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).

  • Publication number: 20250144773
    Abstract: 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: Application
    Filed: January 10, 2025
    Publication date: May 8, 2025
    Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Hidenori NAGASAKA, Manabu SUGIMOTO
  • Patent number: 12220791
    Abstract: 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: Grant
    Filed: January 10, 2024
    Date of Patent: February 11, 2025
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Tokuo Hirabayashi, Hidenori Nagasaka, Manabu Sugimoto
  • Publication number: 20240359298
    Abstract: 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: Application
    Filed: July 8, 2024
    Publication date: October 31, 2024
    Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Tomoyuki KONDO
  • Patent number: 12064853
    Abstract: 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: Grant
    Filed: November 3, 2021
    Date of Patent: August 20, 2024
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Tokuo Hirabayashi, Tomoyuki Kondo
  • Publication number: 20240139915
    Abstract: 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: Application
    Filed: January 10, 2024
    Publication date: May 2, 2024
    Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Hidenori NAGASAKA, Manabu SUGIMOTO
  • Patent number: 11407091
    Abstract: 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: Grant
    Filed: September 22, 2020
    Date of Patent: August 9, 2022
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Akira Tomonaga, Kazuya Arakawa
  • Publication number: 20220055191
    Abstract: 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: Application
    Filed: November 3, 2021
    Publication date: February 24, 2022
    Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Tomoyuki KONDO
  • Patent number: 11247323
    Abstract: 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: Grant
    Filed: August 7, 2018
    Date of Patent: February 15, 2022
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Masahiro Watanabe, Jiro Suzuki, Kosuke Ito
  • Patent number: 11192223
    Abstract: 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: Grant
    Filed: December 18, 2017
    Date of Patent: December 7, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Tokuo Hirabayashi, Tomoyuki Kondo
  • Publication number: 20210276164
    Abstract: 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: Application
    Filed: May 21, 2021
    Publication date: September 9, 2021
    Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Hidenori NAGASAKA, Manabu SUGIMOTO
  • Patent number: 11045926
    Abstract: 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: Grant
    Filed: January 10, 2019
    Date of Patent: June 29, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Tokuo Hirabayashi, Hidenori Nagasaka, Manabu Sugimoto
  • Patent number: 10994404
    Abstract: 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: Grant
    Filed: November 9, 2018
    Date of Patent: May 4, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Miyabi Ito, Ryunosuke Kumagai, Shin Sugiura, Akira Mizutani, Takahiro Kawakami
  • Patent number: 10967496
    Abstract: 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: Grant
    Filed: January 7, 2019
    Date of Patent: April 6, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Tokuo Hirabayashi
  • Patent number: 10906163
    Abstract: 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: Grant
    Filed: October 16, 2019
    Date of Patent: February 2, 2021
    Assignee: MAKITA CORPORATION
    Inventors: Hidenori Nagasaka, Ryunosuke Kumagai, Koji Tsukamoto, Tomonori Kawase, Kosuke Ito, Tokuo Hirabayashi, Yasuhito Kawai
  • Publication number: 20210016420
    Abstract: 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: Application
    Filed: September 22, 2020
    Publication date: January 21, 2021
    Inventors: Ryunosuke KUMAGAI, Akira TOMONAGA, Kazuya ARAKAWA
  • Patent number: 10821577
    Abstract: 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: Grant
    Filed: January 26, 2018
    Date of Patent: November 3, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Ryunosuke Kumagai, Akira Tomonaga, Kazuya Arakawa
  • Publication number: 20200047319
    Abstract: 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: Application
    Filed: October 16, 2019
    Publication date: February 13, 2020
    Inventors: Hidenori NAGASAKA, Ryunosuke KUMAGAI, Koji TSUKAMOTO, Tomonori KAWASE, Kosuke ITO, Tokuo HIRABAYASHI, Yasuhito KAWAI
  • Publication number: 20200009709
    Abstract: 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: Application
    Filed: December 18, 2017
    Publication date: January 9, 2020
    Inventors: Ryunosuke KUMAGAI, Tokuo HIRABAYASHI, Tomoyuki KONDO
  • Patent number: 10491148
    Abstract: 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: Grant
    Filed: October 31, 2016
    Date of Patent: November 26, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Yoshitaka Ichikawa, Ryunosuke Kumagai, Tokuo Hirabayashi
  • Patent number: 10478950
    Abstract: 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: Grant
    Filed: November 21, 2016
    Date of Patent: November 19, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Hidenori Nagasaka, Ryunosuke Kumagai, Koji Tsukamoto, Tomonori Kawase, Kosuke Ito, Tokuo Hirabayashi, Yasuhito Kawai