公开(公告)号：US12186862B2

公开(公告)日：2025-01-07

申请号：US18196497

申请日：2023-05-12

Applicant: MAKITA CORPORATION

Inventor： Yasuhito Kawai

IPC: B25B21/00 ,  B25B21/02 ,  B25F5/02 ,  H02K5/173 ,  H02K7/08 ,  H02K7/14

Abstract: An electric work machine has less size increase. An electric work machine includes a motor including a stator and a rotor at least partially located radially inward from the stator and rotatable about a rotation axis, a spindle located frontward from the stator in a front-rear direction parallel to the rotation axis and rotatable under a rotational force generated by the rotor, and a spindle bearing supporting a rear portion of the spindle in a rotatable manner. The spindle bearing is located radially inward from the stator.

公开(公告)号：US12017313B2

公开(公告)日：2024-06-25

申请号：US17958902

申请日：2022-10-03

Applicant: MAKITA CORPORATION

Inventor： Yasuhito Kawai

IPC: B25B21/02 ,  B23Q11/12

CPC classification number: B23Q11/122 ,  B25B21/026

Abstract: An impact driver includes a motor, a spindle, a hammer externally and coaxially mounted on the spindle to receive rotation of the spindle and move relative to the spindle in an axial direction, an anvil in front of the hammer and coaxial with the spindle to be struck by the hammer in a rotation direction, and a hammer case accommodating the spindle, the hammer, and the anvil, allowing a front end of the anvil to protrude frontward from the hammer case, and filled with grease. The spindle includes a grease supply path located in the spindle and open in a sliding surface of the spindle on which the hammer slides to allow grease to be supplied to the sliding surface, and an accelerator in the spindle to accelerate a flow of the grease onto the sliding surface along the grease supply path in response to rotation of the motor.

公开(公告)号：US11660681B2

公开(公告)日：2023-05-30

申请号：US16934296

申请日：2020-07-21

Applicant: MAKITA CORPORATION

Inventor： Yasuhito Kawai ,  Tomoyuki Kondo

IPC: B23B31/107 ,  B25B21/02 ,  B25D16/00

CPC classification number: B23B31/1071 ,  B25B21/02 ,  B25D16/00

Abstract: A tool-holding apparatus (70) includes an engaging member (71) for engaging a tool accessory (B) and being movably supported in axial and radial directions in a rotational-output shaft (26) having an insertion hole (81) for holding the tool accessory (B). A first biasing member (72) biases the engaging member towards engagement with the engaging member. A bit sleeve (73) is movable in the axial direction along an outer-circumferential surface of the rotational-output shaft between a blocking position at which radial outward movement of the engaging member is blocked and a permitting position at which radial outward movement of the engaging member is permitted. A second biasing member (74) biases the bit sleeve toward the blocking position. A positioning part (75) is fixed on the outer-circumferential surface of the rotational-output shaft and stops the bit sleeve at the blocking position. The bit sleeve has a projection (88), which is disposed on the forward side of the first biasing member, extends inward in the radial direction, and slidably contacts the rotational-output shaft.

公开(公告)号：US11235453B2

公开(公告)日：2022-02-01

申请号：US16052747

申请日：2018-08-02

Applicant: MAKITA CORPORATION

Inventor： Yoshitaka Ichikawa ,  Goshi Ishikawa ,  Shinichi Hira ,  Yasuhito Kawai ,  Masahiro Watanabe ,  Takuya Kusakawa

IPC: B25F5/00 ,  B25B21/00 ,  H02P6/08 ,  B25B23/147 ,  H02P29/40 ,  B25B21/02 ,  H02P27/04

Abstract: An electric working machine in one aspect of the present disclosure includes a motor, a controller, and a setter. The controller is configured to change a rotational state of the motor, in response to an establishment of a condition for change after the motor is initiated, from a low speed rotation to a high speed rotation. The setter is configured to set, based on a situation in the motor in the low speed rotation, a control variable of the motor in the high speed rotation and/or the condition for change.

公开(公告)号：US10906163B2

公开(公告)日：2021-02-02

申请号：US16654461

申请日：2019-10-16

Applicant: MAKITA CORPORATION

Inventor： Hidenori Nagasaka ,  Ryunosuke Kumagai ,  Koji Tsukamoto ,  Tomonori Kawase ,  Kosuke Ito ,  Tokuo Hirabayashi ,  Yasuhito Kawai

IPC: B25B23/00 ,  B25B23/147 ,  H02K7/14 ,  B25F5/02 ,  H02K11/33 ,  B25B21/02 ,  H01H13/02 ,  H01H13/08

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.

公开(公告)号：US10478950B2

公开(公告)日：2019-11-19

申请号：US15356862

申请日：2016-11-21

Applicant: MAKITA CORPORATION

Inventor： Hidenori Nagasaka ,  Ryunosuke Kumagai ,  Koji Tsukamoto ,  Tomonori Kawase ,  Kosuke Ito ,  Tokuo Hirabayashi ,  Yasuhito Kawai

IPC: B25B23/147 ,  H02K11/33 ,  B25B21/02 ,  H01H13/02 ,  H01H13/08 ,  B25F5/02 ,  B25B23/00 ,  H02K7/14

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.

公开(公告)号：US12090608B2

公开(公告)日：2024-09-17

申请号：US18299277

申请日：2023-04-12

Applicant: MAKITA CORPORATION

Inventor： Yasuhito Kawai

IPC: B25B21/02

CPC classification number: B25B21/02

Abstract: An impact tool includes a motor; a spindle that is rotated by rotational force of the motor; a tool holding shaft at least a part of which is disposed forward of the spindle; a hammer that is supported by the spindle and impacts the tool holding shaft in a rotation direction without being displaced in the axial direction; a hammer case that houses the hammer; and a hammer bearing that is held by the hammer case and supports the hammer in a rotatable manner.

公开(公告)号：US11858094B2

公开(公告)日：2024-01-02

申请号：US17548703

申请日：2021-12-13

Applicant: MAKITA CORPORATION

Inventor： Yasuhito Kawai

IPC: B25B21/02

CPC classification number: B25B21/02

Abstract: Durability deterioration caused by a shock load is effectively reduced. An impact driver includes a motor, a carrier including a reduction assembly and rotatable by the motor, a shaft that receives rotation of the carrier and is rotatable relative to the carrier in an overloaded state, a hammer held by the shaft, and an anvil that is struck by the hammer in a rotation direction.

公开(公告)号：US11701759B2

公开(公告)日：2023-07-18

申请号：US17026390

申请日：2020-09-21

Applicant: MAKITA CORPORATION

Inventor： Itsuku Kato ,  Yasuhito Kawai

IPC: B25B21/02 ,  B25B23/147 ,  B25B23/14 ,  B25F5/00

CPC classification number: B25B21/02 ,  B25B23/1475 ,  B25B23/1405 ,  B25D2250/221 ,  B25F5/001

Abstract: An electric power tool in one aspect of the present disclosure includes a motor, an impact mechanism, and a control circuit. The control circuit executes a motor control process. The motor control process includes limiting an output of the motor in response to establishment of a preset condition. The preset condition is based on a load applied to the motor.

公开(公告)号：US12172280B2

公开(公告)日：2024-12-24

申请号：US18136362

申请日：2023-04-19

Applicant: MAKITA CORPORATION

Inventor： Yasuhito Kawai ,  Tomoyuki Kondo

IPC: B25D16/00 ,  B25B21/02 ,  B25D17/06 ,  B25D17/08 ,  B23B31/107

Abstract: A tool-holding apparatus (70) includes an engaging member (71) for engaging a tool accessory (B) and being movably supported in axial and radial directions in a rotational-output shaft (26) having an insertion hole (81) for holding the tool accessory (B). A first biasing member (72) biases the engaging member towards engagement with the engaging member. A bit sleeve (73) is movable in the axial direction along an outer-circumferential surface of the rotational-output shaft between a blocking position at which radial outward movement of the engaging member is blocked and a permitting position at which radial outward movement of the engaging member is permitted. A second biasing member (74) biases the bit sleeve toward the blocking position. A positioning part (75) is fixed on the outer-circumferential surface of the rotational-output shaft and stops the bit sleeve at the blocking position. The bit sleeve has a projection (88), which is disposed on the forward side of the first biasing member, extends inward in the radial direction, and slidably contacts the rotational-output shaft.