: 11192223Abstract: An impact tool (1; 1A) includes a spindle (12) rotated by a motor (10) and a hammer (70) held by the spindle. The hammer is designed to impact an anvil (14) in a rotational direction. A case (8) houses the hammer. A first bearing (78A) and a second bearing (78B) are held in the case and arranged along the axial direction. The first bearing and the second bearing directly hold the anvil in a rotatable manner.Type: GrantFiled: December 18, 2017Date of Patent: December 7, 2021Assignee: MAKITA CORPORATIONInventors: Ryunosuke Kumagai, Tokuo Hirabayashi, Tomoyuki Kondo
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Publication number: 20210276164Abstract: An impact driver or impact tool includes a motor, a motor housing that houses the motor, a grip housing integrally provided with the motor housing, a hammer case is disposed frontward of the motor housing, a spindle rotated by the motor, a hammer housed inside the hammer case and configured to be rotated by the spindle, and an anvil housed inside the hammer case which anvil is configured to be impacted by the hammer. In this impact driver, a length from a rear end of the motor housing to a front end of the anvil (i.e., the front-rear length of a main body) is less than 128 mm.Type: ApplicationFiled: May 21, 2021Publication date: September 9, 2021Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Hidenori NAGASAKA, Manabu SUGIMOTO
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Patent number: 11045926Abstract: An impact driver or impact tool includes a motor, a motor housing that houses the motor, a grip housing integrally provided with the motor housing, a hammer case is disposed frontward of the motor housing, a spindle rotated by the motor, a hammer housed inside the hammer case and configured to be rotated by the spindle, and an anvil housed inside the hammer case which anvil is configured to be impacted by the hammer. In this impact driver, a length from a rear end of the motor housing to a front end of the anvil (i.e., the front-rear length of a main body) is less than 128 mm.Type: GrantFiled: January 10, 2019Date of Patent: June 29, 2021Assignee: MAKITA CORPORATIONInventors: Ryunosuke Kumagai, Tokuo Hirabayashi, Hidenori Nagasaka, Manabu Sugimoto
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Patent number: 10994404Abstract: An electric tool, such as an angle driver, has a main tool body with a front portion and a rear portion positioned opposite to the front portion. The main tool body houses a motor configured to receive electricity to function as a drive source. A gear head is coupled with the front portion of the main tool body wherein the gear head has a spindle in communication with a motor axis of the motor via mesh-engagement of bevel gears associated with the motor axis. The spindle has with a cutter tool accessory attached thereto such that rotation of the motor axis produces a commensurate rotation of the cutter tool accessory. Battery attachment portions are associated with the rear portion of the main tool body and are configured to receive a corresponding set of batteries that provide electricity to power the motor.Type: GrantFiled: November 9, 2018Date of Patent: May 4, 2021Assignee: MAKITA CORPORATIONInventors: Miyabi Ito, Ryunosuke Kumagai, Shin Sugiura, Akira Mizutani, Takahiro Kawakami
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Patent number: 10967496Abstract: An impact driver includes a motor, a spindle rotated by the motor, a hammer that is movable forward and rearward with respect to the spindle and that has an inner peripheral portion facing the spindle, and an anvil struck in a rotational direction by the hammer. A grease supply path is provided to supply grease to the inner peripheral portion of the hammer.Type: GrantFiled: January 7, 2019Date of Patent: April 6, 2021Assignee: MAKITA CORPORATIONInventors: Ryunosuke Kumagai, Tokuo Hirabayashi
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Patent number: 10906163Abstract: A power tool includes a tool-main-body part, an electric motor as a drive source, a grip part, which extends downward from the tool-main-body part and is configured to be gripped by a user, and a power-supply unit at a tip of the grip part. The power tool includes a controller configured to control the operation of the electric motor, the controller being located on the power-supply unit, and a display controlled by the controller and configured to indicate an operating state of the electric motor. The controller and the display each have a flat-plate shape and are disposed along a surface direction with respect to one another, and the display includes a first portion that overlies the controller and a second portion that projects beyond an end edge of the controller.Type: GrantFiled: October 16, 2019Date of Patent: February 2, 2021Assignee: MAKITA CORPORATIONInventors: Hidenori Nagasaka, Ryunosuke Kumagai, Koji Tsukamoto, Tomonori Kawase, Kosuke Ito, Tokuo Hirabayashi, Yasuhito Kawai
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Publication number: 20210016420Abstract: A power tool includes a motor disposed in a motor housing, a handle extending downward from the motor housing, a main switch provided on the handle and configured to switch the motor ON and OFF, and a state-changing operation part located on a lower portion of the motor housing or on an upper-end portion of the handle. The state-changing operation part is located upward of the main switch and is configured to effect a change of a rotational state of the motor, other than a direction of rotation of the motor, or an illumination level of a light.Type: ApplicationFiled: September 22, 2020Publication date: January 21, 2021Inventors: Ryunosuke KUMAGAI, Akira TOMONAGA, Kazuya ARAKAWA
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Patent number: 10821577Abstract: A power tool includes a motor disposed in a motor housing, a handle extending downward from the motor housing, a main switch provided on the handle and configured to switch the motor ON and OFF, and a state-changing operation part located on a lower portion of the motor housing or on an upper-end portion of the handle. The state-changing operation part is located upward of the main switch and is configured to effect a change of a rotational state of the motor, other than a direction of rotation of the motor, or an illumination level of a light.Type: GrantFiled: January 26, 2018Date of Patent: November 3, 2020Assignee: MAKITA CORPORATIONInventors: Ryunosuke Kumagai, Akira Tomonaga, Kazuya Arakawa
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Publication number: 20200047319Abstract: A power tool includes a tool-main-body part, an electric motor as a drive source, a grip part, which extends downward from the tool-main-body part and is configured to be gripped by a user, and a power-supply unit at a tip of the grip part. The power tool includes a controller configured to control the operation of the electric motor, the controller being located on the power-supply unit, and a display controlled by the controller and configured to indicate an operating state of the electric motor. The controller and the display each have a flat-plate shape and are disposed along a surface direction with respect to one another, and the display includes a first portion that overlies the controller and a second portion that projects beyond an end edge of the controller.Type: ApplicationFiled: October 16, 2019Publication date: February 13, 2020Inventors: Hidenori NAGASAKA, Ryunosuke KUMAGAI, Koji TSUKAMOTO, Tomonori KAWASE, Kosuke ITO, Tokuo HIRABAYASHI, Yasuhito KAWAI
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Publication number: 20200009709Abstract: An impact tool (1; 1A) includes a spindle (12) rotated by a motor (10) and a hammer (70) held by the spindle. The hammer is designed to impact an anvil (14) in a rotational direction. A case (8) houses the hammer. A first bearing (78A) and a second bearing (78B) are held in the case and arranged along the axial direction. The first bearing and the second bearing directly hold the anvil in a rotatable manner.Type: ApplicationFiled: December 18, 2017Publication date: January 9, 2020Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Tomoyuki KONDO
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Patent number: 10491148Abstract: An electric working machine in one aspect of the present disclosure comprises a motor, a first operation unit, a control unit, a second operation unit, and a storage unit. The storage unit stores a reference speed that is set via the second operation unit. The control unit drives the motor at a rotation speed corresponding to a drive command from the first operation unit, in accordance with a control characteristic that is set based on the reference speed stored in the storage unit.Type: GrantFiled: October 31, 2016Date of Patent: November 26, 2019Assignee: MAKITA CORPORATIONInventors: Yoshitaka Ichikawa, Ryunosuke Kumagai, Tokuo Hirabayashi
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Patent number: 10478950Abstract: A power tool includes a tool-main-body part, an electric motor as a drive source, a grip part, which extends downward from the tool-main-body part and is configured to be gripped by a user, and a power-supply unit at a tip of the grip part. The power tool includes a controller configured to control the operation of the electric motor, the controller being located on the power-supply unit, and a display controlled by the controller and configured to indicate an operating state of the electric motor. The controller and the display each have a flat-plate shape and are disposed along a surface direction with respect to one another, and the display includes a first portion that overlies the controller and a second portion that projects beyond an end edge of the controller.Type: GrantFiled: November 21, 2016Date of Patent: November 19, 2019Assignee: MAKITA CORPORATIONInventors: Hidenori Nagasaka, Ryunosuke Kumagai, Koji Tsukamoto, Tomonori Kawase, Kosuke Ito, Tokuo Hirabayashi, Yasuhito Kawai